LT1934IS6 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LT1934IS6

Micropower Step-Down Switching Regulators in ThinSOT and DFN

Linear Technology 

TYPICAL PERFORMANCE CHARACTERISTICS

LT1934/LT1934-1

Quiescent Current

vs Temperature

20

Undervoltage Lockout

vs Temperature

4.0

15

3.5

10

3.0

5

2.5

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1934 G10

Minimum Input Voltage

VOUT = 3.3V

6.0

LT1934

VOUT = 3.3V

5.5 TA = 25°C

BOOST DIODE TIED TO OUTPUT

5.0

VIN TO START

4.5

4.0

VIN TO RUN

3.5

3.0

0.1

1

10

100

LOAD CURRENT (mA)

1934 G12

2.0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1934 G11

Minimum Input Voltage

VOUT = 5V

8

LT1934

VOUT = 5V

TA = 25°C

7 BOOST DIODE TIED TO OUTPUT

VIN TO START

6

VIN TO RUN

5

4

0.1

1

10

100

LOAD CURRENT (mA)

1934 G13

PIN FUNCTIONS (TSOT-23/DFN)

BOOST (Pin 1/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/Pin 5): Tie the GND pin to a local ground plane

below the LT1934 and the circuit components. Return the

feedback divider to this pin.

FB (Pin 3/Pin 6): The LT1934 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) or R1 = R2 (VOUT/1.25 – 1).

SHDN (Pin 4/Pin 4): The SHDN pin is used to put the LT1934

in shutdown mode. Tie to ground to shut down the LT1934.

Apply 2.3V or more for normal operation. If the shutdown

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

VIN (Pin 5/Pin 3): The VIN pin supplies current to the

LT1934’s internal regulator and to the internal power

switch. This pin must be locally bypassed.

SW (Pin 6/Pin 2): The SW pin is the output of the internal

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

and boost capacitor.

Exposed Pad (Pin 7, DFN Package): This pin must be

soldered to ground plane.

1934fe

5

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