Global Mixed-mode Technology
G5380
General Description
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 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
G5380 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 80mA for internal
circuit with automatic bootstrapping to DC/DC con-
verter output. The G5380 is intended for the 5V sys-
tem power supply of Notebook Computer. The G5380
is available in QFN4X4-28 package.
High Efficiency 8A Synchronous Buck Converter for
5V System Power
Features
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 I
LIMIT
)
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
Notebook Computers
I/O Supply
Networking Power Supply
Ordering Information
ORDER
NUMBER
G5380QN1U
Note: QN: QFN4X4-28
1: Bonding Code
U : Tape & Reel
MARKING
5380
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
QFN4X4-28
PGOOD
LDO5
Pin Configuration
ENL
28
OUT
ON5
TON
22
FB
27
26
24
25
23
21
BST
AGND
V+
VCC
VCLK
PGND
LX
LX
LX
1
2
3
4
5
6
7
8
10
9
11
20
19
V+
V+
V+
V+
V+
18
17
LX
PGND
12
PGND
13
PGND
15
G5380 QFN4X4-28
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
PGND
PGND
16
PGND
14
LX
LX
Ver: 0.3
Oct 16, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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