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Analog Devices Inc. LT1374CR-5#PBF
- Part No.:
- LT1374CR-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374CR-5#PBF.pdf
- Description:
- IC REG BCK SEPIC 5V 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:305
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Product details
Overview
LT1374CR-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A monolithic buck 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 20µA shutdown current. Designed for high-efficiency DC/DC conversion in space-constrained battery-powered systems.
For engineers reviewing the LT1374CR-5#PBF datasheet, LT1374CR-5#PBF pinout, LT1374CR-5#PBF application, or LT1374CR-5#PBF equivalent, key selection considerations include its fixed 5V output, 6V–25V input range, thermal shutdown protection, SYNC/SHDN dual-function pin capability, and compatibility with low-profile surface-mount inductors down to 1.8µH.
Technical Context
The LT1374CR-5#PBF implements current-mode control with an internal 2.42V reference and dedicated SENSE pin (replacing FB) for fixed 5V regulation. Its bipolar NPN power switch is driven via BOOST pin voltage-typically VIN + 5V-to achieve saturation and minimize conduction loss.
It integrates oscillator, error amplifier (2000 µMho transconductance), slope compensation, and dual-threshold shutdown (2.38V UVLO, 0.4V deep shutdown). The 16-pin TSSOP exposes multiple GND, VIN, and VSW pins to reduce parasitic inductance and improve thermal dissipation via the exposed pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (4.94–5.06V), enabling direct replacement of linear regulators without external feedback resistors. |
| Max Output Current | 4.5A at ≤50% duty cycle; derates to ~4.3A at 62.5% duty cycle (VIN=8V→VOUT=5V), defining practical load limits in mid-input applications. |
| Switching Frequency | 500kHz ±8% (460–540kHz), enabling compact 1.8–10µH inductors and reducing EMI fundamental frequency versus lower-frequency alternatives. |
| Switch On-Resistance | 0.07Ω (typ), minimizing conduction loss at full load: <150mW switch dissipation at 4.5A, critical for thermally constrained layouts. |
| Shutdown Current | 20µA (max), supporting ultra-low-power sleep modes in portable devices without auxiliary enable circuitry. |
| Input Voltage Range | 6V to 25V, covering 2S–6S Li-ion battery packs and industrial 12V/24V rails while maintaining regulation across discharge curves. |
| SENSE Pin Voltage | 5.0V (typ), used directly as output voltage sense point-no divider required-simplifying layout and eliminating resistor tolerance errors. |
Pinout & Package
LT1374CR-5#PBF is housed in a 16-pin TSSOP package (FE16) with exposed thermal pad. This package supports high power density via multiple parallel pins for VIN, VSW, and GND, and enables efficient heat transfer to PCB ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference | Four dedicated ground connections minimize ground bounce and improve stability; exposed pad must be soldered to large copper area for thermal and EMI performance. |
| VIN (Pins 3, 4) | Main input supply | Dual VIN pins reduce trace inductance and voltage spikes during high dI/dt switching transitions; both must be shorted externally. |
| VSW (Pins 10, 11) | Switch emitter node | Dual VSW pins carry full inductor current; require tight coupling to catch diode and output capacitor to limit ringing and EMI. |
| BOOST (Pin 5) | Switch driver boost supply | Connects to external boost capacitor (e.g., 10nF) and diode; supplies >VIN voltage to saturate NPN switch and achieve 0.07Ω RON. |
| SENSE (Pin 6) | Fixed 5V output sensing | Replaces FB pin in -5 variants; connects directly to regulated 5V output; internal 2.42V reference compares against this node for regulation. |
| SYNC/SHDN (Pin 13) | Multi-function control | Logic-level input: <0.6V = shutdown (20µA IQ); >1.5V = synchronization (580–1000kHz); enables flexible system-level power sequencing or noise management. |
| VC (Pin 14) | Error amplifier output | Provides access to control loop node for compensation (capacitor/resistor to GND) or external current limiting; swings 0.9–2.1V under normal operation. |
| BIAS (Pin 15) | Efficiency-boosting bias supply | Accepts external 3–7V (e.g., 5V output) to power internal circuitry, reducing VIN supply current by ~4mA and improving efficiency at high VIN/light loads. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent cycle-by-cycle overcurrent protection without external sensing components. |
| Saturating NPN switch with BOOST drive | Achieves 0.07Ω effective on-resistance-equivalent to a low-RDS(on) MOSFET-while retaining bipolar speed and ruggedness. |
| Integrated slope compensation | Prevents subharmonic oscillation at duty cycles >50%, allowing stable operation up to 93% max duty cycle without external components. |
| Feedback foldback protection | Reduces switching frequency and peak current limit when output collapses (e.g., short-circuit), limiting power dissipation in IC and external components. |
| Thermal shutdown + UVLO | Combines junction temperature cutoff (TJ = 125°C) and 2.38V undervoltage lockout to prevent startup under marginal input conditions. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Main 5V rail generation from 2S–3S Li-ion battery (8–12.6V) in ultrabooks and tablets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering up to 4.5A to SoC I/O, USB controllers, and display interfaces. Use Value: 500kHz operation allows use of 3.3µH shielded inductors <3mm height, meeting strict Z-height constraints while maintaining >89% efficiency at 2A. |
Use Scenario: Powering microcontroller subsystems, sensors, and RF modules in handheld test equipment and IoT edge nodes. IC Role / Device Role / Timing Role: High-efficiency 5V source enabling extended runtime from single-cell or multi-cell primary batteries. Use Value: 20µA shutdown current extends shelf life; SYNC pin allows noise-sensitive RF sections to force switching away from critical receive bands. |
| Battery Chargers | Distributed Power |
Use Scenario: Providing isolated 5V bias for charger controller ICs and gate drivers in multi-bay Li-ion charging stations. IC Role / Device Role / Timing Role: Auxiliary supply regulating from intermediate 12V bus, independent of main charging path. Use Value: Fixed 5V output eliminates feedback resistor network; BOOST-driven switch ensures stable operation even with input sag during high-current charge phases. |
Use Scenario: Local 5V regulation at point-of-load in industrial PLC backplanes or telecom line cards with 12V/24V distributed rails. IC Role / Device Role / Timing Role: Compact, robust DC/DC converter replacing larger discrete solutions in high-vibration environments. Use Value: Exposed-pad TSSOP package provides superior thermal resistance (θJA ≈ 30°C/W with 0.5"² copper) versus SO-8, sustaining full 4.5A output in dense layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#PBF | 4A synchronous buck, 3MHz switching, integrated MOSFETs; no BOOST pin required; 2.5µA quiescent current. | Higher frequency enables smaller inductors/caps but increases switching loss above 2A; lacks cycle-by-cycle current limiting. | Preferred for ultra-compact, low-IQ designs where 4A suffices and synchronous rectification improves light-load efficiency. |
| TPS54560QPWPRQ1 | 5.5A synchronous buck, 100kHz–2.5MHz adjustable frequency, integrated FETs; 145µA operating current; AEC-Q100 qualified. | Wider input range (3.5–60V); automotive-grade reliability; requires external compensation; no dedicated SENSE pin (FB only). | Chosen for automotive body electronics or industrial systems requiring extended VIN range and qualification, accepting larger solution size. |
Compared with LTC3605EDE-5#PBF and TPS54560QPWPRQ1, the LT1374CR-5#PBF delivers higher peak current (4.5A vs. 4A/5.5A), unique BOOST-driven bipolar switch architecture for low conduction loss, and fixed 5V SENSE interface-making it optimal for cost-sensitive, thermally demanding 5V/4.5A applications where synchronous complexity or automotive qualification are unnecessary.
Availability
LT1374CR-5#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for LT1374CR-5#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 its legacy of high-performance analog and power management ICs with rigorous testing and long-term product support.
The LT1374CR-5#PBF belongs to Linear's monolithic buck regulator family designed for high-current, high-efficiency DC/DC conversion in space- and thermal-constrained applications where simplicity, ruggedness, and predictable performance are prioritized over ultra-low quiescent current or synchronous integration.
FAQ
What is the maximum continuous output current of the LT1374CR-5#PBF?
The LT1374CR-5#PBF delivers up to 4.5A continuous output current at duty cycles ≤50% (e.g., VIN ≥10V for 5V output). At higher duty cycles-such as VIN = 8V-the peak switch current derates to ~4.3A due to internal slope compensation. Thermal design using the exposed pad is essential to sustain full current in ambient temperatures above 60°C.
Can the LT1374CR-5#PBF be synchronized to an external clock?
Yes, the LT1374CR-5#PBF supports synchronization via its SYNC/SHDN pin (Pin 13). Applying a logic-high signal (>1.5V, 10–90% duty cycle) synchronizes the internal oscillator from its nominal 500kHz up to 1MHz. This feature allows noise-sensitive systems to avoid interference with RF bands or data acquisition windows-critical in mixed-signal applications using the LT1374CR-5#PBF.
How does the BOOST pin function in the LT1374CR-5#PBF?
The BOOST pin on the LT1374CR-5#PBF supplies a voltage higher than VIN (typically VIN + 5V via external capacitor and diode) to the base of the internal NPN power switch. This forces saturation, achieving an effective on-resistance of just 0.07Ω-comparable to a low-RDS(on) MOSFET-while retaining bipolar switching speed and ruggedness. Without BOOST, conduction losses would increase significantly.
Is external feedback compensation required for the LT1374CR-5#PBF?
Yes, the LT1374CR-5#PBF requires external compensation on the VC pin (Pin 14) to ensure loop stability. A typical network uses a series RC (e.g., 10kΩ + 1nF) from VC to GND, optionally with a small capacitor (e.g., 100pF) across the resistor for phase boost. Compensation values depend on inductor value, output capacitance, and load range-refer to the LT1374CR-5#PBF application schematics for validated configurations.
What protection features does the LT1374CR-5#PBF include?
The LT1374CR-5#PBF integrates cycle-by-cycle current limiting, thermal shutdown (125°C junction), undervoltage lockout (2.38V on SHDN), and foldback protection that reduces switching frequency and peak current during output shorts. These features protect both the LT1374CR-5#PBF and external components-including the inductor and catch diode-under fault conditions without requiring additional discrete protection circuitry.
LT1374CR-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- 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-5#PBF FAQ
1.How can I place an order for LT1374CR-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CR-5#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 LT1374CR-5#PBF reliable?
The price and inventory of LT1374CR-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CR-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1374CR-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CR-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CR-5#PBF?
LT1374CR-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CR-5#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 LT1374CR-5#PBF?
For technical support, including LT1374CR-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CR-5#PBF requirements.
6.How does Aetrix verify that LT1374CR-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374CR-5#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 LT1374CR-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1374CR-5#PBF?
All LT1374CR-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CR-5#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 LT1374CR-5#PBF part is unused and in its original packaging.
Return procedure for LT1374CR-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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