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Analog Devices Inc. LTC3637HDHC#PBF
- Part No.:
- LTC3637HDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3637HDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LTC3637HDHC#PBF from Analog Devices (formerly Linear Technology) is a 76V input, 1A synchronous step-down DC/DC regulator with integrated 350mΩ high-side PMOS switch, 12µA no-load quiescent current, and programmable peak current limit (0.24A–2.4A). It operates across 4V–76V input, delivers 0.8V–VIN output, and supports fixed 1.8V/3.3V/5V or adjustable regulation - used in industrial control supplies and avionics power rails where wide VIN and low IQ are critical.
For engineers reviewing the LTC3637HDHC#PBF datasheet, LTC3637HDHC#PBF pinout, LTC3637HDHC#PBF application, or LTC3637HDHC#PBF equivalent, this page delivers verified package mapping (16-lead 5mm×3mm DFN), thermal specs (TJMAX = 150°C, θJA = 43°C/W), Burst Mode® operation details, precise RUN/OVLO thresholds, and confirmed alternative parts for high-reliability 76V buck designs.
Technical Context
The LTC3637HDHC#PBF implements hysteretic Burst Mode® control with internal 0.8V ±1% feedback reference and programmable peak current comparator (set via ISET pin resistor). Its P-channel high-side switch enables 100% duty-cycle dropout operation and inherent short-circuit protection through reverse-current detection.
It integrates precision RUN pin threshold (1.21V rising, 1.10V falling, 110mV hysteresis), programmable OVLO (1.21V trip), and dual soft-start (internal 0.8ms or external capacitor-controlled). Input undervoltage lockout (UVLO) activates at 3.45V (rising) with 150mV hysteresis, and thermal shutdown triggers at ~180°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 48V telecom, 60V industrial, or 72V battery systems without pre-regulation. |
| Max Output Current | 1A average - limited to half the programmable peak current (0.24A–2.4A), enabling optimized inductor/capacitor sizing. |
| Quiescent Current | 12µA in Burst Mode sleep - sustains >10-year battery life in always-on remote sensors or avionics standby rails. |
| Feedback Reference | 0.800V ±1% - enables accurate 0.8V–VIN output with minimal external divider error sensitivity. |
| Switch RDS(on) | 350mΩ typical - limits conduction loss at 1A to <350mW, critical for thermally constrained DFN layouts. |
| Operating Temperature | –40°C to +150°C junction - qualified for under-hood automotive, downhole tools, and military avionics environments. |
| Package Thermal Resistance | θJA = 43°C/W, θJC = 5°C/W - exposed pad (Pin 17) must be soldered to PCB ground for thermal integrity. |
Pinout & Package
16-lead (5mm × 3mm) plastic DFN package with exposed GND pad (Pin 17). Requires soldering exposed pad to PCB ground plane for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor and catch diode anode; carries pulsed high-side switch current up to 2.4A peak. |
| VIN (3) | Main input supply | Accepts 4V–76V; requires local ceramic bypass capacitor to suppress switching noise and supply transients. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating VFB error condition; 20µA pull-up, 70Ω pull-down for fault signaling. |
| VPRG1/VPRG2 (6,7) | Output voltage selection | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or connecting to SS pin per datasheet table. |
| GND (8,16,17) | Ground reference | Pins 8/16 are signal GND; Pin 17 is thermal pad - all must connect to low-impedance PCB ground plane. |
| VFB (9) | Feedback input | Monitors divided output voltage against 0.8V reference; 10nA max input bias enables high-resistor-divider designs. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); internal 0.8ms default ensures controlled startup without input droop. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak current (0.24A–2.4A); 5µA current source enables precise, temperature-stable adjustment. |
| OVLO (12) | Overvoltage lockout | Resistive divider from VIN sets disable threshold (1.21V trip); prevents damage during input surges above 76V. |
| RUN (14) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces 3µA shutdown - supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Internal loop compensation eliminates external RC networks - reduces BOM count and layout sensitivity. |
| Programmable peak current limit | Adjustable 0.24A–2.4A via single ISET resistor - optimizes efficiency, ripple, and component size for specific load profiles. |
| Burst Mode® operation | Maintains >80% efficiency at 1mA load while drawing only 12µA - extends battery life without sacrificing light-load regulation. |
| Precision RUN and OVLO thresholds | 110mV hysteresis on both pins ensures glitch-free enable/disable during noisy input transients in industrial environments. |
| 100% duty-cycle dropout | P-channel high-side switch sustains regulation down to VIN = VOUT - essential for brownout recovery in automotive start-stop systems. |
Applications
| Industrial Control Supplies | Avionics Power Rails |
|---|---|
Use Scenario: Regulating 24V/48V plant-floor bus to 3.3V/5V for PLC I/O modules and sensor interfaces operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering stable, low-noise logic supply with UVLO/OVLO protection against factory power disturbances. Use Value: 12µA quiescent current prevents thermal runaway in sealed enclosures; 76V rating handles 48V+ surge events per IEC 61000-4-5. |
Use Scenario: Generating 5V and 3.3V from 28V aircraft bus for flight control computers and inertial measurement units (IMUs). IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with 150°C junction rating and robust overtemperature shutdown (180°C trip). Use Value: MSE/DHN package thermal performance (θJA = 43°C/W) meets DO-160E thermal dissipation requirements for avionics mounting density. |
| Medical Imaging Subsystems | Battery-Operated Test Equipment |
