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Analog Devices Inc. LTC3637HDHC#TRPBF
- Part No.:
- LTC3637HDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3637HDHC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,655
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Product details
Overview
LTC3637HDHC#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input 76V step-down DC/DC regulator with integrated 350mΩ high-side P-channel MOSFET, programmable 100mA–1A output current, 12µA no-load quiescent current, and –40°C to 150°C operating junction temperature range. It delivers regulated power in industrial control supplies, avionics, and battery-operated systems requiring robust input voltage handling.
For engineers reviewing the LTC3637HDHC#TRPBF datasheet, LTC3637HDHC#TRPBF pinout, LTC3637HDHC#TRPBF application, or LTC3637HDHC#TRPBF equivalent, key selection considerations include its 4V–76V input range, 0.8V–VIN adjustable output, programmable peak current limit via ISET, Burst Mode® operation for ultra-low IQ, and thermal-enhanced 16-lead 5mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3637HDHC#TRPBF implements a hysteretic Burst Mode® control architecture with internal P-channel high-side switch, enabling 100% duty cycle low-dropout operation and inherent short-circuit protection. Its feedback loop compares VFB against a precise 0.800V ±1% reference and uses VPRG1/VPRG2 pins to select fixed 1.8V/3.3V/5V outputs or enable external resistor-divider programming.
Startup is managed by a precise RUN pin threshold (1.21V rising, 1.10V falling, 110mV hysteresis), internal 0.8ms soft-start, and optional external SS capacitor ramp control. Overvoltage lockout (OVLO) is set via external resistor divider, disabling switching when OVLO > 1.21V and resuming at < 1.10V - triggering soft-start reset for graceful transient recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 24V/48V industrial buses, automotive batteries, and PoE-derived rails. |
| Output Voltage Range | 0.8V to VIN - enables both low-voltage logic supplies and near-input regulation for dropout-critical applications. |
| Max Output Current | 1A average - limited by programmable peak current (0.24A–2.4A); max average = 50% of peak due to hysteretic control. |
| Quiescent Current | 12µA in Burst Mode sleep - sustains regulation with minimal battery drain in always-on portable or remote sensor systems. |
| Feedback Reference | 0.800V ±1% - provides tight output accuracy across temperature; line regulation 0.001%/V ensures stability over wide VIN. |
| Package Thermal Resistance | θJA = 43°C/W, θJC = 5°C/W - exposed pad (Pin 17) must be soldered to PCB ground plane for reliable 150°C junction operation. |
| Junction Temp Range | –40°C to 150°C - qualified for harsh environments including avionics, under-hood automotive, and industrial motor drives. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connects to inductor; carries pulsed high-side switch current; requires low-inductance layout to minimize EMI and voltage spikes. |
| VIN (3) | Main Input Supply | Accepts 4V–76V; bypass capacitor required between VIN and GND for stable switching and EMI suppression. |
| FBO (5) | Feedback Comparator Output | Open-drain flag indicating feedback comparator state; 20µA pull-up, 70Ω pull-down - used for fault monitoring or sequencing. |
| VPRG1/VPRG2 (6,7) | Output Voltage Selection | Configure fixed 1.8V/3.3V/5V or adjustable mode; tied to SS or GND per table - 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; compared to 0.800V reference - accuracy directly determines output regulation tolerance. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); internal 0.8ms default - prevents input droop during startup. |
| ISET (11) | Peak Current Programming | Resistor-to-GND sets peak inductor current (0.24A–2.4A); 5µA current source - defines max output capability and ripple trade-off. |
| OVLO (12) | Overvoltage Lockout | Resistor-divider input; disables switching above 1.21V - protects downstream circuitry from input transients or supply faults. |
| RUN (14) | Enable/Shutdown Control | 1.21V threshold enables operation; <0.7V forces 3µA shutdown - enables precise undervoltage lockout or system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains regulation at light loads with only 12µA IQ, eliminating need for external bias supplies in battery-powered systems. |
| Programmable Peak Current Limit | Adjustable 0.24A–2.4A via single ISET resistor - optimizes inductor/capacitor size and output ripple without redesigning control loop. |
| No Compensation Required | Internally compensated hysteretic architecture - reduces BOM count and eliminates stability tuning effort for standard applications. |
| Low-Dropout 100% Duty Cycle | P-channel high-side switch enables VIN–VOUT < 100mV regulation - critical for maintaining output during brownout or low-input conditions. |
| Precision RUN Threshold & Hysteresis | 1.21V rising / 1.10V falling with 110mV hysteresis - ensures clean, bounce-free enable/disable behavior in noisy industrial environments. |
Applications
| Industrial Control Supplies | Avionics Power Systems |
|---|---|
Use Scenario: Regulating 24V or 48V factory bus to 3.3V/5V for PLC I/O modules, sensors, and fieldbus transceivers. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering tightly regulated logic and analog supply rails. Use Value: 76V max input withstands load-dump transients; 12µA IQ extends uptime in unpowered standby modes. | Use Scenario: Converting 28V aircraft bus to 1.8V/3.3V for flight control computers and inertial measurement units (IMUs). IC Role / Device Role / Timing Role: High-reliability point-of-load regulator meeting DO-160 lightning-induced transient requirements. Use Value: –40°C to 150°C rating supports operation in pressurized and unpressurized bays; OVLO prevents damage from generator surges. |
| Portable Test Instruments | Battery-Operated Medical Devices |
