LTC2952IUF#TRPBF

LTC2952 Pushbutton PowerPath Controller with Supervisor FEATURES DESCRIPTION n The LTC®2952 is a power management device that features three main functions: pushbutton on/off control of system power, ideal diode PowerPath™ controllers and system monitoring. The LTC2952’s pushbutton input, which provides on/off control of system power, has independently adjustable ON and OFF debounce times. A simple microprocessor interface involving an interrupt signal allows for proper system housekeeping prior to power-down. n n n n n n n n n n Pushbutton On/Off Control Automatic Low Loss Switchover Between DC Sources Wide Operating Voltage Range: 2.7V to 28V Low 25μA Shutdown Current Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature Adjustable Pushbutton On/Off Timers Simple Interface Allows Graceful μP Shutdown Extendable Housekeeping Wait Time Prior to Shutdown 200ms Reset Delay and 1.6s Watchdog Timeout ±8kV HBM ESD on PB Input 20-pin TSSOP and QFN (4mm × 4mm) Packages The ideal diode PowerPath controllers provide automatic low loss switchover between two DC sources by regulating two external P-channel MOSFETs to have a small 20mV forward drop. High reliability systems may utilize the LTC2952’s monitoring features to ensure system integrity. These features include: power-fail, voltage monitoring and μP watchdog. APPLICATIONS n n n n n The LTC2952 operates over a wide operating voltage range to accommodate a large variety of input power supplies. The part’s combination of low 20mV external MOSFET regulation and very low standby current matches battery powered and power conscious application requirements. Desktop and Notebook Computers Portable Instrumentations Cell Phones, PDA and Handheld Computers Servers and Computer Peripherals 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 VIN Si6993DQ LT1767-2.5 1k SHDN 12V BATTERY 365k Si6993DQ 511k G1 VS V1 V2 LTC2952 EN CONSTANT RON 10k 1k 1k 100k PFI G2 1 VOUT CURRENT (A) ADAPTER, 3V TO 25V D2 ** 100k IDEAL DIODE CONSTANT VOLTAGE D3 VM SCHOTTKY DIODE D1 RST M1 G1STAT M2 PFO μP INT PB ONT *22nF 0 0.50 0.02 FORWARD VOLTAGE (V) KILL 2952 TA01b GND OFFT WDE *68nF *OPTIONAL **SHDN INTERNALLY PULLED UP BY THE LT1767-2.5 2952 TA01 2952fb 1 LTC2952 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltages V1, V2, VS .............................................. –0.3V to 30V Input Voltages PB .................................... –6V to MAX (V1, V2, VS) V ONT, OFFT ............................................... –0.3V to 3V M1, M2, PFI, VM, WDE, KILL ................... –0.3V to 7V Output Voltages G1, G2, EN .................... –0.3V to MAX (V1, V2, VS) V G1STAT, PFO, RST, INT ............................ –0.3V to 7V Input Currents PB .......................................................–1mA to 100μA Operating Temperature Range LTC2952C ................................................ 0°C to 70°C LTC2952I .............................................–40°C to 85°C Storage Temperature Range .................. –65°C to 150°C Lead Temperature (Soldering, 10 sec)................... 300°C PIN CONFIGURATION 19 G1 20 19 18 17 16 KILL 3 18 V1 VM 4 17 VS 15 G2 PB 7 14 EN RST 8 13 INT PFO 9 ONT 10 12 G2 RST 5 11 EN 12 GND 11 OFFT F PACKAGE 20-LEAD PLASTIC TSSOP TJMAX = 125°C, θJA = 90°C/W 13 V2 PB 4 6 7 8 9 10 INT 6 GND WDE 14 VS 21 WDE 3 OFFT 16 V2 15 V1 PFI 2 PFO 5 VM 1 ONT PFI G1 20 G1STAT 2 M2 1 M1 M1 M2 KILL G1STAT TOP VIEW TOP VIEW UF PACKAGE 20-LEAD (4mm s 4mm) PLASTIC QFN TJMAX = 125°C, θJA = 37°C/W 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 0°C to 70°C LTC2952IF#PBF LTC2952IF#TRPBF LTC2952IF 20-Lead Plastic TSSOP –40°C to 85°C LTC2952CUF#PBF LTC2952CUF#TRPBF 2952 20-Lead 4mm × 4mm Plastic QFN 0°C to 70°C LTC2952IUF#PBF LTC2952IUF#TRPBF 2952 20-Lead 4mm × 4mm Plastic QFN –40°C to 85°C 