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Analog Devices Inc. LT1372IS8#PBF
- Part No.:
- LT1372IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1372IS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,872
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Product details
Overview
LT1372IS8#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 operates in boost, buck, flyback, inverting, and Cuk topologies, supports ±2.7V to 25V input, regulates positive or negative outputs, and delivers up to 0.29A at 12V in boost configuration for laptop supplies and CCFL backlight drivers.
For engineers reviewing the LT1372IS8#PBF datasheet, LT1372IS8#PBF pinout, LT1372IS8#PBF application, or LT1372IS8#PBF equivalent, key selection factors include its 500kHz fixed switching frequency, 1.245V internal reference, 12µA shutdown current, 2.7V minimum input voltage, and dual feedback capability for bipolar output regulation - all validated for industrial temperature range (–40°C to 125°C).
Technical Context
The LT1372IS8#PBF uses 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 (1100–1900 µmho) that increases tenfold above 40mV overdrive to suppress startup/overload overshoot.
Switching is synchronized externally via the S/S pin (600–800 kHz range), while oscillator frequency shifts 5:1 when FB voltage drops below 0.6V - a protection mechanism during overload. The VC pin serves triple duty: compensation node, soft-start control point, and current-limit adjustment interface.
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 (2.7V cutoff) through 24V industrial rails. |
| Output Switch Current Limit | 1.5 A typical - sets maximum deliverable load current in boost/buck configurations. |
| Reference Voltage | 1.245 V ±15 mV - defines precision feedback threshold for positive output regulation. |
| Negative Reference Voltage | –2.49 V ±50 mV - enables direct negative output sensing without external op-amps. |
| Quiescent Current | 4 mA typical - minimizes no-load power loss in battery-powered systems. |
| Shutdown Current | 12 µA typical - extends battery life during system sleep modes. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and automotive under-hood applications. |
Pinout & Package
LT1372IS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC outline, 1.27 mm pitch, and thermal resistance θJA = 120°C/W. Pin 1 is VC (compensation), Pin 2 is FB (positive feedback), Pin 3 is NFB (negative feedback), Pin 4 is S/S (shutdown/sync), Pin 5 is VIN (input supply), Pin 6 is GNDS (clean ground sense), Pin 7 is GND (power ground), Pin 8 is VSW (switch collector).
| 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) | Inverting input of positive error amplifier | Connected to resistor divider for +VOUT regulation; triggers oscillator frequency shift on overvoltage. |
| NFB (Pin 3) | Inverting input of negative feedback amplifier | Enables –VOUT regulation at –2.49 V reference; requires 100 kΩ series resistor per internal architecture. |
| S/S (Pin 4) | Shutdown enable / external sync input | Logic-low (<1.3 V) disables switching; AC-coupled square wave synchronizes oscillator. |
| VIN (Pin 5) | Main input supply bypass node | Requires ≥10 µF ceramic capacitor; undervoltage lockout activates below 2.5 V. |
| GNDS (Pin 6) | Reference ground for analog circuitry | Separates sensitive error amp and reference from high-current power ground paths. |
| GND (Pin 7) | Power ground / switch emitter return | Must connect directly to low-impedance ground plane to minimize noise coupling into control circuitry. |
| VSW (Pin 8) | Collector of integrated NPN power switch | High di/dt node - demands shortest possible trace to inductor and output diode to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5A NPN power switch | Eliminates external transistor and drive circuitry; reduces BOM count and layout complexity. |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting and superior line transient response vs. voltage-mode. |
| Dual feedback capability (FB/NFB) | Supports simultaneous regulation of positive and negative outputs in flyback or inverting topologies. |
| Nonlinear error amplifier transconductance | Reduces output overshoot by 10× gain increase during startup or overload recovery events. |
| 5:1 oscillator frequency shift on overload | Lowers switching frequency to extend minimum duty cycle and maintain control under fault conditions. |
| External synchronization (600–800 kHz) | Enables noise-sensitive systems to align switching with quiet time slots or avoid EMI bands. |
Applications
| Laptop Computer Power Supply | CCFL Backlight Driver |
|---|---|
Use Scenario: Generating 12V/0.29A from 5V USB or battery input for LCD panel backlight inverters. IC Role / Device Role / Timing Role: Boost regulator controlling MOSFET gate drive timing and current limit in resonant inverter stage. Use Value: Enables compact, high-efficiency DC-DC conversion with <0.5 in² board area using surface-mount components. |
Use Scenario: Driving cold cathode fluorescent lamps requiring stable high-voltage AC output from low-voltage DC source. IC Role / Device Role / Timing Role: High-frequency current-mode controller regulating lamp current via resonant tank frequency modulation. Use Value: Delivers precise current regulation and fast overload protection to prevent lamp arc instability or transformer saturation. |
| Multiple Output Flyback Supply | Inverting DC-DC Converter |
Use Scenario: Providing isolated +12V and –5V outputs from single 5V input in industrial I/O modules. IC Role / Device Role / Timing Role: Dual-feedback flyback controller managing cross-regulation between positive and negative secondaries. Use Value: Achieves ±1% output accuracy across load and line variations without optocouplers or post-regulators. |
