G5172
Global Mixed-mode Technology
High Efficiency, 4A Output, Synchronous Step Down
Features
General Description
The G5172 device is a full featured 6.0V, 4A synchro-
nous step down current mode converter with two inte-
grated MOSFETs.
Two 30mΩ (typical) MOSFETs for high effi-
ciency at 4A loads
200kHz to 2MHz Switching Frequency
0.8V ± 1% Voltage Reference Over Temperature
Synchronizes to External Clock
Adjustable Soft Start
UV and OV Power Good Output
Low Operating and Shutdown Quiescent Cur-
rent
The G5172 enables small designs by integrating the
MOSFETs, implementing current mode control to re-
duce external component count, reducing inductor size
by enabling up to 2MHz switching frequency, and
minimizing the IC footprint with a small 3mm x 3mm
(4mm x 4mm) thermally enhanced QFN package.
Safe Start-up into Pre-Biased Output
Cycle by Cycle Current Limit, Thermal and Fre-
quency Fold Back Protection
The G5172 provides accurate regulation for a variety
of loads with an accurate ±1% Voltage Reference
(VREF) over temperature.
Thermally Enhanced 3mm × 3mm 16-pin QFN
and 4mm × 4mm 16-pin QFN
Package QFN4x4 Loads can attain to 5A
Efficiency is maximized through the integrated 30mΩ
MOSFETs and 350µA typical supply current. Using the
enable pin, shutdown supply current is reduced to 2µA
by entering a shutdown mode.
Applications
Low-Voltage, High-Density Power Systems
Point of Load Regulation for High Performance
DSPs, FPGAs, ASICs and Microprocessors
Broadband, Networking and Optical Commu-
nication Infrastructure
Under voltage lockout is internally set at 2.6V, but can
be increased by programming the threshold with a
resistor network on the enable pin. The output voltage
startup ramp is controlled by the soft start pin. An open
drain power good signal indicates the output is within
93% to 107% of its nominal voltage.
Ordering Information
Frequency fold back and thermal shutdown protects
the device during an over-current condition.
ORDER
Marking
TEMP.
RANGE
PACKAGE
(Green)
NUMBER
G5172R41U
G5172R41D
G5172R81U
5172
5172
5172
-40°C to +85°C TQFN3X3-16
-40°C to +85°C TQFN3X3-16
-40°C to +85°C TQFN4X4-16
Note: R4: TQFN3X3-16 R8:TQFN4X4-16
1: Bonding Code
U & D: Tape & Reel
Pin Configuration
Typical Application Circuit
G5172
VIN
3.3V to 6.0V
G5172
VIN
LO
1.0µH
BS
LX
R3
48.7KΩ
R5
100KΩ
VOUT
1.8V
CBS
0.1µF
C2
0.1µF
CI
10µF
1
12
LX
VINA
CO
22*2µF
R4
32.4KΩ
CD*
EN
PG
R1
100KΩ
2
3
4
11
10
9
LX
LX
VIN
GND
GND
Thermal
Pad
FB
(0.803V)
R2
80KΩ
GND
AGND
EP
SS
SS
RT
COMP
RT
182KΩ
CSS
0.01µF
RC
20KΩ
CC
CZ*
470PF
TQFN3X3-16/TQFN4X4-16
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
＊ Option
＊ VINA must connect to VIN
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.9
Jul 18, 2012
1
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