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Analog Devices Inc. LT1371HVCR#PBF
- Part No.:
- LT1371HVCR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1371HVCR#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
LT1371HVCR#PBF 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 supports input voltages from 2.7V to 30V, delivers up to 3A switch current, regulates both positive and negative outputs, and features 12µA shutdown current and external synchronization capability - used in laptop power supplies and multi-output flyback converters.
For engineers reviewing the LT1371HVCR#PBF datasheet, LT1371HVCR#PBF pinout, LT1371HVCR#PBF application, or LT1371HVCR#PBF equivalent, key selection considerations include its 42V switch breakdown voltage (HV variant), dual feedback architecture (FB/NFB), VC pin-based soft-start and compensation, and compatibility with surface-mount 4.7µH inductors in compact DC/DC designs.
Technical Context
The LT1371HVCR#PBF implements current-mode control with adaptive anti-saturation driver circuitry, enabling fast switch turn-off and reduced driver dissipation. Its error amplifier features nonlinear transconductance (1100–1900 µmho) that increases 10× above 40mV FB overvoltage to suppress startup overshoot.
Oscillator frequency shifts 5:1 under overload (FB < 0.6V), protecting external components; the VC pin serves simultaneously as error amplifier output, current limit control point, and soft-start node. The HV variant extends switch breakdown voltage to 42V while maintaining identical pinout and functional behavior as the standard LT1371CR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 450–550 kHz typical; enables use of small 4.7µH inductors and reduces filter size. |
| Output Switch Breakdown Voltage | 42 V (HV variant); supports higher input rails or transient-tolerant designs vs. 35V standard version. |
| Integrated Switch Current Limit | 3.0–5.4 A; provides pulse-by-pulse protection without external sensing resistors. |
| Reference Voltage (FB) | 1.245 V ±15 mV; sets output voltage via resistor divider; low drift (0.03%/V line regulation). |
| Negative Reference (NFB) | –2.490 V ±50 mV; enables direct negative output regulation without external op-amps. |
| Quiescent Supply Current | 4 mA typical; minimizes no-load power loss in battery-powered systems. |
| Shutdown Current | 12 µA typical; allows ultra-low-power standby in portable applications. |
Pinout & Package
LT1371HVCR#PBF is housed in a 7-lead plastic DD (R) package with exposed thermal tab. Pin 1 is VC, Pin 2 is FB, Pin 3 is NFB, Pin 4 is GND, Pin 5 is VIN, Pin 6 is S/S, Pin 7 is VSW. The tab is internally connected to GND and must be soldered directly to a ground plane for thermal management (θJA = 30°C/W with 0.5 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Accepts RC network for loop compensation; clamping controls soft-start and current limit; voltage range 1.0–1.9V during regulation. |
| FB (Pin 2) | Positive output voltage sense input | Connected to resistor divider for +VOUT regulation; bias current ≤550 nA; max load 250 µA when NFB active. |
| NFB (Pin 3) | Negative output voltage sense input | Sets –VOUT via resistor divider; reference = –2.49 V; bias current ≈ –30 µA; requires R2 = 2.49 kΩ for accuracy. |
| GND (Pin 4) | Power and signal ground reference | All ground pins (including tab) must connect to low-impedance ground plane; critical for EMI and thermal performance. |
| VIN (Pin 5) | Main input supply input | Operates from 2.7V to 30V; internal UVLO trips at ~2.5V; bypass with ≥10 µF low-ESR capacitor. |
| S/S (Pin 6) | Shutdown and synchronization input | Active-low shutdown (threshold ~1.3 V); also accepts 600–800 kHz sync signal; floating = normal operation. |
| VSW (Pin 7) | Switch collector node | High-current (3A peak) switching node; requires shortest possible trace to diode and output capacitor to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control architecture | Enables immediate line transient response, simplified compensation, and inherent pulse-by-pulse current limiting. |
| Dual feedback capability (FB + NFB) | Allows single IC to regulate both positive and negative outputs simultaneously - e.g., ±12V flyback supplies. |
| Nonlinear error amplifier transconductance | Increases 10× above 40mV FB overvoltage, reducing output overshoot during startup and load recovery. |
| 5:1 oscillator frequency shift under overload | Reduces switching frequency when FB < 0.6V, lowering stress on external components during fault conditions. |
| HV-rated 42V switch breakdown | Supports wider input voltage range and higher transient immunity than standard 35V version (LT1371CR). |
Applications
| Laptop Computer Power Supply | Industrial Dual-Polarity Flyback Supply |
|---|---|
Use Scenario: Step-up conversion from 5V USB-C or battery to 12V system rail in portable computing devices. IC Role / Device Role / Timing Role: Primary controller in non-isolated boost topology; manages PWM duty cycle, current limiting, and soft-start sequencing. Use Value: Enables compact, high-efficiency design using 4.7µH inductor and low-profile tantalum output capacitors; 4mA quiescent current extends battery runtime. |
Use Scenario: Isolated dual-output flyback converter delivering +15V and –15V for analog sensor front-ends in factory automation equipment. IC Role / Device Role / Timing Role: Regulates both outputs via simultaneous FB and NFB feedback; uses oscillator frequency shifting to maintain stability under unbalanced loading. Use Value: Eliminates need for secondary-side regulators or optocouplers; maintains ±1% output accuracy across –40°C to 85°C ambient. |
| Inverting DC/DC Converter | High-Voltage Boost for LED Drivers |
Use Scenario: Generating –5V from 3.3V logic rail in mixed-signal PCBs with space-constrained layouts. IC Role / Device Role / Timing Role: Configured in inverting topology; NFB pin referenced to –2.49V bandgap; FB pin left open. Use Value: Achieves clean negative output without external op-amp or charge pump; minimal BOM count and layout area. |
