AW36515
Oct. 2019 V1.1
High Efficiency, Dual Independent 2A Flash LED Driver
Features
General Description
Dual Independent and Programmable 2A LED
Current Source
Flash：3.91mA~2.0A，256 levels
7.83mA/level
Torch： 0.98mA~500mA，256 levels
1.96mA/level
Flash Timeout：40ms~1.6s，16 levels
Flash/Torch/IR Mode
The AW36515 is a dual LED flash driver that
provides a high level of adjustability within a small
solution size. The AW36515 utilizes a 2MHz or
4MHz
fixed-frequency
synchronous
boost
converter to provide power to the dual 2A constant
current LED sources. The dual 256 levels current
sources provide the flexibility to adjust the current
of LED1 and LED2 in Flash/Torch/IR modes. The
AW36515 provides IVFM protection to prevent
system reset or shutdown under low battery
condition.
Up to 85% Flash Efficiency
Optimized Flash LED Current During Low Battery
Conditions (IVFM)
Hardware Flash/Torch Enable (STROBE/TORCH)
The AW36515 are controlled via an I2C compatible interface. The main features of the
AW36515 include: flash/torch current, flash timeout
duration, IVFM and TX interrupt. The AW36515
also
provides
hardware
flash/torch
pin
(STROBE/TORCH) to control Flash/Torch events.
Synchronization Input for RF Power Amplifier
Pulse Events (TX)
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400kHz I2C：AW36515 (I2C Address=0x63)
0.4mm Pitch，FCQFN-10L Package
Compatible with AW3643, AW3644, AW36413
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The 2MHz or 4MHz switching frequency options,
overvoltage protection (OVP), and adjustable
current limit allow for the use of tiny, low-profile
inductors and 10-µF ceramic capacitors. The
device operates over a –40°C to +85°C ambient
temperature range.
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Application
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Smartphone Camera Flash
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The AW36515 is available in small 0.4mm pitch
FCQFN 1.6mm×1.2mm -10L package.
Typical Application Circuit
A
L 1μH 3A
VIN
CIN
10μF
IN
SW
OUT
COUT
10μF
AW36515FCR
LED1
STROBE/TORCH
TX
SDA
SCL
MCU
Flash
LED
D1
LED2
GND
Flash
LED
D2
Typical Application Circuit of AW36515
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Pin Configuration And Top Mark
AW36515FCR Pin Configuration
(Top View)
A
GND
B
SW
SCL
C
OUT
STROBE/
TORCH
D
LED2
TX
LED1
1
2
3
IN
AW36515FCR Top Mark
(Top View)
SDA
VSDS
XXX
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VSDS – AW36515FCR
XXX – Production Tracing Code
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Pin Configuration and Top Mark
Pin Definition
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No.
C
NAME
TYPE
GND
Ground
Ground
IN
Power
Input voltage connection. Connect IN to GND with a 10µF or larger
ceramic capacitor.
A
SDA
I/O
Serial data input/output of the I2C interface.
SW
Power
Switch pin of the step-up DC-DC convertor.
B3
SCL
I/O
C1
OUT
Power
Step-up DC-DC converter output. Connect a 10µF ceramic
capacitor between OUT and GND.
C3
STROBE/TORCH
I/O
Active high hardware flash/torch/IR enable. Drive STROBE/TORCH
high to turn on Flash/Torch/IR pulse. Internal pull down resistor of
300kΩ between STROBE/TORCH and GND.
D1
LED2
Power
D2
TX
I/O
D3
LED1
Power
A1
A2
A3
B1
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DESCRIPTION
Serial clock input of the I2C interface.
High-side current source output for flash LED2.
Power amplifier synchronization input. Internal pull down resistor of
300kΩ between TX and GND.
High-side current source output for flash LED1.
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Ordering Information
Part Number
Temperature
Package
Marking
Moisture
Sensitivity
Level
Environmental
Information
Delivery
Form
AW36515FCR
-40°C~85°C
FCQFN
1.6mmX1.2mm
-10L
VSDS
MSL1
ROHS+HF
3000 units/
Tape and Reel
AWINIC Flash LED Driver Series
Channels
Type
Description
AW36515
2
Boost
High Efficiency, Dual Independent 2A Flash LED Driver
FCQFN-10L
AW3644
2
Boost
High Efficiency, Dual Independent 1.5A Flash LED
Driver
CSP-12B
AW3643
2
Boost
High Efficiency, Dual 1.5A Flash LED Driver
CSP-12B
AW36413
2
Boost
High Efficiency, Dual 1.5A Flash LED Driver
AW3648
1
Boost
High Efficiency, 1.5A Flash LED Driver
AW3642
1
Boost
High Efficiency, 1.5A Flash LED Driver
CSP-9B
AW3641E
1
Charge
Pump
Flash Current & Flash Timer Programmable 1A Flash
LED Driver
DFN-10L
AW36402
1
Current
Sink
200mA 1-wire Configurable Front Flash LED Driver
with Ultra Small Package
DFN-6L
AW36404
1
Current
Sink
400mA 1-wire Configurable Front Flash LED Driver
with Ultra Small Package
DFN-8L
AW36406
1
Current
Sink
600mA PWM Configurable Front Flash LED Driver
with Ultra Small Package
DFN-8L
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Package
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Product
CSP-12B
CSP-12B
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Typical Application Circuits
L 1μH 3A
VIN
CIN
10μF
IN
SW
OUT
COUT
10μF
AW36515FCR
LED1
STROBE/TORCH
TX
SDA
SCL
MCU
Flash
LED
D1
LED2
GND
Flash
LED
D2
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AW36515 Application Circuit
Notice for Typical Application Circuits:
1: Please place CIN，COUT as close to the chip as possible.
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2: Connect the inductor on the top layer close to the SW pin.
3: For the sake of driving capability, the power lines, output lines, and the connection lines of L and LED
should be short and wide as possible.
4:
n
Traces carry high current are marked in red in the above figure.
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Absolute Maximum Ratings(NOTE1)
PARAMETERS
Range
Unit
-0.3 to 6
V
SCL, SDA, STROBE/TORCH, TX
−0.3 to (VIN+0.3)
V
Continuous power dissipation
Internally limited
IN, SW, OUT, LED1, LED2
Max Junction Temperature TJMAX
155
°C
-65 to 150
°C
Maximum lead temperature (soldering)
260
°C
Junction to Ambient Thermal Resistance θJA
92
°C /W
HBM
±2000
V
CDM
±1500
Storage Temperature TSTG
ESD, All Pins(NOTE2)
-IT： -200
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VIN
Junction temperature (TJ)
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Ambient temperature (TA)
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PARAMETERS
C
mA
e
Recommended Operating Conditions
Range
Unit
2.7 to 5.5
V
-40 to 125
°C
-40 to 85
°C
NOTE1: Conditions out of those ranges listed in "absolute maximum ratings" may cause permanent damages
to the device. In spite of the limits above, functional operation conditions of the device should within the
ranges listed in "recommended operating conditions". Exposure to absolute-maximum-rated conditions for
prolonged periods may affect device reliability.
