4

LT1305

TEMPERATURE (

°C)

–50

1.200

1.210

1.215

1.220

1.225

1.230

1.235

–25

0

25

50

LT1305 • G10

75

1.240

1.245

1.250

1.205

100

Low-Battery Detect Trip Point

TEMPERATURE (

°C)

–50

0

50

100

150

200

300

–25

025

50

LT1305 • G13

75

100

250

Switch Saturation Voltage

SWITCH CURRENT (A)

0

300

400

1.6

LT1305 • F12

200

100

250

350

150

50

0

0.4

0.8

1.2

2.0

1.4

0.2

0.6

1.0

1.8

Switch Saturation Voltage

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

package.

LBO (Pin 2): Open-Collector Output of Comparator C3.

Can sink 100

µA. High impedance when device is in shut-

down.

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

LT1305. Ground for normal operation.

FB (Pin 4): Feedback Input. Connects to main comparator

C1 input.

LBI (Pin 5): Low-Battery Comparator Input. When voltage

on this pin is below 1.24V, LBO is low.

value capacitor to gound. 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)

tied directly to PGND within 0.2" of the device.

PI FU CTIO S