LTC2919CMS-2.5-PBF データシートの表示（PDF） - Linear Technology

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LTC2919CMS-2.5-PBF

Precision Triple/Dual Input UV, OV and Negative Voltage Monitor

Linear Technology 

FEATURES

■ Two Low Voltage Adjustable Inputs (0.5V)

■ Accurate UVLO Provides a Third Monitor Input

■ Open-Drain RST, OUT1 and OUT2 Outputs

■ Pin Selectable Input Polarity Allows Negative, UV

and OV Monitoring

■ Guaranteed Threshold Accuracy: ±1.5%

■ 6.5V Shunt Regulator for High Voltage Operation

■ Low 50μA Quiescent Current

■ Buffered 1V Reference for Negative Supply Offset

■ Input Glitch Rejection

■ Adjustable Reset Timeout Period

■ Selectable Internal Timeout Saves Components

■ Outputs Guaranteed Low With VCC = 0.5V

■ Space Saving 10-Lead 3mm × 2mm DFN and MSOP

Packages

U

APPLICATIO S

■ Desktop and Notebook Computers

■ Network Servers

■ Core, I/O Monitor

■ Automotive

LTC2919

Precision Triple/Dual Input

UV, OV and Negative

Voltage Monitor

DESCRIPTIO

The LTC®2919 is a triple/dual input monitor intended for a

variety of system monitoring applications. Polarity selec-

tion and a buffered reference output allow the LTC2919 to

monitor positive and negative supplies for undervoltage

(UV) and overvoltage (OV) conditions.

The two adjustable inputs have a nominal 0.5V threshold,

featuring tight 1.5% threshold accuracy over the entire

operating temperature range. Glitch filtering ensures out-

puts operate reliably without false triggering. An accurate

threshold at the VCC pin provides a third input supply

monitor for a 2.5V, 3.3V or 5V supply.

Two independent output pins indicate the status of each

adjustable input. A third common output provides a

configurable reset timeout that may be set by an accu-

rate internal 200ms timer, programmed with an external

capacitor, or disabled for a fast response. A three-state

input pin sets the input polarity of each adjustable input

without requiring any external components.

The LTC2919 provides a highly versatile, precise, space-

conscious, micropower solution for supply monitoring.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Protected by U.S. Patents,

including 6949965, 7292076.

TYPICAL APPLICATIO

3.3V UV/OV (Window) Monitor Application with

200ms Internal Timeout (3.3V Logic Out)

3.3V

453k

10.7k

76.8k

VCC

LTC2919–2.5

ADJ1 OUT1

REF

OUT2

ADJ2

RST

SEL

TMR

GND

10k

10k

UV

OV

0.1μF

10k

FAULT

2919 TA01a

SEL Pin Connection for Input Polarity

Combinations

POLARITY

ADJ1

ADJ2

SEL PIN

+

+

VCC

+

–

OPEN

–

–

GND

2919f

1

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