A
NOTE2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Test
method: ANSI/ESDA/JEDEC JS-001. CDM test method: JEDEC22-C101E.
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+IT：+200
Latch-Up (Test method: JEDEC STANDARD NO.78D)
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Electrical Characteristics
Typical values tested at TA=25°C. Minimum and maximum limits apply over the full operating ambient
temperature range(-40°C≤TA≤85°C). Unless otherwise specified, VIN=3.6V.
Symbol
Description
Test Condition
Min
Typ
Max
Unit
5.5
V
0.4
0.8
mA
3
10
A
Vin Supply
VIN
Input operating range
2.7
IQ
Quiescent supply current
Device not switching, pass mode
ISB
Standby supply current
Device disabled,
2.7V≤VIN≤5.5V,SCL=SDA=0V
UVLO
Under voltage lockout
threshold
Falling VIN
2.5
Rising VIN
2.6
ILED1/2
VOUT over-voltage protect
threshold
VOVP
Boost Converter Specifications
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RPMOS
RNMOS
ICL
A
FSW
VIVFM
PMOS switch on-resistance
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ON threshold
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OFF threshold
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249
10%
mA
4.85
5
5.15
4.75
4.9
5.05
-10%
NMOS switch on-resistance
2.0
V
7%
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Current source accuracy
VOUT=4V,
torch code=0x7F=249mA
-7%
V
90
mΩ
70
mΩ
Reg 0x07, bit[0]=0
-12%
1.9
12%
Reg 0x07, bit[0]=1
-12%
2.8
12%
Reg 0x07, bit[1]=0
-6%
2
6%
Reg 0x07, bit[1]=1
-6%
4
6%
Reg 0x02, bits[5:3]=”000”
-3%
2.9
3%
Switch current limit
A
Switching frequency
Input voltage flash monitor
trip threshold
MHz
Thermal shutdown threshold
155
Thermal shutdown hysteresis
20
TSD
V
°C
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Current Source Specifications
VOUT=4V,
flash code=0xFF=2.0A
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Electrical Characteristics(continued)
Typical values tested at TA=25°C. Minimum and maximum limits apply over the full operating ambient
temperature range(-40°C≤TA≤85°C). Unless otherwise specified, VIN=3.6V.
Symbol
Description
Test Condition
Min
Typ
Max
Unit
I2C-Compatible Interface Specifications(SCL,SDA)
VIL
Input logic low
0
0.4
V
VIH
Input logic high
1.2
VIN
V
VOL
Output logic low
0.4
V
0.4
V
ILOAD=3mA
STROBE/TORCH, TX Voltage Specifications
VIL
Input logic low
0
VIH
Input logic high
1.2
RPD
Internal pull down resistors
300
V
kΩ
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VIN
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
I2C Interface Timing
Symbol
Min
Description
FSCL
Interface Clock frequency
TDEGLITCH
Deglitch time
Typ
Max
Units
400
kHz
SCL
200
ns
SDA
250
ns
THD:STA
(Repeat-start) Start condition hold time
0.6
s
TLOW
Low level width of SCL
1.3
s
THIGH
High level width of SCL
0.6
s
TSU:STA
(Repeat-start) Start condition setup time
0.6
THD:DAT
Data hold time
0
TSU:DAT
Data setup time
0.1
TR
Rising time of SDA and SCL
TF
Falling time of SDA and SCL
TSU:STO
Stop condition setup time
TBUF
Time between start and stop condition
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SDA
tBUF
tLOW
tR
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tHIGH
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s
0.3
s
0.3
s
0.6
s
1.3
s
VIH
VIL
tSP
tF
VIH
SCL
Stop
A
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Start
tHD:STA
VIL
tHD:DAT
tSU:DAT
tSU:STA
Start
tSU:STO
Stop
I2C INTERFACE TIMING
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Typical Characteristics
2.2
2.2
2
2
1.8
1.8
1.6
1.6
1.4
1.4
ILED2 (A)
ILED1 (A)
Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise
noted .
1.2
1
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
0.52
0.48
0.44
0.4
0.36
0.32
0.28
0.24
0.2
0.16
0.12
0.08
0.04
0
32
64
96
128
160
224
256
0
32
64
96
128
192
224
LED2 Flash Code (dec#)
LED1 Flash Current vs Brightness Code
LED2 Flash Current vs Brightness Code
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32
64
96
128
160
192
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224
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256
0
32
64
96
128
160
192
224
LED1 Torch Code (dec#)
LED2 Torch Code (dec#)
LED1 Torch Current vs Brightness Code
LED2 Torch Current vs Brightness Code
A
256
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0.52
0.48
0.44
0.4
0.36
0.32
0.28
0.24
0.2
0.16
0.12
0.08
0.04
0
2.1
BRC=0
256
BRC=127
2
BRC=31
1.9
BRC=159
BRC=47
0.7
1.8
BRC=175
BRC=63
BRC=191
0.6
BRC=79
1.7
1.6
BRC=207
0.5
BRC=111
0.8
ILED1 (A)
BRC=15
0.9
BRC=95
0.4
BRC=143
BRC=223
1.5
BRC=239
1.4
BRC=255
1.3
0.3
1.2
0.2
1.1
0.1
1
0
2.5
3
3.5
4
4.5
5
5.5
0.9
2.5
3
3.5
4
4.5
5
VIN(V)
VIN(V)
LED1 Flash Current vs Input Voltage
LED1 Flash Current vs Input Voltage
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160
LED1 Flash Code (dec#)
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1
192
ILED2 (A)
0
ILED1 (A)
1
0.8
0
ILED1 (A)
1.2
5.5
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Typical Characteristics (continued)
Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise
noted .
1
BRC=31
1.9
BRC=159
BRC=47
0.7
1.8
BRC=175
BRC=63
BRC=191
0.6
BRC=79
1.7
1.6
BRC=207
0.5
BRC=111
ILED2 (A)
2
0.8
BRC=95
0.4
BRC=143
BRC=223
1.5
BRC=239
1.4
BRC=255
1.3
0.3
1.2
0.2
1.1
0.1
1
0
2.5
3
3.5
4
4.5
5
0.9
5.5
2.5
1.60
1.56
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ILED (A)
1.70
1.50
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3.5
4
4.5
VIN (V)
fSW=2MHz
ILED=2.0A
C
5
1.52
1.50
1.48
1.46
1.42
1.40
2.5
LED1
LED2
ILED (A)
ILED (A)
0.79
0.77
0.75
0.73
0.71
0.69
0.67
3.5
ILED=0.747A
4
VIN (V)
fSW=2MHz
4.5
5
Flash
LED1 & LED2 Current vs Input Voltage
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4
4.5
VIN (V)
fSW=2MHz
5
5.5
Flash
LED1/2 Flash Current vs Input Voltage
0.81
3
3.5
ILED=1.5A
LED1/2 Flash Current vs Input Voltage
2.5
3
Flash
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1.44
5.5
5.5
1.12
1.08
1.04
1.00
0.96
0.92
0.88
0.84
0.80
0.76
0.72
0.68
0.64
0.60
LED1
LED2
2.5
3
3.5
ILED=1.006A
4
VIN (V)
fSW=2MHz
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1.60
2.5
5
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1.58
1.40
4.5
LED2 Flash Current vs Input Voltage
1.80
0.83
4
LED2 Flash Current vs Input Voltage
1.90
0.85
3.5
VIN(V)
2.00
0.87
3
VIN(V)
2.10
ILED (A)
BRC=127
BRC=15
0.9
ILED2 (A)
2.1
BRC=0
4.5
5
5.5
Flash
LED1 & LED2 Current vs Input Voltage
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Typical Characteristics (continued)
0.55
0.55
0.54
0.54
0.53
0.53
0.52
0.52
0.51
0.51
ILED (A)
ILED (A)
Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise
noted .
