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Analog Devices Inc. LT1372HVCS8#PBF
- Part No.:
- LT1372HVCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1372HVCS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,042
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Product details
Overview
LT1372HVCS8#PBF from Analog Devices (formerly Linear Technology) is a high-voltage monolithic 500kHz current-mode switching regulator IC with integrated 1.5A power switch, designed for boost, buck, flyback, inverting, and Cuk topologies. It operates from 2.7V to 30V input, delivers up to 0.29A output in boost configuration, and features ±10V transient-tolerant feedback pins for robust voltage sensing. It is used in laptop computer supplies, CCFL backlight drivers, and multiple-output flyback converters.
For engineers reviewing the LT1372HVCS8#PBF datasheet, LT1372HVCS8#PBF pinout, LT1372HVCS8#PBF application, or LT1372HVCS8#PBF equivalent, key selection considerations include its 42V switch breakdown voltage (HV variant), 12µA shutdown current, nonlinear error amplifier transconductance for reduced startup overshoot, and compatibility with external synchronization at 600–800kHz.
Technical Context
The LT1372HVCS8#PBF implements peak-current-mode control with an internal 1.245V reference for positive outputs and –2.49V reference for negative outputs, enabling dual-polarity regulation without external op-amps. Its adaptive anti-saturation driver minimizes switch turn-off delay and reduces dissipation during saturation.
It integrates a 500kHz oscillator, soft-start via VC pin clamping, 5:1 oscillator frequency shifting under overload (triggered below 0.6V FB), and logic-level shutdown/synchronization on the S/S pin. The error amplifier provides 1100–1900 µmho transconductance and nonlinear gain staging to suppress output overshoot during load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 450–550 kHz typical; enables use of compact 4.7 µH inductors and reduces board area. |
| Switch Breakdown Voltage | 42 V (HV variant); supports higher input rails and improves margin in 24V industrial or automotive-derived supplies. |
| Integrated Switch Current Limit | 1.5 A typical; defines maximum deliverable output power in boost/buck configurations before foldback. |
| Reference Voltage (FB) | 1.245 V ±15 mV; sets output voltage accuracy and stability across temperature and line variations. |
| Shutdown Supply Current | 12 µA typical; enables ultra-low-power standby in battery-backed systems. |
| Minimum Input Voltage | 2.7 V; allows operation directly from single Li-ion or two NiMH cells without pre-regulation. |
| Error Amplifier Transconductance | 1100–1900 µmho; determines loop gain and compensation component values for stable closed-loop response. |
Pinout & Package
LT1372HVCS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard SOIC-8 footprint and 1.27 mm pitch. Thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation / Error Amplifier Output | Provides access to gm-amplifier output for RC frequency compensation, soft-start, and current limit adjustment. |
| FB (Pin 2) | Positive Feedback Input | Inverting input of main error amplifier; referenced to 1.245 V; senses positive output voltage via resistor divider. |
| NFB (Pin 3) | Negative Feedback Input | Connects to inverting input of dedicated negative-feedback amplifier; regulates at –2.49 V for inverting supplies. |
| S/S (Pin 4) | Shutdown / Synchronization | Logic-compatible input; low level enables shutdown (12 µA IQ); AC-coupled signal synchronizes switching at 600–800 kHz. |
| VIN (Pin 5) | Input Supply | Bypassed with ≥10 µF capacitor; triggers undervoltage lockout below 2.5 V to prevent erratic operation. |
| GND S (Pin 6) | Ground Sense | "Clean" reference ground for internal bandgap, error amp, and NFB amplifier; must be isolated from high-current GND paths. |
| GND (Pin 7) | Power Ground | Emiter connection of internal NPN switch; carries full switch current; requires low-impedance PCB plane connection. |
| VSW (Pin 8) | Switch Collector | Collector of internal 1.5A NPN switch; connects to inductor/diode node; demands shortest possible trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Switch Rating | 42 V breakdown enables reliable operation in 24V-input industrial and telecom power rails. |
| Nonlinear Error Amplifier Transconductance | 10× gain increase above 40 mV FB overdrive suppresses output overshoot during startup and load recovery. |
| 5:1 Oscillator Frequency Shifting | Reduces switching frequency under overload (FB < 0.6 V), limiting peak switch current and protecting external components. |
| External Synchronization Support | Accepts 600–800 kHz logic-level sync signal on S/S pin-enables EMI reduction via fixed-frequency coordination. |
| Dual-Polarity Regulation Architecture | Single IC regulates both positive (via FB) and negative (via NFB) outputs without external amplifiers or complex compensation. |
Applications
| CCFL Backlight Driver | Laptop Computer Power Supply |
|---|---|
Use Scenario: Driving cold cathode fluorescent lamps in notebook displays requiring regulated high-voltage AC output. IC Role / Device Role / Timing Role: Boost controller generating ~1 kV AC via resonant inverter stage; uses FB/NFB pins for precise lamp current regulation. Use Value: Enables compact, efficient, and dimmable backlight solutions with integrated current limiting and fault protection. |
Use Scenario: Generating 5 V or 12 V auxiliary rails from 3.3 V or 5 V system bus in portable computing platforms. IC Role / Device Role / Timing Role: High-efficiency boost regulator operating at 500 kHz; leverages small inductors and minimal board space (<0.5 in²). Use Value: Delivers stable output with 4 mA quiescent current and 12 µA shutdown, extending battery runtime. |
| Multiple-Output Flyback Supply | Inverting DC/DC Converter |
