LTM4643IY#PBF - Quad 3A μModule Regulator | Analog Devices
MPN: LTM4643IY#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $22.1 | $221.00 |
| 100 | $19.8 | $1,980.00 |
| 500 | $17.5 | $8,750.00 |
| 1,000 | $15.9 | $15,900.00 |
LTM4643IY#PBF Overview
A µModule regulator is a complete system-in-package (SiP) power management solution that combines a DC-DC controller, power transistors, inductors, and compensation circuitry into a single surface-mount package. This integration eliminates the need for external inductor selection and layout optimization, reducing design risk and time-to-market. The LTM4643 belongs to the µModule regulator family, which is part of the broader DC-DC converter category within power management ICs.
Key features include an input voltage range of 4V to 20V (or 2.375V to 20V with an external bias supply), four independent outputs each adjustable from 0.6V to 3.3V, and a high-efficiency synchronous step-down architecture. The module supports output voltage tracking, remote sense, and parallel operation for higher current. Its ultrathin profile (1.82mm) enables low-profile designs for space-constrained applications.
Technically, the LTM4643 uses a current-mode control architecture with internal compensation, ensuring stable operation across a wide range of output capacitors. The integrated inductors and power FETs are optimized for efficiency and thermal performance. The module includes overcurrent and overtemperature protection, enhancing system reliability. The LGA package provides excellent thermal dissipation through its exposed pad, allowing operation at full load without additional heatsinking in many applications.
Typical applications include FPGA, ASIC, and DSP core power supplies, where multiple low-voltage rails are required. The LTM4643 is also ideal for telecom, networking, and industrial systems that demand high-density, high-efficiency power conversion. Its ability to parallel outputs makes it suitable for high-current rails up to 12A.
When designing with the LTM4643, ensure adequate input and output capacitance as specified in the datasheet. The module's internal compensation simplifies design, but proper PCB layout with a solid ground plane and thermal vias is essential for optimal thermal and electrical performance.
Drop-in alternatives for LTM4643IY#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTM4643IY#PBF (same form factor and footprint) — differing in Input Voltage Range, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTM4643EY#PBF
✅ Drop-In✓ In Stock
$20.37 / Unit
View Datasheet →LTM4643MPV#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4644IY#PBF
⚡ Same Package ⚠️ Specs Unverified✓ In Stock
$20 / Unit
View Datasheet →LTM4645IY#PBF
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTM4620AIY#PBF
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTM4643IY#PBF Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable |
| Number of Outputs | 4 |
| Output Voltage Range | 0.6 V to 3.3 V |
| Output Current per Output | 3 A |
| Maximum Output Current (Parallel) | 12 A |
| Input Voltage Range | 4 V to 20 V |
| Input Voltage Range (with Bias) | 2.375 V to 20 V |
| Package | LGA (16mm x 16mm x 1.82mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +125C |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| Features | Remote Sense, Output Tracking, Parallel Operation |
LTM4643IY#PBF Pin Configuration
| Pin 1 | VIN — Input voltage supply |
| Pin 2 | VOUT1 — Output 1 |
| Pin 3 | VOUT2 — Output 2 |
| Pin 4 | VOUT3 — Output 3 |
| Pin 5 | VOUT4 — Output 4 |
| Pin 6 | GND — Ground |
| Pin 7 | RUN1 — Enable for output 1 |
| Pin 8 | RUN2 — Enable for output 2 |
| Pin 9 | RUN3 — Enable for output 3 |
| Pin 10 | RUN4 — Enable for output 4 |
| Pin 11 | PGOOD — Power good indicator |
| Pin 12 | TRACK — Output tracking control |
Typical Applications
LTM4643IY#PBF is suitable for 6 applications: FPGA Core Power Supply, ASIC/DSP Power, Telecom and Networking Equipment, Industrial Automation, Medical Imaging Systems, Data Center and Server Power.
FPGA Core Power Supply
The LTM4643IY#PBF provides four independent 3A rails, ideal for powering FPGA core, I/O, and auxiliary voltages. Its wide input range (4V-20V) accommodates various intermediate bus voltages, and the integrated inductors simplify layout. The module's high efficiency reduces thermal stress in dense FPGA designs, while parallel outputs can deliver up to 12A for high-current cores. The adjustable output range (0.6V-3.3V) matches FPGA core voltages, and remote sense ensures accurate regulation at the point of load.
