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Analog Devices Inc. LTC3637MPDHC#PBF
- Part No.:
- LTC3637MPDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3637MPDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,111
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Product details
Overview
LTC3637MPDHC#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 76V input, 1A synchronous step-down DC/DC regulator with integrated 350mΩ high-side PMOS switch, 12µA quiescent current in Burst Mode® operation, and –55°C to 150°C operating junction temperature range. It delivers regulated output from 0.8V to VIN using programmable peak current limit (100mA–1A), precise 0.8V ±1% feedback reference, and internal/external soft-start - ideal for rugged industrial control supplies and avionics power rails.
For engineers reviewing the LTC3637MPDHC#PBF datasheet, LTC3637MPDHC#PBF pinout, LTC3637MPDHC#PBF application, or LTC3637MPDHC#PBF equivalent, key selection considerations include its 76V max input rating, programmable overvoltage lockout, low-dropout 100% duty cycle capability, thermal-enhanced 5mm × 3mm DFN package with exposed GND pad, and MP-grade extended temperature qualification.
Technical Context
The LTC3637MPDHC#PBF implements a hysteretic Burst Mode® control architecture with internal PMOS high-side switch and reverse-current comparator, enabling ultra-low 12µA no-load supply current while maintaining regulation. Its peak current limit is set via external resistor on ISET pin (240mA–2.4A typical), directly determining maximum average output current (up to 1A) and influencing inductor size and output ripple.
Operation relies on precise 0.8V feedback threshold with ±1% tolerance across –55°C to 150°C, programmable RUN pin threshold (1.21V rising, 1.10V falling), and OVLO pin for input overvoltage protection. The device supports fixed 1.8V/3.3V/5V outputs or adjustable configuration via VPRG1/VPRG2 pins and requires no external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports wide-range industrial, automotive, and avionics inputs including 24V, 48V, and 72V battery systems. |
| Max Output Current | 1A - achievable with 2.4A peak current limit; average output current = 50% of peak current per architecture. |
| Quiescent Current | 12µA in Burst Mode® - enables multi-year battery life in always-on portable instruments and remote sensors. |
| Feedback Reference | 0.8V ±1% - ensures tight output voltage accuracy across full MP-grade temperature range (–55°C to 150°C). |
| Switch RDS(on) | 350mΩ - low conduction loss enables high efficiency at 1A load, especially critical in thermally constrained DFN packages. |
| Soft-Start Time | 0.8ms internal or programmable via SS pin capacitor - prevents input droop during cold-start in high-capacitance systems. |
| Overvoltage Lockout | Programmable via OVLO pin - disables switching when input exceeds user-defined threshold, protecting downstream circuitry. |
| Package | 16-lead 5mm × 3mm DFN with exposed GND pad - θJA = 43°C/W; requires soldered thermal pad for rated 150°C junction operation. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 3mm, 0.75mm height) with exposed GND pad (Pin 17), rated for –55°C to 150°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connection to inductor and catch diode anode; carries high di/dt switching current - requires short, low-inductance layout. |
| VIN (3) | Main Input Supply | Accepts 4V–76V input; bypass capacitor required between VIN and GND for stability and EMI suppression. |
| FBO (5) | Feedback Comparator Output | Open-drain flag indicating feedback error; 20µA pull-up and 70Ω pull-down enable simple fault monitoring. |
| VPRG1 / VPRG2 (6,7) | Output Voltage Selection | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or connecting to SS pin - eliminates external resistors for common outputs. |
| GND (8,16,17) | Ground Reference | Pins 8/16 are signal GND; Pin 17 is exposed thermal pad - all must connect to low-impedance PCB ground plane. |
| VFB (9) | Feedback Input | Monitors divided output voltage; compares to 0.8V reference - direct connection to VOUT for fixed outputs. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); floating defaults to 0.8ms - prevents inrush current damage. |
| ISET (11) | Peak Current Programming | Resistor-to-GND sets peak current limit (240mA–2.4A); short to GND = min, open = max - determines max load and component sizing. |
| OVLO (12) | Overvoltage Lockout Input | Voltage divider from VIN sets disable threshold (1.21V trip); protects against input surges above safe operating range. |
| RUN (14) | Enable/Shutdown Control | 1.21V enables operation; <0.7V forces 3µA shutdown - supports system-level power sequencing and undervoltage lockout. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces no-load supply current to 12µA while maintaining regulation - extends battery life without sacrificing transient response. |
| Programmable Peak Current Limit | Adjusts max output from 100mA to 1A via single ISET resistor - optimizes inductor/capacitor size and light-load efficiency. |
| 100% Duty Cycle Low-Dropout Mode | Enables output regulation even when VIN ≈ VOUT - critical for brownout resilience in automotive and industrial applications. |
| Precision RUN Pin Threshold | 1.21V rising / 1.10V falling with 110mV hysteresis - ensures clean, chatter-free power-up and shutdown across extreme temperatures. |
| Thermally Enhanced DFN Package | θJA = 43°C/W with soldered exposed pad - sustains 1A continuous output at 150°C junction temperature in compact layouts. |
| No External Compensation Required | Internal compensation enables stable operation with minimal external components - reduces BOM count and layout sensitivity. |
Applications
| Industrial Control Supplies | Avionics Power Systems |
|---|---|
Use Scenario: Regulating 28V or 72V aircraft bus to 5V/3.3V for flight control sensors and data acquisition units. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering clean, reliable power with high input voltage tolerance and extended temperature operation. Use Value: Withstands MIL-STD-704 transients up to 76V and operates continuously from –55°C to +150°C - meets DO-160 environmental requirements. | Use Scenario: Powering mission-critical navigation processors and inertial measurement units (IMUs) in unmanned aerial vehicles (UAVs). IC Role / Device Role / Timing Role: High-reliability DC/DC converter providing isolated, low-noise 1.8V core voltage with programmable overvoltage lockout. Use Value: 12µA quiescent current minimizes standby drain on UAV battery packs; 100% duty cycle maintains regulation during engine start voltage sag. |
