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Analog Devices Inc. LT1184FCS#TRPBF
- Part No.:
- LT1184FCS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1184FCS#TRPBF.pdf
- Description:
- IC REG CONV CCFL 1OUT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,296
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Product details
Overview
LT1184FCS#TRPBF from Analog Devices (formerly Linear Technology) is a dedicated CCFL backlight switching regulator IC for cold cathode fluorescent lamp control in portable displays. It features 1.25A CCFL switch current, 200kHz switching frequency, 3V–30V input range, grounded/floating lamp configuration support, and open-lamp protection - enabling high-efficiency, compact CCFL inverters in notebook computers and automotive displays.
For engineers reviewing the LT1184FCS#TRPBF datasheet, LT1184FCS#TRPBF pinout, LT1184FCS#TRPBF application, or LT1184FCS#TRPBF equivalent, key selection criteria include CCFL switch current limit (1.25A typ), ICCFL programming interface (0–100µA), REF pin availability for lamp current calibration, shutdown threshold (0.85V), and SO-16 package thermal performance (θJA = 100°C/W).
Technical Context
The LT1184FCS#TRPBF implements current-mode switching regulation with cycle-by-cycle current limiting and internal slope compensation to ensure stability at duty cycles up to 85%. Its CCFL control loop uses a high-side sense servo (1.00A typ at ICCFL = 100µA) referenced to BAT and Royer pins, enabling precise lamp current regulation independent of transformer variations.
Unlike the LT1182/LT1183, the LT1184FCS#TRPBF omits LCD contrast functionality and instead exposes the REF pin (1.244V typ) for direct lamp current programming calibration. It supports both grounded and floating lamp topologies via DIO pin configuration and integrates open-lamp protection through the Bulb–BAT comparator (7.0V typ clamp voltage).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CCFL Switch Current Limit | 1.25A typical at 50% duty cycle - sets maximum lamp drive capability without external sensing resistors |
| Switching Frequency | 200kHz typical - enables compact magnetics (e.g., <100µH Royer inductors) and reduces EMI fundamental |
| Input Voltage Range | 3V to 30V - supports wide battery input (e.g., 3.3V logic supply or 24V industrial bus) |
| ICCFL Programming Range | 0µA to 100µA - linearly controls lamp current from off to full scale (e.g., 0–6mA bulb current) |
| Reference Voltage (REF) | 1.244V ±20mV - stable, low-impedance (5–30Ω) reference for external lamp current calibration circuits |
| Shutdown Supply Current | 35µA typical - enables ultra-low-power standby in battery-operated devices |
| CCFL VSW Breakdown Voltage | 60V minimum - supports Royer transformer secondaries delivering >300VAC lamp drive |
Pinout & Package
LT1184FCS#TRPBF is housed in a 16-lead narrow SOIC (SO-16) package with θJA = 100°C/W, optimized for surface-mount assembly and thermal management in space-constrained display modules.
| 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 to avoid noise coupling |
| ICCFL (2) | Lamp current programming input | Sinks 0–100µA to set regulated lamp current; internally regulated to 465mV summing node |
| DIO (3) | Grounded/floating lamp interface | Connects to lamp low side in grounded config; tie to GND in floating config to enable Royer primary sensing |
| CCFL VC (4) | Current error amplifier output | High-impedance node (0.95–2.0V) setting CCFL switch turn-off threshold; accepts RC compensation |
| AGND (5) | Analog reference ground | Low-noise return for REF, ICCFL, and internal 1.24V reference; must be isolated from power grounds |
| SHUTDOWN (6) | Active-low enable control | Pull ≤0.85V to disable CCFL regulation; reduces supply current to 35µA; float or pull high to enable |
| NC (7) | No connect | Not bonded; leave unconnected per datasheet - no routing or grounding required |
| NC (8) | No connect | Not bonded; leave unconnected per datasheet - no routing or grounding required |
| CCFL VSW (16) | CCFL switch collector | Drives Royer transformer primary; rated for 60V breakdown and 1.25A continuous current |
| BULB (15) | Open-lamp protection sense | Monitors Royer center-tap voltage vs BAT; triggers voltage-mode clamp at 7.0V to prevent overvoltage during lamp failure |
| BAT (14) | Royer bias and current sense | Supplies Royer circuitry; forms high-side current sense pair with Royer pin (0.1Ω internal resistor) |
| ROYER (13) | Royer primary current sense | Inverting input of Royer current amplifier; used only in floating lamp config with BAT pin |
