MPQ4425B
High-Efficiency, 1.5A, 36V, 400kHz,
Synchronous, Step-Down, LED Driver,
AEC-Q100 Qualified
DESCRIPTION
FEATURES
The
MPQ4425B
is
a
high-frequency,
synchronous, rectified, step-down, switch-mode
white LED driver with built-in power MOSFETs.
It offers a compact solution to achieve a 1.5A of
continuous output current with excellent load and
line regulation over a wide input supply range.
Synchronous mode operation ensures high
efficiency, while current mode operation
provides fast transient responses and eases
loop stabilization. Additional features include
over-current protection (OCP) and thermal
shutdown (TSD).
This device requires a minimal number of readily
available, external components, and is available
in space-saving QFN-13 (2.5mmx3mm) and
TSOT23-8 packages.
Wide 4V to 36V Operating Input Range
85mΩ/50mΩ Low RDS(ON) Internal Power
MOSFETs
High-Efficiency Synchronous Mode
Operation
Default 400kHz Switching Frequency
PWM Dimming (Min 100Hz Dimming
Frequency)
Forced CCM Mode
0.2V Reference Voltage
Internal Soft Start
Fault Indication for LED Short, Open, and
Thermal Shutdown
Over-Current Protection (OCP) with ValleyCurrent Detection
Thermal Shutdown
CISPR25 Class 5 Compliant
Available in QFN-13 (2.5mmx3mm) and
TSOT23-8 Packages
Available in AEC-Q100 Grade 1
APPLICATIONS
Automotive LED Lighting
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,” the MPS logo, and “Simple, Easy Solutions” are
registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
TYPICAL APPLICATION
Efficiency vs. Input Voltage
VLED = 6.4V
96
BST
MPQ4425B
SW
LED+
EN/DIM
VCC
/FAULT
FB
/FAULT
PGND AGND
LED-
EFFICIENCY (%)
EN/DIM
94
92
90
88
ILED=1.5A
86
ILED=1A
84
ILED=0.8A
ILED=0.5A
82
8
12
16
20
24
28
INPUT VOLTAGE (V)
MPQ4425B Rev. 1.0
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36
1
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
ORDERING INFORMATION
Part Number*
MPQ4425BGJ-AEC1***
Package
TSOT23-8
Top Marking
MSL Rating**
MPQ4425BGQB-AEC1
MPQ4425BGQBE-AEC1****
QFN-13 (2.5mmx3.0mm)
QFN-13 (2.5mmx3.0mm)
See Below
Level 1
* For Tape & Reel, add suffix –Z (e.g. MPQ4425BGJ-AEC1–Z).
** Moisture Sensitivity Level Rating
*** Under Qualification
****Wettable Flank
TOP MARKING (MPQ4425BGJ-AEC1)
BHQ: Product code of MPQ4425BGJ-AEC1
Y: Year code
TOP MARKING (MPQ4425BGQB-AEC1)
BFM: Product code of MPQ4425BGQB-AEC1
Y: Year code
WW: Week code
LLL: Lot number
TOP MARKING (MPQ4425BGQBE-AEC1)
BFQ: Product code of MPQ4425BGQBE-AEC1
Y: Year code
WW: Week code
LLL: Lot number
MPQ4425B Rev. 1.0
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9/9/2019
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© 2019 MPS. All Rights Reserved.
2
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
PACKAGE REFERENCE
TOP VIEW
TOP VIEW
PGND
PGND
PGND
BST
13
12
11
10
9
IN
IN
SW
1
8
3
NC
5
4
6
/FAULT EN/DIM
8
FB
IN
2
7
VCC
SW
3
6
EN/
DIM
PGND
4
5
BST
AGND
2
7
1
/FAULT
VCC
FB
QFN-13 (2.5mmx3.0mm)
TSOT23-8
PIN FUNCTIONS
QFN-13
Pin #
TSOT23-8
Pin #
Name
1, 2
2
IN
3
NC
4
1
/FAULT
5
6
EN/DIM
6
8
FB
7
7
VCC
8
AGND
9
3
SW
10
5
BST
11, 12, 13
4
PGND
Description
Supply voltage. The MPQ4425B operates from a 4V to 36V input rail. CIN is
required to decouple the input rail. Connect using a wide PCB trace.
Do not connect.
Fault indicator. Open-drain output. Pulled low during LED short circuit, open
circuit, or thermal shutdown.
Enable/dimming control. Pull EN high to enable the device. Apply a 100Hz
to 2kHz external clock to the EN/DIM pin for PWM dimming.
LED current feedback input.
Internal bias supply. Decouple VCC with a 0.1μF to 0.22μF capacitor. The
capacitance should not exceed 0.22μF.
Analog ground. Reference ground of the logic circuit. AGND is connected to
PGND internally. It is not necessary to externally connect AGND and PGND,
but it is recommended for improved ground connection.
Switch output. Connect using a wide PCB trace.
Bootstrap. Requires a capacitor connected between the SW and BST pins
to form a floating supply across the high-side switch driver. A 20Ω resistor
placed between the SW and BST capacitors is strongly recommended to
reduce SW spike voltage.
Power ground. PGND is the reference ground of the power device, and
requires careful consideration during PCB layout. For optimal results, connect
PGND with copper pours and vias.
