LTC3728L-1

PRODUCTION

Dual, 550kHz, 2-Phase Synchronous Regulator

Part Models: 7
1ku List Price: Starting From $5.54

Viewing:

Part Details

Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
OPTI-LOOP^® Compensation Minimizes C_OUT
±1.5% Output Voltage Accuracy
Power Good Output Voltage Indicator
Phase-Lockable Fixed Frequency 250kHz to 550kHz
Over Current Latch-off Disabled
Wide V_IN Range: 4.5V to 28V (35V for LTC3728LI-1) Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Output Overvoltage Protection
Low Shutdown I_Q: 20μA
5V and 3.3V Standby Regulators
3 Selectable Operating Modes: Constant Frequency, Burst Mode^® Operation and PWM
5mm × 5mm QFN and 28-Lead Narrow SSOP Packages

The LTC3728L-1 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows phase-lockable frequency of up to 550kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase. The LTC3728L-1 is identical to the LTC3728L except that the LTC3728L-1 lacks the over current latch-off feature.

OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with future microprocessor generations, and a wide 4.5V to 28V (30V maximum/35V for LTC3728LI-1) input supply range encompasses all battery chemistries.

A RUN/SS pin for each controller provides soft-start. Current foldback limits MOSFET dissipation during shortcircuit conditions. The FCB mode pin can select among Burst Mode operation, constant frequency mode and continuous inductor current mode or regulate a secondary winding. The LTC3728L-1 includes a power good output pin that indicates when both outputs are within 7.5% of their designed set point.


	V_IN Range	V_REF Accy	Current Limit Latch Off	3.3V LDO Available
LTC3728	3.5V to 36V	±1%	Yes
LTC3728L	4.5V to 28V	±1%	Yes	Yes
LTC3728LX	4.5V to 28V	±1.5%	Yes	Yes
LTC3728L-1	4.5V to 28V	±1.5%	Foldback only	Yes

Applications

Notebook and Palmtop Computers
Telecom Systems
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems

Part Models: 7
1ku List Price: Starting From $5.54

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
LTC3728LEGN-1#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3728LEGN-1#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3728LEUH-1#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3728LEUH-1#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3728LIGN-1#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3728LIGN-1#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3728LIUH-1#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC3728LEGN-1#PBF	PRODUCTION
LTC3728LEGN-1#TRPBF	PRODUCTION
LTC3728LIGN-1#PBF	PRODUCTION
LTC3728LIGN-1#TRPBF	PRODUCTION
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3728LEUH-1#PBF	PRODUCTION
LTC3728LEUH-1#TRPBF	PRODUCTION
LTC3728LIUH-1#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Silicon Oscillators 2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

Parts	Product Life Cycle	Description
LTC3850	PRODUCTION	Dual, 2-Phase Synchronous Step-Down Switching Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3728
LTC3728L

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.

Latest Discussions

No discussions on ltc3728l-1 yet. Have something to say?

Start a Discussion on EngineerZone®

Part Details

Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Hardware Ecosystem

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

Latest Discussions

Recently Viewed