LTC2954IDDB-2 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC2954IDDB-2

Pushbutton On/Off Controller with µP Interrupt

Linear Technology 

LTC2954

TYPICAL APPLICATIONS

External Pull-Up Resistor On PB

An internal pull-up resistor on the PB pin makes an ex-

ternal pull-up resistor unnecessary. Leakage current on

the PB board trace, however, will affect the open circuit

voltage on the PB pin. If the leakage is too large (>2μA),

the PB voltage may fall close to the threshold window. To

mitigate the effect of the board leakage, a 10k resistor to

VIN is recommended (see Figure 9).

Reverse Battery Protection

To protect the LTC2954 from a reverse battery connec-

tion, place a 1k resistor in series with the VIN pin (see

Figure 10).

VIN

VIN

R7

10k

PB

EXTERNAL BOARD

LEAKAGE CURRENT

>2μA

IF EXTERNAL PARASITIC BOARD

LEAKAGE >2μA, USE EXTERNAL

PULL-UP RESISTOR

LTC2954-1/

LTC2954-2

2.4V

100k

GND

PINS OMITTED

FOR CLARITY

2954 F09

Figure 9. External Pull-Up Resistor On PB Pin

2954fb

14

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