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Analog Devices Inc. LTC3637EDHC#PBF
- Part No.:
- LTC3637EDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3637EDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,463
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Product details
Overview
LTC3637EDHC#PBF from Analog Devices (formerly Linear Technology) is a 76V input, 1A synchronous step-down DC/DC regulator with integrated 350mΩ high-side P-MOSFET, 12µA no-load quiescent current, and programmable peak current limit (100mA–1A). It operates from 4V to 76V input, delivers 0.8V to VIN output, and supports fixed 1.8V/3.3V/5V or adjustable regulation-ideal for industrial control supplies and battery-operated avionics.
For engineers reviewing the LTC3637EDHC#PBF datasheet, LTC3637EDHC#PBF pinout, LTC3637EDHC#PBF application, or LTC3637EDHC#PBF equivalent, key selection criteria include its 76V max input rating, 12µA sleep-mode current, programmable IPEAK via ISET resistor, Burst Mode® efficiency at light loads, and compatibility with 3mm × 5mm DFN thermal layout requirements.
Technical Context
The LTC3637EDHC#PBF implements a hysteretic Burst Mode® control architecture with internal P-channel MOSFET switch, eliminating external compensation. Its feedback comparator uses a precise 0.800V ±1% reference and supports four output configurations via VPRG1/VPRG2 pin strapping.
Start-up is controlled by a 1.21V RUN threshold with 110mV hysteresis and an internal 0.8ms soft-start; external SS capacitor extends ramp time. Overvoltage lockout (OVLO) is set via resistor divider with 1.21V trip and 110mV hysteresis, while UVLO activates below 3.5V typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports wide-range industrial, automotive, and avionic power buses including 24V, 48V, and 72V systems. |
| Max Output Current | 1A average - derived from 2.4A typical peak current limit; programmable down to 100mA average via ISET resistor. |
| Quiescent Current | 12µA in sleep mode - enables multi-year battery life in always-on portable instruments and remote sensors. |
| Feedback Reference | 0.800V ±1% - enables accurate output regulation across temperature; supports 0.8V–VIN adjustable range. |
| Package | 16-lead 3mm × 5mm DFN (DHC) with exposed GND pad - provides θJA = 43°C/W for high-power-density thermal management. |
| Switch RDS(on) | 350mΩ - limits conduction loss at 1A; enables >90% efficiency at mid-load with 12V→5V conversion. |
| Soft-Start | Internal 0.8ms + external capacitor option - prevents input droop during cold-start in distributed power systems. |
Pinout & Package
Package: 16-lead plastic DFN (3mm × 5mm, 0.75mm height), exposed thermal pad (Pin 17) soldered to PCB GND plane per θJC = 5°C/W spec.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; carries full switching current; requires low-inductance layout to minimize EMI. |
| VIN (3) | Main input supply | Accepts 4V–76V; must be bypassed with ceramic capacitor close to pin for stability. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating regulation status; 20µA pull-up, 70Ω pull-down for system monitoring. |
| VPRG1/VPRG2 (6,7) | Output voltage select | Strap to GND/SS to configure 1.8V/3.3V/5V fixed or adjustable mode; eliminates external resistors for common outputs. |
| GND (8,16,17) | Ground reference & thermal path | Pins 8/16 are signal GND; Pin 17 is exposed thermal pad - must be soldered to PCB ground plane. |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; connects to resistor divider in adjustable mode or directly to VOUT in fixed mode. |
| SS (10) | Soft-start control | Capacitor to GND sets output ramp time (1ms per 16.5nF); internal 0.8ms default if floating. |
| ISET (11) | Peak current programming | Resistor to GND sets peak current (240mA–2.4A typical); determines max output current and component sizing. |
| OVLO (12) | Overvoltage lockout input | Resistor divider sets disable threshold (1.21V trip); ensures safe shutdown during input transients >76V. |
| RUN (14) | Enable/disable control | 1.21V enable threshold with 110mV hysteresis; <0.7V forces 3µA shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 12µA no-load IQ while delivering regulated output - critical for energy-harvesting and battery-backed systems. |
| Programmable peak current limit | Adjustable 100mA–1A output via single ISET resistor - optimizes inductor/capacitor size and light-load ripple without redesign. |
| No external compensation required | Internally compensated hysteretic control - reduces BOM count and layout sensitivity vs. voltage-mode controllers. |
| 100% duty cycle dropout operation | Supports VIN → VOUT regulation down to 4V - enables seamless transition in brownout conditions for medical devices. |
| Precision RUN/OVLO thresholds | 1.21V ±10mV enable and lockout points - allows accurate input voltage windowing for automotive and avionic power sequencing. |
Applications
| Industrial Control Supplies | Avionics Power Regulation |
|---|---|
Use Scenario: Regulating unregulated 28V aircraft bus to 5V for flight data recorders and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator with input overvoltage protection and precise RUN threshold for power sequencing. Use Value: Withstands 76V transients per DO-160 Section 22, maintains 12µA sleep current during standby, and ensures clean start-up via programmable soft-start. | Use Scenario: Converting 72V military vehicle battery to 3.3V for FPGA configuration and communication modules. IC Role / Device Role / Timing Role: High-input-voltage buck converter with programmable OVLO to reject load-dump spikes above 65V. Use Value: 76V absolute max rating and 1.21V OVLO threshold enable robust operation in harsh vehicular environments without external TVS clamping. |
