Datasheet LTC4121, LTC4121-4.2 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | 40V 400mA Synchronous Step-Down Battery Charger |
| 页数 / 页 | 30 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 383 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC4121/LTC4121-4.2
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 = l 60 110 µA 4.4V LTC4121: VFB = 2.51V (Note 6) 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) l 20 80 160 mV VIN – VBATSNS Falling, VIN = 5V (LTC4121-4.2) Hysteresis VIN – VBAT Rising, VIN = 5V (LTC4121) 115 mV VIN – VBATSNS Rising, VIN = 5V (LTC4121-4.2) 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) l 2.5 4.5 µA Standby Mode (LTC4121-4.2) (Notes 4, 8, 9) l 50 1000 nA BAT Shutdown Current Shutdown Mode (LTC4121) (Notes 4, 8, 9) l 1100 2000 nA Shutdown Mode (LTC4121-4.2) (Notes 4, 8, 9) l 10 1000 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 Shutdown Mode (Note 4) l 1 µA (LTC4121) RFBG Feedback Ground Return Resistance l 1000 2000 Ω (LTC4121) VFB(REG) Feedback Pin Regulation Voltage (Note 6) 2.393 2.400 2.407 V (LTC4121) 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), 988 mA/mA VTRKL_42 < VBATSNS < VFLOAT (LTC4121-4.2) VPROG PROG Pin Servo Voltage l 1.206 1.227 1.248 V RSNS CHGSNS-BAT Sense Resistor IBAT = –100mA 300 mΩ 4121fc For more information www.linear.com/LTC4121 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Applications Examples Package Description Typical Application Related Parts
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 = l 60 110 µA 4.4V LTC4121: VFB = 2.51V (Note 6) 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) l 20 80 160 mV VIN – VBATSNS Falling, VIN = 5V (LTC4121-4.2) Hysteresis VIN – VBAT Rising, VIN = 5V (LTC4121) 115 mV VIN – VBATSNS Rising, VIN = 5V (LTC4121-4.2) 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) l 2.5 4.5 µA Standby Mode (LTC4121-4.2) (Notes 4, 8, 9) l 50 1000 nA BAT Shutdown Current Shutdown Mode (LTC4121) (Notes 4, 8, 9) l 1100 2000 nA Shutdown Mode (LTC4121-4.2) (Notes 4, 8, 9) l 10 1000 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 Shutdown Mode (Note 4) l 1 µA (LTC4121) RFBG Feedback Ground Return Resistance l 1000 2000 Ω (LTC4121) VFB(REG) Feedback Pin Regulation Voltage (Note 6) 2.393 2.400 2.407 V (LTC4121) 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), 988 mA/mA VTRKL_42 < VBATSNS < VFLOAT (LTC4121-4.2) VPROG PROG Pin Servo Voltage l 1.206 1.227 1.248 V RSNS CHGSNS-BAT Sense Resistor IBAT = –100mA 300 mΩ 4121fc For more information www.linear.com/LTC4121 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Applications Examples Package Description Typical Application Related Parts