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AAT4651

Advanced Analogic Technologies
Part Number AAT4651
Manufacturer Advanced Analogic Technologies
Description 5V/3V PC Card Power Switch
Published Apr 25, 2010
Detailed Description 5V/3V PC Card Power Switch General Description The AAT4651 SmartSwitch is a single channel PC card (PCMCIA) power switch...
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AAT4651
AAT4651

Overview
5V/3V PC Card Power Switch General Description The AAT4651 SmartSwitch is a single channel PC card (PCMCIA) power switch.
It is used to select between two different voltage inputs, each between 2.
7V and 5.
5V.
An internal switch powers the circuitry from whichever input voltage is higher.
The device's output, VCC, is slew rate controlled and current limited, in compliance with PC card specifications.
The current limit response time to a short circuit is typically 1µs.
The internal P-channel MOSFET switches are configured to break before make; that is, both switches cannot be closed at the same time.
Controlled by a 2-bit parallel interface, the three states for VCC are VCC5, VCC3, or ground.
When in the ground state, VCC is pulled to ground by an 200Ω resistor.
An open drain FAULT output is asserted during over-current conditions.
During power-up slewing, FAULT also signals that VCC is out of tolerance.
An internal over-temperature sensor forces VCC to a high impedance state when an over-temperature condition exists.
Quiescent current is typically a low 15µA, as long as ICC is less than approximately 500mA.
Above this load current, the quiescent current increases to 200µA.
The AAT4651 is available in a Pb-free, 8-pin SOP or TSSOP package and is specified over the -40°C to +85°C temperature range.
www.
DataSheet4U.
com AAT4651 Features • • • • • • • • • SmartSwitch™ 2.
7V to 5.
5V Input Voltage Range 80mΩ (5V) Typical RDS(ON) Low Quiescent Current: 15µA (Typ) Reverse-Blocking Switches Short-Circuit Protection Over-Temperature Protection FAULT Flag Output Temperature Range: -40°C to +85°C 8-Pin SOP or TSSOP Package Applications • • • Notebook Computer PDA, Subnotebook Power Supply Multiplexer Circuit Typical Application VCC5 VCC3 VCCD1 VCCD0 FAULT CIN5 1μF CIN3 1μF 8 5 2 3 4 1 VCC5 VCC3 VCCD1 VCCD0 FAULT GND AAT4651 VCC 6,7 VCC COUT 0.
1μF GND GND 4651.
2006.
05.
1.
2 1 5V/3V PC Card Power Switch Pin Descriptions Pin # 1 2 3 4 5 6, 7 8 www.
DataSheet4U.
com ...


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