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Analog Devices Inc. LT1371HVIR#TRPBF
- Part No.:
- LT1371HVIR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1371HVIR#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,835
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Product details
Overview
LT1371HVIR#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 shutdown/synchronization logic. It operates from 2.7V input and regulates positive or negative outputs - used in laptop DC-DC supplies and dual-output flyback converters.
For engineers reviewing the LT1371HVIR#TRPBF datasheet, LT1371HVIR#TRPBF pinout, LT1371HVIR#TRPBF application, or LT1371HVIR#TRPBF equivalent, key selection considerations include its 42V switch rating, ±2.49V dual-reference architecture (FB/NFB), 12µA shutdown current, 500kHz fixed frequency, and TO-220-7 package thermal performance under industrial temperature range (–40°C to 125°C).
Technical Context
The LT1371HVIR#TRPBF implements current-mode control: switch duty cycle is set by comparing sensed switch current against a voltage-controlled threshold derived from the VC pin. This provides inherent line transient immunity, simplified loop compensation, and pulse-by-pulse overcurrent protection.
It features dual feedback paths - FB pin referenced to +1.245V for positive outputs, NFB pin referenced to –2.49V for negative outputs - sharing one error amplifier core. Oscillator frequency shifts 5:1 during overload (FB < 0.6V), and adaptive anti-saturation circuitry minimizes switch turn-off delay and driver loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Breakdown Voltage | 42V - enables operation with up to 36V input rails or high-voltage boost stages without external clamping. |
| Switch Current Limit | 3.0A typical - sets maximum peak inductor current; limits fault energy in short-circuit or overload conditions. |
| Reference Voltage (FB) | +1.245V ±15mV - defines output regulation point for positive configurations; sets resistor divider ratio for precise VOUT. |
| Negative Reference (NFB) | –2.490V ±50mV - enables direct negative output regulation without external op-amps or level-shifting networks. |
| Quiescent Supply Current | 4mA typical - supports low-power standby operation; reduces no-load losses in battery-powered systems. |
| Shutdown Current | 12µA typical - allows deep sleep mode; extends battery life in portable equipment during idle periods. |
| Switching Frequency | 500kHz ±50kHz - permits use of compact 4.7µH inductors; balances EMI, efficiency, and component size. |
| Operating Temperature | –40°C to 125°C junction - qualified for industrial environments; requires θJA ≤ 50°C/W mounting per TO-220-7 package. |
Pinout & Package
LT1371HVIR#TRPBF is housed in a 7-lead TO-220 package (T7) with exposed tab electrically connected to GND. Thermal resistance is θJA = 50°C/W (typical) and θJC = 4°C/W, requiring direct tab-to-ground-plane soldering or mechanical attachment for reliable power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Bypassed with ≥10µF low-ESR capacitor; enters undervoltage lockout below 2.5V. |
| S/S | Shutdown & Sync input | Logic-low (<0.6V) enables shutdown (12µA IQ); 600–800kHz AC signal synchronizes switching. |
| VSW | Switch collector node | Connects to inductor/diode; carries high di/dt current; requires shortest possible PCB trace. |
| GND | Power and signal ground | All GND pins and tab must connect to low-impedance ground plane to minimize noise and thermal rise. |
| NFB | Negative feedback input | Accepts resistor divider from negative output; regulates at –2.49V; bias current ≈ –30µA. |
| FB | Positive feedback input | Accepts resistor divider from positive output; regulates at +1.245V; bias current ≤ 550nA. |
| VC | Error amplifier output | Used for compensation (RC network), soft-start (capacitive clamp), and current limit adjustment. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage switch | 42V breakdown rating - supports 36V input applications and high-ratio boost converters without external FETs. |
| Dual-reference regulation | +1.245V (FB) and –2.49V (NFB) references - enables single-chip positive/negative output regulation without auxiliary amplifiers. |
| Nonlinear error amplifier | Transconductance increases 10× when FB exceeds VREF by 40mV - suppresses output overshoot during startup and load recovery. |
| Oscillator frequency shift | 5:1 reduction when FB < 0.6V - lowers switching frequency during overload to maintain control and protect external components. |
| Adaptive anti-saturation | Real-time driver current adjustment - minimizes switch saturation voltage and turn-off delay, improving efficiency and thermal margin. |
| Industrial temperature grade | –40°C to 125°C operating junction range - validated for harsh environments including industrial automation and transportation electronics. |
Applications
| Laptop Computer Power Supply | Dual-Output Flyback Converter |
|---|---|
Use Scenario: Generating isolated 12V and –5V rails from a 5V USB-C or battery source in ultraportable computing platforms. IC Role / Device Role / Timing Role: Primary controller implementing inverting and flyback topologies; regulates both outputs via FB and NFB pins simultaneously. Use Value: Eliminates need for separate negative LDO or charge pump; maintains tight cross-regulation using shared error amplifier and frequency-shift protection. |
Use Scenario: Providing main +15V and auxiliary –12V bias supplies for analog front-end circuits in industrial PLC modules. IC Role / Device Role / Timing Role: Single-controller solution managing two independent output voltages with overvoltage protection on both rails. Use Value: Reduces BOM count and layout area vs. dual-regulator approach; leverages internal 5:1 frequency shift to limit stress during output faults. |
| Inverting DC-DC Supply | High-Voltage Boost Converter |
Use Scenario: Converting 3.3V logic rail to –12V for RS-232 transceivers or op-amp biasing in embedded sensor nodes. IC Role / Device Role / Timing Role: Inverting topology controller using NFB pin as primary feedback; VC pin configured for soft-start. Use Value: Achieves regulated negative output without external inverting op-amp or transformer; maintains 4mA quiescent current in active mode. |
