DATA SHEET AAT4712 Power Path with Input Current Limit and Capacitor Charger General Description Features The AAT4712 is a programmed, current limited P-channel V Range: 2.5V 5.5V CC MOSFET power switch designed for high-side load-switch- Input Current Limits: ing applications for SSD memory buffer saving solutions. 150mA - 2400mA With the programmed current limit, the AAT4712 ensures 10% Current Accuracy at 2A Input Current Limit that the power ratings of the host are not exceeded and Setting balances the system load and supercap charging current Low Quiescent Current: automatically to provide enough system load current in 70A Typical (VCC Input) top-priority. The integrated discharge path control assures 12A Typical (OUT Input) that the system load can still be supported in the short Under-Voltage Lockout term when the input power has not fully charged the Integrated Discharge Path for SYS (to System Load) supercap. The current limit is programmed by an external from VCC Input or OUT Input (Connect to Supercap) resistor allowing 10% accuracy at room temperature. Maximum 100m R from OUT to SYS at 5V V DS(ON) CC Reverse Blocking Protection The AAT4712 integrates discharge path for SYS (to Power Loop Current Reduction system load) from VCC input or OUT input (connect to Over-Temperature Protection supercap). The low R from OUT to SYS prolongs the DS(ON) SYS Short Circuit Protection supercap backup time when VCC drops below a threshold Input Power Good Detect Threshold Setting (ADJ) voltage which is programmed by an external resistor Input Power Good Indicate (POK) from ADJ to ground. Supercap Charge Ready (RDY) Output The AAT4712 incorporates a POK function which can Temperature Range: -40 to 85C indicate system input power good. An ADJ pin is pro- 16-Pin TDFN34 Package vided with the addition of an external resistor for setting the input power good detect threshold. The AAT4712 Applications also incorporates a supercap charge ready (RDY) indicate function. The quiescent supply current is typically a low SSD 70A from the discharge path of VCC to SYS. The AAT4712 is available in a 16-pin TDFN34 package and is specified over a -40 to 85C temperature range. Typical Application V IO V SYS V CC VCC SYS 2.5V - 5.5V RDY RDY ADJ AAT4712 C IN POK POK 10F ISET R OUT ADJ GND Super R C SET SYS Capacitor 10F Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 201912B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. August 30, 2012 DATA SHEET AAT4712 Power Path with Input Current Limit and Capacitor Charger Pin Descriptions Pin Symbol Function 1 RDY Supercap charge ready output, initiated when the capacitor is 98% charged. Open drain, active high. Input current-limit set input. A resistor from ISET to ground is necessary and sets the maximum cur- 2 ISET rent limit for the switch. The current limit can be programmed from 150mA to 2000mA. 3 N/C No connect. 4, 5, 6, 7, 8 SYS System power output supplied from the VCC input or OUT input. 9, 10, 11 OUT Connect to super capacitor from OUT to GND. 12, 13 VCC Input pins to the P-channel MOSFET source. Connect a 10F capacitor from VCC to GND. 14 ADJ Input power good detect threshold. An internal 50k resistor is integrated between ADJ and VCC. 15 GND Device ground connection. 16 POK Input power good indicator. Push pull, active high. Pin Configuration TDFN34-16 (Top View) 1 16 POK RDY 2 15 ISET GND 3 14 N/C ADJ 4 13 SYS VCC 5 12 VCC SYS 6 11 OUT SYS 7 10 SYS OUT 8 9 SYS OUT Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 201912B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. August 30, 2012