LTM4643EY#PBF - Quad 3A µModule Regulator | Analog Devices
MPN: LTM4643EY#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.73 | $28.73 |
| 10 | $26.64 | $266.40 |
| 100 | $24.55 | $2,455.00 |
| 500 | $22.46 | $11,230.00 |
| 1,000 | $20.37 | $20,370.00 |
LTM4643EY#PBF Overview
A µModule regulator is a complete DC-DC converter system-in-package that includes the controller, power stage, inductors, and compensation, offering a high level of integration and ease of use. It belongs to the broader category of power management ICs, specifically switching regulators, and is designed for point-of-load (PoL) applications where space is critical and efficiency is paramount. The LTM4643EY#PBF is part of the LTM4643 series, which is known for its ultrathin profile and high power density.
Key features include a wide input voltage range, configurable output voltage, high efficiency, and the ability to parallel outputs for higher current. The module operates at a switching frequency up to 1.2 MHz, allowing for small external components. It also includes output voltage tracking and sequencing capabilities, making it suitable for complex power supply designs. The BGA-77 package provides excellent thermal performance, with a low thermal resistance that enables operation at high ambient temperatures without derating.
The LTM4643EY#PBF uses a current-mode control architecture, ensuring stable operation over a wide range of load conditions. The integrated inductors and power FETs reduce parasitic losses, contributing to high efficiency across the load range. The module also features overcurrent and overtemperature protection, enhancing system reliability.
Typical applications include power supplies for FPGAs, ASICs, processors, and other digital ICs in networking, telecommunications, industrial, and data center equipment. The quad output configuration is ideal for powering multiple voltage rails from a single module, reducing component count and board area.
When designing with the LTM4643EY#PBF, it is important to consider input and output capacitor selection, as well as thermal management. The module's exposed pad should be connected to a large copper area for heat dissipation. Additionally, the input voltage range and output current requirements must be carefully evaluated to ensure proper operation.
Drop-in alternatives for LTM4643EY#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 LTM4643EY#PBF (same form factor and footprint) — differing in Input Voltage Range, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTM4643IV#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4643MPY
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4643EY#PBF
✅ Drop-In✓ In Stock
$20.37 / Unit
View Datasheet →LTM4643IY#PBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$15.9 / Unit
View Datasheet →LTM4643MPY#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTM4643EY#PBF
✅ Drop-In✓ In Stock
$20.37 / Unit
View Datasheet →LTM4643EY#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 Channel | 3 A |
| Total Output Current (Parallel) | 12 A |
| Input Voltage Range | 4 V to 20 V (2.375 V to 20 V with external bias) |
| Switching Frequency | 1.2 MHz (max) |
| Package | BGA-77 |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to +125°C |
| RoHS Status | Compliant |
| Number of Terminals | 77 |
| Package Shape | Rectangular |
| Surface Mount | Yes |
| Temperature Grade | Other |
LTM4643EY#PBF Pin Configuration
| Pin A1 | VIN — Input supply voltage |
| Pin A2 | VOUT1 — Output 1 |
| Pin A3 | VOUT2 — Output 2 |
| Pin A4 | VOUT3 — Output 3 |
| Pin A5 | VOUT4 — Output 4 |
| Pin B1 | GND — Ground |
| Pin B2 | FB1 — Feedback for output 1 |
| Pin B3 | FB2 — Feedback for output 2 |
| Pin B4 | FB3 — Feedback for output 3 |
| Pin B5 | FB4 — Feedback for output 4 |
| Pin C1 | RUN1 — Enable for output 1 |
| Pin C2 | RUN2 — Enable for output 2 |
| Pin C3 | RUN3 — Enable for output 3 |
| Pin C4 | RUN4 — Enable for output 4 |
| Pin C5 | PGOOD — Power good indicator |
Typical Applications
LTM4643EY#PBF is suitable for 6 applications: FPGA Power Supplies, ASIC and Processor Power, Networking Equipment, Industrial Automation, Data Center and Server Power, Telecommunications.
