LINEAR TECHNOLOGY LTM4604 User Guide Specifications and Instructions for Use
Summary
The LTM4604 is a high-efficiency, standalone 4A DC/DC µModule designed for compact power delivery in demanding applications. It supports wide input voltage ranges (2.375V–5.5V) and features output tracking from 0.8V to 5V with ultra-fast transient response. This manual provides detailed specifications on its electrical characteristics, protection modes, and integration guidelines. It is ideal for engineers designing networking gear, telecom equipment, servers, and industrial devices requiring reliable, high-density power solutions.
Page 1 Text Content
LTM4604
Low Voltage, 4A DC/DC µModule TM with Tracking
FEATURES DESCRIPTION ■ Complete Standalone Power Supply
The LTM®4604 is a complete 4A switch mode DC/DC power
■ Wide Input Voltage Range: 2.375V to 5.5V
supply. Included in the package are the switching control-
■ 4A DC, 5A Peak Output Current
ler, power FETs, inductor and all support components.
■ 0.8V to 5V Output
Operating over an input voltage range of 2.375V to 5.5V,
■ Output Voltage Tracking
the LTM4604 supports an output voltage range of 0.8V
■ ±2% Total DC Error
to 5V, set by a single resistor. This high effi ciency design
■ Ultra Fast TM Transient Response
delivers up to 4A continuous current (5A peak). Only bulk
■ Power Good Indicator
output capacitors are needed to complete the design.
■ Current Mode Control
The low profi le package (2.3mm) enables utilization of
■ Current Foldback Protection, Parallel/Current Sharing
unused space on the bottom of PC boards for high density
■ Up to 95% Effi ciency
point of load regulation. High switching frequency and
■ Programmable Soft-Start
a current mode architecture enable a very fast transient
■ Micropower Shutdown: IQ ≤ 7μA
response to line and load changes without sacrifi cing
■ Overtemperature Protection EF FI CI EN CY
stability. The device supports output voltage tracking for
■ Small and Very Low Profi le Package:
supply rail sequencing.
15mm × 9mm × 2.3mm LGA
Fault protection features include foldback current protec- APPLICATIONS tion, thermal shutdown and a programmable soft-start function. The LTM4604 is offered in a space saving and
■ Telecom and Networking Equipment
thermally enhanced 15mm × 9mm × 2.3mm LGA package
■ Servers
and is Pb free and Ro HS compliant.
■ Storage Cards
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
■ ATCA Cards
μModule and Ultra Fast are trademarks of Linear Technology Corporation. ■ Industrial Equipment All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Effi ciency vs Output Current
3.3V to 2.5V/4A μModule Regulator
VIN = 3.3V
VIN VOUT = 2.5V 3.3V
VOUT PGOOD VOUT 2.5V 4A
LTM4604
COMP FB
RUN/SS TRACK VIN
4604 TA01a
OUTPUT CURRENT (A)
Page Summary Contents For LINEAR TECHNOLOGY LTM4604 User Guide Specifications and Instructions for Use
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 314.28 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What is the input voltage range for the LTM4604 regulator?
It operates over an input voltage range of 2.375V to 5.5V.
How does the device manage changes in load current?
It provides UltraFast Transient Response and includes Current Foldback Protection, allowing it to deliver up to 4A continuous (5A peak) current.
Is output voltage tracking supported by this module?
Yes, the LTM4604 supports output voltage tracking for supply rail sequencing.
What are the operating temperature limits and features?
The device operates from –40°C to 85°C and includes Overtemperature Protection, thermal shutdown, and programmabe soft-start functionality.