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Analog Devices Inc. LT1373HVCS8#PBF
- Part No.:
- LT1373HVCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1373HVCS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,246
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Product details
Overview
LT1373HVCS8#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode switching regulator IC designed for boost, buck, flyback, inverting, and Cuk topologies. It integrates a 1.5A power switch, 250kHz oscillator, error amplifier, and protection circuitry in an 8-pin SOIC package. Key confirmed parameters: 2.7V minimum input voltage, 42V switch breakdown voltage (HV variant), 1mA quiescent current, ±10V feedback pin transient rating, and –40°C to 125°C industrial operating range.
For engineers reviewing the LT1373HVCS8#PBF datasheet, LT1373HVCS8#PBF pinout, LT1373HVCS8#PBF application, or LT1373HVCS8#PBF equivalent, this page delivers verified functional identity, validated pin roles, real-world efficiency curves at 5V-to-12V boost, confirmed negative output regulation capability via NFB pin, and two rigorously cross-checked alternative parts with documented technical and application differences.
Technical Context
The LT1373HVCS8#PBF implements constant-frequency current-mode control: switch duty cycle is set by comparing sensed switch current against a VC pin–derived threshold. Its adaptive anti-saturation driver minimizes switch turn-off delay and dissipation, while nonlinear error amplifier transconductance (250–600 µmho) reduces output overshoot during startup and overload recovery.
Oscillator frequency shifting (5:1 reduction below 0.6V FB) protects external components under overload; dual feedback architecture supports simultaneous positive (1.245V reference at FB) and negative (–2.45V reference at NFB) output regulation without duplicating amplifiers. Shutdown logic reduces supply current to 12µA typical, and external synchronization operates reliably between 300kHz and 340kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 250kHz typical; enables use of compact 15µH inductors and reduces EMI filtering burden. |
| Input Voltage Range | 2.7V to 25V; supports single-cell Li-ion, 3.3V/5V rails, and wide-input industrial supplies. |
| Switch Breakdown Voltage | 42V (HV variant); allows safe operation with 36V nominal input or transient spikes up to 42V. |
| Quiescent Current | 1mA typical; extends battery life in portable boost converters and CCFL backlight drivers. |
| Output Switch Current Limit | 1.5A typical at 50% duty cycle; sets maximum deliverable power before foldback or shutdown. |
| Reference Voltage (FB) | 1.245V ±15mV; defines precision output voltage setting point for positive-regulated supplies. |
| Negative Reference (NFB) | –2.45V ±60mV; enables direct regulation of negative outputs without external op-amps. |
| Shutdown Supply Current | 12µA typical; meets ultra-low-power standby requirements in laptop and embedded systems. |
Pinout & Package
LT1373HVCS8#PBF is housed in an 8-lead plastic SOIC (S8) package with θJA = 120°C/W, rated for 125°C maximum junction temperature. Pin 6 (GND S) provides clean reference ground for internal amplifiers; Pin 7 (GND) carries high-switching-current return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation / Current Limit / Soft-Start Node | Error amplifier output; RC network here sets loop stability, current limit threshold, and soft-start ramp rate. |
| FB (Pin 2) | Positive Output Feedback Input | Inverting input of main error amp; referenced to 1.245V internal bandgap; sets VOUT = 1.245 × (1 + R1/R2). |
| NFB (Pin 3) | Negative Output Feedback Input | Connects to inverting input of dedicated negative-feedback amp via 400kΩ internal resistor; regulates at –2.45V. |
| S/S (Pin 4) | Shutdown & Synchronization Input | Logic-level compatible; <0.6V activates 12µA shutdown; 300–340kHz AC signal synchronizes switching. |
| VIN (Pin 5) | Main Power Input | Supplies internal 2.3V LDO; undervoltage lockout engages below ~2.5V to prevent erratic operation. |
| GND S (Pin 6) | Clean Signal Ground Reference | Reference node for FB, NFB, and error amplifier; must be isolated from high-current GND paths. |
| GND (Pin 7) | Power Switch Emitter Return | High di/dt return path for 1.5A switch; requires low-inductance connection to PCB ground plane. |
| VSW (Pin 8) | Switch Collector Output | Drives external inductor/diode; high dv/dt node requiring shortest possible trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Current-Mode Control Architecture | Enables immediate line transient response, simplified loop compensation, and inherent pulse-by-pulse overcurrent protection. |
| Adaptive Anti-Saturation Driver | Dynamically adjusts base drive to minimize switch saturation voltage and reduce turn-off delay under varying load conditions. |
| Nonlinear Error Amplifier Transconductance | Transconductance increases 10× when FB exceeds reference by 40mV, suppressing output overshoot during startup and recovery. |
| Dual Feedback Capability (FB + NFB) | Single IC regulates both positive and negative outputs simultaneously-e.g., ±15V flyback supplies-without external amplifiers. |
| Oscillator Frequency Shifting | Reduces switching frequency 5:1 when FB drops below 0.6V, lowering peak switch current and protecting components during overload. |
| External Synchronization Support | Accepts 300–340kHz logic-level sync signal on S/S pin, enabling noise-sensitive systems to avoid EMI bands. |
Applications
| Laptop Computer Supplies | CCFL Backlight Drivers |
|---|---|
Use Scenario: Generating 12V–24V from 3.3V/5V system rails to power LCD panel inverters in ultraportable notebooks. IC Role / Device Role / Timing Role: Boost regulator controlling high-efficiency DC-DC conversion; 250kHz switching enables small magnetics and low-profile layout. Use Value: 1mA quiescent current extends battery runtime; 42V HV rating accommodates input surges and ensures reliability across diverse OEM platforms. | Use Scenario: Driving cold-cathode fluorescent lamps in medical displays and industrial HMIs requiring stable, dimmable high-voltage AC. IC Role / Device Role / Timing Role: High-voltage boost controller regulating lamp current via feedback from current-sense transformer secondary. Use Value: Oscillator frequency shifting prevents component overstress during lamp ignition arcs; NFB pin enables auxiliary negative bias generation for gate drive circuits. |
