LTC2952IUFTRPBF

LTC2952 Pushbutton PowerPathTM Controller with Supervisor FEATURES n n n n n n n n n n n DESCRIPTION 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. 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. 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. 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. 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 APPLICATIONS n n n n n Desktop and Notebook Computers Portable Instrumentations Cell Phones, PDA and Handheld Computers Servers and Computer Peripherals Battery Backup Systems TYPICAL APPLICATION Pushbutton Controller with Automatic Switchover Between Adapter and Battery ADAPTER, 3V TO 25V Si6993DQ 2.5V VIN VOUT 1k 365k 511k G1 G2 V1 V2 LTC2952 VS PFI EN VM D1 RST M1 M2 PB ONT *22nF G1STAT PFO INT KILL GND OFFT WDE *68nF *OPTIONAL 2952 TA01 Ideal Diode vs Schottky Diode Forward Voltage Drop 1 CONSTANT RON CURRENT (A) LT1767-2.5 SHDN Si6993DQ 100k 1k 1k 10k 12V BATTERY D2 100k D3 IDEAL DIODE CONSTANT VOLTAGE SCHOTTKY DIODE μP 0 0.02 FORWARD VOLTAGE (V) 0.50 2952 TA01b 2952fa 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 TOP VIEW G1STAT TOP VIEW KILL M1 M2 M1 KILL VM PFI WDE PB RST 1 2 3 4 5 6 7 8 M2 20 G1STAT 19 G1 18 V1 17 VS 16 V2 15 G2 14 EN 13 INT 12 GND 11 OFFT 6 PFO 7 ONT 8 OFFT 9 10 GND INT VM 1 PFI 2 WDE 3 PB 4 RST 5 21 15 V1 14 VS 13 V2 12 G2 11 EN G1 20 19 18 17 16 PFO 9 ONT 10 F PACKAGE 20-LEAD PLASTIC TSSOP TJMAX = 125°C, θJA = 90°C/W UF PACKAGE 20-LEAD (4mm 4mm) PLASTIC QFN TJMAX = 125°C, θJA = 37°C/W EXPOSED PAD (PIN 21), PCB GND CONNECTION OPTIONAL ORDER INFORMATION LEAD FREE FINISH LTC2952CF#PBF LTC2952IF#PBF LTC2952CUF#PBF LTC2952IUF#PBF TAPE AND REEL LTC2952CF#TRPBF LTC2952IF#TRPBF LTC2952CUF#TRPBF LTC2952IUF#TRPBF PART MARKING LTC2952CF LTC2952IF 2952 2952 PACKAGE DESCRIPTION 20-Lead Plastic TSSOP 20-Lead Plastic TSSOP 20-Lead 4mm × 4mm Plastic QFN 20-Lead 4mm × 4mm Plastic QFN TEMPERATURE RANGE 0°C to 70°C –40°C to 85°C 0°C to 70°C –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/ 2952fa 2 LTC2952 ELECTRICAL CHARACTERISTICS SYMBOL VMAX IIN_OFF PARAMETER Operating Supply Voltage Quiescent Supply Current Both Ideal Diodes Switched Off (M1 = Open, M2 = 0V) 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) CONDITIONS V1, V2 or VS 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. V1 = 2.7V to 28V, V2 = 3.5V, VS = Open. Measured Current at V1. V1 = 2.7V to 28V, V2 = 3.5V, VS = Open. Measured Current at V2. l l MIN 2.7 TYP 24 MAX 28 60 UNITS V μA l l l 5 23 65 15 50 170 μA μA μA IIN_ON Quiescent Supply Current Both Ideal Diodes