0.5
0.49
0.5
0.49
0.48
0.48
0.47
0.47
0.46
0.46
0.45
0.45
2.5
3
3.5
ILED=0.5A
4
4.5
VIN(V)
fsw=2MHz
5
2.5
5.5
3
0.3
0.29
0.28
0.28
0.27
0.27
0.26
0.26
ILED (A)
ILED (A)
0.3
0.29
0.25
0.24
0.22
3
3.5
4
4.5
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VIN(V)
fsw=2MHz
Torch
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5.5
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0.25
0.24
0.23
0.22
0.21
0.2
2.5
3
3.5
ILED=0.25A
4
4.5
VIN(V)
fsw=4MHz
5
5.5
Torch
LED1/2 Torch Current vs Input Voltage
LED1
LED1
0.29
LED2
LED2
0.28
0.52
0.27
0.51
0.26
ILED1 (A)
ILED (A)
0.53
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Torch
0.3
A
0.54
5.5
e
LED1/2 Torch Current vs Input Voltage
0.55
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0.23
2.5
4.5
LED1/2 Torch Current vs Input Voltage
LED1/2 Torch Current vs Input Voltage
0.2
4
VIN(V)
fsw=4MHz
ILED=0.5A
Torch
0.21
3.5
0.5
0.49
0.25
0.24
0.48
0.23
0.47
0.22
0.46
0.21
0.2
0.45
2.5
3
3.5
ILED=0.5A
4
VIN (V)
fsw=2MHz
4.5
5
2.5
3
3.5
ILED=0.25A
Torch
LED1&2 Torch Current vs Input Voltage
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5.5
11
4
VIN(V)
fsw=2MHz
4.5
5
5.5
Torch
LED1&2 Torch Current vs Input Voltage
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Typical Characteristics (continued)
Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise
noted .
100
100
VLED=3.3V
95
VLED=3.5V
VLED=3.6V
90
90
VLED=3.7V
85
VLED=4.1V
80
ηLED (%)
ηLED (%)
VLED=3.8V
VLED=4.4V
70
80
75
70
65
60
60
55
50
50
2.5
3
3.5
4
4.5
5
2.5
5.5
3.0
3.5
VIN (V)
ILED=2.0A
fSW=2MHz
Flash
ILED=2.0A
100
95
95
90
90
85
85
80
75
o
70
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50
2.5
3.0
ILED=1.5A
3.5
4.0
4.5
VIN (V)
VLED=3.5V
fSW=2MHz
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5.0
75
70
65
60
55
50
5.5
2.5
Flash
3.0
ILED=1.5A
3.5
4.0
4.5
VIN (V)
VLED=3.5V
fSW=4MHz
5.0
5.5
Flash
LED Efficiency vs Input Voltage
A
100
95
95
90
90
85
85
80
80
ηLED (%)
ηLED (%)
VIN (V)
VLED=3.6V
fSW=2MHz
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80
75
70
75
70
65
65
60
60
55
55
50
50
2.5
3.0
ILED=0.5A
3.5
4.0
4.5
5.0
VIN (V)
VLED=3.1V
fSW=2MHz
Torch
LED Efficiency vs Input Voltage
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5.5
2.5
3.0
ILED=0.25A
3.5
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5.5
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LED Efficiency vs Input Voltage
100
5.0
n
ηLED (%)
ηLED (%)
100
60
4.5
LED Efficiency vs Input Voltage
LED Efficiency vs Input Voltage
65
4.0
4.0
4.5
5.0
VIN (V)
VLED=3.0V
fSW=2MHz
5.5
Torch
LED Efficiency vs Input Voltage
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Typical Characteristics (continued)
2.150
4.300
2.125
4.250
2.100
4.200
2.075
4.150
2.050
4.100
fSW (Mhz)
fSW (Mhz)
Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise
noted .
2.025
2.000
4.000
1.975
3.950
1.950
3.900
1.925
3.850
1.900
2.5 2.75
3
3.25 3.5 3.75
4
4.25 4.5 4.75
3.800
5
2.5 2.75
6
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ISTB (μA)
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1.0
0.5
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3
3.5
4
4.5
C
5
5
e
5
1.5
4
3
2
1
0
5.5
2.5
3
3.5
4
4.5
5
VIN (V)
I2C=0V
VIN (V)
I2C=1.8V
Standby Current vs Input Voltage
Standby Current vs Input Voltage
A
5
4.25 4.5 4.75
4-MHz Frequency vs Input Voltage
2.5
5.5
3.0
2.5
4
ISTB (μA)
ISTB (μA)
2.0
3
2
1.5
1.0
1
0.5
0
0.0
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
VIN (V)
I2C=3.3V
VIN (V)
I2C=VIN
Standby Current vs Input Voltage
Standby Current vs Input Voltage
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2-MHz Frequency vs Input Voltage
7
2.5
3.25 3.5 3.75
VIN (V)
3.0
0.0
3
VIN (V)
2.0
ISTB (μA)
4.050
5.5
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Typical Characteristics (continued)
2.20
2.16
2.12
2.08
2.04
2.00
1.96
1.92
1.88
1.84
1.80
1.76
1.72
1.68
1.64
1.60
ICL (A)
ICL (A)
Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise
noted .
