Global Mixed-mode Technology
G5385A
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.
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
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
QFN4X4-28
AGND
Pin Configuration
VCC
28
TON
BST
NC
FB
NC
22
27
26
25
24
PGOOD
V+
EN
PGND
NC
LX
LX
LX
23
21
LX
1
2
3
4
5
6
7
8
10
9
20
19
V+
V+
V+
V+
V+
18
17
LX
PGND
11
PGND
12
PGND
13
PGND
15
G5385A QFN4X4-28
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
PGND
16
PGND
14
LX
LX
Ver: 0.2
Aug 22, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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