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Analog Devices Inc. LT1372HVIS8#PBF
- Part No.:
- LT1372HVIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1372HVIS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:183
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Product details
Overview
LT1372HVIS8#PBF from Analog Devices (formerly Linear Technology) is a monolithic 500kHz current-mode switching regulator IC in an 8-pin SOIC package, integrating a 1.5A power switch, oscillator, error amplifier, and protection circuitry. It supports boost, buck, flyback, inverting, and Cuk topologies, regulates both positive and negative outputs, and operates down to 2.7V input voltage - ideal for compact laptop power supplies and dual-output flyback converters.
For engineers reviewing the LT1372HVIS8#PBF datasheet, LT1372HVIS8#PBF pinout, LT1372HVIS8#PBF application, or LT1372HVIS8#PBF equivalent, key selection factors include its 500kHz fixed switching frequency, ±2.49V dual-reference architecture (FB/NFB), 12µA shutdown current, 42V switch breakdown rating (HV variant), and compatibility with small 4.7µH inductors in space-constrained designs.
Technical Context
The LT1372HVIS8#PBF implements peak-current-mode control with adaptive anti-saturation driver logic, enabling immediate line transient response and simplified loop compensation. Its error amplifier features nonlinear transconductance (700–2300 µmho) that increases tenfold above 40mV FB overvoltage to suppress startup overshoot.
It integrates dual feedback paths: FB pin references +1.245V for positive output regulation, while NFB pin references –2.49V for negative output sensing via a 100kΩ internal source resistor. The VC pin serves simultaneously as error amplifier output, soft-start node, and current-limit adjustment point - all functions validated for the LT1372HV family across industrial temperature range (–40°C to 125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz typical - enables use of compact 4.7 µH inductors and reduces EMI filter size |
| Input Voltage Range | 2.7 V to 25 V - supports single-cell Li-ion up to 24 V industrial rails without external LDO |
| Switch Breakdown Voltage | 42 V - HV variant withstands 36 V nominal input surges common in automotive/industrial systems |
| Output Switch Current Limit | 1.5 A typical - sets maximum deliverable load current in boost/buck configurations |
| Reference Voltage (FB) | +1.245 V ±15 mV - precision bandgap reference enabling accurate output setting with standard resistor dividers |
| Reference Voltage (NFB) | –2.490 V ±50 mV - allows direct negative output regulation without external op-amps or level shifters |
| Quiescent Current | 4 mA typical - minimizes no-load power loss in battery-powered applications |
| Shutdown Current | 12 µA typical - extends battery life during system sleep modes |
Pinout & Package
LT1372HVIS8#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad thermal enhancement, rated for θJA = 120°C/W and operating junction temperature up to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Accepts RC network for loop stability; clamping controls soft-start and current limit |
| FB (Pin 2) | Positive output voltage sense input | Connects to resistor divider for +VOUT regulation; 250 nA bias current affects high-R dividers |
| NFB (Pin 3) | Negative output voltage sense input | References –2.49 V; –30 µA bias current requires compensation in R-divider design |
| S/S (Pin 4) | Shutdown & synchronization input | Logic-low (<1.3 V) enables 12 µA shutdown; 600–800 kHz square wave synchronizes switching |
| VIN (Pin 5) | Power input supply | Bypass with ≥10 µF capacitor; triggers undervoltage lockout below 2.5 V |
| GND S (Pin 6) | Clean analog ground reference | Reference point for internal bandgap, error amp, and NFB amplifier - isolate from power ground currents |
| GND (Pin 7) | Power switch emitter return | Carries high pulsed switch current - connect directly to low-impedance ground plane |
| VSW (Pin 8) | Power switch collector output | Drives external inductor/diode; trace length must be minimized to reduce EMI and voltage spikes |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reference regulation | Simultaneous +1.245 V (FB) and –2.49 V (NFB) references enable single-IC dual-polarity output control without external amplifiers |
| Current-mode control | Peak-current sensing provides inherent cycle-by-cycle overcurrent protection and eliminates need for slope compensation in most designs |
| Nonlinear error amplifier transconductance | Transconductance jumps 10× above 40 mV FB overvoltage - actively suppresses output overshoot during startup and load recovery |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB < 0.6 V - maintains control under overload by extending minimum duty cycle |
| Adaptive anti-saturation driver | Dynamically adjusts base drive to minimize switch saturation voltage and optimize turn-off speed at varying loads |
| Low minimum input voltage | 2.7 V operation supports single-cell Li-ion (2.8–4.2 V) and 3.3 V system rails without pre-regulation |
Applications
| Laptop Computer Power Supply | CCFL Backlight Driver |
|---|---|
Use Scenario: Generating isolated 12 V and –5 V rails from a 5 V USB-C or battery source in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary controller in non-isolated boost configuration regulating +12 V, while NFB pin regulates –5 V via coupled inductor winding. Use Value: Eliminates need for separate negative charge pump or inverting converter IC, reducing BOM count and PCB area by >30%. | Use Scenario: Driving cold cathode fluorescent lamp (CCFL) strings requiring high-voltage AC (600–1000 VAC) from low-voltage DC input. IC Role / Device Role / Timing Role: Controls resonant flyback topology where VSW drives primary side; FB monitors rectified lamp current for constant-current regulation. Use Value: Built-in 42 V switch rating and 500 kHz frequency allow direct drive of small ferrite transformers - avoids external MOSFET and gate driver. |
| Multiple Output Flyback Supply | Inverting DC-DC Converter |
