G5175
Global Mixed-mode Technology
3 Channels, High Efficiency, Synchronous Step Down
with LDO
Features
The converters can operate in 5V systems and have
Continuous Loading: 2A (Buck 1), 1A (Buck
2 and 3)
integrated power transistors. The output voltage can
be set externally using a resistor divider to any value
between 1.0V and close to the input supply. Each
converter features enable pin that allows a delayed
start-up for sequencing purposes, soft start pin that
allows adjustable soft-start time by choosing the
soft-start capacitor. The current mode control allows a
simple RC compensation.
1MHz Switching Frequency
1.0V ± 2% Voltage Reference Over Temperature
External Enable/Sequencing and Soft Start Pins
Adjustable Soft Start
Power Good Output
Cycle by Cycle Current Limit, Thermal and
Overload protection.
Built in 300mA LDO
Thermally Enhanced 4mm × 4mm 28-pin QFN
The switching frequency of the converters can operate
1 MHz.
Applications
Set Top Boxes
Blue-ray DVD
The G5175 features a supervisor circuit that monitors
each converter output. The PGOOD pin is asserted
once sequencing is done, all PG signals are reported
and a selectable end of reset time lapses. The polarity
of the PGOOD signal is active high.
General Description
The G5175 Buck1 also features a light load pulse
skipping mode, PSM mode allows for a reduction on
the input power supplied to the system when the host
processor is in stand-by (low activity) mode.
The G5175 device features three synchronous 5.5V
input range high efficiency buck converters. The con-
verters are designed to simplify its application while
giving the designer the option to optimize their usage
according to the target application.
Ordering Information
ORDER
NUMBER
TEMP.
RANGE
PACKAGE
(Green)
MARKING
G5175RV1U
5175
-40°C to +85°C
TQFN4X4-28
Note: RV: TQFN4X4-28
1: Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
G5175
5V
VIN
GND
EP
CIN
RI CI
RPG
MODE
CI0
5V
EN
V33P
V33
CI33
3.3V
PGOOD
CO33
CO331
EN3
21
20
19
18
17
16
15
V33
PGOOD
BS1
1
2
5V
PVCC3
EN1
PVCC1
BS1
CEN1
CI1
CI11
L1
LX3
CBS1
3
4
5
SS1
COMP1
1.2V
R1
LX1
Thermal
Pad
(PGND)
MODE
LX2
PVCC1
PVCC1
CO1
CD1
CSS1
RC1
CZ1
FB1
CC1
R2
5V
EN2
PVCC2
PVCC2
EN2
LX1
LX1
6
7
CI21
L2
CI2
SS2
COMP2
1.5V
R3
LX2
FB2
CO2
CD2
CSS2
RC2
CC2
CZ2
R4
5V
EN3
PVCC3
CI31
L3
CI3
G5175 TQFN4X4-28
Note: Recommend connecting the Thermal Pad to
the round for excellent power dissipation.
SS3
COMP3
3.3V
R5
LX3
FB3
CO3
CD3
CSS3
RC3
CC3
CZ3
R6
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.6
Oct 31, 2013
1
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