LM66100 5.5-V - 1.5-A - Low IQ Ideal Diode With Input Polarity Protection

Sep 26, 2026

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LM66100 is a single-input, single-output (SISO) integrated ideal diode designed to pass power in one direction with reverse polarity protection and input polarity protection. It supports a wide input range of 1.5 V to 5.5 V and a maximum continuous current of 1.5 A. The device uses a P-channel MOSFET with comparator-controlled chip enable to disable when CE exceeds VIN and enable when CE is lower. When used in an ORing configuration, two devices can pass the highest input voltage while blocking reverse current. Typical packaging is SC-70 (6), operating from –40°C to 125°C.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages23

Reading Time58 min

AccessFree to download

Features

Applications

Description

Revision History

Pin Configuration and Functions

Pin Functions

Specifications

Absolute Maximum Ratings

ESD Ratings

Recommended Operating Conditions

Thermal Information

Electrical Characteristics

Switching Characteristics

Typical Characteristics

Parameter Measurement Information

Detailed Description

Overview

Functional Block Diagram

Feature Description

Device Functional Modes

Application and Implementation

Application Information

Typical Applications

Power Supply Recommendations

Layout

Layout Guidelines

Layout Example

Device and Documentation Support

Receiving Notification of Documentation Updates

Community Resources

Trademarks

Electrostatic Discharge Caution

Glossary

Mechanical, Packaging, and Orderable Information

LM66100 5.5-V, 1.5-A 79-mΩ, Low IQ Ideal Diode With Input Polarity Protection 1 Features • Wide operating voltage range: 1.5 V – 5.5 V • Reverse voltage standoff on VIN: –6-V absolute maximum • Maximum continuous current (IMAX): 1.5 A • On-Resistance (RON): – 5-V VIN = 79-mΩ (typical) – 3.6-V VIN = 91-mΩ (typical) – 1.8-V VIN = 141-mΩ (typical) • Comparator chip enable (CE) • Channel status indication (ST) • Low current consumption: – 3.6-V VIN Shutdown current (ISD,VIN): 120-nA (typical) – 3.6-V VIN Quiescent current (IQ, VIN): 150-nA (typical) 2 Applications • Smart meters • Building automation • GPS and tracking • Primary and backup batteries 3 Description The LM66100 is a Single-Input, Single-Output (SISO) integrated ideal diode that is well suited for a variety of applications. The device contains a P-channel MOSFET that can operate over an input voltage range of 1.5 V to 5.5 V and can support a maximum continuous current of 1.5 A. The chip enable works by comparing the CE pin voltage to the input voltage. When the CE pin voltage is higher than VIN, the device is disabled and the MOSFET is off. When the CE pin voltage is lower, the MOSFET is on. The LM66100 also comes with reverse polarity protection (RPP) that can protect the device from a miswired input, such as a reversed battery. Two LM66100 devices can be used in an ORing configuration similar to a dual diode ORing implementation. In this configuration, the devices pass the highest input voltage to the output while blocking reverse current flow into the input supplies. These devices can compare input and output voltages to make sure that reverse current is blocked through an internal voltage comparator. The LM66100 is available in a standard SC-70 package characterized for operation over a junction temperature range of –40°C to 125°C. Device Information(1) | PART NUMBER | PACKAGE | BODY SIZE (NOM) | | --- | --- | --- | | LM66100 | SC-70 (6) | 2.1 mm x 2.0 mm | (1) For all available packages, see the orderable addendum atthe end of the data sheet. Typical Application An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LM66100 SLVSEZ8A –MARCH 2019–REVISED JUNE 2019 [www.ti.com](www.ti.com) | Table of Contents | | | --- | --- | | 1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions ....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics ........................................... 5
6.6 Switching Characteristics .......................................... 5
6.7 Typical Characteristics .............................................. 6
7 Parameter Measurement Information .................. 7
8 Detailed Description .............................................. 8
8.1 Overview ................................................................... 8
8.2 Functional Block Diagram ......................................... 8 | 8.3 Feature Description ................................................... 9
8.4 Device Functional Modes........................................ 10
9 Application and Implementation ........................ 10
9.1 Application Information...

FAQs

What input voltage range and maximum continuous current does the LM66100 support?

The LM66100 operates over an input voltage range of 1.5 V to 5.5 V and supports a maximum continuous current of 1.5 A.

How does the chip enable (CE) control the MOSFET state?

The device compares the CE pin voltage to VIN: when CE is higher than VIN the device is disabled and the MOSFET is off; when CE is lower, the MOSFET is on.

What is the purpose of the LM66100 reverse polarity protection (RPP)?

RPP protects the device from a miswired input such as a reversed battery, helping prevent damage due to incorrect input polarity.

Sep 26, 2026

Upload by Bulrr