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Analog Devices Inc. LT1374IFE#TRPBF
- Part No.:
- LT1374IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1374IFE#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,308
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Product details
Overview
LT1374IFE#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with integrated 4.5A NPN power switch, current-mode control architecture, and 16-pin TSSOP exposed-pad package. It delivers up to 4.25A at 5V output from 6V–25V input, features cycle-by-cycle current limiting, 20µA shutdown current, and 0.07Ω switch on-resistance. It is used in portable computers and battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1374IFE#TRPBF datasheet, LT1374IFE#TRPBF pinout, LT1374IFE#TRPBF application, or LT1374IFE#TRPBF equivalent, key selection considerations include its fixed 5V output configuration (SENSE pin), BOOST capacitor requirement for switch saturation, thermal performance with exposed pad, synchronization capability up to 1MHz, and compatibility with standard surface-mount inductors as small as 1.8µH.
Technical Context
The LT1374IFE#TRPBF 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 the BOOST pin to achieve saturation-reducing conduction loss to ~0.07Ω-and enabling >89% efficiency at full load.
It integrates undervoltage lockout (2.38V on SHDN), dual-threshold shutdown (0.4V active shutdown, 2.38V UVLO), and frequency foldback below 1V FB/SENSE voltage. The SENSE pin (not FB) is used for fixed 5V operation, with 4.94–5.06V regulation tolerance and 7–14kΩ internal divider resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2%, regulated via internal SENSE feedback network |
| Switch Current Limit | 4.5A typical at ≤50% duty cycle; derates nonlinearly to 3.7A at 80% duty cycle due to slope compensation |
| Switching Frequency | 500kHz nominal (460–540kHz over temp); synchronizable from 580kHz to 1MHz via SYNC pin |
| Shutdown Current | 20µA max at VIN ≤25V, enabling ultra-low-power standby in battery systems |
| Input Voltage Range | 6V to 25V; minimum start-up voltage ~5.5V with 5V output |
| Efficiency | Up to 95% at 5V/2A (VIN=10V), sustained across wide load range via BIAS pin optimization |
| Package Thermal Resistance | θJA = 30°C/W with 0.5 in² copper area on backside ground plane; θJC = 4°C/W |
Pinout & Package
The LT1374IFE#TRPBF is housed in a 16-pin TSSOP package with exposed thermal pad (FE16), optimized for high-power density and thermal dissipation. Both VIN pins (pins 3 & 4) and both VSW pins (pins 10 & 11) must be shorted externally on 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 improve load regulation |
| VIN (pins 3, 4) | Input supply and switch collector | High dI/dt node; requires local 100µF solid tantalum + 0.27µF ceramic bypass; both pins must be shorted |
| BOOST (pin 5) | Switch driver boost supply | Connects to external capacitor+diode network; must exceed VIN by ≥2.3V to ensure switch saturation |
| SENSE (pin 6) | Fixed 5V output feedback | Replaces FB pin in -5 variants; connected directly to 5V output; 4.94–5.06V threshold enables tight regulation |
| SYNC (pin 12) | Oscillator synchronization input | Logic-compatible (1.5–2.2V threshold); accepts 580kHz–1MHz external clock; replaces SHDN in -SYNC variants |
| SHDN (pin 13) | Shutdown control | 2.38V UVLO / 0.4V full shutdown thresholds; 20µA quiescent draw when pulled low |
| VC (pin 14) | Error amplifier output & current limit setpoint | Used for loop compensation; also serves as current clamp point (0.9V switching threshold, 2.1V clamp) |
| BIAS (pin 15) | Internal bias supply input | Connect to regulated output (≥3.3V) to improve efficiency at high VIN/light loads; not present in DD/SO-8 packages |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent stability without external compensation components beyond standard RC network on VC pin |
| Saturating NPN switch with BOOST drive | Achieves 0.07Ω effective on-resistance, reducing conduction loss and enabling >89% efficiency vs. conventional bipolar designs (~75%) |
| Frequency foldback & current limit foldback | Reduces switching frequency and peak current when SENSE voltage drops below 1V or 1.7V respectively-limiting power dissipation during short-circuit faults |
| Exposed thermal pad (FE16 package) | Supports θJA = 30°C/W with proper PCB copper layout, enabling 4.25A continuous output without forced air cooling |
| BIAS pin efficiency enhancement | Redirects internal bias current from VIN to VOUT, improving efficiency by >10% at VIN=20V/VOUT=5V/IOUT=25mA |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core logic rail (5V) generation from single-cell Li-ion or multi-cell alkaline battery packs in ultraportable notebooks and tablets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V at up to 4.25A with dynamic load transient support and thermal robustness. Use Value: Enables compact design with 1.8µH inductor and solid tantalum output capacitor; 20µA shutdown current extends battery runtime in sleep mode. | Use Scenario: Power management in handheld test equipment, medical monitors, and ruggedized field instruments operating from 7.2V–24V battery inputs. IC Role / Device Role / Timing Role: Main system supply regulator with UVLO, short-circuit protection, and synchronization to avoid noise coupling into sensitive analog sections. Use Value: Foldback current limiting prevents thermal runaway during accidental shorts; SYNC pin allows alignment with master clock to suppress beat frequencies. |
| Battery Chargers | Distributed Power |
