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Analog Devices Inc. LT1374HVIS8#TRPBF
- Part No.:
- LT1374HVIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374HVIS8#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,129
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Product details
Overview
LT1374HVIS8#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 32V input, delivers up to 4.25A at 5V, and features cycle-by-cycle current limiting, thermal shutdown, and 20µA shutdown current. Used in battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1374HVIS8#TRPBF datasheet, LT1374HVIS8#TRPBF pinout, LT1374HVIS8#TRPBF application, or LT1374HVIS8#TRPBF equivalent, key selection criteria include its HV-rated 32V input capability, fixed 5V SENSE-pin configuration, exposed-pad SO-8 package thermal performance (θJA = 30°C/W), and compatibility with standard surface-mount magnetics and catch diodes.
Technical Context
The LT1374HVIS8#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops: one for output voltage regulation via the SENSE pin (5.0V ±1.2%), and another for cycle-by-cycle peak switch current sensing. Its bipolar NPN switch uses BOOST pin drive to achieve 0.07Ω on-resistance and >89% efficiency at full load.
It integrates undervoltage lockout (2.38V on SHDN), micropower shutdown (20µA), and optional synchronization (580kHz–1MHz range). The BIAS pin enables efficiency optimization by sourcing internal bias current from the regulated 5V output when VIN ≥ 10V, reducing input supply current by >10% at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - Supports wide-input industrial and automotive battery systems without external pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.2% - Internally trimmed SENSE pin eliminates external resistor divider, simplifying layout and improving accuracy. |
| Max Output Current | 4.25A at VOUT=5V, VIN=10V - Validated with 5µH inductor; derates to 3.7A at 80% duty cycle due to slope compensation. |
| Switching Frequency | 500kHz ±8% - Enables use of small 1.8–5µH inductors and low-ESR ceramic output capacitors. |
| Switch On Resistance | 0.07Ω (typ) at 4.5A - Achieved via BOOST-driven saturation, reducing conduction loss and thermal stress vs. conventional bipolar designs. |
| Shutdown Current | 20µA (max) at VIN ≤ 32V - Ensures ultra-low quiescent drain in battery standby mode. |
| Thermal Resistance | θJA = 30°C/W - Measured with 0.5 in² copper area on backside ground plane; enables 4.25A operation without forced air. |
Pinout & Package
LT1374HVIS8#TRPBF is housed in an 8-lead plastic SOIC package (S8) with exposed pad for enhanced thermal dissipation. The exposed pad must be soldered to a PCB ground plane to achieve θJA = 30°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power collector | Supplies internal circuitry and powers NPN switch collector; requires local 100µF solid tantalum bypass near pin. |
| BOOST | Switch driver boost supply | Connected to VIN + 5V via external capacitor/diode; enables NPN saturation and 0.07Ω RON. |
| FGND | Power ground reference | Fused ground pin tied to exposed pad; must connect directly to large ground plane for thermal and EMI control. |
| VSW | Switch emitter node | Drives inductor; swings from GND to VIN during operation; requires low-inductance path to catch diode cathode. |
| VC | Error amplifier output | Controls peak switch current; used for loop compensation; clamps at 0.9V (off) and 2.1V (on). |
| BIAS | Efficiency-optimizing bias source | Accepts 3–7V external supply (e.g., 5V output); reduces VIN supply current by shifting bias sourcing. |
| SYNC/SHDN | Multi-function logic input | Configured as SHDN in this variant: 0.4V threshold forces micropower shutdown; 2.38V enables UVLO lockout. |
| SENSE | Fixed-output voltage sense | Internally connected to 5V output; replaces FB pin; provides 5.0V reference with ±1.2% tolerance over temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent stability with minimal external compensation components. |
| BOOST-driven NPN switch | Reduces switch conduction loss by 65% vs. non-boosted bipolar designs, enabling >89% efficiency at 4A. |
| Integrated cycle-by-cycle current limit | Guarantees 4.5A peak switch current protection independent of input/output conditions. |
| Thermal shutdown + UVLO | Prevents damage under overload or low-input conditions; 2.38V SHDN threshold ensures clean start-up above minimum VIN. |
| BIAS pin efficiency enhancement | Lowers total input supply current by >10% at VIN = 20V / IOUT = 25mA, critical for high-VIN portable applications. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Main 5V rail generation from 12V or 19V Li-ion battery packs in ultrabooks and tablets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V/4.25A to USB ports, SSD controllers, and PMIC inputs. Use Value: High efficiency (>89%) extends battery runtime; 500kHz switching allows compact 5µH inductor and ceramic output caps. |
Use Scenario: Power management in handheld test equipment, portable medical monitors, and ruggedized field instruments. IC Role / Device Role / Timing Role: Fixed 5V supply for microcontrollers, ADCs, and communication interfaces operating across wide temperature ranges (–40°C to 125°C). Use Value: HV rating (32V) accommodates 24V battery transients; 20µA shutdown current preserves battery charge during sleep modes. |
| Battery Chargers | Distributed Power |
