Datasheet LTC4121, LTC4121-4.2 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | 40V 400mA Synchronous Step-Down Battery Charger |
| Pages / Page | 30 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 383 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Typical Battery Charge Current. Efficiency vs IBAT
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Text Version of Document
LTC4121/LTC4121-4.2
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Typical Battery Charge Current Efficiency vs IBAT vs Temperature
100 450 400 90 VIN = 15V 350 VBAT = 3.8V 80 300 RPROG = 3.01k RPROG = 6.04k 250 RPROG = 12.1k 70 VIN = 9V (mA) RPROG = 24.3k VIN = 14V 200 V I CHG EFFICIENCY (%) IN = 19V 60 VIN = 24V 150 LTC4121-42 100 50 VBAT = 4.2V FREQ = LOW 50 LSW = SLF12575T-470M2R7 40 0 0 100 200 300 400 –40 –25 –10 5 20 35 50 65 80 95 110 125 IBAT (mA) TEMPERATURE (°C) 4121 G10 4121 G11
Typical Solar Charging Cycle Burst Mode Trigger Current
450 4.5 100 400 VBAT 4.0 90 350 3.5 80 I V 70 300 BAT 3.0 BAT , V 60 250 2.5 CHRG (mA) 50 Y CURRENT (mA) 200 2.0 (V) V I BAT 40 BAT = 500mAHr CHRG TTER 150 1.5 LSW = TDK SLF7045 30 BA 100 47µH 1.0 R 20 FB1 = 732k, 50 R R FB2 = 976k 0.5 10 PROG = 3.01kΩ R R PROG = 3.01k PROG = 6.04kΩ 0 0 0 0 0.5 1 1.5 2 2.5 3 3.5 5 10 15 20 25 30 35 40 TIME (HR) VIN (V) 4121 G12 4121 G13
IN Pin Shutdown Current IN Pin Disabled Current Typical Burst Mode Waveforms vs Input Voltage vs Input Voltage
80 80 SHUTDOWN 130°C DISABLED 130°C 70 SHUTDOWN 25°C 70 DISABLED 25°C SHUTDOWN –45°C DISABLED –45°C V 60 60 SW 5V/DIV 50 50 VPROG (µA) 40 (µA) 40 200mV/DIV I IN I IN 30 30 ISW 200mA/DIV 20 20 4121 G14 4µs/DIV 10 10 VIN = 15V VBAT = 4.2V 0 0 IBAT = 38mA 5 10 15 20 25 30 35 40 5 10 15 20 25 30 35 40 FREQ = GND VIN (V) VIN (V) 4121 G15 4121 G16 4121fc For more information www.linear.com/LTC4121 7 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
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Typical Battery Charge Current Efficiency vs IBAT vs Temperature
100 450 400 90 VIN = 15V 350 VBAT = 3.8V 80 300 RPROG = 3.01k RPROG = 6.04k 250 RPROG = 12.1k 70 VIN = 9V (mA) RPROG = 24.3k VIN = 14V 200 V I CHG EFFICIENCY (%) IN = 19V 60 VIN = 24V 150 LTC4121-42 100 50 VBAT = 4.2V FREQ = LOW 50 LSW = SLF12575T-470M2R7 40 0 0 100 200 300 400 –40 –25 –10 5 20 35 50 65 80 95 110 125 IBAT (mA) TEMPERATURE (°C) 4121 G10 4121 G11
Typical Solar Charging Cycle Burst Mode Trigger Current
450 4.5 100 400 VBAT 4.0 90 350 3.5 80 I V 70 300 BAT 3.0 BAT , V 60 250 2.5 CHRG (mA) 50 Y CURRENT (mA) 200 2.0 (V) V I BAT 40 BAT = 500mAHr CHRG TTER 150 1.5 LSW = TDK SLF7045 30 BA 100 47µH 1.0 R 20 FB1 = 732k, 50 R R FB2 = 976k 0.5 10 PROG = 3.01kΩ R R PROG = 3.01k PROG = 6.04kΩ 0 0 0 0 0.5 1 1.5 2 2.5 3 3.5 5 10 15 20 25 30 35 40 TIME (HR) VIN (V) 4121 G12 4121 G13
IN Pin Shutdown Current IN Pin Disabled Current Typical Burst Mode Waveforms vs Input Voltage vs Input Voltage
80 80 SHUTDOWN 130°C DISABLED 130°C 70 SHUTDOWN 25°C 70 DISABLED 25°C SHUTDOWN –45°C DISABLED –45°C V 60 60 SW 5V/DIV 50 50 VPROG (µA) 40 (µA) 40 200mV/DIV I IN I IN 30 30 ISW 200mA/DIV 20 20 4121 G14 4µs/DIV 10 10 VIN = 15V VBAT = 4.2V 0 0 IBAT = 38mA 5 10 15 20 25 30 35 40 5 10 15 20 25 30 35 40 FREQ = GND VIN (V) VIN (V) 4121 G15 4121 G16 4121fc For more information www.linear.com/LTC4121 7 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
