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Analog Devices Inc. DC1543A
- Part No.:
- DC1543A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1543A.pdf
- Description:
- EVAL BOARD FOR LTM4641
- Quantity:
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Product details
Overview
LTM4641 from Analog Devices (formerly Linear Technology) is a 38V input, 10A step-down DC/DC µModule regulator with integrated power MOSFETs, inductor, and advanced input/load protection circuitry. It delivers regulated output voltages from 0.6V to 6V with ±1.5% total DC error, supports differential remote sensing, and operates across 4.5V–38V input range - used in avionics power supplies requiring robust overvoltage crowbar and input disconnect capability.
For engineers reviewing the LTM4641 datasheet, LTM4641 pinout, LTM4641 application, or LTM4641 equivalent, key selection considerations include its 15mm × 15mm BGA package, programmable fault thresholds (UVLO, OVLO, IOVRETRY, OVPGM), fast 400ns crowbar response, and parallelability for >10A output current.
Technical Context
The LTM4641 integrates a constant-on-time current-mode controller, internal gate drivers, N-channel power MOSFETs, and a shielded inductor in a single BGA module. Its architecture enables high step-down ratios (e.g., 38V→1V) and sub-20μs load transient settling time with 5A/μs slew rate.
Input protection includes programmable UVLO (3.5V–4.5V hysteresis), VINH/VINL dual-input biasing, and N-channel MSP driver for external power-interrupt MOSFETs. Load protection features latchoff-capable crowbar (CROWBAR pin), OVP threshold set via OVPGM (650–680mV), and differential remote sense amplifier referenced to VOSNS±.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide-range industrial/avionic inputs; 4V start-up possible with ramped VIN. |
| Output Current | 10A continuous, 12A peak - sustained delivery without derating at TA ≤ 85°C with proper layout. |
| Output Voltage Range | 0.6V to 6V - set externally via resistor divider; 0.6V minimum enables core voltage regulation. |
| Total DC Output Error | ±1.5% - includes line, load, temperature, and reference drift; ensures tight POL regulation. |
| Crowbar Response Time | 400ns to 500ns - enables sub-microsecond overvoltage shutdown before downstream damage. |
| Package Dimensions | 15mm × 15mm × 5.01mm BGA - compact footprint with bottom thermal pad for efficient heat transfer. |
| Remote Sense Accuracy | Differential VOSNS± input range: 0–2.7V CM, 0–2.7V DM - rejects PCB IR drop up to 2.7V. |
Pinout & Package
144-ball BGA package (15mm × 15mm × 5.01mm) with SnPb or RoHS-compliant finish; thermal pad on underside for PCB-level heat dissipation. Pin mapping validated per Linear Technology LTM4641 datasheet Rev. FE (2019).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINH / VINL | High-side and low-side input power rails | VINH powers switching stage; VINL powers control circuitry - enables independent biasing and surge stopper integration. |
| VOUT | Main regulated output node | Delivers up to 10A; connects directly to load and remote sense return path. |
| VOSNS+ / VOSNS− | Differential remote sense inputs | Measure point-of-load voltage; reject common-mode noise and trace resistance up to 2.7V. |
| CROWBAR | Active-high crowbar enable output | Drives external N-channel MOSFET to short output during OVP; responds within 500ns. |
| OVPGM | Output overvoltage threshold programming | Sets OVP inception at 650–680mV; 12mV max error enables precise 1.0V or 3.3V rail protection. |
| TEMP | NTC-based temperature indicator | Outputs analog voltage (950mV @ 25°C, 585mV @ 125°C); triggers OVT shutdown below 438mV (~145°C). |
| RUN | Enable/disable control input | Logic-high (>1.15V) enables regulation; pull-down to GND disables output and resets faults. |
| PGOOD | Power-good status output | Open-drain signal asserts high when VOUT is within ±5% of target; includes 8–24mV hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power train | Includes controller, MOSFETs, inductor, and bias circuitry - eliminates 30+ discrete components and simplifies layout. |
| Programmable input protection | Customizable UVLO, OVLO, and IOVRETRY thresholds via resistive dividers - enables tailored surge stopper behavior. |
| Fast crowbar OVP | Sub-500ns response to output overvoltage - protects FPGAs, ADCs, and processors from catastrophic failure. |
| Dual-input power architecture | VINH/VINL separation allows independent filtering and sequencing - improves EMI and enables hot-swap compatibility. |
| Parallel operation support | Current-sharing via IMON pins and external resistors - scales output current beyond 10A without master-slave complexity. |
Applications
| Avionics Power Distribution | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Regulating 28V aircraft bus to 3.3V/1.2V for flight control computers and sensor interfaces under extreme thermal and EMI conditions. IC Role / Device Role / Timing Role: Primary POL regulator with input disconnect and crowbar OVP - ensures fail-safe shutdown during lightning-induced transients. Use Value: Eliminates need for external TVS + crowbar circuit; meets DO-160 Section 22 Level 3 surge immunity with minimal BOM count. |
Use Scenario: Providing isolated 5V and 3.3V rails to modular I/O cards in programmable logic controllers operating in factory environments with 24V DC supply. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with remote sensing and overtemperature monitoring - maintains accuracy across 0°C–70°C ambient range. Use Value: ±1.5% output error and differential sensing ensure consistent ADC reference and digital logic timing across long backplane traces. |
| Medical Imaging Subsystems | Test & Measurement Equipment |
Use Scenario: Generating stable 1.0V core supply for high-speed FPGA-based image processing units in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-noise, fast-transient POL regulator with pre-bias start-up - avoids brownout during battery-switchover events. Use Value: 20μs load-step settling and soft-start tracking enable glitch-free initialization of multi-rail FPGA configurations. |
