LTC3728L/LX
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LTC3728L/LX

Dual, 550kHz, 2-Phase Synchronous Regulators

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LTspice LTC3728L - Step-Down (Buck) Regulators Download 6.13 KB
Part Models 17
1ku List Price Starting From $5.18
Features
  • Dual, 180° Phased Controllers Reduce Required
    Input Capacitance and Power Supply Induced Noise
  • OPTI-LOOP® Compensation Minimizes COUT
  • ±1% Output Voltage Accuracy (LTC3728LC)
  • Power Good Output Voltage Indicator
  • Phase-Lockable Fixed Frequency 250kHz to 550kHz
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4.5V to 28V Operation
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Soft-Start Current Ramping
  • Foldback Output Current Limiting
  • Latched Short-Circuit Shutdown with Defeat Option
  • Output Overvoltage Protection
  • Low Shutdown IQ: 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
Additional Details
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The LTC3728L/LTC3728LX are dual high performance step-down switching regulator controllers that drive 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.

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) input supply range encompasses all battery chemistries.

A RUN/SS pin for each controller provides both soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when overcurrent latchoff is disabled. Output overvoltage protection circuitry latches on the bottom MOSFET until VOUT returns to normal. The FCB mode pin can select among Burst Mode, constant-frequency mode and continuous inductor current mode or regulate a secondary winding. The LTC3728L/LTC3728LX include a power good output pin that indicates when both outputs are within 7.5% of their designed set point.

Vin Range Vref 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

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LTspice LTC3728L - Step-Down (Buck) Regulators Download 6.13 KB
Part Models 17
1ku List Price Starting From $5.18
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LTC3728L/LX

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Data Sheet

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UPDATED 12/08/2011
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LTC3728L: Dual, 550kHz, 2-Phase Synchronous Regulators Data Sheet

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UPDATED 05/25/2012
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LTC3728L: デュアル、550kHz、2フェーズ、同期整流式レギュレータ データシート

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Design Note

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UPDATED 08/21/2007
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Design Solutions 10 - Active Voltage Positioning Reduces Output Capacitors redirect icon

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UPDATED 08/21/2007
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Design Solutions 43 - High Performance Switch Mode Power Solutions for Altera Low Voltage FPGAs redirect icon

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User Guide

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UPDATED 09/24/2009
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DC898A - Demo Manual redirect icon

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DC899A - Demo Manual redirect icon

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DC392A - Demo Manual redirect icon

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R384 Reliability Data redirect icon

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Documentation

Technical Documents 7
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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
LTC3728LCGN#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3728LCGN#TRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3728LCUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3728LCUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3728LEGN#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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LTC3728LEGN#TRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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LTC3728LEUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LTC3728LEUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3728LIGN#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3728LIGN#TRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3728LIUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3728LIUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3728LIUH-1#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3728LXCUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3728LXCUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3728LZEUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3728LZEUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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LTC3728LCGN#TRPBF

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Dual, 2-Phase Synchronous Step-Down Switching Controller

Evaluation Kits 4

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DC392A-C

LTC3728LEUH Demo Board | Dual Output, 5V to 24VIN, 5VOUT1 @ 4A, 3.3VOUT2 @ 5A

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DC392A-C

LTC3728LEUH Demo Board | Dual Output, 5V to 24VIN, 5VOUT1 @ 4A, 3.3VOUT2 @ 5A

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DC392A-C
LTC3728LEUH Demo Board | Dual Output, 5V to 24VIN, 5VOUT1 @ 4A, 3.3VOUT2 @ 5A
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Product Detail

Demonstration circuit 392 is a dual output, step-down, synchronous buck converter featuring either the 150kHz to 300kHz LTC1628EUH controller (DC392A-A), the 250kHz to 550kHz LTC3728EUH (DC392A-B) or 250kHz to 550kHz LTC3728LUH (DC392A-C). It operates with an input voltage range of 7V to 24V and provides 3.3V @ 5A and 5V @ 4A at its output. The LTC3728L has a lower maximum input voltage than the LTC3728 (28V vs. 36V) and thus is more cost effective.

