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Analog Devices Inc. LT1372HVIN8#PBF
- Part No.:
- LT1372HVIN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1372HVIN8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
LT1372HVIN8#PBF from Analog Devices (formerly Linear Technology) is a monolithic 500kHz current-mode switching regulator IC in 8-pin PDIP package, featuring a 1.5A integrated power switch, 2.7V minimum input voltage, ±10V feedback pin transient tolerance, and support for boost/buck/flyback/inverting topologies. It regulates positive or negative outputs and targets laptop computer supplies and CCFL backlight drivers.
For engineers reviewing the LT1372HVIN8#PBF datasheet, LT1372HVIN8#PBF pinout, LT1372HVIN8#PBF application, or LT1372HVIN8#PBF equivalent, key selection considerations include its 42V HV-rated switch breakdown voltage, 12µA shutdown current, nonlinear error amplifier transconductance for reduced startup overshoot, and dual feedback architecture enabling simultaneous positive/negative output regulation.
Technical Context
The LT1372HVIN8#PBF implements current-mode control with pulse-by-pulse switch current limiting and adaptive anti-saturation driver logic. Its oscillator operates at 500kHz (±50kHz over temperature), and internal 2.3V low-dropout regulator powers all circuitry independently of input voltage variation between 2.7V and 25V.
It integrates dual error amplifiers: one referenced to +1.245V for positive output sensing at FB pin, and another referenced to –2.49V for negative output sensing at NFB pin, both sharing the same VC compensation node. Frequency shifting (5:1 reduction when FB < 0.6V) provides overload protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz typical; enables use of compact 4.7µH inductors and reduces board area vs lower-frequency regulators. |
| Integrated Switch Rating | 42V breakdown voltage (HV variant); supports higher input rails than standard LT1372 (35V), e.g., 36V industrial inputs. |
| Output Switch Current Limit | 1.5A typical; sets maximum peak inductor current, defining max continuous output current in boost configuration. |
| Reference Voltage | +1.245V at FB pin; defines output voltage via resistor divider (e.g., 12V output = 1.245V × (1 + R1/R2)). |
| Shutdown Supply Current | 12µA typical; enables ultra-low-power standby in battery-powered systems like laptops. |
| Minimum Input Voltage | 2.7V; allows operation directly from single Li-ion cells or 3.3V system rails with margin. |
| Error Amplifier Transconductance | 1500µmho typical; determines loop gain and stability; nonlinear behavior reduces output overshoot during load transients. |
Pinout & Package
LT1372HVIN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300" wide body, JEDEC MS-001 compliant, thermal resistance θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation / Error Amplifier Output | External RC network sets loop stability; clamping controls soft-start and current limit; voltage range 0.8–1.9V reflects load condition. |
| FB (Pin 2) | Positive Feedback Input | Connects to resistor divider for +VOUT regulation; 1.245V reference enables precise output setting; 250nA bias current minimizes divider error. |
| NFB (Pin 3) | Negative Feedback Input | Connects to resistor divider for –VOUT regulation; –2.49V reference enables direct negative output control without external op-amps. |
| S/S (Pin 4) | Shutdown / Synchronization | Logic-low (<1.3V) enables 12µA shutdown; externally driven 600–800kHz signal synchronizes switching to reduce EMI in multi-rail systems. |
| VIN (Pin 5) | Input Supply | Bypass with ≥10µF capacitor; undervoltage lockout activates below 2.5V to prevent erratic operation during brownout. |
| GND S (Pin 6) | Ground Sense | Reference ground for internal bandgap, error amps, and NFB amplifier; must be connected to quiet ground point near feedback divider. |
| GND (Pin 7) | Power Ground | Emitter return path for 1.5A switch; requires low-impedance connection to main ground plane to minimize noise coupling. |
| VSW (Pin 8) | Switch Node | Collector of internal NPN switch; carries high di/dt current; trace must be short and direct to diode/inductor to limit EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Switch | 42V breakdown rating enables reliable operation with 36V input rails and transient margins in industrial applications. |
| Dual-Polarity Regulation | Single IC regulates both +VOUT (via FB) and –VOUT (via NFB) without external amplifiers, reducing component count in dual-rail supplies. |
| Nonlinear Transconductance | Error amplifier gm increases 10× when FB exceeds VREF by 40mV, actively suppressing output overshoot during startup or recovery from overload. |
| Frequency Shifting Protection | Oscillator slows 5:1 when FB < 0.6V, lowering switch duty cycle and peak current to protect external components during sustained overload. |
| Low Quiescent Current | 4mA typical operating supply current extends battery life in portable equipment such as laptop auxiliary rails. |
Applications
| Laptop Computer Power Rails | CCFL Backlight Driver |
|---|---|
Use Scenario: Generating isolated 12V/–12V rails from 5V motherboard supply for LCD panel interface and analog circuitry. IC Role / Device Role / Timing Role: Configured in flyback topology with dual feedback (FB + NFB), LT1372HVIN8#PBF regulates both polarities simultaneously while maintaining tight cross-regulation. Use Value: Eliminates need for separate positive and negative regulators, reducing BOM cost and PCB area by >30% versus discrete solutions. |
Use Scenario: Driving cold cathode fluorescent lamp (CCFL) with regulated high-voltage AC output using resonant inverter stage. IC Role / Device Role / Timing Role: Operated in boost mode to generate ~300V DC bus; S/S pin synchronized to display frame rate to suppress visible flicker. Use Value: 500kHz switching enables compact magnetics; frequency shifting prevents lamp strike failure during dimming transitions. |