MPQ4425B Rev. 1.0
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9/9/2019
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3
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
θJA
θJC
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
Supply voltage (VIN) ..................... -0.3V to +40V
Switch voltage (VSW) ............. -0.3V to VIN + 0.3V
BST voltage (VBST) ...............................VSW + 6V
All other pins ...............................-0.3V to +6V (2)
Continuous power dissipation (TA = 25°C) (3)
QFN-13 (2.5mmx3mm) ............................ 2.08W
TSOT23-8 ................................................ 1.25W
Junction temperature ............................... 150°C
Lead temperature .................................... 260°C
Storage temperature ................ -65°C to +150°C
QFN-13 (2.5mmx3mm)
JESD51-7 (5) ........................... 60 ...... 13 ... °C/W
EVQ4425B-QB-00A (6)............ 42 ...... 2.5 .. °C/W
TSOT23-8
JESD51-7 (5) .......................... 100 ..... 55 ... °C/W
EVQ4425B-J-00A (6) ............... 45 ....... 3 .... °C/W
Electrostatic Discharge (ESD)
HBM (human body model) .........................±2kV
CDM (charged device model) ................. ±750V
Recommended Operating Conditions
Supply voltage (VIN) ........................... 4V to 36V
LED current (ILED) .............................. Up to 1.5A
Operating junction temp (TJ) (4)
.…..………………………………-40°C to +125°C
Notes:
1) Absolute maximum ratings are rated under room temperature
unless otherwise noted. Exceeding these ratings may damage
the device.
2) For details on the EN/DIM pin’s ABS MAX ratings, see the
Enable Control section on page 16.
3) 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 causes excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
4) Operation of the device at a junction temperature up to 150C
is possible; contact MPS for details.
5) Measured on JESD51-7, 4-layer PCB. The value of θJA given
in this table is only valid for comparison with other packages
and can’t be used for design purposes. These values were
calculated in accordance with JESD51-7 and simulated on a
specified JEDEC board. They do not represent the
performance obtained in an actual application.
6) Measure on MPS standard EVB of MPQ4425B, 4-layer PCB,
64mmx64mm.
MPQ4425B Rev. 1.0
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4
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
ELECTRICAL CHARACTERISTICS
VIN = 12V, VEN = 2V, TJ = -40°C to +125°C, TJ = 25°C, unless otherwise noted.
Parameter
Supply current (shutdown)
Supply current (quiescent)
HS switch on resistance
LS switch on resistance
Switch leakage
Current limit (7)
Reverse current limit
Oscillator frequency
Maximum duty cycle
Minimum on time (7)
Feedback voltage
Feedback current
EN rising threshold
EN falling threshold
EN threshold hysteresis
EN input current
EN turn-off delay
VIN under-voltage lockout
rising threshold
VIN under-voltage lockout
falling threshold
VIN under-voltage lockout
threshold hysteresis
Over-voltage detection
(/FAULT pulled low)
Over-voltage detection
hysteresis
/FAULT delay
/FAULT sink current
capability
/FAULT leakage current
Symbol
IIN
IQ
Condition
Min
Typ
HSRDS-ON
VEN = 0V
VEN = 2V, VFB = 1V, no switching
VBST-SW = 5V
12
0.6
85
LSRDS-ON
SW LKG
ILIMIT
VCC = 5V
VEN = 0V, VSW = 12V
Under 40% duty cycle
50
3.6
VFB = 100mV
VFB = 100mV
300
92
fSW
DMAX
tON_MIN
VFB
IFB
VEN_RISING
VEN_FALLING
VEN_HYS
IEN
TJ = 25°C
TJ = -40°C to +125°C
VFB = 250mV
192
184
1.1
0.7
VEN = 2V
5.7
3.5
400
95
Max
Units
1
150
μA
mA
mΩ
105
2
7.8
500
mΩ
μA
A
A
kHz
%
46
200
200
30
1.45
1
450
ns
208
216
100
1.8
1.3
5
10
μA
mV
nA
V
V
mV
ENtd-off
10
0
25
0.2
50
μA
ms
INUVVth
3.2
3.5
3.8
V
2.8
3.1
3.5
V
VEN = 0
INUVHYS
400
mV
FTVth-Hi
140%
VFB
20%
VFB
10
μs
FTTd
VFT
Sink 4mA
IFT-LEAK
VCC regulator
VCC load regulation
VCC
Soft-start time (7)
tSS
ICC = 0mA
ICC = 5mA
ILED = 1.5A, L = 6.8μH, load = 2
series LED, ILED from 10% to
90%
Thermal shutdown (7)
Thermal hysteresis (7)
4.6
150
4.9
1.5
0.4
V
100
nA
5.2
4
V
%
0.9
ms
170
30
°C
°C
Note:
7) Derived from bench characterization. Not tested in production.
MPQ4425B Rev. 1.0
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9/9/2019
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© 2019 MPS. All Rights Reserved.
5
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL CHARACTERISTICS
Quiescent Current vs.
Temperature
24
0.9
20
0.8
16
0.7
IQ (mA)
ISHDN (μA)
Shutdown Current vs.
Temperature
12
0.6
8
0.5
4
0.4
0.3
0
-50 -30 -10 10
30
50
70
-50 -30 -10 10 30 50 70 90 110 130
TEMPERATURE (oC)
90 110 130
TEMPERATURE ( C)
VIN UVLO Threshold vs.
Temperature
Switching Frequency vs.
Temperature
3.8
403
3.6
402
401
fsw (kHz )
VIN_UVLO (V)
3.4
3.2
3
2.8
Rising
2.6
400
399
398
Falling
397
2.4
-50 -30 -10
10
30
50
70
-50 -30 -10 10
90 110 130
TEMPERATURE ( C)
HS-FET On Resistance vs.
Temperature
50
70
90 110 130
LS-FET On Resistance vs.
Temperature
140
90
120
80
RON_LS (mΩ)
RON_HS (mΩ)
30
TEMPERATURE (oC)
o
100
80
60
70
60
50
40
30
40
-50 -30 -10 10
30
50
70
o
TEMPERATURE ( C)
90 110 130
-50 -30 -10 10
30
50
70
90 110 130
o
TEMPERATURE ( C)
MPQ4425B Rev. 1.0
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6
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL CHARACTERISTICS (continued)
Reverse Current Limit vs.
Temperature
7.0
5.0
6.5
4.5
I LIMIT_REVERSE (A)
I LIMIT_HS (A)
Current Limit vs.
Temperature
6.0
5.5
5.0
4.0
3.5
3.0
2.5
4.5
2.0
4.0
-50 -30 -10 10
30
50
70
o
TEMPERATURE ( C)
90 110 130
-50 -30 -10 10
30
50
70
90 110 130
TEMPERATURE (oC)
MPQ4425B Rev. 1.0
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VLED+ - VLED- = 2 x 3.2V @ ILED = 1.5A, L = 10μH, fSW = 400kHz, with EMI filters, TA = 25°C,
unless otherwise noted.
CISPR25 Class 5 Average Conducted Emissions
150kHz to 108MHz
150kHz to 108MHz
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
CISPR25 CLASS 5 LIMITS
AVERAGE CONDUCTED EMI (dBµV)
PEAK CONDUCTED EMI (dBµV)
CISPR25 Class 5 Peak Conducted Emissions
NOISE FLOOR
Frequency (MHz)
1
0.1
108
10
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
CISPR25 CLASS 5 LIMITS
NOISE FLOOR
Frequency (MHz)
1
0.1
108
10
CISPR25 Class 5 Peak Radiated Emissions
CISPR25 Class 5 Average Radiated Emissions
150kHz to 30MHz
150kHz to 30MHz
60
60
55
55
AVERAGE RADIATED EMI (dBµV/m)
PEAK RADIATED EMI (dBµV/m)
50
CISPR25 CLASS 5 LIMITS
50
45
40
35
30
25
20
15
10
NOISE FLOOR
5
0
45
40
35
CISPR25 CLASS 5 LIMITS
30
25
20
15
10
5
0
-5
NOISE FLOOR
-5
-10
1
0.1
-10
30
Frequency (MHz)
Frequency (MHz)
1
0.1
30
CISPR25 Class 5 Peak Radiated Emissions
CISPR25 Class 5 Average Radiated Emissions
Horizontal, 30MHz to 200MHz
Horizontal, 30MHz to 200MHz
55
55
HORIZONTAL POLARIZATION
PEAK RADIATED EMI (dBµV/m)
45
CISPR25 CLASS 5 LIMITS
40
35
30
25
20
15
10
NOISE FLOOR
5
HORIZONTAL POLARIZATION
50
AVERAGE RADIATED EMI (dBµV/m)
50
45
40
35
30
25
CISPR25 CLASS 5 LIMITS
20
15
10
5
0
0
-5
30
40
50
60
70
80
90
100 110 120
Frequency (MHz)
130
140
150
160
170
180
190
200
NOISE FLOOR
-5
30
40
50
60
70
80
90
100 110 120
Frequency (MHz)
130
140
150
MPQ4425B Rev. 1.0
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160
170
180
190
200
8
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VLED+ - VLED- = 2 x 3.2V @ ILED = 1.5A, L = 10μH, fSW = 400kHz, with EMI filters, TA = 25°C,
unless otherwise noted.
CISPR25 Class 5 Peak Radiated Emissions
CISPR25 Class 5 Average Radiated Emissions
Vertical, 30MHz to 200MHz
Vertical, 30MHz to 200MHz
55
55
VERTICAL POLARIZATION
PEAK RADIATED EMI (dBµV/m)
45
CISPR25 CLASS 5 LIMITS
40
35
30
25
20
15
10
NOISE FLOOR
5
VERTICAL POLARIZATION
50
AVERAGE RADIATED EMI (dBµV/m)
50
45
40
35
30
25
CISPR25 CLASS 5 LIMITS
20
15
10
5
0
0
-5
30
40
50
60
70
80
90
100 110 120
Frequency (MHz)
130
140
150
160
170
180
190
NOISE FLOOR
-5
200
30
40
50
60
70
80
90
100 110 120
Frequency (MHz)
130
140
150
160
170
180
190
200
CISPR25 Class 5 Peak Radiated Emissions
CISPR25 Class 5 Average Radiated Emissions
Horizontal, 200MHz to 1GHz
Horizontal, 200MHz to 1GHz
55
55
HORIZONTAL POLARIZATION
50
AVERAGE RADIATED EMI (dBµV/m)
PEAK RADIATED EMI (dBµV/m)
45
40
CISPR25 CLASS 5 LIMITS
35
30
25
20
15
10
HORIZONTAL POLARIZATION
50
NOISE FLOOR
5
45
40
35
30
25
CISPR25 CLASS 5 LIMITS
20
15
10
5
0
0
-5
200
300
400
500
600
Frequency (MHz)
700
800
900
NOISE FLOOR
-5
1000
200
300
400
500
600
Frequency (MHz)
700
800
900
1000
CISPR25 Class 5 Peak Radiated Emissions
CISPR25 Class 5 Average Radiated Emissions
Vertical, 200MHz to 1GHz
Vertical, 200MHz to 1GHz
55
55
VERTICAL POLARIZATION
50
AVERAGE RADIATED EMI (dBµV/m)
PEAK RADIATED EMI (dBµV/m)
45
40
CISPR25 CLASS 5 LIMITS
35
30
25
20
15
10
VERTICAL POLARIZATION
50
NOISE FLOOR
5
45
40
35
30
25
CISPR25 CLASS 5 LIMITS
20
15
10
5
0
0
-5
200
300
400
500
600
Frequency (MHz)
700
800
900
1000
NOISE FLOOR
-5
200
300
400
500
600
Frequency (MHz)
700
MPQ4425B Rev. 1.0
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9/9/2019
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800
900
1000
9
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Efficiency vs. Input Voltage
Efficiency vs. Input Voltage
VLED = 3.2V
VLED = 6.4V
90
96
88
94
86
92
EFFICIENCY (%)
EFFICIENCY (%)
VIN = 12V, VLED+ - VLED- = 2 x 3.2V @ ILED = 1.5A, L = 10μH, fSW = 400kHz, with EMI filters, TA = 25°C,
unless otherwise noted.