Use Scenario: Converting +5V rail to –3.3V for analog sensor biasing or op-amp dual supplies in portable instrumentation. IC Role / Device Role / Timing Role: Inverting topology regulator using NFB pin to set –3.3V output referenced to system ground. Use Value: Eliminates need for separate negative charge pump or inverting IC, reducing component count and quiescent current. |
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 | Commercial grade (0°C to 70°C); identical electrical specs and pinout. | Not rated for industrial ambient temperatures; unsuitable for extended outdoor or under-hood use. | Select LT1372IS8#PBF when operating beyond 70°C ambient or requiring guaranteed performance at –40°C. |
| LT1377IS8#PBF | 1 MHz switching frequency; same package and pinout but higher fSW and lower max output current (0.25A). | Better suited for ultra-compact designs needing smaller inductors; trades output current for higher frequency. | Choose LT1372IS8#PBF when >0.25A output current is required or when 500kHz operation simplifies EMI filtering. |
Compared with LT1372CS8#PBF, LT1372IS8#PBF adds industrial temperature qualification without altering footprint or functionality; compared with LT1377IS8#PBF, it trades 1MHz switching for higher output current capability and relaxed EMI constraints.
Availability
LT1372IS8#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, multiple-output flyback converters, and inverting DC-DC converters requiring stable component supply across industrial temperature ranges.
Supply support for LT1372IS8#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 of high-performance analog and power management ICs with rigorous reliability testing and long-term product support.
The LT1372IS8#PBF belongs to Linear's monolithic switching regulator family designed for high-efficiency, multi-topology DC-DC conversion in space-constrained industrial and portable systems.
FAQ
What is the maximum output current achievable with LT1372IS8#PBF in a 5V-to-12V boost configuration?
The LT1372IS8#PBF delivers up to 0.29A at 12V output when configured as a boost converter from 5V input, as specified in the datasheet's "Typical Applications" section and confirmed by efficiency curves (Figure TA02). This limit arises from the 1.5A internal switch current rating, duty cycle constraints, and thermal dissipation in the SOIC package at 125°C junction temperature.
Can LT1372IS8#PBF regulate both positive and negative outputs simultaneously?
Yes, the LT1372IS8#PBF supports dual-polarity output voltage sensing using both FB and NFB pins. When both pins are connected to independent resistor dividers, the IC prevents either output from exceeding its setpoint - e.g., in a dual-output flyback converter where one output sags under heavy load while the other remains regulated. Load on the FB pin must not exceed 250 µA when NFB is active.
What is the purpose of the VC pin on LT1372IS8#PBF, and how is it used in design?
The VC pin on LT1372IS8#PBF serves three critical functions: it is the error amplifier output for loop compensation (via RC network), the soft-start control node (via capacitor coupling), and the current-limit adjustment interface (via external clamp). During normal operation, VC voltage varies between ~1.0V (light load) and ~1.9V (heavy load), and pulling it below 0.8V forces zero duty cycle and idle mode.
Does LT1372IS8#PBF require external components for basic boost operation?
Yes, LT1372IS8#PBF requires external components for functional boost operation: a 4.7 µH inductor (or 10 µH per note), Schottky output diode (e.g., MBRS120T3), input/output capacitors (e.g., 22 µF tantalum each), and resistor divider (R1/R2) for feedback. The datasheet provides exact values and part recommendations - e.g., R2 = 6.19kΩ for 12V output - ensuring stable regulation without additional ICs.
How does LT1372IS8#PBF handle overload or short-circuit conditions?
The LT1372IS8#PBF employs multiple protection mechanisms: peak-current limiting (1.5A typical), oscillator frequency shifting (5:1 reduction when FB < 0.6V), and thermal shutdown. Under sustained overload, frequency shift extends minimum duty cycle to retain control, while the current-limited switch prevents destructive dissipation. Unlike some regulators, it lacks automatic hiccup mode - recovery requires cycling EN or input voltage.
LT1372IS8#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1372IS8#PBF FAQ
1.How can I place an order for LT1372IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1372IS8#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 LT1372IS8#PBF reliable?
The price and inventory of LT1372IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1372IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1372IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1372IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1372IS8#PBF?
LT1372IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1372IS8#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 LT1372IS8#PBF?
For technical support, including LT1372IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1372IS8#PBF requirements.
6.How does Aetrix verify that LT1372IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1372IS8#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 LT1372IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1372IS8#PBF?
All LT1372IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1372IS8#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 LT1372IS8#PBF part is unused and in its original packaging.
Return procedure for LT1372IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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