G5904 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Four Channel High Efficiency White LED Driver

Global Mixed-mode Technology Inc.
G5904
Four Channel High Efficiency White LED Driver
Features
„ Dynamic 1x/2x Charge Pump Switching
„ Up to 80mA (20mA/LED) Drive Capability
„ 90% Average Efficiency
„ 0.5% (TYP) LED Current Matching
„ Wide Current Range per LED [0.1mA ~ 20mA]
„ Single Wire EN/Brightness Control
„ 2.7V to 5.5V Supply Voltage Range
„ < 1µA Shutdown Current
„ Output Over-voltage Protection
„ Open/Short LED Protection
„ Thermal Shutdown Protection
„ TDFN2.5X2.5-10 and TQFN3X3-16 Package
Applications
„ Mobile Phones
„ White LED Backlighting
„ Camera Flash LED Lighting
General Description
The G5904 charge pump drives up to four white LEDs
with regulated constant current for uniform intensity.
By utilizing dynamic 1x/2x charge-pump modes and
ultra-low-dropout current regulators, it achieves high
efficiency over the 1-cell lithium battery input voltage
range. The 250kHz fixed frequency switching allows
for tiny external components, and the regulation
scheme is optimized to ensure low EMI and low input
ripple.
The G5904 uses a single wire EN/Brightness control
to enable, disable, and set the LED current with
16-linear steps down to 100µA. Once the desired LED
brightness is set, the G5904 maintains constant LED
current as long as EN pin is kept high. If EN pin kept
low for 90µs, the G5904 enters shutdown. The
short-circuit, over-voltage, and thermal protection are
also included. The soft start is enabled to reduce the
inrush current during power on and pump mode
transformed.
Ordering Information
ORDER
NUMBER
G5904RM1U
G5904R41U
Note: RM: TDFN2.5X2.5-10
1: Bonding Code
U: Tape & Reel
MARKING
5904
5904
R4: TQFN3X3-16
Pin Configuration
TEMP.
RANGE
-40°C~ +85°C
-40°C~ +85°C
PACKAGE
(Green)
TDFN2.5X2.5-10
TQFN3X3-16
Typical Application Circuit
C1N 1
C1P 2
GND 3
LED1 4
LED2 5
G5904
Thermal
Pad
10 VIN
9 EN
8 VOUT
7 LED4
6 LED3
EN 1
N.C. 2
N.C. 3
N.C. 4
TDFN2.5X2.5-10
Thermal
Pad
12 GND
11 C1P
10 C1N
9 N.C.
G5904 TQFN3X3-16
Battery
C_IN
1µF
High
Low
C1
1µF
C1N C1P
VOUT
VIN
LED1
LED2
LED3
EN
LED4
GND
C_OUT
1µF
Ver: 0.4
Jan 28, 2010
TEL: [phone]
http://www.gmt.com.tw
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