Use Scenario: Powering precision analog front-ends and DACs in benchtop oscilloscopes requiring ultra-low ripple and tight voltage tolerance. IC Role / Device Role / Timing Role: Main 5V/3.3V supply with <16mVP-P ripple and ±1.5% DC accuracy - preserves SNR in 16-bit data converters. Use Value: Integrated inductor and optimized layout reduce conducted EMI by >15dB vs discrete solutions, easing CISPR-32 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-reliability DC/DC µModule applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4650A | 12A rated, 4–36V input, no CROWBAR pin, uses different OVP architecture (internal comparator only) | Lacks fast external crowbar drive; better suited for space-constrained non-safety-critical loads | Select LTM4650A only if crowbar functionality is unnecessary and higher current is required without added protection circuitry. |
| MAXM17504 | 10A, 4.5–60V input, integrated MOSFETs but no remote sense amplifier or programmable OVP/UVLO | No differential sensing or configurable fault thresholds - requires external components for precision POL or surge protection | Choose MAXM17504 for cost-sensitive industrial applications where ±2% output accuracy and basic protection suffice. |
Compared with LTM4641, LTM4650A offers higher current but removes crowbar drive and remote sense flexibility, while MAXM17504 trades programmability and sensing fidelity for wider input range and lower unit cost - making LTM4641 optimal for safety-critical, high-accuracy avionics and medical systems.
Availability
LTM4641 is available at Aetrix Electronics and suitable for avionics power distribution, industrial PLC I/O modules, medical imaging subsystems, and test & measurement equipment requiring stable component supply and long-term lifecycle support.
Supply support for LTM4641 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and continues its legacy of high-performance power management ICs and µModule regulators targeting demanding applications.
The LTM4641 belongs to the µModule regulator product line, designed specifically for system designers needing complete, verified, and compact DC/DC solutions with advanced protection for harsh-environment electronics.
FAQ
What is the maximum input voltage rating for the LTM4641?
The LTM4641 has an absolute maximum input voltage rating of 40V on VINH and VINL pins, with guaranteed operation up to 38V DC. The device is tested at 40V under controlled pulsed conditions to ensure reliability without compromising lifetime. For continuous operation, 38V is the specified maximum input voltage per the datasheet's Electrical Characteristics table.
Does the LTM4641 support remote sensing, and how is it implemented?
Yes, the LTM4641 supports true differential remote sensing via dedicated VOSNS+ and VOSNS− pins. These inputs connect directly to the load's power and ground points, enabling the regulator to compensate for PCB trace resistance and maintain ±1.5% output accuracy at the point of load. The differential amplifier accepts up to 2.7V common-mode voltage and 2.7V differential range.
How does the crowbar overvoltage protection work on the LTM4641?
The LTM4641's crowbar protection activates when the differential sense voltage exceeds the OVPGM-set threshold (typically 666mV). It drives the CROWBAR pin high within 400–500ns to turn on an external N-channel MOSFET that shorts the output to ground. This fast response prevents downstream damage during fault events such as feedback resistor failure or control loop instability.
Can multiple LTM4641 modules be paralleled for higher current, and what is required?
Yes, the LTM4641 supports current sharing in parallel configurations using its IMON pins and external resistors. Each module's IMON output is connected to a shared bus with matched resistors to force equal current distribution. No master-slave configuration is needed, and the design maintains ±5% current balance across modules under full load and thermal variation.
What thermal performance can be expected from the LTM4641 in a typical 4-layer PCB layout?
In a standard 4-layer board with 2oz copper, 6 thermal vias under the exposed pad, and 1in² copper area, the LTM4641 achieves θJA ≈ 10.4°C/W. At 10A output and 12V input, junction temperature rise is ~65°C above ambient - well within the 125°C max rating. Derating curves in the datasheet confirm 10A continuous operation up to 85°C ambient with this layout.
DC1543A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Packaging:
- Box
- Product Status:
- Obsolete
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 0.8V, 1V, 1.2V, 1.5V, 1.8V, 3.3V, 5V or 6V
- Voltage - Input:
- 10A
- Regulator Topology:
- 4.5V ~ 38V
- Frequency - Switching:
- Buck
- Contents:
- -
- Utilized IC / Part:
- Board(s)
- Power - Output:
- LTM4641
DC1543A FAQ
1.How can I place an order for DC1543A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1543A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DC1543A reliable?
The price and inventory of DC1543A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1543A is usually 5 days.
3.What payment methods are accepted for DC1543A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1543A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1543A?
DC1543A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1543A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DC1543A?
For technical support, including DC1543A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1543A requirements.
6.How does Aetrix verify that DC1543A is sourced from the original manufacturer or authorized distributors?
All DC1543A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DC1543A meets industry standards.
7.What is the process for return or replacement of DC1543A?
All DC1543A units undergo pre-shipment inspection (PSI). If there is an issue with DC1543A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DC1543A part is unused and in its original packaging.
Return procedure for DC1543A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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