NCP345SNT1G ON Semiconductor, NCP345SNT1G Datasheet

Supervisory Circuits 6.85V OVP Supervisor

NCP345SNT1G

Manufacturer Part Number

NCP345SNT1G

Description

Supervisory Circuits 6.85V OVP Supervisor

Manufacturer

ON Semiconductor

Datasheet

1.NCP345SNT1G.pdf (8 pages)

Specifications of NCP345SNT1G

Number Of Voltages Monitored

Monitored Voltage

6.85 V

Overvoltage Threshold

6.85 V

Output Type

PFET Driver

Manual Reset

Resettable

Watchdog

No Watchdog

Supply Voltage (max)

25 V

Supply Voltage (min)

3 V

Supply Current (typ)

750 uA

Maximum Power Dissipation

216 mW

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Package / Case

SOT-23-5 Thin (TSOP-5)

Minimum Operating Temperature

- 40 C

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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NCP345

Overvoltage Protection IC

sensitive electronic circuitry from overvoltage transients and power

supply faults when used in conjunction with an external P−channel

FET. The device is designed to sense an overvoltage condition and

quickly disconnect the input voltage supply from the load before any

damage can occur. The OVP consists of a precise voltage reference, a

comparator with hysteresis, control logic, and a MOSFET gate driver.

The OVP is designed on a robust BiCMOS process and is intended to

withstand voltage transients up to 30 V.

AC/DC adapter or car accessory charger to power the product and/or

recharge the internal batteries. The nominal overvoltage threshold is

6.85 V so it is suitable for single cell Li−Ion applications as well as 3/4

cell NiCD/NiMH applications.

Features

•

Typical Applications

•

March, 2006 − Rev. 6

The NCP345 overvoltage protection circuit (OVP) protects

The device is optimized for applications that have an external

Overvoltage Turn−Off Time of less than 1.0 msec

Accurate Voltage Threshold of 6.85 V (nominal)

Undervoltage Lockout Protection

CNTRL Input Compatible with 1.8 V Logic Levels

Pb−Free Package is Available

Cellular Phones

Digital Cameras

Portable Computers and PDAs

Portable CD and other Consumer Electronics

Accessory Charger

AC/DC Adapter or

GND

Figure 1. Simplified Application Diagram

−

ref

Undervoltage

Lock Out

Logic

CNTRL

Microprocessor port

NCP345

Driver

FET

Note: This device contains 89 active transistors

NCP345SNT1

NCP345SNT1G

†For information on tape and reel specifications,

OUT

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

P−CH

Device

CNTRL

GND

RAD = Specific Device Code

(Note: Microdot may be in either location)

ORDERING INFORMATION

OUT

PIN CONNECTIONS &

MARKING DIAGRAM

= Assembly Location

= Year

= Work Week

= Pb−Free Package

http://onsemi.com

Schottky

SOT−23−5

(Pb−Free)

Diode

(Top View)

Package

Publication Order Number:

THIN SOT−23−5

SN SUFFIX

CASE 483

3000 / Tape &

(7 inch Reel)

Shipping

LOAD

NCP345/D

Reel

†

Related parts for NCP345SNT1G

NCP345SNT1G Summary of contents

Page 1

... ORDERING INFORMATION Device Package Shipping NCP345SNT1 SOT−23−5 3000 / Tape & NCP345SNT1G SOT−23−5 (7 inch Reel) (Pb−Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. ...

Page 2

IN ( Pre− regulator R1 R2 Bandgap Reference CNTRL (3) PIN FUNCTION DESCRIPTIONS Pin # Symbol 1 OUT This signal drives the gate of a P−channel MOSFET controlled by the voltage level ...

Page 3

ABSOLUTE MAXIMUM RATINGS (T Rating OUT voltage to GND Input and CNTRL pin voltage to GND V Maximum Range CC Maximum Power Dissipation 85°C A Thermal Resistance Junction to Air Junction Temperature Operating Ambient Temperature V Operating ...

Page 4

Ambient Temperature (°C) Figure 3. Typical V Threshold Variation vs. th Temperature 1.0 0.9 0.8 0.7 0.6 0.5 −40 Figure 5. Typical Supply Current vs. Temperature ...

Page 5

AC/DC Adapter or Accessory Charger IN Zener Diode (optional) GND Introduction In many electronic products, an external AC/DC wall adapter is used to convert the AC line voltage into a regulated DC voltage or a current limited source. Line surges ...

Page 6

Normal Operation Figure 1 illustrates a typical configuration. The external adapter provides power to the protection system so the circuitry is only active when the adapter is connected. The OVP monitors the voltage from the charger and if the voltage ...

Page 7

... H SOLDERING FOOTPRINT* 0.95 0.037 1.0 0.039 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. NCP345 THIN SOT−23−5 SN SUFFIX CASE 483−02 ISSUE E NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14 ...

Page 8

... Fax: 480−829−7709 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com NCP345 N. American Technical Support: 800−282−9855 Toll Free USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Phone: 81−3−5773−3850 http://onsemi.com 8 ON Semiconductor Website: http://onsemi ...

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