Use Scenario: Powering handheld oscilloscopes and multimeters from Li-ion (8.4V–12.6V) or 9V alkaline packs. IC Role / Device Role / Timing Role: Efficient main DC/DC stage converting variable battery voltage to stable 5V/3.3V system rail. Use Value: 12µA IQ preserves battery life during idle; programmable ISET allows smaller magnetics for compact form factor. | Use Scenario: Supplying 1.8V core and 3.3V peripheral rails for portable ECG monitors and infusion pumps. IC Role / Device Role / Timing Role: Low-noise, low-IQ power management IC ensuring long runtime and regulatory compliance. Use Value: Precise 0.800V reference and <1% FB tolerance guarantee ADC/DAC reference stability; 150°C rating accommodates sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3637IDHC#TRPBF | Same pinout and features, but rated for –40°C to 125°C junction temperature (vs. 150°C for LTC3637HDHC#TRPBF). | Suitable for commercial/industrial ambient environments where extended high-temp operation is not required. | Select LTC3637IDHC#TRPBF when 125°C max junction suffices and cost optimization is prioritized. |
| LTC3637HMSE#TRPBF | Identical electrical specs and temp grade (–40°C to 150°C), but in 16-lead MSOP package (θJA = 45°C/W vs. 43°C/W for DFN). | Preferred where higher creepage/clearance is needed for >60V applications or legacy MSOP footprint compatibility exists. | Choose LTC3637HMSE#TRPBF if board layout requires MSOP or high-voltage isolation distances exceed DFN capabilities. |
Compared with LTC3637IDHC#TRPBF, the LTC3637HDHC#TRPBF offers 25°C higher maximum junction temperature for sustained operation in thermally constrained enclosures; versus LTC3637HMSE#TRPBF, it delivers marginally better thermal performance in space-constrained layouts due to lower θJA and smaller DFN footprint.
Availability
LTC3637HDHC#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power systems, and portable test instruments requiring stable component supply across extended temperature and high-reliability applications.
Supply support for LTC3637HDHC#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, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3637 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for rugged, wide-input industrial, aerospace, and medical applications where reliability across extreme temperature and input voltage ranges is mandatory.
FAQ
What is the maximum input voltage rating for the LTC3637HDHC#TRPBF?
The LTC3637HDHC#TRPBF has an absolute maximum input voltage rating of 80V, with guaranteed continuous operation from 4V to 76V. Operation beyond 76V is not specified and may cause permanent damage or degraded reliability. The device includes internal overvoltage lockout (OVLO) that can be configured via external resistor divider to disable switching before reaching the absolute maximum, enhancing system safety.
How does the ISET pin on the LTC3637HDHC#TRPBF control output current?
The ISET pin on the LTC3637HDHC#TRPBF sources a 5µA current (reduced to 1µA in sleep mode) that flows through an external resistor to ground, generating a voltage that sets the peak inductor current threshold. This threshold directly determines maximum average output current - which equals half the peak current due to the hysteretic control architecture. For example, a 100kΩ resistor yields ~1A peak current and thus ~500mA max average output.
Can the LTC3637HDHC#TRPBF operate with 100% duty cycle, and what is the significance?
Yes, the LTC3637HDHC#TRPBF supports 100% duty cycle operation using its internal P-channel high-side MOSFET. This enables low-dropout regulation when input voltage approaches output voltage - critical for maintaining system functionality during brownout events or low-battery conditions. At 100% duty cycle, the switch remains continuously on, delivering current limited only by the programmed peak current and MOSFET RDS(ON) (350mΩ typical).
What is the purpose of the FBO pin on the LTC3637HDHC#TRPBF?
The FBO (Feedback Comparator Output) pin on the LTC3637HDHC#TRPBF is an open-drain output that signals the state of the internal feedback comparator. When the output voltage falls below regulation (VFB < 0.795V), FBO pulls low; otherwise, it remains high-impedance. With a 20µA internal pull-up and 70Ω pull-down, FBO enables external fault monitoring, power-good indication, or sequencing with other regulators without additional comparators.
Does the LTC3637HDHC#TRPBF require external compensation components?
No, the LTC3637HDHC#TRPBF does not require external compensation components. Its hysteretic Burst Mode® control architecture is internally compensated, eliminating the need for loop-stability capacitors or resistors. This simplifies design, reduces bill-of-materials count, and removes tuning effort - making it ideal for rapid prototyping and space-constrained applications where layout simplicity is essential.
LTC3637HDHC#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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3637HDHC#TRPBF FAQ
1.How can I place an order for LTC3637HDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637HDHC#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 LTC3637HDHC#TRPBF reliable?
The price and inventory of LTC3637HDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637HDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3637HDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637HDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637HDHC#TRPBF?
LTC3637HDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637HDHC#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 LTC3637HDHC#TRPBF?
For technical support, including LTC3637HDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637HDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3637HDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3637HDHC#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 LTC3637HDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3637HDHC#TRPBF?
All LTC3637HDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637HDHC#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 LTC3637HDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3637HDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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