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Analog Devices Inc. LT1371HVISW#TRPBF
- Part No.:
- LT1371HVISW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1371HVISW#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,578
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Product details
Overview
LT1371HVISW#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 ±2.49V dual-reference architecture (1.245V FB / –2.49V NFB), 2.7V minimum input voltage, 4mA typical quiescent current, and regulates both positive and negative outputs - used in laptop DC-DC supplies and dual-polarity flyback converters.
For engineers reviewing the LT1371HVISW#TRPBF datasheet, LT1371HVISW#TRPBF pinout, LT1371HVISW#TRPBF application, or LT1371HVISW#TRPBF equivalent, key selection considerations include its 500kHz fixed-frequency operation, 3A internal switch with 0.45Ω max RDS(on), dual feedback capability (FB/NFB), shutdown current of 12µA, and SO-20 wide-body package thermal performance (θJA = 50°C/W).
Technical Context
The LT1371HVISW#TRPBF implements peak-current-mode control with adaptive anti-saturation driver logic, enabling fast transient response and inherent pulse-by-pulse current limiting. Its error amplifier features nonlinear transconductance (1100–1900 µmho) that increases 10× above 40mV error to suppress startup/overload overshoot.
Oscillator frequency shifting (5:1 reduction below 0.6V FB) protects external components during overload; synchronization range is 600–800kHz via dedicated SYNC pin; and VC pin serves triple function - compensation node, soft-start control point, and current-limit adjustment interface - with 0.8–1.25V threshold for idle mode entry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz nominal; enables use of compact 4.7µH inductors and reduces EMI filter size. |
| Integrated Switch Current Limit | 3.0 A min (duty cycle = 50%); supports up to ~0.8A output in 5V→12V boost with standard layout. |
| Reference Voltage (FB) | 1.245 V ±15 mV; sets positive output voltage via resistor divider without requiring external reference. |
| Negative Reference (NFB) | –2.490 V ±50 mV; enables direct regulation of negative rails without auxiliary op-amps or level shifters. |
| Quiescent Current | 4 mA typical; maintains high light-load efficiency in battery-powered systems like laptops. |
| Shutdown Supply Current | 12 µA typical; allows ultra-low-power standby in portable equipment with logic-controlled disable. |
| Input Voltage Range | 2.7 V to 25 V; supports single-cell Li-ion (2.7V cutoff) through multi-cell industrial inputs. |
| Output Switch RDS(on) | 0.45 Ω max at 2A; limits conduction loss to <180 mW at full switch current, easing thermal design. |
Pinout & Package
LT1371HVISW#TRPBF is housed in a 20-lead plastic SO Wide (SW) package with exposed thermal pad (pin 4–7 and 14–17 as GND). Thermal resistance is θJA = 50°C/W (typical, double-sided board with 0.75 in² copper), θJC = 4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier output / compensation node | Accepts RC network for loop stability; clamping controls soft-start and current limit; voltage range 0.8–1.9V reflects load condition. |
| FB | Positive output voltage sense input | Connects to resistor divider for +VOUT regulation; bias current ≤550 nA minimizes divider error. |
| NFB | Negative output voltage sense input | Connects to divider for –VOUT regulation; –30 µA bias current must be compensated in R1/R2 calculation. |
| VIN | Input supply bypass terminal | Requires ≥10 µF low-ESR capacitor; UVLO activates below 2.5 V to prevent erratic operation. |
| VSW | Switch collector node | Carries high di/dt current; requires shortest possible trace to diode/capacitor to minimize EMI and ringing. |
| GND (Pins 4–7, 14–17) | Power and signal ground return | All GND pins must connect to low-impedance ground plane; thermal path flows through these pins in SW package. |
| SHDN | Active-low enable/disable control | Pull ≤0.6 V to enter 12 µA shutdown; threshold is 1.3 V typical; no external pull-up required. |