FPGA Power Supplies
The LTM4643EY#PBF provides four independent 3A outputs, ideal for powering FPGA rails such as VCCINT, VCCAUX, and VCCO. Its adjustable output from 0.6V to 3.3V matches common FPGA core and I/O voltages. The high efficiency and integrated inductors reduce heat and board space, enabling compact designs. With a wide input range of 4V to 20V, it can be powered from a 12V intermediate bus. The module's current-mode control ensures stable operation under dynamic loads typical of FPGA operation.
Recommended
ASIC and Processor Power
The LTM4643EY#PBF can power ASICs and processors that require multiple low-voltage rails. Its quad outputs can be configured to provide different voltages, such as 1.0V, 1.2V, 1.8V, and 3.3V, from a single module. The high current capability of 3A per output is sufficient for many digital ICs. The module's low profile and small footprint are advantageous in space-constrained designs. Additionally, the ability to parallel outputs allows for higher current if needed, providing design flexibility.
Recommended
Networking Equipment
In networking equipment such as switches and routers, the LTM4643EY#PBF provides efficient power conversion for line cards and switch fabrics. Its wide input range accommodates 12V or 24V backplane voltages. The quad outputs can power multiple logic rails, reducing component count and improving reliability. The module's high efficiency minimizes heat generation, which is critical in densely packed networking chassis. The integrated inductors and capacitors simplify PCB layout and reduce electromagnetic interference.
Recommended
Industrial Automation
The LTM4643EY#PBF is suitable for industrial automation systems that require robust power supplies. Its input voltage range of 4V to 20V covers common industrial supply rails. The module's wide operating temperature range (-40°C to +125°C) ensures reliable operation in harsh environments. The integrated protection features, such as overcurrent and overtemperature shutdown, enhance system safety. The compact BGA-77 package allows for high-density PCB designs in control cabinets and PLCs.
Recommended
Data Center and Server Power
In data centers and servers, the LTM4643EY#PBF provides efficient point-of-load conversion for CPUs, GPUs, and memory. Its quad outputs can power multiple voltage rails, such as Vcore, VCCIO, and VDDQ, from a single module. The high efficiency reduces power loss and cooling requirements, contributing to lower total cost of ownership. The module's ability to parallel outputs allows for scaling to higher currents. The small footprint enables high-density server boards.
Recommended
Telecommunications
The LTM4643EY#PBF is ideal for telecommunications equipment, including base stations and optical transport systems. Its wide input range supports 12V or 24V telecom supplies. The quad outputs can power multiple logic and interface rails, simplifying power distribution. The module's high efficiency and low noise are beneficial for sensitive communication circuits. The compact package allows for dense board layouts in rack-mounted equipment.
Recommended
Recommended Products Summary
Engineering reference data for LTM4643EY#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTM4643IV#PBF | LTM4643MPY | LTM4643IY#PBF |
|---|---|---|---|---|
| Package | BGA-77 | BGA-77 | BGA-77 | BGA-77 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current per Channel | 3 A | 3 A | 3 A | 3 A |
| 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 3.3V |
| Switching Frequency | 1.2 MHz (max) | 1.2 MHz (max) | 1.2 MHz (max) | 1.2 MHz (max) |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -55°C to +125°C | -40°C to +125°C |
| RoHS | Compliant | Compliant | Non-compliant | Compliant |
Key Differentiators
- Quad output with 3A per channel (vs LTM4643IV#PBF)
- Wide input voltage range (vs LTM4643MPY)
- High switching frequency (vs LTM4643IY#PBF)
Design Notes
The LTM4643EY#PBF in BGA-77 package has an exposed pad that must be soldered to a large copper area for heat dissipation. For high current operation, ensure adequate thermal vias and a copper pour on the PCB to keep the junction temperature within limits. Refer to the datasheet's thermal derating curves.
Place input and output capacitors close to the module pins to minimize parasitic inductance. Use low-ESR ceramic capacitors, typically 10µF to 22µF per output. The datasheet provides recommended capacitor values and layout guidelines for optimal performance.
Ensure the input voltage does not exceed the absolute maximum rating of 20V (or 26V with bias). Also, verify that the output voltage setting resistors are accurate to avoid overvoltage. The RUN pins can be used for sequencing; ensure proper timing to avoid inrush current issues.
Compliance Information
RoHS compliant per 'PBF' suffix. Other compliance data not specified in provided sources.
