LTC2952 Pushbutton PowerPath Controller with Supervisor FEATURES DESCRIPTION n Pushbutton On/Off Control The LTC 2952 is a power management device that features n Automatic Low Loss Switchover Between DC three main functions: pushbutton on/off control of system Sources power, ideal diode PowerPath controllers and system n Wide Operating Voltage Range: 2.7V to 28V monitoring. The LTC2952s pushbutton input, which pro- n Low 25A Shutdown Current vides on/off control of system power, has independently n Guaranteed Threshold Accuracy: 1.5% of adjustable ON and OFF debounce times. A simple micro- Monitored Voltage Over Temperature processor interface involving an interrupt signal allows n Adjustable Pushbutton On/Off Timers for proper system housekeeping prior to power-down. n Simple Interface Allows Graceful P Shutdown The ideal diode PowerPath controllers provide automatic n Extendable Housekeeping Wait Time Prior to low loss switchover between two DC sources by regulating Shutdown two external P-channel MOSFETs to have a small 20mV n 200ms Reset Delay and 1.6s Watchdog Timeout forward drop. n 8kV HBM ESD on PB Input n High reliability systems may utilize the LTC2952s monitor- 20-pin TSSOP and QFN (4mm 4mm) Packages ing features to ensure system integrity. These features in- clude: power-fail, voltage monitoring and P watchdog. APPLICATIONS The LTC2952 operates over a wide operating voltage range n Desktop and Notebook Computers to accommodate a large variety of input power supplies. The n Portable Instrumentations parts combination of low 20mV external MOSFET regula- n Cell Phones, PDA and Handheld Computers tion and very low standby current matches battery powered n Servers and Computer Peripherals and power conscious application requirements. n Battery Backup Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Pushbutton Controller with Automatic Switchover Between Adapter and Battery Ideal Diode vs Schottky Diode Forward Voltage Drop 2.5V ADAPTER, 3V TO 25V 1 V V IN OUT Si6993DQ CONSTANT LT1767-2.5 1k 10k R ON SHDN 365k 1k 12V BATTERY Si6993DQ 511k 1k G1 VS 100k IDEAL G2 PFI D2 DIODE ** CONSTANT V1 EN 100k D3 SCHOTTKY VOLTAGE LTC2952 V2 VM DIODE D1 RST G1STAT M1 0 PFO P M2 0.02 0.50 INT FORWARD VOLTAGE (V) PB KILL 2952 TA01b WDE ONT GND OFFT *22nF *68nF *OPTIONAL **SHDN INTERNALLY PULLED UP BY THE LT1767-2.5 2952 TA01 2952fb 1 CURRENT (A)LTC2952 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltages Input Currents V1, V2, VS .............................................. 0.3V to 30V PB .......................................................1mA to 100A Input Voltages Operating Temperature Range PB .................................... 6V to MAX (V1, V2, VS) V LTC2952C ................................................ 0C to 70C ONT, OFFT ............................................... 0.3V to 3V LTC2952I .............................................40C to 85C M1, M2, PFI, VM, WDE, KILL ................... 0.3V to 7V Storage Temperature Range .................. 65C to 150C Output Voltages Lead Temperature (Soldering, 10 sec) ...................300C G1, G2, EN .................... 0.3V to MAX (V1, V2, VS) V G1STAT, PFO, RST, INT ............................ 0.3V to 7V PIN CONFIGURATION TOP VIEW TOP VIEW M2 1 20 G1STAT M1 2 19 G1 20 19 18 17 16 KILL 3 18 V1 VM 1 15 V1 VM 4 17 VS PFI VS 2 14 PFI 5 16 V2 WDE 21 V2 3 13 WDE 6 15 G2 PB G2 4 12 PB 7 14 EN RST 5 11 EN RST 8 13 INT PFO 9 12 GND 6 7 8 9 10 ONT 10 11 OFFT F PACKAGE UF PACKAGE 20-LEAD PLASTIC TSSOP 20-LEAD (4mm 4mms ) PLASTIC QFN T = 125C, = 90C/W JMAX JA T = 125C, = 37C/W JMAX JA EXPOSED PAD (PIN 21), PCB GND CONNECTION OPTIONAL ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2952CF PBF LTC2952CF TRPBF LTC2952CF 20-Lead Plastic TSSOP 0C to 70C LTC2952IF PBF LTC2952IF TRPBF LTC2952IF 20-Lead Plastic TSSOP 40C to 85C LTC2952CUF PBF LTC2952CUF TRPBF 2952 20-Lead 4mm 4mm Plastic QFN 0C to 70C LTC2952IUF PBF LTC2952IUF TRPBF 2952 20-Lead 4mm 4mm Plastic QFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: