LTM4644 Replacement: GX4644 Pin-to-Pin Quad 4 A DC/DC Power Module
GX4644 is a quad-output DC/DC step-down power module designed as a direct alternative to LTM4644. The package integrates switching controllers, power FETs, inductors and supporting components, reducing the number of external power components required.
The device supports input voltages from 4 V to 14 V, or 2.375 V to 14 V with an external bias supply. Each channel delivers 4 A continuously and 5 A peak, while parallel operation supports output currents up to 16 A.
GX4644 as a Direct LTM4644 Replacement
GX4644 provides four independently configurable output channels covering voltages from 0.6 V to 5.5 V. The channels can also be connected in parallel for higher-current power rails.
For existing LTM4644-based products, GX4644 allows the original BGA footprint, voltage-setting network and power architecture to be retained. It is also suitable for new multirail FPGA, DSP and ASIC power designs.
Pin-to-Pin Hardware and Functional Compatibility with LTM4644
GX4644 is designed for pin-to-pin hardware and functional compatibility with LTM4644. Existing BGA-77 footprints, input and output connections, feedback networks, synchronization signals and protection circuits can be retained.
The device does not use a programmable digital interface or register-based software control. Replacing LTM4644 with GX4644 therefore requires no firmware or control-software modification.
This compatibility enables direct board-level replacement without redesigning the schematic or PCB.
GX4644 vs LTM4644: Key Specification Comparison
|
Specification |
LTM4644 |
GX4644 |
|
Device Type |
Quad DC/DC Power Module |
Quad DC/DC Power Module |
|
Output Channels |
4 |
4 |
|
Standard Input Voltage |
4–14 V |
4–14 V |
|
Input with External Bias |
2.375–14 V |
2.375–14 V |
|
Output Voltage Range |
0.6–5.5 V |
0.6–5.5 V |
|
Continuous Current per Channel |
4 A |
4 A |
|
Peak Current per Channel |
5 A |
5 A |
|
Maximum Parallel Output Current |
16 A |
16 A |
|
Total Output Voltage Regulation |
±1.5% |
±1.5% |
|
Default Switching Frequency |
1 MHz |
1 MHz |
|
External Synchronization Range |
700 kHz–1.3 MHz |
700 kHz–1.3 MHz |
|
Control Architecture |
Current Mode |
Current Mode |
|
Output Voltage Tracking |
Yes |
Yes |
|
External Frequency Synchronization |
Yes |
Yes |
|
Temperature Monitoring |
Internal Sensing Diode |
Internal Sensing Diode |
|
Main Protection Functions |
Overvoltage, Overcurrent and Thermal Protection |
Overvoltage/Undervoltage Monitoring, Foldback Overcurrent and Thermal Shutdown |
|
Package |
BGA-77, 9 mm × 15 mm × 5.01 mm |
BGA-77, 9 mm × 15 mm × 5.01 mm |
|
Pin-to-Pin Compatible |
— |
Yes |
|
Schematic or PCB Changes Required |
— |
No |
|
Firmware or Software Changes Required |
— |
No |
Multirail Power Regulation Features and Applications
Key GX4644 features include:
l Four independent buck regulator channels
l 4 A continuous and 5 A peak current per channel
l Up to 16 A through parallel channel operation
l 4 V to 14 V standard input range
l 2.375 V to 14 V input range with external bias
l 0.6 V to 5.5 V adjustable output range
l ±1.5% total output voltage regulation
l 1 MHz default switching frequency
l 700 kHz to 1.3 MHz external synchronization
l Output voltage tracking
l Overvoltage and undervoltage monitoring
l Foldback overcurrent protection
l Thermal shutdown
l Integrated switching controllers, power FETs and inductors
GX4644 is suitable for multirail point-of-load regulation and power supplies for FPGAs, DSPs, ASICs, communication equipment and industrial systems.
Supply and Technical Support
GXSC can provide samples, pin compatibility verification, thermal evaluation and application support for LTM4644 replacement projects and new multirail power designs.
Request GX4644 Datasheet and Samples
Contact GXSC to request the GX4644 datasheet, samples, quotation or technical support for your LTM4644 replacement or new power-system design.
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