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PDF A7210 Data sheet ( Hoja de datos )
| Número de pieza | A7210 | |
| Descripción | PWM/PFM STEP-DOWN DC-DC CONVERTER | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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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-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A7210
PWM/PFM STEP-DOWN
DC-DC CONVERTER
TYPICAL CHARACTERISTICS
TA = 25°C, configuration as what is listed in above demo board BOM, unless otherwise specified.
1. Efficiency Vs. Output Current
2. Standby Current Vs. VIN
3. Line Regulation at IOUT = 500mA
4. Load regulation at VIN = 6V
REV1.0
- JUN 2011 RELEASED –
-5-
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet A7210.PDF ] | |
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