LTC2935

1

2935fa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Ultra-Low Power Supervisor

with Power-Fail Output,

Selectable Thresholds

system initialization, power-fail warning and reset gen-

eration functions. Low quiescent current (500nA typical)

makes the LTC2935 an ideal choice for battery-operated

applications.

Three binary threshold-select inputs configure one of

eight integrated reset thresholds, ranging from 1.6V to

3.45V in pre-determined increments. Early warning of an

impending low voltage condition is provided at the power-

fail output (PFO), whose threshold is above the configured

condition, an internal reset timer is started after exceeding

the reset threshold by 5%. A 200ms reset timeout delays

the return of the RST output to a high state. A pushbut-

ton switch connected to the MR input is typically used to

force a manual reset. Outputs RST and PFO are available

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

(LTC2935-2/LTC2935-4) circuits. Operating temperature

range is from –40°C to 85°C.

Configurable Low Power Voltage Monitor

× 2mm DFN and

TSOT-23 (ThinSOT™) Packages

Falling Threshold Selection Table

BATTERY

POWERED

SYSTEM

LOGIC

2935 TA01a

S2

S1

0.1μF

PFO

RST

S0

MR

LTC2935-2

GND

LTC2935-1/LTC2935-2

LTC2935-3/LTC2935-4

RESET

THRESHOLD

(V)

POWER-FAIL

THRESHOLD

(V)

RESET

THRESHOLD

(V)

POWER-FAIL

THRESHOLD

(V)

S2S1S0

3.30

3.45

2.44

2.56

Low

Low

Low

3.15

3.30

2.32

2.44

Low

Low

High

3.00

3.15

2.20

2.32

Low

High

High

2.85

3.00

2.08

2.20

Low

High

Low

2.70

2.85

1.96

2.08

High

High

Low

2.55

2.70

1.84

1.96

High

Low

Low

2.40

2.55

1.72

1.84

High

Low

High

2.25

2.40

1.60

1.72

High

High

High

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners.