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Analog Devices Inc. LT1374HVCR#PBF
- Part No.:
- LT1374HVCR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374HVCR#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
LT1374HVCR#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, 500kHz monolithic buck switching regulator with integrated 4.5A NPN power switch, 32V maximum input voltage rating, 0.07Ω typical switch on-resistance, and current-mode control architecture. It delivers up to 4.25A at 5V output in standard configurations and is used in industrial power supplies requiring robust overvoltage tolerance and thermal stability.
For engineers reviewing the LT1374HVCR#PBF datasheet, LT1374HVCR#PBF pinout, LT1374HVCR#PBF application, or LT1374HVCR#PBF equivalent, key selection criteria include its HV-rated input range (up to 32V), exposed-pad TSSOP-16 thermal performance, cycle-by-cycle current limiting, shutdown current of 30µA (max at 32V), and compatibility with external synchronization up to 1MHz.
Technical Context
The LT1374HVCR#PBF implements constant-frequency current-mode control using an internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the VC pin. Its bipolar NPN switch is driven via a BOOST pin that enables saturation-reducing conduction loss and achieving >89% efficiency at 5V/2A with VIN = 10V.
It features dual shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for full micropower shutdown, plus FB/SENSE pin functionality enabling foldback current limiting and frequency reduction below 1V feedback voltage. The device supports both fixed 5V (SENSE) and adjustable-output (FB) variants, with this part configured as the HV-rated version in 16-pin TSSOP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - Enables direct operation from 24V industrial rails without pre-regulation. |
| Switch Current Limit | 4.5A (typ) at ≤50% duty cycle - Sets hard current ceiling for inductor and diode sizing. |
| Switch On Resistance | 0.07Ω (typ) at ISW = 4.5A - Reduces conduction loss; yields ~315mW dissipation at full load. |
| Shutdown Supply Current | 30µA (max) at VIN ≤ 32V - Supports battery-backed standby modes with minimal drain. |
| Switching Frequency | 460–540kHz (typ 500kHz) - Enables compact 1.8–10µH inductors and low-profile ceramic output caps. |
| Feedback Reference | 2.42V (typ) - Defines output voltage accuracy; ±1.25% initial tolerance over temperature. |
| Thermal Resistance θJA | 30°C/W (with 0.5 sq in copper pad) - Requires PCB thermal land for sustained 4A operation. |
Pinout & Package
LT1374HVCR#PBF is housed in a 16-pin exposed-pad TSSOP package (FE16). The exposed thermal pad must be soldered to a dedicated ground plane for thermal management and EMI control. Pin functions are validated per Linear Technology's official FE16 package drawing and electrical characteristics table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Four dedicated GND pins minimize ground bounce; must be tied to low-impedance PCB ground plane. |
| VIN (Pins 3, 4) | Main input supply connection | Both pins must be shorted externally; carries high dI/dt switching current - requires local 100µF solid tantalum bypass. |
| BOOST (Pin 5) | Switch driver boost supply | Connects to external boost capacitor (e.g., 10nF) and diode; enables NPN saturation for low VCE(sat). |
| FB/SENSE (Pin 6) | Output voltage sensing input | For adjustable versions: connects to resistor divider; for -5 variants: direct 5V sense node (not applicable here). |
| VSW (Pins 10, 11) | Switch emitter output | Drives external catch diode and inductor; negative swing clamped to –0.8V - requires Schottky diode (e.g., MBRS330T3). |
| SYNC/SHDN (Pin 12) | Logic-level sync or shutdown control | Accepts 1.5–2.2V threshold signal; synchronizes oscillator from 580kHz to 1MHz or forces shutdown when pulled low. |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Used for loop compensation (RC network); also serves as current clamp point - drives external optocoupler in isolated designs. |
| BIAS (Pin 15) | Efficiency-boosting auxiliary supply | When tied to regulated output (≥3.3V), reduces VIN supply current by shifting bias power source - improves efficiency at high VIN. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Rating | 32V absolute max input - supports 24V nominal industrial and telecom systems with margin. |
| Current-Mode Control | Fast transient response and inherent loop stability - eliminates need for complex Type III compensation. |
| Cycle-by-Cycle Current Limiting | Hardware-based protection triggers within one switching cycle - prevents MOSFET/diode failure during overload. |
| Integrated BOOST Drive | Enables NPN saturation, reducing switch loss vs. conventional bipolar designs - improves efficiency by ≥14%. |
| Programmable Synchronization | External logic-level signal shifts frequency from 580kHz to 1MHz - avoids noise-sensitive bands and enables multi-rail phase interleaving. |
| Foldback Protection | Reduces switching frequency and current limit when FB voltage drops below 1V - limits power dissipation during short-circuit faults. |
Applications
| Industrial 24V DC-DC Conversion | Portable Medical Instrument Power |
|---|---|
|
Use Scenario: Converting unregulated 24V rail to stable 5V for microcontroller, sensor, and display subsystems in factory-floor equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing regulated 5V/4A output with UVLO and thermal shutdown. Use Value: 32V input rating eliminates need for upstream pre-regulator; exposed-pad TSSOP ensures reliable thermal performance in sealed enclosures. |
Use Scenario: Powering portable ultrasound or patient monitor modules where battery life and EMI sensitivity are critical. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from Li-ion (8.4V) or 12V adapter, delivering low-noise 3.3V/2A. Use Value: 20µA shutdown current extends battery runtime; current-mode control minimizes output ripple affecting analog front-ends. |
| Automotive Body Control Module (BCM) | Distributed Telecom Power |
|
