Datasheet ADP2121 (Analog Devices) - 8

ADP2121 Data Sheet 90 100 250 VOUT = 1.82 V 85 90 T EFFICIENCY A = –40°C 80 200 80 70 ) 75 W %) %) V ( ( 60 IN = 5.0V 150 70 SS (m NCY TA = +25°C NCY 50 V O E E IN = 4.2V L 65 ICI ICI F F 40 100 ER F F VIN = 3.6V W E 60 E T PO A = +85°C 30 55 V 20 IN = 2.7V 50 AUTO MODE 50 V 10 POWER IN = 3.6V V LOSS OUT = 1.82V 45 0 0 0.1 1 10 100 1000
006
0.1 1 10 100 1000
009
LOAD CURRENT (mA) LOAD CURRENT (mA)
07407- 07407- Figure 16. Efficiency vs. Load Current Over Temperature Figure 19. Efficiency and Power Loss vs. Load Current (Auto Mode)
1.87 1.835 V V IN = 2.7V OUT = 1.82V VIN = 5.0V 1.86 VIN = 5.0V 1.830 ) ) V VIN = 4.2V V ( ( GE 1.85 GE OLTA OLTA 1.825 VIN = 3.6V T V T V VIN = 4.2V U 1.84 U TP TP OU V OU IN = 3.6V 1.820 VIN = 2.7V 1.83 AUTO MODE VOUT = 1.82V PWM MODE 1.82 1.815 0.1 1 10 100 1000
005
1 10 100 1000
008
LOAD CURRENT (mA)
07407-
LOAD CURRENT (mA)
07407- Figure 17. Output Voltage Accuracy (Auto Mode) Figure 20. Output Voltage Accuracy (PWM Mode)
360 400 340 350 320 Ω) Ω) 300 (m 300 (m N N O O DS 280 DS R R L T 250 T A = +85°C L A = +85°C 260 T 240 200 A = +25°C CHANNE TA = +25°C -CHANNE N- P 220 T 150 A = –40°C 200 TA = –40°C 180 100 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
015
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
012
INPUT VOLTAGE (V) INPUT VOLTAGE (V)
07407- 07407- Figure 18. N-Channel Drain-Source On Resistance Figure 21. P-Channel Drain-Source On Resistance Rev. C | Page 8 of 20 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL DATA THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION OVERVIEW MODE SELECTION Pulse-Width Modulation (PWM) Mode Auto Mode (PFM and PWM Switching) Pulse Frequency Modulation (PFM) Mode Transition ENABLE/SHUTDOWN INTERNAL CONTROL FEATURES Overcurrent Protection Soft Start Synchronous Rectification Compensation Undervoltage Lockout (UVLO) Output Short-Circuit Protection Thermal Shutdown (TSD) Protection APPLICATIONS INFORMATION INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION PCB LAYOUT GUIDELINES OUTLINE DIMENSIONS ORDERING GUIDE