Datasheet LTC3528, LTC3528B (Analog Devices) - 5

LTC3528/LTC3528B
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted) Burst Mode Threshold Current Oscillator Frequency Change vs VIN vs VOUT RDS(ON) vs VOUT
60 0.50 450 VOUT = 5V NORMALIZED TO V 0.25 OUT = 3V 400 0 –0.25 350 40 –0.50 EXIT BURST –0.75 300 (mΩ) (mA) –1.00 PMOS I OUT ENTER BURST 250 –1.25 R DS(ON) 20 –1.50 200 FREQUENCY CHANGE (%) –1.75 NMOS 150 –2.00 0 –2.25 100 1 2 3 4 1.5 2 2.5 3 3.5 4 4.5 5 1.5 2 2.5 3 3.5 4 4.5 5 VIN (V) VOUT (V) VOUT (V) 3528 G11 3528 G12 3528 G13
Oscillator Frequency Change vs Temperature RDS(ON) Change vs Temperature VFB vs Temperature
2 40 1.200 1 30 1.199 0 20 –1 10 (V) 1.198 V FB CHANGE (%) –2 0 FREQUENCY CHANGE (%) 1.197 –3 –10 –4 –20 1.196 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (˚C) TEMPERATURE (˚C) TEMPERATURE (°C) 3528 G14 3528 G15 3528 G16
Burst Mode Quiescent Current vs Fixed Frequency VOUT Ripple and Start-Up Voltage vs Temperature VOUT (LTC3528) Inductor Current Waveforms
850 13.5 VIN = 1.2V 800 VOUT 20mV/DIV 12.5 I 750 L 200mA/DIV 700 CURRENT (µA) IN = 1.2V 2µs/DIV 3528 G19 V 11.5 VOUT = 3.3V START-UP VOLTAGE (mV) COUT = 22µF 650 CFF = 33pF IOUT = 100mA 600 10.5 –50 –25 0 25 50 75 100 125 1 2 3 4 5 TEMPERATURE (°C) VOUT (V) 3528 G17 3528 G18 3528fd 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts