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High Performance Single Synchronous Buck Converter GS9238
Features
Wide Output Current Range：8A
General Description
The GS9238 is small size chip with a relative
Wide Input Voltage Range：3V~28V
Adjustable 0.8V~20V Output Range
±1% Output Voltage Accuracy over Line and
Load
Constant-on-time control scheme for fast
transient and high Efficiency
Programmable Operation Frequency from
100kHz to 600kHz
Integrated 20 mΩ at LDO=5V N-Channel
MOSFET For High Side
Integrated 9.5 mΩ at LDO=5V N-Channel
MOSFET For Low Side
Selectable Forced PWM or automatic
PFM/PWM mode
Power Good Indicator
Under-Voltage Protection
Over-Voltage Protection
constant on-time synchronous buck switching
converter suitable for applications in notebook
computers and other battery operated portable
devices. Features include wide input voltage
range, high efficiency and fast dynamic response
The GS9238 has a unique power save mode,
which can save battery power supply by
decreasing frequency when load current falls
down below preset critical current point.
The fast dynamic transient response means that
buck converter applications based on GS9238
will provide about 100ns-order response to load
when output voltage falls down or rises up. The
frequency will increase or decrease to meet the
change in output load. Moreover, the GS9238 will
take the same method to regulate the output
voltage when input voltage changes. When
FB Short Protection
Internal 5V Pre-regulator
External Adjustable Soft-Start and Soft-Stop
Over Temperature Protection
Over Current Protection
TQFN23-4x4 package
Green Product (RoHS, Lead-Free,
Halogen-Free Compliant)
Applications
Notebook computers
CPU core/IO Supplies
Chip/RAM Supplies
transient response regulated, the converter will
maintain a new steady-state operation. Both the
transient response state and the new state, the
GS9238 always has the same on-time width.
The GS9238 is suitable for the solutions which
the output voltage is between 0.8V and 20V. An
external setting resistor and output voltage can
set the on-time width and frequency for the
converter. Additional features include current limit,
soft-start, over-voltage and under-voltage
protection, a Power Good flag and soft discharge
upon shutdown. The GS9238 is available in
package TQFN23-4x4.
Green Solution Technology Co., LTD.
Rev.:1P7 1 Dec-14
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