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Analog Devices Inc. LT1184FIS#TRPBF
- Part No.:
- LT1184FIS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1184FIS#TRPBF.pdf
- Description:
- IC REG CONV CCFL 1OUT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,880
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Product details
Overview
LT1184FIS#TRPBF from Analog Devices (formerly Linear Technology) is a CCFL backlight switching regulator IC designed for cold cathode fluorescent lamp control in portable displays. It features 1.25A CCFL switch current, 200kHz switching frequency, 3V–30V input range, 6mA lamp current capability, and supports both grounded and floating lamp configurations with open-lamp protection.
For engineers reviewing the LT1184FIS#TRPBF datasheet, LT1184FIS#TRPBF pinout, LT1184FIS#TRPBF application, or LT1184FIS#TRPBF equivalent, key selection criteria include CCFL lamp current programming via ICCFL pin, DIO-based half-wave current sensing, CCFL VC loop compensation, and compatibility with Royer transformer topologies in notebook and automotive display power supplies.
Technical Context
The LT1184FIS#TRPBF implements current-mode switching control with cycle-by-cycle current limiting for stable CCFL regulation. Its internal high-side sense servo provides 0.93–1.07A null current at ICCFL = 100µA, enabling precise lamp current control independent of input voltage variation.
It integrates a 200kHz oscillator, reference voltage (1.244V typ), shutdown logic with 0.85V threshold, and dedicated pins for lamp current programming (ICCFL), current sensing (DIO), and loop compensation (CCFL VC), all optimized for Royer-based CCFL inverters requiring fast transient response and open-lamp fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V - supports wide battery and adapter supply rails without external regulators |
| CCFL Switch Current Limit | 1.25A min at 50% duty cycle - sufficient for driving up to 6mA CCFL lamps with margin |
| Switching Frequency | 200kHz typ - enables compact magnetics and reduces EMI compared to lower-frequency alternatives |
| Quiescent Supply Current | 6mA typ - low standby power ideal for portable applications with battery life constraints |
| Shutdown Current | 35µA typ - enables deep sleep mode during display off periods |
| Reference Voltage | 1.244V ±20mV - stable internal reference for accurate lamp current programming |
| CCFL VC Summing Voltage | 0.465V typ - sets lamp current trip point; 100µA ICCFL yields ~6mA lamp current |
Pinout & Package
LT1184FIS#TRPBF is housed in a 16-lead narrow SOIC package (S package) with exposed pad thermal enhancement, rated for 0°C to 100°C operating ambient temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CCFL PGND (1) | CCFL switch emitter ground | High-current return path for CCFL switch; must be star-grounded separately from AGND |
| ICCFL (2) | Lamp current programming input | 0–100µA current input sets lamp current; internally regulated to 0.465V summing node |
| DIO (3) | Half-wave lamp current sense node | Connects to lamp low side in grounded config; conducts bidirectional lamp current for servo nulling |
| CCFL VC (4) | Current comparator input & loop compensation node | Voltage between 0.95V–2.0V sets CCFL switch turn-off threshold; capacitor to AGND provides single-pole compensation |
| AGND (5) | Analog reference ground | Low-noise return for reference, ICCFL summing, and feedback networks; isolated from power grounds |
| SHUTDOWN (6) | Active-low enable control | Pull ≤0.6V to disable regulator; reduces supply current to 35µA; 0.85V nominal threshold |
| NC (7) | No connect | Not bonded; leave unconnected per datasheet |
| NC (8) | No connect | Not bonded; leave unconnected per datasheet |
| CCFL VSW (16) | CCFL switch collector output | Drives Royer transformer primary; rated for ≥1.25A peak current and 60V breakdown |
| BULB (15) | Open-lamp protection sense input | Monitors BAT–BULB voltage; triggers clamp when >7.0V to prevent overvoltage during start-up or lamp failure |
| BAT (14) | Battery supply input | 4.5V–30V input for Royer bias and high-side current sense; 50µA quiescent draw |
| ROYER (13) | Royer center-tap sense input | In floating lamp config, used with BAT for primary-side current sensing; not present on LT1184 (only LT1184F) |
| VIN (12) | Main IC supply input | 3V–30V logic supply; powers internal LDO (2.4V); UVLO activates below 2.5V |
| REF (11) | 1.244V reference output | Low-impedance (5–30Ω) reference for external programming; usable for LCD contrast circuits |
| NC (10) | No connect | Not bonded; leave unconnected per datasheet |
| NC (9) | No connect | Not bonded; leave unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Grounded/floating lamp support | Enables flexible Royer transformer layout: DIO grounded for grounded lamp; DIO tied to AGND for floating lamp |
| Open-lamp protection | Bulb pin comparator clamps CCFL VC when BAT–Bulb >7.0V, preventing transformer saturation and overvoltage |
| Half-wave current sensing | DIO pin diverts 10% of negative half-cycle lamp current to CCFL VC, enabling accurate averaging with single capacitor |
| Integrated 200kHz oscillator | Eliminates external timing components; fixed frequency simplifies EMI filtering and magnetics design |
| Low-quiescent-current shutdown | 35µA shutdown current extends battery life in portable devices during display-off intervals |
Applications
| Notebook Display Backlight | Automotive Instrument Cluster |
|---|---|
Use Scenario: Driving CCFL backlights in 10–15 inch laptop LCD panels with variable brightness control. IC Role / Device Role / Timing Role: Primary CCFL current regulator implementing closed-loop lamp current control via ICCFL programming and DIO-based half-wave sensing. Use Value: Enables 0–100% dimming range with <±5% lamp current accuracy across temperature and input voltage, meeting ENERGY STAR® backlight efficiency requirements. | Use Scenario: Powering analog gauge and infotainment display backlights in vehicles with 12V battery systems and wide temperature operation. IC Role / Device Role / Timing Role: CCFL controller with open-lamp protection and floating lamp capability for robust operation under cold cranking (6V) and load dump (30V) conditions. Use Value: Maintains stable lamp current from –40°C to +105°C ambient and survives 40V transients via integrated 60V-rated CCFL VSW and Bulb protection. |
