LT3504

PRODUCTION

Quad 40V/1A Step-Down Switching Regulator with 100% Duty Cycle Operation

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Overview

  • Wide Input Range: 3.2V to 40V
  • Four 1A Outputs
  • 100% Duty Cycle Operation
  • Resistor-Programmed Constant Frequency
  • Short-Circuit Robust
  • Wide SYNC Range: 350kHz to 2.2MHz
  • Anti-Phase Switching Reduces Ripple
  • 800mV FB Voltage
  • Independent Run/Soft-Start Pins
  • Shutdown with UVLO
  • Internal Compensation
  • Thermal Shutdown
  • Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package

The LT3504 consists of four 1A output current buck regulators. The LT3504 has a wide operating input range of 3.2V to 40V. An on-chip boost regulator allows each channel to operate up to 100% duty cycle and eliminates the need for four external charge pump circuits. The LT3504 is designed to minimize external component count and results in a simple and small application circuit.

The LT3504 operates robustly in fault conditions. Cycle-by-cycle peak current limit and catch diode current limit sensing protect the part during overload conditions. Thermal shutdown protects the power switches at elevated temperatures. Soft-start helps keep the peak inductor current under control during startup.

The LT3504 also features output voltage tracking and sequencing, programmable frequency, programmable undervoltage lockout, and a power good pin to indicate when all outputs are in regulation.

Applications

  • Automotive Battery Regulation
  • Industrial Control Supplies
  • Wall Transformer Regulation
  • Distributed Supply Regulation
LT3504
Quad 40V/1A Step-Down Switching Regulator with 100% Duty Cycle Operation
Quad Buck Regulator in 4 × 5 QFN LT3504 Start-Up and Shutdown Waveform. VIN (Top Trace) Is Ramped from 0V Up to 8V and Then Back Down to 0V. The Other Four Traces Are the Output Voltages of All Four Channels Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

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
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3504
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
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC1207A

LT3504 Demo Board | Quad Buck, 5.4V ≤ VIN ≤ 40V, VOUT1 - VOUT4 = 5V/3.3V/2.5V/1.8V at 1A Each

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Product Details

The demo circuit 1207A is a quad current mode PWM stepdown DC/DC converter featuring the LT3504. The demo circuit is designed for 5V, 3.3V, 2.5V and 1.8V outputs from a 5.4V to 40V input. The current capability of each channel is up to 1A. Individual soft-start and current limit for each output as well as synchronous function simplify the complex design of quad-output power converters.


Each converter is synchronized to either a common external clock input or a resistor programmable 250kHz to 2.2MHz internal oscillator. Programmable frequency allows optimization between efficiency and external component size. Each output can be independently disabled using its own RUN/SS pin.
DC1207A
LT3504 Demo Board | Quad Buck, 5.4V ≤ VIN ≤ 40V, VOUT1 - VOUT4 = 5V/3.3V/2.5V/1.8V at 1A Each
DC1207A Demo Board DC1207A Demo Board DC1207A Demo Board DC1207A Demo Board DC1207A - Schematic

Latest Discussions

3 Years Ago
LT3504 will burn the chip when tested at 85℃.
4 Years Ago
Lt3504 Output Combination
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