LTC3250-1 데이터 시트보기 (PDF) - Linear Technology

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LTC3250-1

High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

Linear Technology 

LTC3250-1.5/LTC3250-1.2

PI FU CTIO S

VIN (Pin 1): Input Supply Voltage. Bypass VIN with a ≥1µF

low ESR ceramic capacitor.

GND (Pin 2): Ground. Connect to a ground plane for best

performance.

SHDN (Pin 3): Active Low Shutdown Input. A low voltage

on SHDN disables the LTC3250-1.5/LTC3250-1.2. SHDN

must not be allowed to float.

C– (Pin 4): Flying Capacitor Negative Terminal

VOUT (Pin 5): Regulated Output Voltage. VOUT is discon-

nected from VIN during shutdown. Bypass VOUT with a

≥4.7µF low ESR ceramic capacitor (2.5µF min, ESR

< 100mΩ).

C+ (Pin 6): Flying Capacitor Positive Terminal.

BLOCK DIAGRA

SHDN 3

THERMAL

SHUTDOWN

(>160°C)

VIN 1

BURST

DETECT

CIRCUIT

LTC3250-1.5/

LTC3250-1.2

SWITCH

CONTROL

AND

SOFT-START

1.5MHz

OSCILLATOR

CHARGE

PUMP

6 C+

5 VOUT

4 C–

VREF

2

GND

3250 BD

3250fa

5

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