Use Scenario: Driving series-connected white LEDs requiring 36V from 12V automotive supply in interior lighting modules. IC Role / Device Role / Timing Role: High-voltage boost controller; leverages 42V switch rating to tolerate 12V transients up to 24V without derating. Use Value: Supports robust operation in automotive environments; 3A switch handles peak LED currents during PWM dimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1371CR#PBF | 35V switch breakdown (vs. 42V); otherwise identical pinout, features, and electrical specs. | Not suitable for >35V input or high-transient environments; lower margin for automotive or industrial surge testing. | Select LT1371CR#PBF only if input voltage remains ≤30V with ample transient headroom. |
| LT3573EDD#PBF | Higher integration: includes internal 1.5A switch, 2.5MHz switching, and built-in soft-start; different pinout and compensation scheme. | Targets smaller, higher-frequency designs; lacks NFB pin and dual-polarity support; not drop-in compatible. | Choose LT3573EDD#PBF for space-constrained, low-output-current apps where dual feedback is unnecessary. |
Compared with LT1371CR#PBF, the LT1371HVCR#PBF adds 7V switch voltage margin for improved reliability in noisy or high-input-rail systems; versus LT3573EDD#PBF, it retains full dual-feedback flexibility and higher current capability but requires external compensation and operates at lower frequency.
Availability
LT1371HVCR#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, industrial dual-polarity flyback supplies, and inverting DC/DC converters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1371HVCR#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 continues its legacy of high-performance analog and power management ICs. The company focuses on precision signal chain and power solutions for industrial, automotive, and communications markets.
The LT1371HVCR#PBF belongs to Linear's legacy high-efficiency current-mode switching regulator product line, engineered specifically for flexible topology support (boost/buck/flyback/inverting), wide input range, and dual-polarity regulation in space- and cost-sensitive power systems.
FAQ
What is the maximum input voltage rating for the LT1371HVCR#PBF?
The LT1371HVCR#PBF has a maximum supply voltage (VIN) rating of 30V and a switch breakdown voltage of 42V. This HV rating distinguishes it from the standard LT1371CR#PBF (35V switch), making LT1371HVCR#PBF suitable for applications with higher input transients or extended input ranges up to 30V nominal. Exceeding 30V on VIN risks damage to internal circuitry despite the higher switch rating.
Can the LT1371HVCR#PBF regulate both positive and negative outputs simultaneously?
Yes, the LT1371HVCR#PBF can regulate both polarities simultaneously using its dedicated FB and NFB pins. In dual-output flyback configurations, the FB pin senses the positive output against +1.245V reference, while the NFB pin senses the negative output against –2.49V reference. The IC dynamically adjusts duty cycle to prevent either output from exceeding its setpoint - a capability confirmed in the LT1371 datasheet Figure 2 and Applications Information section.
What is the function of the VC pin on the LT1371HVCR#PBF?
The VC pin on the LT1371HVCR#PBF is the output of the error amplifier and serves three critical functions: (1) loop compensation node (accepts RC network), (2) soft-start control point (capacitor coupling enables controlled ramp-up), and (3) current limit adjustment node (external clamp lowers effective current threshold). During regulation, VC voltage ranges from ~1.0V (light load) to ~1.9V (heavy load), and pulling it below 0.8V forces shutdown.
Does the LT1371HVCR#PBF support external clock synchronization?
Yes, the LT1371HVCR#PBF supports external synchronization via its S/S pin (Pin 6), which accepts logic-level signals from 600kHz to 800kHz. This allows precise timing alignment with other switching regulators to reduce beat frequencies and EMI. The S/S pin is dual-function: a logic-low signal places LT1371HVCR#PBF in shutdown (12µA IQ), while an AC-coupled square wave synchronizes switching - no additional components required.
What package type and thermal characteristics does the LT1371HVCR#PBF have?
The LT1371HVCR#PBF uses a 7-lead plastic DD (R) package with exposed GND tab. With 0.5 in² copper area on the backside ground plane, its thermal resistance is θJA = 30°C/W. The tab must be soldered directly to the ground plane for effective heat dissipation; improper mounting can raise junction temperature beyond the 125°C maximum, triggering thermal shutdown or reliability degradation in continuous 3A operation.
LT1371HVCR#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-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#PBF FAQ
1.How can I place an order for LT1371HVCR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1371HVCR#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 LT1371HVCR#PBF reliable?
The price and inventory of LT1371HVCR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1371HVCR#PBF is usually 5 days.
3.What payment methods are accepted for LT1371HVCR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1371HVCR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1371HVCR#PBF?
LT1371HVCR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1371HVCR#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 LT1371HVCR#PBF?
For technical support, including LT1371HVCR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1371HVCR#PBF requirements.
6.How does Aetrix verify that LT1371HVCR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1371HVCR#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 LT1371HVCR#PBF meets industry standards.
7.What is the process for return or replacement of LT1371HVCR#PBF?
All LT1371HVCR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1371HVCR#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 LT1371HVCR#PBF part is unused and in its original packaging.
Return procedure for LT1371HVCR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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