Datasheet ADP5023 (Analog Devices) - 10

ADP5023 Data Sheet 100 3.3 90 3.2 80 3.1 70 ) ) % Hz 3.0 ( 60 (M Y C Y N 50 2.9 NC IE UE 40 Q FFIC E 2.8 E R 30 F 2.7 20 2.6 TA = +25°C 10 +25°C +85°C TA = –40°C –40°C T 0 2.5 A = +85°C
2
0.001 0.01 0.1 1
06
0 0.2 0.4 0.6 0.8 1.0 1.2
-040
I
889
OUT (A) IOUT (A)
09889- 09 Figure 15. BUCK1 Efficiency vs. Load Current, Across Temperature, Figure 18. BUCK2 Switching Frequency vs. Output Current, Across VIN = 3.9 V, VOUT1 = 3.3 V, Auto Mode Temperature, VOUT2 = 1.8 V, PWM Mode
100 T 90 VOUT 80 1 70 ) ISW (% 60 Y C N 50 2 IE C 40 FFI SW E 30 20 +85°C 10 +25°C 4 –40°C 0
3
CH1 50.0mV CH2 500mA Ω M 4.00µs A CH2 240mA
5
0.001 0.01 0.1 1
06 02
CH4 2.00V
9-
IOUT (A) T 28.40%
09889- 0988 Figure 16. BUCK2 Efficiency vs. Load Current, Across Temperature, Figure 19. Typical Waveforms, VOUT1 = 3.3 V, IOUT1 = 30 mA, Auto Mode VOUT2 = 1.8 V, Auto Mode
100 T 90 VOUT 80 1 70 ) % ( 60 I Y SW C N 50 2 IE 40 FFIC E 30 SW 20 +85°C 10 +25°C 4 –40°C 0 CH1 50.0mV CH2 500mA Ω M 4.00µs A CH2 220mA
4
0.001 0.01 0.1 1
02 -200
CH4 2.00V
9-
IOUT (A) T 28.40%
09889 0988 Figure 17. BUCK1 Efficiency vs. Load Current, Across Temperature, Figure 20. Typical Waveforms, VOUT2 = 1.8 V, IOUT2 = 30 mA, Auto Mode VOUT1 = 0.8 V, Auto Mode Rev. F | Page 10 of 28 Document Outline Features Applications General Description Typical Application Circuit Table of Contents Revision History Specifications General Specifications BUCK1 and BUCK2 Specifications LDO Specifications Input and Output Capacitor, Recommended Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Power Management Unit Thermal Protection Undervoltage Lockout Enable/Shutdown BUCK1 and BUCK2 Control Scheme PWM Mode Power Save Mode (PSM) PSM Current Threshold Oscillator/Phasing of Inductor Switching Short-Circuit Protection Soft Start Current Limit 100% Duty Operation Active Pull-Downs LDO Applications Information Buck External Component Selection Feedback Resistors Inductor Output Capacitor Input Capacitor LDO External Component Selection Feedback Resistors Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties Power Dissipation and Thermal Considerations Buck Regulator Power Dissipation LDO Regulator Power Dissipation Junction Temperature PCB Layout Guidelines Typical Application Schematics Bill of Materials Outline Dimensions Ordering Guide