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Analog Devices Inc. LT1374CFE#TRPBF
- Part No.:
- LT1374CFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1374CFE#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,021
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Product details
Overview
LT1374CFE#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with integrated 4.5A NPN power switch, current-mode control, and fixed 5V output. It operates from 6V to 25V input, delivers up to 4.25A at 5V, and features cycle-by-cycle current limiting, thermal shutdown, and 20µA shutdown current. Used in portable computers and battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1374CFE#TRPBF datasheet, LT1374CFE#TRPBF pinout, LT1374CFE#TRPBF application, or LT1374CFE#TRPBF equivalent, key selection criteria include its fixed 5V output configuration, 16-pin TSSOP-EP package with dual VIN/VSW pins, BOOST-driven saturation for 0.07Ω effective switch resistance, and synchronization capability up to 1MHz - all critical for space-constrained, thermally sensitive, or noise-sensitive buck designs.
Technical Context
The LT1374CFE#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the SENSE pin. Its bipolar NPN switch is driven via the BOOST pin to achieve saturation, reducing conduction loss and enabling >89% efficiency at full load.
It integrates undervoltage lockout (2.38V on SHDN), dual-threshold shutdown (0.4V active shutdown), and frequency foldback below 1V SENSE voltage. The FE16 package provides exposed-pad thermal dissipation (θJA = 40°C/W with proper grounding), supporting continuous operation up to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.2% (SENSE pin tied directly to VOUT; no external divider required) |
| Switch Current Limit | 4.5 A typical at ≤50% duty cycle; derates nonlinearly to ~3.7 A at 80% duty cycle due to slope compensation |
| Switching Frequency | 500 kHz nominal (460–540 kHz over temp); synchronizable from 580 kHz to 1 MHz via SYNC pin |
| Input Voltage Range | 6 V to 25 V (minimum start-up voltage ~5.5 V; UVLO threshold 2.38 V on SHDN) |
| Shutdown Current | 20 µA typical (measured at VSHDN = 0 V, VIN ≤ 25 V, VSW = 0 V) |
| Efficiency | Up to 95% at 5V/2A (VIN = 10V, L = 10 µH); maintained across wide load range via BIAS pin biasing and BOOST-saturation |
| Thermal Protection | Internal thermal shutdown active above TJ = 125°C; automatic recovery after cooldown |
Pinout & Package
LT1374CFE#TRPBF is housed in a 16-pin plastic TSSOP with exposed pad (FE16 package). The exposed pad must be soldered to a PCB ground plane for thermal and electrical performance (θJA = 40°C/W typical). Dual VIN and VSW pins are internally paralleled and must be shorted externally on the PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Multiple GND pins reduce impedance; must connect to low-inductance ground plane to minimize EMI and ensure load regulation |
| VIN (Pins 3, 4) | Input supply and switch collector | Dual pins reduce trace inductance; bypass capacitor must be placed adjacent to both pins to suppress dI/dt spikes |
| BOOST (Pin 5) | Switch driver boost voltage node | Requires external capacitor + diode to generate ~VIN+5V drive; enables NPN saturation and 0.07Ω effective RDS(on) |
| FB/SENSE (Pin 6) | Fixed-output voltage sense input | Internally connected to 5V output; monitors regulation and triggers foldback protection if voltage drops below 1V |
| VSW (Pins 10, 11) | Switch emitter output | Dual pins handle high AC current; must be shorted externally and routed near catch diode to minimize loop area |
| SYNC (Pin 12) | External oscillator synchronization input | Logic-compatible (1.5–2.2 V threshold); accepts 580 kHz–1 MHz square wave to eliminate beat frequencies in multi-rail systems |
| SHDN (Pin 13) | Shutdown control input | 2.38 V UVLO disable / 0.4 V deep shutdown; pulls supply current to 20 µA when grounded |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Used for loop compensation; also serves as override point (e.g., clamp to ground to force shutdown) |
| BIAS (Pin 15) | Internal bias supply input | Connect to regulated 5V output to improve efficiency at high VIN/light loads (e.g., +10% at VIN=20V, IOUT=25mA) |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent stability without complex compensation; eliminates LC resonance phase reversal |
| BOOST-driven NPN saturation | Reduces switch voltage drop to ~0.3 V at 4.5 A, improving efficiency by >14% vs. conventional bipolar designs |
| Frequency and current foldback | Automatically reduces switching frequency (5:1) and peak current limit (<3 A) during short-circuit to limit IC/diode/inductor power dissipation |
| Synchronization capability | Allows precise timing alignment with system clock or other converters to avoid interference and simplify EMI filtering |
| Exposed-pad TSSOP thermal design | Supports 4.25 A continuous output with θJA = 40°C/W when mounted per JEDEC MO-153 guidelines |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core logic and I/O rail generation in ultraportable laptops with tight thermal budgets and limited board area. IC Role / Device Role / Timing Role: Primary 5V intermediate bus converter stepping down from 12V or 19V battery-derived input. Use Value: High 500kHz switching enables <10 µH inductor size and <100 µF output capacitance, reducing solution footprint by >35% vs. 100kHz alternatives. |
Use Scenario: Power management in handheld test equipment powered by Li-ion packs (8–25V range). IC Role / Device Role / Timing Role: Fixed 5V supply for microcontroller, ADC, and display interface circuitry. Use Value: 20 µA shutdown current extends battery life during sleep mode; BIAS pin connection improves light-load efficiency by >10%. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V rail in multi-chemistry smart chargers supporting USB-C PD negotiation and status LEDs. IC Role / Device Role / Timing Role: Regulated 5V source for charger controller, communication ICs, and sensing circuitry. Use Value: Cycle-by-cycle current limiting and thermal shutdown protect against fault conditions during abnormal cell behavior or connector shorts. |