Use Scenario: Providing regulated +5 V and –12 V outputs for analog sensor front-ends in industrial data acquisition modules. IC Role / Device Role / Timing Role: Dual-feedback controller using both FB and NFB pins to independently regulate two isolated secondaries in flyback transformer. Use Value: Prevents unregulated overvoltage on lightly loaded outputs - ensures safe operation across full load range without auxiliary winding or optocoupler feedback. | Use Scenario: Converting +3.3 V system rail to –3.3 V for RS-232 transceivers or op-amp biasing in embedded controllers. IC Role / Device Role / Timing Role: Inverting topology controller where VSW drives inductor to GND, and output is taken from inductor-to-diode node referenced to VIN. Use Value: Achieves –3.3 V at 200 mA with <1% line/load regulation using only one inductor and diode - no transformer or charge pump required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872-1ES6#TRMPBF | Fixed 500 kHz frequency, but uses external MOSFETs; no integrated 1.5 A switch | Requires external high-side FET and driver - suitable for higher-current (>3 A) or higher-efficiency designs | Select when >1.5 A output current or >95% efficiency at 12 V out is required; not drop-in compatible |
| TPS61088RHLR | 500 kHz synchronous boost with integrated 10 A switch; 2.7–12 V input; no NFB pin or negative output support | Optimized for single-output boost only; lacks dual-reference capability for inverting/flyback topologies | Choose for high-current boost-only applications where footprint and efficiency outweigh multi-topology flexibility |
Compared with LTC3872-1ES6#TRMPBF and TPS61088RHLR, the LT1372HVIS8#PBF uniquely combines integrated 1.5 A switch, dual-reference feedback (FB/NFB), and 42 V HV rating in an 8-pin SOIC - making it the only option among the three capable of direct negative output regulation and flyback control without external components.
Availability
LT1372HVIS8#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, multiple-output flyback supplies, and inverting DC-DC converters requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1372HVIS8#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 technical support and manufacturing continuity for legacy Linear products including the LT1372 series.
The LT1372 product line was designed specifically for compact, high-efficiency DC-DC conversion in portable and space-constrained industrial systems - emphasizing multi-topology flexibility, dual-polarity regulation, and robust HV operation without external switches.
FAQ
What is the maximum input voltage rating for LT1372HVIS8#PBF?
The LT1372HVIS8#PBF has a maximum switch breakdown voltage of 42 V, confirmed in the Absolute Maximum Ratings table for the HV variant. This exceeds the standard LT1372 (35 V) and enables reliable operation with 36 V nominal input rails subject to transient surges - a key differentiator validated across all LT1372HV part numbers including LT1372HVIS8#PBF.
Can LT1372HVIS8#PBF regulate negative output voltages without external op-amps?
Yes. The LT1372HVIS8#PBF includes a dedicated NFB pin referencing –2.49 V, allowing direct negative output regulation using only a resistor divider. This architecture is explicitly documented in the "Negative Output Voltage Setting" section and verified for LT1372HV variants - eliminating need for external amplifiers or level shifters in inverting or dual-output flyback designs.
What is the guaranteed switching frequency tolerance for LT1372HVIS8#PBF over temperature?
The LT1372HVIS8#PBF guarantees a switching frequency of 430 kHz to 580 kHz over the full industrial temperature range (–40°C to 125°C), as specified in the Electrical Characteristics table under "f Switching Frequency" for LT1372 grade. This 500 kHz nominal frequency remains stable enough to enable predictable EMI filtering and inductor selection across operating conditions.
Does LT1372HVIS8#PBF support external synchronization, and what is the valid frequency range?
Yes. The S/S pin of LT1372HVIS8#PBF accepts external TTL/CMOS square waves for synchronization. The guaranteed range is 600 kHz to 800 kHz, as stated in the Electrical Characteristics table. Operation outside this range may cause erratic behavior - especially above 700 kHz where internal slope compensation amplitude decreases, risking subharmonic oscillation at >50% duty cycle.
How does the VC pin function in LT1372HVIS8#PBF beyond compensation?
The VC pin in LT1372HVIS8#PBF serves three validated roles: (1) error amplifier output for loop compensation, (2) soft-start node (capacitor coupling enables controlled ramp-up), and (3) current limit adjustment point (external clamp lowers effective trip threshold). All three functions are explicitly described in the "Pin Functions" section and confirmed for the LT1372HV family, including LT1372HVIS8#PBF.
LT1372HVIS8#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:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1372HVIS8#PBF FAQ
1.How can I place an order for LT1372HVIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1372HVIS8#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 LT1372HVIS8#PBF reliable?
The price and inventory of LT1372HVIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1372HVIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1372HVIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1372HVIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1372HVIS8#PBF?
LT1372HVIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1372HVIS8#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 LT1372HVIS8#PBF?
For technical support, including LT1372HVIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1372HVIS8#PBF requirements.
6.How does Aetrix verify that LT1372HVIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1372HVIS8#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 LT1372HVIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1372HVIS8#PBF?
All LT1372HVIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1372HVIS8#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 LT1372HVIS8#PBF part is unused and in its original packaging.
Return procedure for LT1372HVIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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