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Analog Devices Inc. LT1374HVCR#TRPBF
- Part No.:
- LT1374HVCR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374HVCR#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,620
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Product details
Overview
LT1374HVCR#TRPBF 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, cycle-by-cycle current limiting, and shutdown capability drawing only 30µA typical supply current. It delivers regulated 5V output up to 4.25A in fixed-output configuration and supports external synchronization up to 1MHz for noise-sensitive systems.
For engineers reviewing the LT1374HVCR#TRPBF datasheet, LT1374HVCR#TRPBF pinout, LT1374HVCR#TRPBF application, or LT1374HVCR#TRPBF equivalent, this page provides verified technical context, validated package mapping to 16-pin TSSOP with exposed pad, confirmed pin functions including BOOST, SHDN, and VC, and real-world design implications of its current-mode control, slope compensation, and thermal shutdown behavior.
Technical Context
The LT1374HVCR#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator, error amplifier with 2000µMho transconductance, and peak-current comparator referenced to the VC pin. Its bipolar NPN switch is driven via the BOOST pin to achieve saturation-reducing conduction loss to ~0.07Ω at 4.5A-and enabling >89% efficiency at 5V/4.25A with VIN = 10V.
It features dual shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for micropower shutdown, plus frequency foldback below 1V FB/SENSE voltage and current limit reduction below 1.7V to manage short-circuit power dissipation. Slope compensation ensures stability across 50–90% duty cycles without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - supports wide industrial and automotive input rails; minimum start-up voltage is 5.5V. |
| Switching Frequency | 460–540kHz (typ. 500kHz) - enables compact 1.8–10µH inductors; synchronizable to 580–1000kHz. |
| Output Current Capability | Up to 4.25A at 5V - limited by 4.5A switch peak current and duty-cycle-dependent derating (e.g., 4.3A at 62.5% DC). |
| Switch On-Resistance | 0.07Ω (typ.) at 4.5A - achieved via BOOST-driven saturation; reduces conduction loss vs. standard bipolar designs. |
| Feedback Reference Voltage | 5.0V ±1.2% (fixed 5V version) - SENSE pin directly monitors output; no external divider required. |
| Shutdown Supply Current | 30µA (typ.) at VIN ≤ 32V - enables battery-powered standby operation with minimal drain. |
| Thermal Protection | Internal thermal shutdown - activates at TJ ≥ 125°C; auto-recovery after cooldown. |
Pinout & Package
LT1374HVCR#TRPBF is housed in a 16-pin TSSOP package (FE16) with exposed thermal pad. The package supports high-power dissipation (θJA = 30°C/W with 0.5 in² copper area) and requires soldering the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Four dedicated GND pins minimize ground impedance; must be connected to low-inductance ground plane to ensure load regulation and EMI control. |
| VIN (Pins 3, 4) | Input power supply connection | Dual VIN pins reduce trace inductance; must be decoupled locally with low-ESR capacitor near both pins. |
| BOOST (Pin 5) | Switch driver boost voltage node | Requires external capacitor + diode to generate ~VIN+5V; enables NPN saturation and <0.1Ω RCE(sat). |
| FB/SENSE (Pin 6) | Output voltage sensing input | Fixed 5V version uses SENSE function - direct connection to VOUT; enables accurate regulation without external resistors. |
| SHDN (Pin 13) | Shutdown control input | Logic-compatible input: <0.4V forces micropower shutdown (30µA); >2.38V enables UVLO protection. |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Provides access to control loop; used for compensation, current clamping, or override; swings 0.9–2.1V under load. |
| BIAS (Pin 15) | Efficiency-boosting bias supply | Connect to regulated output (≥3.3V) to source internal bias current externally - improves efficiency at high VIN/light loads. |
| VSW (Pins 10, 11) | Switch emitter output | Dual VSW pins carry full inductor current; must be routed with low inductance and clamped with catch diode to −0.8V max. |
| SYNC (Pin 12) | External oscillator synchronization input | Replaces SHDN on -SYNC variants; accepts 10–90% duty-cycle logic signal; extends frequency range to 1MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology with slope compensation | Enables stable operation across full duty cycle range (50–90%) without external compensation network. |
| Integrated 4.5A NPN power switch with BOOST drive | Eliminates need for external MOSFET and gate driver; achieves 0.07Ω effective on-resistance at full load. |
| Programmable shutdown and UVLO thresholds | Separate 0.4V (shutdown) and 2.38V (UVLO) thresholds allow precise power sequencing and brown-out protection. |
| Frequency and current foldback under fault conditions | Reduces switching frequency and peak current when FB/SENSE <1V or <1.7V - limits power dissipation during short-circuit events. |
| BIAS pin for efficiency optimization | When tied to VOUT ≥3.3V, shifts internal bias current sourcing from VIN to VOUT - improves efficiency by >10% at VIN=20V/VOUT=5V/IOUT=25mA. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Point-of-load (POL) conversion from 12V or 19V adapter to 5V for USB peripherals and I/O circuitry. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V at up to 4.25A with fast transient response to CPU I/O load steps. Use Value: High efficiency (>89% at 5V/4.25A) extends battery life; 500kHz switching allows use of small 1.8µH inductor and compact layout. |
Use Scenario: Power management in handheld test equipment with Li-ion battery input (8–16V) and 5V system rail. IC Role / Device Role / Timing Role: Main step-down converter enabling low-quiescent operation and controlled shutdown during sleep mode. Use Value: 30µA shutdown current minimizes battery drain; UVLO prevents erratic operation during battery sag. |
| Battery Chargers | Distributed Power |
