Datasheet ADP5135 (Analog Devices) - 9

Data Sheet ADP5135 100 100 90 90 80 80 70 70 ) ) % % ( 60 ( 60 Y Y C C N 50 N 50 IE IE FFIC 40 FFIC 40 E E 30 30 20 VIN3 = 3.0V 20 VIN3 = 3.6V TA = +85°C 10 VIN3 = 4.2V 10 TA = +25°C VIN3 = 5.5V TA = –40°C 0 0
5 8
0.001 0.01 0.1 1 10
01
0.001 0.01 0.1 1 10
01
LOAD CURRENT (A)
604-
LOAD CURRENT (A)
604- 12 12 Figure 15. BUCK3 Efficiency vs. Load Current, Across Input Voltage, Figure 18. BUCK3 Efficiency vs. Load Current, Across Temperature, VOUT3 = 1.2 V, PWM Mode VOUT3 = 1.2 V, Auto Mode
100 3.5 90 3.4 80 ) 3.3 Hz 70 (M 3.2 ) % ( 60 NCY 3.1 Y C UE N Q 50 3.0 IE RE F FFIC 40 2.9 E ING 30 CH 2.8 IT 20 W S 2.7 TA = +85°C TA = +85°C 10 TA = +25°C 2.6 TA = +25°C TA = –40°C TA = –40°C 0 2.5
6 9
0.001 0.01 0.1 1 10
01
0 200 400 600 800 1000 1200 1400 1600 1800
01
LOAD CURRENT (A)
604-
LOAD CURRENT (mA)
604- 12 12 Figure 16. BUCK1 Efficiency vs. Load Current, Across Temperature, Figure 19. BUCK2 Switching Frequency vs. Load Current, Across Temperature, VOUT1 = 3.3 V, Auto Mode VOUT2 = 1.8 V, PWM Mode
100 T 90 VOUT1 80 1 70 ) % ( 60 Y I C SW1 N 50 3 IE FFIC 40 E 30 VSW1 20 2 TA = +85°C 10 TA = +25°C TA = –40°C 0
7
0.001 0.01 0.1 1 10
-020 01
CH1 20mV CH2 2.0V M8.0µs A CH2 2.20V LOAD CURRENT (A) CH3 500mA
604-
T 10.20%
12604 12 Figure 17. BUCK2 Efficiency vs. Load Current, Across Temperature, Figure 20. Typical Waveforms, VOUT1 = 3.3 V, Load Current = 50 mA, V Auto Mode OUT2 = 1.8 V, Auto Mode Rev. 0 | Page 9 of 24 Document Outline Features Applications Typical Application Circuit General Description Revision History Specifications BUCK1, BUCK2, and BUCK3 Input and Output Capacitors, Recommended Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Power Management Unit Power-Good Output Thermal Protection Undervoltage Lockout Precision Enable and Shutdown Control Buck Regulators: BUCK1, BUCK2, AND BUCK3 Control Scheme PWM Mode Power Save Mode (PSM) PSM Current Threshold Oscillator/Phasing of Inductor Switching Short-Circuit Protection Buck Regulator Soft Start Current Limit 100% Duty Operation Active Pull-Down Resistors Applications Information Buck External Component Selection Feedback Resistors Inductor Output Capacitor Input Capacitor Typical Application Schematics Power Dissipation and Thermal Considerations Buck Regulator Power Dissipation Junction Temperature PCB Layout Guidelines Outline Dimensions Ordering Guide