LTM4644 - Quad DC/DC μModule Regulator with Configurable 4A Output Array


  • Quad Output Step-Down μModule® Regulator with 4A per Output
  • Wide Input Voltage Range: 4V to 14V
  • 2.375V to 14V with External Bias
  • 0.6V to 5.5V Output Voltage
  • 4A DC, 5A Peak Output Current Each Channel
  • Up to 5.5W Power Dissipation (TA = 60°C, 200 LFM, No Heat Sink)
  • ±1.5% Total Output Voltage Regulation
  • Current Mode Control, Fast Transient Response
  • Parallelable for Higher Output Current
  • Output Voltage Tracking
  • Internal Temperature Sensing Diode Output
  • External Frequency Synchronization
  • Overvoltage, Current and Temperature Protection
  • 9mm × 15mm × 5.01mm BGA Package

Typical Application

LTM4644 Typical Application
LTM4644 Typical Application


The LTM®4644 is a quad DC/DC step-down μModule (micromodule) regulator with 4A per output. Outputs can be paralleled in an array for up to 16A capability. Included in the package are the switching controllers, power FETs, inductors and support components. Operating over an input voltage range of 4V to 14V or 2.375V to 14V with an external bias supply, the LTM4644 supports an output voltage range of 0.6V to 5.5V each set by a single external resistor. Its high efficiency design delivers 4A continuous (5A peak) output current per channel. Only bulk input and output capacitors are needed.

Fault protection features include overvoltage, overcurrent and overtemperature protection. The LTM4644 is offered in 9mm ×15mm × 5.01mm BGA package. The LTM4644 is available with SnPb (BGA) or RoHS compliant terminal finish.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprint compatible with Mentor Graphics PADS® v9.5 or later, and Cadence ORCAD® v16.5 or later.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTM4644EY#PBF 15mm × 9mm × 5.01mm BGA BGA E 05-08-1900 RoHS
LTM4644IY 15mm × 9mm × 5.01mm BGA BGA I 05-08-1900 RoHS
LTM4644IY#PBF 15mm × 9mm × 5.01mm BGA BGA I 05-08-1900 RoHS

LTM4644 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Temp Price
LTM4644EY#PBF 15mm × 9mm × 5.01mm BGA E $32.64 $22.85 View
LTM4644IY 15mm × 9mm × 5.01mm BGA I $44.70 $31.30 View
LTM4644IY#PBF 15mm × 9mm × 5.01mm BGA I $35.91 $25.14 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1900A LTM4644 Demo Board | Quad Buck µModule Regulator, 4V ≤ VIN ≤ 14V, Vout1 - Vout4 = 3.3V/2.5V/1.5V/1.2V @ 4A Each $65.00
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  • Multirail Point of Load Regulation
  • FPGAs, DSPs and ASICs Applications

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