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LT3507EUHF#TRPBF

Triple buck (2.4A+1.5A+1.5A) + LDO, 4-36V input, 250kHz-2.5MHz, 38-QFN 5x7mm

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Manufacturer Part：

LT3507EUHF#TRPBF

Package：

38-lead QFN (5.0 x 7.0 x 0.9mm, exposed pad)

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Description

Product Overview

The LT3507EUHF#TRPBF is a triple monolithic step-down DC/DC regulator with an integrated LDO from Analog Devices (formerly Linear Technology). It provides one 2.4A and two 1.5A buck regulators plus an LDO, all from a 4V to 36V input range. Packaged in a 38-lead QFN (5x7mm) with thermal enhancement, it features independent run, tracking/soft-start, and power good for each channel.

Key Specifications

Topology 3x Buck + 1x LDO
Input Voltage 4V to 36V
Output 1 0.8V-32.4V, 2.4A
Output 2 0.8V-32.4V, 1.5A
Output 3 0.8V-32.4V, 1.5A
Output 4 (LDO) External NPN, up to 0.5A
Switching Frequency 250kHz to 2.5MHz (programmable)
Package 38-lead QFN (5x7mm w/ EP)
Operating Temperature -40 to +125C
Sequencer Integrated

Features

  • Triple buck + LDO in a single 5x7mm QFN
  • Independent VIN pins for each buck channel
  • Antiphase switching reduces input ripple
  • Independent run, tracking/soft-start, PGOOD
  • Programmable 250kHz-2.5MHz switching frequency
  • External clock synchronization
  • Overvoltage and undervoltage lockout
  • Frequency foldback during overload

Applications

  • DSP and FPGA multi-rail power
  • DSL and cable modem power supplies
  • Automotive multi-rail systems
  • Distributed power regulation
  • Industrial control power supplies

The LT3507EUHF#TRPBF is a highly integrated quad-output power management IC from Analog Devices combining three monolithic step-down switching regulators (2.4A + 1.5A + 1.5A) and a low-dropout linear regulator with external NPN pass transistor. With a wide 4V to 36V input range and independent input supply pins for each buck channel, the device provides flexible multi-rail power supply solutions. The integrated sequencer, independent run/PGOOD/tracking pins, and antiphase switching architecture make it ideal for complex DSP, FPGA, and multi-processor power systems.

The LT3507 uses a current-mode constant-frequency architecture for each of the three buck regulators. Channel 1 operates 180 degrees out of phase with channels 2 and 3, reducing input current ripple and allowing smaller input capacitors. Each channel has its own VIN pin for maximum efficiency when operating from different supply rails. The LDO uses an external NPN transistor with internal base drive up to 10mA. The tracking/soft-start (TRK/SS) pins enable both soft-start (via capacitor) and ratiometric/coincident output tracking for power sequencing. Each channel provides a power good (PGOOD) signal when its output is in regulation.

Pin Group Type Function
VIN1, VIN2, VIN3 Power Independent input supplies (4-36V)
SW1, SW2, SW3 Output Switch outputs
FB1, FB2, FB3 Input Feedback pins (0.8V reference)
RUN1, RUN2, RUN3 Input Run control for each channel
PGOOD1,2,3 Output Power good indicators
TRK/SS1,2,3,4 I/O Track/Soft-start pins
BIAS, DRIVE, BASE I/O LDO control pins
RT/SYNC Input Frequency program / sync
  • DSP multi-core power supply (core, I/O, memory)
  • FPGA multi-rail power systems
  • Automotive infotainment power management
  • DSL/cable modem multi-voltage supply
  • Industrial PLC multi-rail regulation
Manufacturer Part Number Package Notes
ADI LT3507AEUHF#TRPBF 38-QFN Higher current 2.7A+1.8A+1.8A
TI TPS65218B0RSLR VQFN-56 Quad PMIC for processors
Richtek RT5081AGQW WQFN-40L Quad PMIC alternative
Monolithic Power MP8867S-0000 QFN-28 Quad output PMIC
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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