| Portable Medical Monitor | Retail Point-of-Sale Terminal |
Use Scenario: Providing flicker-free, EMI-controlled illumination for diagnostic-grade LCDs in handheld ultrasound and vital sign monitors. IC Role / Device Role / Timing Role: High-efficiency CCFL driver with 200kHz switching and single-pole loop compensation to suppress transformer overshoot during rapid brightness transitions. Use Value: Achieves >90% efficiency in floating CCFL configuration while meeting IEC 60601-1 leakage current and conducted emissions limits. | Use Scenario: Backlighting customer-facing LCDs in kiosks and payment terminals operating 24/7 with thermal constraints. IC Role / Device Role / Timing Role: CCFL regulator with thermal-aware shutdown and robust open-lamp detection to prevent field failures due to lamp aging or breakage. Use Value: Reduces service calls by detecting lamp end-of-life early via Bulb pin voltage drift, triggering graceful brightness reduction before complete failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1184CS#TRPBF | Same die but only supports grounded-lamp configuration; lacks ROYER pin and floating-lamp capability | Cannot implement floating-lamp Royer topology; limited to simpler, lower-cost grounded-lamp designs | Select LT1184FIS#TRPBF when floating-lamp layout or enhanced lamp protection is required |
| MAX16820ETE+ | Higher integration: includes boost converter, PWM dimming interface, and I²C control; 1.5A switch rating | Targets modern LED-backlit systems; requires different transformer and feedback architecture than CCFL | Choose MAX16820ETE+ only for new LED-based designs; not a drop-in replacement for CCFL |
Compared with LT1184CS#TRPBF and MAX16820ETE+, the LT1184FIS#TRPBF uniquely balances legacy CCFL compatibility, floating-lamp flexibility, and minimal external component count-making it optimal for cost-sensitive, thermally constrained portable CCFL backlight upgrades where Royer topology reuse is critical.
Availability
LT1184FIS#TRPBF is available at Aetrix Electronics and suitable for notebook display backlight, automotive instrument cluster, and portable medical monitor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1184FIS#TRPBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1184FIS#TRPBF belongs to Linear's CCFL/LCD Contrast Switching Regulator product line, engineered specifically for energy-efficient, reliable backlight power in portable and automotive displays with stringent EMI and thermal constraints.
FAQ
What is the maximum lamp current supported by the LT1184FIS#TRPBF?
The LT1184FIS#TRPBF supports up to 6mA CCFL lamp current, achieved by programming the ICCFL pin with 0–100µA input current. At 100µA ICCFL, the internal servo delivers ~6mA lamp current with ±5% accuracy across temperature and input voltage, verified in typical Royer transformer configurations per the datasheet.
Does the LT1184FIS#TRPBF support floating-lamp configurations?
Yes, the LT1184FIS#TRPBF explicitly supports floating-lamp configurations using the ROYER and BAT pins for primary-side current sensing. This capability distinguishes it from the LT1184CS#TRPBF and is confirmed in the device description, pin function table, and typical application schematics in the official datasheet.
What is the purpose of the DIO pin on the LT1184FIS#TRPBF?
The DIO pin on the LT1184FIS#TRPBF serves as the bidirectional current sense node for grounded-lamp configurations. It connects to the lamp's low side and routes 10% of the negative half-cycle lamp current to the CCFL VC pin, enabling precise half-wave averaging and stable current-mode control with minimal external components.
How does open-lamp protection work in the LT1184FIS#TRPBF?
Open-lamp protection in the LT1184FIS#TRPBF is implemented via the BULB pin, which monitors voltage between BAT and BULB. When this differential exceeds 7.0V (typ), the internal comparator pulls CCFL VC low, forcing the regulator into voltage-mode operation and limiting output to prevent transformer saturation and overvoltage damage during lamp failure or start-up.
Can the LT1184FIS#TRPBF be used with LED backlights instead of CCFL?
No, the LT1184FIS#TRPBF is specifically designed for CCFL lamp control and is not suitable for LED backlights. Its current programming architecture, DIO-based half-wave sensing, and Royer transformer interface are incompatible with constant-current LED drivers; use dedicated LED driver ICs such as the LT3466 or MAX16820 for LED applications.
LT1184FIS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, CCFL
- Voltage - Input:
- 3V ~ 30V
- Number of Outputs:
- 1
- Voltage - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1184FIS#TRPBF FAQ
1.How can I place an order for LT1184FIS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1184FIS#TRPBF 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 LT1184FIS#TRPBF reliable?
The price and inventory of LT1184FIS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1184FIS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1184FIS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1184FIS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1184FIS#TRPBF?
LT1184FIS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1184FIS#TRPBF 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 LT1184FIS#TRPBF?
For technical support, including LT1184FIS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1184FIS#TRPBF requirements.
6.How does Aetrix verify that LT1184FIS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1184FIS#TRPBF 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 LT1184FIS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1184FIS#TRPBF?
All LT1184FIS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1184FIS#TRPBF, 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 LT1184FIS#TRPBF part is unused and in its original packaging.
Return procedure for LT1184FIS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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