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LT1301

PIN FUNCTIONS

GND (Pin 1): Signal Ground. Tie to PGND under the

package.

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

regulates at 12V. When grounded or floating converter

regulates at 5V. May be driven under logic control.

SHDN (Pin 3): Shutdown. Pull high to shut down the

LT1301. Ground for normal operation.

Sense (Pin 4): “Output” Pin. Goes to internal resistive

divider. If operating at 5V output, a 0.1

µF ceramic capaci-

tor is required from Sense to Ground.

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 .

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

value electrolytic to ground. Keep bypass within 0.2" of the

device.

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

Keep layout short and direct to minimize radio frequency

interference.

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

under the package. Bypass capacitor from VIN should be

tied directly to PGND within 0.2" of the device.

Figure 2.

BLOCK DIAGRAM

OSCILLATOR

155kHZ

730

Ω

160

18mV

OFF

VIN

ILIM

PGND

VOUT

ENABLE

COMPARATOR

–

1.25V

REFERENCE

SENSE

A2 CURRENT

COMPARATOR

A3 DRIVER

BIAS

8.5k

SHUTDOWN

SELECT

GND

69.2k

97.5k

500k

LT1301 F2

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