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Analog Devices Inc. LT1374CFE#PBF
- Part No.:
- LT1374CFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1374CFE#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,293
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Product details
Overview
LT1374CFE#PBF 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 delivers up to 4.25A at 5V from 6V–25V input, features 0.07Ω switch on-resistance, 2.5mA quiescent supply current, and cycle-by-cycle current limiting. Used in portable computers and battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1374CFE#PBF datasheet, LT1374CFE#PBF pinout, LT1374CFE#PBF application, or LT1374CFE#PBF equivalent, key selection considerations include its 16-pin TSSOP-EP package with dual VIN/VSW pins, BOOST-driven saturation for >89% efficiency, shutdown current of 20µA, and compatibility with standard surface-mount inductors as small as 1.8µH.
Technical Context
The LT1374CFE#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 the BOOST pin to achieve saturation-reducing voltage drop to ~0.07Ω at 4.5A and enabling high efficiency across wide load ranges.
It integrates undervoltage lockout (2.38V on SHDN), thermal shutdown, and foldback protection: FB/SENSE voltage below 1.7V reduces current limit; below 1V, switching frequency drops to ~100kHz. The BIAS pin (available in FE16 package) allows external biasing from the regulated output to improve efficiency at high VIN/light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (SENSE pin tied directly to VOUT) |
| Switch Current Limit | 4.5A typical at ≤50% duty cycle; derates nonlinearly above 50% due to slope compensation |
| Switching Frequency | 500kHz nominal (460–540kHz over temp); synchronizable to 580–1000kHz via SYNC pin |
| Input Voltage Range | 6V to 25V (minimum start-up VIN = 5.5V; minimum running VIN depends on VOUT and load) |
| Efficiency | ≥90% at 5V/2A, VIN=10V; >89% enabled by BOOST-saturated switch and BIAS-assisted biasing |
| Quiescent Supply Current | 2.5mA typical (VIN supply only); drops to 20µA in shutdown mode |
| Package Thermal Resistance | θJA = 30°C/W with 0.5 in² copper pad; θJC = 4°C/W (exposed pad soldered to GND plane) |
Pinout & Package
LT1374CFE#PBF is housed in a 16-pin thermally enhanced TSSOP (FE16) package with exposed pad. Dual VIN and VSW pins are internally connected and must be shorted externally on PCB for optimal current handling and thermal performance. GND pins (pins 1, 8, 9, 16) provide low-inductance return paths critical for EMI control and load regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,8,9,16) | Power and signal reference ground | Must connect all four pins to solid ground plane; separates load return from noisy switch node to preserve regulation and minimize EMI radiation |
| VIN (3,4) | Input supply and switch collector | Dual pins reduce trace inductance; requires local 100µF tantalum + 0.27µF ceramic bypass near pin 3/4 |
| BOOST (5) | Switch driver boost supply | Connects to VIN + 5V via external diode/capacitor; enables NPN saturation and <0.07Ω effective RCE(sat) |
| FB/SENSE (6) | Fixed-output voltage sense input | Internally connected to 5V output; monitors VOUT for regulation; triggers foldback if voltage collapses below 1.7V |
| VSW (10,11) | Switch emitter output | Dual pins carry full inductor current; must tie together and route directly to catch diode cathode and inductor |
| SYNC (12) | External oscillator synchronization input | Logic-level compatible (1.5–2.2V threshold); accepts 580–1000kHz square wave; replaces SHDN function in -SYNC variants |
| SHDN (13) | Shutdown control with UVLO | 2.38V threshold disables switching (UVLO); 0.4V threshold forces micropower shutdown (20µA IQ) |
| VC (14) | Error amplifier output / current limit setpoint | Used for loop compensation; clamps at 0.9V (off) and 2.1V (full on); can override regulation or force shutdown |
| BIAS (15) | Internal circuitry bias supply | Accepts 3–7V external bias (e.g., from VOUT); reduces VIN supply current and improves efficiency at high VIN/light loads |
Key Features
| Feature | Design Value |
|---|---|
| BOOST-driven saturated NPN switch | Enables 0.07Ω effective on-resistance and >89% efficiency-unlike conventional bipolar regulators limited to ~75% |
| Current-mode control with slope compensation | Provides inherent cycle-by-cycle current limiting and stable loop response without external compensation components |
| Integrated foldback protection | Automatically reduces switching frequency and peak current when SENSE voltage falls below 1.7V or 1.0V-limiting power dissipation during short-circuit faults |
| Thermally enhanced FE16 package | Exposed pad and multiple GND/VIN/VSW pins achieve θJA = 30°C/W with proper PCB layout-enabling 4.25A continuous output without heatsink |
| BIAS pin for efficiency optimization | Allows internal bias circuitry to draw power from regulated output instead of VIN, improving efficiency by >10% at VIN=20V/VOUT=5V/IOUT=25mA |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Point-of-load DC/DC conversion for CPU core logic or peripheral rails in laptops and tablets. IC Role / Device Role / Timing Role: Fixed 5V buck regulator delivering up to 4.25A with fast transient response to handle CPU burst loads. Use Value: High efficiency (>90% at mid-load) extends battery life; compact 16-pin TSSOP-EP footprint saves board space versus discrete solutions. |
Use Scenario: Power management in handheld test equipment, portable medical devices, and ruggedized field instruments. IC Role / Device Role / Timing Role: Primary 5V supply from Li-ion or multi-cell alkaline batteries, supporting wide-input operation (6–25V). Use Value: 20µA shutdown current preserves battery charge during standby; foldback protection prevents thermal runaway during accidental shorts. |
| Battery Chargers | Distributed Power |
