MP3336A
Dual-Channel, Flash LED Driver
with 2A/Ch and I2C Interface
DESCRIPTION
The MP3336A is a compact, dual-channel, highpower, flash LED driver that can drive up to 2A in
flash mode for each LED. The MP3336A
improves image and video quality in low light
environments for camera phones. The MP3336A
operates with a selectable 1/2/3/4MHz switching
frequency and uses a synchronous, current-mode
PWM boost converter to regulate the LED current
with two high current sources. The MP3336A
provides a highly efficient, optimized solution for
smaller PCB spaces.
The MP3336A features a standard I2C interface,
dual LED channels, rich protection modes, and
high power density and performance. The
MP3336A can also support flash, assist,
indicator, and 5V DC modes.
The cathodes of the dual-flash LED are
referenced to GND, which improves thermal
performance in layout. The MP3336A is available
in a WLCSP-20 (1.6mmx2.0mm) package.
FEATURES
2.7V~5.5V Input Voltage
1/2/3/4MHz Selectable Max Fsw
Fsw Fold-Back Function
400kHz I2C Compatible Interface
Standby/Flash/Assist/Indicator/5V DC
Modes
Flash Mode
Up to 2A/Ch Programmable Current with
±7% Accuracy for Each LED, 7.84mA/Step
Assist Mode
Up to 319mA/Ch Programmable Current
with ±7% Accuracy for Each LED,
1.25mA/Step
Indicator Mode
Works in 31.5kHz PWM Dimming Mode with
2/16, 3/16, 4/16, 5/16 Duty Cycles
Used for Blinking and 128/256/512ms
Selectable Blinking Time
5V DC Mode
Output Constant 5V DC Voltage
Separated EN1 Pin for NFC Application
1A to 5.5A Programmable Input DC Current
Limit Protection
External Strobe/TX Pin
VIN to VOUT Disconnection Function
Low-Battery Voltage Protection
LED Short/Open Protection
VOUT-GND Short Protection
Over-Voltage Protection (OVP)
Over-Temperature Protection (OTP)
Input Under-Voltage Lockout (UVLO)
Protection
WLCSP-20 (1.6mmx2.0mm) Package
APPLICATIONS
Smartphone Flash LED Application
Cameras for Tablets
Digital Still Camera
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality
Assurance. “MPS” and “The Future of Analog IC Technology” are registered
trademarks of Monolithic Power Systems, Inc.
MP3336A Rev 1.2
11/10/2020
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1
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
TYPICAL APPLICATION
MP3336A Rev 1.2
11/10/2020
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2
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
ORDERING INFORMATION
Part Number*
MP3336AGC
Package
WLCSP-20 (1.6mmx2.0mm)
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MP3336AGC–Z)
TOP MARKING
HE: Product code of MP3336AGC
Y: Year code
LLL: Lot number
PACKAGE REFERENCE
WLCSP-20 (1.6mmx2.0mm)
MP3336A Rev 1.2
11/10/2020
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3
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
PIN FUNCTIONS
Pin #
Name
Description
A4, B4
LED1
Current source for LED1. Connect the anode of the LED to LED1.
C4, D4
LED2
Current source for LED2. Connect the anode of the LED to LED2.
E4
TX
A3, B3,C3
VOUT
D3
EN
E3
STR
Strobe signal input. STR synchronizes the flash pulse to the image capture. STR is
pulled low internally if left floating.
A2, B2
SW
Boost converter switching node.
C2
EN1
Enable 5V mode pin. This pin enables the IC to enter 5V mode even if the EN pin is low.
D2
SCL
I2C interface clock signal.
E2
SDA
I2C interface data.
A1, B1
PGND
Power GND.
C1
AGND
Analog GND.
D1
VIN
E1
NTC
Synchronization input signal for RF transmission signal. TX is pulled low internally if
left floating.
Boost converter output.
IC enable pin.
Input supply. VIN provides power for the internal power and logic circuits. VIN must be
bypassed locally.
LED temperature detection. Connect NTC to a negative thermal coefficient resistor
when in use. Float NTC when not in use.