| VIN (12) | Main IC supply input | Accepts 3–30V; powers internal LDO (2.4V); quiescent current rises ~20mA/A under switch load |
| REF (11) | Internal voltage reference output | 1.244V ±20mV, 5–30Ω output impedance - enables precision external lamp current calibration |
| NC (10) | No connect | Not bonded; leave unconnected per datasheet - no routing or grounding required |
| NC (9) | No connect | Not bonded; leave unconnected per datasheet - no routing or grounding required |
Key Features
| Feature | Design Value |
|---|---|
| Grounded or floating lamp support | Configurable via DIO pin connection - eliminates need for separate IC variants for different display architectures |
| Open-lamp protection | Integrated Bulb–BAT comparator clamps CCFL VC at 7.0V during lamp removal or failure - prevents transformer saturation and overvoltage |
| REF pin for lamp current calibration | 1.244V reference with 5–30Ω output impedance enables accurate external DAC or resistor-divider programming of lamp brightness |
| 200kHz fixed-frequency operation | Enables use of small, low-cost ferrite-core Royer transformers (e.g., CTX02-12403) while maintaining EMI compliance |
| 1.25A CCFL switch with quasi-saturation drive | Forced beta ~50 ensures fast switching (sub-µs on/off) and <1.0Ω on-resistance - minimizes conduction loss in portable applications |
Applications
| Notebook Display Backlight | Automotive Instrument Cluster |
|---|---|
Use Scenario: Driving 4–6mA CCFL tubes in 10–15" laptop LCD panels with dynamic brightness control via PWM or DAC. IC Role / Device Role / Timing Role: Primary CCFL current regulator using Royer topology; provides lamp current feedback via ICCFL pin and open-lamp safety via Bulb pin. Use Value: Enables >90% efficient floating CCFL configuration with single-chip integration of oscillator, reference, protection, and 1.25A switch - reducing BOM count by ≥4 discrete components vs discrete solutions. | Use Scenario: Powering analog gauge backlighting in automotive dashboards requiring AEC-Q200-compliant operation across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: CCFL controller with robust open-lamp detection and wide input (6–24V battery range) - operates reliably during cold cranking (6V) and load dump (30V). Use Value: Integrated 7.0V Bulb–BAT clamp and 100°C junction rating allow direct connection to vehicle battery without external TVS or regulators - simplifying front-end design. |
| Portable Medical Monitor | Retail Point-of-Sale Terminal |
Use Scenario: Illuminating high-contrast LCDs in handheld ultrasound or patient monitors where EMI must be minimized near sensitive analog circuits. IC Role / Device Role / Timing Role: Fixed-frequency (200kHz) CCFL driver with star-grounded AGND/PGND separation - isolates switching noise from analog sensor signal paths. Use Value: Low 35µA shutdown current and precise 0–100µA ICCFL programming enable battery life extension and fine-grained brightness control without microcontroller overhead. | Use Scenario: Backlighting customer-facing LCDs in kiosks and payment terminals operating 24/7 in commercial environments. IC Role / Device Role / Timing Role: CCFL regulator with thermal-aware design (θJA = 100°C/W) and 100°C max operating ambient - sustains reliability in enclosed, fanless enclosures. Use Value: SO-16 package and integrated slope compensation eliminate need for external compensation components - reducing layout area and qualification effort for long-lifecycle products. |
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 pinout and electrical specs, but supports grounded-lamp configuration only (no Royer/BAT floating-lamp sensing) | Requires external current sense for floating lamps; unsuitable for designs needing Royer primary-side sensing | Select LT1184FCS#TRPBF when floating-lamp topology or Royer-based current sensing is required |
| MAX16820ATL+ | Higher 2.5A CCFL switch current; 1MHz switching; requires external MOSFET; no integrated Royer driver | Designed for high-brightness industrial CCFLs; lacks integrated open-lamp protection and REF pin | Choose MAX16820ATL+ only for >6mA lamp current or >1MHz EMI requirements - adds complexity and cost |
Compared with LT1184CS#TRPBF, LT1184FCS#TRPBF adds Royer/BAT current sensing for floating lamps and retains REF pin calibration; versus MAX16820ATL+, it offers lower system cost and simpler layout due to integrated switch and protection, albeit with lower max current and fixed 200kHz frequency.
