Datasheet LTC4012, LTC4012-1, LTC4012-2 (Analog Devices) - 6

LTC4012/ LTC4012-1/LTC4012-2 typical perForMance characteristics
(TA = 25°C unless otherwise noted. L = IHLP-2525 6.8µH) Efficiency at DCIN = 20V, BAT = 8V Efficiency at DCIN = 20V, BAT = 12V
100 10000 100 10000 RSENSE = 33mΩ RSENSE = 33mΩ RIN = 3.01k RIN = 3.01k 95 POWER LOSS(mW) 95 EFFICIENCY POWER LOSS(mW) EFFICIENCY 90 POWER LOSS 1000 90 POWER LOSS 1000 EFFICIENCY (%) EFFICIENCY (%) 85 85 80 100 80 100 0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3 CHARGE CURRENT (A) CHARGE CURRENT (A) 4012 G01 4012 G02
Efficiency at DCIN = 20V, BAT = 16V VFB Line Regulation
100 10000 0.10 LTC4012 TEST CIRCUIT 0.08 EFFICIENCY 0.06 95 POWER LOSS(mW) 0.04 0.02 90 1000 0 POWER LOSS ERROR (%) –0.02 EFFICIENCY (%) V FB –0.04 85 –0.06 RSENSE = 33mΩ RIN = 3.01k –0.08 80 100 –0.10 0 0.5 1 1.5 2 2.5 3 5 10 15 20 25 30 CHARGE CURRENT (A) CLP PIN VOLTAGE (V) 4012 G03 4012 G04
FBDIV Pin RON vs Battery Voltage Battery Load Dump Charge Current Accuracy
300 2 CLP = BAT + 3V 275 (CLP ≥ 6V) 2A 1 TAGE 250 /DIV) 12.1V 1A 0 225 Y VOL 1A DCIN = 24V –1 R 200 TTER (500mV 3A PROG = 35.7k (Ω) BA RECONNECT –2 DCIN = 12V R ON 175 LOAD RPROG = 26.7k STATE DISCONNECT –3 150 TIME (1ms/DIV) 4012 G06 CLP = 20V 125 –4 VOUT = 12.3V CHARGE CURRENT ERROR (%) 100 –5 RSENSE = 33mΩ RIN = 3.01k 75 –6 0 5 10 15 20 25 0 2 4 6 8 10 12 14 16 18 20 22 24 BATTERY VOLTAGE (V) BATTERY VOLTAGE (V) 4012 G05 4012 G07 4012fa Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Test Circuits Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts