Global Mixed-mode Technology
G5383A
General Description
G5383A is a 4A, synchronous DC/DC buck converter
with integrated 30mΩ N-channel high-side MOSFET
and 30mΩ 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
G5383A 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 built-in 5V LDO supports 10mA for internal
circuits. The G5383A is intended for the power supply
as low as 0.9V. The G5383A is available in
QFN3X3-24 package.
High Efficiency 4A Synchronous Buck Converter
Features
Ultra-High Efficiency
Low Quiescent Current of 30µA
Integrated 30mΩ at V5V=5V N-Channel MOSFET
for Low Side
Integrated 30mΩ at V5V=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
Adjustable Output Range from 0.9V
4.5V to 28V Adapter or Battery Input Range
Integrated Boost Switch
OVP & UVP
Over Temperature Protection (non-latch)
3.3ms Soft-Start
Power-Good Indicator
Fixed 5V, 10mA Linear Regulator
Applications
Networking Power Supply
I/O Supply
Ordering Information
ORDER
NUMBER
G5383AQU1U
Note: QU: QFN3X3-24
1: Bonding Code
U : Tape & Reel
MARKING
5383A
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
QFN3X3-24
Pin Configuration
TON
BST
V+
21
FB
V+
20
24
23
22
AGND
V5V
V+
PGOOD
EN
PGND
NC
1
2
3
4
5
6
7
19
18
17
16
15
14
13
V+
V+
V+
LX
PGND
PGND
PGND
V+
LX
11
PGND
10
G5383A QFN3X3-24
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
PGND
LX
LX
LX
12
8
9
Ver: 0.4
Nov 27, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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