Use Scenario: Constant-voltage stage in multi-chemistry (Li-ion/NiMH) battery chargers where 5V rail powers charge controller ICs and status LEDs. IC Role / Device Role / Timing Role: Regulated 5V source with precise 4.94–5.06V tolerance and low output ripple (<50mVpp) for accurate ADC references and LED brightness control. Use Value: Internal 2.42V reference and low FB/SENSE bias current (<2µA) ensure minimal voltage error from divider loading; BIAS pin improves efficiency during float-charge phase. | Use Scenario: Local point-of-load (POL) conversion in telecom line cards or industrial PLCs where 24V backplane supplies distributed 5V rails. IC Role / Device Role / Timing Role: High-current POL regulator with synchronized switching to reduce conducted EMI across shared input bus. Use Value: 16-pin TSSOP with exposed pad supports high-density board layouts; SYNC capability enables deterministic noise spectrum for EMC compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EFE#PBF | External MOSFET controller (no integrated switch); supports up to 60V input; requires external gate drivers and sense resistors | Used where higher input voltage (>25V), adjustable output, or paralleling capability is required | Select LTC3850EFE#PBF only if input exceeds 25V or >4.5A output current with external FETs is needed; not drop-in compatible |
| TPS54560QPWPRQ1 | 4.5A integrated buck with 3.5–60V input; uses CMOS FETs; no BOOST pin; 500kHz fixed frequency; AEC-Q100 qualified | Targeted at automotive applications requiring extended temperature range and qualification | Choose TPS54560QPWPRQ1 for automotive-grade reliability; LT1374IFE#TRPBF remains preferred for industrial/portable use with BOOST-driven saturation efficiency |
Compared with LTC3850EFE#PBF and TPS54560QPWPRQ1, the LT1374IFE#TRPBF offers superior efficiency at medium input voltages (6–25V) due to its BOOST-saturated bipolar switch, while providing simpler BOM count than controllers and better thermal performance in TSSOP than many automotive-grade alternatives.
Availability
LT1374IFE#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1374IFE#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.
The LT1374IFE#TRPBF belongs to Linear's high-efficiency monolithic buck regulator family, designed specifically for space-constrained, thermally demanding applications where integration, reliability, and efficiency across wide load ranges are critical.
FAQ
What is the function of the SENSE pin on the LT1374IFE#TRPBF?
The SENSE pin on the LT1374IFE#TRPBF replaces the FB pin in fixed-output variants and connects directly to the 5V output rail. It references an internal 2.42V bandgap to maintain regulation within 4.94–5.06V tolerance. Unlike adjustable versions, it eliminates external resistor dividers and provides tighter accuracy with lower bias current sensitivity-critical for precision 5V system rails.
Does the LT1374IFE#TRPBF require an external BOOST capacitor, and why?
Yes, the LT1374IFE#TRPBF requires an external BOOST capacitor (typically 10nF–100nF) connected between BOOST and SW pins. This capacitor generates a voltage ~5V above VIN during switch turn-on, driving the internal NPN switch into deep saturation. Without it, switch on-resistance rises from 0.07Ω to ~0.13Ω, degrading efficiency by ~5–8% and increasing thermal stress under full load.
Can the LT1374IFE#TRPBF operate without the BIAS pin connected?
Yes, the LT1374IFE#TRPBF operates normally with BIAS pin open or unconnected. In this mode, internal circuitry draws bias current from VIN, resulting in standard efficiency curves. Connecting BIAS to the regulated 5V output (≥3.3V) improves efficiency by >10% at high input-to-output ratios (e.g., VIN=20V), as it reduces total input current draw by shifting bias supply from VIN to VOUT.
What is the maximum continuous output current for the LT1374IFE#TRPBF at 5V output?
The LT1374IFE#TRPBF delivers up to 4.25A continuously at 5V output when VIN=10V, L=5µH, and PCB thermal design meets θJA ≤30°C/W. At VIN=25V, maximum continuous current drops to ~3.3A due to increased conduction loss and reduced duty-cycle headroom. Derating curves in the datasheet confirm 4.25A is achievable only with proper copper pour and airflow.
How does the LT1374IFE#TRPBF handle short-circuit conditions?
The LT1374IFE#TRPBF employs dual-foldback protection: when SENSE voltage falls below 1.7V, peak switch current limit reduces progressively; below 1V, switching frequency folds back ~5:1 (to ~100kHz). This limits power dissipation in the IC, catch diode, and inductor during sustained shorts. Combined with thermal shutdown and cycle-by-cycle current limiting, it ensures robust fault survival without external circuitry.
LT1374IFE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1374IFE#TRPBF FAQ
1.How can I place an order for LT1374IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374IFE#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 LT1374IFE#TRPBF reliable?
The price and inventory of LT1374IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374IFE#TRPBF?
LT1374IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374IFE#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 LT1374IFE#TRPBF?
For technical support, including LT1374IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374IFE#TRPBF requirements.
6.How does Aetrix verify that LT1374IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374IFE#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 LT1374IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374IFE#TRPBF?
All LT1374IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374IFE#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 LT1374IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1374IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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