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High Performance Single Synchronous Buck Controller with Reference Input GS7210A
Features
Dual MOSFET Drivers for Synchronous
General Description
The GS7210A is small size chip with a relative
Rectified Bridge
Adjustable Relative Constant on-time for fast
dynamic response
Programmable VOUT range
VIN range = 3V~28V
Support Internal Reference Voltage and
External Reference Voltage
Wide Output Load Range: 0 to 20A+
1% reference accuracy over load and line
Low voltage DC current sense using low-side
RDS (ON) Sensing or sense resistor
Resistor programmable frequency
Built-in Bootstrap Diode
Cycle-by-cycle current limit
4-Step Current Limit During Soft-start
Over-voltage/under-voltage fault protection
Low quiescent power dissipation
constant on-time synchronous buck switching
controller suitable for applications in notebook
computers and other battery operated devices.
The GS7210A 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 GS7210A
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 GS7210A
will take the same method to regulate the output
voltage when input voltage changes. When
transient response regulated, the controller will
maintain a new steady-state operation. Both the
Power good indicator
Integrated gate drivers with fast transmission
scheme
Over temperature protection(Non-Latch)
TQFN16-3x3 package
Green Product (RoHS, Lead-Free,
Halogen-Free Compliant)
Applications
Notebook computers
CPU core/IO Supplies
Chip/RAM Supplies
transient response state and the new state, the
GS7210A always has the same on-time.
The GS7210A supports internal 0.6V reference
voltage and external reference from 0.4V to 3.0V
for internal error amplifier. When the chip works
external reference mode, it can deliver output
voltage as low as 0.4V.
An external setting resistor and output voltage
can set the on-time, duty-cycle and frequency for
the controller. The integrated gate drivers feature
adaptive shoot-through protection, fast signal
transmission. Additional features include current
limit, soft-start, over-voltage and under-voltage
protection and a Power Good flag. The GS7210A
is available in package TQFN16-3x3.
Green Solution Technology Co.,LTD.
Rev.:1.0 1 Apr-14
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