| Portable Medical Instruments | Battery-Operated Test Equipment |
Use Scenario: Powering handheld ultrasound units from dual-cell Li-ion (6V–8.4V) with ultra-low standby drain. IC Role / Device Role / Timing Role: Efficient 1A buck regulator with 12µA sleep current and 0.8V reference for precision analog circuitry. Use Value: Extends battery life beyond 5 years in always-on monitoring mode while maintaining ±1% output accuracy over temperature. | Use Scenario: Supplying 1.8V core voltage to microcontrollers in field-deployable multimeters powered by AA batteries. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting 1.8V/3.3V/5V via pin strapping to reduce firmware complexity. Use Value: Eliminates need for external feedback resistors in fixed-output configurations, reducing PCB area and assembly cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3637IMSE#PBF | Same electrical specs; packaged in 16-lead MSOP (5mm × 4.4mm) with θJA = 45°C/W - slightly lower thermal performance than DFN. | Preferred where MSOP footprint is already established; less suitable for high-power-density layouts requiring minimal board area. | Select when existing PCB layout uses MSOP or when creepage/clearance >0.3mm at high voltage is required (per Note 6). |
| LT8609S#PBF | 42V max input, 2.5A output, 2.5µA IQ, Silent Switcher® architecture - lower input voltage range but superior EMI performance and higher current capability. | Better suited for noise-sensitive applications (e.g., RF front-ends) and systems needing >1A output; not viable for 72V bus designs. | Choose for sub-42V inputs where EMI compliance is critical or when >1A continuous load is required. |
Compared with LTC3637IMSE#PBF, the LTC3637EDHC#PBF offers 5% lower thermal resistance and 15% smaller footprint; versus LT8609S#PBF, it trades EMI performance for 80% higher input voltage tolerance and direct 76V transient survivability.
Availability
LTC3637EDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power regulation, and portable medical instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3637EDHC#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) acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear-branded power ICs.
The LTC3637 belongs to ADI's high-voltage monolithic buck regulator family, designed specifically for ruggedized power conversion in industrial, aerospace, and transportation systems where input transients exceed 60V.
FAQ
What is the maximum input voltage rating for the LTC3637EDHC#PBF?
The LTC3637EDHC#PBF has an absolute maximum input voltage rating of 80V and a specified operating input range of 4V to 76V. It is designed to withstand 76V continuous operation and transient overvoltages up to 80V without damage, making it suitable for 48V and 72V industrial and vehicular power buses.
How does the ISET pin on the LTC3637EDHC#PBF control output current?
The ISET pin on the LTC3637EDHC#PBF sources a 5µA current (1µA in sleep mode) that develops a voltage across an external resistor to ground, setting the peak inductor current threshold. This directly determines the maximum average output current - e.g., a 100kΩ resistor programs ~1A peak, yielding ~500mA average output. The LTC3637EDHC#PBF datasheet Figure 2 provides exact RISET values.
Can the LTC3637EDHC#PBF operate in 100% duty cycle dropout mode?
Yes, the LTC3637EDHC#PBF supports 100% duty cycle operation using its internal P-channel MOSFET high-side switch. When input voltage approaches output voltage, the controller maintains regulation by holding the switch continuously on - enabling stable output down to VIN = 4V, which is essential for brownout resilience in medical and avionic systems.
What package type and thermal characteristics apply to the LTC3637EDHC#PBF?
The LTC3637EDHC#PBF uses a 16-lead 3mm × 5mm plastic DFN package (DHC) with exposed thermal pad (Pin 17). Its thermal resistance is θJA = 43°C/W and θJC = 5°C/W when the exposed pad is soldered to a 4-layer PCB with 1-in² copper pour, enabling reliable 1A operation at 125°C junction temperature.
Does the LTC3637EDHC#PBF require external compensation components?
No, the LTC3637EDHC#PBF uses an internally compensated hysteretic control architecture and requires no external compensation components. Its Burst Mode® operation and fixed-frequency-free design eliminate loop stability concerns, reducing design risk and component count - a key advantage over traditional voltage-mode buck controllers.
LTC3637EDHC#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3637EDHC#PBF FAQ
1.How can I place an order for LTC3637EDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637EDHC#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 LTC3637EDHC#PBF reliable?
The price and inventory of LTC3637EDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637EDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3637EDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637EDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637EDHC#PBF?
LTC3637EDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637EDHC#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 LTC3637EDHC#PBF?
For technical support, including LTC3637EDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637EDHC#PBF requirements.
6.How does Aetrix verify that LTC3637EDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3637EDHC#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 LTC3637EDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3637EDHC#PBF?
All LTC3637EDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637EDHC#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 LTC3637EDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3637EDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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