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Analog Devices Inc. LT1374IFE#PBF
- Part No.:
- LT1374IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1374IFE#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:830
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Product details
Overview
LT1374IFE#PBF 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 6–25V input, features cycle-by-cycle current limiting, 0.07Ω switch on-resistance, 2.5mA operating supply current, and 20µA shutdown current. It is used in portable computers and battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1374IFE#PBF datasheet, LT1374IFE#PBF pinout, LT1374IFE#PBF application, or LT1374IFE#PBF equivalent, key selection considerations include its fixed 5V output version (-5 suffix), TSSOP-16 thermal performance (θJA = 40°C/W with exposed pad soldered), BOOST pin voltage requirements (≥2.3V above VIN), SENSE pin accuracy (4.94–5.06V), and synchronization capability (580kHz–1MHz range).
Technical Context
The LT1374IFE#PBF 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 a BOOST capacitor to achieve saturation, reducing conduction loss to that of a 0.07Ω FET structure.
It integrates undervoltage lockout (2.38V on SHDN), dual-threshold shutdown (0.4V full shutdown), slope compensation for subharmonic stability, and frequency foldback below 1V SENSE voltage. The BIAS pin enables efficiency optimization by sourcing bias current from the regulated output when VOUT ≥ 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz nominal; enables use of small 1.8–10 µH inductors and reduces EMI filtering burden. |
| Output Voltage | Fixed 5V (±1.2% over temp); SENSE pin replaces FB for direct 5V feedback without external divider. |
| Max Output Current | 4.25A at VOUT = 5V, VIN = 10V, L = 5µH; derates with duty cycle due to slope-compensated current limit. |
| Switch On-Resistance | 0.07Ω at ISW = 4.5A; achieved via BOOST-driven saturation, enabling >89% efficiency at mid-load. |
| Supply Current | 2.5mA typical operating current; drops to 20µA in shutdown-critical for battery runtime extension. |
| SENSE Pin Voltage | 5.0V ±1.2% (4.94–5.06V); defines regulation setpoint with low drift over temperature (±0.005V/°C). |
| Thermal Resistance | θJA = 40°C/W with exposed pad soldered to ground plane; requires PCB copper area for safe 4.5A operation. |
Pinout & Package
LT1374IFE#PBF is housed in a 16-pin TSSOP package with exposed thermal pad (FE16). The package supports high-power dissipation via soldered pad connection to internal/external ground planes.
| 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 tied together and connected directly to thermal pad for thermal and EMI control. |
| VIN (Pins 3, 4) | Input supply and switch collector | Dual VIN pins reduce trace inductance; must be shorted externally and bypassed near package to suppress dI/dt spikes. |
| VSW (Pins 10, 11) | Switch emitter node | Dual VSW pins carry full inductor current; require low-inductance path to catch diode and output capacitor. |
| BOOST (Pin 5) | Switch driver boost supply | Requires external capacitor + diode to generate ~VIN+5V; minimum 2.3V above VIN needed for full switch saturation. |
| FB/SENSE (Pin 6) | 5V output sensing input | Fixed 5V version uses this as SENSE pin-connect directly to regulated 5V output; enables foldback protection below 1V. |
| SYNC (Pin 12) | External oscillator synchronization input | Logic-compatible input (1.5–2.2V threshold); accepts 580kHz–1MHz external clock to eliminate beat frequencies. |
| SHDN (Pin 13) | Shutdown control | 2.38V UVLO and 0.4V deep shutdown thresholds; drives supply current from 2.5mA to 20µA when pulled low. |
| VC (Pin 14) | Error amplifier output / current limit control | Provides access to loop compensation network; also serves as current clamp point (0.9V switch threshold, 2.1V clamp). |
| BIAS (Pin 15) | Internal bias supply input | Connect to VOUT ≥3.3V to source bias current externally-improves efficiency by >10% at high VIN/light load. |
| NC (Pin 2) | No connect | Internally unconnected; may be left floating or tied to GND for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent loop stability without external compensation components beyond VC network. |
| Integrated BOOST drive | Eliminates need for external gate driver; achieves 0.07Ω effective switch resistance and >89% peak efficiency. |
| Frequency foldback | Reduces switching frequency 5:1 when SENSE < 1V-limits power dissipation during short-circuit without thermal shutdown. |
| Dual-threshold shutdown | 2.38V UVLO prevents startup until input is valid; 0.4V deep shutdown cuts supply current to 20µA for battery preservation. |
| Slope-compensated current limit | Maintains stability across 50–90% duty cycle range; allows continuous-mode operation with inductors as small as 1.8µH. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core logic rail (5V) generation from single-cell Li-ion or multi-cell alkaline input in ultraportable notebooks and tablets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V/4.25A with tight load regulation and low quiescent current. Use Value: Enables compact layout with 5µH inductor and solid tantalum output capacitor; 20µA shutdown extends standby time to weeks. |
Use Scenario: Power management in handheld test equipment, medical monitors, and ruggedized field instruments. IC Role / Device Role / Timing Role: Main DC/DC converter supplying microcontroller, display, and sensor subsystems from variable battery input (6–25V). Use Value: Current-mode control ensures stable operation under rapid load transients (e.g., LCD backlight burst); BOOST pin simplifies high-efficiency design. |
| Battery Chargers | Distributed Power |