Use Scenario: Stepping up 12V automotive battery to 48V for LED drivers or camera modules in ADAS subsystems. IC Role / Device Role / Timing Role: High-ratio boost controller leveraging 42V switch rating and 500kHz switching to minimize inductor size. Use Value: Enables use of 4.7µH inductor instead of >22µH alternatives; sustains 3A peak switch current even at elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | 4-switch synchronous buck-boost controller; no integrated power switch; supports wider VIN (4V–36V) and higher efficiency (>95%). | Requires external MOSFETs and gate drivers; suited for high-current (>5A), high-efficiency applications where board space allows discrete FETs. | Select LTC3780EFE#PBF when efficiency >92% and output currents >4A are required; avoid if simplicity, low BOM count, or inverting capability are priorities. |
| LM5122MH/NOPB | Current-mode boost/buck-boost controller; 65V max VIN; no NFB pin or negative output support; 100kHz–1MHz programmable frequency. | Cannot regulate negative outputs natively; requires external op-amp for inverting configurations; better suited for high-input-voltage boost only. | Choose LM5122MH/NOPB for 24V–48V input boost designs needing programmable frequency and wide VIN range; not suitable for dual-polarity or low-quiescent applications. |
Compared with LTC3780EFE#PBF and LM5122MH/NOPB, LT1371HVIR#TRPBF uniquely integrates a 42V/3A switch and dual-reference feedback in a single TO-220 package, enabling compact inverting, flyback, and boost solutions without external FETs or level-shifting circuitry - critical for space-constrained industrial and portable designs.
Availability
LT1371HVIR#TRPBF is available at Aetrix Electronics and suitable for laptop power supplies, industrial dual-rail converters, inverting bias generators, and high-voltage boost applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1371HVIR#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 legacy Linear parts including the LT1371 family.
The LT1371HVIR#TRPBF belongs to Linear's high-voltage monolithic switching regulator product line, engineered for robust, low-component-count DC-DC conversion in industrial, computing, and communications systems where reliability and thermal resilience are essential.
FAQ
What is the maximum input voltage supported by the LT1371HVIR#TRPBF?
The LT1371HVIR#TRPBF supports a maximum supply voltage of 30V on the VIN pin. Its integrated power switch has a guaranteed 42V breakdown rating, allowing safe operation with input transients up to 42V and enabling high-ratio boost topologies where output exceeds input by large margins. This makes LT1371HVIR#TRPBF suitable for 24V industrial bus and 36V battery-derived applications.
How does the LT1371HVIR#TRPBF regulate negative output voltages?
The LT1371HVIR#TRPBF regulates negative outputs using its dedicated NFB pin, which references an internal –2.49V bandgap. A resistor divider connects from the negative output to NFB, while the FB pin remains open. The error amplifier drives FB to +1.245V, creating a virtual ground that forces regulation at the NFB-set voltage. This architecture avoids external op-amps and preserves the same compensation network used for positive outputs - a key feature of LT1371HVIR#TRPBF.
Can the LT1371HVIR#TRPBF be synchronized to an external clock?
Yes, the LT1371HVIR#TRPBF supports external synchronization via its S/S pin. When operated in the TO-220-7 (T7) package, this pin serves dual functions: logic-level shutdown (active low) and synchronization input. Driving S/S with a 600kHz–800kHz square wave locks the internal oscillator to the external source. A 12µs resettable delay prevents false shutdown during sync pulses - a design-specific behavior confirmed in the LT1371HVIR#TRPBF datasheet timing diagrams.
What is the purpose of the VC pin on the LT1371HVIR#TRPBF?
The VC pin on the LT1371HVIR#TRPBF is the output of the error amplifier and serves three critical functions: (1) frequency compensation via an RC network to stabilize the control loop, (2) soft-start control using a capacitive clamp to limit inrush current, and (3) adjustable current limiting by externally clamping VC voltage. During normal operation, VC sits between 1.0V and 1.9V depending on load - a direct indicator of regulation status and switch duty cycle in LT1371HVIR#TRPBF.
Does the LT1371HVIR#TRPBF require special layout considerations?
Yes, LT1371HVIR#TRPBF demands careful PCB layout due to its high di/dt switching node (VSW). Critical practices include: keeping VSW-to-diode-to-output-capacitor traces as short as possible; connecting all GND pins and the TO-220 tab directly to a solid ground plane; placing input and output capacitors near their respective pins; and routing the FB and NFB feedback traces away from noisy nodes. These steps minimize EMI, prevent oscillation, and ensure stable regulation - all explicitly called out in the LT1371HVIR#TRPBF application notes.
LT1371HVIR#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-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:
- DDPAK-7
LT1371HVIR#TRPBF FAQ
1.How can I place an order for LT1371HVIR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1371HVIR#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 LT1371HVIR#TRPBF reliable?
The price and inventory of LT1371HVIR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1371HVIR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1371HVIR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1371HVIR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1371HVIR#TRPBF?
LT1371HVIR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1371HVIR#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 LT1371HVIR#TRPBF?
For technical support, including LT1371HVIR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1371HVIR#TRPBF requirements.
6.How does Aetrix verify that LT1371HVIR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1371HVIR#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 LT1371HVIR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1371HVIR#TRPBF?
All LT1371HVIR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1371HVIR#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 LT1371HVIR#TRPBF part is unused and in its original packaging.
Return procedure for LT1371HVIR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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