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LTM4644EY#PBF

Quad 4A DC/DC uModule regulator, 4-14V in, 0.6-5.5V out, paralleable to 16A, BGA-77

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Manufacturer Part：

LTM4644EY#PBF

Package：

77-Lead BGA (9 x 15 x 5.01 mm, 1.9g)

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Description

Product Overview

The Analog Devices LTM4644EY#PBF is a quad DC/DC step-down uModule (micromodule) regulator with 4 A per output, configurable up to 16 A when paralleled. Packaged in a 77-lead BGA (9 x 15 x 5.01 mm), it integrates switching controllers, power FETs, inductors, and support components, requiring only external input and output capacitors for a complete quad-output power supply solution.

Key Specifications

Input Voltage Range 4 V to 14 V (2.375 V with external bias)
Output Voltage Range 0.6 V to 5.5 V
Output Current 4 A DC per channel (5 A peak)
Total Regulation Accuracy ±1.5%
Operating Temperature -40°C to +125°C
Package 77-Lead BGA (9 x 15 x 5.01 mm)

Features

  • Quad output step-down with 4 A per channel
  • Outputs paralleable for up to 16 A capability
  • Current mode control for fast transient response
  • Output voltage tracking and soft-start
  • Internal temperature sensing diode
  • External frequency synchronization
  • Overvoltage, overcurrent, and overtemperature protection

Applications

  • Multi-rail FPGA/DSP/ASIC point-of-load regulation
  • Telecom and networking equipment
  • Server and data center power supplies
  • Test and measurement instruments
  • Medical imaging systems

The LTM4644EY#PBF from Analog Devices is a quad output step-down DC/DC uModule regulator providing 4 A per channel with the ability to parallel outputs for up to 16 A total. The module integrates the switching controllers, power MOSFETs, inductors, and all support components in a compact 9 x 15 x 5.01 mm BGA package—only bulk input and output capacitors are needed to complete the design. Operating over an input range of 4 V to 14 V (down to 2.375 V with external bias), the device supports output voltages from 0.6 V to 5.5 V with ±1.5% total regulation accuracy. Current mode control ensures fast transient response and easy loop compensation.

Each of the four channels in the LTM4644EY operates as an independent current-mode buck converter. The internal controller generates PWM signals to drive the integrated high-side and low-side MOSFETs, stepping down the input voltage to the desired output level. The output voltage is set by an external resistor divider from VOUT to the FB pin (the LTM4644-1 variant integrates the top feedback resistor). Current mode control uses the inductor current as the inner loop variable, providing cycle-by-cycle current limiting and inherent input voltage feedforward for improved line regulation. The RUN pin controls each channel independently, while the TRACK/SS pin enables output voltage tracking and programmable soft-start. The CLKIN/CLKOUT pins allow multiple modules to synchronize their switching frequencies, preventing beat-frequency interference in noise-sensitive systems.

Pin Group Name Type Function
A1-A5 VOUT1 Power Output Channel 1 output voltage
B5 SVIN1 Power Channel 1 signal VIN
B6 MODE1 Config Channel 1 mode setting (CCM/BCM)
C5 RUN1 Input Channel 1 run control
D6 COMP1 Analog Channel 1 compensation
E5 INTVCC1 Power Channel 1 internal supply
G5-G7 FB1-FB4 Analog Input Feedback pins for channels 1-4
H5 SGND Ground Signal ground
K5 TEMP Analog Output Internal temperature diode output
L5 CLKIN Input External clock synchronization input
L7 VIN1-VIN4 Power Input Channel input voltage (4-14V)
  • Quad-rail FPGA core, I/O, and memory power (0.9V/1.0V/1.2V/1.5V)
  • Multi-rail DSP and ASIC point-of-load regulation
  • Telecom blade server distributed power architecture
  • Medical imaging system multi-voltage power supply
  • High-current (16A) single-rail supply using parallel configuration
Manufacturer Part Number Outputs Current Notes
ADI LTM4644IY#PBF 4 4 A/ch Industrial grade version
ADI LTM4650 2 25 A/ch Higher current, dual channel
TI TPS546D24A 1 40 A Single channel, higher current
ADI LTM4620 2 13 A/ch Dual higher-current uModule
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