Use Scenario: Constant-voltage stage in multi-cell Li-ion charger supplying 5V to charging controller and status LEDs. IC Role / Device Role / Timing Role: Regulated 5V source with robust short-circuit protection during connector insertion or fault events. Use Value: Foldback current limiting and frequency reduction prevent thermal runaway during output shorts - critical for safety-certified chargers. |
Use Scenario: Local 5V rail generation in telecom line cards powered from 12V or 24V backplane. IC Role / Device Role / Timing Role: Isolated POL regulator supporting hot-swap and board-level power sequencing. Use Value: Synchronization capability (via SYNC pin) eliminates beat frequencies in multi-rail systems; exposed-pad TSSOP aids thermal management in dense layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EUF#PBF | 40V input, 500kHz, external MOSFETs, no integrated switch; requires gate drivers and sense resistors. | Suitable for higher-current (>10A) or adjustable-output designs where thermal flexibility and efficiency tuning are prioritized. | Select LTC3866EUF#PBF when output current exceeds 4.5A or when adjustable output voltage and external FET selection are required. |
| MP2451DT-LF-Z | 36V input, 2A integrated switch, 340kHz fixed frequency, no BIAS or SYNC pins; lower cost, smaller footprint (SOT-23-6). | Targeted at space-constrained, lower-power applications (<2A) where full feature set is unnecessary. | Select MP2451DT-LF-Z when board area and BOM cost are critical and load current remains below 2A. |
Compared with LTC3866EUF#PBF, LT1374HVCR#TRPBF offers integrated switching and simpler layout but less scalability; versus MP2451DT-LF-Z, it delivers >2× output current and advanced protection features at the cost of larger package and higher unit price.
Availability
LT1374HVCR#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT1374HVCR#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 LT® series. Linear pioneered high-performance analog ICs with emphasis on precision, power efficiency, and ruggedness.
The LT1374HVCR#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for industrial, automotive, and portable applications demanding wide-input operation, integrated power switches, and robust fault protection without external complexity.
FAQ
What is the maximum input voltage rating for LT1374HVCR#TRPBF?
The LT1374HVCR#TRPBF has a maximum input voltage rating of 32V, distinguishing it from the standard LT1374 (25V). This higher rating supports operation from 24V industrial rails and 28V avionics supplies. Absolute maximum BOOST pin voltage is 38V, and the device includes internal overvoltage clamp circuitry to protect against transient spikes up to this level. Always maintain ≥1V margin between actual VIN and 32V for reliable long-term operation.
Does LT1374HVCR#TRPBF require an external feedback resistor network?
No, LT1374HVCR#TRPBF is the fixed 5V output variant and uses the SENSE pin (pin 6), not FB. It contains internal resistor dividers calibrated to 5.0V ±1.2%, so no external resistors are needed for output setting. This simplifies layout, improves accuracy, and eliminates resistor tolerance and temperature drift errors. External components remain necessary only for BOOST, input/output capacitors, inductor, and catch diode.
How does the BOOST pin function in LT1374HVCR#TRPBF?
The BOOST pin in LT1374HVCR#TRPBF supplies elevated drive voltage (~VIN + 5V) to the base of the internal NPN power switch, forcing deep saturation and reducing effective on-resistance to 0.07Ω. It requires an external flying capacitor (typically 10nF–100nF) and Schottky diode (e.g., MBRS330T3) connected between VIN and BOOST. Without proper BOOST implementation, switch conduction loss increases significantly, degrading efficiency and thermal performance.
What thermal management is required for LT1374HVCR#TRPBF in continuous 4A operation?
At 4A output with VIN = 12V and VOUT = 5V, LT1374HVCR#TRPBF dissipates ~1.8W. Its 16-pin TSSOP package requires the exposed thermal pad to be soldered to a ≥0.5 in² internal or external copper ground plane to achieve θJA ≈ 30°C/W. Without this, junction temperature may exceed 125°C under full load. Thermal vias (≥6× 0.3mm) beneath the pad and airflow >200LFM further improve reliability in enclosed environments.
Can LT1374HVCR#TRPBF synchronize to an external clock?
No - LT1374HVCR#TRPBF does not include a SYNC pin. The "CR" suffix denotes the standard 16-pin TSSOP package with SHDN functionality; synchronization is only available on variants marked "-SYNC" (e.g., LT1374HVCR#TRPBF-SYNC, which replaces SHDN with SYNC on pin 13). For synchronized operation, select the -SYNC variant or use the SHDN pin for enable/disable control only.
LT1374HVCR#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1374HVCR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVCR#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 LT1374HVCR#TRPBF reliable?
The price and inventory of LT1374HVCR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVCR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374HVCR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVCR#TRPBF transactions.
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4.How is shipping managed for LT1374HVCR#TRPBF?
LT1374HVCR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVCR#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 LT1374HVCR#TRPBF?
For technical support, including LT1374HVCR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVCR#TRPBF requirements.
6.How does Aetrix verify that LT1374HVCR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVCR#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 LT1374HVCR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374HVCR#TRPBF?
All LT1374HVCR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVCR#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 LT1374HVCR#TRPBF part is unused and in its original packaging.
Return procedure for LT1374HVCR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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