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Analog Devices Inc. LT1374CR-5SYNC#TRPBF
- Part No.:
- LT1374CR-5SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374CR-5SYNC#TRPBF.pdf
- Description:
- IC REG BCK SEPIC 5V 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,556
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Product details
Overview
LT1374CR-5SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A synchronous step-down switching regulator in a 16-pin TSSOP package with exposed pad. It operates at a constant 500kHz switching frequency, features cycle-by-cycle current limiting, 0.07Ω switch on-resistance, and supports external synchronization up to 1MHz. It is designed for high-efficiency power conversion in space-constrained battery-powered systems.
For engineers reviewing the LT1374CR-5SYNC#TRPBF datasheet, LT1374CR-5SYNC#TRPBF pinout, LT1374CR-5SYNC#TRPBF application, or LT1374CR-5SYNC#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world design implications - all specific to the CR-5SYNC variant in FE16 (16-pin TSSOP) packaging.
Technical Context
The LT1374CR-5SYNC#TRPBF implements current-mode control with an internal 500kHz oscillator, enabling fast transient response and stable loop behavior across wide load and input ranges. Its bipolar NPN power switch is driven via the BOOST pin to achieve saturation, reducing conduction loss and supporting >89% efficiency at 5V/4.25A output.
This variant integrates fixed 5V regulation (SENSE pin), synchronization capability (replacing SHDN), and thermal shutdown. The FE16 package provides enhanced thermal performance (θJA = 40°C/W with exposed pad soldered to ground plane), and dual VIN/VSW pins are internally shorted on PCB per datasheet layout guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (SENSE pin referenced; no external divider required) |
| Max Output Current | 4.25A at VOUT=5V, VIN=10V, L=5µH (continuous mode; derates with duty cycle) |
| Switching Frequency | 500kHz nominal; synchronizable from 580kHz to 1MHz via SYNC pin |
| Power Switch RON | 0.07Ω typical (enables low conduction loss; measured at ISW = 4.5A) |
| Efficiency | 95% typical at 5V/2A, VIN=10V (with MBRS330T3 diode and 10µH inductor) |
| Shutdown Current | 20µA max (achieved when SYNC pin held low; no SHDN pin present) |
| Operating Input Range | 6V to 25V (minimum start-up VIN = 5.5V; requires BOOST ≥ 2.3V above VIN) |
Pinout & Package
LT1374CR-5SYNC#TRPBF is housed in a 16-pin TSSOP package (FE16) with exposed thermal pad. Pin assignments are validated per Linear Technology's official FE16 package drawing and functional description for -SYNC variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Four dedicated GND pins minimize ground impedance; exposed pad must be soldered to PCB ground plane for thermal and EMI control |
| VIN (Pins 3, 4) | Main input supply connection | Dual VIN pins must be shorted externally on PCB; carries high dI/dt during switching; requires local 100µF solid tantalum bypass |
| BOOST (Pin 5) | Switch driver voltage boost node | Connected to external capacitor-diode network; enables NPN saturation; minimum voltage = VIN + 2.3V |
| FB/SENSE (Pin 6) | Fixed-output voltage sense input | Internally connected to 5V output; replaces FB function of adjustable parts; used for foldback protection below 1V |
| VSW (Pins 10, 11) | Switch emitter output | Dual VSW pins must be shorted externally; drives inductor; clamped to –0.8V min by external catch diode |
| SYNC (Pin 12) | External oscillator synchronization input | Replaces SHDN function; TTL/CMOS compatible; 10–90% duty cycle; enables frequency shift from 580kHz to 1MHz |
| SHDN (N/A) | Not present | Function replaced by SYNC; no shutdown capability unless SYNC is pulled low (20µA quiescent) |
| VC (Pin 14) | Error amplifier output / current limit control | Used for compensation; also serves as current clamp point; sits at ~1V (light load) to ~2V (full load) |
| BIAS (Pin 15) | Internal bias supply auxiliary input | Connect to regulated 5V output to improve efficiency at high VIN; not required but recommended for VIN > 12V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with integrated SENSE | Eliminates external resistor divider; reduces BOM count and layout sensitivity while maintaining ±1.2% accuracy over temperature |
| Synchronization capability (580kHz–1MHz) | Enables noise-sensitive system-level clock alignment; avoids beat frequencies in multi-rail power systems |
| Current-mode control with slope compensation | Ensures stability across full duty cycle range (up to 93%); prevents subharmonic oscillation without sacrificing peak current capability |
| Thermal-enhanced FE16 package | Exposed pad and four GND pins reduce θJA to 40°C/W; supports 4.25A continuous output without forced air |
| Foldback protection (frequency & current) | Reduces switching frequency and peak current limit when output collapses below 1V; limits power dissipation during short-circuit events |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Main 5V rail for CPU I/O, USB peripherals, and display logic in ultra-thin notebooks. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V from 12V or 19V battery-derived input. Use Value: High 500kHz frequency enables compact 5µH inductor; 95% efficiency extends runtime; SYNC allows co-timing with system clock to reduce EMI. |
Use Scenario: Power management in handheld test equipment with Li-ion battery input (8–16V). IC Role / Device Role / Timing Role: Fixed 5V supply for microcontroller, ADC, and communication ICs. Use Value: Foldback protection sustains operation during probe shorts; FE16 thermal design ensures reliability in sealed enclosures without heatsinks. |
| Battery Chargers | Distributed Power Architectures |
Use Scenario: Auxiliary 5V rail in multi-cell Li-ion charger modules powering fuel gauges and status LEDs. IC Role / Device Role / Timing Role: Secondary regulated output derived from main charging bus (12–24V). Use Value: 6V–25V input range accommodates varying bus voltages; BIAS pin connection to 5V output improves efficiency by >10% at VIN = 20V. |
