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Analog Devices Inc. LT1371HVCSW#TRPBF
- Part No.:
- LT1371HVCSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1371HVCSW#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,826
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Product details
Overview
LT1371HVCSW#TRPBF from Analog Devices (formerly Linear Technology) is a high-frequency current-mode switching regulator IC designed for boost, buck, flyback, inverting, and Cuk topologies. It integrates a 3A, 42V breakdown power switch, 500kHz oscillator, error amplifier with nonlinear transconductance, and dual feedback inputs (FB/NFB) for positive or negative output regulation. It operates from 2.7V input and delivers stable voltage conversion in laptop supplies and multi-output flyback systems.
For engineers reviewing the LT1371HVCSW#TRPBF datasheet, LT1371HVCSW#TRPBF pinout, LT1371HVCSW#TRPBF application, or LT1371HVCSW#TRPBF equivalent, key selection criteria include its 42V switch rating, ±2.49V dual-reference capability, 12µA shutdown current, 500kHz fixed switching frequency, and SO-20 wide-body package thermal performance under industrial ambient conditions.
Technical Context
The LT1371HVCSW#TRPBF uses current-mode control: switch duty cycle is set by real-time inductor current comparison against an error-amplifier-derived threshold, enabling fast line transient response and inherent pulse-by-pulse overcurrent protection. Its adaptive anti-saturation driver minimizes switch turn-off delay and conduction loss.
It supports dual feedback architectures: FB pin regulates positive outputs at 1.245V reference; NFB pin regulates negative outputs at –2.49V reference, sharing the same error amplifier core. Oscillator frequency shifts 5:1 during overload (FB < 0.6V), reducing stress on external components without requiring external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Breakdown Voltage | 42V - Enables operation with up to 36V input rails or high-voltage boost outputs without external clamping. |
| Switch Current Limit | 3.0A typical - Sets maximum inductor peak current; constrains design to ≤0.8A continuous output in 5V→12V boost per typical application. |
| Reference Voltage (FB) | 1.245V ±1.2% - Defines precision output setting point; resistor divider ratio directly determines regulated positive output voltage. |
| Negative Reference (NFB) | –2.490V ±2.0% - Enables direct regulation of negative rails (e.g., –5V, –12V) without inverting op-amps or charge pumps. |
| Quiescent Current | 4mA typical - Minimizes no-load power loss in battery-powered systems such as portable computing supplies. |
| Shutdown Current | 12µA typical - Allows deep sleep mode in host-controlled power management without auxiliary LDOs. |
| Switching Frequency | 500kHz ±10% - Permits use of compact 4.7µH inductors and reduces EMI fundamental below 1MHz for easier filtering. |
| Input Voltage Range | 2.7V to 25V - Supports single-cell Li-ion (2.7V cutoff) through 24V industrial rails without external pre-regulation. |
Pinout & Package
LT1371HVCSW#TRPBF is housed in a 20-lead plastic SO Wide (SW) package with exposed thermal pad (not electrically connected). Ground pins are distributed across four locations (pins 4–7, 14–17) to minimize ground impedance and improve thermal dissipation. Thermal resistance θJA is 50°C/W with standard PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Compensation / Soft-start / Current limit control | Error amplifier output; RC network here sets loop stability; clamping enables programmable soft-start and current limiting. |
| FB | Positive output voltage sense | Inverting input of main error amp; referenced to 1.245V; connects to resistor divider on positive output rail. |
| NFB | Negative output voltage sense | Inverting input of negative feedback amp; referenced to –2.49V; used exclusively for negative output regulation. |
| GND (x4) | Power and signal ground return | Four dedicated ground pins reduce ground bounce and improve EMI performance in high-dI/dt switching paths. |
| VIN | Input supply bypass node | Connect ≥10µF low-ESR capacitor here; undervoltage lockout activates below 2.5V to prevent erratic startup. |
| VSW | Switch collector node | High-current, high-dV/dt node; must be routed with minimal trace length to diode and output capacitor to limit ringing and radiation. |
| SHDN | Active-low shutdown control | Pull ≤0.6V to enter 12µA shutdown; tie to VIN or float for normal operation; logic-level compatible. |
| SYNC | External clock synchronization input | Accepts 600–800kHz square wave; overrides internal oscillator; prevents beat frequencies in multi-regulator systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reference regulation | Simultaneous support for +1.245V (FB) and –2.49V (NFB) references enables single-chip dual-polarity supplies without external amplifiers. |
| Nonlinear error amplifier transconductance | 10× gain increase when FB exceeds VREF by 40mV - suppresses output overshoot during startup and load recovery without external compensation. |
| Oscillator frequency shifting | 5:1 reduction when FB drops below 0.6V - lowers switch stress and improves reliability during sustained overload or short-circuit events. |
| Adaptive anti-saturation driver | Real-time adjustment of base drive to power switch - minimizes saturation voltage and ensures rapid turn-off even under high-current, high-temperature conditions. |
| Logic-compatible shutdown & sync | SHDN and SYNC pins accept standard CMOS/TTL levels - eliminates need for level-shifting circuitry in microcontroller-based power sequencing. |
Applications
| Laptop DC-DC Conversion | Industrial Dual-Rail Supplies |
|---|---|
Use Scenario: Generating 12V/0.7A from 5V USB-C PD source in ultraportable notebook subsystems. IC Role / Device Role / Timing Role: Primary boost controller managing energy transfer, output regulation, and dynamic load response. Use Value: 500kHz operation allows 4.7µH inductor and compact 22µF tantalum output caps, reducing board area by >35% vs. 100kHz alternatives. |
Use Scenario: Providing isolated ±12V rails for analog sensor front-ends in factory automation I/O modules. IC Role / Device Role / Timing Role: Flyback controller with dual feedback, regulating both polarities from single transformer secondary winding. Use Value: Shared error amplifier architecture ensures tight cross-regulation (<±3%) between rails without optocouplers or secondary-side controllers. |
