High Efficiency 8A Synchronous Buck Converter

G5333
Global Mixed-mode Technology
High Efficiency 8A Synchronous Buck Converter
Features
General Description
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G5333 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 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
G5333 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 10mA for internal
circuits. The G5333 is intended for the power supply
as low as 0.9V. The G5333 is available in QFN3X3-21
package.
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Ultra-High Efficiency
Low Quiescent Current of 30µA
Integrated 15mΩ 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 ILIMIT)
Quasi-PWM with 100ns Load-Step Response
1% VOUT Accuracy Over Line and Load
Programmable Switching Frequency
0.9V to 5.5V Adjustable Output Range
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
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Networking Power Supply
I/O Supply
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5333QP1U
5333
-40°C to +85°C
QFN3X3-21
Note: QP: QFN3X3-21
1: Bonding Code
U : Tape & Reel
AGND
V5V
TON
BST
V+
V+
V+
V+
20
19
18
17
16
15
21 FB
Pin Configuration
14 V+
1
V+
AGND
2
13 V+
PGOOD 3
EN
4
PGND
5
PGND
6
9
10
11
12
PGND
PGND
PGND
8
LX
LX
7
LX
LX
G5333 QFN3X3-21
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.5
Aug 12, 2013
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