G5309 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – High Efficiency 10A Synchronous Buck Converter

Global Mixed-mode Technology
G5309
High Efficiency 10A Synchronous Buck Converter
Features
„ 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 I_LIMIT)
„ 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
General Description
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.
Ordering Information
ORDER
NUMBER
G5309QN1U
G5309QA1U
Note: QN: QFN4X4-28
1: Bonding Code
U : Tape & Reel
MARKING
QA: QFN5X5-32
5309
5309
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Green)
QFN4X4-28
QFN5X5-32
Pin Configuration
ILIM 1
AGND 2
V5V 3
PGND 4
LX 5
LX 6
LX 7
LX 8
AGND
V+
LX
20 _V+
19 V+
18 V+
17 V+
ILIM 1
AGND 2
V5V ³
PGND 4
LX 5
LX 6
LX 7
LX ⁸
AGND
V+
LX
24 V+
23 V+
22 V+
21 V+
20 PGND
19 PGND
18 PGND
17 PGND
Ver: 0.7
Apr 01, 2013
G5309 QFN4X4-28
G5309 QFN5X5-32
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: [phone]
http://www.gmt.com.tw
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