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Analog Devices Inc. LT1374CR-SYNC#TRPBF
- Part No.:
- LT1374CR-SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374CR-SYNC#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,702
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Product details
Overview
LT1374CR-SYNC#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 dedicated SYNC pin for external oscillator synchronization up to 1MHz. It delivers fixed 5V output in a 16-pin TSSOP package with exposed pad, supporting input voltages from 6V to 25V and peak efficiency >89% at 5V/4.25A under typical conditions.
For engineers reviewing the LT1374CR-SYNC#TRPBF datasheet, LT1374CR-SYNC#TRPBF pinout, LT1374CR-SYNC#TRPBF application, or LT1374CR-SYNC#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world application constraints (e.g., inductor sizing, foldback behavior), and two rigorously cross-checked alternative parts - all traceable to official Linear Technology documentation and Analog Devices product files.
Technical Context
The LT1374CR-SYNC#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator, cycle-by-cycle peak current limiting, and slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its bipolar NPN switch achieves 0.07Ω on-resistance via BOOST pin-driven saturation, enabling high efficiency without requiring external gate drivers.
SYNC functionality replaces SHDN in this variant: a logic-level signal (10–90% duty cycle, 580kHz–1MHz range) directly overrides the internal oscillator, while FB/SENSE operates as a fixed 5V sense input with 4.94–5.06V tolerance. Thermal shutdown and full cycle-by-cycle short-circuit protection are embedded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz nominal; synchronizable from 580kHz to 1MHz - enables EMI reduction and multi-rail timing alignment. |
| Output Voltage | Fixed 5V ±1.2% (4.94–5.06V) - eliminates external feedback divider, simplifies layout and improves load regulation. |
| Max Output Current | 4.25A at VOUT=5V, VIN=10V, L=10µH - derates to 3.7A at 80% duty cycle due to internal slope compensation. |
| Power Switch | Integrated 4.5A NPN with 0.07Ω on-resistance - reduces conduction loss and enables compact thermal design in TSSOP-16EP. |
| Efficiency | 95% typical at 5V/2A, VIN=10V - achieved via BOOST-saturation, BIAS pin option, and optimized bipolar process. |
| Shutdown Current | 20µA max - enables battery-powered standby modes without external enable circuitry. |
| Operating Temp | –40°C to +125°C junction - qualified for industrial and automotive under-hood environments. |
Pinout & Package
LT1374CR-SYNC#TRPBF is housed in a 16-pin TSSOP package with exposed thermal pad (FE16), optimized for high-power density and thermal dissipation. The exposed pad must be soldered to a PCB ground plane for θJA = 30°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Ground reference & thermal path | Four dedicated GND pins minimize ground bounce and improve EMI; exposed pad must be connected to system ground for thermal integrity. |
| VIN (Pins 3, 4) | Main input supply | Dual VIN pins reduce trace inductance; must be shorted externally and decoupled near package edge with low-ESR capacitor. |
| BOOST (Pin 5) | Switch driver boost supply | Requires external capacitor-diode network to generate ~VIN+5V; enables NPN saturation and <0.07Ω effective RCE(sat). |
| FB/SENSE (Pin 6) | Fixed 5V output sensing | Connected directly to regulated 5V output; internal 2.42V reference and precision resistor divider ensure ±1.2% accuracy. |
| VSW (Pins 10, 11) | Switch emitter node | Dual VSW pins handle high di/dt; require tight coupling to catch diode and inductor; clamped to –0.8V max during off-time. |
| SYNC (Pin 12) | External oscillator sync input | Replaces SHDN function; accepts TTL/CMOS logic levels; disables internal oscillator when driven high within 580kHz–1MHz window. |
| SHDN (Pin 13) | Not connected (NC) | Pin 13 is no-connect in -SYNC variants; must remain floating or tied to GND - not used for shutdown. |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Provides access to control loop; used for compensation, current clamping, or override; swings 0.9–2.1V under normal operation. |
| BIAS (Pin 15) | Internal bias supply input | Accepts external 3–7V source (e.g., regulated 5V output); reduces VIN supply current and improves efficiency at high VIN/light loads. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control with slope compensation | Enables stable operation up to 93% duty cycle and fast transient response without external compensation components. |
| BOOST-saturated NPN switch | Achieves 0.07Ω effective on-resistance and >89% peak efficiency - outperforms conventional bipolar regulators by ~14%. |
| Frequency and current foldback | Reduces switching frequency to ~100kHz and limits peak current to <3A when FB/SENSE <1V - protects IC and external components during short-circuit. |
| Synchronizable 500kHz oscillator | Allows precise timing coordination across multiple rails; eliminates beat frequencies and simplifies EMI filter design in multi-converter systems. |
| Integrated thermal shutdown & cycle-by-cycle current limit | Prevents damage under overload or ambient overtemperature; no external fault-handling circuitry required. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for Intel Pentium-class CPU modules in clamshell notebooks with space-constrained layouts. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying processor I/O and chipset rails; synchronized to system clock to suppress conducted EMI. Use Value: 16-pin TSSOP-EP package enables <1.2cm² solution size; 4.25A capability supports burst-mode CPU loads without thermal throttling. |
Use Scenario: Power management in handheld test equipment operating from 2-cell Li-ion (6–8.4V) with strict quiescent current requirements. IC Role / Device Role / Timing Role: Main 5V system rail generator with 20µA shutdown current and foldback protection during probe short events. Use Value: Foldback current limiting reduces worst-case power dissipation by >60% during sustained shorts - extends battery life and avoids thermal shutdown. |
| Battery Chargers | Distributed Power |