| Multiple Output Flyback Supplies | Inverting Supplies |
Use Scenario: Providing isolated ±15V outputs for op-amp biasing and ADC reference in data acquisition modules. IC Role / Device Role / Timing Role: Flyback controller using dual feedback (FB for +15V, NFB for –15V) to maintain tight cross-regulation without optocouplers. Use Value: Simultaneous regulation eliminates need for post-regulators; 1.5A switch supports >1W total output power with <±3% load regulation. | Use Scenario: Generating –5V from 5V USB power for RS-232 level shifters and analog sensor biasing in IoT edge nodes. IC Role / Device Role / Timing Role: Inverting topology regulator using NFB pin as primary feedback node; no external inverting op-amp required. Use Value: Direct –2.45V reference enables precise –5V output with only two resistors; 2.7V minimum input allows operation from single Li-ion cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872EMS#TRPBF | Fixed 500kHz frequency, no NFB pin, requires external MOSFET, higher IQ (2.5mA) | Optimized for high-density synchronous buck; lacks native negative output support | Select when board space is critical and only positive outputs are needed; not suitable for inverting or dual-polarity designs. |
| LM5122MMX/NOPB | Adjustable 50kHz–750kHz frequency, integrated high-side MOSFET driver, no HV rating (36V max) | Targets automotive and industrial buck-boost; lacks built-in negative feedback reference | Choose for designs requiring programmable frequency and external FET control; avoid where 42V switch rating or –2.45V NFB reference is mandatory. |
Compared with LTC3872EMS#TRPBF and LM5122MMX/NOPB, the LT1373HVCS8#PBF uniquely combines 42V switch rating, integrated 1.5A switch, dual FB/NFB architecture, and 1mA quiescent current-making it irreplaceable for compact, low-power, dual-polarity or high-input-voltage boost/flyback designs where external components must be minimized.
Availability
LT1373HVCS8#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, multiple-output flyback converters, and inverting power supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1373HVCS8#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 legacy Linear parts including the LT1373 family.
The LT1373HVCS8#PBF belongs to Linear's high-efficiency, low-quiescent-current switching regulator product line, engineered specifically for space-constrained, battery-sensitive, and multi-rail power applications in portable computing and industrial instrumentation.
FAQ
What is the maximum input voltage rating for the LT1373HVCS8#PBF?
The LT1373HVCS8#PBF has a 42V switch breakdown voltage rating, confirmed in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1373 (35V), enabling reliable operation with 36V nominal inputs or transient spikes up to 42V. The VIN pin itself is rated to 30V, so external clamping or regulation may be required if input exceeds that value while maintaining switch safety.
Can the LT1373HVCS8#PBF regulate negative output voltages without external op-amps?
Yes. The LT1373HVCS8#PBF includes a dedicated negative feedback amplifier with a –2.45V internal reference accessible via the NFB pin. When configured with an appropriate resistor divider, it directly regulates negative outputs-e.g., –5V or –15V-without external op-amps or level-shifting circuitry. The FB pin remains unused in pure negative-output configurations.
How does the LT1373HVCS8#PBF achieve low quiescent current while maintaining 250kHz operation?
The LT1373HVCS8#PBF achieves 1mA typical quiescent current through optimized internal biasing and a low-dropout 2.3V regulator powering all control circuitry. Unlike higher-frequency alternatives (e.g., 500kHz LT1372 drawing 4mA), its 250kHz oscillator and current-mode architecture reduce switching losses and enable efficient light-load operation-critical for battery-powered boost and CCFL applications.
What is the function of the VC pin on the LT1373HVCS8#PBF, and how is it used in design?
The VC pin on the LT1373HVCS8#PBF serves three critical functions: it is the error amplifier output (for loop compensation), the current limit threshold input (via external clamp), and the soft-start control node (via capacitor coupling). A series RC network from VC to ground sets loop stability; clamping VC below 0.8V forces zero duty cycle for idle mode; and a capacitor from VC to ground provides controlled startup ramp.
Does the LT1373HVCS8#PBF support external synchronization, and what is its valid frequency range?
Yes, the LT1373HVCS8#PBF supports external synchronization via the S/S pin. The guaranteed synchronization range is 300kHz to 340kHz-corresponding to 1.05× to 1.36× its natural 250kHz frequency. Operation above 330kHz requires caution due to reduced slope compensation amplitude, which may cause subharmonic oscillation at >50% duty cycle; designers should verify stability with higher inductance values if syncing near 340kHz.
LT1373HVCS8#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1373HVCS8#PBF FAQ
1.How can I place an order for LT1373HVCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1373HVCS8#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 LT1373HVCS8#PBF reliable?
The price and inventory of LT1373HVCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1373HVCS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1373HVCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1373HVCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1373HVCS8#PBF?
LT1373HVCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1373HVCS8#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 LT1373HVCS8#PBF?
For technical support, including LT1373HVCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1373HVCS8#PBF requirements.
6.How does Aetrix verify that LT1373HVCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1373HVCS8#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 LT1373HVCS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1373HVCS8#PBF?
All LT1373HVCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1373HVCS8#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 LT1373HVCS8#PBF part is unused and in its original packaging.
Return procedure for LT1373HVCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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