LT1579CS datasheet(11/20 Pages) LINER

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LT1579

PIN FUNCTIONS

LBO1: This is the open collector output of the low-battery

comparator LB1. This output pulls low when the com-

parator input drops below the threshold voltage. The

LBO1 output voltage is 1V when sinking 5mA, dropping

to under 200mV at 20

µA (see curve of Logic Flag Voltage

vs Current in the Typical Performance Characteristics).

This makes the LBO1 pin equally useful in driving both

bipolar and CMOS logic inputs with the addition of an

external pull-up resistor. It is also capable of driving

higher current devices, such as LEDs. This pin is inter-

nally clamped to 7V and – 0.6V (one VBE). If unused, this

pin can be left open circuit. Device operation is unaffected

if this pin is not connected.

LBO2: This is the open collector output of the low-battery

comparator LB2. This output pulls low when the com-

parator input drops below the threshold voltage. The

LBO2 output voltage is 1V when sinking 5mA, dropping

to under 200mV at 20

µA (see curve of Logic Flag Voltage

vs Current in the Typical Performance Characteristics).

This makes the LBO2 pin equally useful in driving both

bipolar and CMOS logic inputs with the addition of an

external pull-up resistor. It is also capable of driving

higher current

devices, such as LEDs. This pin is

internally clamped to 7V and – 0.6V (one VBE). If unused,

this pin can be left open circuit. Device operation is

unaffected if this pin is not connected.

BLOCK DIAGRAM

–

LB1

–

LB2

1.5V REFERENCE

BIAS CURRENT

CONTROL

DROPOUT

DETECT

VIN1

VIN2

SHDN

BIASCOMP

LBI1

LBI2

VOUT

ADJ

BACKUP

DROPOUT

LBO1

LBO2

OUTPUT DRIVER

CONTROL

WARNING

FLAGS

1579 • BD

E/A

INTERNAL

RESISTOR DIVIDER

FOR FIXED VOLTAGE

DEVICES ONLY

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