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Analog Devices Inc. LT1371HVCR#TRPBF
- Part No.:
- LT1371HVCR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1371HVCR#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,195
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Product details
Overview
LT1371HVCR#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 500kHz current-mode switching regulator IC with integrated 3A power switch, designed for boost, buck, flyback, inverting, and Cuk topologies. It features 42V switch breakdown voltage, 2.7V minimum input voltage, 1.245V reference voltage, and 12µA shutdown current - enabling high-efficiency DC/DC conversion in space-constrained laptop and industrial power supplies.
For engineers reviewing the LT1371HVCR#TRPBF datasheet, LT1371HVCR#TRPBF pinout, LT1371HVCR#TRPBF application, or LT1371HVCR#TRPBF equivalent, key selection considerations include its HV-rated 42V switch, negative output regulation capability via NFB pin, external synchronization range (600–800kHz), nonlinear error amplifier transconductance for reduced startup overshoot, and thermal design constraints of the 7-lead DD package.
Technical Context
The LT1371HVCR#TRPBF implements current-mode control with adaptive anti-saturation driver circuitry to minimize switch turn-off time and driver dissipation. Its oscillator operates at 500kHz (±50kHz), with frequency shifting (5:1 reduction) triggered when FB voltage drops below 0.6V - enhancing overload protection.
It integrates dual feedback paths: FB pin regulates positive outputs using a 1.245V internal reference, while NFB pin enables direct negative output regulation at –2.49V with –30µA input bias. The VC pin serves as error amplifier output, supporting frequency compensation, soft-start, and current limit adjustment via external RC networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz typical; enables use of compact 4.7µH inductors and reduces EMI filter size. |
| Switch Breakdown Voltage | 42V (HV variant); supports higher input rails and transient robustness in industrial 24V systems. |
| Reference Voltage | 1.245V at FB pin; sets output voltage via resistor divider with ±1.2% tolerance over temperature. |
| Negative Reference Voltage | –2.49V at NFB pin; allows direct regulation of negative outputs without external op-amps. |
| Quiescent Current | 4mA typical; minimizes no-load power loss in battery-powered applications like laptops. |
| Shutdown Current | 12µA typical; enables ultra-low-power standby mode for energy-sensitive designs. |
| Output Switch Current Limit | 3.0A minimum at 50% duty cycle; defines maximum deliverable load current before foldback. |
| Error Amplifier Transconductance | 1500µmho typical; provides high loop gain for tight regulation and fast transient response. |
Pinout & Package
LT1371HVCR#TRPBF is housed in a 7-lead plastic DD (R) package with exposed tab for thermal conduction. The tab is internally connected to GND and must be soldered directly to a ground plane for θJA = 30°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB | Ground / Thermal Pad | Primary heat path; must be connected to large copper area for thermal management. |
| 1 - GND | Power Ground | Return path for internal regulators and logic; tie directly to ground plane. |
| 2 - VIN | Input Supply | Accepts 2.7V–25V; undervoltage lockout activates below 2.5V. |
| 3 - S/S | Shutdown & Sync | Logic-compatible dual-function pin: low = shutdown (12µA IQ); 600–800kHz AC = sync. |
| 4 - VSW | Switch Node | Collector of internal 3A NPN switch; carries high di/dt; requires shortest possible trace routing. |
| 5 - GND | Power Ground | Second ground connection; improves noise immunity and current return path separation. |
| 6 - NFB | Negative Feedback Input | Senses negative output via –2.49V reference; bias current = –30µA. |
| 7 - FB | Positive Feedback Input | Senses positive output via 1.245V reference; max loading = 250nA for stability. |
| 8 - VC | Error Amplifier Output | Compensation node: connects to RC network for loop stability, soft-start, and current limit control. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Switch | 42V breakdown rating enables operation from 24V industrial rails and withstands load-dump transients. |
| Negative Output Regulation | Integrated –2.49V NFB reference eliminates need for external inverting amplifier in dual-rail supplies. |
| Nonlinear Error Amplifier | Transconductance increases 10× when FB exceeds VREF by 40mV - suppressing startup/output recovery overshoot. |
| Oscillator Frequency Shifting | Reduces switching frequency 5:1 during overload (FB < 0.6V), limiting peak switch current and protecting external components. |
| External Synchronization | Accepts 600–800kHz logic-level sync signal on S/S pin - enables EMI reduction via fixed-frequency coordination. |
| Low Minimum Input Voltage | 2.7V start-up supports single-cell Li-ion (2.7–4.2V) and 3.3V system rail inputs without pre-regulation. |
Applications
| Laptop Computer Power Supply | Industrial Dual-Rail Converter |
|---|---|
Use Scenario: Generating isolated +12V and –12V from a 5V motherboard rail in portable computing systems. IC Role / Device Role / Timing Role: Primary controller in multiple-output flyback topology, regulating both polarities simultaneously using FB and NFB pins. Use Value: Eliminates need for separate negative charge-pump or inverting IC, reducing BOM count and PCB area by 30%. |
Use Scenario: Providing regulated ±15V for analog sensor front-ends and op-amp biasing in factory automation modules. IC Role / Device Role / Timing Role: Inverting regulator stage generating –15V from a 24V DC bus, leveraging HV rating for margin against supply ripple. Use Value: 42V switch rating ensures reliable operation under 24V bus transients up to 36V, avoiding external TVS clamping. |
| Automotive Body Control Module | Medical Portable Instrument Supply |
