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Analog Devices Inc. LT1373HVIS8#PBF
- Part No.:
- LT1373HVIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1373HVIS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,310
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Product details
Overview
LT1373HVIS8#PBF from Analog Devices (formerly Linear Technology) is a 250kHz current-mode switching regulator IC with integrated 1.5A power switch, designed for boost, buck, flyback, inverting, and Cuk topologies. It delivers up to 1.5A switch current, operates down to 2.7V input, regulates both positive and negative outputs, and achieves >90% efficiency at 5V-to-12V boost conversion - ideal for laptop supplies and CCFL backlight drivers.
For engineers reviewing the LT1373HVIS8#PBF datasheet, LT1373HVIS8#PBF pinout, LT1373HVIS8#PBF application, or LT1373HVIS8#PBF equivalent, key selection considerations include its 250kHz fixed-frequency operation, 12µA shutdown current, ±2.45V dual-reference architecture, 8-pin SOIC package, and compatibility with small 15µH inductors and surface-mount layouts under 0.6 in².
Technical Context
The LT1373HVIS8#PBF implements constant-frequency current-mode control with internal 250kHz oscillator, nonlinear error amplifier transconductance (250–600 µmho), and adaptive anti-saturation driver logic. Its dual feedback architecture supports independent regulation of positive (1.245V reference at FB) and negative (–2.45V reference at NFB) outputs using shared error amplifier circuitry.
It features logic-compatible shutdown/synchronization (S/S) pin with 1.3V threshold, VC pin for compensation/soft-start/current limit adjustment, and thermal protection via 125°C junction limit. The HV variant (denoted by "HV" in part number) supports 42V switch breakdown voltage, enabling robust operation in higher-input industrial and automotive-derived supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 250 kHz typical; enables use of compact 15–22 µH inductors and reduces EMI filtering burden. |
| Supply Current (IQ) | 1 mA typical at 250 kHz; minimizes no-load power loss in battery-powered systems. |
| Shutdown Current | 12 µA typical; extends battery life during system sleep modes. |
| Switch Current Limit | 1.5 A minimum; defines maximum deliverable output power in boost/flyback configurations. |
| Input Voltage Range | 2.7 V to 25 V; supports single-cell Li-ion (2.7V cutoff) through multi-cell battery and 24V industrial rails. |
| Output Switch BV | 42 V (HV version); allows safe operation with 36V transient surges in automotive or industrial environments. |
| Reference Voltages | +1.245 V (FB), –2.45 V (NFB); enables precise dual-polarity regulation without external references. |
| Package | 8-lead SOIC (S8); surface-mount compatible with standard reflow profiles and 120°C/W thermal resistance. |
Pinout & Package
LT1373HVIS8#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad not present; θJA = 120°C/W. Pin functions are validated per Linear Technology's official LT1373 datasheet Rev. D (2002).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation / Error Amplifier Output | Interface for RC frequency compensation network; also controls soft-start and current limit via external clamping. |
| FB (Pin 2) | Positive Feedback Input | Inverting input of main error amplifier; referenced to +1.245 V internal bandgap for positive output regulation. |
| NFB (Pin 3) | Negative Feedback Input | Connects to –2.45 V reference via 400 kΩ internal resistor; enables direct negative output sensing without external op-amp. |
| S/S (Pin 4) | Shutdown / Synchronization | Logic-level input: low = shutdown (12 µA IQ); 300–340 kHz AC signal = synchronization source. |
| VIN (Pin 5) | Power Input | Main supply input (2.7–25 V); requires ≥10 µF local bypass; triggers undervoltage lockout below 2.5 V. |
| GND S (Pin 6) | Ground Sense | "Clean" reference ground for internal analog blocks (reference, error amp, NFB amp); must be routed separately from high-current GND. |
| GND (Pin 7) | Power Ground | Emiter connection of internal NPN switch; carries full switch current; requires low-inductance connection to PCB ground plane. |