2.5
2.7
2.9
3.1
ILED=1.5A
3.3
3.5
3.7
3.9
VIN (V)
fSW=2MHz
ICL=1.9A
4.1
2.20
2.16
2.12
2.08
2.04
2.00
1.96
1.92
1.88
1.84
1.80
1.76
1.72
1.68
1.64
1.60
4.3
2.5
2.7
VLED=4.5V
2.8
2.8
2.6
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2.4
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2.8
3.1
ILED=2.0A
3.4
3.7
4
4.3
VIN (V)
fSW=2MHz
ICL=2.8A
4.6
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4.9
5.2
5.5
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2.6
VOUT(2V/DIV)
IIN(1A/DIV)
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VLED=4.5V
2.0
2.5
2.8
3.1
ILED=2.0A
3.4
3.7
4
4.3
VIN (V)
fSW=4MHz
ICL=2.8A
4.6
4.9
5.2
5.5
VLED=4.5V
Inductor Current Limit vs Input Voltage
VOUT(2V/DIV)
IIN(1A/DIV)
ILED(500mA/DIV)
ILED1/2=1.5A
fSW=2MHz
VLED=3.4V
Ramp Down
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4.3
TIME (500 μs/DIV)
VLED=3.4V
Ramp Up
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4.1
2.2
TIME (500 μs/DIV)
fSW=2MHz
3.9
2.4
VLED=4.5V
ILED(500mA/DIV)
ILED1/2=1.5A
3.7
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Inductor Current Limit vs Input Voltage
A
3.5
VIN (V)
fSW=4MHz
ICL=1.9A
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ICL (A)
ICL (A)
3.0
2.5
3.3
Inductor Current Limit vs Input Voltage
3.0
2.0
3.1
ILED=1.5A
Inductor Current Limit vs Input Voltage
2.2
2.9
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Typical Characteristics (continued)
Ambient temperature is 25°C, input voltage is 3.6 V, CIN = COUT = 2×10 µF and L=1 µH, unless otherwise
noted .
VIN (100mV/DIV)
TX signal
VOUT(2V/DIV)
IIN (500mA/DIV)
IIN(800mA/DIV)
ILED (200mA/DIV)
ILED(500mA/DIV)
ILED1=ILED2=747mA
fSW=2MHz
ILED1=ILED2=747mA
VLED=3.18V
fSW=2MHz
VLED=3.18V
VIVFM=2.9V
IVFM - Stop and Hold
TX Interrupt
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TIME (500 μs/DIV)
TIME (2 ms/DIV)
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Detailed Functional Description
The AW36515 is a high-power LED flash driver capable of delivering up to 2A in either of the two parallel
LEDs. The device incorporates a 2MHz or 4MHz constant frequency-synchronous current-mode PWM boost
converter and dual high-side current sources to regulate the LED current over the 2.7V to 5.5V input voltage
range.
The AW36515 PWM DC-DC boost converter switches and boosts the output to maintain at least VHR across
each of the current sources (LED1/2). This minimum headroom voltage ensures that both current sources
remain in regulation. If the input voltage is above the LED voltage + current source headroom voltage, the
device would not switch, but turn the PMOS on continuously (Pass mode). In Pass mode the difference
between (VIN − ILED × RPMOS) and the voltage across the LED is dropped across the current source.
The AW36515 has two logic inputs including a reusable hardware Flash/Torch Enable (STROBE/TORCH)
and a Flash Interrupt input (TX) designed to interrupt the flash pulse during high battery-current conditions.
These logic inputs have internal 300kΩ (typical) pull-down resistors to GND.
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Control is done via an I2C-compatible interface. This includes adjustment of the Flash and Torch current
levels, changing the Flash Timeout Duration, and changing the switch current limit. Additionally, there are flag
and status bits that indicate flash current timeout, LED over-temperature condition, LED failure (open/short),
device thermal shutdown, TX interrupt, and VIN under-voltage conditions.
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Functional Block Diagram
SW
AW36515
OVP
IN
Thermal Shutdown
Protection
UVLO
POR
VOVP
IVFM
OSC
2/4MHz
OUT
Boost Controller
Current
Limit
TX
SDA
SCL
Control Logic
/Regsiter
2
Features Description
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Power On Reset
LED2
IC
Interface
LED & OUT
Short Detect
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GND
When the supply voltage VIN drops below a predefined voltage VPOR (2.0V typical), the device generates a
reset signal to perform a power-on reset operation, which will reset all control circuits and configuration
registers.
Once VIN goes above around VPOR (2.0V typical), it should stay high for at least 2ms time before any I2C
command can be accepted.
A
Software Reset
By setting bit[7](Software Reset Bit) to a ‘1’ in the Boost Configuration Register(0x07) via I2C interface will
reset the AW36515 internal circuit and all configuration registers, after the soft reset command is input
through I2C, it needs to wait at least 2ms before any other I2C command can be accepted.
Flash Mode
In Flash Mode, the LED current sources (LED1/2) provide 256 target current levels from 3.91mA to 2A. The
Flash currents are adjusted via the LED1 and LED2 Flash Brightness Registers. Flash mode is activated by
the Enable Register(setting M1, M0 to '11'), or by pulling the STROBE/TORCH pin HIGH when bit[5] (Strobe
Enable Bit) is ‘1’ in the Enable Register(0x01). Once the Flash sequence is activated the current source
(LED1/2) ramps up to the programmed Flash current by stepping through all current steps until the
programmed current is reached.
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LED1
FB
Select
STROBE/TORCH
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
When the device is enabled in Flash Mode through the Enable Register, all mode bits in the Enable Register
are cleared after a flash timeout event.
Torch Mode
In Torch mode, the LED current sources (LED1/2) provide 256 target current levels from 0.98mA to 500mA on
AW36515. The Torch currents are adjusted via the LED1 and LED2 Torch Brightness Registers. Torch mode
is activated by the Enable Register (setting M1, M0 to '10'), or by pulling the STROBE/TORCH pin HIGH when
bit[5] (Torch Enable Bit) is ‘1’ in the Enable Register(0x01). Once the TORCH sequence is activated the active
current sources (LED1/2) ramps up to the programmed Torch current by stepping through all current steps
until the programmed current is reached. The rate at which the current ramps is determined by the value
chosen in the Timing Register.
AW36515 will execute flash operation when both bit[4] and bit[5] are ‘1’ in the Enable Register with pulling the
STROBE/TORCH pin HIGH.
Torch Mode is not affected by Flash Timeout or by a TX Interrupt event.
IR Mode
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BOOST
VOUT
PASS
OFF
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STROBE
ILED1
A
ILED2
M1,M0=‘01’
LED1,LED2=‘11’
STROBE EN=‘1’
M1,M0=‘01’
LED1,LED2=‘10’
STROBE EN=‘1’
M1,M0=‘00’
LED1,LED2=‘10’
STROBE EN=‘1’
IR Mode with Boost
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In IR Mode, Enable register bit[3:2] should be to ‘01’ (setting M1, M0 to '01') and the STROBE/TORCH pin
should be enabled(Strobe Enable Bit). The target LED current is equal to the value stored in the LED1/2 Flash
Brightness Registers. When IR mode is enabled, the boost converter turns on and set the output equal to the
input (pass-mode) . The STROBE/TORCH pin can only be set to be Level sensitive, meaning all timing of the
IR pulse is externally controlled, but it is still protected by flash time-out if STROBE width is too long. In IR
Mode, the current sources do not ramp the LED outputs to the target. LED1/2 is enabled to the full current
setting without delay or slow ramp during STROBE rising edge, and they are fully turned off immediately
without delay or slow ramp during STROBE falling edge
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
VOUT
STROBE
ILED1
ILED2
M1,M0=‘01’
LED1,LED2=‘11’
STROBE EN=‘1’
M1,M0=‘01’
LED1,LED2=‘10’
STROBE EN=‘1’
M1,M0=‘00’
LED1,LED2=‘10’
STROBE EN=‘1’
IR Mode Pass Only
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VOUT
STROBE
e
ILED1
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Flash Timeout Value
ILED2
M1,M0=‘01’
LED1,LED2=‘11’
STROBE EN=‘1’
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Timeout
Start
Timeout
Reset
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Timeout
Start
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Timeout
Reset
Timeout
Start
Timeout Reached
VOUT goes low，
LED1 &LED2 turn off
IR Mode Timeout
Soft Start-up
Turn on the AW36515 Torch and Flash modes can be done through the Enable Register. On start-up, when
VOUT is less than VIN the internal synchronous PMOS turns on as a current source and delivers 200mA (typical)
to the output capacitor. During this time the current source (LED) is off. When the voltage across the output
capacitor reaches 2.2 V (typical) the current source turns on. At turn-on the current source steps through each
FLASH or TORCH level until the target LED current is reached. This gives the device a controlled turn-on and
limits inrush current from the VIN supply.