| SYNC | External clock synchronization input | Accepts 600–800 kHz square wave; allows EMI reduction via frequency alignment with system clocks. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reference regulation | Simultaneous +1.245 V (FB) and –2.49 V (NFB) references enable single-chip dual-polarity output control without external amplifiers. |
| Nonlinear error amplifier transconductance | Transconductance jumps 10× when FB error exceeds 40 mV, reducing output overshoot during startup and load recovery by >50%. |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB drops below 0.6 V, lowering peak switch current and protecting inductor/diode during overload. |
| Adaptive anti-saturation driver | Dynamically adjusts base drive to minimize switch saturation time, cutting turn-off delay and reducing driver dissipation by ~30%. |
| Logic-compatible synchronization | SYNC pin accepts standard CMOS/TTL levels; eliminates need for level-shifting circuitry when aligning to system clocks. |
| Low minimum input voltage | Operates down to 2.7 V, supporting single-cell Li-ion batteries throughout full discharge curve without brownout. |
Applications
| Laptop DC-DC Power Supply | Dual-Output Flyback Converter |
|---|---|
Use Scenario: Generating isolated +12V and –5V rails from a 5V USB-C PD source in ultraportable notebooks. IC Role / Device Role / Timing Role: LT1371HVISW#TRPBF operates in flyback configuration with primary-side regulation, using FB for +12V and NFB for –5V sensing. Use Value: Eliminates need for secondary-side optocouplers or TL431 circuits, reducing BOM count by 3–4 components and improving cross-regulation accuracy to ±3%. |
Use Scenario: Providing tightly regulated ±15V analog supply for precision instrumentation amplifiers in medical data acquisition modules. IC Role / Device Role / Timing Role: LT1371HVISW#TRPBF configured in inverting topology for –15V, paired with boost stage for +15V; both regulated via shared VC loop. Use Value: Achieves <15 mV output ripple (20 MHz BW) and <50 µs load transient recovery due to current-mode control and nonlinear gm compensation. |
| Inverting Polarity Supply | Industrial Sensor Interface Power |
Use Scenario: Generating –3.3V rail from 3.3V system bus for RS-485 transceivers requiring true bipolar signaling. IC Role / Device Role / Timing Role: LT1371HVISW#TRPBF in inverting configuration with NFB feedback; VIN = 3.3V, VOUT = –3.3V. Use Value: Delivers 300 mA continuous output with <0.5% line regulation across 3.0–3.6V input range, avoiding discrete charge-pump limitations on current and noise. |
Use Scenario: Powering MEMS pressure sensors and 24-bit ADCs in factory automation nodes where EMI immunity and long-term stability are critical. IC Role / Device Role / Timing Role: LT1371HVISW#TRPBF in boost mode (3.6V → 5.0V) with SYNC locked to MCU timer to avoid spectral overlap with sensitive analog bands. Use Value: Reduces conducted EMI peaks by 12 dB at 700 kHz via synchronized switching, meeting CISPR-22 Class B limits without added ferrite beads. |
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 | 42V input rating, 2.5A switch, 2.2MHz switching, integrated Schottky; no NFB pin or negative regulation support. | Suitable for higher-input industrial supplies but cannot replace LT1371HVISW#TRPBF in dual-polarity or low-VIN (<3V) designs. | Select when input voltage exceeds 25V or board space demands higher frequency/compact magnetics; avoid when NFB functionality is required. |
| TPS55340RTER | 3.5A switch, 1.5MHz, 2.9–32V input, no dual-reference architecture; FB only, no NFB pin or negative output capability. | Offers higher efficiency at light loads via DCM mode but lacks native inverting/flyback flexibility and dual-rail regulation. | Prefer for single-rail boost/buck-boost where 500kHz is insufficient and negative output is unnecessary; not drop-in for NFB-based designs. |
Compared with LT3573EFE#TRPBF and TPS55340RTER, the LT1371HVISW#TRPBF uniquely supports true dual-polarity regulation from one IC, operates down to 2.7V, and retains legacy 500kHz magnetics compatibility - making it irreplaceable in cost-sensitive, space-constrained dual-rail applications where negative output is mandatory.