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
VIN, VSW, VOUT .................................. -0.3V to +6V
NTC ....................................... -0.3V to VIN + 0.3V
All other pins ................................... -0.3V to +6V
Junction temperature ................................ 150°C
Lead temperature...................................... 260°C
Continuous power dissipation (TA = 25°C) (2)
WLCSP-20 (1.6mmx2.0mm) ...................... 2.3W
WLCSP-20 (1.6mmx2.0mm) …55 .... .0.5 .. °C/W
Recommended Operating Conditions (3)
Supply Voltage (VIN) ........................ 2.7V to 5.5V
Operating junction temp. (TJ). ...-40°C to +125°C
MP3336A Rev 1.2
11/10/2020
θJA θJC
NOTES:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation produces an excessive die temperature, causing
the regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
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4
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
ELECTRICAL CHARACTERISTICS
VIN = 3.6V, TA = 25°C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
Max
Units
5.5
V
Supply
Operating input voltage
Input UVLO threshold
VIN
VIN_UVLO
2.7
Rising edge
Input UVLO hysteresis
Standby current
Shutdown current
Operating quiescent current
2.2
V
160
mV
IQ_STANDBY
VIN = 2.7V to 5.5V, I2C active
25
μA
IQ_SD
VIN = 2.7V to 5.5V, EN = low
VIN = 3.6V, no switching,
pass mode
2
μA
IQ
1.5
mA
Switching Regulator
Switching frequency
Minimum on time
fs
SW_FS = 11
0.9
tON_MIN
1
1.1
MHz
68
ns
NMOS on resistance
RDSON_N
VIN = 3.6V
45
mΩ
PMOS on resistance
RDSON_P
VIN = 3.6V
60
mΩ
VOUT_5V
5V DC mode
5
V
VOUT_5.2V
5.2V DC mode
Constant DC output voltage
Inductor current limit
ILIMIT
5
Code setting = 01,
max duty cycle
5.2
5.4
V
4.6
A
0
mA
LED Driver
Flash current setting
Assist current setting
ILED_FLASH
ILED_ASSIST
279
300
0
279
300
mA
mA
321
mA
mV
150
mV
TUP_I = 111
1
μs
TUP_I = 000
8
μs
tRAMP_DOWN
1
μs
VLED_HYS
130
mV
VHD
Current ramp-up step time
tRAMP_UP
Current = 200mA
Input logic low voltage
Input logic high voltage
Strobe/EN1/TX pull-down
resistor
321
350
Current source headroom
voltage
Current ramp-down step
time
LED1/2 load balance voltage
hysteresis
Digital Input
Flash mode,
value setting = 00000000
Flash mode,
value setting = 00100110
Assist mode,
value setting = 00000000
Assist mode,
value setting = 11110000
Current = 1250mA(5)
0.35
1.15
V
V
250
kΩ
NOTE:
5) Guaranteed by design.
MP3336A Rev 1.2
11/10/2020
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5
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
ELECTRICAL CHARACTERISTICS (continued)
VIN = 3.6V, TA = 25°C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
Max
Units
Protection
Flash time-out time
tTIMEOUT
Time setting code = 0001
190
200
210
ms
Input DC current limit
ILIMIT_IN
Current setting code = 0100
Over-voltage threshold
LED1/2 short detection
voltage
VOUT short blanking time
VOVP
Thermal shutdown threshold
5.335
5.555
A
5.665
V
1
V
VOUT < 1V
5
ms
VOUT = 1V
400
mA
VLED_OP
120
mV
Tj_SD
150
°C
130
°C
0.6
1.04
3
3.6
V
V
V
V
VLED_ST
TOUT_ST
PMOS charge current
LED1/2 open detection
voltage
2.6
Adaptive thermal threshold
NTC detection voltage
VNTC
Low battery threshold
VBAT_LOW
Code setting = 001
Code setting = 111
Code setting = 000
Code setting = 110
I2C Interface
Input logic low
VIL
Input logic high
VIH
Output logic low
VOL
SCL clock frequency
FSCL
SCL high time
THIGH
0.6
μs
SCL low time
TLOW
1.3
μs
Data setup time
TSU,DAT
100
ns
Data hold time
THD,DAT
0
Setup time for repeated start
TSU,STA
0.6
μs
Hold time for start
THD,STA
0.6
μs
TBUF
1.3
μs
TSU,STO
0.6
μs
Rise time of SCL and SDA
TR
20+0.1*CB
300
ns
Fall time of SCL and SDA
TF
20+0.1*CB
300
ns
TSP
0
50
ns
400
pF
Bus free time between a
start and a stop condition
Setup time for stop condition
Pulse width of suppressed
spike
Capacitance bus for each
bus line
MP3336A Rev 1.2
11/10/2020
0.4
1.3
ILOAD = 3mA
CB
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V
V
0.4
V
400
kHz
0.9
μs
6
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, L = 1.1µH, I1/2_TOR = 300mA, I1/2_FL = 400mA, I1/2_TX = 400mA, FL_TIM = 200ms,
two channels, unless otherwise noted.
Assist Mode
Assist Mode
Indicator Mode
LED_EN Bit Enable
LED_EN Bit Disable
ILED Duty = 5/16,
ILED_AMPLITUDE/Ch = 100mA
VSW
2V/div.
VOUT
2V/div.
VSW
2V/div.
VOUT
2V/div.
IL
200mA/div.
IL
200mA/div.
ILED
200mA/div.
ILED
200mA/div.
VSW
2V/div.
VOUT
2V/div.
IL
200mA/div.
ILED
200mA/div.
Blinking Mode
Flash Mode
Flash Mode
Blinking Time = 128ms
with Level Trigger Way
with Edge Trigger Way
VSW
2V/div.
VOUT
2V/div.
IL
200mA/div.
ILED
200mA/div.
VSW
2V/div.
VSW
2V/div.
VSTR
2V/div.
VSTR
2V/div.
IL
500mA/div.
IL
500mA/div.
ILED
500mA/div.
ILED
500mA/div.
Flash Mode
Flash Mode
FL_TIM = 1600ms, I1_FL = 2A,
LED2_EN = 0
TX pin with 2Hz, 50% pulse,
I1/2_FL = 1A
VSW
2V/div.
VOUT
5V/div.
