Datasheet ADP3050 (Analog Devices) - 8

ADP3050 Data Sheet 0.8 VIN = 10V ) V 0.7 ( VSW = 5V/DIV GE 0.6 OLTA V 0.5 0V TION A 0.4 R TU IL = 500mA/DIV A 0.3 S H VIN = 10V 0.2 VOUT = 5V WITC S I 0A LOAD = 800mA 0.1 L = 33µH CIN = 22µF COUT = 100µF 0
015
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
018
LOAD CURRENT (A) TIME (1µs/DIV)
00125- 00125- Figure 15. Switch Saturation Voltage vs. Load Current Figure 18. Continuous Conduction Mode Waveforms
210 V 208 IN = 10V ILOAD = 250µA ) 206 VSW = 5V/DIV kHz ( 204 NCY 202 UE 0V Q VIN = 10V 200 RE VOUT = 5V F ILOAD = 100mA 198 NG L = 33µH CIN = 22µF CHI 196 IT C I OUT = 100µF L = 500mA/DIV W S 194 0A 192 190–45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85
016 019
AMBIENT TEMPERATURE (°C) TIME (1µs/DIV)
00125- 00125- Figure 16. Switching Frequency vs. Temperature Figure 19. Discontinuous Conduction Mode Waveforms
250 VIN = 10V COMP = 0.4V ) 200 kHz ( VOUT = 200mV/DIV 5V NCY 150 UE Q RE F I 100 LOAD NG 1A CHI IT VIN = 10V W VOUT = 5V S 50 0A ILOAD = 100mA TO 1A SWITCHED L = 33µH CIN = 22µF 0 COUT = 100µF 0 0.2 0.4 0.6 0.8 1.0
017 020
NORMALIZED FEEDBACK VOLTAGE (V) TIME (400µs/DIV)
00125- 00125- Figure 17. Frequency Foldback Figure 20. Transient Response Rev. C | Page 8 of 20 Document Outline Features Applications Functional Block Diagram General Description Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Setting the Output Voltage Applications Information ADIsimPower Design Tool Inductor Selection Continuous Mode Discontinuous Mode Inductor Core Types and Materials Choosing an Inductor Output Capacitor Selection Choosing an Output Capacitor Catch Diode Selection Choosing a Catch Diode Input Capacitor Selection Discontinous Mode Ringing Setting the Output Voltage Frequency Compensation Current Limit/Frequency Foldback Bias Pin Connection Boosted Drive Stage Start-Up/Minimum Input Voltage Thermal Considerations Board Layout Guidelines Typical Applications 5 V to 3.3 V Buck (Step-Down) Regulator Inverting (Buck Boost) Regulator Dual Output SEPIC Regulator Outline Dimensions Ordering Guide