MAX4865 MAXIM [Maxim Integrated Products], MAX4865 Datasheet

MAX4865

Manufacturer Part Number

MAX4865

Description

Overvoltage Protection Controllers with Reverse Polarity Protection

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX4865.pdf (12 pages)

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The MAX4864L/MAX4865L/MAX4866L/MAX4867/

MAX4865/MAX4866 overvoltage protection controllers

protect low-voltage systems against high-voltage faults

up to +28V, and negative voltages down to -28V. These

devices drive a low-cost complementary MOSFET. If the

input voltage exceeds the overvoltage threshold, these

devices turn off the n-channel MOSFET to prevent dam-

age to the protected components. If the input voltage

drops below ground, the devices turn off the p-channel

MOSFET to prevent damage to the protected compo-

nents. An internal charge pump eliminates the need for

external capacitors and drives the MOSFET GATEN for

a simple, robust solution.

The overvoltage thresholds are preset to +7.4V

(MAX4864L), +6.35V (MAX4865L), +5.8V (MAX4866L),

and +4.65V (MAX4867). When the input voltage drops

below the undervoltage lockout (UVLO) threshold, the

devices enter a low-current standby mode (8.5µA). Also in

shutdown (EN set to logic-high), the current is reduced fur-

ther (0.4µA). The MAX4864L/MAX4865L/MAX4866L have

a +2.85V UVLO threshold, and the MAX4867 has a +2.5V

UVLO threshold. The MAX4865/MAX4866 have a 4.15V

UVLO threshold.

In addition, a ±15kV ESD protection is provided to the

input when bypassed with a 1µF capacitor to ground. All

devices are offered in a small 6-pin SOT23 and a 6-pin,

2mm x 2mm µDFN package, and are specified for

operation over the -40°C to +85°C temperature range.

19-3582; Rev 1; 5/06

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.

Cell Phones

Digital Still Cameras

ADAPTER

(-28V TO +28V)

1µF

Typical Operating Circuit

________________________________________________________________ Maxim Integrated Products

GATEP

GND

General Description

MAX4864L

MAX4865L

MAX4866L

MAX4867

PDAs and Palmtop Devices

MP3 Players

Overvoltage Protection Controllers

GATEN

FLAG

Applications

with Reverse Polarity Protection

OUTPUT

♦ Overvoltage Protection Up to +28V

♦ Reverse Polarity Protection Down to -28V

♦ Preset Overvoltage (OV) Trip Level (7.4V, 6.35V,

♦ Drive Low-Cost Complementary MOSFET

♦ Internal 50ms Startup Delay

♦ Internal Charge Pump

♦ 8.5µA Standby Current (In UVLO Mode)

♦ 0.4µA Shutdown Current

♦ Overvoltage Fault FLAG Indicator

♦ 6-Pin (2mm x 2mm) µDFN and 6-Pin SOT23

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

range.

Functional Diagram appears at end of data sheet.

M A X4 8 6 4 L E U T- T 6 S OT23- 6

M AX 4864LE LT

M A X4 8 6 5 L E U T- T 6 S OT23- 6

M AX 4865LE LT

M A X4 8 6 6 L E U T- T 6 S OT23- 6

M AX 4866LE LT

M A X4 8 6 7 E U T- T

M AX 4867E LT

TOP VIEW

FLAG

GND

5.8V, 4.65V)

Packages

PA R T

MAX4864L

MAX4865L

MAX4866L

MAX4867

SOT23

PIN -

PA C K A G E

6 µD FN

6 S OT23- 6

6 µD FN

Ordering Information

GATEP

GATEN

Pin Configurations

FLAG

GND

LEVEL (V)

OV TRIP

7.40

6.35

5.80

4.65

MAX4864L

MAX4865L

MAX4866L

MAX4867

µDFN

Features

MARK

ABVO

ABVQ

ABVP

ABVN

TOP

AAG L622-1

AAD L622-1

AAE L622-1

AAF L622-1

CODE

PKG

GATEN

GATEP

—

Related parts for MAX4865

MAX4865 Summary of contents

Page 1

... The MAX4864L/MAX4865L/MAX4866L have a +2.85V UVLO threshold, and the MAX4867 has a +2.5V UVLO threshold. The MAX4865/MAX4866 have a 4.15V UVLO threshold. In addition, a ±15kV ESD protection is provided to the input when bypassed with a 1µF capacitor to ground. All devices are offered in a small 6-pin SOT23 and a 6-pin, 2mm x 2mm µ ...