84
82
ILED=1.5A
ILED=1A
ILED=0.8A
ILED=0.5A
80
78
90
88
ILED=1.5A
86
ILED=1A
ILED=0.8A
84
ILED=0.5A
82
76
8
12
16
20
24
28
32
36
INPUT VOLTAGE (V)
8
12
16
20
24
28
32
36
INPUT VOLTAGE (V)
Current Limit vs. Duty
6
CURRENT LIMIT (A)
5.5
5
4.5
4
3.5
3
2.5
2
0
10
20
30
40
50
60
70
80
90
DUTY (%)
MPQ4425B Rev. 1.0
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VLED+ - VLED- = 2 x 3.2V @ ILED = 1.5A, L = 10μH, fSW = 400kHz, with EMI filters, TA = 25°C,
unless otherwise noted.
Steady State
Start-Up through VIN
ILED = 1.5A
ILED = 1.5A
CH2: VOUT
5V/div.
CH3: VIN
5V/div.
CH2: VOUT
5V/div.
CH1: VSW
10V/div.
CH3: ILED
1A/div.
R1: V/FAULT
2V/div.
CH1: VSW
10V/div.
R1: IL
1A/div.
CH4: IL
1A/div.
CH4: ILED
1A/div.
2μs/div.
1ms/div.
Shutdown through VIN
Start-Up through EN
ILE D = 1.5A
ILED = 1.5A
CH3:
VEN/DIM
2V/div.
CH2: VOUT
5V/div.
CH1: VSW
10V/div.
CH3: VIN
5V/div.
CH2: VOUT
5V/div.
CH1: VSW
10V/div.
R1: IL
1A/div.
R1: IL
1A/div.
CH4: ILED
1A/div.
CH4: ILED
1A/div.
10ms/div.
1ms/div.
Shutdown through EN
PWM Dimming
ILED = 1.5A
F_PWM = 200Hz
CH3: VEN/DIM
2V/div.
CH2: VOUT
5V/div.
CH1: VSW
10V/div.
CH3:
VEN/DIM
2V/div.
CH2:
V/FAULT
5V/div.
CH1: VSW
10V/div.
CH4: ILED
2A/div.
CH4: ILED
2A/div.
R1: IL
1A/div.
R1: IL
2A/div.
4μs/div.
2ms/div.
MPQ4425B Rev. 1.0
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9/9/2019
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© 2019 MPS. All Rights Reserved.
11
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VLED+ - VLED- = 2 x 3.2V @ ILED = 1.5A, L = 10μH, fSW = 400kHz, with EMI filters, TA = 25°C,
unless otherwise noted.
PWM Dimming
LED Open Steady State
F_PWM = 2kHz
CH3:
V/FAULT
2V/div.
CH2: VOUT
5V/div.
CH3: VEN/DIM
2V/div.
CH2: V/FAULT
5V/div.
CH1: VSW
10V/div.
CH1: VSW
5V/div.
CH4: ILED
2A/div.
CH4: IL
200mA/div.
R1: IL
2A/div.
200μs/div.
2μs/div.
LED Open Input Power-On
LED Open Input Power-Off
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH2: VOUT
5V/div.
CH2: VOUT
5V/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
1ms/div.
10ms/div.
LED Open EN On
LED Open EN Off
CH3:
VEN/DIM
2V/div.
CH3: VEN/DIM
2V/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
CH2: VOUT
5V/div.
CH4: IL
1A/div.
CH2: VOUT
5V/div.
CH4: IL
1A/div.
400μs/div.
4μs/div.
MPQ4425B Rev. 1.0
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12
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VLED+ - VLED- = 2 x 3.2V @ ILED = 1.5A, L = 10μH, fSW = 400kHz, with EMI filters, TA = 25°C,
unless otherwise noted.
LED Open Entry
LED Open Recovery
ILED = 1.5A
ILED = 1.5A
CH3: ILED
1A/div.
CH3: ILED
5A/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
CH2: V/FAULT
5V/div.
CH2:
V/FAULT
5V/div.
CH4: IL
2A/div.
CH4: IL
2A/div.
20μs/div.
40μs/div.
LED + Short to GND Steady State
LED + Short to GND Input Power-On
CH3: VFAULT
5V/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
CH2: VOUT
5V/div.
CH2:
V/FAULT
5V/div.
CH4: IL
2A/div.
CH4: IL
5A/div.
10μs/div.
1ms/div.
LED + Short to GND Input PowerOff
LED + Short to GND En On
CH3:
VEN/DIM
2V/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH2: V/FAULT
5V/div.
CH1: VSW
5V/div.