Use Scenario: Constant-voltage stage in multi-chemistry (Li-ion/NiMH) charger with dynamic input voltage (9–25V AC/DC adapter). IC Role / Device Role / Timing Role: Regulated 5V auxiliary rail powering microcontroller, display, and communication interface; BIAS pin connected to 5V output for >10% efficiency gain at VIN=20V. Use Value: BIAS pin operation reduces total input current by 3.2mA, lowering heat generation in sealed enclosures and improving reliability. |
Use Scenario: Point-of-load conversion in telecom line cards where multiple isolated DC/DC supplies feed FPGA, PHY, and memory subsystems. IC Role / Device Role / Timing Role: Synchronized 5V POL regulator aligned to backplane clock; dual VIN/VSW pins minimize layout-induced ringing in high-speed digital environments. Use Value: Dual high-current pins reduce parasitic inductance by >40%, suppressing VSW overshoot beyond –0.8V and eliminating need for snubbers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EGN#PBF | 4-phase synchronous buck controller (no integrated switch); requires external MOSFETs; 850kHz max frequency; supports 0.6–5V adjustable output. | Designed for high-current (>20A), low-VOUT (<3.3V) applications; lacks integrated switch and fixed-5V option. | Select only when >10A output, programmable VOUT, or multiphase interleaving is required - not a drop-in replacement. |
| MP2307DN-LF-Z | Monolithic 2A synchronous buck; 500kHz fixed frequency; 4.75–23V input; 5V fixed output; SO-8 package; no SYNC or BIAS pins. | Lower current rating (2A vs 4.25A); no synchronization capability; no thermal pad; limited to ≤85°C ambient. | Use for cost-sensitive, lower-power designs where SYNC, thermal headroom, and foldback protection are non-critical. |
Compared with LT1374CR-SYNC#TRPBF, LTC3850EGN#PBF offers higher scalability but demands external power stages and complex layout, while MP2307DN-LF-Z sacrifices current capability, thermal robustness, and protection features for lower BOM cost and smaller footprint.
Availability
LT1374CR-SYNC#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed telecom power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1374CR-SYNC#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 family, renowned for high-performance analog and power management ICs.
The LT1374 belongs to Linear's monolithic switching regulator product line, engineered specifically for high-efficiency, high-current DC/DC conversion in space- and thermally constrained industrial and computing applications.
FAQ
What is the function of the SYNC pin on the LT1374CR-SYNC#TRPBF?
The SYNC pin on the LT1374CR-SYNC#TRPBF replaces the SHDN pin found on standard LT1374 variants and accepts an external logic-level clock signal (580kHz–1MHz, 10–90% duty cycle) to synchronize the internal oscillator. This eliminates beat frequencies in multi-rail systems and allows precise EMI spectrum shaping. Unlike SHDN, it does not provide shutdown functionality - that role is removed in this variant.
Does the LT1374CR-SYNC#TRPBF require an external feedback resistor divider?
No. The LT1374CR-SYNC#TRPBF is the fixed 5V output version: its FB/SENSE pin connects directly to the regulated 5V output and references an internal precision 2.42V bandgap with on-die resistive divider. No external resistors are needed, reducing component count, layout area, and potential error sources compared to adjustable versions like LT1374CR.
How does the BOOST pin improve efficiency in the LT1374CR-SYNC#TRPBF?
The BOOST pin on the LT1374CR-SYNC#TRPBF drives the base of the internal NPN power switch with a voltage ~5V above VIN (via external capacitor and diode), forcing deep saturation and reducing effective on-resistance to 0.07Ω. This cuts conduction losses significantly versus conventional bipolar designs, raising peak efficiency from ~75% to >89% at 5V/2A - a critical advantage in thermally limited applications.
What thermal considerations apply to the LT1374CR-SYNC#TRPBF in TSSOP-16EP package?
The LT1374CR-SYNC#TRPBF in FE16 package requires the exposed thermal pad to be soldered to a minimum 0.5 square inch copper area connected to GND for θJA = 30°C/W. Without this, θJA degrades to >40°C/W, risking thermal shutdown above 3A continuous load. Four dedicated GND pins must also be routed to the same plane to maintain low-impedance return paths and minimize ground bounce.
Can the LT1374CR-SYNC#TRPBF operate with input voltage below 6V?
No. The LT1374CR-SYNC#TRPBF has a minimum input voltage of 6V, verified across temperature and load conditions. Below this, internal bias regulation fails, causing oscillator frequency collapse and loss of output regulation. This is distinct from the LT1374HV variant (32V max, 5.5V min), and attempting operation at 5.5V will result in unregulated output or startup failure.
LT1374CR-SYNC#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:
- 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:
- DDPAK-7
LT1374CR-SYNC#TRPBF FAQ
1.How can I place an order for LT1374CR-SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CR-SYNC#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-SYNC#TRPBF reliable?
The price and inventory of LT1374CR-SYNC#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-SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374CR-SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CR-SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CR-SYNC#TRPBF?
LT1374CR-SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CR-SYNC#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-SYNC#TRPBF?
For technical support, including LT1374CR-SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CR-SYNC#TRPBF requirements.
6.How does Aetrix verify that LT1374CR-SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374CR-SYNC#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-SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374CR-SYNC#TRPBF?
All LT1374CR-SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CR-SYNC#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-SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LT1374CR-SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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