Datasheet ADP2102 (Analog Devices) - 7

Data Sheet ADP2102 100 1.53 TA = 25°C T C A = 25°C FF = 6.8pF 1.52 95 V ) IN = 4.5V V ( PSM %) ( GE V 1.51 IN = 5.0V NCY 90 E V OLTA IN = 5.5V ICI T V F U 1.50 F E TP OU CCM 85 1.49 MODE = PSM 80 1.48
050
1 10 100 1000
013
0 100 200 300 400 500 600 LOAD CURRENT (mA) LOAD CURRENT (mA)
06631- 06631- Figure 10. Efficiency vs. Load Current (VOUT = 3.3 V) Figure 13. Output Voltage vs. Load Current (VOUT = 1.5 V)
95 1.84 TA = 25°C TA = 25°C 90 PSM 1.83 85 ) V 80 ( 1.82 %) ( GE PSM 75 NCY E OLTA 1.81 70 ICI T V F CCM F U E CCM 65 TP 1.80 OU 60 1.79 55 50 1.78 10 100 1k
026 017
0 100 200 300 400 500 600 LOAD CURRENT (mA) LOAD CURRENT (mA)
06631- 06631- Figure 11. PSM vs. CCM Efficiency (VOUT = 1.8 V) Figure 14. Output Voltage vs. Load Current (VOUT = 1.8 V)
1.22 1.23 TA = 25°C 1.22 ILOAD = 0mA 1.21 ) ) V V ( PSM ( ILOAD = 300mA GE GE 1.21 OLTA 1.20 OLTA CCM ILOAD = 600mA T V T V U U 1.20 TP TP OU OU 1.19 1.19
1
1.18
1
1.18
046 0
0 100 200 300 400 500 600 –45 –25 –5 15 35 55 75 LOAD CURRENT (mA) TEMPERATURE (°C)
06631- 06631- Figure 12. Output Voltage vs. Load Current (VOUT = 1.2 V) Figure 15. Output Voltage vs. Temperature (VOUT = 1.2 V) Rev. C | Page 7 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE BOUNDARY CONDITION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL SCHEME CONSTANT ON-TIME TIMER FORCED CONTINUOUS CONDUCTION MODE POWER SAVE MODE SYNCHRONOUS RECTIFICATION CURRENT LIMIT SOFT START ENABLE UNDERVOLTAGE LOCKOUT THERMAL SHUTDOWN APPLICATIONS INFORMATION INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION TYPICAL APPLICATION CIRCUITS SETTING THE OUTPUT VOLTAGE EFFICIENCY CONSIDERATIONS Power Switch Conduction Losses Inductor Losses Switching Losses Transition Losses THERMAL CONSIDERATIONS DESIGN EXAMPLE Inductor Output Capacitor Input Capacitor Losses CIRCUIT BOARD LAYOUT RECOMMENDATIONS RECOMMENDED LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE