Datasheet ADP5135 (Analog Devices) - 8

ADP5135 Data Sheet 1.204 100 VIN3 = 3.0V VIN3 = 3.6V 90 1.202 VIN3 = 4.2V VIN3 = 5.5V 80 1.200 70 ) % ( 60 1.198 Y (V) C 3 T N 50 IE OUV 1.196 FFIC 40 E 1.194 30 20 VIN2 = 3.0V 1.192 VIN2 = 3.6V 10 VIN2 = 4.2V VIN2 = 5.5V 1.190 0
2
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
009
0.001 0.01 0.1 1 10
01 4-
IOUT3 (A) LOAD CURRENT (A)
604- 1260 12 Figure 9. BUCK3 Load Regulation Across Input Voltage, Figure 12. BUCK2 Efficiency vs. Load Current, Across Input Voltage, VOUT3 = 1.2 V, PWM Mode VOUT2 = 1.8 V, Auto Mode
100 100 90 90 80 80 70 70 ) ) % ( 60 % Y ( 60 C Y N C 50 N IE 50 IE FFIC 40 40 E FFIC E 30 30 20 20 VIN2 = 3.0V VIN1 = 3.9V VIN2 = 3.6V 10 VIN1 = 4.2V 10 VIN2 = 4.2V VIN1 = 5.5V VIN2 = 5.5V 0
0
0 0.001 0.01 0.1 1 10
3 01
0.001 0.01 0.1 1 10
01
LOAD CURRENT (A)
604-
LOAD CURRENT (A)
604- 12 12 Figure 10. BUCK1 Efficiency vs. Load Current, Across Input Voltage, Figure 13. BUCK2 Efficiency vs. Load Current, Across Input Voltage, VOUT1 = 3.3 V, Auto Mode VOUT2 = 1.8 V, PWM Mode
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 20 VIN3 = 3.0V VIN1 = 3.9V VIN3 = 3.6V 10 VIN1 = 4.2V 10 VIN3 = 4.2V VIN1 = 5.5V VIN3 = 5.5V 0 0
1 4
0.001 0.01 0.1 1 10
1 0
0.001 0.01 0.1 1 10
01 04-
LOAD CURRENT (A) LOAD CURRENT (A)
604- 126 12 Figure 11. BUCK1 Efficiency vs. Load Current, Across Input Voltage, Figure 14. BUCK3 Efficiency vs. Load Current, Across Input Voltage, VOUT1 = 3.3 V, PWM Mode VOUT3 = 1.2 V, Auto Mode Rev. 0 | Page 8 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