| Medical Imaging Subsystems | Portable Test Equipment |
Use Scenario: Generating stable 3.3V and 5V rails for analog front-end amplifiers and ADCs in handheld ultrasound probes. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current buck regulator powering sensitive analog signal chains with minimal thermal rise. Use Value: Burst Mode® operation eliminates switching noise near sensitive analog circuits; ±1% VFB ensures accurate sensor biasing over full medical temperature range. | Use Scenario: Powering multimeter logic and display subsystems from 9V alkaline or Li-ion batteries with variable input voltage. IC Role / Device Role / Timing Role: Wide-input buck converter supporting battery discharge from 9V down to 4V while maintaining regulated outputs. Use Value: 4V minimum input enables full battery utilization; programmable peak current allows optimization for low-power sleep vs. active measurement modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3637HDHC#PBF | Same pinout and features, but rated for –40°C to 150°C (not –55°C); lower cold-temperature guarantee. | Suitable for commercial/industrial environments where –55°C operation is not required. | Select LTC3637MPDHC#PBF only when full military-grade cold-start capability (–55°C) is mandatory. |
| LT8609SIV#PBF | 42V max input, 2.5A output, 2.5µA IQ, Silent Switcher® architecture - superior EMI performance but lower voltage rating. | Better for noise-sensitive applications (e.g., RF modules) with ≤42V input; cannot replace in 72V avionics rails. | Choose LT8609SIV#PBF when EMI compliance is critical and input voltage stays below 42V; LTC3637MPDHC#PBF remains sole option for >42V inputs. |
Compared with LTC3637HDHC#PBF, the LTC3637MPDHC#PBF adds guaranteed operation at –55°C - essential for arctic deployment or space-qualified systems - while matching all electrical specs. Against LT8609SIV#PBF, it trades EMI performance for 76V input capability, making it irreplaceable in high-voltage industrial and aerospace applications.
Availability
LTC3637MPDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power systems, and portable test equipment requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for LTC3637MPDHC#PBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3637 belongs to ADI's high-voltage monolithic DC/DC regulator product line, designed specifically for robust, wide-input industrial, automotive, and aerospace power conversion where reliability across extreme temperatures and input transients is non-negotiable.
FAQ
What is the guaranteed operating temperature range for the LTC3637MPDHC#PBF?
The LTC3637MPDHC#PBF is tested and guaranteed over a junction temperature range of –55°C to 150°C. This MP-grade qualification exceeds standard industrial and automotive grades, making it suitable for military, aerospace, and downhole oil/gas applications where extreme cold-start or high-ambient thermal environments are present. All electrical specifications in the datasheet apply across this full range.
How does the ISET pin configure maximum output current in the LTC3637MPDHC#PBF?
The ISET pin on the LTC3637MPDHC#PBF sets the peak inductor current limit via an external resistor to GND. A 100kΩ resistor yields ~1A peak current (500mA max average output), while shorting ISET to GND gives 240mA peak (120mA average). The relationship follows RISET = 140k·IPEAK – 24k, with IPEAK ranging from 240mA to 2.4A. This directly determines inductor size, output ripple, and efficiency trade-offs.
Can the LTC3637MPDHC#PBF operate with input voltage equal to output voltage?
Yes - the LTC3637MPDHC#PBF supports 100% duty cycle operation, enabling regulation even when VIN equals VOUT. This low-dropout capability is enabled by its P-channel MOSFET high-side switch, which remains fully enhanced down to VGS = 0V. During dropout, efficiency drops due to increased conduction loss in the 350mΩ switch, but regulation is maintained - critical for brownout resilience in automotive and industrial systems.
What is the purpose of the FBO pin on the LTC3637MPDHC#PBF?
The FBO (Feedback Comparator Output) pin on the LTC3637MPDHC#PBF is an open-drain flag that pulls low when the feedback voltage falls outside regulation (i.e., VFB < 0.792V or > 0.808V). With a typical 20µA pull-up and 70Ω pull-down, it provides a simple, real-time fault indicator for system monitoring - useful for watchdog circuits, status LEDs, or microcontroller interrupt signaling without additional sensing components.
Does the LTC3637MPDHC#PBF require external compensation components?
No - the LTC3637MPDHC#PBF uses internal compensation and requires no external RC networks for loop stability. Its hysteretic Burst Mode® architecture eliminates the need for traditional Type II or III compensation, reducing design complexity and component count. Stability is ensured across all valid input/output combinations and load conditions when using recommended external components (inductor, input/output capacitors, and ISET resistor).
LTC3637MPDHC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3637MPDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637MPDHC#PBF 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#PBF reliable?
The price and inventory of LTC3637MPDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637MPDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3637MPDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637MPDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637MPDHC#PBF?
LTC3637MPDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637MPDHC#PBF 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#PBF?
For technical support, including LTC3637MPDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637MPDHC#PBF requirements.
6.How does Aetrix verify that LTC3637MPDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3637MPDHC#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3637MPDHC#PBF?
All LTC3637MPDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637MPDHC#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3637MPDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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