Datasheet LT1571 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Constant-Current/Constant-Voltage Battery Charger with Preset Voltage and Termination Flag |
| Pages / Page | 16 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Reference Voltage vs Junction. … |
| File Format / Size | PDF / 220 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Reference Voltage vs Junction. Efficiency of Figure 4 Circuit. Temperature
Model Line for this Datasheet
Text Version of Document
LT1571 Series
W U TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage vs Junction Efficiency of Figure 4 Circuit Temperature Boost Current vs Switch Current
100 2.470 40 VCC = 16V 98 VCC = 15V (EXCLUDING DISSIPATION ON INPUT DIODE D3) 35 2.468 V 96 V BOOST = 26V BAT = 8.4V (V 30 X = 10V) 94 2.466 92 25 90 2.464 20 VBOOST = 21V 88 15 (VX = 5V) EFFICIENCY (%) 2.462 86 BOOST CURRENT (mA) REFERENCE VOLTAGE (V) 10 84 2.460 82 5 80 2.458 0 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 0 25 50 75 100 125 150 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 IBAT (A) JUNCTION TEMPERATURE (°C) SWITCH CURRENT (A) 1571 G01 1571 G02 1571 G03
Switching Frequency vs Temperature VREF Line Regulation
∆
VOVP vs IVA (Voltage Amplifier)
510 0.003 4 505 0.002 LT1571-5 500 3 0.001 495 ALL TEMPERATURES (V) (mV) 0 2 REF∆V OVP∆V 125°C 205 FREQUENCY (kHz) LT1571-1, LT1571-2 –0.001 200 1 –0.002 25°C 195 190 –0.003 0 –20 0 20 40 60 80 100 120 140 0 5 10 15 20 25 30 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 JUNCTION TEMPERATURE (°C) VCC (V) IVA (mA) 1571 G04 1571 G05 1571 G06
Maximum Duty Cycle VC Pin Characteristic PROG Pin Characteristic
98 –1.20 6 LT1571-1, LT1571-2 –1.08 97 (VX = 5V) –0.96 96 –0.84 125°C 95 –0.72 –0.60 94 (mA) (mA) 0 25°C I VC –0.48 93 I PROG DUTY CYCLE (%) –0.36 92 –0.24 –0.12 91 0 90 0.12 – 6 0 20 40 60 80 100 120 140 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 2 3 4 5 JUNCTION TEMPERATURE (°C) VC (V) VPROG (V) 1571 G09 1571 G08 1571 G09 5
W U TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage vs Junction Efficiency of Figure 4 Circuit Temperature Boost Current vs Switch Current
100 2.470 40 VCC = 16V 98 VCC = 15V (EXCLUDING DISSIPATION ON INPUT DIODE D3) 35 2.468 V 96 V BOOST = 26V BAT = 8.4V (V 30 X = 10V) 94 2.466 92 25 90 2.464 20 VBOOST = 21V 88 15 (VX = 5V) EFFICIENCY (%) 2.462 86 BOOST CURRENT (mA) REFERENCE VOLTAGE (V) 10 84 2.460 82 5 80 2.458 0 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 0 25 50 75 100 125 150 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 IBAT (A) JUNCTION TEMPERATURE (°C) SWITCH CURRENT (A) 1571 G01 1571 G02 1571 G03
Switching Frequency vs Temperature VREF Line Regulation
∆
VOVP vs IVA (Voltage Amplifier)
510 0.003 4 505 0.002 LT1571-5 500 3 0.001 495 ALL TEMPERATURES (V) (mV) 0 2 REF∆V OVP∆V 125°C 205 FREQUENCY (kHz) LT1571-1, LT1571-2 –0.001 200 1 –0.002 25°C 195 190 –0.003 0 –20 0 20 40 60 80 100 120 140 0 5 10 15 20 25 30 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 JUNCTION TEMPERATURE (°C) VCC (V) IVA (mA) 1571 G04 1571 G05 1571 G06
Maximum Duty Cycle VC Pin Characteristic PROG Pin Characteristic
98 –1.20 6 LT1571-1, LT1571-2 –1.08 97 (VX = 5V) –0.96 96 –0.84 125°C 95 –0.72 –0.60 94 (mA) (mA) 0 25°C I VC –0.48 93 I PROG DUTY CYCLE (%) –0.36 92 –0.24 –0.12 91 0 90 0.12 – 6 0 20 40 60 80 100 120 140 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 2 3 4 5 JUNCTION TEMPERATURE (°C) VC (V) VPROG (V) 1571 G09 1571 G08 1571 G09 5