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: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 2952fb 2 LTC2952 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V1 = V2 = VS = 2.7V to 28V unless otherwise noted. (Notes 2, 3) SYMBOL PARAMETER CONDITIONS VMAX Operating Supply Voltage V1, V2 or VS l V1 = 2.7V to 28V, V2 = 0V, VS = Open or V2 = 2.7V to 28V, V1 = 0V, VS = Open. Measured Current at V1 or V2. l V1 = 2.7V to 28V, V2 = 3.5V, VS = Open. Measured Current at V1. IIN_OFF Quiescent Supply Current Both Ideal Diodes Switched Off (M1 = Open, M2 = 0V) MIN TYP 2.7 MAX UNITS 28 V 24 60 μA l 5 15 μA V1 = 2.7V to 28V, V2 = 3.5V, VS = Open. Measured Current at V2. l 23 50 μA IIN_ON Quiescent Supply Current Both Ideal Diodes Switched On (M1 = 0V, M2 = 0V) V1 = VS = 2.7V to 28V, V2 = 0V or V2 = VS = 2.7V to 28V, V1 = 0V. Measured Combined Current at V1 and VS or V2 and VS. l 65 170 μA V2PREF_TH V2 Preferential Threshold Voltage (M1 = Open, M2 = 0V) (Note 4) V1 = 28V, VS = Open. l 3.3 3.8 V ILEAK V1, V2 and VS Inter Pin Leakage to the Highest Supply V1 = 28V, V2 = VS = 0V; V1 = VS = 0V, V2 = 28V; V1 = V2 = 0V, VS = 28V ±3 μA Ideal Diode Function VFR Ideal Diode PowerPath Forward Regulation Voltage (V1 or V2) – VS, 2.7V ≤ (V1 or V2) ≤ 28V l 10 20 35 mV VRTO Ideal Diode PowerPath Fast Reverse Turn-Off Threshold Voltage (V1 or V2) – VS, 2.7V ≤ (V1 or V2) ≤ 28V ∆IG ≤ –100μA/mV l –20 –35 –64 mV IG(SRC) Gate Turn-Off Current G1 = G2 = VMAX – 1.5V l –2 –5 –10 μA IG(SNK) Gate Turn-On Current V1 = V2 = 2.7V to 28V, VS = (V1 or V2) – 40mV, G1 = G2 = VMAX –1.5V. l 2 5 10 μA IG(FASTSRC) Gate Fast Turn-Off Source Current V1 = V2 = 2.7V to 28V, VS = (V1 or V2) + 0.1V, G1 = G2 = VMAX –1.5V. l –0.5 –2.5 –10 mA IG(FASTSNK) Gate Fast Turn-On Sink Current V1 = V2 = 5V to 28V, VS = (V1 or V2) – 0.1V, G1 = G2 = VMAX – 1.5V. l 0.3 0.7 2 mA VG(ON) Gate Clamp Voltage IGX = 2μA, VX = 8V to 28V, VS = VX – 0.1V Measure VX – VGX l 6 7 8 V VG(OFF) Gate Off Voltage IGX = –2μA, VX = 2.7V to 28V, VS = VX + 0.1V Measure VMAX – VGX l 0.2 0.4 V tG(ON) Gate Turn-On Time VG(OFF) to VGS ≤ –3V, CGATE = 1nF (Note 5), V1 = V2 = 12V 0.1 2.5 10 μs tG(OFF) Gate Turn-Off Time VG(ON) to VGS ≥ –1.5V, CGATE = 1nF (Note 6), V1 = V2 = 12V 0.1 2.5 10 μs 1 4 6 V μA μA Pushbutton Pin (PB) VPB(VOC) PB Open-Circuit Voltage IPB = –1μA l IPB PB Input Current VPB(VOC) < VPB ≤ 28V 0V ≤ VPB < VPB(VOC) l l –1 –10 ±1 –25 VTH_PB PB Input Threshold Voltage PB Falling From High to Low l 0.65 0.77 0.8 V VHYS_PB PB Input Hysteresis l 10 25 150 mV 2952fb 3 LTC2952 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V1 = V2 = VS = 2.7V TO 28V unless otherwise noted. (Notes 2, 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Debounce Time Pins (ONT, OFFT) IONT,OFFT ONT/OFFT Pull-Up/Pull-Down Current When Timer Is Active VONT, VOFFT = 0V (Pull-Up), VONT, VOFFT = 1.5V (Pull-Down) l ±1.6 ±2.0 ±2.4 μA tDB,ON/OFF Internal Default On-Time/Off-Time tDB,ON: CONT = Open, Measured Time Between PB Low → EN High, tDB,OFF: Measured Time Between PB Low → INT Low l 18 26 34 ms tONT,OFFT Additional Adjustable Turn-On/TurnOff Time (Note 7) CONT = 1500pF, COFFT = 1500pF l 10 15 20 ms Accurate Comparator Input Pins (VM, PFI, M1, M2, KILL) VTH_VM VM Input Reset Threshold Both Falling and Rising l 0.492 0.500 0.508 V VTH PFI, M1, M2, KILL Input Threshold Voltage Falling l 0.492 0.500 0.508 V VHYS PFI, M1, M2, KILL Input Hysteresis l 5 15 IIN_LKG VM, PFI, M2, KILL Input Current V = 0.5V l M1 = 1V l –1.5 l 1 IM1_SRC M1 Input Pull-Up Current VM1(VOC) M1 Voltage Open-Circuit IM1_LKG M1 Input Leak Current M1 = 6V 25 mV ±0.1 μA –3 –5 μA 4 6 V l ±0.1 μA 1.5 V Watchdog/Extend Pin (WDE) VWDE(H,TH) Input High Threshold Voltage l VWDE(L,TH) Input Low Threshold Voltage l IWDE(IN,HL) High Low Input Current (Note 8) l IWDE(IN,HZ) Hi-Z Input Current VWDE = 