IL
2A/div.
ILED1
1A/div.
MP3336A Rev 1.2
11/10/2020
VSW
2V/div.
VTX
5V/div.
Assist Mode
to Flash Mode
I1/2_TOR = 120mA
VSW
2V/div.
VSTR
2V/div.
IL
1A/div.
IL
500mA/div.
ILED
1A/div.
ILED
500mA/div.
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7
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.6V, L = 1.1µH, I1/2_TOR = 300mA, I1/2_FL = 400mA, I1/2_TX = 400mA, FL_TIM = 200ms,
two channels, unless otherwise noted.
MP3336A Rev 1.2
11/10/2020
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8
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
BLOCK DIAGRAM
OVP
Input Current
Limit
Regulator
OSC
RAMP
PWM
Control
Current
Control
EA
I2C
Control
LED1& 2
Feedback
Ref
Protection
Control
5V
Mode
NTC
DEC
Figure 1: Functional Block Diagram
MP3336A Rev 1.2
11/10/2020
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9
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
OPERATION
The MP3336A is a dual-channel, LED driver
with an I2C interface that supports image
capture for camera flash. The MP3336A works
in flash mode, assist mode, indicator mode, and
fixed 5V DC output mode. Table 1 shows how
to set these operation modes.
LED Driver Operation
The MP3336A is a synchronous, current-mode,
PWM, boost converter that works with
1/2/3/4MHz. The MP3336A regulates the boost
loop by detecting and controlling the headroom
voltage across the current source (VOUTVLED1/2).
When the device is enabled by LED_EN, the
synchronous PMOS works as a 400mA current
source first to charge the output capacitor until
VOUT rises above 2.3V. The device changes to
boost switching mode if the voltage across the
current source is less than the target headroom
reference. If VIN is very close to VOUT, the IC
switches to boost switching mode and pass
mode automatically to minimize power loss. In
pass mode, the synchronous PMOS is fully
turned on. During the current start-up, the
current ramps up step-by-step smoothly until
the target setting current is reached.
Table 1: Operation Mode Setting
Configuration
TX
X
X
X
0
High
X
X
EN1
High
X
X
X
X
X
X
MP3336A Rev 1.2
11/10/2020
EN1_OFF
0
1
1
1
1
1
1
STR
Float
Float
X
High
High
X
X
LED1/2_EN
X
1
1
1
1
1
X
STR_MOD
X
X
X
1
1
0
X
5V_MOD
X
X
X
X
X
X
1
LED_MOD
XX
10
01
11
11
11
X
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Mode
5V
Assist
Indicator
Flash
Flash
Flash
5V
10
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Standby Mode
By default, if VIN is higher than UVLO and EN is
pulled high, the device enters standby mode. In
this mode, only the I2C is active and ready to
communicate with the host.
Assist Mode
To enter assist mode, set the LED_MOD
register to 10 and LED1/2_EN to 1. The current
ramps up to the target value, which is set by
I1_TOR and I2_TOR. The ramp-up slew rate
can be set by register TUP_I. The current can
be disabled by switching to standby mode or by
setting the LED1/2_EN bits to 0. These two bits
control the two LED current sources
respectively (see Figure 2).
Figure 3: Indicator Mode
In indicator mode, the MP3336A can also work
in blinking mode. If blinking is enabled, the IC
works in indicator mode during the blinking time,
and the LED current source is disabled during
the blinking time (see Figure 4). The blinking
time is set by the TBK0-1 bits in register 0FH.
Figure 4: Blinking Time
Figure 2: Assist Mode
Indicator Mode
When LED_MOD is set to 01 and LED_EN1/2
is set to 1, the MP3336A enters indicator mode,
which provides a low-current output (see Figure
3). In this mode, the driver current sources work
in a 31.5kHz PWM dimming mode. The current
amplitude can be set by I1_TOR and I2_TOR,
while the indicator current step ramps up more
quickly at a rate of 7.84mA/step, compared to
assist mode’s ramp-up rate of 1.25mA/step.
The final amplitude in this mode can be
calculated with Equation (1):
7.84mA x I1/2_TOR
(1)
The duty cycle is set by the INDI_PWM register.
When disabled, switch to standby mode or set
the LED1_EN and LED2_EN bits to 0.
MP3336A Rev 1.2
11/10/2020
Flash Mode
The device works in flash mode in three ways:
hardware and level trigger mode, hardware and
edge trigger mode, and software and edge
trigger mode.
1. Hardware and Level Trigger Mode
In this mode, STR_MOD = 1, STR_LV = 1,
LED1/2_EN = 1, LED_MOD = 11. The flash
current begins to ramp up after STR goes high.
The current is set by I1_FL and I2_FL, and the
ramp-up time is set by TUP_I. The flash current
ends when STR is pulled low or when the flash
timer ends. After the flash, LED_MOD is reset
to standby mode, and LED1/2_EN is set to 0 if
LED_SD = 0. If LED_SD = 1, LED_MOD and
LED1/2_EN are not reset. The LED1 and LED2
current sources are controlled by the LED1_EN
and LED2_EN bits respectively. If the STR is
pulled low before the flash timer ends, the flash
current shuts down at the STR falling edge (see
Figure 5). Conversely, if the flash timer set by
FL_TIM ends before STR goes low, the flash
current terminates immediately. The time-out
indicator bit FT_TO is set to 1 and not cleared
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11
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
until it is read back or the input power resets
(see Figure 6).