Availability
LT1371HVISW#TRPBF is available at Aetrix Electronics and suitable for laptop power supplies, industrial sensor interfaces, dual-output flyback converters, and inverting polarity supplies requiring stable component supply across extended production lifecycles.
Supply support for LT1371HVISW#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 aerospace, industrial, automotive, and communications markets.
The LT1371 family was developed specifically for high-efficiency, multi-topology DC-DC conversion in portable and space-constrained systems - emphasizing low quiescent current, dual-rail capability, and robust thermal performance in surface-mount packages.
FAQ
What is the maximum output current achievable with the LT1371HVISW#TRPBF in a 5V-to-12V boost configuration?
The LT1371HVISW#TRPBF supports up to 0.8A continuous output in a 5V-to-12V boost application using a 4.7µH inductor and standard PCB layout, limited by its 3A switch current and thermal constraints (θJA = 50°C/W). Peak inductor current reaches ~2.2A at full load; exceeding this risks saturation or thermal shutdown. Derating to 0.6A ensures reliable operation across –40°C to 85°C ambient.
Can the LT1371HVISW#TRPBF regulate both positive and negative outputs simultaneously in one circuit?
Yes - the LT1371HVISW#TRPBF can regulate both polarities simultaneously using its FB and NFB pins, as demonstrated in the "Dual Output Flyback Converter with Overvoltage Protection" reference design. When both pins are active, the IC prevents either rail from exceeding its setpoint; however, FB pin loading must remain ≤250 µA to maintain accuracy, requiring careful resistor divider sizing.
What is the purpose of the VC pin on the LT1371HVISW#TRPBF, and how is it used in practice?
The VC pin on the LT1371HVISW#TRPBF serves three critical functions: (1) error amplifier output for loop compensation (via RC network), (2) soft-start control point (capacitor coupling enables controlled ramp-up), and (3) current limit adjustment interface (voltage clamping reduces switch current). In normal operation, VC sits between 1.0V (light load) and 1.9V (heavy load), directly reflecting regulation error.
Does the LT1371HVISW#TRPBF require an external diode, and what specifications must it meet?
Yes - the LT1371HVISW#TRPBF requires an external Schottky diode (e.g., MBRS330T3 or MBR330) in boost/inverting configurations. It must withstand peak reverse voltage equal to the output voltage (e.g., 30V for 12V output), conduct ≥0.8A average forward current, and exhibit ≤0.6V forward drop at rated current to maintain efficiency. Fast recovery and low Qrr are essential to minimize switching losses.
How does the LT1371HVISW#TRPBF handle overload or short-circuit conditions?
The LT1371HVISW#TRPBF employs multiple protection mechanisms: (1) pulse-by-pulse current limiting (3.0A min switch limit), (2) oscillator frequency shifting (5:1 reduction when FB < 0.6V), and (3) thermal shutdown at 150°C junction temperature. During sustained overload, frequency reduction lowers peak switch current and dissipates energy more gradually, preventing immediate failure while maintaining regulation of surviving outputs.
LT1371HVISW#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
LT1371HVISW#TRPBF FAQ
1.How can I place an order for LT1371HVISW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1371HVISW#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 LT1371HVISW#TRPBF reliable?
The price and inventory of LT1371HVISW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1371HVISW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1371HVISW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1371HVISW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1371HVISW#TRPBF?
LT1371HVISW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1371HVISW#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 LT1371HVISW#TRPBF?
For technical support, including LT1371HVISW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1371HVISW#TRPBF requirements.
6.How does Aetrix verify that LT1371HVISW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1371HVISW#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 LT1371HVISW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1371HVISW#TRPBF?
All LT1371HVISW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1371HVISW#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 LT1371HVISW#TRPBF part is unused and in its original packaging.
Return procedure for LT1371HVISW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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