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Analog Devices Inc. LT1372CS8#PBF
- Part No.:
- LT1372CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1372CS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:751
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Product details
Overview
LT1372CS8#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, operates down to 2.7V input, delivers up to 0.29A output in boost configuration, and is used in laptop computer supplies and CCFL backlight drivers.
For engineers reviewing the LT1372CS8#PBF datasheet, LT1372CS8#PBF pinout, LT1372CS8#PBF application, or LT1372CS8#PBF equivalent, key selection criteria include its 500kHz fixed switching frequency, ±1.245V/–2.49V dual-reference capability for positive/negative regulation, 4mA typical quiescent current, 12µA shutdown current, and SO-8 thermal resistance of 120°C/W.
Technical Context
The LT1372CS8#PBF employs 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 error to suppress startup/overload overshoot.
It integrates dual feedback paths: FB pin referenced to +1.245V for positive outputs and NFB pin referenced to –2.49V for negative outputs, sharing one error amplifier core. The VC pin serves simultaneously as compensation node, soft-start control point, and current-limit adjustment terminal via external clamping.
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. |
| Integrated Switch Current Limit | 1.5 A typical - defines maximum peak inductor current in boost/buck configurations. |
| Reference Voltage (FB) | +1.245 V - sets output voltage via resistor divider; tolerance ±15 mV ensures <1% output error at mid-load. |
| Reference Voltage (NFB) | –2.490 V - enables direct negative output regulation without external op-amps. |
| Quiescent Supply Current | 4 mA typical - supports battery-powered applications with low standby loss. |
| Shutdown Supply Current | 12 µA typical - allows ultra-low-power system sleep modes. |
| Minimum Input Voltage | 2.7 V - permits operation from single Li-ion or two NiMH cells. |
| Output Switch Breakdown Voltage | 35 V - supports boost outputs up to ~30 V with margin. |
Pinout & Package
LT1372CS8#PBF is housed in an 8-lead plastic SOIC (SO-8) package with standard JEDEC MS-012AC footprint, 1.27 mm pitch, and 120°C/W junction-to-ambient thermal resistance.
| 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 | Inverting input of main error amp; tied internally to +1.245 V reference. |
| NFB (Pin 3) | Negative output voltage sense input | Connects via 100 kΩ resistor to inverting input of negative-feedback amp; regulates at –2.49 V. |
| S/S (Pin 4) | Shutdown and synchronization input | Logic-level compatible; low = shutdown (12 µA IQ); AC-coupled square wave synchronizes switching at 600–800 kHz. |
| VIN (Pin 5) | Input supply bypass terminal | Requires ≥10 µF ceramic/tantalum capacitor; triggers UVLO below 2.5 V. |
| GND S (Pin 6) | Clean analog ground reference | Reference for internal bandgap, error amps, and NFB path; must be isolated from high-current GND. |
| GND (Pin 7) | Power switch emitter return | Carries full switch current; connect directly to low-impedance ground plane. |
| VSW (Pin 8) | Power switch collector output | Drives external inductor/diode; requires shortest possible PCB trace to minimize 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 supplies without external amplifiers. |
| Nonlinear error amplifier transconductance | Transconductance jumps 10× when FB error exceeds 40 mV, reducing output overshoot during startup and load recovery. |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB voltage drops below 0.6 V, limiting peak switch current during overload. |
| External synchronization | Accepts 600–800 kHz logic-level clock on S/S pin, enabling noise-sensitive systems to avoid EMI bands. |
| Low minimum input voltage | Operates from 2.7 V input, supporting single-cell Li-ion and energy-harvesting applications. |
| Integrated anti-saturation driver | Adaptively adjusts base drive to minimize switch saturation time and driver dissipation, improving efficiency at high duty cycles. |
Applications
| Laptop Computer Power Supply | CCFL Backlight Driver |
|---|---|
Use Scenario: Generating 12 V from 5 V USB or battery input for display subsystems in portable computing devices. IC Role / Device Role / Timing Role: Primary DC-DC boost controller regulating output with current-mode feedback and fast transient response. Use Value: Enables compact, high-efficiency design using only 0.5 in² board area and surface-mount components. |
Use Scenario: Driving cold cathode fluorescent lamps requiring stable high-voltage AC (≈600 VAC) from low-voltage DC bus. IC Role / Device Role / Timing Role: High-frequency flyback controller with precise current limiting and soft-start to prevent lamp strike failure. Use Value: Delivers regulated lamp current via transformer secondary sensing while maintaining <1% output ripple under dimming modulation. |
| Multiple Output Flyback Supply | Inverting DC-DC Converter |
Use Scenario: Providing isolated +12 V and –5 V rails from a single 5 V input in industrial I/O modules. IC Role / Device Role / Timing Role: Dual-feedback flyback controller using both FB and NFB pins to regulate positive and negative outputs independently. Use Value: Eliminates need for secondary-side optocouplers or post-regulators, reducing BOM count and improving cross-regulation. |