| Inverting DC-DC Converter | Multiple-Output Flyback Supply |
Use Scenario: Converting 12V automotive input to –5V rail for sensor biasing in engine control units. IC Role / Device Role / Timing Role: Used in inverting topology with NFB feedback; GND S pin referenced to clean analog ground isolates digital noise from precision bias voltage. Use Value: Direct negative regulation avoids inefficiency and noise of post-regulator inverters; 12µA shutdown supports low-power sleep modes. |
Use Scenario: Providing +15V and –15V isolated outputs from 24V industrial input in programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: Employed in multiple-output flyback with dual feedback (FB for +15V, NFB for –15V); frequency shifting protects secondary rectifiers during output short events. Use Value: Cross-regulation maintained within ±3% across load steps without optocouplers or secondary-side controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1372CN8#PBF | Standard 35V switch breakdown; not rated for >35V input; identical pinout and functionality otherwise. | Suitable only for ≤30V input systems; cannot replace LT1372HVIN8#PBF in 36V industrial or automotive applications. | Select LT1372CN8#PBF only if input voltage remains strictly below 30V and HV margin is unnecessary. |
| LT1377HVCS8#TRPBF | 1MHz switching frequency; SO-8 package; 42V switch rating; 0.35A max output current (vs 0.29A for LT1372HVIN8#PBF in boost). | Better suited for space-constrained designs needing higher frequency; lower output current limits use in high-power boost. | Choose LT1377HVCS8#TRPBF when board area is critical and output current ≤350mA; avoid for >0.3A loads due to derated switch current. |
Compared with LT1372CN8#PBF, LT1372HVIN8#PBF adds 7V headroom for robustness against transients; compared with LT1377HVCS8#TRPBF, it trades higher frequency for greater output current capability and through-hole manufacturability.
Availability
LT1372HVIN8#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, and inverting DC-DC converters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1372HVIN8#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 and manufacturing continuity for legacy Linear products including the LT1372 family.
The LT1372 series was designed as a high-efficiency, high-voltage monolithic switching regulator targeting portable and industrial power conversion where board space, thermal performance, and dual-polarity capability are critical.
FAQ
What is the maximum input voltage rating for LT1372HVIN8#PBF?
The LT1372HVIN8#PBF has a 42V absolute maximum switch breakdown voltage, enabling reliable operation with input voltages up to 36V in industrial and automotive environments. This is 7V higher than the standard LT1372 (35V), providing critical margin against line transients. The supply voltage (VIN pin) is rated to 30V per Absolute Maximum Ratings table.
Can LT1372HVIN8#PBF regulate both positive and negative outputs simultaneously?
Yes, the LT1372HVIN8#PBF supports simultaneous regulation of positive and negative outputs using its dual feedback architecture: FB pin for +VOUT (referenced to +1.245V) and NFB pin for –VOUT (referenced to –2.49V). When both pins are used, the IC prevents either output from exceeding its setpoint, enabling cross-regulated dual-rail supplies without optocouplers or secondary controllers.
What is the purpose of the VC pin on LT1372HVIN8#PBF?
VC (Pin 1) on the LT1372HVIN8#PBF serves three critical functions: it is the output of the error amplifier for loop compensation, the input to the current comparator for duty-cycle control, and the node for soft-start and current-limit adjustment. An external RC network from VC to ground sets loop stability; clamping VC below 0.8V forces zero duty cycle for idle mode.
How does LT1372HVIN8#PBF handle overload conditions?
The LT1372HVIN8#PBF employs two overload protections: pulse-by-pulse current limiting (1.5A typical switch limit) and oscillator frequency shifting. When FB voltage drops below 0.6V, the 500kHz oscillator slows to 100kHz (5:1 reduction), lowering peak switch current and dissipating less power in external components-preventing thermal runaway without external circuitry.
Is LT1372HVIN8#PBF pin-compatible with other LT1372 variants?
Yes, LT1372HVIN8#PBF shares identical 8-pin PDIP (N8) pinout and electrical compatibility with all LT1372 variants including LT1372CN8#PBF and LT1372IN8#PBF. Differences are limited to voltage ratings (HV vs standard), temperature grade (commercial vs industrial), and package type (PDIP vs SO-8), allowing drop-in replacement where voltage and thermal requirements align.
LT1372HVIN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1372HVIN8#PBF FAQ
1.How can I place an order for LT1372HVIN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1372HVIN8#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 LT1372HVIN8#PBF reliable?
The price and inventory of LT1372HVIN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1372HVIN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1372HVIN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1372HVIN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1372HVIN8#PBF?
LT1372HVIN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1372HVIN8#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 LT1372HVIN8#PBF?
For technical support, including LT1372HVIN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1372HVIN8#PBF requirements.
6.How does Aetrix verify that LT1372HVIN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1372HVIN8#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 LT1372HVIN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1372HVIN8#PBF?
All LT1372HVIN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1372HVIN8#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 LT1372HVIN8#PBF part is unused and in its original packaging.
Return procedure for LT1372HVIN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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