Datasheet ADP5133 (Analog Devices) - 9

Data Sheet ADP5133 100 3.3 90 3.2 80 ) 3.1 70 Hz (%) (M 3.0 60 ENCY NCY 50 UE 2.9 Q FFICI 40 RE 2.8 30 BUCK1 E 2.7 BUCK2 F 20 2.6 TA = +25°C 10 +25°C +85°C TA = –40°C –40°C T 0 2.5 A = +85°C 0.001 0.01 0.1 1
062
0 0.2 0.4 0.6 0.8 1.0 1.2
040
LOAD CURRENT (A) IOUT (A)
11991- 11991- Figure 15. BUCK1 Efficiency vs. Load Current, Across Temperature, Figure 18. BUCK2 Switching Frequency vs. Output Current, Across VIN1 = 3.9 V, VOUT1 = 3.3 V, Auto PWM/PSM Mode Temperature, VOUT2 = 1.8 V, PWM Mode
100 T 90 VOUT 80 1 70 (%) I 60 SW ENCY 50 2 FFICI 40 SW 30 BUCK2 E 20 +85°C 10 +25°C 4 0 –40°C 0.001 0.01 0.1 1 CH1 50.0mV CH2 500mA M 4.00µs A CH2 240mA
063
CH4 2.00V
-251
LOAD CURRENT (A)
11991-
T 28.40%
11991 Figure 16. BUCK2 Efficiency vs. Load Current, Across Temperature, Figure 19. Typical Waveforms, VOUT1 = 3.3 V, IOUT1 = 30 mA, VOUT2 = 1.8 V, Auto PWM/PSM Mode Auto PWM/PSM Mode
100 T 90 VOUT 80 1 70 (%) 60 I ENCY SW 50 2 FFICI 40 30 SW BUCK1 E 20 +85°C 10 +25°C 4 0 –40°C 0.001 0.01 0.1 1 CH1 50.0mV BW CH2 500mA M 4.00µs A CH2 220mA
200
CH4 2.00V B
-250
W LOAD CURRENT (A) T 28.40%
11991- 11991 Figure 17. BUCK1 Efficiency vs. Load Current, Across Temperature, Figure 20. Typical Waveforms, VOUT2 = 1.8 V, IOUT2 = 30 mA, VOUT1 = 0.8 V, Auto PWM/PSM Mode Auto PWM/PSM Mode Rev. A | Page 9 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS GENERAL SPECIFICATIONS BUCK1 AND BUCK2 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 Auto PSM/PWM Operation PSM Current Threshold Oscillator/Phasing of Inductor Switching Short-Circuit Protection Soft Start Current Limit 100% Duty Operation Active Pull-Downs APPLICATIONS INFORMATION BUCK EXTERNAL COMPONENT SELECTION Feedback Resistors Inductor Output Capacitor Input Capacitor POWER DISSIPATION AND THERMAL CONSIDERATIONS BUCK REGULATOR POWER DISSIPATION JUNCTION TEMPERATURE PCB LAYOUT GUIDELINES TYPICAL APPLICATION SCHEMATICS OUTLINE DIMENSIONS ORDERING GUIDE