Use Scenario: Generating –5 V from +5 V rail for analog sensor biasing or op-amp dual supplies in medical instrumentation. IC Role / Device Role / Timing Role: Inverting topology controller with NFB-based regulation and low-noise GND S reference. Use Value: Achieves <±1% output accuracy over temperature without external compensation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1372IS8#PBF | Same architecture and pinout; rated for –40°C to 125°C industrial temperature range vs. 0°C to 125°C commercial grade. | Required for extended-temperature environments such as automotive cabin electronics or outdoor industrial controllers. | Select LT1372IS8#PBF when operating ambient exceeds 70°C or storage conditions fall below 0°C. |
| LT1377CS8#PBF | 1 MHz switching frequency (vs. 500 kHz), same SO-8 package and pinout; lower max output current (0.35A vs. 0.29A in boost). | Better suited for space-constrained designs needing smaller magnetics; trade-off is higher switching loss at high load. | Choose LT1377CS8#PBF when board area is critical and load current remains ≤300 mA. |
Compared with LT1372CS8#PBF, LT1372IS8#PBF offers extended temperature reliability without layout change, while LT1377CS8#PBF trades higher frequency for reduced inductor size at the cost of slightly lower efficiency above 200 mA.
Availability
LT1372CS8#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 commercial temperature ranges.
Supply support for LT1372CS8#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 series.
The LT1372CS8#PBF belongs to Linear Technology's high-frequency current-mode switching regulator family, designed specifically for compact, efficient DC-DC conversion in portable and space-constrained applications where low quiescent current and dual-polarity regulation are essential.
FAQ
What is the maximum output current achievable with LT1372CS8#PBF in a boost configuration?
The LT1372CS8#PBF supports up to 0.29 A output current in boost topology, as specified in the datasheet under "IOUT (LT1372)" at 10 µH inductor. This limit arises from the 1.5 A switch current rating, duty cycle constraints, and thermal dissipation in the SO-8 package. Exceeding this current risks thermal shutdown or reduced efficiency due to increased conduction losses in the integrated switch.
Can LT1372CS8#PBF regulate both positive and negative outputs simultaneously?
Yes, the LT1372CS8#PBF can regulate both polarities simultaneously using its dual feedback architecture: the FB pin (referenced to +1.245 V) controls the positive output, and the NFB pin (referenced to –2.49 V) controls the negative output. In dual-output flyback designs, it prevents either rail from overvoltage by acting on whichever feedback signal deviates first, ensuring safe no-load regulation without secondary-side components.
What is the purpose of the GND S (Pin 6) versus GND (Pin 7) distinction on LT1372CS8#PBF?
GND S (Pin 6) is the clean analog ground reference for the internal bandgap, error amplifiers, and NFB path, requiring a quiet, low-noise connection separate from high-current return paths. GND (Pin 7) is the power switch emitter return, carrying pulsed switch currents up to 1.5 A. Separating these grounds prevents switching noise from corrupting regulation accuracy and ensures stable feedback operation.
Does LT1372CS8#PBF support external clock synchronization, and what is the valid frequency range?
Yes, LT1372CS8#PBF supports external synchronization via the S/S pin. For the LT1372 variant, the guaranteed synchronization range is 600 kHz to 800 kHz; operation outside this range may result in unstable or skipped switching cycles. The part also includes a 12 µs resettable delay to prevent false shutdown during sync signal transitions, ensuring robust timing alignment.
How does the VC pin on LT1372CS8#PBF function beyond compensation?
The VC pin on LT1372CS8#PBF serves three critical roles: (1) frequency compensation node (via RC network), (2) soft-start control point (capacitor coupling enables controlled ramp-up), and (3) current limit adjustment terminal (external clamp limits max VC voltage, thereby capping switch current). Its voltage (typically 0.8–1.9 V) directly sets the current comparator threshold, making it central to both stability and protection.
LT1372CS8#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):
- 35V (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
LT1372CS8#PBF FAQ
1.How can I place an order for LT1372CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1372CS8#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 LT1372CS8#PBF reliable?
The price and inventory of LT1372CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1372CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1372CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1372CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1372CS8#PBF?
LT1372CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1372CS8#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 LT1372CS8#PBF?
For technical support, including LT1372CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1372CS8#PBF requirements.
6.How does Aetrix verify that LT1372CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1372CS8#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 LT1372CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1372CS8#PBF?
All LT1372CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1372CS8#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 LT1372CS8#PBF part is unused and in its original packaging.
Return procedure for LT1372CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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