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Analog Devices Inc. LT1374CT7-5#PBF
- Part No.:
- LT1374CT7-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LT1374CT7-5#PBF.pdf
- Description:
- IC REG BCK SEPIC 5V 4.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,251
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Product details
Overview
LT1374CT7-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A monolithic buck switching regulator in a 7-pin TO-220 package with integrated 0.07Ω NPN power switch, 500kHz constant-frequency current-mode control, and cycle-by-cycle current limiting. It delivers up to 4.25A at 5V output from 6V–25V input and is used in battery-powered systems requiring high efficiency and compact DC/DC conversion.
For engineers reviewing the LT1374CT7-5#PBF datasheet, LT1374CT7-5#PBF pinout, LT1374CT7-5#PBF application, or LT1374CT7-5#PBF equivalent, key selection considerations include its fixed 5V SENSE pin interface, thermal shutdown and short-circuit protection, BOOST capacitor requirement for switch saturation, and compatibility with standard surface-mount inductors down to 1.8µH.
Technical Context
The LT1374CT7-5#PBF implements current-mode control using an internal error amplifier (2000 µMho transconductance), peak-current sensing via the SENSE pin, and slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its bipolar NPN switch is driven by a BOOST voltage ≥ VIN + 5V to achieve low on-resistance (0.07Ω at 4.5A).
It features dual shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for micropower shutdown (20µA quiescent current). The fixed 5V version replaces FB with SENSE, eliminating external resistor dividers and enabling direct connection to the regulated output for feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.2% (guaranteed over temperature and line) |
| Max Output Current | 4.25 A at VOUT = 5V, VIN = 10V, L = 5µH (continuous conduction mode) |
| Switch On Resistance | 0.07 Ω - enables high efficiency (>89%) by saturating internal NPN switch |
| Switching Frequency | 500 kHz ±8% - reduces size of external inductor and capacitor |
| Supply Current | 2.5 mA typical operating current; 20 µA shutdown current - extends battery life |
| Input Voltage Range | 6 V to 25 V - supports wide-range industrial and portable inputs |
| Current Limit | 4.5 A typical peak switch current limit - provides cycle-by-cycle short-circuit protection |
Pinout & Package
LT1374CT7-5#PBF uses a 7-pin TO-220 package (T7) with exposed tab electrically connected to GND. Thermal resistance θJA = 50°C/W, θJC = 4°C/W. Mounting requires heatsinking for >2A continuous loads.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB/SENSE) | Fixed-output feedback sense node | Connected directly to 5V output; senses 4.94–5.06V to regulate; enables foldback during overload |
| 2 (BOOST) | Switch driver boost supply | Must be ≥ VIN + 5V (min 2.3V above VIN); powers NPN base drive to achieve 0.07Ω RON |
| 3 (VIN) | Main power input | Supplies internal circuitry and switch collector; accepts 6–25V; bypass capacitor required at pin |
| 4 (GND) | Power and signal reference | Common return for load, catch diode, and internal bias; must be low-impedance path to minimize EMI and load regulation error |
| 5 (VSW) | Switch emitter node | Drives inductor; swings from ~0V to VIN; negative swing clamped by external catch diode (–0.8V max) |
| 6 (SHDN) | Shutdown control input | 0.4V = full shutdown (20µA IQ); 2.38V = UVLO lockout; logic-compatible active-low |
| 7 (VC) | Error amplifier output / current limit setpoint | Internal node controlling peak switch current; used for loop compensation; 0.9–2.1V operating range |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4.5A NPN power switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout area |
| Current-mode control architecture | Enables fast transient response and inherent cycle-by-cycle current limiting without external sensing |
| BOOST-driven saturation | Reduces switch conduction loss vs. conventional bipolar designs-efficiency improves from ~75% to >89% |
| Fixed 5V SENSE pin interface | Removes need for external resistor divider; simplifies design and improves accuracy vs. adjustable variants |
| Thermal shutdown & short-circuit protection | Full-cycle current limiting and junction temperature cutoff at 125°C prevent damage under fault conditions |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Point-of-load regulation for CPU core or peripheral rails in laptops and tablets. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering up to 4.25A with tight load regulation and fast transient response. Use Value: Enables compact, high-efficiency power delivery using only surface-mount components and ≤5µH inductors. |
Use Scenario: Main system supply in handheld test equipment, portable medical devices, and ruggedized field instruments. IC Role / Device Role / Timing Role: High-reliability 5V DC/DC converter supporting wide input (6–25V) from Li-ion packs or universal adapters. Use Value: 20µA shutdown current extends battery runtime; thermal shutdown ensures safe operation during intermittent high-load bursts. |
| Battery Chargers | Distributed Power |
Use Scenario: Constant-voltage stage in multi-cell Li-ion or lead-acid battery chargers. IC Role / Device Role / Timing Role: Regulated 5V source powering charger controller ICs, display drivers, and communication interfaces. Use Value: Foldback current limiting protects against shorted battery terminals; BOOST pin ensures stable regulation even at low input voltages. |