Recommended
ASIC/DSP Power
ASICs and DSPs often require multiple low-voltage, high-current rails. The LTM4643IY#PBF's four 3A outputs can be paralleled to provide up to 12A for a single rail, or used independently for different voltage domains. Its integrated inductors and FETs reduce component count and design complexity, while the compact LGA package saves board space. The module's high efficiency minimizes power loss, and its thermal performance supports reliable operation in demanding computing environments.
Recommended
Telecom and Networking Equipment
In telecom and networking systems, the LTM4643IY#PBF powers line cards, switches, and routers. Its 4V-20V input range suits standard telecom voltages, and the four outputs can supply different logic levels. The module's high reliability and wide temperature range (-40C to +125C) make it suitable for outdoor and industrial environments. The integrated design reduces EMI and simplifies compliance testing, while the small footprint allows high-density board layouts.
Recommended
Industrial Automation
Industrial automation systems require robust power supplies that can handle wide input variations and harsh conditions. The LTM4643IY#PBF operates from 4V to 20V, covering common industrial bus voltages. Its four outputs can power sensors, actuators, and controllers with different voltage requirements. The module's overcurrent and overtemperature protection enhance system safety, and its compact size allows integration into space-constrained control cabinets.
Recommended
Medical Imaging Systems
Medical imaging equipment such as ultrasound and MRI systems require clean, reliable power for sensitive electronics. The LTM4643IY#PBF's low output noise and high PSRR ensure minimal interference with analog signal chains. Its multiple outputs can power FPGAs, ADCs, and display drivers. The module's small size and high efficiency are beneficial in portable and space-limited medical devices, while its wide temperature range supports reliable operation in clinical environments.
Recommended
Data Center and Server Power
In data centers, the LTM4643IY#PBF provides efficient power conversion for servers and storage systems. Its high efficiency reduces energy consumption and cooling requirements. The module's four outputs can power CPUs, memory, and I/O controllers. The ability to parallel outputs for up to 12A supports high-current rails. The compact LGA package enables high-density power delivery on server motherboards, and the integrated design simplifies thermal management.
Recommended
Recommended Products Summary
Engineering reference data for LTM4643IY#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTM4643EY#PBF | LTM4643MPV#PBF | LTM4644IY#PBF |
|---|---|---|---|---|
| Package | LGA (16mm x 16mm x 1.82mm) | LGA (16mm x 16mm x 1.82mm) | LGA (16mm x 16mm x 1.82mm) | LGA (16mm x 16mm x 1.82mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Outputs | 4 | 4 | 4 | 4 |
| Output Current per Output | 3A | 3A | 3A | 4A |
| Maximum Output Current (Parallel) | 12A | 12A | 12A | 16A |
| Input Voltage Range | 4V to 20V | 4V to 20V | 4V to 20V | 4V to 20V |
| Output Voltage Range | 0.6V to 3.3V | 0.6V to 3.3V | 0.6V to 3.3V | 0.6V to 5.5V |
| Temperature Grade | Industrial (-40C to +125C) | Extended (-40C to +125C) | Military (-55C to +125C) | Industrial (-40C to +125C) |
Key Differentiators
- Integrated inductors and FETs in a compact LGA package (vs Discrete DC-DC solutions)
- Quad outputs with 3A each, parallelable to 12A (vs LTM4644IY#PBF)
- Industrial temperature grade (-40C to +125C) (vs LTM4643EY#PBF)
Design Notes
For optimal thermal performance, use a multi-layer PCB with a solid ground plane and thermal vias under the LTM4643's exposed pad. The datasheet recommends a minimum of 4 layers with 2oz copper for high-current applications. Ensure adequate copper area for heat spreading to keep the junction temperature within limits.
Select input and output capacitors according to the datasheet guidelines. Typically, use 100uF ceramic capacitors for input and 100uF for each output. The module's internal compensation allows stable operation with a wide range of output capacitors, but following the recommended values ensures optimal transient response.
When paralleling outputs for higher current, ensure all outputs are connected together and use the TRACK pin for proper current sharing. Do not exceed the maximum input voltage of 20V. Also, verify that the total power dissipation does not exceed the module's thermal rating; use the efficiency curves in the datasheet to estimate losses.
Compliance Information
RoHS and REACH compliant per distributor data. Not AEC-Q100 qualified as it is not an automotive-grade part.