Availability
LT1184FCS#TRPBF is available at Aetrix Electronics and suitable for notebook display backlighting, automotive instrument clusters, portable medical monitors, and retail point-of-sale terminals requiring stable component supply across extended product lifecycles.
Supply support for LT1184FCS#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, serving industrial, automotive, communications, and healthcare markets.
The LT1184FCS#TRPBF belongs to Linear's legacy CCFL/LCD backlight regulator family, engineered specifically for high-reliability, low-noise portable display power systems with integrated protection and minimal external components.
FAQ
What is the function of the REF pin on the LT1184FCS#TRPBF?
The REF pin on the LT1184FCS#TRPBF outputs a precision 1.244V ±20mV reference with low output impedance (5–30Ω), enabling accurate external calibration of lamp current via resistor dividers or DACs. Unlike the LT1184CS#TRPBF, the LT1184FCS#TRPBF retains this pin to support programmable brightness in both grounded and floating lamp configurations - critical for factory trim and closed-loop brightness control.
Can the LT1184FCS#TRPBF drive a floating-lamp CCFL configuration?
Yes, the LT1184FCS#TRPBF supports floating-lamp operation using the BAT and Royer pins as a high-side current sense pair (0.1Ω internal resistor). When DIO is grounded, the IC senses Royer primary current to regulate lamp current - eliminating the need for secondary-side current transformers. This capability distinguishes it from the LT1184CS#TRPBF and is confirmed in the datasheet's "Floating Lamp Configuration" section and pin function table.
What is the maximum lamp current achievable with the LT1184FCS#TRPBF?
The LT1184FCS#TRPBF regulates lamp current via the ICCFL pin (0–100µA input), which scales to 0–6mA bulb current in typical designs. Its 1.25A CCFL switch current limit and 60V VSW rating support lamps requiring up to ~6mA RMS current - verified by the "Typical Application" circuit (LT1182/3 TA01) and performance curves showing 6mA lamp current at 100µA ICCFL.
How does open-lamp protection work on the LT1184FCS#TRPBF?
Open-lamp protection on the LT1184FCS#TRPBF uses an internal comparator between the Bulb and BAT pins, triggering at 7.0V typical. During lamp removal or failure, rising Royer center-tap voltage pulls CCFL VC low, forcing the regulator into voltage-mode operation and halting switching - preventing transformer core saturation and output overvoltage. This behavior is documented in the "Bulb Protect Servo Voltage" specification and "PIN FUNCTIONS" section.
What is the recommended PCB layout practice for the LT1184FCS#TRPBF?
Linear Technology recommends star-ground layout for the LT1184FCS#TRPBF: separate AGND (low-current analog reference) and CCFL PGND (high-current switch return) traces, joined at a single point near the IC. Feedback dividers and compensation capacitors must connect directly to AGND; high di/dt paths (CCFL VSW, CCFL PGND) should avoid AGND routing. This minimizes noise coupling and ensures stable regulation - explicitly stated in the "PIN FUNCTIONS" section for Pins 1 and 5.
LT1184FCS#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:
- 0°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1184FCS#TRPBF FAQ
1.How can I place an order for LT1184FCS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1184FCS#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 LT1184FCS#TRPBF reliable?
The price and inventory of LT1184FCS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1184FCS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1184FCS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1184FCS#TRPBF transactions.
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4.How is shipping managed for LT1184FCS#TRPBF?
LT1184FCS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1184FCS#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 LT1184FCS#TRPBF?
For technical support, including LT1184FCS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1184FCS#TRPBF requirements.
6.How does Aetrix verify that LT1184FCS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1184FCS#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 LT1184FCS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1184FCS#TRPBF?
All LT1184FCS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1184FCS#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 LT1184FCS#TRPBF part is unused and in its original packaging.
Return procedure for LT1184FCS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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