LTM4632 - Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory


  • Complete DDR-QDR4 SRAM Power Solution Including VDDQ, VTT, VTTR (or VREF)
  • Solution in 0.5cm2 (Dual-Sided PCB)
  • Wide Input Voltage Range: 3.6V to 15V
  • 3.3V Input Compatible with VIN Tied to INTVCC
  • 0.6V to 2.5V Output Voltage Range
  • Dual ±3A DC Output Current with Sink and Source Capability
  • ±1.5%, ±10mA Buffered VTTR = VDDQ/2 Output
  • 3A VDDQ + 3A VTT or Dual Phase Single 6A VTT
  • ±1.5% Maximum Total Output Voltage Regulation Error Over Load, Line and Temperature
  • Current Mode Control, Fast Transient Response
  • External Frequency Synchronization
  • Multiphase Parallelable with Current Sharing
  • Selectable Burst Mode® Operation
  • Overvoltage Input and Overtemperature Protection
  • Power Good Indicator
  • Ultrathin 6.25mm × 6.25mm × 1.82mm LGA and 6.25mm × 6.25mm × 2.42mm BGA Packages

Typical Application

LTM4632 Typical Application
LTM4632 Typical Application


The LTM®4632 is an ultrathin triple output step-down μModule® (power module) regulator to provide complete power solution for DDR-QDR4 SRAM. Operating from a 3.6V to 15V input voltage, the LTM4632 supports two ±3A output rails, both sink and source capable, for VDDQ and VTT, plus a 10mA low noise reference VTTR output. Both VTT and VTTR track and are equal to VDDQ/2. Housed in a 6.25mm × 6.25mm × 1.82mm LGA and 6.25mm × 6.25mm × 2.42mm BGA packages, the LTM4632 includes the switching controller, power FETs, inductors and support components. Alternatively, the power module can also be configured as a two phase single ±6A output VTT. Only a few ceramic input and output capacitors are needed to complete the design.

The LTM4632 supports selectable Burst Mode operation (CH1 only) and output voltage tracking for supply rail sequencing. Its high switching frequency and current mode control enable a very fast transient response to line and load changes without sacrificing stability.

Fault protection features include overvoltage input, overcurrent and overtemperature protection.

The LTM4632 is RoHS compliant with Pb-free finish.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
LTM4632EV#PBF 6.25mm x 6.25mm x 1.82mm LGA LGA E 05-08-1949 Yes
LTM4632EY#PBF 6.25mm x 6.25mm x 2.42mm BGA BGA E 05-08-1502 Yes
LTM4632IV#PBF 6.25mm x 6.25mm x 1.82mm LGA LGA I 05-08-1949 Yes
LTM4632IY 6.25mm x 6.25mm x 2.42mm BGA BGA I 05-08-1502 No
LTM4632IY#PBF 6.25mm x 6.25mm x 2.42mm BGA BGA I 05-08-1502 Yes

LTM4632 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTM4632EV#PBF 6.25mm x 6.25mm x 1.82mm LGA E $10.50 $7.35 Yes
LTM4632EY#PBF 6.25mm x 6.25mm x 2.42mm BGA E $11.02 $7.71 Yes
LTM4632IV#PBF 6.25mm x 6.25mm x 1.82mm LGA I $11.56 $8.09 Yes
LTM4632IY 6.25mm x 6.25mm x 2.42mm BGA I $15.43 $10.80 No
LTM4632IY#PBF 6.25mm x 6.25mm x 2.42mm BGA I $12.07 $8.45 Yes
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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
DC2367A LTM4632 Demo Board | Ultrathin Triple Output Buck μModule Regulator for DDR-QDR4 Memory, 3.6V ≤ VIN ≤ 15V, ±3A VDDQ/VTT, 10mA VREF $65.00
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Click here to view our complete list of demo boards


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Design Tools


LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

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