Use Scenario: Powering FPGA-based image processing boards in portable ultrasound devices using 12V–72V Li-ion battery packs. IC Role / Device Role / Timing Role: Efficient 1A buck stage converting variable battery voltage to fixed 1.8V core rail with precise soft-start to avoid inrush-induced reset. Use Value: Adjustable output (0.8V–VIN) and 0.8V reference enable tight tolerance on low-voltage digital rails critical for ADC/DAC accuracy. |
Use Scenario: Supplying 5V to handheld multimeters and oscilloscope front-ends powered by 4×AA alkaline cells (6V fresh, 4V depleted). IC Role / Device Role / Timing Role: Wide-input buck regulator maintaining regulation across full battery discharge curve with ultra-low IQ to maximize runtime. Use Value: 4V minimum input and 12µA sleep current extend usable battery life beyond 500 hours in low-duty-cycle measurement modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609S | 42V max VIN, 2.5A output, 2.5µA IQ, Silent Switcher® architecture - lower voltage rating but superior EMI performance. | Suitable for 24V/36V systems requiring ultra-low noise; not viable for 48V+ or 76V inputs. | Select LT8609S when EMI compliance (CISPR 22 Class B) is mandatory and input stays ≤42V. |
| LM5164QPWPRQ1 | 100V max VIN, 1A output, 14µA IQ, integrated bootstrap diode - wider VIN but higher 350mΩ RDS(on) and no programmable peak current. | Automotive AEC-Q100 qualified; lacks precision RUN/OVLO thresholds and Burst Mode® efficiency at microamp loads. | Choose LM5164QPWPRQ1 for automotive-grade 100V designs where AEC-Q100 certification is required over ultra-low IQ. |
Compared with LT8609S and LM5164QPWPRQ1, the LTC3637HDHC#PBF uniquely balances 76V operation, 12µA IQ, programmable peak current, and precision enable/lockout thresholds - making it optimal for industrial and avionics applications demanding both wide input range and microamp standby.
Availability
LTC3637HDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power rails, medical imaging subsystems, and battery-operated test equipment requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LTC3637HDHC#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog ICs for precision power, signal conditioning, and timing applications.
The LTC3637HDHC#PBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for ruggedized power conversion in industrial, aerospace, and medical systems where input transients, wide temperature ranges, and ultra-low quiescent current are critical.
FAQ
What is the maximum input voltage rating for the LTC3637HDHC#PBF?
The LTC3637HDHC#PBF has an absolute maximum input voltage rating of 80V, with guaranteed operation across 4V to 76V. This allows direct regulation from 48V, 60V, or 72V sources without external pre-regulation - critical for industrial and avionics applications where input transients exceed standard 40V buck limits. Operation above 76V risks permanent damage even if within the 80V absolute max.
How does the ISET pin configure peak current in the LTC3637HDHC#PBF?
The ISET pin on the LTC3637HDHC#PBF sources a precise 5µA current (reduced to 1µA in sleep mode) that develops a voltage across an external resistor to ground, setting the peak current comparator threshold. A 100kΩ resistor yields ~1A peak current (0.5A average), while floating ISET gives 2.4A peak (1.2A average). The relationship follows RISET = 140k·IPEAK – 24k, validated across temperature and input voltage.
Does the LTC3637HDHC#PBF support fixed-output voltages without external resistors?
Yes, the LTC3637HDHC#PBF supports factory-programmed fixed outputs of 1.8V, 3.3V, or 5V using only VPRG1 and VPRG2 pin connections - no external feedback resistors needed. Shorting VPRG1 to SS and VPRG2 to GND configures 5V; VPRG1 to GND and VPRG2 to SS selects 3.3V; both to SS sets 1.8V. This reduces component count, noise susceptibility, and layout area versus adjustable mode.
What thermal considerations apply to the LTC3637HDHC#PBF in its DFN package?
The LTC3637HDHC#PBF in the 5mm×3mm DFN package has θJA = 43°C/W and θJC = 5°C/W, requiring the exposed GND pad (Pin 17) to be soldered to a large PCB copper area for heat dissipation. At 1A load and 76V input, power dissipation can exceed 1.5W - adequate copper pour and airflow are essential to maintain junction temperature ≤150°C. Derating is required above 125°C ambient.
Can the LTC3637HDHC#PBF operate in 100% duty cycle dropout mode?
Yes, the LTC3637HDHC#PBF uses a P-channel high-side MOSFET enabling true 100% duty cycle operation. When VIN approaches VOUT, the switch remains continuously on, sustaining regulation down to VIN = VOUT. This is vital for automotive start-stop recovery and brownout resilience - but power dissipation rises sharply below 10V VIN due to increased RDS(on) and output current.
LTC3637HDHC#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3637HDHC#PBF FAQ
1.How can I place an order for LTC3637HDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637HDHC#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 LTC3637HDHC#PBF reliable?
The price and inventory of LTC3637HDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637HDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3637HDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637HDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637HDHC#PBF?
LTC3637HDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637HDHC#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 LTC3637HDHC#PBF?
For technical support, including LTC3637HDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637HDHC#PBF requirements.
6.How does Aetrix verify that LTC3637HDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3637HDHC#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 LTC3637HDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3637HDHC#PBF?
All LTC3637HDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637HDHC#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 LTC3637HDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3637HDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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