LTC2952CF

LTC2952 Push Button PowerPathTM Controller with Supervisor FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTION The LTC®2952 is a power management device that features three main functions: push-button on/off control of system power, ideal diode power paths and system monitoring. The LTC2952’s push-button 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 power paths 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. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Push-Button 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 Push-Button On/Off Timers Simple Interface Allows Graceful µP Shutdown Extendable House Keeping Wait Time Prior to Shutdown 200ms Reset Delay and 1.6s Watchdog Time Out ±8kV HBM ESD on ⎯P⎯B Input 20 pin TSSOP and QFN (4mm × 4mm) Packages APPLICATIONS ■ ■ ■ ■ ■ Desktop and Notebook Computers Portable Instrumentations Cell Phones, PDA and Handheld Computers Servers and Computer Peripherals Battery Backup Systems TYPICAL APPLICATION Push-Button Controller with Automatic Switchover Between Adapter and Battery ADAPTER 3V TO 25V VIN Si6993DQ VOUT 1k 365k 511k G1 G2 V1 V2 VS PFI EN VM D1 M1 M2 PB ONT *22nF GND RST LTC2952 G1STAT PFO INT KILL WDE OFFT *68nF *OPTIONAL 2952 TA01 Ideal Diode vs Schottky Diode Forward Voltage Drop 1 CONSTANT RON CURRENT (A) 2.5V LT1767-2.5 SHDN Si6993DQ 100k D2 100k D3 1k 1k 10k 12V BATTERY IDEAL DIODE CONSTANT VOLTAGE SCHOTTKY DIODE 0 µP 0.02 FORWARD VOLTAGE (V) 0.50 2952 TA01b 2952f 1 LTC2952 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltages V1, V2, VS ............................................. –0.3V to 30V Input Voltages ⎯P⎯B .................................... –6V to MAX (V1, V2, VS) V ONT, OFFT ................................................ –0.3V to 3V M1, M2, PFI, VM, WDE, ⎯K⎯I⎯L⎯L................... –0.3V to 7V Output Voltages G1, G2, EN .................... –0.3V to MAX (V1, V2, VS) V G1STAT, ⎯P⎯F⎯O, ⎯R⎯S⎯T, ⎯I⎯N⎯T ............................ –0.3V to 7V Input Currents ⎯P⎯B ...................................................... –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 PACKAGE/ORDER INFORMATION TOP VIEW G1STAT TOP VIEW KILL M1 M2 M2 M1 KILL VM PFI WDE PB RST PFO 1 2 3 4 5 6 7 8 9 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 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 PART NUMBER LTC2952CF LTC2952IF F20 PART MARKING LTC2952CF LTC2952IF ORDER PART NUMBER LTC2952CUF LTC2952IUF UF20 PART MARKING 2952 2952 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. 2952f 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 ● 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. ● ● MIN 2.7 TYP 24 MAX 28 60 UNITS V µA ● ● ● 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 Power Path Forward Regulation Voltage Ideal Diode Power Path 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 I⎯P⎯B = –1µA V⎯P⎯B(VOC) < V⎯P⎯B ≤ 28V 0V ≤ V⎯P⎯B < V⎯P⎯B(VOC) ⎯PB Falling From High to Low ⎯ V2PREF_TH ILEAK ● 3.3 3.8 ±3 V µA Ideal Diode Function VFR VRTO IG(SRC) IG(SNK) ● ● ● ● 10 –20 –2 2 20 –35 –5 5 35 –64 –10 10 mV mV µA µA IG(FASTSRC) Gate Fast Turn-Off Source Current ● –0.5 –2.5 –10 mA IG(FASTSNK) Gate Fast Turn-On Sink Current ● 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 ● ● 6 7 0.2 8 0.4 10 10 V V µs µs 0.1 0.1 2.5 2.5 Push-Button Pin (⎯P⎯B) ⎯P⎯B Open Circuit Voltage V⎯P⎯B(VOC) ⎯⎯ PB Input Current I⎯P⎯B VTH_⎯P⎯B VHYS_⎯P⎯B ⎯P⎯B Input Threshold Voltage ⎯PB Input Hysteresis ⎯ ● ● ● ● ● 1 –1 0.65 10 4 –10 0.77 25 6 ±1 –25 0.8 150 V µA µA V mV 2952f 3 LTC2952 ELECTRICAL CHARACTERISTICS SYMBOL IONT,OFFT tDB,ON/OFF PARAMETER Debounce Time Pins (ONT, OFFT) ONT/OFFT Pull-Up/Pull-Down Current VONT, VOFFT = 0V (Pull-Up), VONT, VOFFT = 1.5V When Timer is Active (Pull-Down) Internal Default On-Time/Off-Time tDB,ON: CONT = Open, Measured Time Between ⎯P⎯B Low → EN High, tDB,OFF: Measured Time Between ⎯P⎯B Low → INT High ● ● The ● 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/TurnCONT = 1500pF, COFFT = 1500pF Off Time (Note 7) ⎯ ⎯⎯ Accurate Comparator Input Pins (VM, PFI, M1, M2, KIL⎯L) 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) VM Input Reset Threshold ⎯ ⎯⎯ ⎯ PFI, M1, M2, KILL Input Threshold Voltage PFI, M1, M2, ⎯K⎯I⎯L⎯L Input Hysteresis VM, PFI, M2, ⎯K⎯I⎯L⎯L 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) 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 Voltage Monitor/Watchdog Timing tRST tWDE tWDE(PW MIN) tVM(UV) tPFI Reset Time-Out Period Watch-Dog Time-Out Period Minimum Period Between Consecutive Edges VM Undervoltage Detect to ⎯R⎯S⎯T PFI Delay to ⎯P⎯F⎯O VM Less Than VTH_VM by more than 1% PFI More or Less Than VPFI_TH by more than 1% M1 = 6V Both Falling and Rising Falling ● 10 15 20 ms ● ● ● 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 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● Watch-Dog/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 High Z Input Current ⎯⎯ ⎯ ⎯ Open Drain Output Pins (G1STAT, INT, R⎯S⎯T, ⎯P⎯F⎯O) Leakage Current Voltage Output Low EN Leakage Current EN Voltage Output Low µA V µA V V ms s µs µs µs High Voltage Open Drain Output Pin (EN) 2952f 4 LTC2952 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER µP Handshake Timing ⎯⎯ IN⎯T Minimum Pulse Width t⎯IN⎯T(MIN) t⎯K⎯I⎯L⎯L(PW) t⎯K⎯I⎯L⎯L,ON BLANK t⎯K⎯I⎯L⎯L, OFF WAIT tEN, LOCKOUT ⎯K⎯I⎯L⎯L Minimum Pulse Width ⎯K⎯I⎯L⎯L ON Blanking (Note 9) ⎯K⎯I⎯L⎯L Wait Time (Note 10) Enable Lockout Time (Note 11) The ● 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 Minimum Measured Time ⎯P⎯B Rising to ⎯I⎯N⎯T Rising Full Swing Pulse From 5V to 0V ⎯K⎯I⎯L⎯L = 0V, Measured Time Between EN Rising → EN Falling ⎯KILL = 1V, COFFT = OPEN, Measured Time ⎯⎯ ⎯ Between ⎯I⎯N⎯T Falling → EN Falling Measured Time Between EN Falling → EN Rising ● ● ● ● ● MIN 10 TYP 50 150 MAX 250 500 530 530 530 UNITS µs µs ms ms ms 270 270 270 400 400 400 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 ⎯K⎯I⎯L⎯L Blanking Time is the waiting period immediately following the EN pin switching high; at the end of this period the input to the ⎯K⎯I⎯L⎯L needs to be high to indicate that the system has powered up properly, otherwise the EN pin is immediately switched low. Note 10: The ⎯K⎯I⎯L⎯L 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. 2952f 5 LTC2952 TI I G DIAGRA S 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 Push-Button Debounce Times, ⎯K⎯I⎯L⎯L Wait Time and Enable Lockout Time with ⎯K⎯I⎯L⎯L 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 6 W UW 12.2V 11.8V 12V 12.05V ⎯KI⎯L⎯L ON Blanking with ⎯K⎯I⎯L⎯L Below Threshold ⎯ KILL EN 0.5*VPULL-UP tKILL, ON BLANK 0.5*VPULL-UP 2952 TD03 2952f LTC2952 TI I G DIAGRA S PFI and ⎯P⎯F⎯O PFI 0.515V 0.5*VPULL-UP tPFI tPFI 0.500V 0.5*VPULL-UP 2952 TD04 VM WDE DON'T CARE DON'T CARE DON'T CARE DON'T CARE RST tRST 200ms tWDE 1.6s tRST 200ms