Use Scenario: Local 5V supply in industrial IoT gateways with multiple isolated sensor interfaces and wireless modules. IC Role / Device Role / Timing Role: Point-of-load regulator fed from a 12V or 24V backplane. Use Value: SYNC pin allows synchronization to master clock, eliminating heterodyne noise in sensitive analog front-ends and RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EMSE#PBF | 40V input, 5A synchronous buck controller (external MOSFETs); requires external gate drivers and feedback resistors | Higher input voltage range and synchronous rectification enable >92% efficiency at 12V→5V/4A; not pin-compatible | Select for higher efficiency, wider VIN, or programmable features; requires redesign of power stage and compensation network |
| MP2307DN-LF-Z | 36V input, 3A integrated synchronous buck; fixed 5V option available; 500kHz switching; smaller SO-8 package | Lower max current (3A vs. 4.25A), no SYNC or BIAS pins, no frequency foldback; lower cost and footprint | Select for cost-sensitive, lower-current applications where thermal headroom and advanced protection are secondary |
Compared with LTC3866EMSE#PBF and MP2307DN-LF-Z, the LT1374CFE#TRPBF uniquely combines fixed 5V output, integrated bipolar switch with BOOST saturation, robust foldback protection, and synchronization - making it optimal for thermally constrained, noise-sensitive 4A-class portable and industrial buck applications where simplicity and reliability outweigh raw efficiency gains.
Availability
LT1374CFE#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 traceable sourcing.
Supply support for LT1374CFE#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® family of high-performance analog ICs.
The LT1374CFE#TRPBF belongs to Linear's monolithic current-mode buck regulator product line, designed specifically for compact, high-efficiency DC/DC conversion in portable, battery-operated, and thermally demanding applications where integration, protection, and ease of layout are critical.
FAQ
What is the function of the SENSE pin on the LT1374CFE#TRPBF?
The SENSE pin on the LT1374CFE#TRPBF replaces the FB pin in fixed-output variants and connects directly to the 5V output to close the regulation loop. It provides precise 5.0V ±1.2% output accuracy and enables foldback protection: when SENSE voltage drops below 1V, the LT1374CFE#TRPBF reduces switching frequency and current limit to manage power dissipation during short-circuit events.
Can the LT1374CFE#TRPBF be synchronized to an external clock?
Yes, the LT1374CFE#TRPBF supports external synchronization via its SYNC pin (Pin 12), which accepts logic-level signals from 580kHz to 1MHz with 10–90% duty cycle. This feature allows precise timing alignment with system clocks or other converters to suppress beat frequencies and simplify EMI filter design - a capability not present in standard 5V buck regulators like the MP2307DN-LF-Z.
What thermal considerations apply to the LT1374CFE#TRPBF in the FE16 package?
The LT1374CFE#TRPBF in the 16-pin TSSOP-EP (FE16) package requires the exposed pad to be soldered to a minimum 0.5-inch² copper area connected to GND for thermal performance. With proper mounting, θJA is 40°C/W, enabling 4.25A continuous output at TA = 70°C. Failure to ground the pad raises junction temperature significantly and may trigger thermal shutdown under sustained load.
How does the BOOST pin improve efficiency in the LT1374CFE#TRPBF?
The BOOST pin on the LT1374CFE#TRPBF supplies a voltage ~5V above VIN to the internal NPN switch driver, forcing deep saturation and reducing effective on-resistance to 0.07Ω. This cuts conduction loss dramatically versus standard bipolar designs (which exhibit ~1.5V VCE(sat)), raising efficiency from ~75% to >89% at full load - a direct result of the BOOST architecture, not achievable with standard buck ICs lacking this feature.
Does the LT1374CFE#TRPBF support adjustable output voltage?
No, the LT1374CFE#TRPBF is a fixed 5V output variant. It uses the SENSE pin (internally connected to the 5V output) instead of the FB pin used in adjustable versions like the LT1374CS8. To implement adjustable output, select the LT1374CS8 or LT1374CR-5 and use an external resistor divider - the LT1374CFE#TRPBF lacks the internal reference and feedback path required for adjustment.
LT1374CFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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):
- 25V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 21.5V
- 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:
- 16-TSSOP-EP
LT1374CFE#TRPBF FAQ
1.How can I place an order for LT1374CFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CFE#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 LT1374CFE#TRPBF reliable?
The price and inventory of LT1374CFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374CFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CFE#TRPBF?
LT1374CFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CFE#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 LT1374CFE#TRPBF?
For technical support, including LT1374CFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CFE#TRPBF requirements.
6.How does Aetrix verify that LT1374CFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374CFE#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 LT1374CFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374CFE#TRPBF?
All LT1374CFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CFE#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 LT1374CFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1374CFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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