Use Scenario: Point-of-load (POL) conversion in industrial PLC backplanes where 12V or 24V intermediate bus supplies multiple 5V subsystems. IC Role / Device Role / Timing Role: Local DC/DC regulator providing isolated 5V for sensor interface cards. Use Value: SYNC pin enables synchronized switching across multiple LT1374CR-5SYNC#TRPBF units, minimizing aggregate input ripple and easing bulk capacitor selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE-5#PBF | Monolithic 5V buck; 3A max; 3MHz switching; no SYNC; uses MOSFET switch | Higher frequency enables smaller passives but lower current rating; no synchronization support | Select when board space is critical and 3A suffices; avoid if system-level clock alignment or >4A is required |
| TPS54560QDGQRQ1 | Automotive-grade 5V buck; 5A; 100kHz–2.5MHz adjustable freq; integrated FET; no fixed-5V option | Requires external feedback resistors; wider temp range (–40°C to 150°C); AEC-Q100 qualified | Select for automotive environments requiring qualification; use only if adjustable output and layout flexibility are acceptable |
Compared with LTC3631EMSE-5#PBF and TPS54560QDGQRQ1, the LT1374CR-5SYNC#TRPBF uniquely combines fixed 5V output, 4.5A capability, and synchronization in a thermally robust TSSOP package - making it optimal for non-automotive industrial and portable designs demanding precise timing control and high current density.
Availability
LT1374CR-5SYNC#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power architectures requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LT1374CR-5SYNC#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 technical and manufacturing continuity for the LT product line. Linear pioneered high-performance analog and power ICs with emphasis on precision, speed, and integration.
The LT1374 family was designed specifically for high-current, high-frequency DC/DC conversion in space- and efficiency-constrained applications - emphasizing thermal robustness, synchronization capability, and fault resilience without external complexity.
FAQ
What is the maximum continuous output current for LT1374CR-5SYNC#TRPBF at 5V output?
The LT1374CR-5SYNC#TRPBF delivers up to 4.25A continuously at 5V output when VIN = 10V and L = 5µH, per the "Maximum Load Current at VOUT = 5V" graph in the datasheet. Current capability decreases at higher VIN due to increased inductor ripple and duty-cycle-dependent switch current derating - e.g., ~3.7A at VIN = 15V with same inductor. Thermal design using the exposed pad is essential to sustain this rating.
Does LT1374CR-5SYNC#TRPBF support true shutdown, or is sync-only functionality active?
The LT1374CR-5SYNC#TRPBF does not include a dedicated SHDN pin; the -SYNC option replaces it with the SYNC function. However, pulling the SYNC pin low (≤0.6V) forces the device into micropower shutdown, reducing supply current to 20µA - identical to the shutdown behavior of non-SYNC variants. This is confirmed in the Electrical Characteristics table under "Shutdown Supply Current" for SYNC-replaced parts.
Can the BIAS pin on LT1374CR-5SYNC#TRPBF be left unconnected?
Yes, the BIAS pin on LT1374CR-5SYNC#TRPBF may be left floating, as the device will draw bias current from VIN by default. However, connecting BIAS to the regulated 5V output improves efficiency by >10% at high input voltages (e.g., VIN = 20V), since internal circuitry then draws power from the lower-voltage rail. This is explicitly recommended in the Applications Information section for VIN > 12V operation.
What is the purpose of the dual VIN and dual VSW pins on LT1374CR-5SYNC#TRPBF?
The dual VIN (Pins 3,4) and dual VSW (Pins 10,11) pins on LT1374CR-5SYNC#TRPBF are provided to reduce parasitic inductance in high-dI/dt paths. Per the datasheet, both VIN pins must be shorted together on the PCB, as must both VSW pins. This minimizes voltage spikes during switch turn-off and improves thermal distribution across the package - critical for sustaining 4.5A peak switch current in the FE16 footprint.
Is LT1374CR-5SYNC#TRPBF RoHS compliant and lead-free?
Yes, LT1374CR-5SYNC#TRPBF is RoHS compliant and lead-free. The #TRPBF suffix denotes tape-and-reel packaging, Pb-free (lead-free) finish, and adherence to JEDEC J-STD-020 moisture sensitivity level 3 (MSL3). This is confirmed in Analog Devices' official part marking and packaging documentation for the FE16 variant.
LT1374CR-5SYNC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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:
- DDPAK-7
LT1374CR-5SYNC#TRPBF FAQ
1.How can I place an order for LT1374CR-5SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CR-5SYNC#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 LT1374CR-5SYNC#TRPBF reliable?
The price and inventory of LT1374CR-5SYNC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CR-5SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374CR-5SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CR-5SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CR-5SYNC#TRPBF?
LT1374CR-5SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CR-5SYNC#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 LT1374CR-5SYNC#TRPBF?
For technical support, including LT1374CR-5SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CR-5SYNC#TRPBF requirements.
6.How does Aetrix verify that LT1374CR-5SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374CR-5SYNC#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 LT1374CR-5SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374CR-5SYNC#TRPBF?
All LT1374CR-5SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CR-5SYNC#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 LT1374CR-5SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LT1374CR-5SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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