| VSW (Pin 8) | Switch Collector | Collector node of internal 1.5A NPN switch; high di/dt node requiring shortest possible trace to diode and output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output polarity support | Single IC regulates both +VOUT (via FB) and –VOUT (via NFB) using shared error amplifier and distinct internal references. |
| Nonlinear transconductance | Error amplifier gm increases 10× when FB exceeds VREF by 40 mV, reducing output overshoot during startup and overload recovery. |
| Oscillator frequency shifting | When FB < 0.6 V, switching frequency drops 5:1 (to ~50 kHz) to maintain control during overload and prevent component stress. |
| External synchronization | S/S pin accepts 300–340 kHz logic-level clock, enabling noise-sensitive systems to avoid EMI bands or align multiple converters. |
| Adaptive anti-saturation driver | Monitors switch saturation onset in real time and adjusts drive current to minimize conduction loss and ensure fast turn-off. |
| Low minimum input voltage | Operates down to 2.7 V input while maintaining regulation - critical for single-cell Li-ion and energy-harvesting applications. |
Applications
| Laptop Computer Supplies | CCFL Backlight Drivers |
|---|---|
Use Scenario: Generating regulated 12–24 V from 3.3 V or 5 V system rail to power LCD panel backlights in ultraportable notebooks. IC Role / Device Role / Timing Role: Current-mode boost controller with integrated 1.5 A switch, regulating high-voltage CCFL string current via transformer secondary feedback. Use Value: Enables compact, low-profile design (<0.6 in² board area) with high efficiency (>85% at 30 mA load) and minimal external components. | Use Scenario: Driving cold-cathode fluorescent lamps in industrial displays and medical monitors requiring stable brightness and dimming control. IC Role / Device Role / Timing Role: Inverting or flyback controller regulating negative bias voltage for lamp cathodes while providing overvoltage protection via NFB pin monitoring. Use Value: Dual-reference architecture allows simultaneous regulation of positive logic rail and negative lamp bias, eliminating need for separate regulators. |
| Multiple Output Flyback Supplies | Inverting Supplies |
Use Scenario: Providing isolated +15 V and –15 V outputs from 5–12 V input in data acquisition front-ends and precision instrumentation. IC Role / Device Role / Timing Role: Flyback controller using dual feedback (FB and NFB pins) to regulate both polarities independently, with automatic cross-regulation during load imbalance. Use Value: Prevents unregulated overvoltage on lightly loaded outputs - critical for protecting sensitive ADCs, op-amps, and sensors. | Use Scenario: Generating –5 V from 5 V USB or logic supply for RS-232 interface ICs, op-amp biasing, or sensor signal conditioning. IC Role / Device Role / Timing Role: Inverting topology controller using NFB pin as primary feedback node, with internal –2.45 V reference enabling accurate negative output setting. Use Value: Eliminates external inverting op-amp or charge pump; achieves <1% output error and <10 mV ripple with standard tantalum output capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3803EDD-5#TRMPBF | 500 kHz fixed-frequency, 0.8 A switch, no integrated NFB reference; requires external op-amp for negative outputs. | Higher frequency enables smaller magnetics but lacks native dual-polarity regulation capability. | Choose for space-constrained designs needing >500 kHz operation where only positive output is required. |
| TPS54202DRCT | 2.5 A integrated FET, 500 kHz, 2.9–6.0 V input range only; no negative output support or HV switch rating. | Optimized for low-voltage DC/DC (e.g., USB PD, FPGA core rails); incompatible with 12–24 V inputs or inverting topologies. | Prefer for cost-sensitive, high-efficiency 3.3/5 V point-of-load applications - not suitable as drop-in replacement for LT1373HVIS8#PBF. |
Compared with LTC3803EDD-5#TRMPBF and TPS54202DRCT, the LT1373HVIS8#PBF uniquely combines 42 V HV switch rating, dual-polarity regulation, 250 kHz low-noise switching, and 1.5 A current capability in a single 8-pin SOIC - making it irreplaceable for industrial flyback, laptop boost, and bipolar supply designs requiring robustness and functional integration.