A
Pass Mode
The AW36515 starts up in Pass Mode and stays there until Boost Mode is needed to maintain regulation. In
Pass Mode the boost converter does not switch, and the synchronous PMOS turns fully on bringing VOUT up to
VIN − ILED × RPMOS. In Pass Mode the inductor current is not limited by the peak current limit. If the voltage
difference between VOUT and VLED falls below VHR, the device switches to Boost Mode.
AW36515 can be forced into pass mode only state regardless the VHR, which must be set before system enter
Boost mode, once system enter Boost mode, the bit2 of Boost Configuration Register (0x07) is invalid unless
setting the device enter standby mode, or by setting the SW RESET bit to a '1', or by removing power to the
AW36515.
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Power Amplifier Synchronization (TX)
The TX pin is a Power Amplifier Synchronization input. This is designed to reduce the flash LED current and
thus limit the battery current during high battery current conditions such as PA transmit events. When the
AW36515 is engaged in a Flash event, and the TX pin is pulled high, the LED current is forced into Torch
Mode at the programmed Torch current setting. If the TX pin is then pulled low before the Flash pulse
terminates, the LED current returns to the previous Flash current level. At the end of the Flash time-out,
whether the TX pin is high or low, the LED current turns off.
The TX input can be disable by setting bit[7] (TX Enable) to a ‘0’ in the Enable Register(0x01).
Input Voltage Flash Monitor (IVFM)
The AW36515 has the ability to adjust the flash current based upon the voltage level present at the IN pin
utilizing the Input Voltage Flash Monitor (IVFM). The adjustable threshold ranges from 2.9 V to 3.6 V in
100mV steps as well as adjustable hysteresis, with Stop-and-Hold mode. The IVFM threshold and hysteresis
are controlled by bits[5:3] and bit[2] respectively, in the IVFM Register(0x02). The Flags2 Register has the
IVFM flag bit set when the input voltage crosses the IVFM threshold value. Additionally, the IVFM threshold
sets the input voltage boundary that forces the AW36515 to either stop ramping the flash current during
startup in Stop and Hold Mode.
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Stop and Hold Mode: Stops Current Ramp and holds the level for the remaining flash, If VIN falls below the
IVFM threshold value.
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Flash Event
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Stop & Hold
Mode
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Flash Current
T-Filter=4μs
IVFM-Threshold
C
Target Flash Current
Flash Current with
IVFM Disable
IVFM Mode
A
Flash Timeout
The Flash Timeout period sets the maximum time of one flash event, whether a flash stop command is
received or not. The AW36515 has 16 timeout levels ranging from 40ms to 1.6s (see TIMING
CONFIGURATION REGISTER (0X08) for more detail). Flash Timeout applies to both Flash and IR modes,
and it continues to count when the Flash mode is forced into Torch mode during a TX high event. The mode
bits are cleared and bit[0] is set in the Flags1 register(0x0A) upon a Flash Timeout. This fault flag can be reset
to '0' by reading back the Flags1 Register (0x0A), 'or by setting the SW RESET bit to a '1', or by removing
power to the AW36515.
Current Limit
When the inductor current limit is reached, the AW36515 terminates the charging phase of the switching cycle
until the next switching period. If the over-current condition persists, the device operates continuously in
current limit. The AW36515 features two selectable inductor current limits(1.9A and 2.8A) that are
programmable by bit[0] in Boost configuration Register(0x07).
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Since the current limit is sensed in the NMOS switch, there is no mechanism to limit the current when the
device operates in Pass Mode (current does not flow through the NMOS in pass mode). The mode bits are
not cleared upon a Current Limit event, but a flag bit[3] is set in the Flags1 register(0x0A).
This fault flag can be reset to '0' by reading back the Flags1 Register (0x0A), or by setting the SW RESET bit
to a '1', or by removing power to the AW36515.
Undervoltage Lockout (UVLO)
The AW36515 has an internal comparator that monitors the voltage at IN and forces the AW36515 into
standby if the input voltage drops to 2.5 V. If the UVLO monitor threshold is tripped, the UVLO flag bit is set in
the Flags1 Register (0x0A). If the input voltage rises above 2.5 V, the AW36515 is not available for operation
until there is an I2C read of the Flags1 Register (0x0A). Upon a read, the Flags1 register is cleared, and
normal operation can resume if the input voltage is greater than 2.5 V.
VOUT Short Fault
The Output Short Fault flag reads back a '1' if the device is active in Flash or Torch mode and the boost output
experiences a short condition. VOUT short condition occurs if the voltage at OUT goes below 2.3V (typ.) while
the device is in Torch or Flash mode. There is a deglitch time of 2.048ms before the VOUT Short flag is valid.
The mode bits are cleared upon an the VOUT short fault. The AW36515 is not available for operation until
VOUT Fault flags is cleared. The VOUT Short Fault can be reset to '0' by reading back the Flags1 Register
(0x0A), or by setting the SW RESET bit to a '1', or by removing power to the AW36515.
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LED Short Fault
The LED Short Fault flags read back a '1' if the device is active in Flash or Torch mode and either active LED
output experiences a short condition. An LED short condition is determined if the voltage at LED1 or LED2
goes below 500mV (typ.) while the device is in Torch or Flash mode. There is a deglitch time of 256μs before
the LED Short Fault flag is valid. The mode bits are cleared upon an LED Short Fault. The AW36515 is not
available for operation until the LED Short Fault flags is cleared. The LED Short Faults can be reset to '0' by
reading back the Flags1 Register (0x0A), or by setting the SW RESET bit to a '1', or by removing power to the
AW36515.
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Overvoltage Protection (OVP)
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The output voltage is limited to typically 5 V. In situations such as an open LED, the AW36515 raises the
output voltage in order to try and keep the LED current at its target value. When VOUT reaches 5 V (typ.) the
overvoltage comparator trips and turns off the internal NMOS. When VOUT falls below the “VOVP Off
Threshold”, the AW36515 begins switching again. The mode bits are cleared, and the OVP Fault flag is set,
when an OVP condition is present for three rising OVP edges. This prevents momentary OVP events from
forcing the device to shut down. The AW36515 is not available for operation until the OVP Fault flag is cleared.
