Datasheet ADP2140 (Analog Devices) - 7

Data Sheet ADP2140 TYPICAL PERFORMANCE CHARACTERISTICS BUCK OUTPUT
VIN1 = 4 V, VOUT = 1.8 V, IOUT = 10 mA, CIN = COUT = 10 µF, TA = 25°C, unless otherwise noted.
30 1.82 25 1.81 A) µ ) ( V 20 ( 1.80 NT GE 15 CURRE OLTA 1.79 NT T V U CE S 10 TP 1.78 E LOAD CURRENT = 1mA UI OU LOAD CURRENT = 10mA Q –40°C –5°C LOAD CURRENT = 50mA 5 1.77 +25°C LOAD CURRENT = 100mA +85°C LOAD CURRENT = 300mA +125°C LOAD CURRENT = 600mA 0 1.76 2.3 2.8 3.3 3.8 4.3 4.8 5.3
004
–40 –5 25 85 125
007
INPUT VOLTAGE (V) JUNCTION TEMPERATURE (°C)
07932- 07932- Figure 4. Quiescent Supply Current vs. Input Voltage, Different Temperatures Figure 7. Output Voltage vs. Temperature, VIN1 = 2.3 V, Different Loads
3.1 1200 2.3V 3.0V 1150 4.0V 3.0 5.0V 1100 5.5V 1050 z) 2.9 mA) ( 1000 IT Y (MH C IM 2.8 L 950 EN U NT 900 EQ R 2.7 F CURRE 850 +25°C 800 2.6 –40°C –5°C +85°C 750 +125°C 2.5 700 2.3 2.8 3.3 3.8 4.3 4.8 5.3
005
–60 –40 –20 0 20 40 60 80 100 120 140
008
INPUT VOLTAGE (V) JUNCTION TEMPERATURE (°C)
07932- 07932- Figure 5. Switching Frequency vs. Input Voltage, Different Temperatures Figure 8. Current Limit vs. Temperature, Different Input Voltages
3.10 140 5.5V 3.05 4.6V 3.1V 120 3.00 2.3V 2.95 100 z) 2.90 mA) Y (MH 80 ( C 2.85 NT EN U 60 2.80 EQ R CURRE F 2.75 40 –40°C 2.70 –5°C 20 +25°C 2.65 +85°C +125°C 2.60 0 –60 –40 –20 0 20 40 60 80 100 120 140
006
3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50
009
TEMPERATURE (°C) INPUT VOLTAGE (V)
07932- 07932- Figure 6. Switching Frequency vs. Temperature, Different Input Voltages Figure 9. PSM to PWM Mode Transition vs. Input Voltage, Different Temperatures Rev. A | Page 7 of 32 Document Outline Features Applications General Description Typical Application Circuits Revision History Specifications Recommended Specifications: Capacitors and Inductor Pin Configuration and Function Descriptions Typical Performance Characteristics Buck Output LDO Output Theory of Operation Buck Section Control Scheme PWM Operation PSM Operation Pulse Skipping Threshold Selected Features Short-Circuit Protection Undervoltage Lockout Thermal Protection Soft Start Current Limit Power-Good Pin LDO Section Applications Information Power Sequencing Power-Good Function External Component Selection Selecting the Inductor Output Capacitor Input Capacitor Efficiency Power Switch Conduction Losses Inductor Losses Switching Losses Transition Losses Recommended Buck External Components LDO Capacitor Selection Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties LDO as a Postregulator to Reduce Buck Output Noise Thermal Considerations PCB Layout Considerations Outline Dimensions Ordering Guide