G2120 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 3 Channels, High Efficiency, Synchronous Step Down with LDO

Global Mixed-mode Technology
G2120
3 Channels, High Efficiency, Synchronous Step Down
with LDO
Features
„ Continuous Loading: 3A (Buck 1), 1A (Buck
2 and 3)
„ 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 500mA LDO
„ Thermally Enhanced 4mm × 4mm 28-pin QFN
Applications
„ Set Top Boxes
„ Blue-ray DVD
General Description
The G2120 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
G2120RV1U
Note: RV: TQFN4X4-28
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
2120
V33 1
PGOOD 2
BS1 3
PVCC1 4
PVCC1 5
LX1 6
LX1 7
Thermal
Pad
(PGND)
21 EN3
20 PVCC3
19 LX3
18 MODE
17 LX2
16 PVCC2
15 EN2
G2120 TQFN4X4-28
Note: Recommend connecting the Thermal Pad to
the round for excellent power dissipation.
The converters can operate in 5V systems and have
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.
The switching frequency of the converters can operate
1 MHz.
The G2120 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.
The G2120 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.
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
TQFN4X4-28
Typical Application Circuit
5V
CIN
RI
CI
CI0
RPG
G2120
VIN
GND
MODE
EP
EN
PGOOD
V33P
V33
3.3V
CO33 CO331
5V
CI33
CEN1
EN1
SS1
COMP1
CSS1
CZ1
RC1
CC1
EN2
CSS2
SS2
COMP2
CZ2
RC2
CC2
EN3
CSS3
SS3
COMP3
CZ3
RC3
CC3
PVCC1
BS1
CBS1
LX1
FB1
PVCC2
LX2
FB2
PVCC3
LX3
FB3
5V
CI11
L1
CO1
CI1
1.2V
R1
CD1
R2
5V
CI21
L2
CO2
CI2
1.5V
R3
CD2
R4
5V
CI31
L3
CO3
CI3
3.3V
R5
CD3
R6
Ver: 0.4
Oct 31, 2013
TEL: [phone]
http://www.gmt.com.tw
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