Use Scenario: Generating 5V for CAN transceivers and microcontrollers in under-hood BCMs subject to load dump transients. IC Role / Device Role / Timing Role: Robust buck controller tolerant of 32V transients, with cycle-by-cycle current limiting for solenoid drive fault containment. Use Value: 0.07Ω switch RDS(on) reduces thermal stress during intermittent high-current loads (e.g., window lift motors). |
Use Scenario: Point-of-load regulation in 48V telecom shelves converting to 12V intermediate bus for downstream POL converters. IC Role / Device Role / Timing Role: High-frequency (500kHz) buck stage enabling small 5µH inductors and minimizing board area in dense line cards. Use Value: Synchronization capability allows alignment with other converters to reduce conducted EMI peaks in shared input filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 40V input, 3.5A integrated FET, 3mm × 4mm MSOP-16, 500kHz fixed frequency, no BOOST pin required | Lower current rating; uses MOSFET instead of bipolar switch - better light-load efficiency but higher cost | Preferred for space-constrained designs needing <4A and simplified layout (no BOOST cap/diode) |
| MP2451DT-LF-Z | 36V input, 0.6A integrated switch, SOIC-8, 500kHz, no BIAS/BOOST pins, lower cost | Not a drop-in replacement: lower current, no HV tolerance margin, no sync/shutdown flexibility | Suitable only for low-power auxiliary rails (<0.6A); not recommended for primary 5V/4A conversion |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, the LT1374HVCR#PBF uniquely combines 32V input tolerance, 4.5A switch capability, BOOST-driven bipolar efficiency, and synchronization - making it optimal for industrial 24V-to-5V conversion where reliability and thermal headroom are prioritized over ultra-small footprint.
Availability
LT1374HVCR#PBF is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1374HVCR#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 full technical and manufacturing continuity for the LT product family. Linear pioneered high-performance analog ICs with emphasis on precision, speed, and ruggedness.
The LT1374HVCR#PBF belongs to Linear's legacy high-voltage monolithic switching regulator product line, designed specifically for industrial and automotive applications demanding wide-input-range DC-DC conversion with integrated protection and thermal resilience.
FAQ
What is the maximum input voltage rating for the LT1374HVCR#PBF?
The LT1374HVCR#PBF has an absolute maximum input voltage rating of 32V, confirmed in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1374 (25V max) and enables direct use with 24V industrial rails including load-dump transients. Operation above 25V requires verification of BOOST pin voltage (≤38V) and thermal derating per θJA = 30°C/W specification.
Does the LT1374HVCR#PBF support external synchronization, and what is its range?
Yes, the LT1374HVCR#PBF supports external synchronization via the SYNC/SHDN pin (Pin 12), with a specified synchronizing range of 580kHz to 1MHz. The pin accepts logic-level signals (10–90% duty cycle) and replaces the shutdown function when enabled. This capability is validated in the Electrical Characteristics table under "Synchronizing Range" and "SYNC Pin Input Resistance" (40kΩ).
What is the purpose of the BOOST pin on the LT1374HVCR#PBF, and how is it implemented?
The BOOST pin (Pin 5) provides a voltage higher than VIN to saturate the internal NPN power switch, reducing conduction loss. It is implemented using an external flying capacitor (e.g., 10nF) and Schottky diode (e.g., FMMD914) connected between VIN and BOOST. This topology achieves a typical switch on-resistance of 0.07Ω - confirmed in the Electrical Characteristics table - and improves efficiency to >89% at 5V/2A, versus ~75% in conventional bipolar designs.
How does the LT1374HVCR#PBF handle short-circuit protection?
The LT1374HVCR#PBF employs dual-layer short-circuit protection: (1) cycle-by-cycle current limiting (4.5A typical peak switch current), and (2) feedback pin (FB) foldback - reducing switching frequency and current limit when FB voltage drops below 1V. This is documented in the Applications Information section and verified in Typical Performance Characteristics graphs (e.g., "Frequency Foldback"). The combination limits power dissipation in both IC and external components during sustained faults.
Is the LT1374HVCR#PBF pin-compatible with other LT1374 variants like LT1374CR or LT1374IR?
No, the LT1374HVCR#PBF is not pin-compatible with LT1374CR (7-pin DD) or LT1374IR (TO-220), as it uses the 16-pin FE16 (TSSOP) package with distinct pin mapping - including dual VIN, dual VSW, and dedicated BIAS/NC pins. Even among TSSOP variants, HV versions share the same FE16 footprint but require validation of BOOST voltage margins and thermal pad layout per Linear's AN83 guidelines.
LT1374HVCR#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 32V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 27.52V
- Current - Output:
- 4.5A (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1374HVCR#PBF FAQ
1.How can I place an order for LT1374HVCR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVCR#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 LT1374HVCR#PBF reliable?
The price and inventory of LT1374HVCR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVCR#PBF is usually 5 days.
3.What payment methods are accepted for LT1374HVCR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVCR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVCR#PBF?
LT1374HVCR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVCR#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 LT1374HVCR#PBF?
For technical support, including LT1374HVCR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVCR#PBF requirements.
6.How does Aetrix verify that LT1374HVCR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVCR#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 LT1374HVCR#PBF meets industry standards.
7.What is the process for return or replacement of LT1374HVCR#PBF?
All LT1374HVCR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVCR#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 LT1374HVCR#PBF part is unused and in its original packaging.
Return procedure for LT1374HVCR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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