ADP2138CB-2.8EVALZ datasheet(10/20 Pages) AD

Part #	ADP2138CB-2.8EVALZ

Description	Compact, 800 mA, 3 MHz, Step-Down DC-to-DC Converter

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Manufacturer	AD [Analog Devices]

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10 / 20 page

ADP2138/ADP2139

Data Sheet

Rev. C | Page 10 of 20

CH1

1.00V Ω

CH4 5.00V

CH2 500mA Ω

M 40.0µs

A CH3

2.50V

T 10.40%

CH3 5.00V

T

4

1

3

2

SW

VOUT

IIN

EN

Figure 27. Startup, VOUT = 0.8 V, IOUT = 10 mA

CH1

5.00V Ω

CH4 5.00V

CH2 500mA Ω

M 40.0µs

A CH3

2.50V

T 10.40%

CH3 5.00V

T

4

1

3

2

SW

VOUT

IIN

EN

Figure 28. Startup, VOUT = 3.3 V, IOUT = 10 mA

T

4

1

2

A CH1

3.80mV

M 1.00µs

T 50.00%

CH1 10.0mV

Ω

CH4 2.00V

CH2

500mA Ω

SW

VOUT

IL

Figure 29. Typical Waveform, VOUT = 1.8 V, PSM Mode, IOUT = 10 mA

T

4

1

2

A CH4

1.32V

M 40.0µs

T 50.00%

CH1 10.0mV

Ω

CH2 500mA

Ω

CH4 2.00V

SW

VOUT

IL

Figure 30. Typical Waveform, VOUT = 1.8 V, PWM Mode, IOUT = 200 mA

CH1 100mV

CH4 2.00V

M 40.0µs

A CH3

1.36V

T 29.60%

CH3 2.00V

T

4

1

3

SW

MODE

VOUT

Figure 31. Mode Transition from PSM to PWM to PSM, VOUT = 1.8 V

130

120

100

110

90

80

70

60

50

40

30

20

10

0

0.001

0.01

0.1

1

IOUT (A)

1.8V, VIN = 5.5V, AUTO

1.8V, VIN = 3.6V, AUTO

1.8V, VIN = 2.3V, AUTO

1.8V, VIN = 5.5V, PWM

1.8V, VIN = 3.6V, PWM

1.8V, VIN = 2.3V, PWM

Figure 32. VOUT Peak-to-Peak Ripple vs. Output Current, VOUT = 1.8 V

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ADP2138CB-2.8EVALZ Datasheet(PDF) 10 Page - Analog Devices

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