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DC392A - Schematic Download

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DC392A - Design File Download

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DC392A - Demo Manual Download

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DC899A

LTC3728LXCUH Demo Board | 2-Phase, 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2.5V @ 5A, VOUT2 = 3.3V @ 5A

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DC899A

LTC3728LXCUH Demo Board | 2-Phase, 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2.5V @ 5A, VOUT2 = 3.3V @ 5A

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DC899A
LTC3728LXCUH Demo Board | 2-Phase, 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2.5V @ 5A, VOUT2 = 3.3V @ 5A
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Product Detail

Demonstration circuit 899 is a high efficiency supply featuring the dual-output, 2-phase synchronous buck regulator LTC3728LX (not tested cold and 1.5% accurate VREF). The input voltage range of the demo board is from 4.5V to 13.2V, though the LTC3728LX controller can take up to 30V (max) Vin. The outputs are 2.5V@5A and 3.3V@5A.

Resources

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DC899A - Schematic Download

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DC899A - Demo Manual Download

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DC899A - Design File Download

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DC898A-A

LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2V @ 10A, VOUT2 = 1.8V @ 10A

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DC898A-A

LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2V @ 10A, VOUT2 = 1.8V @ 10A

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DC898A-A
LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2V @ 10A, VOUT2 = 1.8V @ 10A
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Product Detail

Demonstration circuit 898 is a high current density supply featuring the dual-output, 2-phase synchronous buck regulator LTC3728L. The input voltage of the demo board is designed from 4.5V to 13.2V, though the LTC3728L controller can take up to 30V (max) VIN. There are two assemblies of the demo board, DC898A-A and DC898A-B. DC898A-A is a cost effective design with 2.0V/10A and 1.8V/10A outputs. DC898A-B is a high current design with 1.5V/15A and 1.2V/15A outputs.

Resources

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ZIP

DC898A - Design File Download

871.00K

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PDF

DC898A - Demo Manual Download

259.00K

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DC898A - Schematic Download

117.00K

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DC898A-B

LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 1.5V @ 15A , VOUT2 = 1.2V @ 15A

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DC898A-B

LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 1.5V @ 15A , VOUT2 = 1.2V @ 15A

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DC898A-B
LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 1.5V @ 15A , VOUT2 = 1.2V @ 15A
Buy Now View Details

Product Detail

Demonstration circuit 898 is a high current density supply featuring the dual-output, 2-phase synchronous buck regulator LTC3728L. The input voltage of the demo board is designed from 4.5V to 13.2V, though the LTC3728L controller can take up to 30V (max) VIN. There are two assemblies of the demo board, DC898A-A and DC898A-B. DC898A-A is a cost effective design with 2.0V/10A and 1.8V/10A outputs. DC898A-B is a high current design with 1.5V/15A and 1.2V/15A outputs.

Resources

pdf icon

ZIP

DC898A - Design File Download

871.00K

pdf icon

PDF

DC898A - Demo Manual Download

259.00K

pdf icon

PDF

DC898A - Schematic Download

117.00K

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Evaluation Kits4

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DC392A-C

LTC3728LEUH Demo Board | Dual Output, 5V to 24VIN, 5VOUT1 @ 4A, 3.3VOUT2 @ 5A
evaluation kit item images

DC899A

LTC3728LXCUH Demo Board | 2-Phase, 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2.5V @ 5A, VOUT2 = 3.3V @ 5A
evaluation kit item images

DC898A-A

LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2V @ 10A, VOUT2 = 1.8V @ 10A
evaluation kit item images

DC898A-B

LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 1.5V @ 15A , VOUT2 = 1.2V @ 15A

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LTC3728L - Step-Down (Buck) Regulators Download

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