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LTC4121-4.2 Datasheet(PDF) 4 Page - Linear Technology |
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LTC4121-4.2 Datasheet(HTML) 4 Page - Linear Technology |
4 / 30 page LTC4121/LTC4121-4.2 4 4121fa 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 ILOWBAT Low Battery Linear Charge Current VFB < VTRKL, VBAT = 2.6V (LTC4121) (Note 6) 6 9 16 mA VBATSNS < VTRKL_4.2, VBAT = 2.6V (LTC4121-4.2) VLOWBAT Low Battery Threshold Voltage VBAT Rising (LTC4121) VBATSNS Rising (LTC4121-4.2) l 2.15 2.21 2. 28 V Hysteresis 147 mV ITRKL Switch Mode Trickle Charge Current VLOWBAT < VBAT, VFB < VTRKL (LTC4121) (Note 6) ICHG/10 mA VLOWBAT < VBATSNS < VTRKL_42 (LTC4121-4.2) PROG Pin Servo Voltage in Trickle Charge VLOWBAT < VBAT, VFB > VTRKL (LTC4121) (Note 6) 122 mV VLOWBAT < VBATSNS < VTRKL_42 (LTC4121-4.2) VTRKL Trickle Charge Threshold (LTC4121) VFB Rising (Note 6) l 1.65 1.68 1.71 V Hysteresis (LTC4121) VFB Falling (Note 6) 50 mV VTRKL_4.2 Trickle Charge Threshold (LTC4121-4.2) VBATSNS Rising l 2.86 2.91 2.98 V Hysteresis (LTC4121-4.2) VBATSNS Falling 88 mV hC/10 End of Charge Indication Current Ratio (Note 7) 0.1 mA/mA Safety Timer Termination Period 1.3 2.0 2.8 hrs Bad Battery Termination Timeout 19 30 42 min Switcher fOSC Switching Frequency FREQ = INTVCC l 1.0 1.5 2.0 MHz FREQ = GND l 0.5 0.75 1.0 MHz tMIN_ON Minimum Controllable On-Time 120 ns Duty Cycle Maximum 94 % Top Switch RDSON ISW = –100mA 0.8 Ω Bottom Switch RDSON ISW = 100mA 0.5 Ω IPEAK Peak Inductor Current Limit Measured Across RSNS with a 15µH Inductor in Series with RSNS (Note 10) 585 1050 1250 mA ISW Switch Pin Current (Note 9) IN Open-Circuit, VBAT = VSW = 4.2V (LTC4121-4.2) l 7 15 µA IN Open-Circuit, VBAT = VSW = 8.4V (LTC4121) l 15 30 µA Status Pins FAULT, CHRG Pin Output Voltage Low I = 2mA 550 mV Pin Leakage Current V = 43V, Pin High-Impedance 0 1 µA NTC Cold Temperature VNTC/VINTVCC Fault Rising VNTC Threshold l 73 74 75 %INTVCC Falling VNTC Threshold 72 %INTVCC Hot Temperature VNTC/VINTVCC Fault Falling VNTC Threshold l 35.5 36.5 37.5 %INTVCC Rising VNTC Threshold 37.5 %INTVCC NTC Disable Voltage Falling VNTC Threshold l 1 2 3 %INTVCC Rising VNTC Threshold 3 %INTVCC NTC Input Leakage Current VNTC = VINTVCC –50 50 nA |
Similar Part No. - LTC4121-4.2_15 |
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Similar Description - LTC4121-4.2_15 |
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