Availability
LT1373HVIS8#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, multiple-output flyback converters, and inverting supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1373HVIS8#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 maintains full product support, documentation, and manufacturing continuity for the LT portfolio.
The LT1373 product line was engineered for high-efficiency, low-quiescent-current DC/DC conversion in portable and industrial systems - emphasizing topology flexibility (boost/buck/flyback/inverting), dual-polarity regulation, and robust HV operation without external high-voltage transistors.
FAQ
What is the maximum input voltage supported by the LT1373HVIS8#PBF?
The LT1373HVIS8#PBF supports a maximum input voltage of 25 V on the VIN pin. Its HV-rated output switch has a guaranteed breakdown voltage of 42 V, allowing safe operation with transient surges up to that level - a key distinction from the standard LT1373 (35 V switch BV). This makes the LT1373HVIS8#PBF suitable for 24 V industrial rails with margin.
Can the LT1373HVIS8#PBF regulate both positive and negative outputs simultaneously?
Yes, the LT1373HVIS8#PBF can regulate both positive and negative outputs simultaneously using its dual feedback architecture: the FB pin (referenced to +1.245 V) controls the positive output, while the NFB pin (referenced to –2.45 V) controls the negative output. In dual-output flyback configurations, the LT1373HVIS8#PBF prevents either output from exceeding its setpoint - a feature confirmed in the "Dual Polarity Output Voltage Sensing" section of the official datasheet.
What is the purpose of the VC pin on the LT1373HVIS8#PBF?
On the LT1373HVIS8#PBF, the VC pin serves three critical functions: (1) it is the output of the error amplifier and provides the control signal for current-mode PWM; (2) it interfaces with an external RC network for loop compensation; and (3) it enables soft-start and adjustable current limiting via external voltage clamping. During normal operation, VC voltage varies between ~1.0 V (light load) and ~1.9 V (heavy load), directly modulating switch duty cycle.
Does the LT1373HVIS8#PBF support external synchronization, and what is its valid frequency range?
Yes, the LT1373HVIS8#PBF supports external synchronization via its S/S pin. The guaranteed synchronization range is 300 kHz to 340 kHz - corresponding to 1.05× to 1.36× its nominal 250 kHz switching frequency. Operation above 330 kHz requires caution due to reduced internal slope compensation, which may cause subharmonic oscillation at duty cycles >50%. The LT1373HVIS8#PBF includes a 12 µs resettable delay to prevent false shutdown during sync pulses.
What package type and thermal characteristics apply to the LT1373HVIS8#PBF?
The LT1373HVIS8#PBF is supplied in an 8-lead plastic SOIC (S8) package with no exposed thermal pad. Its thermal resistance is θJA = 120°C/W under standard JEDEC 2-layer board conditions. The maximum junction temperature is rated at 125°C, and the device incorporates thermal shutdown to protect against sustained overloads. Layout best practices require separating GND S (Pin 6) and GND (Pin 7) return paths to preserve analog accuracy.
LT1373HVIS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 1.5A (Switch)
- Frequency - Switching:
- 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1373HVIS8#PBF FAQ
1.How can I place an order for LT1373HVIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1373HVIS8#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 LT1373HVIS8#PBF reliable?
The price and inventory of LT1373HVIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1373HVIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1373HVIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1373HVIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1373HVIS8#PBF?
LT1373HVIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1373HVIS8#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 LT1373HVIS8#PBF?
For technical support, including LT1373HVIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1373HVIS8#PBF requirements.
6.How does Aetrix verify that LT1373HVIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1373HVIS8#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 LT1373HVIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1373HVIS8#PBF?
All LT1373HVIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1373HVIS8#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 LT1373HVIS8#PBF part is unused and in its original packaging.
Return procedure for LT1373HVIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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