Use Scenario: Secondary 5V output stage in multi-cell Li-ion charger ICs or standalone charging modules. IC Role / Device Role / Timing Role: Regulated 5V auxiliary supply for charger controller logic, display backlight drivers, and status LEDs. Use Value: Integrated current limiting and thermal shutdown prevent fault propagation during cell imbalance or short-circuit events. |
Use Scenario: Local point-of-load regulation in industrial PLCs, motor drives, and telecom line cards where 5V rails are distributed across PCBs. IC Role / Device Role / Timing Role: Compact, thermally robust 5V converter replacing discrete buck solutions with higher BOM count and lower reliability. Use Value: Exposed-pad SO-8 package achieves 30°C/W θJA with minimal copper area, enabling high-current density without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4A synchronous buck, 3–36V input, 5V fixed, 3MHz switching, no BOOST pin required. | Higher frequency enables smaller inductors but increases EMI sensitivity; lacks HV-rated 32V absolute max input. | Preferred for space-constrained designs needing <1µH inductors; not suitable for 32V transient environments. |
| TPS54332DR | 3.5A synchronous buck, 3.5–28V input, adjustable output, 600kHz, integrated FETs, no BIAS pin. | Lower max input (28V) and no BIAS pin reduce efficiency at high VIN/light load; requires external feedback resistors. | Cost-optimized alternative for non-HV 24V systems; requires additional components for fixed 5V output. |
Compared with LTC3605EDE#TRPBF and TPS54332DR, the LT1374HVIS8#TRPBF uniquely combines 32V absolute maximum input, fixed 5V SENSE-pin simplicity, BOOST-enhanced efficiency, and BIAS-enabled high-VIN optimization-making it optimal for ruggedized, high-reliability 5V POL applications where input transients and thermal constraints dominate.
Availability
LT1374HVIS8#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 guaranteed traceable sourcing.
Supply support for LT1374HVIS8#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 all LT-branded ICs.
The LT1374 family was designed as a high-efficiency, high-voltage monolithic buck regulator targeting portable and industrial power systems where thermal performance, input voltage robustness, and design simplicity are critical.
FAQ
What is the absolute maximum input voltage rating for the LT1374HVIS8#TRPBF?
The LT1374HVIS8#TRPBF has an absolute maximum input voltage rating of 32V, confirmed in the Absolute Maximum Ratings table. This HV rating distinguishes it from standard LT1374 variants (25V max) and supports operation in 24V battery systems with transient overvoltage margins. Operation above 32V risks permanent damage to the internal NPN switch and bias circuitry.
Does the LT1374HVIS8#TRPBF require an external feedback resistor network?
No, the LT1374HVIS8#TRPBF does not require an external feedback resistor network because it is the fixed 5V output variant (-5 suffix), which uses an internal resistor divider and the SENSE pin instead of FB. The SENSE pin connects directly to the 5V output and provides a precision 5.0V ±1.2% reference without external components.
How does the BOOST pin function in the LT1374HVIS8#TRPBF?
The BOOST pin in the LT1374HVIS8#TRPBF supplies a voltage ~5V above VIN to the base drive of the internal NPN power switch, enabling deep saturation and achieving a typical on-resistance of 0.07Ω. It requires an external flying capacitor and Schottky diode (e.g., MBRS330T3) connected between VIN and BOOST to generate this boosted voltage during each switching cycle.
What thermal performance can be expected from the LT1374HVIS8#TRPBF in SO-8 package?
The LT1374HVIS8#TRPBF achieves θJA = 30°C/W when its exposed pad is soldered to a 0.5 square inch copper area over an internal ground plane. This allows continuous 4.25A output at 5V with VIN = 10V and ambient temperature up to 85°C without forced airflow-verified in the Thermal Characteristics section of the datasheet.
Can the LT1374HVIS8#TRPBF be synchronized to an external clock?
No, the LT1374HVIS8#TRPBF cannot be synchronized to an external clock because its pin 7 is configured as SHDN (shutdown), not SYNC. Only -SYNC variants (e.g., LT1374HVIS8-SYNC) replace SHDN with SYNC functionality. Attempting to drive pin 7 as a sync signal will trigger shutdown instead of synchronization.
LT1374HVIS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 32V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 27.52V
- 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:
- 8-SO
LT1374HVIS8#TRPBF FAQ
1.How can I place an order for LT1374HVIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVIS8#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 LT1374HVIS8#TRPBF reliable?
The price and inventory of LT1374HVIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374HVIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVIS8#TRPBF?
LT1374HVIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVIS8#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 LT1374HVIS8#TRPBF?
For technical support, including LT1374HVIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVIS8#TRPBF requirements.
6.How does Aetrix verify that LT1374HVIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVIS8#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 LT1374HVIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374HVIS8#TRPBF?
All LT1374HVIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVIS8#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 LT1374HVIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1374HVIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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