LTC2927CDDB datasheet(5/16 Pages) LINER

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LTC2927

2927fb

0.8V

–

0.2V

10μA

–

RAMPBUF

RAMP

2927 BD

VCC

GND

SDO

TRACK

1.23V

–

VCC

2.5V

VCC

UVLO

VCC

FU CTIO AL BLOCK DIAGRA

TSOT/DFN Packages

PI FU CTIO S

GND (Pin 4/Pin 5): Device Ground.

TRACK (Pin 5/Pin 4): Tracking Control Input. A resistive

voltage divider between RAMPBUF and TRACK determines

the tracking proﬁle of the slave supply. TRACK servos to

0.8V, and the current supplied at TRACK is mirrored at FB.

The TRACK pin is capable of supplying at least 1mA when

VCC = 2.9V. Under short circuit conditions, the TRACK pin

is capable of supplying up to 70mA. Do not connect to

GND for extended periods. Limit the capacitance at the

TRACK pin to less than 25pF.

RAMPBUF (Pin 6/Pin 3): Ramp Buffer Output. Provides

a low impedance buffered version of the signal on the

RAMP pin. This buffered output drives the resistive volt-

age divider that connects to the TRACK pin. Limit the

capacitance at the RAMPBUF pin to less than 100pF. Float

RAMPBUF if unused.

RAMP (Pin 7/Pin 2): Ramp Buffer Input. The RAMP pin is

the input to the voltage buffer whose output drives a resis-

tive voltage divider connected to the TRACK pin. Connect

this input to a capacitor to set the ramp voltage generated

from internal 10μA pull-up or pull-down currents. RAMP

can also be connected to an external ramping signal for

tracking. Ground RAMP if unused.

ON (Pin 8/Pin 1): On Control Input. The voltage level of

the ON pin relative to its 1.23V threshold (with 75mV

hysteresis) controls the tracking direction of the LTC2927.

An active high causes a 10μA pull-up current to ﬂow at

the RAMP pin, which charges an external capacitor. An

active low at the ON pin causes a 10μA pull-down cur-

rent at the RAMP pin to discharge the external capacitor

relative to GND.

Exposed Pad (NA/Pin 9): Exposed pad may be left open

or connected to device ground.

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