Maxim Integrated Semiconductor Electronic Components Datasheet

MAX4923 Datasheet

(MAX4923 - MAX4926) Overvoltage Protectors

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19-0810; Rev 0; 4/07

Overvoltage Protectors with

External pFET

General Description

The MAX4923–MAX4926 overvoltage protection

(OVP) controllers protect low-voltage systems against

high-voltage faults of up to +28V with an appropriate

external pFET. When the input voltage exceeds the over-

voltage lockout (OVLO) threshold, or falls below the

undervoltage lockout (UVLO) threshold, these devices

turn off the pFET to prevent damage to protected compo-

nents and issue a flag to notify the processor of a fault

condition.

The typical overvoltage trip level is set to 7.18V

(MAX4923), 6.16V (MAX4924), 5.65V (MAX4925), and

4.46V (MAX4926). The undervoltage trip level is set to

2.44V (typ) for all devices.

The input (IN) is ESD protected to ±15kV HBM when

bypassed to ground with a 1µF ceramic capacitor. All

devices are offered in a small, 6-pin (1.5mm x 1.0mm)

µDFN package and are specified over the extended

-40°C to +85°C temperature range.

Applications

Cell Phones

Digital Still Cameras

PDAs and Palmtop Devices

MP3 Players

Pin Configuration

TOP VIEW

N.C N.C GATE

6 54

Features

o Overvoltage Protection Up to +28V

o Preset 7.18V, 6.16V, 5.65V, and 4.46V Typical

Overvoltage Trip Levels

o Preset 2.44V Typical Undervoltage Trip Level

o ±2.5% Accurate Overvoltage/Undervoltage

Trip Levels

o Low 13µA (typ) Supply Current

o Drives External pFET

o 20ms Adapter Debounce Time

o Fault Flag Indicator

o 6-Pin (1.5mm x 1.0mm) µDFN Package

Typical Operating Circuit

INPUT

+1.8V TO 28V

1μF

P OUTPUT

GATE

MAX4923–MAX4926

VIO

MA4923–MAX4926

GND

FLAG

123

IN GND FLAG

μDFN

Ordering Information/Selector Guide

PART

PIN-PACKAGE

OVLO (V)

UVLO (V)

TOP MARK

PKG CODE

MAX4923ELT+*

6 μDFN

7.18

2.44

L611-1

MAX4924ELT+

6 μDFN

6.16

2.44

L611-1

MAX4925ELT+

6 μDFN

5.65

2.44

L611-1

MAX4926ELT+

6 μDFN

4.46

2.44

L611-1

Note: All devices are specified over the -40°C to +85°C operating temperature range.

+Denotes lead-free package.

*Future Product—contact factory for availability.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Maxim Integrated Semiconductor Electronic Components Datasheet

MAX4923 Datasheet

(MAX4923 - MAX4926) Overvoltage Protectors

No Preview Available !

Overvoltage Protectors with

External pFET

ABSOLUTE MAXIMUM RATINGS

IN, GATE to GND....................................................-0.3V to +30V

FLAG to GND ...........................................................-0.3V to +6V

Continuous Power Dissipation (TA = +70°C)

6-µDFN (derate 2.1mW/°C above 70°C) .......................168mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature .....................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) ................................+300 °C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VIN = +5V for MAX4923/MAX4924/MAX4925, VIN = +4V for MAX4926, CGATE = 500pF to IN, TA = -40°C to +85°C, unless otherwise

noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Input Voltage Range

VIN

MAX4923

1.8 28.0

7.00 7.18 7.36

Overvoltage Lockout Level

OVLO VIN rising

MAX4924

MAX4925

6.00 6.16 6.31

5.50 5.65 5.79

MAX4926

4.35 4.46 4.57

MAX4923

Overvoltage Lockout Hysteresis

MAX4924

MAX4925

MAX4926

Undervoltage Lockout Level

UVLO VIN falling

2.378 2.439 2.500

Undervoltage Lockout Hysteresis

20 mV

IN Supply Current

GATE Voltage High

GATE Pulldown Current

FLAG Low Voltage

FLAG Leakage Current

TIMING CHARACTERISTICS

Debounce Time

IIN

VOH

IPD

VOL

ILKG

MAX4923/MAX4924/MAX4925

MAX4926

VIN > 8V, ISOURCE = 0.1mA

VGATE = VIN

ISINK = 1mA

VFLAG = 5.5V

14 25

13 23

µA

VIN -

0.2

6.5 12

0.4 V

-1 +1 µA

tDEB

VUVLO < VIN < VOVLO, time for GATE to go

low (Figure 1)

Gate Turn-on Time

VGATE = 5V to 0.5V

tGON (MAX4923/MAX4924/MAX4925) or

0.6 µs

VGATE = 4V to 0.5V (MAX4926) (Figure 1)

Gate Turn-Off Time

tGOFF

VIN rising at 1V/µs from 5V to 8V

(MAX4923/MAX4924/MAX4925) or from 4V

to 7V (MAX4926) to VGATE = VIN -0.5V

(Figure 1)

5 20 µs

Flag Assertion Delay

tFLAG

VIN rising at 1V µs from 5V to 8V

(MAX4923/MAX4924/MAX4925) or from 4V

to 7V (MAX4926), to VFLAG = 2.4V,

RFLAG = 10kΩ to 3V (Figure 1)

4.5

µs

Note 1: All devices are 100% tested at +25°C. Electrical limits across the full temperature range are guaranteed by design and characterization.

2 _______________________________________________________________________________________

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MAX4923 Datasheet

(MAX4923 - MAX4926) Overvoltage Protectors

MAX4923 Datasheet

(MAX4923 - MAX4926) Overvoltage Protectors

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