CH2:
V/FAULT
5V/div.
CH4: IL
5A/div.
CH4: IL
5A/div.
10ms/div.
1ms/div.
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13
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VLED+ - VLED- = 2 x 3.2V @ ILED = 1.5A, L = 10μH, fSW = 400kHz, with EMI filters, TA = 25°C,
unless otherwise noted.
LED + Short to GND En Off
LED + Short to GND Entry
ILED = 1.5A
CH3: ILED
1A/div.
CH3: VEN/DIM
2V/div.
CH2: V/FAULT
5V/div.
CH2:
V/FAULT
5V/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
CH4: IL
5A/div.
CH4: IL
5A/div.
100μs/div.
40μs/div.
LED + Short to GND Recovery
LED + Short to LED- Entry
ILED = 1.5A
ILED = 1.5A
CH3: ILED
1A/div.
CH2:
V/FAULT
5V/div.
CH3: ILED
2A/div.
CH2: V/FAULT
5V/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
CH4: IL
2A/div.
CH4: IL
5A/div.
100μs/div.
10μs/div.
LED + Short to LED- Recovery
ILED = 1.5A
CH3: ILED
1A/div.
CH2: V/FAULT
5V/div.
CH1: VSW
5V/div.
CH4: IL
2A/div.
20μs/div.
MPQ4425B Rev. 1.0
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14
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
FUNCTIONAL BLOCK DIAGRAM
IN
VCC
Regula tor
VCC
RSEN
Current-Se ns e
Amplif er
Boot strap
Regula tor
Os cillator
HS
Drive r
Com parato r
On Time Con tr ol
Logic Contro l
1 pF
EN/DIM
Refe re nc e
6.5V
FB
56pF
300k
BST
SW
VCC
Current Lim it
Comparator
LS
Drive r
400k
20k
Error Amplifier
AGND
/FAULT
PGND
Figure 1: Functional Block Diagram
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
OPERATION
The
MPQ4425B
is
a
high-frequency,
synchronous, rectified, step-down, switch-mode
white LED driver with built-in power MOSFETs.
It offers a compact solution to achieve 1.5A of
continuous output current with excellent load and
line regulation over a 4V to 36V input supply
range.
The device operates in a fixed-frequency, peak
current control mode to regulate the output
current. An internal clock initiates a PWM cycle.
The integrated high-side power MOSFET turns
on and remains on until its current reaches the
value set by the COMP voltage (VCOMP). When
the power switch is off, it remains off until the
next clock cycle starts. If the power MOSFET’s
current does not reach the value set by VCOMP
within 95% of one PWM period, the power
MOSFET turns off.
Internal Regulator
The 4.9V internal regulator powers most of the
internal circuitries. This regulator takes the VIN
input and operates in the full VIN range. When VIN
exceeds 4.9V, the regulator’s output is in full
regulation. When VIN falls below 4.9V, the output
decreases following VIN. A 0.1µF decoupling
ceramic capacitor is required at the pin.
CCM Operation
Continuous conduction mode (CCM) ensures
that the part works with a fixed frequency from a
no-load to a full-load range. An advantage of
CCM is its controllable frequency and lower
output ripple at light load.
Frequency Foldback
Frequency foldback initiates during soft start and
short-circuit protection.
Error Amplifier (EA)
The error amplifier compares the FB pin voltage
to the internal 0.2V reference (VREF), and outputs
a current proportional to the difference between
the two values. This output current charges or
discharges the internal compensation network to
form VCOMP, which controls the power MOSFET
current. The optimized internal compensation
network minimizes the external component
counts and simplifies the control loop design.
Enable Control (EN)
EN/DIM is a control pin that turns the regulator
on and off. Drive EN/DIM high to turn on the
regulator; drive EN/DIM low to turn it off. An
internal resistor from EN/DIM to GND allows
EN/DIM to be floated and shut down the chip.
EN/DIM is clamped internally using a 6.5V series
Zener diode (see Figure 2). Connecting the
EN/DIM input through a pull-up resistor to the
voltage on VIN limits the EN input current below
100µA. For example, with 12V connected to VIN,
RPULLUP ≥ (12V - 6.5V) ÷ 100µA = 55kΩ.
Directly connecting EN/DIM to a voltage source
without a pull-up resistor requires limiting the
amplitude of the voltage source to ≤6V to prevent
damage to the Zener diode.
EN
Zener
6.5V typ
EN LOGIC
GND
Figure 2: 6.5V Zener Diode Connection
If EN/DIM is driven low for longer than 25ms, the
IC shuts down.
PWM Dimming
Apply an external 100Hz to 2kHz PWM
waveform to the EN/DIM pin for PWM dimming.
The average LED current is proportional to the
PWM duty. The minimum amplitude of the PWM
signal is 1.8V. If a dimming signal is applied
before the chip starts up, the dimming signal’s on
time must be longer than 2ms to ensure soft start
finishes and the output current can be built. If a
dimming signal is applied after soft start finishes,
the 2ms time limit is not required.
Under-Voltage Lockout (UVLO)
Under-voltage lockout (UVLO) protects the chip
from operating at an insufficient supply voltage.
The UVLO comparator monitors the output
voltage of the internal regulator (VCC).
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
Internal Soft Start (SS)
The soft start (SS) prevents the converter output
voltage from overshooting during start-up. When
the chip starts up, the internal circuitry generates
a soft-start voltage (VSS). When VSS is below the
internal reference (VREF), VSS overrides VREF, and
the error amplifier uses VSS as the reference.
When VSS exceeds VREF, the error amplifier uses
VREF as the reference.
