Datasheet ADP2138, ADP2139 (Analog Devices) - 10

ADP2138/ADP2139 Data Sheet T T SW SW 4 IIN 4 2 IL VOUT 2 VOUT 1 EN 1 1 3 CH1 1.00V Ω CH2 500mA Ω M 40.0µs A CH3 2.50V
023
CH1 10.0mVΩ CH2 500mA Ω M 40.0µs A CH4 1.32V
026
CH3 5.00V CH4 5.00V CH4 2.00V T 10.40%
09496-
T 50.00%
09496- Figure 27. Startup, VOUT = 0.8 V, IOUT = 10 mA Figure 30. Typical Waveform, VOUT = 1.8 V, PWM Mode, IOUT = 200 mA
T T SW VOUT 1 4 IIN MODE 2 1 3 SW VOUT 1 EN 1 3 4 CH1 5.00V Ω CH2 500mA Ω M 40.0µs A CH3 2.50V
024
CH1 100mV M 40.0µs A CH3 1.36V
035
CH3 5.00V CH4 5.00V CH3 2.00V CH4 2.00V T 10.40%
09496-
T 29.60%
09496- Figure 28. Startup, VOUT = 3.3 V, IOUT = 10 mA Figure 31. Mode Transition from PSM to PWM to PSM, VOUT = 1.8 V
130 T 1.8V, V SW IN = 5.5V, AUTO 120 1.8V, VIN = 3.6V, AUTO 110 1.8V, VIN = 2.3V, AUTO 1.8V, V 100 IN = 5.5V, PWM 1.8V, VIN = 3.6V, PWM 90 1.8V, VIN = 2.3V, PWM 4 V) 80 IL E (m 70 IPPL 60 R 2 UT 50 OV 40 VOUT 30 1 20 10 0 CH1 10.0mVΩ CH2 500mA Ω M 1.00µs A CH1 3.80mV
025
0.001 0.01 0.1 1
100
CH4 2.00V T 50.00% I
09496-
OUT (A)
09496- Figure 29. Typical Waveform, VOUT = 1.8 V, PSM Mode, IOUT = 10 mA Figure 32. VOUT Peak-to-Peak Ripple vs. Output Current, VOUT = 1.8 V Rev. C | Page 10 of 20 Document Outline Features Applications General Description Typical Applications Circuit Revision History Table of Contents 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 Control Scheme PWM Mode Power Save Mode Power Save Mode Current Threshold Enable/Shutdown Short-Circuit Protection Undervoltage Lockout Thermal Protection Soft Start Current Limit 100% Duty Operation Discharge Switch Applications Information ADIsimPower Design Tool External Component Selection Inductor Thermal Considerations PCB Layout Guidelines Evaluation Board Evaluation Board Layout Outline Dimensions Ordering Guide