LTC3728L/LX

PRODUCTION

Dual, 550kHz, 2-Phase Synchronous Regulators

Part Models
17
1ku List Price
Starting From $5.18
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Part Details

  • 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
LTC3728L/LX
Dual, 550kHz, 2-Phase Synchronous Regulators
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter Product Package 1 Product Package 2
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Documentation

Data Sheet

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

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Software Resources

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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
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Tools & Simulations

LTspice


Models for the following parts are available in LTspice:

  • LTC3728
  • LTC3728L
LTspice

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

eval board
DC392A-C

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

Product Details

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.

eval board
DC899A

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

Product Details

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.

eval board
DC898A-A

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

Product Details

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.

eval board
DC898A-B

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

Product Details

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.

DC392A-C
LTC3728LEUH Demo Board | Dual Output, 5V to 24VIN, 5VOUT1 @ 4A, 3.3VOUT2 @ 5A
DC392A-C - Schematic
DC899A
LTC3728LXCUH Demo Board | 2-Phase, 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2.5V @ 5A, VOUT2 = 3.3V @ 5A
DC899A - Schematic
DC898A-A
LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 2V @ 10A, VOUT2 = 1.8V @ 10A
DC898A-A - Schematic
DC898A-B
LTC3728LCUH Demo Board | 4.5V ≤ VIN ≤ 13.2V, VOUT1 = 1.5V @ 15A , VOUT2 = 1.2V @ 15A
DC898A-A - Schematic

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