Datasheet ADP1828 (Analog Devices) - 10

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ADP1828 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 95 90 300kHz 90 600kHz 80 85 VIN = 12V fSW = 600kHz V 80 V %) OUT = 1.8V 70 IN = 12V ( T %) A = 25°C ( VOUT = 3.3V 75 T NCY NCY A = 25°C E 60 E ICI 70 ICI F F F F E E 50 65 60 40 55 30 50 0 2 4 6 8 10 12 14 16 18 20
002
0 1 2 3 4 5
007
LOAD (A)
06865-
LOAD (A)
06865- Figure 5. Efficiency vs. Load Current of Figure 1 Figure 8. Efficiency vs. Load Current of Figure 55
95 95 90 90 85 85 VIN = 3.3V V V IN = 5.5V 80 IN = 12V fSW = 300kHz %) 80 %) V ( ( 75 IN = 12V V f V IN = 15V SW = 300kHz OUT = 1.8V NCY 75 NCY T E VOUT = 1.8V 70 E A = 25°C ICI TA = 25°C ICI F F 65 F 70 F E E 60 65 55 60 50 55 45
008
0 5 10 15 20 25
005
0 5 10 15 20 25 30 LOAD (A) LOAD (A)
06865- 06865- Figure 6. Efficiency vs. Load Current of Figure 1 Figure 9. Efficiency vs. Load Current of Figure 57
95 5.5 T 90 A = 25°C 5.0 85 fSW = 600kHz %) 80 ( VIN = 3.3V (V) T 4.5 VOUT = 1.2V NCY PU 75 E TA = 25°C T U ICI F O F 70 4.0 E EG VR 65 3.5 60 55 0 1 2 3 4 5
006
3.0
009
3.0 3.5 4.0 4.5 5.0 5.5 LOAD (A)
06865-
VIN (V)
06865- Figure 7. Efficiency vs. Load Current of Figure 54 Figure 10. VREG in Dropout, No Load Rev. E | Page 10 of 33 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION SIMPLIFIED BLOCK DIAGRAM PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION INPUT POWER INTERNAL LINEAR REGULATOR SOFT START ERROR AMPLIFIER CURRENT-LIMIT SCHEME MOSFET DRIVERS SETTING THE OUTPUT VOLTAGE SWITCHING FREQUENCY CONTROL AND SYNCHRONIZATION COMPENSATION POWER-GOOD INDICATOR THERMAL SHUTDOWN SHUTDOWN CONTROL TRACKING APPLICATION INFORMATION SELECTING THE INPUT CAPACITOR OUTPUT LC FILTER SELECTING THE MOSFETS SETTING THE CURRENT LIMIT ACCURATE CURRENT-LIMIT SENSING FEEDBACK VOLTAGE DIVIDER COMPENSATING THE VOLTAGE MODE BUCK REGULATOR Type II Compensator Type III Compensator SOFT START SWITCHING NOISE AND OVERSHOOT REDUCTION VOLTAGE TRACKING COINCIDENT TRACKING RATIOMETRIC TRACKING THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINE RECOMMENDED COMPONENT MANUFACTURERS APPLICATION CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE