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PDF A7208 Data sheet ( Hoja de datos )
| Número de pieza | A7208 | |
| Descripción | DUAL CHANNEL 1.5MHz 800mA EACH CHANNEL SYNCHRONOUS STEP-DOWN DC-DC CONVERTER | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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AiT Semiconductor Inc.
www.ait-ic.com
A7208
DUAL CHANNEL 1.5MHz, 800mA EACH CHANNEL
SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
DESCRIPTION
The A7208 is a dual constant frequency, 1.5MHz,
slope compensated current mode PWM step-down
converter working under an input voltage range of
2.5V to 5.5V. This feature makes the A7208
suitable for single cell Li-ion battery-powered
applications. The internal synchronous rectifier is
desired to increase efficiency without an external
Schottky diode. 100% duty cycle capability extends
battery life in portable devices, while the quiescent
current is 180μA at no load, and drops to < 1μA in
shutdown. Pulse Skipping Mode operation
increases efficiency at light loads, further extending
battery life.
Low output voltage ripple and small external
inductor and capacitor sizes are achieved with
1.5MHz switching frequency.
The A7208 is available in PSOP8 package.
ORDERING INFORMAITON
Package Type
Part Number
PSOP8
Note
MP8
A7208MP8R-XXZ
A7208MP8VR-XXZ
XX: 18=1.8V,ADJ=Adjustable
Z: Pin Define
See Pin Description
V: Green Package
R : Tape & Reel
AiT provides all Pb free products
Suffix “ V “ means Green Package
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Switching Frequency
Current Mode Operation for Excellent Line and
Load Transient Response
No Schottky Diode Required
2.5V to 5.5V Input Voltage Range
Adjustable Output Voltage
100% Duty Cycle in Dropout Mode
Output Current: Up to 800mA per Channel
Low Quiescent Current: 180μA each
Over temperature Protection
Short Circuit Protection
Shutdown Quiescent Current < 1μA
Available in PSOP8 package
APPLICATIONS
Cellular and Smart Phones
Wireless Handsets and DSL Modems
Microprocessors and DSP Core Supplies
PDAs
Digital Still and Video Cameras
MP3/MP4/MP5 Players
Portable Instruments
GPS Receivers
TYPICAL APPLICATION
REV1.1
-JUN 2010 RELEASED, SEP 2011 REVISED -
A7208-ADJ (Adjustable Type)
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A7208
DUAL CHANNEL 1.5MHz, 800mA EACH CHANNEL
SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
1. Efficiency vs. Output Current
2. Output Voltage vs. Load Current
3. Reference Voltage vs. Temperature
4. Output Voltage vs. Input Voltage
5. Supply Current vs. Supply Voltage
6. Start_up from Shutdown
REV1.1
-JUN 2010 RELEASED, SEP 2011 REVISED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A7208
DUAL CHANNEL 1.5MHz, 800mA EACH CHANNEL
SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Layout Considerations
When laying out the printed circuit board, the following checklist should be used to ensure proper operation
of the A7208. Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short,
direct and wide.
2. Does the VFB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be
connected between the (+) plate of COUT and ground.
3. Does the (+) plate of CIN connect to VIN as closely as possible? This capacitor provides the AC
current to the internal power MOSFETS.
4. Keep the switching node, SW, away from the sensitive VFB node.
5. Keep the (-) plates of CIN and COUT as close as possible.
REV1.1
-JUN 2010 RELEASED, SEP 2011 REVISED -
- 11 -
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet A7208.PDF ] | |
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