LTC7149

RECOMMENDED FOR NEW DESIGNS

60V, 4A Synchronous Step-Down Regulator for Inverting Outputs

Part Models: 8
1ku List Price: Starting From $6.72

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Overview

Wide V_IN Range: 3.4V to 60V
Wide V_OUT Range: 0V to –28V
Single Resistor V_OUT Programming
Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
Regulated I_Q: 440μA, Shutdown I_Q: 15μA
Board GND Referenced I/O Pins (RUN, PGOOD, MODE/SYNC)
Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range
92% Efficiency with 12 V_IN and –5V_OUT
±0.8% Output Voltage Accuracy
Peak Current Mode Operation
Burst Mode^® Operation, Forced Continuous Mode
Programmable Soft-Start
Overtemperature Protection
Available in 28-Lead (4mm x 5mm) QFN and TSSOP Packages

The LTC7149 is a high efficiency 60V, 4A synchronous monolithic step-down regulator for inverting output applications. The regulator features a single resistor programmable output voltage and high efficiency over a wide V_OUT range.

The inverting regulator operates from an input voltage range of 3.4V to 60V and provides an adjustable output from (–28V) to zero volts while delivering up to 4A of inductor current. The switching frequency is also set with an external resistor. A user-selectable mode input is provided to allow the user to trade off ripple noise for efficiency at light loads; Burst Mode operation provides the highest efficiency at light loads, while forced continuous mode provides low output ripple. The MODE/SYNC pin can also be used to synchronize the switching frequency to an external clock. Internal level-shift circuits allow the I/O pins (RUN, MODE/SYNC, PGOOD) to be referenced to board GND.

The LTC7149 operates with a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection.

Applications

Industrial Applications
Telecom Power Supplies
Distributed Power Systems

Part Models: 8
1ku List Price: Starting From $6.72

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
LTC7149EFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7149EFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7149EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7149EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7149IFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7149IFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7149IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7149IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LTC7149EFE#PBF	PRODUCTION
LTC7149EFE#TRPBF	PRODUCTION
LTC7149IFE#PBF	PRODUCTION
LTC7149IFE#TRPBF	PRODUCTION
May 17, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LTC7149EFE#PBF	PRODUCTION
LTC7149EFE#TRPBF	PRODUCTION
LTC7149EUFD#PBF	PRODUCTION
LTC7149EUFD#TRPBF	PRODUCTION
LTC7149IFE#PBF	PRODUCTION
LTC7149IFE#TRPBF	PRODUCTION
LTC7149IUFD#PBF	PRODUCTION
LTC7149IUFD#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
LTC4367	RECOMMENDED FOR NEW DESIGNS	100V Overvoltage, Undervoltage and Reverse Supply Protection Controller

Parts	Product Life Cycle	Description
LTC3649	RECOMMENDED FOR NEW DESIGNS	60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC7149

LTpowerCAD 1

LTC7149 Project - Inverting Buck Regulator (3.5-55V to -5V @ 4A)

Design tools for the following parts are available in LTpowerCAD:

LTC7149

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.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

LTC7149 Demo Board | Buck Configured as Negative VOUT; 3.5V ≤ VIN ≤ 55V; VOUT = –3.3V/–5V/Adjustable to –56V @ up to 4A

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Product Details

Demonstration circuit 2354A is a high input voltage, high efficiency synchronous monolithic step-down converter with a negative output voltage featuring the LTC7149. DC2354A has a wide input voltage range from 3.5V up to 55V. The output voltage of the DC2354A can be set to –3.3V or –5V, and the “User Select” option allows the output voltage to be set from 0V to –60V; however the voltage difference between the output voltage (–V_OUT) and maximum input voltage (V_IN), should not exceed 60V. |–V_OUT| + V_IN < 60V. DC2354A is capable of delivering up to 4A of output current, nevertheless at lower input voltages, the load current should be reduced in accordance with the derating curves. DC2354A supports three operation modes: fixed-frequency modulation, Burst Mode^™ operation and synchronization to an external clock. Fixed-frequency mode maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode operation employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.