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Analog Devices Inc. LT1372HVCN8#PBF
- Part No.:
- LT1372HVCN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1372HVCN8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,126
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Product details
Overview
LT1372HVCN8#PBF from Analog Devices (formerly Linear Technology) is a high-voltage monolithic 500kHz current-mode switching regulator IC in an 8-pin PDIP package, integrating a 1.5A power switch, oscillator, error amplifier, and protection circuitry. It supports boost, buck, flyback, inverting, and Cuk topologies, operates down to 2.7V input, delivers up to 42V switch voltage rating, and is used in laptop power supplies, CCFL backlight drivers, and multiple-output flyback converters.
For engineers reviewing the LT1372HVCN8#PBF datasheet, LT1372HVCN8#PBF pinout, LT1372HVCN8#PBF application, or LT1372HVCN8#PBF equivalent, key selection considerations include its 42V switch breakdown voltage, 1.245V internal reference, 12µA shutdown current, dual positive/negative output regulation capability, and compatibility with small 4.7µH inductors for compact board space.
Technical Context
The LT1372HVCN8#PBF 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 tenfold above 40mV error to suppress startup/overload overshoot.
It supports dual feedback modes: FB pin regulates positive outputs at 1.245V reference, while NFB pin enables negative output regulation at –2.49V via a dedicated 100kΩ source resistor. The S/S pin provides logic-level shutdown (threshold 0.6–2.0V) and external synchronization (600–800kHz range), with built-in 12µs resettable delay to prevent false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz typical - enables use of compact 4.7µH inductors and reduces filter component size. |
| Switch Breakdown Voltage | 42 V - supports higher input rails and robust operation in industrial/laptop supply applications. |
| Internal Reference Voltage | 1.245 V (FB), –2.49 V (NFB) - enables precise positive or negative output regulation without external references. |
| Supply Current (Quiescent) | 4 mA typical - minimizes no-load power loss in battery-powered systems. |
| Shutdown Supply Current | 12 µA typical - extends battery life during system sleep modes. |
| Output Switch Current Limit | 1.5 A typical - defines maximum sustainable load current before foldback or shutdown. |
| Minimum Input Voltage | 2.7 V - allows operation directly from single-cell Li-ion or two-cell alkaline batteries. |
| Error Amplifier Transconductance | 1100–1900 µmho - determines loop gain and compensation network design for stable regulation. |
Pinout & Package
LT1372HVCN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300″ wide body and through-hole mounting. Thermal resistance θJA = 100°C/W. Pin 6 (GNDS) provides clean reference ground for feedback and error amplifier; Pin 7 (GND) carries high-switching-current return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation / Soft-start / Current limit control | Error amplifier output; RC network here sets loop stability, soft-start time, and current limit threshold. |
| FB (Pin 2) | Positive output voltage sense input | Inverting input of main error amp; referenced to 1.245V internal bandgap; sets output via resistor divider. |
| NFB (Pin 3) | Negative output voltage sense input | Connects to inverting input of negative feedback amp via 100kΩ internal resistor; regulates at –2.49V. |
| S/S (Pin 4) | Shutdown and synchronization input | Logic-compatible pin: low = shutdown (12µA IQ); AC-coupled signal at 600–800kHz synchronizes switching. |
| VIN (Pin 5) | Input supply bypass | Bypass with ≥10µF capacitor; UVLO activates below 2.5V to disable switching and pull VC low. |
| GNDS (Pin 6) | Clean reference ground | Reference node for internal bandgap, error amp, and NFB amp; must be isolated from high-current GND paths. |
| GND (Pin 7) | Power switch emitter return | High di/dt ground return for 1.5A switch; requires direct connection to low-impedance ground plane. |
| VSW (Pin 8) | Power switch collector output | Drives external inductor/diode; high dv/dt node requiring short traces to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage switch rating | 42 V breakdown - enables operation with 36V input rails and improved margin in automotive/industrial environments. |
| Dual polarity regulation | Single IC regulates both +VOUT (via FB) and –VOUT (via NFB) - eliminates need for separate regulators in dual-rail systems. |
| Nonlinear error amplifier | Transconductance jumps 10× when FB error exceeds 40mV - actively suppresses output overshoot during startup and load recovery. |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB < 0.6V - maintains control under overload by extending minimum duty cycle. |
| Adaptive anti-saturation driver | Real-time adjustment of base drive to minimize VCE(sat) and switching losses - improves efficiency and thermal performance. |
| Low minimum supply voltage | 2.7 V operation - supports direct integration into single-cell Li-ion or multi-cell alkaline battery systems. |
Applications
| Laptop Computer Power Supply | CCFL Backlight Driver |
|---|---|
Use Scenario: Step-up DC-DC conversion from 5V or 3.3V system rail to 12V or 19V for motherboard peripherals and display subsystems. IC Role / Device Role / Timing Role: Primary boost controller regulating stable 12V output using current-mode control and integrated 1.5A switch. Use Value: Enables compact, high-efficiency power architecture with minimal external components and <0.5 in² board footprint. |
Use Scenario: High-voltage AC generation (≈600–1000VAC) for cold cathode fluorescent lamp (CCFL) backlighting in LCD panels. IC Role / Device Role / Timing Role: Inverting or flyback controller driving transformer primary; regulated via NFB pin for precise lamp current control. Use Value: Delivers stable lamp brightness with built-in overcurrent protection and soft-start to prevent lamp ignition stress. |
| Multiple-Output Flyback Supply | Inverting DC-DC Converter |