Page 2

... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +5V (MAX4864L/MAX4865L/MAX4866L noted. Typical values are +25°C.) (Note 1) ...

Page 3

... Overvoltage Protection Controllers ELECTRICAL CHARACTERISTICS (continued +5V (MAX4864L/MAX4865L/MAX4866L noted. Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL EN Input Leakage Current I LKG TIMING Startup Delay t START FLAG Blanking Time t BLANK GATEN Turn-On Time t GON GATEN Turn-Off Time t Goff FLAG Assertion Delay ...

Page 4

... SUPPLY VOLTAGE (V) MAX4864L/MAX4865L/MAX4866L GATEN VOLTAGE vs. INPUT VOLTAGE 15 MAX4864L 12 9 MAX4865L 6 3 MAX4866L INPUT VOLTAGE (V) POWER-UP RESPONSE 4 _______________________________________________________________________________________ Typical Operating Characteristics Typical Operating Characteristics REVERSE CURRENT vs. OUTPUT VOLTAGE (MAX4864L) 0 0.3 0.2 ...

Page 5

... Overvoltage Protection Controllers (T = +25°C, unless otherwise noted.) A POWER-UP OVERVOLTAGE RESPONSE 20ms/div PIN MAX4864LEUT/ MAX4864LELT/ MAX4865LEUT/ MAX4865LELT/ MAX4866LEUT/ MAX4866LELT/ MAX4867EUT MAX4867ELT GATEN 5 5 GATEP 6 4 _______________________________________________________________________________________ with Reverse Polarity Protection Typical Operating Characteristics (continued) NEGATIVE VOLTAGE RESPONSE ...

Page 6

... IN the GATEN driver is held low and FLAG is asserted. Overvoltage Lockout (OVLO) The MAX4864L has a +7.4V typical OVLO threshold; the MAX4865L has +6.35V typical OVLO threshold; the MAX4866L has a +5.8V typical OVLO threshold; and the MAX4867 has a +4.65V typical OVLO threshold. When V is greater than OVLO, the GATEN driver is IN held low and FLAG is asserted ...

Page 7

... IO MOSFETs. In most situations, MOSFETs with RDS(ON) specified for a VGS of 4.5V work well. Also the V should be +30V for the MOSFET to withstand the full +28V IN range of the MAX4864L/MAX4865L/ MAX4866L/MAX4867. Table 1 shows a selection of MOSFETs which are appropriate for use with the MAX4864L/MAX4865L/MAX4866L/MAX4867. For most applications, bypass ADAPTER to GND with a 1µ ...

Page 8

... IEC 1000-4-2 specification. The IEC 1000-4-2 standard covers ESD testing and perfor- mance of finished equipment. It does not specifically refer to ICs. The MAX4864L/MAX4865L/MAX4866L/ MAX4867 help users design equipment that meets Level 3 of IEC 1000-4-2, without additional ESD-protec- tion components. ...

Page 9

... Overvoltage Protection Controllers with Reverse Polarity Protection ADAPTER P GATEP GND +15V CLAMP +5.5V REGULATOR UVLO AND OVLO DETECTOR EN _______________________________________________________________________________________ Functional Diagram N IN GATEN MAX4864L MAX4865L MAX4866L MAX4867 2x CHARGE GATE PUMP DRIVER CONTROL FLAG LOGIC AND TIMER OUTPUT ...

Page 10

Overvoltage Protection Controllers with Reverse Polarity Protection (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) D XXXX XXXX XXXX SAMPLE PIN 1 INDEX AREA MARKING ...

Page 11

Overvoltage Protection Controllers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) COMMON DIMENSIONS SYMBOL MIN. NOM. A 0.70 0.75 A1 0.15 0.20 A2 0.020 0.025 ...

Page 12

Overvoltage Protection Controllers with Reverse Polarity Protection (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other ...

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