Datasheet LTC1704, LTC1704B (Analog Devices) - 6

LTC1704/LTC1704B
W U TYPICAL PERFOR A CE CHARACTERISTICS Linear Regulator Dropout Voltage VOUTREG Load Regulation vs Temperature VOUTREG 0.1A to 2.1A Load Step
0.5 0.03 1.1 IREGDR = –30mA V 0 0 1.0 REGDR = 3.3V VOUT 0.9 –0.5 – 0.03 ∆VOUTREG 0.8 (mV) (V) –1.0 –0.07 0.7 I –1.5 –0.10 (%) LOAD OUTREG DROPOUT ∆V V 0.6 –2.0 –0.13 T 0.5 A = 25°C V –2.5 OUTREG = 1.5V –0.17 50µs/DIV 1704 G20 I 0.4 REGILM = 9µA QEXT = D44H11 CH1: VOUTREG = 1.5V, AC 50mV/DIV –3.0 –0.20 0.3 CH2: 0.1A to 2.1A LOAD, 1A DIV 0 0.4 0.8 1.2 1.6 2 – 50 – 25 0 25 50 75 100 125 IOUTREG (A) TEMPERATURE (°C) 1704 G18 1704 G19
Linear Regulator Start-Up Time Minimum VCC vs VOUTREG vs CDELAY IREGDR vs IREGILM
5.5 1100 35 IREGILM = 9µA TA = 25°C I 1000 OUTREG = 2A VOUTREG = 1.5V ∆V 30 OUTREG = –1% 900 5.0 QEXT = D44H11 800 µs) 25 (V) 700 CC 4.5 IREGILM = 6.2µA 600 20 (mA) 500 15 4.0 IREGILM = 9µA 400 I REGDR MINIMUM V TA = –40°C START-UP TIME ( 300 10 3.5 200 TA = 25°C 5 100 3.0 0 0 0.9 1.3 1.7 2.1 2.5 2.9 3.3 0 2000 4000 6000 8000 10000 0 2 4 6 8 10 12 VOUTREG (V) CDELAY (pF) IREGILM (µA) 1704 G21 1704 G22 1704 G23
Linear Regulator Current Limit IREGDR vs VREGFB Threshold vs Temperature VOUTREG vs Load Current
30 3.0 2.0 TA = 25°C VREGDR = 0V 25 2.5 1.5 20 IREGILM = 9µA (V) (mA) 15 2.0 1.0 OUTREG I REGDR V 10 T IREGILM = 6.2µA 1.5 A = 25°C V 0.5 INREG = 1.8V VINREG = 1.8V 5 CURRENT LIMIT THRESHOLD (A) VOUTREG = 1.5V VOUTREG = 1.5V IREGILM = 9µA IREGILM = 9µA QEXT = D44H11 QEXT = D44H11 0 1.0 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 –50 –25 0 25 50 75 100 125 0 0.5 1 1.5 2 2.5 3 V TEMPERATURE ( REGFB (V) °C) IOUTREG (A) 1704 G28 1704 G24 1704 G25 1704bfa 6