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G5309

更新时间： 2024-01-20 18:47:40
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描述
High Efficiency 10A Synchronous Buck Converter

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中文翻译

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G5309 数据手册

  
G5309  
Global Mixed-mode Technology  
High Efficiency 10A Synchronous Buck Converter  
Features  
General Description  
„
„
Ultra-High Efficiency  
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 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  
G5309 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 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.  
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  
„
„
„
„
„
LCD Monitor/LCD TV  
Notebook Computers  
I/O Supply  
Chipset/RAM Supply as Low as 0.75V  
Networking Power Supply  
Ordering Information  
ORDER  
NUMBER  
G5309QN1U  
G5309QA1U  
TEMP.  
RANGE  
PACKAGE  
(Green)  
MARKING  
5309  
5309  
-40°C to +85°C  
-40°C to +85°C  
QFN4X4-28  
QFN5X5-32  
Note: QN: QFN4X4-28 QA: QFN5X5-32  
1: Bonding Code  
U : Tape & Reel  
Pin Configuration  
24  
23  
1
2
3
4
V+  
V+  
ILIM  
20  
1
2
3
4
5
6
7
8
ILIM  
AGND  
V5V  
PGND  
LX  
V+  
AGND  
19  
V+  
AGND  
V+  
V+  
AGND  
22 V+  
18  
17  
V5V  
V+  
V+  
21  
PGND  
V+  
5
6
20  
LX  
LX  
LX  
LX  
PGND  
19  
18  
PGND  
PGND  
LX  
LX  
LX  
LX  
7
8
LX  
17 PGND  
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
1

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