Document
Global Mixed-mode Technology
G5796/G5796A G5797/G5797A
500kHz 2A/3A Synchronous Step-down DC/DC
Features
2A/3A Output Current 0.1Ω Internal Power MOSFET Switch Stable with Low ESR Output Ceramic Capaci-
tors 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
Applications
DSL Modems Distributed Power Systems Pre-Regulator for Linear Regulators
General Description
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.
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.
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 G5796P11U
MARKING G5796
G5796AP11U G5797F11U G5797AF11U
G5796A G5797 G5797A
Note: P1: SOP-8 F1: SOP-8 (FD) 1: Bonding Code U : Tape & Reel
Pin Configuration
G5796/G5796A
BS 1
8 SS
IN 2
7 EN
LX 3
6 COMP
GND 4
SOP-8
5 FB
G5797/G5797A
BS 1
8 SS
IN 2 LX 3
Thermal Pad
7 EN 6 COMP
GND 4
5 FB
SOP-8 (FD)
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
Ver: 0.6 Aug 05, 2013
LIGHT LOAD
PWM MODE SKIP MODE PWM MODE SKIP MODE
TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C
PACKAGE (Green) SOP-8 SOP-8
SOP-8 (FD) SOP-8 (FD)
Typical Application Circuit
INPUT 4.5V to 24V
C1 10µF/35V CERAMIC
x2
C4 0.1µF
C5 0.1µF
R4 100kΩ 2
7 IN EN
1
BS LX
3
G5796/G5796A
8 SS
FB 5
GND
COMP
46
C6 OPEN
C3 3.9nF
R3 6.8kΩ
L1 4.7µH
R1 26.1kΩ
1%
R2 10kΩ 1%
OUTPUT 3.3V/2A
C2 22µF/35V CERAMIC
INPUT 4.5V to 24V
C1 10µF/35V CERAMIC
x2
C4 0.1µF
C5 0.1µF
R4 100kΩ 2
7
IN EN
1
BS LX
3
G5797/G5797A
8 SS
FB 5
GND
COMP
46
C6 OPEN
C3 3.9nF
R3 6.8kΩ
L1 4.7µH
R1 26.1kΩ
1%
R2 10kΩ 1%
OUTPUT 3.3V/3A
C2 22µF/35V CERAMIC
TEL: 886-3-5788833 http://www.gmt.com.tw
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