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AiT Semiconductor

A7210 Datasheet Preview

A7210 Datasheet

PWM/PFM STEP-DOWN DC-DC CONVERTER

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AiT Semiconductor Inc.
www.ait-ic.com
A7210
PWM/PFM STEP-DOWN
DC-DC CONVERTER
DESCRIPTION
The A7210 is a CMOS-based PWM step-down
DC-DC Controller. The device offers the following
advantages: lower supply current and wider
operating input-voltage range.
The A7210 consists of an oscillator, a PWM control
circuit, a reference voltage unit, an error amplifier, a
soft-start circuit, a protection circuit, a PWM/PFM
alternative circuit, a Chip Enable circuit, and under
voltage lockout circuit. A low ripple, high efficiency
step-down DC-DC converter can be easily
composed of this IC. Output Voltage can be
adjusted with external resistors.
The A7210 uses voltage type PWM/PFM mixed
operation mode. When the load current is small, the
operation will switch into the PFM mode from PWM
mode. Therefore the efficiency at small load is
improved, and then the chip works on PWM mode.
The A7210 embeds reset type protection circuit. If
the term of maximum duty cycle keeps on a certain
time, the protection circuit restarts the operation
with soft-start and repeat this operation until
maximum duty cycle condition is released. When
the cause of large load current is removed, the chip
returns to normal condition.
The A7210 is available in SOT-25 Package.
FEATURES
Range of Input Voltage: 3V ~ 16V
Built-in Soft-start Function and Protection
Function(Reset type protection)
<1μA Shutdown Current and 80uA Quiescent
Current
Oscillation Frequency: 500KHz
High efficiency: 95%
High Accuracy Output Voltage:±2.0%
Low Temperature Coefficient: ±100ppm/°C
Operating Temperature Range: -40°C ~ 85°C
Available in SOT-25 Package
APPLICATION
Power source for hand-held communication
equipment, cameras, video instruments such as
VCRs, camcorders
Power source for battery-powered equipment
Power source for household electrical appliance
ORDERING INFORMATION
Package Type
Part Number
SOT-25
A7210E5R
E5
A7210E5VR
Note
R: Tape & Reel
V: Green Package
AiT provides all Pb free products
Suffix “ V “ means Green Package
TYPICAL APPLICATION
REV1.0
- JUN 2011 RELEASED –
-1-




AiT Semiconductor

A7210 Datasheet Preview

A7210 Datasheet

PWM/PFM STEP-DOWN DC-DC CONVERTER

No Preview Available !

AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
A7210
PWM/PFM STEP-DOWN
DC-DC CONVERTER
Pin #
1
2
3
4
5
Symbol
CE
GND
FB
EXT
VIN
Top View
Function
Chip Enable Pin (Active with “H”)
Ground Pin
Pin for Feedback Voltage
Switching Pin
Power Supply Pin
REV1.0
- JUN 2011 RELEASED –
-2-


Part Number A7210
Description PWM/PFM STEP-DOWN DC-DC CONVERTER
Maker AiT Semiconductor
Total Page 9 Pages
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