LT1616 데이터 시트보기 (PDF) - Linear Technology

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LT1616

600mA, 1.4MHz Step-Down Switching Regulator in SOT-23

Linear Technology 

LT1616

TYPICAL PERFOR A CE CHARACTERISTICS

Oscillator Frequency

2.00

1.75

1.50

1.25

1.00

0.75

0.50

0.25

0

–50 –25 0 25 50 75 100

TEMPERATURE (°C)

1616 G09

SHDN Pin Current

120

100

80

60

40

20

0

0

5

10

15

20

25

SHDN PIN VOLTAGE

1616 G10

PI FU CTIO S

BOOST (Pin 1): The BOOST pin is used to provide a drive

voltage, higher than the input voltage, to the internal

bipolar NPN power switch.

GND (Pin 2): Tie the GND pin to a local ground plane below

the LT1616 and the circuit components. Return the feed-

back divider to this pin.

FB (Pin 3): The LT1616 regulates its feedback pin to 1.25V.

Connect the feedback resistor divider tap to this pin. Set

the output voltage according to VOUT = 1.25V (1 + R1/R2).

A good value for R2 is 10k.

SHDN (Pin 4): The SHDN pin is used to put the LT1616 in

shutdown mode. Tie to ground to shut down the LT1616.

Tie to 2V or more for normal operation. If the shutdown

feature is not used, tie this pin to the VIN pin.

VIN (Pin 5): The VIN pin supplies current to the LT1616’s

internal regulator and to the internal power switch. This pin

must be locally bypassed.

SW (Pin 6): The SW pin is the output of the internal power

switch. Connect this pin to the inductor, catch diode and

boost capacitor.

4

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