LTC2935 datasheet(5/12 Pages) LINER

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LTC2935

2935fa

Supply Current vs S0, S1, S2

Input Voltage

Supply Current vs MR Input Voltage

PIN FUNCTIONS

Exposed Pad (DFN Only): Exposed Pad may be left ﬂoating

or connected to device ground.

GND: Device ground.

MR: Manual Reset Input. Attach a pushbutton switch

between this input and ground. A logic low on this input

pulls RST low. When the MR input returns to logic high,

RST returns high after 200ms. Tie to VCC if unused.

PFO: Power-Fail Output. PFO pulls low when VCC falls

below the power-fail threshold. The power-fail thresh-

old is above the conﬁgured falling reset threshold by a

pre-determined margin. PFO is released when VCC rises

above the power-fail threshold by 2.5%. PFO is available

with open-drain (LTC2935-1/LTC2935-3) or active pull-up

(LTC2935-2/LTC2935-4) outputs. Leave open if unused.

RST: Reset Output. RST pulls low when VCCfallsbelowthe

reset threshold. RST is released 200ms after VCC exceeds

the reset threshold plus 5% hysteresis. RST is available

with open-drain (LTC2935-1/LTC2935-3) or active pull-up

(LTC2935-2/LTC2935-4) outputs. Leave open if unused.

S2, S1, S0: Threshold Selection Inputs. Tie to GND or

VCC for required reset threshold. See the Falling Threshold

Selection Table on page 1 for settings.

VCC: Power Supply and Monitored Voltage Input. Bypass

VCC with a 0.1μF capacitor to GND.

TYPICAL PERFORMANCE CHARACTERISTICS

S0, S1, S2 INPUT VOLTAGE (V)

200

3.5

150

100

0.5

1.5

2.5

250

2935 G07

VCC = 3.6V

MR INPUT VOLTAGE (V)

3.5

0.5

1.5

2.5

2935 G08

VCC = 3.6V

TA = 25°C, unless otherwise noted.

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