Use Scenario: Boosting 12V battery voltage to 24V for solenoid drivers in vehicle door-lock actuators. IC Role / Device Role / Timing Role: High-efficiency boost converter operating at 500kHz to minimize inductor size in constrained module housing. Use Value: 4mA quiescent current extends battery life during sleep mode; 3A switch handles 2A solenoid peak loads. |
Use Scenario: Generating stable +5V and –5V from a single 3.7V Li-ion cell for precision ADC reference and op-amp biasing. IC Role / Device Role / Timing Role: Low-input-voltage inverting regulator with soft-start (via VC pin) to prevent inrush into sensitive analog circuitry. Use Value: 2.7V minimum input enables full battery discharge down to 3.0V; 12µA shutdown current preserves battery for >1 year in standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872-1 | Fixed 500kHz frequency, no frequency shifting; 40V switch rating; requires external MOSFET. | Lacks integrated 3A switch and negative output regulation; suited for higher-efficiency discrete FET designs. | Select when efficiency >92% is required and board space allows external FET + driver. |
| LM5122 | 42V rated, current-mode, but 100–750kHz adjustable frequency; no NFB pin; 5V VREF instead of 1.245V. | Cannot regulate negative outputs natively; requires external inverter circuit for dual-rail applications. | Prefer when programmable frequency and wide input range (3.5–60V) outweigh need for integrated negative regulation. |
Compared with LTC3872-1 and LM5122, LT1371HVCR#TRPBF uniquely combines 42V switch rating, integrated 3A bipolar switch, native negative output support, and frequency-shifting overload protection - making it optimal for compact, dual-polarity, industrial-grade DC/DC designs where component count and transient resilience are critical.
Availability
LT1371HVCR#TRPBF is available at Aetrix Electronics and suitable for laptop computer supplies, industrial dual-rail converters, and automotive body control modules requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LT1371HVCR#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1371HV family was engineered for high-density, multi-topology DC/DC conversion in space- and efficiency-constrained applications - emphasizing integration (3A switch, dual feedback, sync/shutdown), HV robustness (42V), and ease of compensation (VC pin architecture).
FAQ
What is the maximum input voltage supported by the LT1371HVCR#TRPBF?
The LT1371HVCR#TRPBF supports a maximum supply voltage of 30V on the VIN pin. Its internal power switch has a guaranteed 42V breakdown voltage (BVSW), allowing safe operation with input transients up to 42V - a key differentiator from the standard LT1371 (35V). This makes LT1371HVCR#TRPBF suitable for 24V industrial systems with load-dump immunity requirements.
Can the LT1371HVCR#TRPBF regulate negative output voltages without external components?
Yes, the LT1371HVCR#TRPBF can directly regulate negative outputs using its dedicated NFB pin, which references –2.49V internally. When configured with an appropriate resistor divider on the NFB pin, LT1371HVCR#TRPBF achieves stable negative regulation - eliminating the need for external op-amps or inverting charge pumps. The FB pin remains unused in this configuration.
How does the LT1371HVCR#TRPBF handle overload or short-circuit conditions?
The LT1371HVCR#TRPBF employs two complementary protections: (1) pulse-by-pulse current limiting on its 3A switch, and (2) oscillator frequency shifting - reducing switching frequency 5:1 when FB voltage falls below 0.6V. This dual mechanism limits average power dissipation and prevents thermal runaway during sustained overload, unlike basic current-limit-only regulators.
What is the purpose of the VC pin on the LT1371HVCR#TRPBF, and how is it used?
The VC pin on LT1371HVCR#TRPBF is the error amplifier output and serves three critical functions: (1) frequency compensation (via RC network to GND), (2) soft-start (by coupling a capacitor to GND), and (3) current limit adjustment (by clamping VC voltage). During operation, VC voltage ranges from ~1.0V (light load) to ~1.9V (heavy load), directly controlling switch duty cycle.
Is the LT1371HVCR#TRPBF pin-compatible with other LT1371 variants?
Yes, LT1371HVCR#TRPBF shares identical pinout and footprint with all R-package LT1371 variants (e.g., LT1371CR, LT1371IR). The HV suffix denotes enhanced 42V switch rating but retains full electrical and mechanical compatibility - enabling drop-in replacement in existing designs where higher voltage margin is needed.
LT1371HVCR#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
LT1371HVCR#TRPBF FAQ
1.How can I place an order for LT1371HVCR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1371HVCR#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 LT1371HVCR#TRPBF reliable?
The price and inventory of LT1371HVCR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1371HVCR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1371HVCR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1371HVCR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1371HVCR#TRPBF?
LT1371HVCR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1371HVCR#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 LT1371HVCR#TRPBF?
For technical support, including LT1371HVCR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1371HVCR#TRPBF requirements.
6.How does Aetrix verify that LT1371HVCR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1371HVCR#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 LT1371HVCR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1371HVCR#TRPBF?
All LT1371HVCR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1371HVCR#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 LT1371HVCR#TRPBF part is unused and in its original packaging.
Return procedure for LT1371HVCR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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