Figure 5: Hardware and Level Trigger Flash
Mode without Time-Out
Figure 7: Hardware and Edge Trigger Flash Mode
3. Software and Edge Trigger Mode
In this mode, without STR, STR_MOD = 0,
LED1/2_EN = 1, and LED_MOD = 11. The
current is set by I1_FL and I2_FL, and the
ramp-up time is set by TUP_I. The flash current
ends when the flash timer set by FL_TIM ends.
After the flash, the LED_MOD is reset to
standby mode if LED1/2_EN is set to 0 with
LED_SD = 0. If LED_SD = 1, the LED_MOD is
not reset if ILED1/2_EN is set to 0. The LED1
and LED2 current sources are controlled by the
LED1_EN and LED2_EN bits respectively (see
Figure 8)
Figure 6: Hardware and Level Trigger Flash
Mode with Time-Out
2. Hardware and Edge Trigger Mode
In this mode, STR_MOD = 1, STR_LV = 0,
LED1/2_EN = 1, and LED_MOD = 11. The flash
current begins to ramp up after STR goes high.
The current is set by I1_FL and I2_FL, and the
ramp-up time is set by TUP_I. The flash current
ends when the flash timer set by FL_TIM ends.
After the flash, the LED_MOD is reset to
standby mode, and LED1/2_EN is set to 0 if
LED_SD = 0. If LED_SD = 1, the mode and
LED_MOD and LED1/2_EN are not reset. The
LED1 and LED2 current sources are controlled
by the LED1_EN and LED2_EN bits
respectively (see Figure 7).
MP3336A Rev 1.2
11/10/2020
Figure 8: Software and Edge Trigger Flash Mode
Assist Mode to Flash Mode
During assist light mode, the device can switch
to flash mode from assist mode directly when
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12
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
STR goes from low to high if STR_MOD = 1.
After the flash, the part functions the same way
as in flash mode (see Figure 9).
Figure 10: 5V DC Mode through I2C
Maximum Switching Frequency Setting
The maximum switching frequency can be
selected by the SW_FS bits when working in
boost mode. 1/2/3/4MHz can be selected to
optimize efficiency.
Figure 9: Assist Mode to Flash Mode
5V DC Output Mode
The MP3336A can enter 5V mode whether EN
is high or low.
1.
EN is low
When EN is low, the IC enters 5V mode by
pulling EN1 high. It is especially designed
for NFC application.
2.
EN is high
a) Through I2C
The IC enters 5V mode by setting
5V_MOD to 1.
b) Through EN1
If EN1_OFF is 0, then the IC can work in
5V mode by pulling EN1 high.
When the MP3336A works in 5V mode, the
control loop is taken over by the voltage loop
(see Figure 10). The LED current sources can
still output a current if the mode conditions are
met (described above). Care must be taken to
ensure that the thermal condition is normal,
since 5V directly powers the LED. It is
recommended to set LED1/2_EN to 0 during 5V
mode.
The VOUT is programmed by the VOUT bit
(5V/5.2V).
MP3336A Rev 1.2
11/10/2020
Switching Frequency Fold-Back
The MP3336A will work in the max switching
frequency set to 2/3/4MHz in switching mode if
the voltage of the current source is larger than
the value set by the register bits VTH_PAS,
otherwise the IC switches to 1MHz to improve
efficiency and EMI. If the voltage across the
current source is still larger than the value set
by the register bits VTH_PAS, the IC can
stretch the frequency down with FS_SD = 0. If
the LED load becomes lighter and the input
voltage increases further, the IC switches to
pass mode. With FS_SD = 1, the IC switches
directly to pass mode from 1MHz.
If EN1 enables 5V mode, the IC works in pulse
skipping mode when there is no load. The IC
adds a 300~400µA load to control VOUT well.
LED Output Current Reduction
When the MP3336A works in flash mode,
output current reduction may occur in the
following conditions:
1. TX is High
During flash mode, if TX goes from low to high,
the flash current drops to the current set by
I_TX in under 5µs, and the IC sets the FT_TX
bit to 1. If TX goes low, the current ramps up to
the flash current again (see Figure 11).
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13
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Low Battery Voltage Protection
The device provides low battery voltage
protection in flash mode in the following ways:
Figure 11: Flash Mode with TX Pulse
2. Input DC Current Limit is Triggered
If the input DC current limit set by IL_DC
register is not sufficient, a current reduction
may occur. The actual current in the IFL_ACT
register can be read back during flash.
3. Low Battery Voltage Threshold Is
Triggered
During flash pulse, if the battery voltage drops
below the threshold set by VBL_RUN, the
current reduces step-by-step until the battery
voltage rises up to the set low battery voltage
threshold. Both the actual current in the
IFL_ACT register and the minimum current
caused by the current reduction in IFL_MIN can
be read back after flash.
Input DC Current Limit Protection
The MP3336A uses the input DC current limit
protection to avoid drawing too much current
from the battery. This current limit can be
programmed by the IL_DC register from 1.66A
to 5.5A with 330mA/step when IL_DC < 4.3A
and 400mA/step when IL_DC > 4.3A. If the
input current hits the input current limit
threshold, the LED output current stops
increasing and holds until the input current
drops below the current limit threshold. The
fault bit FT_IDC is set to 1 if the input current
limit is triggered. The fault bit remains until it is
read back or the input power is reset. The input
current limit protection is useful in boost mode
because it senses the current of the low-side
MOSFET.
MP3336A Rev 1.2
11/10/2020
1. Before the flash, if VBL_SD = 1, and the
input voltage is lower than the threshold set
by VBL_RUN, the device remains disabled
and sets the fault bit FT_VBATL to 1. If
VBL_SD = 0, the device ramps to the
current set by I_TX and sets the fault bit
FT_VBATL to 1. The fault bit is cleared after
it is read back or when the input power
resets.
2. During flash start-up, if the input voltage is
lower than the threshold set by VBL_RUN,
the current stops ramping. The fault bit
FT_VBATL is set. During flash pulse, if the
input voltage is lower than the threshold set
by VBL_RUN, the current ramps down stepby-step. The fault bit is set until it is read
back or when the input power resets.
After the flash, the minimum current caused
by the current reduction can be read back
through the IFL_MIN register. The IFL_MIN
value holds until the next flash occurs or
until the power resets. The actual current
can be read back through IFL_ACT during
flash. This function is useful for determining
how much flash current can be drawn from
the battery (see Figure 12).
Figure 12: Pre-Flash under Low Battery
NTC Detection
If the register NTC_WD is set to enable NTC
detection, the NTC sources a constant 35µA
current. If the voltage across the NTC resistor
drops below the threshold set by NTC_WD, the
internal fault bit FT_LEDHOT is set to 1 and the
modes are reset to standby mode if LEDT_SD
= 1. If LEDT_SD = 0, the mode setting is not
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14
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
reset after the fault bit is set. The fault bit
remains until it is read back or the power resets.
It is recommended to float NTC if this function is
not being used.
Figure 13: NTC Detection
VOUT-GND Short Protection
If VOUT < 1V, the device stops switching and
disconnects the synchronous PMOS to prevent
a large current from being drawn from the
battery. Set the FT_VOSC bit to 1 and reset the
mode setting. The fault bit remains until it is
read back or the power resets.
LED1/2-GND Short Protection
If LED1 < 1V and ILED1 > 5mA, or LED2 < 1V
and ILED2 > 5mA, the IC marks off the current
source and sets the fault bit FT_LEDSC but
continues switching. If both current sources are
marked off, the device stops switching and the
mode setting is reset. The fault bit FT_LEDSC
is 1 until it is read back or the power resets. If
LED_EN1 is set to 0, the feedback of current
source 1 is not involved in the loop control, and
fault detections on this channel are disabled.
LED1/2 Open Protection
If VOUT - VLED1/2 < 110mV and VOUT > 5.5V,
the IC marks off the fault current source and
sets the fault bit FT_OVP but continues
switching. If both current sources are marked
off, the device stops switching and the mode
setting is reset. The fault bit FT_OVP is 1 until it
is read back or the power resets. If LED_EN1 is
set to 0, the feedback of current source 1 is not
involved in loop control, and fault detection on
this channel is disabled.
Output Over-Voltage Protection (OVP)
Junction Over-Temperature Protection
If LED_OTAD = 1, the flash current drops to the
current set by I_TX when TJ > 130°C. The fault
bit FT_OTP is set to 1. If TJ > 150°C, the device
stops switching and resets LED_MOD and
LED_EN1/2. The fault bit FT_OTP must be
cleared to 0 by a read-back or a power reset.
Time-Out Protection
If the device works in one of the flash modes—
hardware and level trigger mode—time-out
protection may be triggered. When the STR
input pulse is longer than the flash timer set by
FL_TIM, the device is disabled once the timer
ends. The device stops switching and resets
the mode setting; the fault bit is 1 until it is read
back or the power is reset before restarting.
Under-Voltage Lockout (UVLO) Protection
If VIN drops below the UVLO threshold, the
device stops and all of the registers are reset to
default.
I2C Interface Register Description
I2C Chip Address
After the start condition, the I2C compatible
master sends a seven-bit address followed by
an eighth read (Read: 1) or write (Write: 0) bit.
The following bit indicates the register address
to or from which the data is written or read. The
I2C address of the MP3336A is 0x27.
I2C Compatible Device Address
If VOUT > 5.5V, the device stops switching and
resumes normal operation once VOUT drops
below 5.2V. The fault bit FT_OVP is 1 until it is
read back or the power resets.