Use Scenario: Constant-voltage stage in multi-chemistry battery chargers (e.g., 5V USB-PD sink or LiFePO4 charging rail). IC Role / Device Role / Timing Role: Regulated 5V source feeding charger IC control circuitry and communication interfaces (I²C, USB). Use Value: Tight 5.0V ±1.2% output tolerance ensures accurate charger reference; SYNC capability allows noise-sensitive systems to align switching with other clocks. |
Use Scenario: Local regulation in telecom line cards, industrial PLC modules, or distributed sensor nodes with centralized 24V/48V backplane. IC Role / Device Role / Timing Role: Compact, robust 5V POL converter tolerant of input ripple and transient surges on shared power rails. Use Value: Dual VIN/VSW pins and exposed thermal pad ensure reliability under sustained 4.25A load; BIAS pin improves efficiency when powered from high-voltage bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#PBF | 4A synchronous buck, 3MHz switching, integrated MOSFETs; no BOOST pin required; 2.5µA quiescent current | Higher frequency enables smaller inductors (1–2.2µH); lacks foldback frequency reduction; not pin-compatible | Select for ultra-compact designs where size outweighs fault-protection depth; verify thermal performance at 4A continuous. |
| TPS54332DR | 3A synchronous buck, 1MHz, integrated FETs; 4.5–28V input; 1.5µA shutdown current; no BIAS pin or foldback | Lower max current (3A vs 4.25A); higher switching frequency reduces inductor size but increases switching loss at high load | Choose for cost-sensitive industrial applications where 3A suffices and external sync is unnecessary; validate thermal margin at full load. |
Compared with LTC3605EDE#PBF and TPS54332DR, the LT1374CFE#PBF offers higher output current (4.25A), unique BOOST-saturation efficiency, and comprehensive foldback protection-but requires external diode and larger inductor. It remains optimal for rugged, medium-frequency 5V POL where fault resilience and thermal headroom are prioritized over minimal footprint.
Availability
LT1374CFE#PBF 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 guaranteed traceable sourcing.
Supply support for LT1374CFE#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 and power management ICs with emphasis on precision, speed, and ruggedness.
The LT1374CFE#PBF belongs to Linear's monolithic buck regulator product line, designed specifically for high-current, medium-frequency DC/DC conversion in space-constrained, thermally demanding environments such as portable computing and industrial edge devices.
FAQ
What is the maximum continuous output current of the LT1374CFE#PBF?
The LT1374CFE#PBF delivers up to 4.25A continuous at 5V output when VIN = 10V and ambient temperature is ≤40°C with proper PCB thermal design (0.5 in² copper pad). At higher input voltages (e.g., VIN = 25V), maximum load current decreases due to increased inductor ripple and switch conduction loss-verify against the "Maximum Load Current" curves in the LT1374 datasheet for your specific VOUT, VIN, and L values.
Does the LT1374CFE#PBF require an external catch diode?
Yes, the LT1374CFE#PBF requires an external Schottky catch diode (e.g., MBRS330T3) connected between VSW and GND. Unlike synchronous buck regulators, it uses an internal NPN switch and relies on this external diode to provide the freewheeling path during switch-off time. The diode's forward voltage and reverse recovery characteristics directly impact efficiency and thermal performance.
How does the BOOST pin function in the LT1374CFE#PBF?
The BOOST pin on the LT1374CFE#PBF supplies a voltage ~5V above VIN to the internal NPN switch driver, enabling deep saturation and reducing effective on-resistance to 0.07Ω. It is charged via an external capacitor (typically 10nF–100nF) and diode (e.g., CMDSH3) from VIN. Without BOOST, the switch operates in linear mode with much higher VCE(sat), degrading efficiency significantly.
Can the LT1374CFE#PBF be synchronized to an external clock?
Yes, the LT1374CFE#PBF supports external synchronization via the SYNC pin (pin 12). It accepts logic-level square waves from 580kHz to 1MHz with 10–90% duty cycle. When synchronized, the internal oscillator locks to the external signal-reducing beat frequencies and EMI in noise-sensitive systems. Note: SYNC replaces SHDN functionality in -SYNC variants, but LT1374CFE#PBF retains dedicated SHDN (pin 13).
What is the purpose of the BIAS pin on the LT1374CFE#PBF?
The BIAS pin (pin 15) on the LT1374CFE#PBF allows the internal bias circuitry to draw operating current from the regulated 5V output instead of VIN. When connected to VOUT (≥3.3V), it reduces total input supply current and improves efficiency-by over 10% at VIN = 20V, VOUT = 5V, and IOUT = 25mA. This feature is especially valuable in high-input-voltage, light-load scenarios common in distributed power architectures.
LT1374CFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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):
- 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#PBF FAQ
1.How can I place an order for LT1374CFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CFE#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 LT1374CFE#PBF reliable?
The price and inventory of LT1374CFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1374CFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CFE#PBF?
LT1374CFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CFE#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 LT1374CFE#PBF?
For technical support, including LT1374CFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CFE#PBF requirements.
6.How does Aetrix verify that LT1374CFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374CFE#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 LT1374CFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1374CFE#PBF?
All LT1374CFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CFE#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 LT1374CFE#PBF part is unused and in its original packaging.
Return procedure for LT1374CFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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