G5385A Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – High Efficiency 8A Synchronous Buck Converter

Global Mixed-mode Technology
G5385A
High Efficiency 8A Synchronous Buck Converter
Features
„ Ultra-High Efficiency
„ Low Quiescent Current of 60µA
„ Integrated 15mΩ at VCC=5V N-Channel
MOSFET for Low Side
„ Integrated 30mΩ at VCC=5V N-Channel
MOSFET for High Side
„ No Current-Sense Resistor (Lossless I_LIMIT)
„ Quasi-PWM with 100ns Load-Step Response
„ 1% VOUT Accuracy Over Line and Load
„ Programmable Switching Frequency
„ 0.75V to 3.6V Adjustable Output Range
„ 3V to 28V Adapter or Battery Input Range
„ Integrated Boost Switch
„ OVP & UVP
„ Over Temperature Protection (non-latch)
„ 2ms Soft-Start
„ Power-Good Indicator
Applications
„ Notebook Computers
„ I/O Supply
„ Chipset/RAM Supply as Low as 0.75V
„ Networking Power Supply
Ordering Information
ORDER
NUMBER
G5385AQN1U
Note: QN: QFN4X4-28
1: Bonding Code
U: Tape & Reel
MARKING
5385A
Pin Configuration
General Description
G5385A is a 8A, synchronous DC/DC buck converter
with integrated 30mΩ N-channel high-side MOSFET
and 15mΩ N-channel low-side MOSFET. It uses con-
stant on-time control scheme to handle wide in-
put/output voltage ratios with ease and provides 100ns
“instant-on” response to load transients while main-
taining a relatively constant switching frequency. The
G5385A achieves high efficiency at a reduced cost by
eliminating the current-sense resistor found in tradi-
tional current-mode PWMs. Single-stage buck conver-
sion allows these devices to directly step down
high-voltage batteries for the highest possible effi-
ciency. The G5385A is intended for the power supply
of Notebook Computer, or other low-voltage supplies
as low as 0.75V. The G5385A is available in
QFN4X4-28 package.
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
QFN4X4-28
PGOOD 1
V+ 2
EN 3
PGND 4
NC 5
LX 6
LX 7
LX 8
V+
LX
20 V+
19 V+
18 V+
17 V+
Ver: 0.2
Aug 22, 2013
G5385A QFN4X4-28
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: [phone]
http://www.gmt.com.tw
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