0.7V, 1.1V l 0.3 V ±25 ±10 μA μA Open-Drain Output Pins (G1STAT, INT, RST, PFO) IOUT_LKG Leakage Current VPIN = 5V l ±1 μA VOL Voltage Output Low IPIN = 1mA l 0.4 V VEN = 28V, EN Sink Current Off l ±1 μA IEN = 3mA l V1 = 1.2V and/or V2 = 1.2V, IEN = 100μA l High Voltage Open-Drain Output Pin (EN) IEN(LKG) EN Leakage Current VEN(VOL) EN Voltage Output Low 0.4 V 0.05 0.3 V Voltage Monitor/Watchdog Timing tRST Reset Timeout Period l 140 200 260 ms tWDE Watchdog Timeout Period l 1.1 1.6 2.1 s tWDE(PW MIN) Minimum Period Between Consecutive Edges l 5 10 μs tVM(UV) VM Undervoltage Detect to RST VM Less Than VTH_VM by More Than 1% 150 μs tPFI PFI Delay to PFO PFI More or Less Than VPFI_TH by More Than 1% 150 μs 2952fb 4 LTC2952 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V1 = V2 = VS = 2.7V to 28V unless otherwise noted. (Notes 2, 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 10 50 250 μs 150 500 μs μP Handshake Timing tINT(MIN) INT Minimum Pulse Width Minimum Measured Time PB Rising to INT Rising l tKILL(PW) KILL Minimum Pulse Width Full Swing Pulse From 5V to 0V l tKILL,ON BLANK KILL On Blanking (Note 9) KILL = 0V, Measured Time Between EN Rising → EN Falling l 270 400 530 ms tKILL, OFF WAIT KILL Wait Time (Note 10) KILL = 1V, COFFT = OPEN, Measured Time Between INT Falling → EN Falling l 270 400 530 ms tEN, LOCKOUT Enable Lockout Time (Note 11) Measured Time Between EN Falling → EN Rising l 270 400 530 ms Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The greatest of V1, V2 or VS is the internal supply voltage (VMAX). Note 3: All currents into pins are positive; all voltages are referenced to GND unless otherwise noted. Note 4: V2PREF_TH is the minimum voltage level at which V2 becomes the preferential source of quiescent current when both of the ideal diodes are off. Note 5: VS is stepped from (V1 or V2) + 0.2V to (V1 or V2) – 0.2V to trigger the event. The gate voltages are initially VG(OFF). Note 6: VS is stepped from VX – 0.2V to VX + 0.2V to trigger the event. Gate voltages are initially clamped at VG(ON). Note 7: The adjustable turn-on and turn-off timer period is the adjustable debounce period following the Internal default-on and default-off timer period, respectively. Note 8: The input current to the three-state WDE pin are the pull-up and the pull-down current when the pin is either set to 3.3V or GND, respectively. In the open state, the maximum pull-up or pull-down leakage current permissible is 10μA. Note 9: The turn-on KILL blanking time is the waiting period immediately following the EN pin switching high; at the end of this period the input to the KILL needs to be high to indicate that the system has powered up properly, otherwise the EN pin is immediately switched low. Note 10: The KILL wait time during the power-down process is the wait period immediately following a valid turn-off command until the EN pin switches low. Note 11: The enable lockout time is the minimum wait time between the last falling edge and the next rising edge on the EN pin. 2952fb 5 LTC2952 TIMING DIAGRAMS Ideal Diode Function – Gate Turn-On and Turn-Off Time 12.2V 12.2V 12V VS 11.8V 12V 12.05V 12.05V 9V VGX VX = 12V 10.5V 5.3V 2952 TD01 tG(ON) tG(OFF) Pushbutton Debounce Times, KILL Wait Time and Enable Lockout Time with KILL Above Threshold PB 0.775V EN 0.5*VPULL-UP INT tDB,ON 0.5*VPULL-UP tONT t < tOFFT tDB,OFF tOFFT t > tONT tKILL, OFF WAIT tDB,OFF tDB,ON tINT(MIN) tEN, LOCKOUT 2952 TD02 KILL On Blanking with KILL Below Threshold KILL EN 0.5*VPULL-UP 0.5*VPULL-UP 2952 TD03 tKILL, ON BLANK 2952fb 6 LTC2952 TIMING DIAGRAMS PFI and PFO PFI 0.515V 0.500V PFO 0.5*VPULL-UP 0.5*VPULL-UP tPFI tPFI 2952 TD04 WDE Minimum Pulse Width WDE tWDE(PW MIN) 2952 TD05 VM, WDE and RST VM WDE DON'T CARE DON'T CARE DON'T CARE DON'T CARE RST tRST 200ms tWDE 1.6s tRST 200ms