Datasheet ADP3051 (Analog Devices) - 7

ADP3051 CH1 = VIN, CH2 = SW, CH3 = VOUT, CH4 = IL (1A/DIV) CH1 = COMP, CH3 = VOUT, CH4 = ILOAD (50mA TO 490mA) VIN = 3.6V, VOUT = 1.2V, ILOAD = 500mA VIN = 3.6V, VOUT = 2.5V, COUT = 22
µ
F, CC = 150pF, RC = 100k
Ω 04768-0-008 04768-0-011 Figure 9. Start-Up Behavior Figure 12. Load Transient Response
CH2 = I CH1 = V L (100mA/DIV), CH4 = SW IN, CH2 = VOUT V V IN = 3.6V, VOUT = 2.5V, L = 22
µ
H, IOUT = 50mA IN = 3V TO 4V, VOUT = 2.5V, ILOAD = 500mA
04768-0-009 04768-0-012 Figure 10. Light Load Switching Waveforms Figure 13. Line Transient Response
210 200 190 PMOS 180 ) 170
Ω
(m V 160 OUT = 2.5V ON IOUT = 500mA DSR 150 NMOS 140 130 120 110 CH2 = I 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 L (500mA/DIV), CH4 = SW VIN = 3.6V, VOUT = 2.5V, L = 22
µ
H, IOUT = 500mA
04768-0-010
SUPPLY VOLTAGE (V)
04768-0-013 Figure 11. Heavy Load Switching Waveforms Figure 14. Switch On Resistance vs. Input Voltage Rev. 0 | Page 7 of 16 Document Outline FEATURES APPLICATIONS GENERAL DESCRIP TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION PWM CONTROL MODE TRI-MODE OPERATION 100% DUTY CYCLE OPERATION SHUTDOWN UNDERVOLTAGE LOCKOUT (UVLO) SHORT-CIRCUIT PROTECTION AND RECOVERY APPLICATIONS RECOMMENDED COMPONENTS DESIGN PROCEDURE Setting the Output Voltage Inductor Selection OUTPUT CAPACITOR SELECTION Input Capacitor Selection Compensation Design CIRCUIT BOARD LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE