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AAT4621 Dataheets PDF



Part Number AAT4621
Manufacturers Skyworks
Logo Skyworks
Description PC Card Current Limit Interface and Capacitor Charger
Datasheet AAT4621 DatasheetAAT4621 Datasheet (PDF)

DATA SHEET AAT4621 PC Card Current Limit Interface and Capacitor Charger General Description The AAT4621 SmartSwitch family is a current limited P-channel MOSFET power switch designed for high-side load-switching applications in PC Card GSM/GPRS/3G modem cards. Used in conjunction with a super capacitor, the AAT4621 will ensure that the power ratings of the PCMCIA host are not exceeded at any time. Featuring two independent, programmable current limits and a power loop, the AAT4621 can ensure t.

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DATA SHEET AAT4621 PC Card Current Limit Interface and Capacitor Charger General Description The AAT4621 SmartSwitch family is a current limited P-channel MOSFET power switch designed for high-side load-switching applications in PC Card GSM/GPRS/3G modem cards. Used in conjunction with a super capacitor, the AAT4621 will ensure that the power ratings of the PCMCIA host are not exceeded at any time. Featuring two independent, programmable current limits and a power loop, the AAT4621 can ensure that the super capacitor can be charged without exceeding PCMCIA specifications. The current limit is set by two external resistors allowing a ±10% current limit accuracy over the normal operating temperature range. The switch can be controlled from either of the two enable inputs and in the off condition will block currents in both directions. The AAT4621 also incorporates a System READY function which can advise the system that the super capacitor is fully charged and ready for use. Adjustable hysteresis is provided with the addition of an external resistor. The quiescent supply current is typically a low 40μA. In shutdown mode, the supply current decreases to less than 1μA. The AAT4621 has a current limit range from 75mA to 1200mA; the AAT4621-1 has a current limit range from 150mA to 2400mA. The AAT4621 is available in a thermally enhanced, Pb-free 14-pin TDFN33 package and is specified over the -40°C to 85°C temperature range. Features • Operating Voltage Range: 3.0V to 5.5V • Dual Independent Current Limits ▪ AAT4621: 75mA to 1200mA ▪ AAT4621-1: 150mA to 2400mA ▪ ±10% Current Accuracy • Reverse Current Blocking Protection • Power Loop • Low Quiescent Current ▪ 40μA Typical ▪ 1.0μA Max with Switch Off • 65m Typical RDS(ON) at 3V • System READY Output with Externally Programmable Hysteresis • Only 1.4V Needed for Enable Control Pin • Under-Voltage Lockout • Over-Temperature Protection • Temperature Range: -40 to 85°C • 14-Pin TDFN33 Package Applications • Capacitor Charger • CF Card Port Power Protection • Express Card GSM/GPRS/3G Modems • PC Card GSM/GPRS Class 10/12 Modems • WiMAX Cards Typical Application VCC ENIL ENIU VCC EN IL UnderVoltage Lockout Reverse Blocking Over-Temp Protection Power Loop EN IU 1.2V Reference GND Current Limit Control RHYS OUT RDY 100k To Load To μC ISETL ISETU RSETU RSETL SuperCap Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201944A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012 1 DATA SHEET AAT4621 PC Card Current Limit Interface and Capacitor Charger Pin Descriptions Pin # 1 2 3 4 5, 6, 7 8, 9, 10, 11 12 13 14 EP Symbol RDY RHYS ISETU ISETL OUT VCC GND EN IL EN IU EP Function System ready pin. Open drain, active low, initiated when the capacitor is 98% charged. System READY hysteresis. Connect a resistor to ground to set the System Ready comparator hysteresis. Upper current limit set input. A resistor from ISETL to ground sets the maximum upper current limit for the switch. The AAT4621 has a current limit range from 75mA to 1200mA; the AAT4621-1 has a current limit range from 150mA to 2400mA. Connect to ground to disable current limit. Lower current-limit set input. A resistor from ISETU to ground sets the maximum lower current limit for the switch. The AAT4621 has a current limit range from 75mA to 1200mA; the AAT4621-1 has a current limit range from 150mA to 2400mA. Connect to ground to disable current limit. P-channel MOSFET drain connection. Connect to super capacitor from OUT to GND. Input pins to the P-channel MOSFET source. Connect 1μF capacitor from VCC to GND. Device ground connection. Enable input. Active low enable with internal pull up. Also switches in the lower current limit initiating the super capacitor to start charging. Enable input. Active low enable with internal pull up. Also switches in the higher current limit to allow the System to start functioning. Can be directly connected to System Ready for automatic enabling. When both EN IL B and EN IU B are enabled, ISETU will be selected. The exposed thermal pad (EP) must be connected to the board ground plane and Pin 12. The ground plane should include a large exposed copper pad under the package for thermal dissipation (see package outline). Pin Configuration TDFN33-14 (Top View) RDY 1 RHYS 2 ISETU 3 ISETL 4 OUT 5 OUT 6 OUT 7 14 ENIU 13 ENIL 12 GND EP 11 VCC 10 VCC 9 VCC 8 VCC Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 201944A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012 DATA SHEET AAT4621 PC Card Current Limit Interface and Capacitor Charger Absolute Maximum Ratings1 Symbol VCC VEN VSET, VOUT IMAX TJ TLEAD TSTG Description VCC to GND ENIL, ENIU to GND ISETL, ISETU, OUT to GND Maximum Co.


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