Switched On (M1 = 0V, M2 = 0V) V2 Preferential Threshold Voltage (M1 = Open, M2 = 0V) (Note 4) V1, V2 and VS Inter Pin Leakage to the Highest Supply Ideal Diode PowerPath Forward Regulation Voltage Ideal Diode PowerPath Fast Reverse Turn-Off Threshold Voltage Gate Turn-Off Current Gate Turn-On Current 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. V1 = 28V, VS = Open. V1 = 28V, V2 = VS = 0V; V1 = VS = 0V, V2 = 28V; V1 = V2 = 0V, VS = 28V (V1 or V2) – VS, 2.7V ≤ (V1 or V2) ≤ 28V (V1 or V2) – VS, 2.7V ≤ (V1 or V2) ≤ 28V ΔIG ≤ –100μA/mV G1 = G2 = VMAX – 1.5V V1 = V2 = 2.7V to 28V, VS = (V1 or V2) – 40mV, G1 = G2 = VMAX –1.5V. V1 = V2 = 2.7V to 28V, VS = (V1 or V2) + 0.1V, G1 = G2 = VMAX –1.5V. V1 = V2 = 5V to 28V, VS = (V1 or V2) – 0.1V, G1 = G2 = VMAX – 1.5V. IGX = 2μA, VX = 8V to 28V, VS = VX – 0.1V Measure VX – VGX IGX = –2μA, VX = 2.7V to 28V, VS = VX + 0.1V Measure VMAX – VGX VG(OFF) to VGS ≤ –3V, CGATE = 1nF (Note 5), V1 = V2 = 12V VG(ON) to VGS ≥ –1.5V, CGATE = 1nF (Note 6), V1 = V2 = 12V IPB = –1μA VPB(VOC) < VPB ≤ 28V 0V ≤ VPB < VPB(VOC) PB Falling From High to Low V2PREF_TH ILEAK l 3.3 3.8 ±3 V μA Ideal Diode Function VFR VRTO IG(SRC) IG(SNK) l l l l 10 –20 –2 2 20 –35 –5 5 35 –64 –10 10 mV mV μA μA IG(FASTSRC) Gate Fast Turn-Off Source Current l –0.5 –2.5 –10 mA IG(FASTSNK) Gate Fast Turn-On Sink Current l 0.3 0.7 2 mA VG(ON) VG(OFF) tG(ON) tG(OFF) Gate Clamp Voltage Gate Off Voltage Gate Turn-On Time Gate Turn-Off Time l l 6 7 0.2 8 0.4 10 10 V V μs μs 0.1 0.1 2.5 2.5 Pushbutton Pin (PB) VPB(VOC) IPB VTH_PB VHYS_PB PB Open-Circuit Voltage PB Input Current PB Input Threshold Voltage PB Input Hysteresis l l l l l 1 –1 0.65 10 4 –10 0.77 25 6 ±1 –25 0.8 150 V μA μA V mV 2952fa 3 LTC2952 ELECTRICAL CHARACTERISTICS SYMBOL IONT,OFFT tDB,ON/OFF PARAMETER ONT/OFFT Pull-Up/Pull-Down Current When Timer Is Active Internal Default On-Time/Off-Time Debounce Time Pins (ONT, OFFT) VONT, VOFFT = 0V (Pull-Up), VONT, VOFFT = 1.5V (Pull-Down) tDB,ON: CONT = Open, Measured Time Between PB Low → EN High, tDB,OFF: Measured Time Between PB Low → INT High CONT = 1500pF COFFT = 1500pF , l l 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) CONDITIONS MIN ±1.6 18 TYP ±2.0 26 MAX ±2.4 34 UNITS μA ms tONT,OFFT Additional Adjustable Turn-On/TurnOff Time (Note 7) VM Input Reset Threshold PFI, M1, M2, KILL Input Threshold Voltage PFI, M1, M2, KILL Input Hysteresis VM, PFI, M2, KILL Input Current M1 Input Pull-Up Current M1 Voltage Open-Circuit M1 Input Leak Current Input High Threshold Voltage Input Low Threshold Voltage High Low Input Current (Note 8) Hi-Z Input Current Leakage Current Voltage Output Low EN Leakage Current EN Voltage Output Low l 10 15 20 ms Accurate Comparator Input Pins (VM, PFI, M1, M2, KILL) VTH_VM VTH VHYS IIN_LKG IM1_SRC VM1(VOC) IM1_LKG VWDE(H,TH) VWDE(L,TH) IWDE(IN,HL) IWDE(IN,HZ) IOUT_LKG VOL IEN(LKG) VEN(VOL) Both Falling and Rising Falling l l l 0.492 0.492 5 –1.5 1 0.500 0.500 15 –3 4 0.508 0.508 25 ±0.1 –5 6 ±0.1 1.5 V V mV μA μA V μA V V μA μA V = 0.5V M1 = 1V M1 = 6V l l l l l l l Watchdog/Extend Pin (WDE) 0.3 ±25 ±10 ±1 0.4 ±1 0.4 0.05 140 1.1 200 1.6 5 150 150 0.3 260 2.1 10 VWDE = 0.7V, 1.1V VPIN = 5V IPIN = 1mA VEN = 28V, EN Sink Current Off IEN = 3mA V1 = 1.2V and/or V2 = 1.2V, IEN = 100μA l l l l l l l l l Open-Drain Output Pins (G1STAT, INT, RST, PFO) μA V μA V V ms s μs μs μs High Voltage Open-Drain Output Pin (EN) Voltage Monitor/Watchdog Timing tRST tWDE tWDE(PW MIN) tVM(UV) tPFI Reset Timeout Period Watchdog Timeout Period Minimum Period Between Consecutive Edges VM Undervoltage Detect to RST PFI Delay to PFO VM Less Than VTH_VM by More Than 1% PFI More or Less Than VPFI_TH by More Than 1% 2952fa 4 LTC2952 ELECTRICAL CHARACTERISTICS SYMBOL tINT(MIN) tKILL(PW) tKILL,ON BLANK tKILL, OFF WAIT tEN, LOCKOUT PARAMETER INT Minimum Pulse Width KILL Minimum Pulse Width KILL On Blanking (Note 9) KILL Wait Time (Note 10) Enable Lockout Time (Note 11) μP Handshake Timing Minimum Measured Time PB Rising to INT Rising Full Swing Pulse From 5V to 0V KILL = 0V, Measured Time Between EN Rising → EN Falling KILL = 1V, COFFT = OPEN, Measured Time Between INT Falling → EN Falling Measured Time Between EN Falling → EN Rising l l l l l 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) CONDITIONS MIN 10 TYP 50 150 270 270 270 400 400 400 MAX 250 500 530 530 530 UNITS μs μs ms ms 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. 2952fa 5 LTC2952 TIMING DIAGRAMS Ideal Diode Function – Gate Turn-On and Turn-Off Time 12.2V VS 12V 12.05V VGX VX = 12V tG(ON) 9V 5.3V tG(OFF) 10.5V 2952 TD01 12.2V 11.8V 12V 12.05V Pushbutton Debounce Times, KILL Wait Time and Enable Lockout Time with KILL Above Threshold PB EN INT tDB,ON tONT 0.775V 0.5*VPULL-UP 0.5*VPULL-UP t < tOFFT tDB,OFF tOFFT tDB,OFF tINT(MIN) tKILL, OFF WAIT t > tONT tDB,ON tEN, LOCKOUT 2952 TD02 KILL On Blanking with KILL Below Threshold KILL EN 0.5*VPULL-UP tKILL, ON BLANK 0.5*VPULL-UP 2952 TD03 2952fa 6 LTC2952 TIMING DIAGRAMS PFI and PFO PFI 0.515V 0.5*VPULL-UP tPFI tPFI 0.500V 0.5*VPULL-UP 2952 TD04 PFO WDE Minimum Pulse Width WDE tWDE(PW MIN) 2952 TD05 VM, WDE and RST VM WDE RST tRST 200ms tWDE 1.6s tRST 200ms