Fault Indicator
The MPQ4425B has fault indication. The
/FAULT pin is the open drain of a MOSFET. It
should be connected to VCC or another voltage
source through a resistor (e.g. 100kΩ). The
/FAULT pin is pulled high at normal operation,
but during LED short circuit, open circuit, or
thermal shutdown, it is pulled down to indicate a
fault status.
Over-Current Protection (OCP)
The device has cycle-by-cycle, peak current limit
protection with valley-current detection. The
inductor current is monitored during the highside MOSFET (HS-FET) on state. If the inductor
current exceeds the current limit value set by the
COMP high-clamp voltage, the HS-FET turns off.
The low-side MOSFET (LS-FET) turns on to
discharge the energy, and the inductor current
decreases.
Even though the internal clock pulses high, the
HS-FET remains off unless the inductor valley
current falls below a certain current threshold
(the valley current limit). If the inductor current
does not drop below the valley current limit when
the internal clock pulses high, the HS-FET
misses the clock, and the switching frequency
decreases to half the nominal value. The peak
and valley current limits keep the inductor
current from running away during an overload or
short-circuit condition.
Thermal Shutdown (TSD)
Thermal shutdown prevents the chip from
operating at high temperatures. When the die
temperature exceeds 170°C, the entire chip
shuts down. When the temperature drops below
its lower threshold (typically 140°C), the chip
turns on.
Floating Driver and Bootstrap Charging
An external bootstrap capacitor powers the
floating power MOSFET driver. This floating
driver has its own UVLO protection, with a rising
threshold of 2.2V and hysteresis of 150mV. The
bootstrap capacitor voltage is regulated
internally by VIN through D1, M1, C3, L1, and C4
(see Figure 3).
If VIN - VSW exceeds 5V, U1 regulates M1 to
maintain a 5V BST voltage across C4. As long
as VIN is sufficiently higher than SW, the
bootstrap capacitor can be charged.
When the HS-FET is on, VIN ≈ VSW, so the
bootstrap capacitor cannot be charged. When
the LS-FET is on, VIN - VSW reaches its maximum
for fast charging. When there is no inductor
current, VSW = VOUT, so the difference between
VIN and VOUT can charge the bootstrap capacitor.
It is recommended to place a 20Ω resistor
between the SW and BST capacitors to reduce
SW spike voltage.
Figure 3: Internal Bootstrap Charging Circuit
Start-Up and Shutdown
If VIN and EN exceed their thresholds, the chip
starts up. The reference block starts first,
generating a stable reference voltage and
current, and then the internal regulator is
enabled. The regulator provides a stable supply
for the remaining circuitries.
Three events can shut down the chip: VIN low,
EN low, and thermal shutdown. During the
shutdown procedure, the signaling path is first
blocked to avoid any fault triggering. VCOMP and
the internal supply rail are then pulled down. The
floating driver is not subject to this shutdown
command.
MPQ4425B Rev. 1.0
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
APPLICATION INFORMATION
Setting the Output Current
The output current is set by the external resistor
RFB (see Figure 4).
Since CIN absorbs the input switching current, it
requires an adequate ripple current rating. The
RMS current in the input capacitor can be
estimated with Equation (2):
LED+
SW
ICIN ILED
RT
FB
RFB
LED-
Figure 4: Feedback Network
When the feedback reference voltage is 0.2V,
ILED can be calculated with Equation (1):
I LED
0.2V
R FB
(1)
RT sets the loop bandwidth, and a lower RT
correlates with a higher bandwidth. However, a
high bandwidth may lead to an insufficient phase
margin, resulting in an unstable loop. An optimal
RT value is required to make a tradeoff between
the bandwidth and phase margin. Table 1 lists
the recommended feedback resistor and RT
values for common output with a 1 or 2 series
LED.
Table 1: Resistor Selection for Common Output
ILED (A)
RFB (mΩ)
RT (kΩ)
0.5
400 (1%)
200
1
200 (1%)
150
1.5
133 (1%)
100
Selecting the Input Capacitor
The step-down converter has a discontinuous
input current, and it requires a capacitor to
supply the AC current to the converter to
maintain the DC input voltage. For optimal
performance, use low-ESR capacitors. Ceramic
capacitors with X5R or X7R dielectrics are
recommended due to their low ESR and small
temperature coefficients.
For most applications, use a 4.7µF to 10µF
capacitor. It is recommended to use another,
lower-value capacitor (e.g. 0.1µF) with a small
package size (0603) to absorb high-frequency
switching noise. Place the secondary capacitor
as close to the IN and GND pins as possible.
VOUT
V
(1 OUT )
VIN
VIN
(2)
The worst-case condition occurs at VIN = 2VOUT,
calculated with Equation (3):
I
(3)
ICIN LED
2
Choose an input capacitor with an RMS current
rating greater than half the maximum load
current.
The input capacitor can be electrolytic, tantalum,
or ceramic. When using electrolytic or tantalum
capacitors, add a small, high-quality ceramic
capacitor (e.g. 0.1μF) as close to the IC as
possible. When using ceramic capacitors,
ensure that they have enough capacitance to
provide a sufficient charge to prevent excessive
voltage ripple at the input. The input voltage
ripple caused by the capacitance can be
estimated with Equation (4):
VIN
V
V
ILED
OUT (1 OUT )
fSW CIN VIN
VIN
(4)
Selecting the Output Capacitor
The output capacitor maintains the DC output
voltage. Use ceramic, tantalum, or low-ESR
electrolytic capacitors. Use low-ESR capacitors
to maintain low output voltage ripple. The output
voltage ripple can be estimated with Equation
(5):
VOUT
VOUT
V
1
(1 OUT ) (RESR
) (5)
fSW L
VIN
8fSW COUT
Where L is the inductor value, and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
For ceramic capacitors, the capacitance
dominates the impedance at the switching
frequency. The capacitance causes the majority
of the output voltage ripple.
MPQ4425B Rev. 1.0
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
The output voltage ripple can be estimated with
Equation (6):
VOUT
VOUT
V
(1 OUT ) (6)
8 fSW L COUT
VIN
2
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be estimated with Equation (7):
VOUT
VOUT
V
(1 OUT ) RESR
fSW L
VIN
VIN UVLO Setting
The MPQ4425B has an internal, fixed undervoltage lockout (UVLO) threshold. The rising
threshold is about 3.5V, while the falling
threshold is about 3.1V. If the application
requires a higher UVLO point, place an external
resistor divider between the IN and EN/DIM pins
to raise the equivalent UVLO threshold (see
Figure 5).
VIN
IN
(7)
RUP
EN/DIM
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MPQ4425B can be optimized for a wide range of
capacitance and ESR values.
Selecting the Inductor
For most applications, a 4.7µH to 22µH inductor
with a DC current rating at least 25% higher than
the maximum load current is recommended. For
higher efficiency, choose an inductor with a
lower DC resistance. A larger-value inductor
results in less ripple current and a lower output
ripple voltage. However, inductors with a larger
value inductor also have a larger physical size,
higher series resistance, and lower saturation
current. To determine the inductor value, set the
inductor ripple current to about 30% of the
maximum load current. The inductance value
can be then be calculated with Equation (8):
L
VOUT
V
(1 OUT )
fSW IL
VIN
(8)
Where ∆IL is the peak-to-peak inductor ripple
current.
Make the inductor ripple current about 30% of
the maximum load current. The maximum
inductor peak current can be calculated with
Equation (9):
ILP ILED
VOUT
V
(1 OUT )
2fSW L
VIN
RDOWN
400kΩ
Figure 5: Adjustable UVLO using EN divider
The UVLO threshold can be calculated with
Equation (10) and Equation (11):
INUVRISING (1
RUP
) VEN_RISING
400k //RDOWN
(10)
INUVFALLING (1
RUP
) VEN_FALLING
400k //RDOWN
(11)
Where VEN_RISING = 1.45V, VEN_FALLING = 1V. When
choosing RUP, ensure it is high enough to limit
the current flow into the EN/DIM pin to less than
100μA.
BST Resistor and External BST Diode
A 20Ω resistor is recommended in series with the
BST capacitor to reduce the SW spike voltage.
Higher resistance improves SW spike reduction,
but compromises efficiency.
An external BST diode enhances the regulator’s
efficiency when the duty cycle is high (>65%). A
power supply (typically VCC or VOUT) between
2.5V and 5V can power the external bootstrap
diode (see Figure 6).
(9)
MPQ4425B Rev. 1.0
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
VCC
External BST Diode
IN4148
BST
VCC/
VOUT
RBST
Top Layer
CBST
SW
L
VOUT
COUT
Figure 6: Optional External Bootstrap Diode to
Enhance Efficiency
The recommended external BST diode is
IN4148, and the recommended BST capacitor
value is 0.1µF to 1μF.
PCB Layout Guidelines
Efficient PCB layout is critical for stable
operation, especially for input capacitor
placement. For better thermal performance, a 4layer layout is recommended. For best results,
refer to Figure 7 and Figure 8. and follow the
guidelines below: (8) (9)
1.
Connect directly to PGND using a large
ground plane. If the bottom layer is a ground
plane, add vias near PGND.
2.
Ensure that the high-current paths at PGND
and IN have short, direct, and wide traces.
3.
Place the ceramic input capacitor, especially
the small package (0603) input bypass
capacitor, as close to the IN and PGND pins
as possible to minimize high-frequency
noise.
4.
Keep the connection between the input
capacitor and IN as short and wide as
possible.
5.
Place the VCC capacitor as close as
possible to the VCC and GND pins.
6.
Route SW and BST away from sensitive
analog areas, such as FB.
7.
Place the feedback resistors close to the
chip to keep the trace connecting to the FB
pin as short as possible.
8.
Use multiple vias to connect the power
planes to internal layers.
Inner Layer 1
Inner Layer 2
Bottom Layer
Figure 7: Recommended PCB Layout for QFN
Package (8)
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
Top Layer
Inner Layer 1
Inner Layer 2
Bottom Layer
Figure 8: Recommended PCB Layout for
TSOT23-8 Package (9)
Notes:
8) The recommended layout is based on Figure 9.
9) The recommended layout is based on Figure 12.
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL APPLICATION CIRCUITS
VIN
U1
4V to 36V
GND
1, 2
R1
499k
C1A
10μF
50V
C1B
10μF
50V
C1C
0.1μF
50V
R2
10
20
C3
0.1μF
L1
MPQ4425BGQB
5
EN/DIM
BST
IN
7
EN/DIM
SW
PGND
VCC
9
ILED = 1.5A
C4
10μF
16V
10μH
LED+
11,12,13
C2
0.1μF
R7
100k
4
R3
FB 6
/FAULT
AGND
LED-
100k
R4
400m
1206
8
/FAULT
R6
400m
1206
R5
400m
1206
Figure 9: ILED = 1.5A Application Circuit of QFN-13 Package
4V to 36V
VIN
VEMI
FB1
L1
BLM41PG181SN1L 2.2µH
CIN2
CIN3
CIN4
CIN1
1nF 10nF 1µF
10µF
50V 50V 50V
50V
GND
C1A C1B C1C1, 2
10µF 10µF 0.1µF
47µF
63V R1 50V 50V 50V
U1
CIN5
BST
IN
MPQ4425BGQB
499k
5
EN/DIM
7
EN/DIM
SW
PGND
VCC
10
R2
20
C3
0.1µF/16V
9
L2
10µH
ILED = 1.5A
C4
10µF/16V
LED+
11,12,13
C2
R7
100k
4
/FAULT
AGND
8
/FAULT
0.1µF/16V
FB
6
R3
100k
LEDR4
400m
R5
400m
R6
400m
Figure 10: ILED = 1.5A Application Circuit of QFN-13 with EMI Filters
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MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
TYPICAL APPLICATION CIRCUITS (continued)
VIN
U1
4V to 36V
GND
2
R1
499k
C1A
10μF
50V
C1B
10μF
50V
C1C
0.1μF
50V
5
R2
20
C3
0.1μF
L1
MPQ4425BGJ
6
EN/DIM
BST
IN
7
EN/DIM
VCC
SW
PGND
3
ILED = 1.5A
C4
10μF
16V
10μH
LED+
4
C2
0.1μF
R7
100k
1 /FAULT
/FAULT
FB 8
R3
LED-
100k
R6
R5
R4
400m
400m
400m
1206
1206
1206
Figure 11: ILED = 1.5A Application Circuit with TSOT23-8 Package
4V to 36V
VIN
VEMI
FB1
BLM41PG181SN1L L1
CIN4 2.2µH
CIN1 CIN2 CIN3
1nF 10nF 1µF
10µF
50V 50V 50V
50V
GND
EN/DIM
C1A C1B C1C 2
10µF 10µF 0.1µF
47µF
50V 50V 50V
63V
R1
499k
6
U1
CIN5
7
IN
BST
MPQ4425BGJ
EN/DIM
VCC
SW
PGND
5
R2
20
C3
0.1µF/16V
3
L2
10µH
ILED = 1.5A
C4
10µF/16V
LED+
4
C2
R7
100k
/FAULT
0.1µF/16V
1
/FAULT
FB
8
R3
100k
LEDR4
R5
R6
400m
400m
400m
Figure 12: ILED = 1.5A Application Circuit of TSOT23-8 with EMI Filters
MPQ4425B Rev. 1.0
www.MonolithicPower.com
9/9/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
23
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
PACKAGE INFORMATION
TSOT23-8
See note 7
EXAMPLE
TOP MARK
PIN 1 ID
IAAAA
RECOMMENDED LAND PATTERN
TOP VIEW
SEATING PLANE
SEE DETAIL ''A''
FRONT VIEW
SIDE VIEW
NOTE:
DETAIL ''A''
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD
FLASH, PROTRUSION, OR GATE BURR.
3) PACKAGE WIDTH DOES NOT INCLUDE
INTERLEAD FLASH OR PROTRUSION.
4) LEAD COPLANARITY (BOTTOM OF LEADS
AFTER FORMING) SHOULD BE 0.10 MILLIMETERS
MAX.
5) JEDEC REFERENCE IS MO-193, VARIATION BA.
6) DRAWING IS NOT TO SCALE.
7) PIN 1 IS THE LOWER LEFT PIN WHEN READING
TOP MARK FROM LEFT TO RIGHT (SEE EXAMPLE
TOP MARK).
MPQ4425B Rev. 1.0
www.MonolithicPower.com
9/9/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
24
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
PACKAGE INFORMATION (continued)
QFN-13 (2.5mmx3mm)
PIN 1 ID
MARKING
PIN 1 ID
0.15X45º TYP
PIN 1 ID
INDEX AREA
BOTTOM VIEW
TOP VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) LEAD COPLANARITY SHOULD BE 0.10
MILLIMETERS MAX.
3) JEDEC REFERENCE IS MO-220.
4) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
MPQ4425B Rev. 1.0
www.MonolithicPower.com
9/9/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
25
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
PACKAGE INFORMATION (continued)
QFN-13 (2.5mmx3mm)
Wettable Flank
PIN 1 ID
MARKING
PIN 1 ID
0.15X45º TYP
PIN 1 ID
INDEX AREA
TOP VIEW
BOTTOM VIEW
SIDE VIEW
SECTION A-A
NOTE:
0.15X45º
1) THE LEAD SIDE IS WETTABLE.
2) ALL DIMENSIONS ARE IN MILLIMETERS.
3) LEAD COPLANARITY SHOULD BE 0.08
MILLIMETERS MAX.
4) JEDEC REFERENCE IS MO-220.
5) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
MPQ4425B Rev. 1.0
www.MonolithicPower.com
9/9/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
26
MPQ4425B – 36V, 1.5A, SYNCHRONOUS STEP-DOWN LED DRIVER
CARRIER INFORMATION
QFN-13 (2.5mmx3mm)
TSOT23-8
Package
Description
Quantity/Reel
Quantity/Tube
Reel
Diameter
Carrier
Tape
Width
Carrier
Tape
Pitch
5000
N/A
13in
12mm
8mm
MPQ4425BGQBE
QFN-13
(2.5mmx3mm)
MPQ4425BGJ
TSOT23-8
5000
N/A
13in
12mm
8mm
Part Number
MPQ4425BGQB
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.
MPQ4425B Rev. 1.0
www.MonolithicPower.com
9/9/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
27
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