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LTC4091 Datasheet(PDF) 3 Page - Linear Technology |
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LTC4091 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 26 page  LTC4091 3 4091fa For more information www.linear.com/LTC4091 The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = RUN/SS = 12V, BOOST = 17V, VBAT = 3.7V and RPROG = 105k, unless otherwise noted. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Step-Down Regulator VVIN Operating Supply Voltage l 6 36 V VOVLO VIN Overvoltage Lockout Threshold l 36 38 40 V IVIN VIN Bias Current Shutdown; RUN/SS = 0.2V Charger Terminated, RHVPR = 4.99k 0.01 1.1 1 µA mA VOUT Output Voltage with VIN Present Assumes HVOUT to OUT Connection 3.45 VBAT+0.1 4.45 V fSW Switching Frequency RT = 8.66k RT = 29.4k RT = 187k 2.1 900 160 2.4 1000 200 2.7 1150 240 MHz kHz kHz tOFF Minimum Switch Off-Time l 60 150 ns ISW(MAX) Switch Current Limit 2.5 3.8 5.0 A VSAT Switch VCESAT ISW = 2A 500 mV IR Boost Schottky Reverse Leakage SW = 10V, HVOUT = 0V 0.02 2 µA VB(MIN) Minimum Boost Voltage (Note 6) l 1.5 2.1 V IBST BOOST Pin Current ISW = 1A 22 35 mA Battery Management (Note 8) IBAT Battery Drain Current VVIN = 0V, BAT Powers OUT, No Load l 60 100 µA VCHG VBAT Regulated Output Voltage IBAT = 2mA; V4P1 = Open IBAT = 2mA; V4P1 = BAT 4.148 4.048 4.200 4.100 4.252 4.152 V V ICHG Constant-Current Mode Charge Current RPROG = 105k, No Load RPROG = 52.3k, No Load; 0 ≤ TA ≤ 85°C l l 465 880 500 1000 550 1100 mA mA ICHG(MAX) Maximum Charge Current (Note 5) 1.5 A VPROG PROG Pin Servo Voltage RPROG = 105k RPROG = 52.3k l l 0.98 0.98 1.00 1.00 1.02 1.02 V V kEOC Ratio of End-of-Charge Indication Current to Charge Current VBAT = VCHG (4.2V) l 0.08 0.1 0.13 mA/mA ITRKL Trickle Charge Current BAT = 2V 35 50 75 mA VTRKL Trickle Charge Threshold Voltage BAT Rising l 2.75 2.9 3.0 V VCEN Charger Enable Threshold Voltage (VOUT – VBAT) Falling; VBAT = 4V (VOUT – VBAT) Rising; VBAT = 4V 55 80 mV mV ΔVRECHRG Recharge Battery Threshold Voltage Threshold Voltage Relative to VCHG l –65 –100 –150 mV tTIMER TIMER Accuracy VBAT = 4.3V –10 10 % Recharge Time Percent of Total Charge Time 50 % Low Battery Trickle Charge Time Percent of Total Charge Time, VBAT < VTRKL 25 % TLIM Junction Temperature in Constant Temperature Mode 105 °C Internal Ideal Diode RDIO,ON On Resistance VBAT to VOUT IOUT = 2A 75 mΩ VFWD Voltage Forward Drop (VBAT – VOUT) IOUT = 5mA IOUT = 100mA IOUT = 1000mA l 10 30 40 75 50 mV mV mV |
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