4

LTC1514-3.3/LTC1514-5

LTC1514-5 Step-Up Mode

Load Transient Response

LTC1514-5 Step-Down Mode

Load Transient Response

50mA

0mA

AC COUPLED

100mV/DIV

50mA/DIV

1514 G10

AC COUPLED

100mV/DIV

50mA/DIV

1514 G11

–

+

–

+

650kHz

OSCILLATOR

1.145V

STEP-UP/STEP-DOWN

CHARGE PUMP

LBI

1514 BD

SHDN

LBO

GND

SHDN (Pin 1): Shutdown Input. A logic low on the SHDN

pin puts the part into shutdown mode. A logic high

unused.

LBO (Pin 2): Open-Drain, Low-Battery Comparator Out-

put. This pin will pull low whenever the voltage on the LBI

pin is less than the internal reference voltage (1.145V typ).

LBI (Pin 3): Low-Battery Comparator Input. The voltage

on this pin is compared to the internal reference voltage

(1.145V). The LBO output will sink current when the

voltage on the LBI pin is less than 1.145V typ. The low-