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Analog Devices Inc. LT1186FIS#PBF
- Part No.:
- LT1186FIS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Lighting, Ballast Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1186FIS#PBF.pdf
- Description:
- IC CCFL CNTRL 225KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,850
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Product details
Overview
LT1186FIS#PBF from Analog Devices (formerly Linear Technology) is a DAC-programmable, fixed-frequency current-mode CCFL switching regulator with integrated 8-bit 50µA full-scale current-output DAC, 200kHz oscillator, and high-side NPN power switch rated for 1.25A min. It supports grounded or floating lamp configurations, provides open-lamp protection, and operates from 4.5V–30V battery input for notebook backlight control.
For engineers reviewing the LT1186FIS#PBF datasheet, LT1186FIS#PBF pinout, LT1186FIS#PBF application, or LT1186FIS#PBF equivalent, key selection criteria include its 50µA DAC full-scale programming current, 200kHz switching frequency, 16-pin SO package, shutdown quiescent current of 35µA, and dual SPI/pulse-mode digital interface compatibility with 3.3V/5V logic supplies.
Technical Context
The LT1186FIS#PBF implements a fixed-frequency current-mode control architecture where switch duty cycle is determined by real-time comparison of sensed switch current against a DAC-programmed trip threshold at the CCFL VC pin. Its internal 2.4V LDO enables stable operation across 3V–6.5V VCC while maintaining <9.5mA typical IQ at half-scale DAC output.
It integrates dual sensing paths: ICCFL pin accepts 0–50µA DAC current to set lamp current in grounded-lamp topologies, while BAT/ROYER pins enable primary-side current sensing for floating-lamp configurations with 0.1Ω internal sense resistor and 0.1%/V line regulation. Open-lamp protection activates via BULB pin comparator clamping CCFL VC when BAT–BULB voltage exceeds 7.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 8-bit - enables 256 discrete lamp current steps with monotonic response and ±2 LSB DNL. |
| Switching Frequency | 200 kHz typical - minimizes magnetic component size (e.g., CTX210605 inductor) and EMI while supporting >90% efficiency. |
| Full-Scale DAC Current | 50 µA ±3 µA - directly programs 0–6 mA lamp current in typical displays via ICCFL summing node at 0.465 V reference. |
| Supply Current (IQ) | 6 mA typical - measured at VCC = 3–6.5 V, ½ full-scale DAC output; increases ~20 mA/A with switch current due to forced beta ≈ 50. |
| Shutdown Current | 35 µA typical - achieved by pulling SHDN low; DAC retains last setting for seamless brightness resume. |
| Switch Breakdown Voltage | 60 V min - supports CCFL VSW operation up to 60 V, enabling robust Royer transformer secondary drive. |
| Operating Temp Range | –40°C to +100°C - specified for LT1186FIS grade, suitable for industrial portable equipment environments. |
Pinout & Package
LT1186FIS#PBF is housed in a 16-lead narrow SOIC (S package) with exposed pad not present; JEDEC MS-012AC compliant. Pin 1 is CCFL PGND (emitter of internal NPN switch), and pin numbering follows standard SOIC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CCFL PGND (1) | Power switch emitter / high-current ground | Carries full switch current; must be star-grounded separately from AGND to avoid noise coupling into analog control loop. |
| ICCFL (2) | DAC current sink input | Regulated to 0.465 V; accepts 0–50 µA programming current to set lamp current; defines "bits-to-nits" mapping. |
| DIO (3) | Grounded-lamp current return / diode common | In grounded-lamp mode, conducts bidirectional lamp current; in floating mode, tied to GND to disable internal diodes. |
| CCFL VC (4) | Lamp current servo node / loop compensation | High-impedance node where DAC source current nulls against lamp-sense current; capacitor here sets single-pole loop response. |
| AGND (5) | Analog reference ground | Reference for 1.24 V bandgap and ICCFL summing; connects only low-current signal paths and compensation components. |
| SHDN (6) | Active-low shutdown control | Pulling low disables oscillator and power switch, reducing IQ to 35 µA; DAC state retained for instant recovery. |
| CLK (7) | SPI clock / pulse-mode increment trigger | Schmitt-trigger input; rising edge shifts data in SPI mode or increments/decrements counter in pulse mode. |
| CS (8) | Chip select / mode latch | Low enables SPI data transfer; on power-up, high configures pulse mode; CS low then forces SPI mode until reset. |
| DIN/UP-DN (9) | SPI data input / pulse-mode direction control | In SPI: serial data input; in pulse mode: logic level selects increment-only (1-wire) or increment/decrement (2-wire). |
| DOUT (10) | SPI data output / three-state | Three-state unless CS is low; outputs previous 8-bit DAC value on falling CLK edges during SPI transfer. |
| IOUT (11) | DAC current output | Provides 50 µA full-scale current; tied internally to ICCFL; bias voltage stable (<±5 mV) over temperature and supply. |