Use Scenario: Intermediate 5V bus generation in multi-chemistry battery chargers supporting NiMH, Li-ion, and lead-acid chemistries. IC Role / Device Role / Timing Role: Regulated 5V supply for charge controller ICs, communication interfaces (I²C, UART), and status LEDs. Use Value: Synchronization capability eliminates noise coupling into sensitive analog charging circuits; foldback protects during cell mismatch faults. |
Use Scenario: Local 5V regulation in industrial PLC I/O modules, remote sensors, and distributed control nodes powered via 24V backplane. IC Role / Device Role / Timing Role: Point-of-load converter providing clean, isolated 5V rail with high PSRR and low EMI emissions. Use Value: Exposed-pad TSSOP package enables reliable thermal performance in confined enclosures; BIAS pin improves efficiency at 24V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#PBF | 42V input, 3.5A, 3MHz sync-capable buck; uses MOSFET switch, no BOOST pin required. | Higher input voltage range and switching frequency; better suited for space-constrained designs needing smaller LC filters. | Select LTC3632EMSE#PBF when input exceeds 25V or board area demands <1MHz operation; not pin-compatible. |
| TPS54331DR | 28V input, 3A, 570kHz adjustable-output buck; integrated MOSFET, no BIAS/BOOST pins. | Lacks BOOST and BIAS functionality; lower max current and no foldback protection; simpler external component count. | Choose TPS54331DR for cost-sensitive, non-critical 3A applications where 5V fixed output and fault robustness are secondary. |
Compared with LT1374IFE#PBF, LTC3632EMSE#PBF offers higher input voltage and frequency but lacks the BOOST-driven saturation efficiency advantage at high current, while TPS54331DR trades away protection features and thermal headroom for integration simplicity and lower BOM cost.
Availability
LT1374IFE#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 guaranteed traceable sourcing.
Supply support for LT1374IFE#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 line, known for high-performance analog and power management ICs.
The LT1374IFE#PBF belongs to Linear's monolithic buck regulator family designed for high-current, high-efficiency DC/DC conversion in space- and thermal-constrained environments where reliability under transient and fault conditions is critical.
FAQ
What is the function of the BOOST pin on the LT1374IFE#PBF?
The BOOST pin on the LT1374IFE#PBF supplies a boosted voltage (typically VIN + 5V) to the base of the internal NPN power switch, enabling full saturation and achieving an effective on-resistance of 0.07Ω. This is implemented with an external capacitor and diode; the BOOST voltage must exceed VIN by at least 2.3V to guarantee saturation across temperature and load. Without proper BOOST operation, efficiency drops significantly due to increased VCE(sat).
Can the LT1374IFE#PBF be synchronized to an external clock?
Yes, the LT1374IFE#PBF supports external synchronization via its SYNC pin (Pin 12), which accepts logic-level signals from 580kHz to 1MHz with 10–90% duty cycle. The internal oscillator locks to the external frequency, eliminating beat frequencies in multi-rail systems. Synchronization is disabled during foldback operation (SENSE < 1V) to preserve fault protection integrity.
How does the LT1374IFE#PBF handle short-circuit conditions?
The LT1374IFE#PBF employs dual-foldback protection: when SENSE voltage falls below 1.7V, peak switch current limit is reduced; 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 cycle-by-cycle current limiting and thermal shutdown, it survives indefinite 0V output without damage under proper PCB layout.
What is the role of the BIAS pin on the LT1374IFE#PBF?
The BIAS pin on the LT1374IFE#PBF allows the internal bias circuitry to draw operating current from the regulated output (≥3.3V) instead of VIN, improving efficiency-especially at high input voltages and light loads. At VIN = 20V, VOUT = 5V, and IOUT = 25mA, connecting BIAS to VOUT yields >10% efficiency gain. If left open, BIAS current is sourced from VIN, increasing total input current.
Is the LT1374IFE#PBF pin-compatible with other LT1374 variants?
No-the LT1374IFE#PBF (TSSOP-16) has a unique 16-pin pinout distinct from the SO-8 (8-pin), DD (7-pin), or TO-220 (7-pin) versions. While functional behavior is consistent across packages, PCB layout, thermal pad connection, and pin assignments differ. Migration requires redesign; the FE16 package specifically allocates dual VIN/VSW/GND pins and includes BIAS/SYNC not present in smaller packages.
LT1374IFE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1374IFE#PBF FAQ
1.How can I place an order for LT1374IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374IFE#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 LT1374IFE#PBF reliable?
The price and inventory of LT1374IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1374IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374IFE#PBF?
LT1374IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374IFE#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 LT1374IFE#PBF?
For technical support, including LT1374IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374IFE#PBF requirements.
6.How does Aetrix verify that LT1374IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374IFE#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 LT1374IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1374IFE#PBF?
All LT1374IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374IFE#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 LT1374IFE#PBF part is unused and in its original packaging.
Return procedure for LT1374IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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