The OVP Fault can be reset to '0' by reading back the Flags2 Register (0x0A), or by setting the SW RESET bit
to a '1', or by removing power to the AW36515.
A
Thermal Shutdown (TSD)
When the AW36515 die temperature reaches 155°C, the thermal shutdown detection circuit trips, forcing the
AW36515 enter standby mode and writing a '1' to the Thermal Shutdown Fault flag of the Flags1 Register
(0x0A) . The AW36515 is only allowed to restart after the Thermal Shutdown Fault flag is cleared. The
Thermal Shutdown Faults can be reset to '0' by reading back the Flags1 Register (0x0A), or by setting the SW
RESET bit to a '1', or by removing power to the AW36515. Upon restart, if the die temperature is still above
155°C, the AW36515 resets the Fault flag and re-enters standby mode.
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Programming
Control Truth Table
MODE1
MODE0
STROBE EN
TORCH EN
STROBE/TORCH PIN
ACTION
0
0
0
0
X
Standby
0
0
0
1
Pos edge
Ext Torch
0
0
1
0
Pos edge
Ext Flash
0
0
1
1
Pos edge
Ext Flash
1
0
X
X
X
Int Torch
1
1
X
X
X
Int Flash
0
1
0
X
X
IRLED Standby
0
1
1
X
0
IRLED Standby
0
1
1
X
Pos edge
I2C Interface
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Data Validation
When SCL is high level, SDA level must be constant. SDA can be changed only when SCL is low level.
SCL
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Data Line
Stable
Data Valid
Change
of Data
Allowed
Data Validation Diagram
I2C Start/Stop
A
I2C start: SDA changes from high level to low level when SCL is high level.
I2C stop: SDA changes from low level to high level when SCL is high level.
SDA
SCL
S/Sr
P
S: START condition
Sr: START Repeated condition
P: STOP condition
Start and Stop Conditions
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IRLED Enabled
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
ACK (Acknowledgement)
ACK means the successful transfer of I2C bus data. After master sends an 8-bit data, SDA must be released;
SDA is pulled to GND by slave device when slave acknowledges.
When master reads, slave device sends 8-bit data, releases the SDA and waits for ACK from master. If ACK is
sent and I2C stop is not sent by master, slave device sends the next data. If ACK is not send by master, slave
device stops to send data and waits for I2C stop.
Data Output
by Transmiter
Not Acknowledge（NACK）
Data Output
by Receiver
Acknowledge（ACK）
2
1
SCL From
Master
8
9
Clock Pulse for
Acknowledgement
START
condition
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I2C ACK Timing
Write Cycle
One data bit is transferred during each clock pulse. Data is sampled during the high state of the serial clock
(SCL). Consequently, throughout the clock’s high period, the data should remain stable. Any changes on the
SDA line during the high state of the SCL and in the middle of a transaction, aborts the current transaction.
New data should be sent during the low SCL state. This protocol allows a single data line to transfer both
command/control information and data using the synchronous serial clock.
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Each data transaction is composed of a Start Condition, a number of byte transfers (set by the software) and
a Stop Condition to terminate the transaction. Every byte written to the SDA bus must be 8 bits long and is
transferred with the most significant bit first. After each byte, an Acknowledge signal must follow.
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In a write process, the following steps should be followed:
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a)
Master device generates START condition. The “START” signal is generated by lowering the
SDA signal while the SCL signal is high.
b)
c)
A
d)
Master device sends slave address (7-bit) and the data direction bit (R/W = 0).
Slave device sends acknowledge signal if the slave address is correct.
Master sends control register address (8-bit)
e)
Slave sends acknowledge signal
f)
Master sends data byte to be written to the addressed register
g)
Slave sends acknowledge signal
h)
If master will send further data bytes the control register address will be incremented by one after
acknowledge signal (repeat step f and g)
i)
Master generates STOP condition to indicate write cycle end
SCL
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
A6 A5 A4 A3 A2 A1 A0 R/WAck A7 A6 A5 A4 A3 A2 A1 A0 Ack D7 D6 D5 D4 D3 D2 D1 D0 Ack
SDA
Start
Device Address
Register Address
Write Data
Stop
I2C Write Timing
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Read Cycle
In a read cycle, the following steps should be followed:
a)
Master device generates START condition.
b)
Master device sends slave address (7-bit) and the data direction bit (R/W = 0).
c)
Slave device sends acknowledge signal if the slave address is correct.
d)
Master sends control register address (8-bit).
e)
Slave sends acknowledge signal.
f)
Master generates STOP condition followed with START condition or REPEAT START condition.
g)
Master device sends slave address (7-bit) and the data direction bit (R/W = 1).
h)
Slave device sends acknowledge signal if the slave address is correct.
i)
Slave sends data byte from addressed register.
j)
If the master device sends acknowledge signal, the slave device will increase the control register
address by one, then send the next data from the new addressed register.
k)
If the master device generates STOP condition, the read cycle is ended.
SCL
0
1
2
3
4
5
SDA
A6
A5
A4
A3
A2
A1
start
7
8
0
1
A0 R/W Ack A7
A6
Device Address
……
Using
Repeat start……
1
2
3
4
A6
A5
A4
A3
A2
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Separated
Read/write
transaction ……
P
S
3
4
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5
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5
A1
C
6
7
8
0
A0 R/W Ack D7
A5
A4
A3
A2
6
7
A1
A0
0
1
2
3
4
5
A6
A5
A4
A3
A2
A1
6
1
...
6
D6 …… D1
7
8
Ack
8
D0 Ack
stop
Read Data
Device Address
7
8
0
A0 R/W Ack D7
Device Address
A
2
Register Address
0
RS
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1
...
6
7
D6 …… D1
D0
Read Data
8
Ack
stop
I2C Read Timing
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Register Configuration
Register List
Register name
Address(HEX)
Read/Write
Default Value
Chip ID Register
0x00
Read
0x30
Enable Register
0x01
Read/Write
0x80
IVFM Register
0x02
Read/Write
0x01
LED1 Flash Brightness Register
0x03
Read/Write
0x7F
LED2 Flash Brightness Register
0x04
Read/Write
0x7F
LED1 Torch Brightness Register
0x05
Read/Write
0x7F
LED2 Torch Brightness Register
0x06
Read/Write
0x7F
Boost Configuration Register
0x07
Read/Write
Timing Configuration Register
0x08
Read/Write
Flags1 Register
0x0A
Read
Flags2 Register
0x0B
Read
Device ID Register
0x0C
Read
Last Flash Register
0x0D
Read
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0x00
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0x00
0x02
0x00
Chip ID Register (0x00)
Bit 7
A
Chip ID:
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Register Detailed Description
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0x09
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
LED2 Enable
0=OFF
(Default)
1=ON
LED1 Enable
0=OFF
(Default)
1=ON
“00110000”
Enable Register (0x01)
Bit 7
TX Pin
Enable
0=Disabled
1=Enabled
(Default)
Bit 6
Strobe Type
0=Level
Triggered
(Default)
1=Edge
Triggered
Strobe
Enable
0=Disabled
(Default)
1=Enabled
Torch
Enable
0=Disabled
(Default)
1=Enabled
Mode Bits: M1, M0
00=Standby (Default)
01=IR Drive
10=Torch
11=Flash
Note:
In Edge or Level Strobe Mode, it is recommended that the trigger pulse width be set greater than 1ms to
ensure proper turn-on of the device.