| VCC (12) | Logic supply input | Accepts 3.0–6.5 V; powers internal 2.4 V LDO; undervoltage lockout engages below ~2.5 V with no hysteresis. |
| ROYER (13) | Floating-lamp primary current sense (−) | In floating configuration, forms differential pair with BAT to measure Royer center-tap current via 0.1 Ω internal resistor. |
| BAT (14) | Battery input / floating-lamp sense (+) | Connects to battery or adapter (4.5–30 V); supplies bias to programmer block; part of open-lamp clamp with BULB pin. |
| BULB (15) | Open-lamp protection comparator input | Monitors voltage across Royer primary; triggers clamp when BAT–BULB > 7.0 V to prevent transformer overvoltage. |
| CCFL VSW (16) | Power switch collector output | Drives Royer transformer primary; rated ≥1.25 A; breakdown ≥60 V; on-resistance ≤1.0 Ω at 1 A. |
Key Features
| Feature | Design Value |
|---|---|
| Bits-to-Nits™ DAC programming | Direct 0–50 µA ICCFL current control maps linearly to 0–6 mA lamp current, enabling precise, hysteresis-free brightness adjustment. |
| Dual lamp configuration support | Single IC supports both grounded-lamp (via DIO/ICCFL) and floating-lamp (via BAT/ROYER) topologies without external component changes. |
| Integrated open-lamp protection | BULB pin comparator clamps CCFL VC when BAT–BULB exceeds 7.0 V, forcing voltage-mode operation to limit secondary output during fault conditions. |
| Retained DAC state in shutdown | SHDN low reduces supply current to 35 µA while preserving DAC counter value, enabling immediate brightness restoration on wake-up. |
| Flexible digital interface | Configurable between standard SPI (8-bit read/write) and pulse mode (1-wire increment or 2-wire increment/decrement) based on CS/DIN levels at power-up. |
Applications
| Notebook Backlight Control | Portable Instrument Display |
|---|---|
Use Scenario: Regulating CCFL brightness in 12–17-inch laptop LCD panels with battery-powered operation and thermal constraints. IC Role / Device Role / Timing Role: Primary CCFL current controller implementing current-mode PWM with DAC-programmed trip threshold and Royer transformer drive. Use Value: Enables 256-step dimming with zero pop-on, 90% efficiency, and <10 mm height compliance-critical for thin clamshell designs. |
Use Scenario: Driving CCFL backlights in handheld multimeters, oscilloscopes, and medical monitors requiring wide dimming range and low standby power. IC Role / Device Role / Timing Role: High-reliability CCFL regulator with open-lamp fault detection and shutdown retention for field-deployed instruments. Use Value: Delivers stable lamp current across –40°C to +100°C ambient, extends battery life via 35 µA shutdown current, and prevents display failure during lamp aging. |
| Retail Point-of-Sale Terminal | Industrial HMI Panel |
Use Scenario: Powering CCFL backlights in kiosk and checkout displays operating continuously in ambient temperatures up to 50°C. IC Role / Device Role / Timing Role: Fixed-frequency current-mode regulator with thermal shutdown and line regulation <0.16%/V to maintain consistent brightness despite AC adapter ripple. Use Value: Ensures flicker-free illumination under varying input voltage (4.5–30 V), eliminates need for external current sense resistors, and simplifies BOM with integrated DAC. |
Use Scenario: Controlling CCFL backlights in factory-floor HMIs exposed to vibration, dust, and wide input voltage fluctuations. IC Role / Device Role / Timing Role: Robust CCFL driver with grounded/floating lamp flexibility, 60 V VSW rating, and BULB pin-based open-lamp protection for unattended operation. Use Value: Reduces field failures via automatic fault response, supports retrofit into legacy designs using either lamp topology, and maintains brightness accuracy over 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1182CS#PBF | Fixed 50 µA full-scale DAC; no pulse-mode interface; requires external clock; lacks BULB pin open-lamp protection. | Designed for simpler, cost-sensitive CCFL systems without programmable shutdown retention or dual lamp topology support. | Choose when only SPI interface and basic current regulation are needed; not suitable for pulse-mode microcontrollers or floating-lamp layouts. |
| MAX8722ETI+ | 10-bit DAC; 1.5 MHz switching frequency; integrated gate drivers; requires external MOSFETs; no internal NPN switch. | Targets higher-power CCFL arrays (>10 mA) and multi-lamp systems with independent channel control and thermal monitoring. | Choose for scalable multi-lamp designs or when higher switching frequency is required to shrink magnetics; adds complexity and external FET cost. |
Compared with LT1186FIS#PBF, LT1182CS#PBF offers lower integration and reduced fault protection but lower system cost, while MAX8722ETI+ delivers higher resolution and frequency at the expense of external component count and layout complexity-making LT1186FIS#PBF optimal for single-lamp, space-constrained, battery-operated applications requiring flexible interface and robust protection.