| Medical Portable Imaging Power | Test Equipment Bias Generation |
Use Scenario: Generating –5V bias for CCD image sensor analog signal chain in handheld ultrasound devices. IC Role / Device Role / Timing Role: Inverting regulator using NFB pin to directly regulate negative output without external inverting op-amp. Use Value: –2.49V reference tolerance (±2%) and low 30µA NFB bias current enable <1% output error without trimming resistors. |
Use Scenario: Creating precise +15V/–15V tracking supplies for op-amp test fixtures in automated calibration systems. IC Role / Device Role / Timing Role: Synchronized dual-channel controller (via SYNC pin) ensuring matched switching edges across both rails. Use Value: External synchronization eliminates beat frequencies between channels, reducing measurement noise floor by 12dB in sensitive analog testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3573EFE#TRPBF | 60V switch rating, 2.5A switch, 2.2MHz switching, integrated Schottky diode; no NFB pin. | Higher frequency enables smaller magnetics but lacks native negative output regulation capability. | Select when board space is critical and only positive outputs are required; requires redesign for negative rails. |
| TPS55340RTER | 40V switch, 5A switch, 1.2MHz, integrated FET; supports FB-only regulation; no NFB or frequency shift. | Higher current and frequency, but no dual-reference architecture or overload frequency reduction. | Choose for higher output current (>1A) in single-rail boost applications where simplicity and integration outweigh negative rail needs. |
Compared with LT1371HVCSW#TRPBF, LT3573EFE#TRPBF offers higher integration and frequency but sacrifices negative output support, while TPS55340RTER provides greater current headroom but lacks the robust overload protection and dual-polarity flexibility essential for medical and industrial dual-rail designs.
Availability
LT1371HVCSW#TRPBF is available at Aetrix Electronics and suitable for laptop computer supplies, multiple-output flyback supplies, inverting supplies, and industrial dual-rail power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1371HVCSW#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 Linear legacy parts including the LT1371 family.
The LT1371HVCSW#TRPBF belongs to Linear's high-voltage monolithic switching regulator product line, engineered for rugged, flexible DC-DC conversion in portable, industrial, and medical equipment where dual-polarity outputs and reliable overload handling are critical.
FAQ
What is the maximum input voltage supported by the LT1371HVCSW#TRPBF?
The LT1371HVCSW#TRPBF supports a maximum input voltage of 25V under normal operating conditions. Its internal power switch has a guaranteed 42V breakdown rating, allowing safe operation with transient spikes up to 42V - a key differentiator from the standard LT1371 (35V switch) and essential for robustness in industrial 24V rail applications. This HV variant is specifically rated for higher input margin without derating.
Can the LT1371HVCSW#TRPBF regulate both positive and negative outputs simultaneously?
Yes, the LT1371HVCSW#TRPBF can regulate both positive and negative outputs simultaneously using its dual feedback architecture: the FB pin senses positive outputs referenced to 1.245V, while the NFB pin senses negative outputs referenced to –2.49V. When both pins are used - as in the "Dual Output Flyback Converter" reference design - the IC prevents either rail from exceeding its setpoint, providing cross-regulation without optocouplers or secondary controllers.
What is the purpose of the VC pin on the LT1371HVCSW#TRPBF?
The VC pin on the LT1371HVCSW#TRPBF serves three critical functions: it is the output of the error amplifier (for loop compensation), the input to the current comparator (for current limit setting), and the node for soft-start control. An RC network from VC to GND sets loop stability; clamping VC externally adjusts current limit; and coupling a capacitor to VC implements controlled soft-start - all without additional ICs or complex circuitry.
Does the LT1371HVCSW#TRPBF require external synchronization to operate?
No, the LT1371HVCSW#TRPBF operates autonomously with its internal 500kHz oscillator and does not require external synchronization. The SYNC pin is optional: driving it with a 600–800kHz logic signal overrides the internal clock for EMI reduction or channel alignment in multi-regulator systems. If unused, SYNC may be tied high, low, or left floating - no pull-up/down is required.
How does the LT1371HVCSW#TRPBF protect itself during output overload?
The LT1371HVCSW#TRPBF employs two coordinated protection mechanisms during overload: first, oscillator frequency shifts 5:1 downward when FB voltage falls below 0.6V, reducing switch stress and thermal buildup; second, pulse-by-pulse current limiting caps peak switch current at 3.0A typical. These features act concurrently - unlike simple shutdown - preserving regulation while limiting power dissipation and preventing thermal runaway.
LT1371HVCSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.245V
- Voltage - Output (Max):
- 42V (Switch)
- Current - Output:
- 3A (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
LT1371HVCSW#TRPBF FAQ
1.How can I place an order for LT1371HVCSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1371HVCSW#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 LT1371HVCSW#TRPBF reliable?
The price and inventory of LT1371HVCSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1371HVCSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1371HVCSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1371HVCSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1371HVCSW#TRPBF?
LT1371HVCSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1371HVCSW#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 LT1371HVCSW#TRPBF?
For technical support, including LT1371HVCSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1371HVCSW#TRPBF requirements.
6.How does Aetrix verify that LT1371HVCSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1371HVCSW#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 LT1371HVCSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1371HVCSW#TRPBF?
All LT1371HVCSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1371HVCSW#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 LT1371HVCSW#TRPBF part is unused and in its original packaging.
Return procedure for LT1371HVCSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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