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
IVFM Register (0x02)
Bit 7
RFU
Bit 6
UVLO
Circuitry
0=Disabled
(Default)
1=Enabled
Bit 5
Bit 4
Bit 3
IVFM Levels
000=2.9 V (Default)
001=3.0 V
010=3.1 V
011=3.2 V
100=3.3 V
101=3.4 V
110=3.5 V
111=3.6 V
Bit 2
RFU
Bit 1
RFU
Bit 0
IVFM Enable
0=Disabled
(Default)
1=Enabled
LED1 Flash Brightness Register (0x03)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
LED1 Flash Brightness Levels
IFLASH(mA)≈(Brightness Code*7.83mA)+3.91mA
00000000=3.91 mA
……………
01111111=998.32 mA
……………
11111111=2.0 A
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Bit 6
Bit 5
Bit 4
00000000=3.91 mA
……………
01111111=998.32 mA
……………
11111111=2.0 A
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Bit 2
Bit 1
Bit 0
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Bit 3
LED2 Flash Brightness Levels
IFLASH(mA)≈(Brightness Code*7.83mA)+3.91mA
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LED2 Flash Brightness Register (0x04)
Bit 7
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(Default)
LED1 Torch Brightness Register (0x05)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 3
Bit 2
Bit 1
Bit 0
LED1 Torch Brightness Levels
ITORCH(mA)≈(Brightness Code*1.96mA)+0.98mA
A
00000000=0.98 mA
……………
01111111=249.9 mA
……………
11111111=500 mA
(Default)
LED2 Torch Brightness Register (0x06)
Bit 7
Bit 6
Bit 5
Bit 4
LED2 Torch Brightness Levels
ITORCH(mA)≈(Brightness Code*1.96mA)+0.98mA
00000000=0.98 mA
……………
01111111=249.9 mA
……………
11111111=500 mA
(Default)
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Boost Configuration Register (0x07)
Bit 7
Bit 6
Software
Reset Bit
0=Not Reset
(Default)
1=Reset
RFU
Bit 6
RFU
RFU
Bit 3
Bit 5
Bit 4
Bit 6
VOUT Short
Fault
LED1 Short
Fault
Bit 2
Flash Time-out Duration
0000=40 ms
0001=80 ms
0010=120 ms
0011=160 ms
0100=200 ms
0101=240 ms
0110=280 ms
0111=320 ms
1000=360 ms
1001=400 ms
1010=600 ms (Default)
1011=800 ms
1100=1000 ms
1101=1200 ms
1110=1400 ms
1111=1600 ms
Bit 5
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RFU
Boost
Current Limit
0=1.9A
1=2.8A
(Default)
C
LED2 Short
Fault
Bit 3
Current Limit
Flag
Bit 1
Bit 2
Thermal
Shutdown
(TSD) Fault
Bit 0
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Bit 4
Bit 6
RFU
Bit 5
RFU
Bit 4
RFU
Bit 3
RFU
Bit 2
IVFM Trip
Flag
A
Bit 1
UVLO Fault
Bit 0
Flash
Time-Out
Flag
Bit 1
OVP Fault
Bit 0
RFU
Device ID Register (0x0C)
Bit 7
RFU
Bit 6
RFU
Bit 5
RFU
Bit 4
Bit 3
Device ID
“00”
Bit 2
Bit 1
Bit 0
Silicon Revision Bits
“010”
Last Flash Register (0x0D)
Bit 7
RFU
Boost
Frequency
Select
0=2 MHz
(Default)
1=4 MHz
Bit 0
Flags2 Register (0x0B)
Bit 7
Bit 1
Boost Mode
0=Normal
(Default)
1=Pass Mode
Only
Bit 3
Flags1 Register (0x0A)
TX Flag
Bit 2
LED Pin
Short Fault
Detect
0=Disabled
1=Enabled
(Default)
Torch Current Ramp time
000=No Ramp
001=1 ms (Default)
010=32 ms
011=64 ms
100=128 ms
101=256 ms
110=512 ms
111=1024 ms
Bit 7
RFU
Bit 4
Timing Configuration Register (0x08)
Bit 7
Bit 5
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
The value stored is always the last current value the IVFM detection block set ILED=IFLASH-TARGET*((code+1)/256)
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Application Information
The AW36515 can drive two flash LEDs at currents up to 2 A per LED. The 2MHz/4MHz DC-DC boost
regulator allows for the use of small value discrete external components. Below are some peripheral selection
guidelines.
Output Capacitor Selection
The AW36515 is designed to operate with a 10µF ceramic output capacitor. When the boost converter is
running, the output capacitor supplies the load current during the boost converter on-time. When the NMOS
switch turns off, the inductor energy is discharged through the internal PMOS switch, supplying power to the
load and restoring charge to the output capacitor. This causes a sag in the output voltage during the on-time
and a rise in the output voltage during the off-time. The output capacitor is therefore chosen to limit the output
ripple to an acceptable level depending on load current and input/output voltage differentials and also to
ensure the converter remains stable.
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For continuous conduction mode, the output voltage ripple due to the capacitor discharge is:
VQ
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(VOUT VIN ) I LED
VOUT f COUT
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The output voltage ripple due to the output capacitors ESR is found by:
V I
I
VESR RESR OUT LED L
VIN
2
o
I L
C
Where
VIN (VOUT VIN )
VOUT f L
In ceramic capacitors the ESR is very low so the assumption is that 80% of the output voltage ripple is due to
capacitor discharge and 20% from ESR. Table 1 lists different manufacturers for various output capacitors
and their case sizes suitable for use with the AW36515.
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Input Capacitor Selection
Choosing the correct size and type of input capacitor helps minimize the voltage ripple caused by the
switching of the AW36515 boost converter and reduce noise on the boost converter's input pin that can feed
through and disrupt internal analog signals. In the typical application circuit a 10-µF ceramic input capacitor
works well. It is important to place the input capacitor as close as possible to the AW36515 input (IN) pin. This
reduces the series resistance and inductance that can inject noise into the device due to the input switching
currents. Table 1 lists various input capacitors recommended for use with the AW36515.
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Table 1 Recommended Input/ Output Capacitors (X5R/X7R Dielectric)
MANUFACTURER
PART NUMBER
VALUE
CASE
VOLTAGE RATING
TDK
C1608JB0J106M
10μF
0603
6.3V
TDK
C2012JB1A106M
10μF
0805
10V
Murata
GRM188R60J106M
10μF
0603
6.3V
Murata
GRM21BR61A106KE19
10μF
0805
10V
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Larger capacitors such as a 22µF or capacitors in parallel can be used if lower output voltage ripple is desired.
To estimate the output voltage ripple considering the ripple due to capacitor discharge (ΔVQ) and the ripple
due to the capacitors ESR (ΔVESR) use the following equations:
Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Inductor Selection
The AW36515 is designed to use a 0.47µH or 1µH inductor. When the device is boosting (VOUT > VIN) the
inductor is typically the largest area of efficiency loss in the circuit. Therefore, choosing an inductor with the
lowest possible series resistance is important. Additionally, the saturation rating of the inductor should be
greater than the maximum operating peak current of the AW36515. This prevents excess efficiency loss that
can occur with inductors that operate in saturation. For proper inductor operation and circuit performance,
ensure that the inductor saturation and the peak current limit setting of the AW36515 are greater than IPEAK in
the following calculation:
I PEAK
I LED VOUT
I L
VIN
I L
where
VIN VOUT VIN
2 f SW L VOUT
And f SW =2 or 4MHz.
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Table 2 lists various inductors and their manufacturers that work well with the AW36515.
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Table 2 Recommended Inductors
MANUFACTURER
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PART NO.
SIZE
TOKO
1μH
DFE201610P-1R0M
2.0 mm x 1.6 mm x 1.0 mm
TOKO
0.47μH
DFE201610P-R470M
2.0 mm x 1.6 mm x 1.0 mm
Sunlord
1μH
WPN252012H1R0MT
2.5mm × 2.0mm ×1.2mm
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RDC
3.7A
58mΩ
4.1A
32mΩ
3.4A
48mΩ
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ISAT
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
PCB Layout Consideration
Layout Guidelines
The high switching frequency and large switching currents of the AW36515 make the choice of layout
important. The following steps should be used as a reference to ensure the device is stable and maintains
proper LED current regulation across its intended operating voltage and current range.
1. Place CIN on the top layer (same layer as the AW36515) and as close to the device as possible. The input
capacitor conducts the driver currents during the low-side MOSFET turn-on and turn-off and can detect
current spikes over 2 A in amplitude. Connecting the input capacitor through short, wide traces to both the
IN and GND pins reduces the inductive voltage spikes that occur during switching which can corrupt the
VIN line.
2. Place COUT on the top layer (same layer as the AW36515) and as close as possible to the OUT and GND
pin. The returns for both CIN and COUT should come together at one point, as close to the GND pin as
possible. Connecting COUT through short, wide traces reduce the series inductance on the OUT and GND
pins that can corrupt the VOUT and GND lines and cause excessive noise in the device and surrounding
circuitry.
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3. Connect the inductor on the top layer close to the SW pin. There should be a low-impedance connection
from the inductor to SW due to the large DC inductor current, and at the same time the area occupied by
the SW node should be small so as to reduce the capacitive coupling of the high dV/dT present at SW
that can couple into nearby traces.
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4. Avoid routing logic traces near the SW node so as to avoid any capacitive coupling from SW onto any
high-impedance logic lines such as TX, STROBE/TORCH, SDA, and SCL. A good approach is to insert
an inner layer GND plane underneath the SW node and between any nearby routed traces. This creates a
shield from the electric field generated at SW.
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5. Terminate the Flash LED cathodes directly to the GND pin of the AW36515. If possible, route the LED
returns with a dedicated path so as to keep the high amplitude LED currents out of the GND plane. For
Flash LEDs that are routed relatively far away from the AW36515, a good approach is to sandwich the
forward and return current paths over the top of each other on two layers. This helps reduce the
inductance of the LED current paths.
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Package Description
Pin1 Corner
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TOP VIEW
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SIDE VIEW
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0.40 TYP
D
A
C
SYMM
℄
B
A
1
2
SYMM
℄
3
BOTTOM VIEW
Unit: mm
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Land Pattern Data
0.40 TYP
A
0.40 TYP
B
SYMM
℄
C
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3
2
1
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SYMM
℄
0.05 MAX
All AROUND
0.05 MIN
All AROUND
METAL
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NO N SOLDER MASK DEFINED
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SOLDER MASK
OPENING
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
SOLDER MASK DEFINED
C
Unit: mm
A
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Tape and Reel Information
TAPE DIMENSIONS
REEL DIMENSIONS
P1
P2
P0
K0
W
B0
D1
A0
Cavity
A0：Dimension designed to accommodate the component width
B0：Dimension designed to accommodate the component length
K0：Dimension designed to accommodate the component thickness
W：Overall width of the carrier tape
P0：Pitch between successive cavity centers and sprocket hole
P1：Pitch between successive cavity centers
P2：Pitch between sprocket hole
D1：Reel Diameter
D0：Reel Width
D0
QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE
Sprocket Holes
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Q2
Q1
Q2
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
Q3
Q4
Q3
Q4
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Pocket Quadrants
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Pin 1
Q1
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User Direction of Feed
DIMENSIONS AND PIN1 ORIENTATION
A
D1
(mm)
D0
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
180
9.5
1.4
1.85
0.75
2
4
4
8
Q1
All dimensions are nominal
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
Revision History
Version
Date
Change Record
V1.0
Oct. 2018
Product Datasheet V1.0 Released
V1.1
Oct. 2019
I2C address is modified
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Copyright © 2018 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW36515
Oct. 2019 V1.1
DISCLAIMER
Information in this document is believed to be accurate and reliable. However, Shanghai AWINIC Technology
Co., Ltd (AWINIC Technology) does not give any representations or warranties, expressed or implied, as to
the accuracy or completeness of such information and shall have no liability for the consequences of use of
such information.
AWINIC Technology reserves the right to make changes to information published in this document, including
without limitation specifications and product descriptions, at any time and without notice. Customers shall
obtain the latest relevant information before placing orders and shall verify that such information is current and
complete. This document supersedes and replaces all information supplied prior to the publication hereof.
AWINIC Technology products are not designed, authorized or warranted to be suitable for use in medical,
military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an
AWINIC Technology product can reasonably be expected to result in personal injury, death or severe property
or environmental damage. AWINIC Technology accepts no liability for inclusion and/or use of AWINIC
Technology products in such equipment or applications and therefore such inclusion and/or use is at the
customer’s own risk.
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Applications that are described herein for any of these products are for illustrative purposes only. AWINIC
Technology makes no representation or warranty that such applications will be suitable for the specified use
without further testing or modification.
All products are sold subject to the general terms and conditions of commercial sale supplied at the time of
order acknowledgement.
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Nothing in this document may be interpreted or construed as an offer to sell products that is open for
acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other
industrial or intellectual property rights.
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Reproduction of AWINIC information in AWINIC data books or data sheets is permissible only if reproduction
is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices.
AWINIC is not responsible or liable for such altered documentation. Information of third parties may be subject
to additional restrictions.
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Resale of AWINIC components or services with statements different from or beyond the parameters stated by
AWINIC for that component or service voids all express and any implied warranties for the associated
AWINIC component or service and is an unfair and deceptive business practice. AWINIC is not responsible or
liable for any such statements.
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