LTC4221

RECOMMENDED FOR NEW DESIGNS

Dual Hot Swap Controller/Power Sequencer with Dual Speed, Dual Level Fault Protection

Part Models: 4
1ku List Price: Starting From $4.09

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Overview

Allows Safe Board Insertion and Removal from a Live Backplane
Configurable Power Supply Sequencing
Soft-Start with Current Foldback Limits Inrush Current
No External Gate Capacitor Required
Adjustable Dual Level Circuit Breaker Protection
Controls Supply Voltages from 1V to 13.5V
Independent N-Channel MOSFET High Side Drivers
FB Pin Monitors V_OUT for Overvoltage Protection
Latch Off or Automatic Retry on Current Fault
FAULT and PWRGD Outputs
Narrow 16-Pin SSOP Package

The LTC4221 is a 2-channel Hot Swap^™ controller that allows a board to be safely inserted and removed from a live backplane. Using two independent high side gate drivers to control two external N-channel pass transistors, the output voltages can be ramped up with current foldback to limit the inrush current during the start-up period. No external compensation capacitors are required at the GATE pins. The two channels can be configured to ramp up and down separately or simultaneously for supply voltages ranging from 2.7V to 13.5V and 1V to 13.5V for channels 1 and 2 respectively.

Each channel has two current limit comparators that provide dual level and dual speed overcurrent circuit breaker protection after the start-up period. If any current sense voltage exceeds 100mV for 1µs or 25mV for the timeout delay (set by the C_FILTER at the FILTER pin), then the FAULT latch is set and both GATE pins are pulled low.

The FB pins monitor the respective channel output voltages and provide the inputs for the PWRGD comparators as well as overvoltage protection.

Applications

Electronic Circuit Breaker
Power Supply Sequencing
Live Board Insertion and Removal
Industrial High Side Switch/Circuit Breaker

Part Models: 4
1ku List Price: Starting From $4.09

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4221CGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4221CGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4221IGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4221IGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC4221CGN#PBF	PRODUCTION
LTC4221CGN#TRPBF	PRODUCTION
LTC4221IGN#PBF	PRODUCTION
LTC4221IGN#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package
		PCN22_0235_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC4221CGN#PBF	PRODUCTION
LTC4221CGN#TRPBF	PRODUCTION
LTC4221IGN#PBF	PRODUCTION
LTC4221IGN#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG]
		PCN22_0066_Form Material_Report Delta Qualification Matrix
LTC4221CGN#PBF	PRODUCTION
LTC4221CGN#TRPBF	PRODUCTION
LTC4221IGN#PBF	PRODUCTION
LTC4221IGN#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LTC4226	PRODUCTION	Wide Operating Range Dual Hot Swap Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4221

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.