Use Scenario: Providing isolated +12 V and –5 V outputs from a single 5 V input in instrumentation or data acquisition systems. IC Role / Device Role / Timing Role: Flyback controller using dual feedback (FB and NFB) to regulate both polarities simultaneously with shared transformer winding. Use Value: Eliminates need for separate regulators or post-regulators, reducing BOM count and improving cross-regulation. |
Use Scenario: Generating –5 V or –12 V from a positive supply in analog front-ends, sensor interfaces, or op-amp bias networks. IC Role / Device Role / Timing Role: Inverting topology controller; NFB pin directly references –2.49 V to set negative output voltage accurately. Use Value: Achieves tight regulation without external op-amps or precision resistors, simplifying layout and calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1372CS8#PBF | Standard 35 V switch breakdown (vs. 42 V); identical pinout, frequency, and feature set. | Not suitable for >35 V input rails or high-transient environments where HV rating is critical. | Select LT1372HVCS8#PBF when input voltage may exceed 35 V or when enhanced surge immunity is required. |
| LT3573EDD#TRPBF | 40 V input, 2.5 A switch, 2.2 MHz switching; requires external compensation; no NFB pin for negative regulation. | Higher efficiency at light loads but lacks native dual-polarity feedback architecture. | Choose LT3573EDD#TRPBF for higher-frequency, higher-current designs where negative output is generated separately. |
Compared with LT1372CS8#PBF, the LT1372HVCS8#PBF adds 7 V headroom on switch breakdown-critical for reliability in 24 V systems with line transients. Versus LT3573EDD#TRPBF, it trades higher switching frequency for integrated negative feedback capability and simpler compensation, favoring cost-sensitive, dual-rail designs.
Availability
LT1372HVCS8#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, and multiple-output flyback supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1372HVCS8#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 its legacy high-performance analog and power management product lines with full datasheet, simulation model, and application support.
The LT1372HVCS8#PBF belongs to Linear's monolithic current-mode switching regulator family, engineered for compact, high-efficiency DC/DC conversion in space-constrained and thermally demanding applications such as portable computing and industrial power supplies.
FAQ
What is the maximum input voltage rating for LT1372HVCS8#PBF?
The LT1372HVCS8#PBF has an absolute maximum supply voltage (VIN) of 30 V and a switch breakdown voltage (BV) of 42 V at 0°C to 125°C junction temperature. This 42 V rating distinguishes it from the standard LT1372CS8#PBF (35 V), making LT1372HVCS8#PBF suitable for 24 V input systems with transient margins. Exceeding 30 V on VIN risks permanent damage regardless of switch rating.
Can LT1372HVCS8#PBF regulate negative output voltages?
Yes, the LT1372HVCS8#PBF can directly regulate negative outputs using the NFB pin, which references an internal –2.49 V threshold. When configured in inverting topology, the NFB pin connects to a resistor divider from the negative output rail, enabling accurate regulation without external op-amps. The FB pin remains unused in this mode, preserving its 1.245 V reference for future positive-rail expansion.
What is the purpose of the VC pin on LT1372HVCS8#PBF?
The VC pin on LT1372HVCS8#PBF serves three critical functions: (1) it is the output of the error amplifier for external RC frequency compensation; (2) it enables soft-start by clamping with a capacitor; and (3) it allows adjustable current limiting by externally controlling the voltage applied to this node. During normal operation, VC sits between 1.0 V and 1.9 V depending on load, and pulling it below 0.8 V forces zero duty cycle and idle mode.
Does LT1372HVCS8#PBF support external synchronization?
Yes, LT1372HVCS8#PBF supports external synchronization via the S/S pin, accepting logic-level square waves from 600 kHz to 800 kHz. This allows EMI reduction through frequency coordination with other system clocks. Synchronization is guaranteed only within that range; operation above 800 kHz may cause subharmonic oscillation due to reduced internal slope compensation, especially at >50% duty cycle.
How does LT1372HVCS8#PBF handle overload or short-circuit conditions?
The LT1372HVCS8#PBF employs two complementary protections: (1) pulse-by-pulse current limiting trips the 1.5 A switch at ~1.7 A (80% duty cycle), and (2) oscillator frequency shifting reduces switching frequency 5:1 when FB falls below 0.6 V-lowering peak current and thermal stress. Unlike latch-off devices, it continues switching at reduced frequency, enabling self-recovery after fault removal without requiring reset.
LT1372HVCS8#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1372HVCS8#PBF FAQ
1.How can I place an order for LT1372HVCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1372HVCS8#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 LT1372HVCS8#PBF reliable?
The price and inventory of LT1372HVCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1372HVCS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1372HVCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1372HVCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1372HVCS8#PBF?
LT1372HVCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1372HVCS8#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 LT1372HVCS8#PBF?
For technical support, including LT1372HVCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1372HVCS8#PBF requirements.
6.How does Aetrix verify that LT1372HVCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1372HVCS8#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 LT1372HVCS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1372HVCS8#PBF?
All LT1372HVCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1372HVCS8#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 LT1372HVCS8#PBF part is unused and in its original packaging.
Return procedure for LT1372HVCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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