Use Scenario: Isolated dual-output (±12V or +5V/–5V) flyback converter for analog front-end or op-amp biasing in industrial sensors. IC Role / Device Role / Timing Role: Dual-feedback controller using both FB and NFB pins to regulate positive and negative outputs simultaneously. Use Value: Eliminates secondary-side error amplifiers and optocouplers, reducing BOM count and improving cross-regulation accuracy. |
Use Scenario: Generating negative supply rails (e.g., –5V, –12V) from positive input sources in mixed-signal circuits and data acquisition systems. IC Role / Device Role / Timing Role: Inverting topology controller with NFB-based regulation; uses same inductor as boost but reversed polarity. Use Value: Achieves high-efficiency negative voltage generation without external charge pumps or transformers. |
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 | Lower 35V switch breakdown voltage; identical pinout, frequency, and feature set. | Not suitable for >35V input or high-voltage flyback designs requiring 42V margin. | Select LT1372HVCN8#PBF when input voltage may approach or exceed 35V, or when enhanced reliability under voltage transients is required. |
| LT1377HVCN8#PBF | 1MHz switching frequency (vs. 500kHz); otherwise identical HV rating, pinout, and regulation architecture. | Enables smaller magnetics and faster transient response, but increases switching losses at high load currents. | Choose LT1372HVCN8#PBF for lower EMI-sensitive applications or where thermal headroom is constrained; select LT1377HVCN8#PBF for ultra-compact designs prioritizing size over efficiency. |
Compared with LT1372CN8#PBF, LT1372HVCN8#PBF adds 7V switch voltage headroom critical for industrial input surges; versus LT1377HVCN8#PBF, it trades 2× lower switching frequency for reduced gate drive loss and relaxed EMI filtering requirements.
Availability
LT1372HVCN8#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, and multiple-output flyback converters requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1372HVCN8#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 LT1372 family.
The LT1372HVCN8#PBF belongs to Linear's high-voltage monolithic switching regulator product line, designed specifically for compact, efficient DC-DC conversion in portable and industrial power systems where input voltage margin and dual-polarity regulation are critical.
FAQ
What is the maximum input voltage supported by the LT1372HVCN8#PBF?
The LT1372HVCN8#PBF supports a maximum switch voltage of 42 V, allowing reliable operation with input rails up to 36 V after derating. Its absolute maximum supply voltage (VIN) is 30 V, and the S/S pin tolerates up to 30 V. This makes LT1372HVCN8#PBF suitable for industrial and automotive auxiliary power applications where transient voltage margins are essential.
Can the LT1372HVCN8#PBF regulate both positive and negative outputs simultaneously?
Yes, the LT1372HVCN8#PBF can regulate both polarities simultaneously using its dual feedback architecture: the FB pin controls positive outputs referenced to GNDS, while the NFB pin controls negative outputs referenced to the same ground. When both pins are active, the IC prevents either output from exceeding its setpoint - a key capability demonstrated in dual-output flyback applications described in the LT1372HVCN8#PBF datasheet.
What is the purpose of the VC pin on the LT1372HVCN8#PBF?
VC (Pin 1) on the LT1372HVCN8#PBF serves three critical functions: it is the error amplifier output used for loop compensation (via RC network), the soft-start control node (capacitor coupling enables controlled startup), and the current limit adjustment point (external clamping reduces switch current limit). During normal operation, VC voltage varies between ~1.0 V (light load) and ~1.9 V (heavy load), directly controlling duty cycle.
Does the LT1372HVCN8#PBF require an external synchronization signal to operate?
No, the LT1372HVCN8#PBF operates autonomously at its internal 500 kHz switching frequency. The S/S pin is optional: pulling it low enables shutdown (reducing supply current to 12 µA), while applying a 600–800 kHz square wave synchronizes switching. Synchronization is not required for basic operation but improves EMI performance in noise-sensitive systems or when coordinating multiple converters.
How does the LT1372HVCN8#PBF handle overload or short-circuit conditions?
The LT1372HVCN8#PBF employs multiple protection mechanisms: peak current limiting (1.5 A typical) provides pulse-by-pulse switch protection; oscillator frequency shifting reduces switching frequency 5:1 when FB voltage drops below 0.6 V to maintain control under overload; and thermal shutdown activates if junction temperature exceeds 150°C. These features ensure robust fault handling without external circuitry.
LT1372HVCN8#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1372HVCN8#PBF FAQ
1.How can I place an order for LT1372HVCN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1372HVCN8#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 LT1372HVCN8#PBF reliable?
The price and inventory of LT1372HVCN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1372HVCN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1372HVCN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1372HVCN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1372HVCN8#PBF?
LT1372HVCN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1372HVCN8#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 LT1372HVCN8#PBF?
For technical support, including LT1372HVCN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1372HVCN8#PBF requirements.
6.How does Aetrix verify that LT1372HVCN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1372HVCN8#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 LT1372HVCN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1372HVCN8#PBF?
All LT1372HVCN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1372HVCN8#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 LT1372HVCN8#PBF part is unused and in its original packaging.
Return procedure for LT1372HVCN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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