LTC3446

PRODUCTION

Monolithic Buck Regulator with Dual VLDO Regulators

Data Sheet Product Selection Table

Part Models: 4
1ku List Price: Starting From $3.31

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Part Details

High Efficiency Triple Step-Down Outputs from a Single Input Supply
1A Synchronous Buck Regulator Provides Main Step-Down Output and Powers Two 300mA VLDO^™ Linear Regulators
Output Voltages as Low as 400mV (VLDO Outputs)
Power Good Output
Input Voltage Range: 2.7V to 5.5V
Independent Internal Soft-Start for Each Supply
Independent Enable Pin for Each Supply
Low (140µA Typ) No-Load Quiescent Current with All Outputs Enabled
Constant Frequency Current Mode Operation
2.25MHz Switching Frequency Uses Small Inductors
Defeatable Automatic Burst Mode^® Operation for High Efficiency at Light Loads
±1.5% Reference Accuracy
Overtemperature Protection
Thermally Enhanced 4mm × 3mm 14-Pin DFN Package

Part Models: 4
1ku List Price: Starting From $3.31

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
LTC3446EDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3446EDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3446IDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3446IDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3446EDE#PBF	PRODUCTION
LTC3446EDE#TRPBF	PRODUCTION
LTC3446IDE#PBF	PRODUCTION
LTC3446IDE#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice 1

LTC3446 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC3446

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.

Evaluation Kits

LTC3446EDE Demo Board | 2.9V ≤ VIN ≤ 5.5V, VOUT1 = 1.8V @ 400mA, VOUT2/VOUT3 = 1.2V/1.5V @ 300mA

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Product Details

Demonstration circuit 893A is a triple output converter using the LTC3446 1A monolithic synchronous buck regulator with dual 300mA very low drop-out linear regulators (VLDOs). The DC893A has an input voltage range of 2.9V to 5.5V, and is capable of delivering up to 400mA of load current on the buck output and up to 300mA on each VLDO output. The buck regulator output voltage of the DC893A can be set as low as 0.8V, and the dual VLDOs can be set as low as 0.4V.

Resources

DC893A - Schematic
27.00K

DC893A - Demo Manual
167.00K

DC893A - Design File
546.00K

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