Datasheet ADP1829 (Analog Devices) - 9

Data Sheet ADP1829 TYPICAL PERFORMANCE CHARACTERISTICS 95 92 VIN = 5V SWITCHING FREQUENCY = 300kHz VIN = 12V 90 90 88 ) ) (% 85 V (% Y IN = 20V Y 86 C V C IN = 15V IEN IEN IC IC F 84 80 F EF EF SWITCHING FREQUENCY = 600kHz 82 75 80 70 78 0 5 10 15 20
4 7 00
0 5 10 15 20
00 4- 4-
LOAD CURRENT (A)
78
LOAD CURRENT (A)
78 06 06 Figure 4. Efficiency vs. Load Current, VOUT = 1.8 V, 300 kHz Switching Figure 7. Efficiency vs. Load Current, VIN = 12 V, VOUT = 1.8 V
95 4.980 VOUT = 3.3V 90 V 4.975 OUT = 1.8V ) ) (V (% 85 E Y G C A V T OUT = 1.2V L 4.970 IEN IC VO F 80 EF EG R V 4.965 75 70 4.960 0 5 10 15 20
5 8 00
–40 –15 10 35 60 85
00 4- 4-
LOAD CURRENT (A)
78
TEMPERATURE (°C)
78 06 06 Figure 5. Efficiency vs. Load Current, VIN = 12 V, 300 kHz Switching Figure 8. VREG Voltage vs. Temperature
94 4.970 SWITCHING FREQUENCY = 300kHz 4.968 92 4.966 90 4.964 ) 88 (% 4.962 Y ) C (V 86 SWITCHING FREQUENCY = 600kHz 4.960 IEN EG IC F VR 4.958 EF 84 4.956 82 4.954 80 4.952 78 4.950 0 5 10 15 20
6 9 00
5 8 11 14 17 20
00 4- 4-
LOAD CURRENT (A)
78
INPUT VOLTAGE (V)
78 06 06 Figure 6. Efficiency vs. Load Current, VIN = 5 V, VOUT = 1.8 V Figure 9. VREG vs. Input Voltage, 10 mA Load Rev. D | Page 9 of 28 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION FUNCTIONAL BLOCK DIAGRAM PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION INPUT POWER START-UP LOGIC INTERNAL LINEAR REGULATOR OSCILLATOR AND SYNCHRONIZATION ERROR AMPLIFIER SOFT START POWER OK INDICATOR TRACKING MOSFET DRIVERS CURRENT LIMIT APPLICATIONS INFORMATION SELECTING THE INPUT CAPACITOR Selecting the Output LC Filter SELECTING THE MOSFETS SETTING THE CURRENT LIMIT FEEDBACK VOLTAGE DIVIDER COMPENSATING THE VOLTAGE MODE BUCK REGULATOR Type II Compensator Type III Compensator SOFT START VOLTAGE TRACKING COINCIDENT TRACKING RATIOMETRIC TRACKING Setting the Channel 2 Undervoltage Threshold for Ratiometric Tracking THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINES LFCSP PACKAGE CONSIDERATIONS APPLICATION CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE