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MP3388SGR-Z

P1-P3P4-P6P7-P9P10-P12P13-P15
MP3388S
55V, 8-String, Step-Up, White LED Driver
MP3388S Rev.1.02 www.MonolithicPower.com 1
9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP3388S is a step-up converter with 8
current-source channels designed to drive arrays
of white LED for LCD-panel backlighting
applications.
The MP3388S uses current-mode,
fixed-frequency architecture, and users can select
a switching frequency of either 625kHz or
1.25MHz. It generates an output voltage up to
55V from a 4.3V-to-25V input supply. The
MP3388S independently regulates the current in
each LED string set by an external current setting
resistor to a user-programmed value.
The MP3388S applies an internal current source
to each LED string terminal, and can achieve a
current balance of 2.5% regulation accuracy
between strings. Its low 600mV regulation voltage
on LED current sources reduces power loss and
improves efficiency.
The MP3388S features external PWM dimming or
DC-input PWM dimming, which allows for flexible
backlight luminance control. The dimming PWM
signal can be generated internally, and the
dimming frequency is programmed by an external
setting capacitor.
FEATURES
High Efficiency
Compact Size
4.3V-to-25V Input Voltage Range
55V Maximum Step-Up Voltage
Balanced Driver for 8 WLED Strings
2.5% Current-Matching Accuracy between
Strings
Selectable Switching Frequency of 625kHz
or 1.25MHz
PWM or DC Input-Burst PWM Dimming
Programmable Over-Voltage Protection
Under-Voltage Lockout
Open- and Short-LED Protection
Thermal Shutdown
Small QFN24 (4mm × 4mm) Package
APPLICATIONS
Notebook PCs
Tablet Computers
Small LCD TV
Handheld Terminal Displays
Automotive Electronics Equipments
A
ll MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithi
c
Power Systems, Inc.
TYPICAL APPLICATION
VIN
MP3388S
Enable
NC
C5
C3
VCC VIN COMPVFAULT SW1 SW2
PGND1
PGND2
OVP
LED1
LED2
LED3
LED4ISETLED5LED6LED7LED8
PWMI
GND
PWMO
FPWM
OSC
EN
C1
M1
L1
D1
C2
R1
R2
C4
R
SET
V
OUT
C6
DIMMING
4.5V-25V
PWM
MP3388S—55V, 8-STRING, STEP-UP, WHITE LED DRIVER
MP3388S Rev.1.02 www.MonolithicPower.com 2
9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number Package Top Marking
MP3388SGR*
QFN24 (4x4mm)
M3388S
* For Tape & Reel, add suffix –Z (e.g. MP3388SGR–Z).
PACKAGE REFERENCE
TOP VIEW
1
2
3
4
5
6
18
17
16
15
14
13
EN
OSC
FPWM
PWMO
GND
PWMI
Exposed Pad
Connect to GND
PGND1
PGND2
OVP
LED1
LED2
LED3
LED8
LED7
LED6
LED5
ISET
LED4
VCC
VIN
COMP
SW1
SW2
VFAULT
7 8 9 10 11 12
24 23 22 21 20 19
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
................................................. -0.3V to +30V
V
VFAULT
........................................... V
IN
–6V to V
IN
V
SW
, V
LED1
to V
LED8
............................ -1V to +55V
All Other Pins .................................. -0.3V to +6V
Continuous Power Dissipation ... (T
A
= +25°C)
(2)
QFN24(4mm×4mm) ................................... 2.9W
Junction Temperature ............................... 150°C
Lead Temperature .................................... 260°C
Storage Temperature ............... -65°C to +150°C
Recommended Operating Conditions
(3)
Supply Voltage V
IN
........................... 4.3V to 25V
Operating Junction Temp. (T
J
). -40°C to +125°C
Thermal Resistance
(4)
θ
JA
θ
JC
QFN24 (4 x 4mm) ................. 42 ....... 9 .... °C/W
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-to-ambient thermal resistance JA, and the ambient
temperature TA. The maximum allowable continuous powe
r
dissipation at any ambient temperature is calculated by
PD(MAX)=(TJ(MAX)-TA)/JA. Exceeding the maximum
allowable power dissipation will cause excessive die
temperature, and the regulator will 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
operation conditions.
4) Measured on JESD51-7, 4-layer PCB.
MP3388S—55V, 8-STRING, STEP-UP, WHITE LED DRIVER
MP3388S Rev.1.02 www.MonolithicPower.com 3
9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
V
IN
=12V, V
EN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameters Symbol Condition Min Typ Max Units
Operating Input Voltage V
IN
4.3 25 V
Supply Current (Quiescent) I
Q
V
IN
=12V, V
EN
=5V, no load. 1.8 mA
Supply Current (Shutdown) I
ST
V
EN
=0V, V
IN
=12V 2 A
LDO Output Voltage V
CC
V
EN
=5V, 6V<V
IN
<25V,
0<I
VCC
<10mA
4.5 5 5.5 V
Input UVLO Threshold V
IN_UVLO
Rising Edge 3.4 3.9 4.3 V
Input UVLO Hysteresis 200 mV
EN ON Threshold V
EN_ON
V
EN
Rising 1.5 V
EN OFF Threshold V
EN_OFF
V
EN
Falling 0.8 V
EN Pull-Down Resistor R
EN PD
500 k
EN Source Current I
EN SOURCE
V
EN
=5V 10 15 A
EN Sink Current I
EN SINK
V
EN
=0V 1 A
STEP-UP CONVERTER
SW ON-Resistance R
DS_ON
I
DS
=20mA 0.18 0.3
SW Leakage Current I
SW_LK
V
SW
=45V 1 A
Switching Frequency f
SW
V
OSC
=V
CC
or Floating 1.0 1.25 1.5 MHz
V
OSC
=0V 500 625 750 kHz
OSC High-Level Threshold V
OSC_H
f
SW
=1.25MHz 2.1 V
OSC Low-Level Threshold V
OSC_L
f
SW
=625kHz 0.8 V
Minimum ON Time
ON_MIN
PWM Mode,
when no pulse skipping happens
100 ns
Maximum Duty Cycle D
MAX
90 93 96 %
SW Current Limit I
SW_LIMIT
Duty=90% 2.0 A
COMP Transconductance G
COMP
I
COMP
=±10A 100 A/V
COMP Output Current I
COMP
60 A
PWM DIMMING
PWMI HIGH Threshold V
PWMI_H
1.5 V
PWMI LOW Threshold V
PWMI_L
0.8 V
PWMO Output Impedance R
PWMO
300 400 500 k
PWMI Leakage Current I
PWMI_LK
-1 +1 A
PWMI Source Current I
PWM SOURCE
V
PWMI
=5V 1 A
PWMI Sink Current I
PWM SINK
V
PWMI
=0V 3 6 A
DPWM Frequency f
DPWM
C
FPWM
=2.2nF 1.2 1.6 2 kHz
P1-P3P4-P6P7-P9P10-P12P13-P15

MP3388SGR-Z

Mfr. #:
Buy MP3388SGR-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers 50V, 8-String White LED Drvr
Lifecycle:
New from this manufacturer.
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