Datasheet ADP1611 (Analog Devices) - 8

ADP1611 2.0 300 FSW = 1.23kHz VFB = 1V 1.8 250 1.6 200 VIN = 5.5V V) NT (mA) m 1.4 YS ( 150 CURRE Y 1.2 LO H L V P U P V 100 U IN = 3.3V S 1.0 50 0.8 VIN = 2.5V 0.6
04906-016
0
04906-019
–40 –15 10 35 60 85 –40 –15 10 35 60 85 AMBIENT TEMPERATURE (
°
C) AMBIENT TEMPERATURE (
°
C)
Figure 16. Supply Current vs. Ambient Temperature Figure 19. UVLO Hysteresis vs. Ambient Temperature
1.0 VIN = 3.3V 0.9 SD = 0.4V VSW = 20V
µ
A) 0.8 3 NT ( 0.7 0.6 CURRE 0.5 CH1 = IL 500mA/DIV V AKAGE 0.4 IN = 5V, VOUT = 20V, CH2 = OUTPUT RIPPLE 100mV/DIV ILOAD = 200mA, FSW = 700kHz, 1 CH3 = S L = 10
µ
H, C 0.3 W 10V/DIV OUT = 10
µ
F ITCH LE W 0.2 2 S 0.1
04906-020
CH1 10.0mV
Ω
CH2 100mV M2.00
µ
s A CH3 12.4V 0
04906-017
CH3 10.0V –40 15 70 125 T 0.00000s AMBIENT TEMPERATURE (
°
C)
Figure 17. Switch Leakage Current vs. Ambient Temperature Figure 20. Switching Waveform in Continuous Conduction
1.2 VIN = 3.5V 1.0 ) VIH OLD (V 0.8 3 H S VIL CH1 = I V L 500mA/DIV IN = 5V, VOUT = 20V, CH2 = OUTPUT RIPPLE 100mV/DIV ILOAD = 20mA, FSW = 700kHz, 0.6 CH3 = S L = 10
µ
H, C W 10V/DIV OUT = 10
µ
F 0.4 HUTDOWN THRE 1 S 0.2 2 0
04906-018 04906-021
–40 15 70 125 CH1 10.0mV
Ω
CH2 100mV M2.00
µ
s A CH3 12.2V AMBIENT TEMPERATURE (
°
C) CH3 10.0V
Figure 18. Shutdown Threshold vs. Ambient Temperature Figure 21. Switching Waveform in Discontinuous Conduction Rev. 0 | Page 8 of 20 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CURRENT-MODE PWM OPERATION FREQUENCY SELECTION SOFT START ON/OFF CONTROL SETTING THE OUTPUT VOLTAGE INDUCTOR SELECTION CHOOSING THE INPUT AND OUTPUT CAPACITORS DIODE SELECTION LOOP COMPENSATION SOFT-START CAPACITOR APPLICATION CIRCUITS STEP-UP DC-TO-DC CONVERTER WITH TRUE SHUTDOWN TFT LCD BIAS SUPPLY SEPIC POWER SUPPLY LAYOUT PROCEDURE OUTLINE DIMENSIONS ORDERING GUIDE