G5338 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – High-Speed Step-Down Controller

Global Mixed-mode Technology
G5338
High-Speed Step-Down Controller
Features
„ Ultra-High Efficiency
„ 4700ppm/°C R_DS(ON) Current Sensing ( without
Current-Sense Resistor )
„ Quasi-PWM with 100ns Load-Step Response
„ Built in 1% 0.5V Reference Voltage
„ 0.5V to 3.3V Adjustable Output Range
„ 4.5V to 28V Battery Input Range
„ Integrated Boost Diode
„ OVP & UVP
„ 1.5ms Voltage Servo Soft-Start
„ Drives Large Synchronous-Rectifier FETs
„ Power-Good Indicator
„ Thermal Shutdown (Non-latch)
Applications
„ Notebook Computers
„ CPU Core Supply
„ I/O Supply
„ Chipset/RAM Supply as Low as 0.5V
Ordering Information
ORDER
NUMBER
G5338K71U
Note: K7: TQFN2X2-12
1: Bonding Code
U : Tape & Reel
Pin Configuration
MARKING
5338
General Description
G5338 uses constant on-time control scheme to han-
dle wide input/output voltage ratios with ease and pro-
vides 100ns “instant-on” response to load transients
while maintaining a relatively constant switching fre-
quency. The G5338 achieves high efficiency at a re-
duced cost by eliminating the current-sense resistor
found in traditional current-mode PWMs. Efficiency is
further enhanced by an ability to drive very large syn-
chronous rectifier MOSFETs. Single-stage buck con-
version allows these devices to directly step down
high-voltage batteries for the highest possible effi-
ciency. The noiseless pulse-skipping mode setting
maintains the switching frequency above 25kHz to
eliminates the audio noise. The G5338 is intended for
CPU core, chipset, DRAM, or other low-voltage sup-
plies as low as 0.5V. The G5338 is available in
TQFN2X2-12 package.
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
TQFN2X2-12
Ver: 0.4
May 03, 2012
DL 1
LX 2
DH 3
13 GND
Thermal
Pad
9 PGOOD
8 EN
7 MODE
G5338 TQFN2X2-12
1
TEL: [phone]
http://www.gmt.com.tw