MP3336A Rev 1.2
11/10/2020
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15
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Register Mapping
Add
Reg
D7
D6
D5
D4
D3
D2
D1
D0
00H
Chip ID
DEV_ID4
DEV_ID3
DEV_ID2
DEV_ID1
DEV_ID0
REV_ID2
REV_ID1
REV_ID0
01H
Mode
STR_LV
STR_MOD
VOUT
LED1_EN
LED2_EN
LED_MOD1
LED_MOD0
5V_MOD
02H
Peak
current
NTC_WD2
NTC_WD1
NTC_WD0
IL_PEAK1
IL_PEAK0
FS_SD
EN1_OFF
NA
03H
Flash
timer
FL_TIM3
FL_TIM2
FL_TIM1
FL_TIM0
LED_SD
LEDT_SD
SW_FS1
SW_FS0
04H
Low
battery
voltage
VBL_RUN2
VBL_RUN1
VBL_RUN0
VBL_SD
IL_DC3
IL_DC2
IL_DC1
IL_DC0
05H
Indicator
LED_OTA
D
TUP_I2
TUP_I1
TUP_I0
VTH_PAS 1
VTH_PAS2
INDI_PWM1
INDI_PWM0
I1_FL7
I1_FL6
I1_FL5
I1_FL4
I1_FL3
I1_FL2
I1_FL1
I1_FL0
I2_FL7
I2_FL6
I2_FL5
I2_FL4
I2_FL3
I2_FL2
I2_FL1
I2_FL0
I1_TX7
I1_TX6
I1_TX5
I1_TX4
I1_TX3
I1_TX2
I1_TX1
I1_TX0
I2_TX7
I2_TX6
I2_TX5
I2_TX4
I2_TX3
I2_TX2
I2_TX1
I2_TX0
IFL_ACT7
IFL_ACT6
IFL_ACT5
IFL_ACT4
IFL_ACT3
IFL_ACT2
IFL_ACT1
IFL_ACT0
IFL_MIN7
IFL_MIN6
IFL_MIN5
IFL_MIN4
IFL_MIN3
IFL_MIN2
IFL_MIN1
IFL_MIN0
I1_TOR7
I1_TOR6
I1_TOR5
I1_TOR4
I1_TOR3
I1_TOR2
I1_TOR1
I1_TOR0
I2_TOR7
I2_TOR6
I2_TOR5
I2_TOR4
I2_TOR3
I2_TOR2
I2_TOR1
I2_TOR0
FT_VBATL
FT_OVP
FT_VOSC
FT_LEDSC
FT_OTP
FT_TO
FT_TX
FT_IDC
TBK1
TBK0
NA
NA
NA
Ready_5V
FT_LEDHOT
FT_LEDOP
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
LED1
flash
current
LED2
flash
current
TX1MAS
K current
TX2MAS
K current
Actual
flash
Minimum
flash
LED1
torch
LED2
torch
Fault
indication
Fault
indication
Table 2: Chip ID Register
Addr: 0x00
Bit
Bit Name
Access
Default
Description
2:0
REV_ID
R
011
Revision ID.
7:3
DEV_ID
R
00111
MP3336A Rev 1.2
11/10/2020
Device ID.
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16
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 3: Mode Setting Register
Addr: 0x01
Bit
Bit Name
Access
Default
7
STR_LV
RW
1
6
STR_MOD
RW
1
5
VOUT
RW
0
4
LED1_EN
RW
0
3
LED2_EN
RW
0
2:1
LED_MOD
RW
00
0
5V_MOD
RW
0
Description
Flash mode trigger mode with strobe pin signal.
0 = edge sensitive
1 = level sensitive
Strobe pin enable bit.
0 = software enable
1 = hardware enable
DC Mode VOUT set bit
0 = 5.2V
1 = 5V
LED1 current source enable bit.
0 = LED current sink disable
1 = enable
LED2 current source enable bit.
0 = LED current sink disable
1 = enable
Device mode setting bits.
00 = standby
01 = indicator mode
10 = assist mode
11 = flash mode
5V DC output enable bit.
0 = disable
1 = enable
Table 4: NTC Detection and Current Limit Setting Register
Addr: 0x02
Bit
Bit Name
Access
Default
7:5
NTC_WD
RW
000
4:3
IL_PEAK
RW
01
2
FS_SD
RW
0
1
EN1_OFF
RW
0
0
NA
RW
NA
MP3336A Rev 1.2
11/10/2020
Description
NTC pin detection window.
000 = off
001 = 0.6V
010 = 0.67V
……
111 = 1.02V
Inductor current limit setting bits.
00 = 2.4A
01 = 3.0A
10 = 4.2A
11 = 5.4A
Disable switching frequency stretching down from 1MHz if VIN is
close to VOUT.
0 = enable FS stretching down function
1 = disable FS stretching down function
External EN1 pin enable/disable bit.
0: EN1 pin enable
1: EN1 pin disable
Reserved.
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17
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 5: Flash Timer Setting Register
Addr: 0x03
Bit
Bit Name
Access
Default
7:4
FL_TIM
RW
0001
3
LED_SD
RW
0
2
LEDT_SD
RW
0
1:0
SW_FS
RW
00
Description
Flash timer setting bits. 100ms to 1600ms, 100ms/step.
0000 = 100ms
0001 = 200ms
…….
1111 = 1600ms
LED_MOD and LED1/2_EN resetting control bit.
0 = reset LED_MOD and LED1/2_EN to default value
after flash
1 = no reset
LED_MOD and LED1/2_EN resetting control bit when
NTC fault occurs.
0 = no reset and device continues
1 = reset and device stops
Max Switching frequency setting bits.
00 = 4MHz
01 = 3MHz
10 = 2MHz
11 = 1MHz
Table 6: Low Battery Voltage Setting Register
Addr: 0x04
Bit
Bit Name
Access
Default
7:5
VBL_RUN
RW
111
4
VBL_SD
RW
1
3:0
IL_DC
RW
0100
MP3336A Rev 1.2
11/10/2020
Description
Low battery voltage setting bits. If VIN drops blow this
voltage during start-up, the current ramping stops. If,
during flash current pulse, the current decreases until VIN
is higher than its threshold, it works only in flash mode.
0.1V per step.
000 = 3V
001 = 3.1V
……
110 = 3.6V
111 = disabled
1 = device disabled when VIN is less than the threshold
set by VBL_RUN before flash
0 = enable and current ramps up to current set by I_TX
Input DC current limit setting bits. 1A to 5.5A.
1.66A to 3.97A: 330mA/step
0000 = 1.66A
0100 = 2.98A
......
1000 = 4.30A
>4.3A: 400mA/step
1001 = 4.7A
1010 = 5.1A
1011 = 5.5A
1100: disable IL_DC function.
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18
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 7: Indicator Register
Addr: 0x05
Bit
Bit Name
Access
Default
7
LED_OTAD
RW
0
6:4
TUP_I
RW
001
3:2
VTH_PAS
RW
01
1:0
INDI_PWM
RW
00
Description
Adaptive thermal flash current control bit.
1 = current reduces to the current set by I_TX when TJ >
130°C
0 = disable when TJ > 150°C
Current ramp-up time per step.
000 = 8µs
001 = 7µs
……
111 = 1µs
Defines the threshold when FS drops down to 1MHz or
switches to pass mode from boost mode.
00 = 300mV
01 = 450mV
10 = 600mV
11 = 750mV
PWM duty cycle of 31.5kHz in indicator mode.
00 = 2/16
01 = 3/16
10 = 4/16
11 = 5/16
Table 8: LED1 Flash Current Setting Register
Addr: 0x06
Bit
Bit Name
7:0
I1_FL
Access
RW
Default
00110011
Description
LED1 flash current setting bits. 0 to 2000mA,
7.84mA/step (default 00110011 = 400mA).
00000000 = 0mA
......
11111111 = 2000mA
Table 9: LED2 Flash Current Setting Register
Addr: 0x07
Bit
Bit Name
7:0
MP3336A Rev 1.2
11/10/2020
I2_FL
Access
RW
Default
00110011
Description
LED2 flash current setting bits. 0 to 2000mA,
7.84mA/step (default 00110011 = 400mA).
00000000 = 0mA
......
11111111 = 2000mA
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19
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 10: TX Current Setting Register for LED1
Addr: 0x08
Bit
Bit Name
7:0
I1_TX
Access
RW
Default
00110011
Description
Define the LED1 flash current in flash mode if TX is
high. 0 to 2000mA, 7.84mA/step (default 00110011 =
400mA).
00000000 = 0mA
......
11111111 = 2000mA
Table 11: TX Current Setting Register for LED2
Addr: 0x09
Bit
Bit Name
7:0
I2_TX
Access
RW
Default
00110011
Description
Define the LED2 flash current in flash mode if TX is
high. 0 to 2000mA, 7.84mA/step (default 00110011 =
400mA).
00000000 = 0mA
......
11111111 = 2000mA
Table 12: Actual Flash LED Current Register
Addr: 0x0A
Bit
7:0
Bit Name
IFL_ACT
Access
R
Default
00000000
Description
The actual flash current in flash mode. 0 to 2000mA,
7.84mA/step.
00000000 = 0mA
......
11111111 = 2000mA
Table 13: Minimum Flash LED Current Register
Addr: 0x0B
Bit
Bit Name
7:0
MP3336A Rev 1.2
11/10/2020
IFL_MIN
Access
R
Default
00000000
Description
The minimum flash current caused by low battery
voltage current reduction in flash mode. 0 to 2000mA,
7.84mA/step.
00000000 = 0mA
……
11111111 = 2000mA
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20
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 14: LED1 Torch Current/Indicator Amplitude Setting Register
Addr: 0x0C
Bit
7:0
Bit Name
I1_TOR
Access
RW
Default
00010101
Description
In assist mode: LED1 current setting bits. 0 to
319mA, 1.25mA/step (default 00010101 = 26mA).
00000000 = 0mA
......
11111111 = 319mA
In indicator mode: LED1 current amplitude.
7.84mA/step (default 00010101 = 165mA).
00000000 = 0mA
00000001 = 7.84mA......
Table 15: LED2 Torch Current/Indicator Amplitude Setting Register
Addr: 0x0D
Bit
7:0
MP3336A Rev 1.2
11/10/2020
Bit Name
I2_TOR
Access
RW
Default
00010101
Description
In assist mode: LED2 current setting bits. 0 to
319mA, 1.25mA/step (default 00010101 = 26mA).
00000000 = 0mA
......
11111111 = 319mA
In indicator mode: LED2 current amplitude.
7.84mA/step (default 00010101 = 165mA).
