GMT G5380 High efficiency 8a synchronous buck converter for 5v system power Datasheet

G5380
Global Mixed-mode Technology
High Efficiency 8A Synchronous Buck Converter for
5V System Power
Features
General Description
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G5380 is a 8A, synchronous DC/DC buck converter
with integrated 20mΩ N-channel high-side MOSFET
and 17mΩ 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
G5380 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 built-in 5V LDO supports 80mA for internal
circuit with automatic bootstrapping to DC/DC converter output. The G5380 is intended for the 5V system power supply of Notebook Computer. The G5380
is available in QFN4X4-28 package.
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Ultra-High Efficiency
Low Quiescent Current of 40µA
Integrated 17mΩ at VCC=5V N-Channel
MOSFET for Low Side
Integrated 20mΩ 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
4.5V to 5.5V Adjustable Output Range
6V to 28V Adapter or Battery Input Range
Noiseless Pulse-skipping Mode (25kHz min)
VCLK Output
Integrated Boost Switch
OVP & UVP
Over Temperature Protection (non-latch)
3.3ms Soft-Start
Power-Good Indicator
Fixed 5V, 80mA Bootstrapped Linear Regulator
Applications
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Notebook Computers
I/O Supply
„ Networking Power Supply
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Ordering Information
OUT
ON5
TON
BST
23
22
21
ENL
28
Pin Configuration
FB
QFN4X4-28
24
-40°C to +85°C
25
5380
G5380QN1U
Note: QN: QFN4X4-28
1: Bonding Code
U : Tape & Reel
LDO5
PACKAGE
(Green)
PGOOD
TEMP.
RANGE
26
MARKING
27
AGND
1
20
V+
V+
2
19
V+
18
V+
17
V+
PGND
16
PGND 15
8
PGND
LX
LX
14
7
PGND 13
6
LX
10
LX
11
PGND
5
LX
4
PGND
VCLK
9
3
LX
VCC
V+
PGND 12
ORDER
NUMBER
G5380 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: 0.3
Oct 16, 2013
1
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