MAX4843, MAX4844, MAX4845, MAX4846 Overvoltage Protection Controllers with Low Standby Current

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Description

The MAX4843–MAX4846 overvoltage protection controllers protect low-voltage systems against high-voltage faults of up to 28V. When the input voltage exceeds the overvoltage threshold, these devices turn off a low-cost, external n-channel FET(s) to prevent damage to the protected components. An internal charge pump eliminates the need for external capacitors and drives the FET gate for a simple, robust solution.

The overvoltage trip level is set to 7.4V (MAX4843), 6.35V (MAX4844), 5.8V (MAX4845), or 4.65V (MAX4846). When the input voltage drops below the undervoltage lockout (UVLO) threshold, the devices enter a low standby current mode (10µA). The MAX4843/MAX4844/MAX4845 have a UVLO threshold of 4.15V, and the MAX4846 has a UVLO threshold of 2.5V. In addition to the single FET configuration, the devices can be configured with back-to-back external FETs to prevent currents from being back-driven into the adapter.

An additional feature includes a ±15kV ESD-protected input when bypassed with a 1µF capacitor to ground. All devices are offered in small 6-pin µDFN (1.5mm x 1.0mm) and 6-pin ultra-thin LGA (MAX4845EYT+T only) (1.5mm x 1.0mm) packages and are specified for operation over the -40°C to +85°C temperature range.

Key Features

Applications/Uses

Overvoltage Protection Up to 28V
Preset 7.4V, 6.35V, 5.8V, or 4.65V Overvoltage Trip Level
Low (10µA) Undervoltage Lockout Standby Current
Drives Low-Cost nMOSFET
Internal 50ms Startup Delay
Internal Charge Pump
Overvoltage Fault FLAG Indicator
6-Pin (1.5mm x 1.0mm) µDFN Package

	Cell Phones
	Digital Still Cameras
	MP3 Players
	PDAs and Palmtop Devices

Key Specifications: Overvoltage Protection Controllers

Part Number

Number of Channels

VIN Min (V)

VIN Max (V)

Overvoltage Trip Level (V)

Undervoltage Lockout (V)

GATE Voltage (V)

Overvoltage Flag

GATE Turn-On Time (ms)

GATE Turn Off Time (us)

Features

Package

Smallest Available Package (max w/pins) (mm²)

RoHS Available

Price^*

MAX4843

1.2

7.4

4.15

Open-Drain

•	Internal Charge Pump

•	Soft Start

MicroDFN/6

$0.70 @ 1k

MAX4844

6.35

4.15

MicroDFN/6

Yes

$0.70 @ 1k

MAX4845

5.8

4.15

MicroDFN/6
Ultra Thin MicroDFN/6

Yes

$0.70 @ 1k

MAX4846

4.65

2.5

MicroDFN/6

Yes

See All Overvoltage Protection Controllers (32)

Notes:
^*This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-18 of 18

MAX4843

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX4843ELT

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX4843ELT-T

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX4844

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX4844ELT

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX4844ELT+

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4844ELT-T

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX4844ELT+T

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4845

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX4845ELT

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX4845ELT+

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4845ELT+T

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4845ELT-T

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX4845EYT+T

Ultra Thin MicroDFN;6 pin;
Dwg: 21-0190A (PDF)
Use pkgcode/variation: Y61A1+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4845EYT+

Ultra Thin MicroDFN;6 pin;
Dwg: 21-0190A (PDF)
Use pkgcode/variation: Y61A1+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4845EYT+C5Y

Ultra Thin MicroDFN;6 pin;
Dwg: 21-0190A (PDF)
Use pkgcode/variation: Y61A1+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4846

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX4846ELT

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX4846ELT+

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4846ELT+TG104

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4846ELT+T

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4846ELT-T

MicroDFN;6 pin;2 mm²
Dwg: 21-0147E (PDF)
Use pkgcode/variation: L611-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis