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Analog Devices Inc. LTC3637MPDHC#TRPBF
- Part No.:
- LTC3637MPDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3637MPDHC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,383
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Product details
Overview
LTC3637MPDHC#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input 76V step-down DC/DC regulator with integrated 350mΩ P-channel MOSFET, programmable 0.1A–1A output current, and 12µA no-load quiescent current. It operates from 4V to 76V input, delivers up to 1A load, supports adjustable or fixed 1.8V/3.3V/5V outputs, and is qualified for –55°C to 150°C junction temperature in harsh industrial and avionics power systems.
For engineers reviewing the LTC3637MPDHC#TRPBF datasheet, LTC3637MPDHC#TRPBF pinout, LTC3637MPDHC#TRPBF application, or LTC3637MPDHC#TRPBF equivalent, key selection criteria include its 76V max input rating, programmable peak current limit via ISET, Burst Mode® operation for ultra-low IQ, precise RUN/OVLO thresholds, and thermal-enhanced 16-lead DFN (5mm × 3mm) package with exposed GND pad.
Technical Context
The LTC3637MPDHC#TRPBF uses hysteretic Burst Mode® control with an internal P-channel high-side switch, enabling 100% duty cycle dropout operation and inherent short-circuit protection. Its feedback loop compares VFB against a 0.800V ±1% reference, with VPRG1/VPRG2 pins selecting fixed outputs or enabling external resistor programming.
Peak inductor current is set by a resistor from ISET to GND (240mA–2.4A range), directly determining maximum average output current (half the peak value). Soft-start is implemented via internal 0.8ms ramp or external capacitor on SS pin, while RUN and OVLO pins provide independently programmable enable and overvoltage lockout thresholds with 110mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 48V telecom, 60V industrial buses, or 72V battery stacks without pre-regulation. |
| Max Output Current | 1A - guaranteed average output current when peak current is set to ≥2A via ISET resistor or floating connection. |
| Quiescent Current | 12µA in Burst Mode sleep - enables multi-year battery life in always-on remote sensors or low-power IoT nodes. |
| Feedback Reference | 0.800V ±1% - enables accurate output voltage setting from 0.8V to VIN using external resistive divider. |
| Power Switch RDS(on) | 350mΩ - limits conduction loss at 1A to ~350mW, supporting thermally constrained PCB layouts. |
| Operating Temp Range | –55°C to 150°C junction - qualified for extended-temperature avionics, downhole oil & gas, and military vehicle electronics. |
| Package | 16-lead DFN (5mm × 3mm, 0.75mm height) with exposed GND pad - provides θJA = 43°C/W for high-power density designs. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 3mm), 0.75mm profile, exposed thermal pad (Pin 17) connected to GND. Requires soldering of exposed pad to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection to inductor and internal P-MOSFET drain; carries high di/dt switching current - requires tight layout and Kelvin return path. |
| VIN (3) | Main input supply | Accepts 4V–76V; must be bypassed with low-ESR ceramic capacitor close to pin to suppress high-frequency noise and supply ripple. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating feedback error; pulls low when VFB falls below 0.795V - used for system fault signaling or sequencing. |
| VPRG1 / VPRG2 (6,7) | Output voltage configuration | Selects 1.8V/3.3V/5V fixed output or enables adjustable mode; eliminates external resistors for common rail applications. |
| GND (8,16,17) | Ground reference & thermal path | Pins 8/16 are signal GND; Pin 17 is exposed thermal pad - all must connect to low-impedance PCB ground plane for EMI control and thermal dissipation. |
| VFB (9) | Feedback input | Monitors divided output voltage; compared to 0.800V reference - accuracy directly determines output regulation tolerance. |
| SS (10) | Soft-start timing control | Capacitor-to-GND sets output ramp time (1ms per 16.5nF); prevents input droop during startup and ensures controlled power-up sequencing. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak inductor current (240mA–2.4A); defines max output current and influences component size/ripple trade-offs. |
| OVLO (12) | Overvoltage lockout input | Resistive divider from VIN sets shutdown threshold above 1.21V - protects downstream circuitry during input transients or surge events. |
| RUN (14) | Enable/disable control | Threshold at 1.21V rising edge enables regulation; falling below 1.10V disables switching - enables precise UVLO or system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 12µA no-load IQ while delivering full 1A output - enables energy harvesting and battery-powered applications with multi-year runtime. |
| Programmable peak current limit | Adjusts max output from 0.1A to 1A via single ISET resistor - optimizes inductor/capacitor sizing and reduces BOM cost and board area. |
| 100% duty cycle dropout | Supports output regulation down to VIN – 0.5V using P-channel switch - eliminates need for LDO post-regulator in wide-input industrial supplies. |
| Precision RUN and OVLO comparators | 1.21V threshold with 110mV hysteresis - enables robust, noise-immune input voltage monitoring without external supervisory ICs. |
| Fixed-output voltage selection | 1.8V/3.3V/5V via VPRG1/VPRG2 pin strapping - removes feedback resistors and associated layout sensitivity for standard rails. |
| Thermally enhanced DFN package | θJA = 43°C/W with exposed GND pad - sustains 1A continuous output at 76V input in compact 15mm² footprint without heatsink. |
Applications
| Industrial Control Supply | Avionics Power Module |
|---|---|
|
Use Scenario: Regulating unregulated 28V or 72V aircraft bus to stable 5V/3.3V for flight control sensors and data acquisition units. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, low-noise, high-reliability DC power with built-in OVLO and thermal protection. Use Value: Eliminates need for discrete MOSFET + controller solution; -55°C to 150°C qualification ensures operation across cabin-to-engine bay environments. |
Use Scenario: Converting 270V DC aircraft starter-generator output to 12V intermediate bus for cockpit displays and communication subsystems. IC Role / Device Role / Timing Role: High-voltage buck converter operating in Burst Mode® to minimize standby power draw during ground maintenance. Use Value: 76V absolute max input withstands transient spikes up to 80V; programmable OVLO prevents false triggering during engine cranking surges. |
| Downhole Oil & Gas Instrumentation | Ruggedized Portable Test Equipment |
|
Use Scenario: Powering MEMS pressure/temperature sensors and telemetry radios in borehole tools exposed to >150°C ambient temperatures. IC Role / Device Role / Timing Role: High-temperature DC/DC regulator maintaining 3.3V output from 48V battery stack under extreme thermal stress. Use Value: MP-grade qualification (–55°C to 150°C) and 12µA IQ extend battery life in sealed, non-serviceable tool housings. |
Use Scenario: Providing regulated 5V/1A power for handheld oscilloscopes and multimeters powered by Li-ion battery packs (12V–36V). IC Role / Device Role / Timing Role: Wide-input buck converter enabling single-battery operation across multiple cell configurations without redesign. Use Value: Adjustable current limit via ISET allows optimization for different battery chemistries and discharge profiles while minimizing heat rise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3637HDHC#TRPBF | Same silicon, rated for –40°C to 150°C (vs. –55°C to 150°C); identical electrical specs and pinout. | Not qualified for extended cold-start environments below –40°C; suitable where minimum ambient is ≥–40°C. | Select if full MP-grade temperature range is not required and cost optimization is prioritized. |
| LTC3637MPMSE#TRPBF | Same functionality and temp grade, but in 16-lead MSOP package (5mm × 4.9mm); θJA = 45°C/W vs. 43°C/W. | Higher thermal resistance and larger footprint; preferred only where DFN assembly is unavailable or creepage requirements mandate MSOP. | Choose only when high-voltage clearance (>6mm) between VIN and SW is mandatory per safety standards. |
Compared with LTC3637MPDHC#TRPBF, the HDHC variant sacrifices cold-temperature capability for lower cost, while the MPMSE variant trades thermal performance and size for higher voltage creepage - neither offers functional or electrical improvement, making the MPDHC the optimal choice for extended-temperature, space-constrained, high-efficiency designs.
Availability
LTC3637MPDHC#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power modules, and downhole instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3637MPDHC#TRPBF 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 maintains full product support, manufacturing, and qualification for all Linear power ICs including the LTC3637 family.
The LTC3637 product line was designed for high-reliability, wide-input DC/DC conversion in aerospace, defense, and industrial systems where input voltage can exceed 60V and ambient temperature exceeds 125°C.
FAQ
What is the maximum input voltage rating for the LTC3637MPDHC#TRPBF?
The LTC3637MPDHC#TRPBF has an absolute maximum input voltage rating of 80V, with guaranteed operation up to 76V. This allows direct regulation from 48V, 60V, or 72V industrial and automotive battery systems without pre-regulation stages. Operation above 76V risks exceeding safe operating area limits and is not recommended.
How does the ISET pin configure output current in the LTC3637MPDHC#TRPBF?
The ISET pin on the LTC3637MPDHC#TRPBF sets peak inductor current using an internal 5µA current source and external resistor to GND. A 100kΩ resistor yields ~1A peak current, resulting in ~0.5A average output; floating ISET gives 2.4A peak (1.2A max average). The relationship follows RISET = 140k • IPEAK – 24k for 200mA < IPEAK < 2A.
Does the LTC3637MPDHC#TRPBF support fixed output voltages without external resistors?
Yes, the LTC3637MPDHC#TRPBF supports 1.8V, 3.3V, and 5V fixed outputs using VPRG1 and VPRG2 pin strapping: short both to SS for 1.8V, VPRG1 to SS + VPRG2 to GND for 5V, or VPRG1 to GND + VPRG2 to SS for 3.3V. This eliminates external feedback resistors and improves noise immunity in noisy environments.
What thermal performance can be expected from the LTC3637MPDHC#TRPBF in its DFN package?
The LTC3637MPDHC#TRPBF in the 5mm × 3mm DFN package achieves θJA = 43°C/W when the exposed GND pad is properly soldered to a 2-layer 1oz copper PCB with ≥2cm² thermal pad. At 1A load and 76V input, typical junction temperature rise is ~45°C above ambient, well within the –55°C to 150°C rating when ambient stays below 105°C.
Can the LTC3637MPDHC#TRPBF operate with 100% duty cycle during dropout conditions?
Yes, the LTC3637MPDHC#TRPBF uses a P-channel high-side MOSFET enabling true 100% duty cycle operation. When VIN approaches VOUT, the switch remains continuously on, sustaining output current up to the programmed peak limit (e.g., 2.4A peak → 1.2A max output). Power dissipation increases significantly below 10V input due to RDS(on) and must be thermally managed.
LTC3637MPDHC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 76V
- Current - Output:
- 1A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3637MPDHC#TRPBF FAQ
1.How can I place an order for LTC3637MPDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637MPDHC#TRPBF 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 LTC3637MPDHC#TRPBF reliable?
The price and inventory of LTC3637MPDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637MPDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3637MPDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637MPDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637MPDHC#TRPBF?
LTC3637MPDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637MPDHC#TRPBF 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 LTC3637MPDHC#TRPBF?
For technical support, including LTC3637MPDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637MPDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3637MPDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3637MPDHC#TRPBF 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 LTC3637MPDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3637MPDHC#TRPBF?
All LTC3637MPDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637MPDHC#TRPBF, 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 LTC3637MPDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3637MPDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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