Global Mixed-mode Technology
G5798/G5798A
G5799/G5799A
General Description
The G5798/G5799 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.
Fault condition protection includes cycle-by-cycle current
limiting, output short circuit protection and thermal shut-
down. In shutdown mode the regulator draws 32µA of
supply current. Internal soft-start for output power up
ramp and minimizes the inrush supply current at initial
startup.
PG in G579X is open-drain pin detect from FB. When
FB>0.92XVref, PG is high impedance and FB<0.85XVref, PG
is low impedance.
G579XA add typical 220mS deglitch timeout period when
FB>0.92XVref to make sure PG signal.
The G5798/G5799 requires a minimum number of readily
available standard external components. It is available in
a SOP-8 (FD) package.
500kHz 2A/3A Synchronous Step-down DC/DC
Features
2A/3A Output Current
Internal 100mΩ RDS-ON High-Side and
100mΩ RDS-ON Low-Side Power Switches
Available two kinds of delay in PG
PG pin is detect FB until threshold then
immediately react in G579X
PG pin is detect FB until threshold then
delay 220mS react in G579XA
Stable with Low ESR Output Ceramic Capaci-
tors
32µA Shutdown Mode
Fixed 500kHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.5V to 24V Operating Input Range
Vref =0.8V +-2%
Internal soft start
Available in SOP-8/SOP-8 (FD) Package
Applications
DSL Modems
Distributed Power Systems
Pre-Regulator for Linear Regulators
Ordering Information
ORDER
NUMBER
MARKING
PG DELAY TIME
No delay
delay 220mS
No delay
delay 220mS
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)
G5798P11U
G5798
G5798AP11U
G5798A
G5799F11U
G5799
G5799AF11U
G5799A
Note: P1: SOP-8
F1: SOP-8 (FD)
1: Bonding Code
U : Tape & Reel
Pin Configuration
G5798/G5798A
BST
IN
SW
1
8
VCC
PG
BST
1
G5799/G5799A
8
VCC
PG
2
3
7
IN
SW
2
3
Thermal
Pad
7
6
EN
6
EN
GND
4
5
FB
GND
4
5
FB
SOP-8
SOP-8 (FD)
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
Ver:0.92
Aug 05, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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