LTC3633A-2
LTC3633A-3

PRODUCTION

Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator

Part Models: 16
1ku List Price: Starting From $5.07

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Overview

3.6V to 20V Input Voltage Range
3A Output Current per Channel
Up to 95% Efficiency
Low Duty Cycle Operation: 5% at 2.25MHz
Selectable 0°/180° Phase Shift Between Channels
Adjustable Switching Frequency: 500kHz to 4MHz
External Frequency Synchronization
Current Mode Operation for Excellent Line and Load Transient Response

0.6V Reference Allows Low Output Voltages
User Selectable Burst Mode^® Operation or Forced Continuous Operation
Output Voltage Tracking and Soft-Start Capability
Short-Circuit Protected
Overvoltage Input and Overtemperature Protection
Power Good Status Outputs
Available in (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages

The LTC3633A-2 is a high efficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time, current mode architecture, with phase lockable switching frequency. The two channels can run 180° out of phase to relax the requirements for input and output capacitance. The operating supply voltage range is from 3.6V to 20V, making it suitable for lithium-ion battery stacks as well as point of load power supply applications from a 12V or 5V supply.

The operating frequency is programmable from 500kHz to 4MHz with an external resistor and may be synchronized to an external clock signal. The high frequency capability allows the use of small surface mount inductors and capacitors. The unique constant frequency/controlled on-time architecture is ideal for high step-down ratio applications that operate at high frequency while demanding fast transient response. An internal phase locked loop servos the on-time of the internal one-shot timer to match the frequency of the internal clock or an applied external clock.

The LTC3633A-2 can select between forced continuous mode and high efficiency Burst Mode operation. The LTC3633A-2 and LTC3633A-3 differ in their output voltage sense range (refer to Table 1 in the Operation section of the datasheet for a description of the entire LTC3633A product family).


Part Number	Output Voltage Sense Range	SVin Input	V2P5 Output	LTC3633 Pin Compatible
LTC3633A	0.6V TO 6V	No	Yes	Yes
LTC3633A-1	1.5V TO 12V	No	Yes	Yes
LTC3633A-2	0.6V TO 6V	Yes	No	No
LTC3633A-3	1.5V TO 12V	Yes	No	No

Applications

Distributed Power Systems
Battery Powered Instruments
Point of Load Power Supplies

Part Models: 16
1ku List Price: Starting From $5.07

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
LTC3633AEFE-2#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AEFE-2#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AEFE-3#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AEFE-3#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AEUFD-2#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AEUFD-2#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AEUFD-3#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AEUFD-3#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AIFE-2#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AIFE-2#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AIFE-3#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AIFE-3#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AIUFD-2#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AIUFD-2#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AIUFD-3#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3633AIUFD-3#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
LTC3633AEFE-2#PBF	PRODUCTION
LTC3633AEFE-2#TRPBF	PRODUCTION
LTC3633AEFE-3#PBF	PRODUCTION
LTC3633AEFE-3#TRPBF	PRODUCTION
LTC3633AIFE-2#PBF	PRODUCTION
LTC3633AIFE-2#TRPBF	PRODUCTION
LTC3633AIFE-3#PBF	PRODUCTION
LTC3633AIFE-3#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
Power System Management (PSM) & Sequencers 1
LTC2977	RECOMMENDED FOR NEW DESIGNS	8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement
Switching Regulators & Controllers 1
LTC3633A LTC3633A-1		Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC3633
LTC3633A
LTC3633A-1
LTC3633A-2
LTC3633A-3

LTpowerCAD 1

LTC3633A-3 Project - Dual 20V 3A, Monolithic Buck Regulato (3.6-20V to 1.5V & 2.5V @3A)

Design tools for the following parts are available in LTpowerCAD:

LTC3633
LTC3633-2
LTC3633A
LTC3633A-1
LTC3633A-3

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

LTC3633AEFE-3 Demo Board I 3.6V to 20V Input, 3.3V at 3A and 1.8V at 3A Output

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Product Details

Demonstration circuit DC1896 is a dual output regulator consisting of two constant-frequency step-down converters, based on the LTC3633A-3 monolithic dual channel synchronous buck regulator. The DC1896 has an input voltage range of 3.6V to 20V, with each regulator capable of delivering up to 3A of output current. The DC1896 can operate in either Burst ModeÔ or forced continuous mode. In shutdown, the DC1896 can run off of less than 15 uA total. The DC1896 is a very efficient circuit: up to 90%.

Resources

DC1896A - Demo Manual
6/11/2013

DC1896A - Design Files
6/11/2013

DC1896A - Schematic
6/11/2013

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