SC250 データシートの表示（PDF） - Semtech Corporation

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SC250

Step-Down DC-DC Converter with Bias LDO for RF Power Amplifiers

Semtech Corporation 

POWER MANAGEMENT

Typical Characteristics (Cont.)

Load Step response (VOUT=3.25V)

SC250

PRELIMINARY

Load Step response (VOUT=1.5V)

VOUT (100mV/div)

VOUT (100mV/div)

IOUT(500mA/div)

Time (40μs/div)

Condition VIN=4.2V, Load=600mA-60mA, VOUT=3.25V

Enable Start-Up

VEN (2V/div)

V (1V/div)

OUT

VLX (5V/div)

IIN (500mA/div)

Time (20μs/div)

Condition VIN=4.2V, Load=15Ω, VOUT=3.4V

Output Ripple Waveform (V =1.5V)

OUT

IOUT(500mA/div)

Time (40μs/div)

Condition VIN=3.6V, Load=600mA-60mA, VOUT=1.5V

Output Ripple Waveform (VOUT=3.25V)

VOUT (50mV/div)

VLX(5V/div)

Time (1μs/div)

Condition VIN=4.2V, Load=300mA, VOUT=3.25V

Pass-Through Current Limit

VOUT (50mV/div)

V (5V/div)

LX

VOUT (1V/div)

VLX(2V/div)

Time (1μs/div)

Condition VIN=3.6V, Load=300mA, VOUT=1.5V

Time (1ms/div)

Condition VIN=3.6V, Load=1Ω, VDAC=1.4V

© 2006 Semtech Corp.

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