LTC2934

5

2934f

Supply Current vs RT

Input Voltage

Supply Current vs MR Input Voltage

PIN FUNCTIONS

ADJ: Reset Threshold Adjustment Input. Tie to resistive

divider between monitored voltage and GND to configure

desired reset threshold. See the Applications Information

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

or connected to device ground.

GND: Device Ground.

MR: Manual Reset Input. Attach a push-button 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 the reset timer has expired. Tie to

PFI: Power-Fail Threshold Adjustment Input. Tie to

resistive divider between monitored voltage and GND

to configure desired power-fail threshold. See the

GND if unused.

PFO: Power-Fail Output. PFO pulls low when monitored

voltage falls below the power-fail (PFI) threshold. PFO

is released when the PFI voltage rises above the power-

fail threshold by 2.5%. PFO is available with open-drain

(LTC2934-1) or active pull-up (LTC2934-2) outputs. Leave

open if unused.

RST: Reset Output. RST pulls low when monitored volt-

age falls below the reset threshold. RST is released after

monitored voltage exceeds the reset threshold plus 5%

hysteresis and after reset timer has expired. RST is available

with open-drain (LTC2934-1) or active pull-up (LTC2934-2)

outputs. Leave open if unused.

desired reset timeout. Tie low for 15ms delay or high for

200ms delay.

GND.

TYPICAL PERFORMANCE CHARACTERISTICS

RT INPUT VOLTAGE (V)

0

200

3.5

150

100

12

0.5

1.5

2.5

3

4

50

0

250

2934 G07

MR INPUT VOLTAGE (V)

0

4

3.5

3

2

12

0.5

1.5

2.5

3

4

1

0

5

2934 G08