Use Scenario: Local 5V rail generation in telecom line cards, industrial PLC modules, and distributed sensor nodes. IC Role / Device Role / Timing Role: Isolated or non-isolated secondary-side buck regulator replacing discrete solutions. Use Value: TO-220 package allows direct heatsink mounting for sustained 3A+ loads; robust ESD and latch-up immunity suit harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE-5#PBF | 42V input, 3A, synchronous buck; no BOOST pin; 3mm × 4mm MSOP package | Higher input voltage rating and integrated MOSFETs; lower max current; no external catch diode needed | Choose for >25V input or space-constrained layouts; not drop-in due to different pinout and control scheme |
| LM2678T-5.0/NOPB | 40V input, 5A, external diode; 52kHz fixed frequency; SO-8 package; no current-mode control | Lower switching frequency increases inductor size; lacks cycle-by-cycle current limiting and BOOST-assisted saturation | Choose for cost-sensitive, non-critical efficiency applications where 500kHz noise is undesirable |
Compared with LT1374CT7-5#PBF, LTC3631EMSE-5#PBF offers higher input voltage and integration but lower current and no BOOST-based efficiency optimization; LM2678T-5.0/NOPB provides higher current at lower frequency but sacrifices transient response, protection granularity, and efficiency at light loads.
Availability
LT1374CT7-5#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-lifecycle support, and proven reliability in industrial temperature ranges.
Supply support for LT1374CT7-5#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 support for legacy Linear power products. Linear pioneered high-performance analog and power ICs with emphasis on precision, efficiency, and ruggedness.
The LT1374 product line was designed for high-current, high-efficiency buck conversion in space- and thermally-constrained applications, targeting portable, industrial, and telecom power systems where 500kHz operation and integrated bipolar switches deliver optimal size-to-performance ratio.
FAQ
What is the maximum continuous output current for LT1374CT7-5#PBF at 5V output?
The LT1374CT7-5#PBF delivers up to 4.25A continuously at 5V output when VIN = 10V and L = 5µH in continuous conduction mode. Peak switch current is rated at 4.5A up to 50% duty cycle, decreasing nonlinearly at higher duty cycles due to internal slope compensation. Derating is required above 85°C ambient or with inadequate heatsinking.
Does LT1374CT7-5#PBF require an external BOOST capacitor, and why?
Yes, LT1374CT7-5#PBF requires an external BOOST capacitor (typically 10nF–100nF ceramic) connected between BOOST and SW pins. This capacitor generates a voltage ≥ VIN + 5V to fully saturate the internal NPN power switch, reducing its on-resistance to 0.07Ω and enabling >89% efficiency. Omitting it results in excessive conduction loss and thermal runaway.
How does the SENSE pin function differ from the FB pin in LT1374CT7-5#PBF versus adjustable versions?
In LT1374CT7-5#PBF, the SENSE pin replaces FB and connects directly to the 5V output to close the regulation loop. It senses 4.94–5.06V and triggers foldback current limiting and frequency reduction if output voltage collapses below 1V. Adjustable versions use FB with external resistors; LT1374CT7-5#PBF eliminates that divider, improving accuracy and reducing component count.
Can LT1374CT7-5#PBF operate without the BIAS pin connected?
Yes, LT1374CT7-5#PBF operates without BIAS pin connection because the BIAS pin is not present in the T7 (TO-220) package-it is only available in SO-8 and TSSOP variants. Internal bias is drawn from VIN, and efficiency remains high across the 6–25V input range. No external BIAS connection is possible or required for this part number.
What protection features are built into LT1374CT7-5#PBF?
LT1374CT7-5#PBF integrates cycle-by-cycle current limiting, thermal shutdown at 125°C junction temperature, undervoltage lockout (2.38V SHDN threshold), and micropower shutdown (0.4V SHDN threshold). It also features foldback current limiting and frequency reduction during output short-circuit events to limit power dissipation in the IC and external components.
LT1374CT7-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 4.5A (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
LT1374CT7-5#PBF FAQ
1.How can I place an order for LT1374CT7-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CT7-5#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 LT1374CT7-5#PBF reliable?
The price and inventory of LT1374CT7-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CT7-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1374CT7-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CT7-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CT7-5#PBF?
LT1374CT7-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CT7-5#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 LT1374CT7-5#PBF?
For technical support, including LT1374CT7-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CT7-5#PBF requirements.
6.How does Aetrix verify that LT1374CT7-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374CT7-5#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 LT1374CT7-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1374CT7-5#PBF?
All LT1374CT7-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CT7-5#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 LT1374CT7-5#PBF part is unused and in its original packaging.
Return procedure for LT1374CT7-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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