G5380 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – High Efficiency 8A Synchronous Buck Converter for 5V System Power

Global Mixed-mode Technology
G5380
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
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.
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
Pin Configuration
AGND 1
V+ 2
VCC 3
VCLK 4
PGND 5
LX 6
LX 7
LX 8
V+
LX
20 V+
19 V+
18 V+
17 V+
Ver: 0.3
Oct 16, 2013
G5380 QFN4X4-28
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: [phone]
http://www.gmt.com.tw
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