GMT G5797A 500khz 2a/3a synchronous step-down dc/dc Datasheet

G5796/G5796A
G5797/G5797A
Global Mixed-mode Technology
500kHz 2A/3A Synchronous Step-down DC/DC
Features
General Description
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The G5796/G5797 is a monolithic step-down switch
mode regulator with a built in internal power MOSFET. It
achieves 2A/3A continuous output current over a wide
input supply range with excellent load and line regulation.
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2A/3A Output Current
0.1Ω Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic Capacitors
Up to 95% Efficiency
32µA Shutdown Mode
Fixed 500kHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.5V to 24V Operating Input Range
Output Adjustable from 0.92V to 21.6V
Available in SOP-8/SOP-8 (FD) Package
Build in skip mode at light loading in
G5796A/G5797A
Current mode operation provides fast transient response and eases loop stabilization.
Provide skip mode in G5796A/G5797A. When loading
too light clock skip several cycle proportional to load.
Fault condition protection includes cycle-by-cycle current limiting, output short circuit protection and thermal
shutdown. In shutdown mode the regulator draws
32µA of supply current. Programmable soft-start overwrites the internal soft-start for various requirement of
output power up ramp and minimizes the inrush supply
current at initial startup.
Applications
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DSL Modems
Distributed Power Systems
Pre-Regulator for Linear Regulators
The G5796/G5797 requires a minimum number of
readily available standard external components. It is
available in a SOP-8/SOP-8 (FD) package.
Ordering Information
ORDER
NUMBER
MARKING
LIGHT LOAD
TEMP.
RANGE
PACKAGE
(Green)
G5796P11U
G5796
PWM MODE
-40°C to +85°C
SOP-8
G5796AP11U
G5797F11U
G5796A
G5797
SKIP MODE
PWM MODE
-40°C to +85°C
-40°C to +85°C
SOP-8
SOP-8 (FD)
G5797AF11U
G5797A
SKIP MODE
-40°C to +85°C
SOP-8 (FD)
Note: P1: SOP-8
F1: SOP-8 (FD)
1: Bonding Code
U : Tape & Reel
Pin Configuration
Typical Application Circuit
G5796/G5796A
BS
IN
LX
GND
C1
10µF/35V
8
1
7
2
3
6
4
C5
0.1µF
INPUT
4.5V to 24V
5
SS
CERAMIC
x2
EN
R4
100kΩ 2
7
8
BS
EN
LX
3
G5796/G5796A
SS
FB
4
L1
4.7µH
OUTPUT
3.3V/2A
R1
26.1kΩ
1%
6
R2
10kΩ
1%
C3
3.9nF
R3
C6
OPEN
FB
5
COMP
GND
C4
0.1µF
COMP
1
IN
C2
22µF/35V
CERAMIC
6.8kΩ
SOP-8
G5797/G5797A
BS
8
1
C5
0.1µF
INPUT
4.5V to 24V
SS
C1
10µF/35V
CERAMIC
IN
LX
GND
2
Thermal
Pad
3
7
EN
7
8
6
4
x2
R4
100kΩ 2
5
COMP
C4
0.1µF
1
IN
BS
LX
EN
G5797/G5797A
SS
FB
5
COMP
GND
4
6
FB
C6
OPEN
SOP-8 (FD)
3
C3
3.9nF
R3
L1
4.7µH
R1
26.1kΩ
OUTPUT
3.3V/3A
1%
R2
10kΩ
1%
C2
22µF/35V
CERAMIC
6.8kΩ
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.6
Aug 05, 2013
1
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