High Efficiency 10A Synchronous Buck Converter

G5309
Global Mixed-mode Technology
High Efficiency 10A Synchronous Buck Converter
Features
General Description
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G5309 is a 10A, synchronous DC/DC buck converter
with integrated 20mΩ N-channel high-side MOSFET
and 8.5mΩ 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
G5309 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 20mA for internal
circuits. The G5309 is intended for the main power
supply of LCD TV, Notebook Computer, or other
low-voltage supplies as low as 0.75V. The G5309 is
available in QFN4X4-28 and QFN5X5-32 package.
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Ultra-High Efficiency
Integrated 8.5mΩ 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
Adjustable Output Range from 0.75V
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, 20mA Linear Regulator
Applications
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LCD Monitor/LCD TV
Notebook Computers
„ I/O Supply
„ Chipset/RAM Supply as Low as 0.75V
„ Networking Power Supply
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Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5309QN1U
G5309QA1U
5309
5309
-40°C to +85°C
-40°C to +85°C
QFN4X4-28
QFN5X5-32
Note: QN: QFN4X4-28
1: Bonding Code
U : Tape & Reel
QA: QFN5X5-32
7
LX
8
16
PGND
LX
17 PGND
15
18
PGND
7
8
14
LX
PGND
PGND 16
PGND 15
PGND 14
LX
13
21
LX
V+
12
BST
NC
22
6
AGND
PGND
EN
23
LX
LX
PGND 13
25 NC
PGND
PGND
5
PGND 12
26 BST
PGND
V+
6
LX 10
28 TON
PGND
19
17
LX
PGND 11
27 EN
V+
20
3
LX
9
29 OUT
21
2
V5V
5
LX
30 VCC
V+
4
AGND
V+
LX
31 FB
TON
24
32 PGOOD
V+
22
V+
18
PGND
4
23
19
11
PGND
V+
AGND
1
PGND
3
ILIM
9
2
V5V
V+
V+
10
AGND
24
20
LX
VCC
OUT
25
FB
27
26
PGOOD
1
LX
ILIM
28
Pin Configuration
G5309 QFN5X5-32
G5309 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: 0.7
Apr 01, 2013
1