Availability
LT1186FIS#PBF is available at Aetrix Electronics and suitable for notebook backlight control, portable instrument display, and retail terminal applications requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.
Supply support for LT1186FIS#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 all Linear ICs, including precision analog, power management, and interface products.
The LT1186FIS#PBF belongs to Linear's CCFL backlight regulator product line, designed specifically for energy-efficient, digitally programmable cold cathode fluorescent lamp control in portable and industrial display systems.
FAQ
What is the function of the CCFL VC pin on the LT1186FIS#PBF?
The CCFL VC pin on the LT1186FIS#PBF serves as the lamp current servo node where DAC-provided source current nulls against lamp-sense current. It determines the switch turn-off threshold, hosts loop compensation capacitance, and supports external voltage clamping for current limiting. Its voltage ranges from 0.95 V to 2.0 V during normal operation, and it enables single-pole transient response behavior critical for stable CCFL regulation in the LT1186FIS#PBF.
Does the LT1186FIS#PBF retain its DAC setting during shutdown?
Yes, the LT1186FIS#PBF retains its DAC setting during shutdown: when the SHDN pin is pulled low, total supply current drops to 35 µA typical, but the 8-bit DAC counter preserves its last value. Upon release of SHDN, the LT1186FIS#PBF immediately resumes operation at the prior programmed lamp current level-enabling seamless brightness recovery without host MCU reinitialization.
Can the LT1186FIS#PBF drive both grounded and floating CCFL lamp configurations?
Yes, the LT1186FIS#PBF supports both grounded and floating lamp configurations. In grounded-lamp mode, DIO connects to the lamp's low side and ICCFL sets current via direct lamp current sensing. In floating-lamp mode, DIO is grounded and lamp current is sensed via BAT/ROYER differential inputs measuring Royer primary current-eliminating parasitic frame capacitance losses and enabling symmetric drive without redesigning the LT1186FIS#PBF circuit.
What is the maximum lamp current achievable with the LT1186FIS#PBF?
The LT1186FIS#PBF supports up to 6 mA lamp current in typical display applications, corresponding to its 0–50 µA ICCFL programming range. This is achieved using the internal 0.1 Ω high-side sense resistor and current-mode control loop. The actual maximum depends on external components (e.g., transformer turns ratio, inductor value), but the LT1186FIS#PBF's 1.25 A minimum switch current and 60 V VSW rating ensure headroom for reliable operation across this range.
How does the LT1186FIS#PBF implement open-lamp protection?
The LT1186FIS#PBF implements open-lamp protection via the BULB pin, which monitors voltage across the Royer transformer primary. When BAT–BULB exceeds 7.0 V (typical), a comparator sinks current into the CCFL VC pin, forcing the regulator from current-mode to voltage-mode operation. This limits secondary output voltage, prevents transformer overvoltage stress, and protects the LT1186FIS#PBF and lamp circuitry-without requiring external fault-detection circuitry.
LT1186FIS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Bits-to-Nits™
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- CCFL Controller
- Frequency:
- 175kHz ~ 225kHz
- Voltage - Supply:
- 4.5V ~ 30V
- Current - Supply:
- 6 mA
- Current - Output Source/Sink:
- -
- Dimming:
- No
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1186FIS#PBF FAQ
1.How can I place an order for LT1186FIS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1186FIS#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 LT1186FIS#PBF reliable?
The price and inventory of LT1186FIS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1186FIS#PBF is usually 5 days.
3.What payment methods are accepted for LT1186FIS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1186FIS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1186FIS#PBF?
LT1186FIS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1186FIS#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 LT1186FIS#PBF?
For technical support, including LT1186FIS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1186FIS#PBF requirements.
6.How does Aetrix verify that LT1186FIS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1186FIS#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 LT1186FIS#PBF meets industry standards.
7.What is the process for return or replacement of LT1186FIS#PBF?
All LT1186FIS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1186FIS#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 LT1186FIS#PBF part is unused and in its original packaging.
Return procedure for LT1186FIS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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