00000000 = 0mA
00000001 = 7.84mA......
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21
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 16: Fault and Flag Indication Register
Addr: 0x0E
Bit
Bit Name
Access
Default
7
FT_VBATL
R
0
6
FT_OVP
R
0
5
FT_VOSC
R
0
4
FT_LEDSC
R
0
3
FT_OTP
R
0
2
FT_TO
R
0
1
FT_TX
R
0
0
FT_IDC
R
0
Description
Low battery voltage fault bit.
0 = no fault
1 = fault
Output over-voltage fault bit.
0 = no fault
1 = fault
VOUT-GND short fault bit.
0 = no fault
1 = fault
LED short fault bit.
0 = no fault
1 = fault
Junction over-temperature fault bit.
0 = no fault
1 = fault
Flash time-out indicator bit.
0 = no fault
1 = fault
TX high indicator bit.
0 = no fault
1 = fault
Input DC current limit fault bit.
0 = no fault
1 = fault
Table 17: Fault Indication and Blink Time Setting Register
Addr: 0x0F
Bit
Bit Name
Access
Default
Description
7:6
TBK
R/W
01
Blinking time setting bits in indicator mode.
00: no blinking, LED remains on
01: Tblink = 128ms
10: Tblink = 256ms
11: Tblink = 512ms
5:4
NA
R
NA
Reserved.
3
NA
R
NA
Reserved.
2
Ready_5V
R
0
1
FT_LEDHOT
R
0
0
FT_LEDOP
R
0
MP3336A Rev 1.2
11/10/2020
1: 5V Mode Ready, real-time indicates the status
0: no 5V Mode
NTC fault bit.
0 = no fault
1 = fault
LED open fault bit.
0 = no fault
1 = fault
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22
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
APPLICATION INFORMATION
Selecting the Output Capacitor
Selecting the Input Capacitor
The output capacitor keeps the output voltage
ripple small and ensures feedback loop stability.
The output capacitor impedance must be low at
the switching frequency. Ceramic capacitors with
X7R dielectrics are recommended for their low
ESR characteristics. Ensure that the ceramic
capacitance is dependent on the voltage rating.
The DC bias voltage and the value can lose as
much as 50% of their capacitance at the rated
voltage rating. Ensure that enough of a voltage
rating margin is left when selecting the
component. A capacitance that is too low can
cause loop instability. For most applications, a
10μF ceramic capacitor is sufficient.
The input capacitor reduces the surge current
drawn from the input supply and the switching
noise from the device. The input capacitor
impedance at the switching frequency should be
less than the input source impedance to prevent
the high-frequency switching current from
passing through to the input. Ceramic capacitors
with X5R or X7R dielectrics are recommended
for their low ESR and small temperature
coefficients. A capacitor with a higher value can
help reduce input voltage ripple and noise. For
most applications, a 10μF ceramic capacitor is
sufficient.
Selecting the Inductor
The converter requires an inductor to supply a
higher output voltage while being driven by the
input voltage. An inductor with a larger value
results in less ripple current, a lower peak
inductor current, and reduced stress on the
internal N-channel MOSFET, but also has a
larger physical size, higher series resistance, and
lower saturation current.
Choose an inductor that does not saturate under
the worst-case load conditions. Select the
minimum inductor value to ensure that the boost
converter works in continuous conduction mode
with high efficiency and good EMI performance.
Calculate the required inductance value using
Equation (2) and Equation (3):
L
η VOUT D (1 D)2
2 fSW ILOAD
D 1
VIN
VOUT
PCB Layout Guidelines
Efficient PBC layout is critical for stable operation.
For best results, follow the guidelines below.
1. Place a ceramic capacitor close to VIN.
2. Use a wider copper wire for input, output, and
GND to improve thermal performance.
3. Put as many vias close to GND at the output
and input capacitors as possible to improve
thermal performance.
(2)
(3)
Where VIN and VOUT are the input and output
voltages, fSW is the switching frequency, ILOAD is
the LED load current, and η is the efficiency.
The switching current is used for peak-current
mode control. To avoid hitting the current limit,
the worst-case inductor peak current should be
less than 80% of the current-limit (ILIM). For most
applications, a 0.47µH~2µH inductor is sufficient.
MP3336A Rev 1.2
11/10/2020
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23
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
TYPICAL APPLICATION CIRCUIT
Figure 14: Dual-Channel Application Circuit
MP3336A Rev 1.2
11/10/2020
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24
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
PACKAGE INFORMATION
WLCSP20 (1.6mmx2.0mm)
PIN 1 ID
PIN 1 ID
MARKING
PIN 1 ID
INDEX AREA
BOTTOM VIEW
TOP VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) BALL COPLANARITY SHALL BE 0.05
MILLIMETER MAX.
3) JEDEC REFERENCE IS MO-211.
5) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
MP3336A Rev 1.2
11/10/2020
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25
MP3336A – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Revision History
Revision #
1.1
1.2
Revision Date
09/10/2020
11/09/2020
Description
Add min and max value of VOUT_5.2V in EC table
Change the default of (0x01, bit5) to 0 from 1
Pages Updated
Page 5
Page 17
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP3336A Rev 1.2
11/10/2020
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