GMT G5385A High efficiency 8a synchronous buck converter Datasheet

G5385A
Global Mixed-mode Technology
High Efficiency 8A Synchronous Buck Converter
Features
General Description
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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 constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns
“instant-on” response to load transients while maintaining a relatively constant switching frequency. The
G5385A achieves high efficiency at a reduced cost by
eliminating the current-sense resistor found in traditional current-mode PWMs. Single-stage buck conversion allows these devices to directly step down
high-voltage batteries for the highest possible efficiency. 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.
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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 ILIMIT)
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
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Notebook Computers
I/O Supply
„ Chipset/RAM Supply as Low as 0.75V
„ Networking Power Supply
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Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5385AQN1U
5385A
-40°C to +85°C
QFN4X4-28
Note: QN: QFN4X4-28
1: Bonding Code
U: Tape & Reel
6
LX
7
LX
8
V+
19
V+
18
V+
17
V+
VCC
AGND
FB
TON
BST
NC
NC
LX
27
26
25
24
23
22
21
LX
LX
PGND 16
LX
PGND 15
5
PGND 14
NC
PGND 13
4
PGND 12
PGND
V+
PGND 11
3
9
V+
EN
20
10
1
2
LX
PGOOD
28
Pin Configuration
G5385A QFN4X4-28
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.2
Aug 22, 2013
1
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