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LTC4121 Datasheet(PDF) 3 Page - Linear Technology |
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LTC4121 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 30 page  LTC4121/LTC4121-4.2 3 4121fc For more information www.linear.com/LTC4121 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = VRUN = 15V, VCHGSNS = VBAT = 4V, RPROG = 3.01k, VFB = 2.29V (LTC4121), VBATSNS = 4V (LTC4121-4.2). Current into a pin is positive out of a pin is negative. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Operating Input Supply Range l 4.4 40 V Battery Voltage Range LTC4121 (Note 3) 0 18 V LTC4121-4.2 0 4.2 V IIN DC Supply Current Switching: FREQ = GND 3.5 mA Standby Mode: (Note 4) l 142 260 µA Sleep Mode: (Note 4) LTC4121-4.2: VBATSNS = 4.4V LTC4121: VFB = 2.51V (Note 6) l 60 110 µA Disabled Mode: VSD < VRUN < VEN (Note 4) l 37 80 µA Shutdown Mode: (Note 4) l 20 40 µA ∆VDUVLO Differential Undervoltage Lockout VIN – VBAT Falling, VIN = 5V (LTC4121) VIN – VBATSNS Falling, VIN = 5V (LTC4121-4.2) l 20 80 160 mV Hysteresis VIN – VBAT Rising, VIN = 5V (LTC4121) VIN – VBATSNS Rising, VIN = 5V (LTC4121-4.2) 115 mV UVINTVCC INTVCC Undervoltage Lockout (Note 5) INTVCC Rising, VIN = INTVCC + 100mV l 4.00 4.15 4.26 V Hysteresis INTVCC Falling 220 mV Battery Charger IBAT BAT Standby Current Standby Mode (LTC4121) (Notes 4, 8, 9) Standby Mode (LTC4121-4.2) (Notes 4, 8, 9) l l 2.5 50 4.5 1000 µA nA BAT Shutdown Current Shutdown Mode (LTC4121) (Notes 4, 8, 9) Shutdown Mode (LTC4121-4.2) (Notes 4, 8, 9) l l 1100 10 2000 1000 nA nA IBATSNS BATSNS Standby Current (LTC4121-4.2) Standby Mode (Notes 4, 8, 9) l 5.4 10 µA BATSNS Shutdown Current (LTC4121-4.2) Shutdown Mode (Notes 4, 8, 9) l 1100 2000 nA IFB Feedback Pin Bias Current (LTC4121) VFB = 2.5V (Note 6) l 25 60 nA IFBG_LEAK Feedback Ground Leakage Current (LTC4121) Shutdown Mode (Note 4) l 1 µA RFBG Feedback Ground Return Resistance (LTC4121) l 1000 2000 Ω VFB(REG) Feedback Pin Regulation Voltage (LTC4121) (Note 6) 2.393 2.400 2.407 V l 2.370 2.418 V VFLOAT Regulated Float Voltage (LTC4121-4.2) 4.188 4.200 4.212 V l 4.148 4.231 V ICHG Battery Charge Current RPROG = 3.01k l 383 402 421 mA RPROG = 24.3k l 45 50 55 mA VRCHG Battery Recharge Threshold VFB Falling Relative to VFB(REG) (LTC4121) l –38 –49 –62 mV VRCHG_4.2 VBATSNS Falling Relative to VFLOAT (LTC4121-4.2) l –70 –93 –114 mV hPROG Ratio of BAT Current to PROG Current VTRKL < VFB < VFB(REG) (LTC4121), VTRKL_42 < VBATSNS < VFLOAT (LTC4121-4.2) 988 mA/mA VPROG PROG Pin Servo Voltage l 1.206 1.227 1.248 V RSNS CHGSNS-BAT Sense Resistor IBAT = –100mA 300 mΩ |
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