LT1300CS8 datasheet(4/8 Pages) LINER

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LT1300

PIN FUNCTIONS

GND (Pin 1): Signal Ground.

Sel (Pin 2): Output Select. When tied to VIN or VOUT

converter regulates at 5V. When grounded converter

regulates at 3.3V.

SHDN (Pin 3): Shutdown. Pull high to effect shutdown. Tie

to ground for normal operation.

Sense (Pin 4): “Output” Pin.

ILIM (Pin 5): Float for 1A switch current limit. Tie to ground

for approximately 400mA. A resistor between ILIM and

ground sets peak current to some intermediate value (see

Figure 5).

VIN (Pin 6): Supply Pin. Must be bypassed with a large

value electrolytic to ground. A 0.1

µF ceramic capacitor

close to the pin may be needed in some cases.

SW (Pin 7): Switch Pin. Connect inductor and diode here.

Keep layout short and direct to minimize electronic radia-

tion.

PGND (Pin 8): Power Ground. Tie to signal ground (pin 1)

under the package. Bypass capacitor from VIN should be

tied directly to the pin.

Figure 1.

BLOCK DIAGRAM

OSCILLATOR

155kHZ

730

Ω

160x

18mV

OFF

VIN

ILIM

PGND

VOUT

ENABLE

COMPARATOR

–

1.25V

REFERENCE

SENSE

A2 CURRENT

COMPARATOR

A3 DRIVER

BIAS

8.5k

SHUTDOWN

SELECT

GND

161k

144k

500k

LT1300 F1

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