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Analog Devices Inc. LT1182IS#TRPBF
- Part No.:
- LT1182IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1182IS#TRPBF.pdf
- Description:
- IC REG CONV CCFL/LCD 1OUT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,382
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Product details
Overview
LT1182IS#TRPBF from Analog Devices (formerly Linear Technology) is a dual current-mode switching regulator IC designed for CCFL backlight and dual-polarity LCD contrast control in portable displays. It supports 3V–30V input, delivers 1.25A CCFL switch current and 625mA LCD switch current, operates at 200kHz, and enables grounded or floating lamp configurations with open-lamp protection.
For engineers reviewing the LT1182IS#TRPBF datasheet, LT1182IS#TRPBF pinout, LT1182IS#TRPBF application, or LT1182IS#TRPBF equivalent, key selection criteria include dual-regulator architecture, ±10V to ±30V programmable contrast range, 0.45V ICCFL summing voltage reference, high-side sense servo accuracy (±7% over temperature), and compatibility with Royer transformer topologies in notebook and automotive display power supplies.
Technical Context
The LT1182IS#TRPBF integrates two independent current-mode regulators: one for CCFL lamp current control (via ICCFL programming and DIO-based half-wave sensing) and one for LCD contrast voltage generation (using FBP/FBN differential error amplifiers). Each employs cycle-by-cycle current limiting and internal slope compensation for stable operation up to 85% duty cycle.
Its analog architecture features separate AGND and PGND pins, high-impedance VC pins (CCFL VC and LCD VC) for loop compensation and clamping, and dedicated BAT/Royer sensing for floating-lamp primary-side current monitoring - enabling precise lamp current regulation without secondary-side feedback components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V - supports wide battery and adapter inputs without external pre-regulation. |
| CCFL Switch Current Limit | 1.25A at 50% duty cycle - sufficient to drive typical CCFL lamps up to 6mA with margin. |
| LCD Switch Current Limit | 625mA at 50% duty cycle - enables direct contrast voltage generation for segment or TFT bias rails. |
| Switching Frequency | 200kHz typical - minimizes size of magnetic components (e.g., Royer transformers) while avoiding audible noise. |
| ICCFL Summing Voltage | 0.45V ±0.04V - fixed reference for accurate lamp current programming via external DAC or PWM filter. |
| Quiescent Supply Current | 9mA typical - low standby draw critical for battery-powered palmtop and notebook applications. |
| Shutdown Current | 35µA typical - enables deep sleep mode during display off periods without external circuitry. |
| Operating Temperature | 0°C to 100°C ambient - validated for industrial and automotive display environments. |
Pinout & Package
LT1182IS#TRPBF is housed in a 16-lead narrow SOIC package (S package) with exposed pad for thermal performance. Pin assignments are fully defined per Linear Technology's official pinout diagram for the LT1182 family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CCFL PGND (1) | CCFL switch emitter | Provides high-current return path and internal current-sense reference for CCFL regulator. |
| ICCFL (2) | Lamp current programming input | 0–100µA current input sets lamp current; internally regulated to 0.45V summing node. |
| DIO (3) | Grounded-lamp cathode/anode interface | Half-wave rectifies lamp current; enables current sensing without secondary winding. |
| CCFL VC (4) | CCFL current comparator input & loop compensation node | Voltage-controlled trip point (0.95–2.0V); single capacitor provides stable single-pole compensation. |
| AGND (5) | Analog ground reference | Low-noise return for reference, error amps, and ICCFL summing - must be star-connected. |
| SHUTDOWN (6) | Active-low enable | Pull ≤0.6V to disable both regulators; reduces supply current to 35µA. |
| LCD VC (7) | LCD contrast error amplifier output | Controls LCD switch turn-off threshold; clamped externally for adjustable contrast range. |
| LCD PGND (8) | LCD switch emitter | High-current return for LCD contrast switch; isolated from CCFL PGND to prevent coupling. |
| LCD VSW (9) | LCD switch collector | Drives LCD contrast transformer or resistive divider; rated for 625mA continuous. |
| FBN (10) | Negative contrast error amp non-inverting input | Accepts negative contrast reference; offset by –12mV to define startup state. |
| FBP (11) | Positive contrast error amp inverting input | Sums with FBN to generate differential contrast control signal. |
| VIN (12) | Main supply input | 3–30V logic/system rail; powers internal LDO (2.4V) and control circuitry. |
| Royer (13) | Royer converter center-tap sense | Used with BAT pin for floating-lamp primary-side current sensing - not present on LT1184. |
| BAT (14) | Battery/primary-side supply | 4.5–30V input for Royer and LCD converters; provides bias for high-side sense amplifier. |
| Bulb (15) | Open-lamp protection comparator input | Monitors BAT–Bulb voltage; triggers clamp when >7.0V to prevent transformer overvoltage. |
| CCFL VSW (16) | CCFL switch collector | Drives CCFL Royer primary; rated for 1.25A peak and 60V breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Separate CCFL and LCD control loops eliminate cross-coupling and allow simultaneous optimization. |
| Grounded/floating lamp support | Configurable via DIO and Royer/BAT pin usage - accommodates diverse display mechanical layouts. |
| Open-lamp protection | Integrated Bulb–BAT comparator limits Royer output voltage to 7.5V max, preventing transformer stress. |
| Dual-polarity LCD contrast | FBN/FBP differential inputs enable programmable ±10V to ±30V contrast range without external op-amps. |
| Current-mode control with slope compensation | Stable operation up to 85% duty cycle; eliminates need for external compensation networks. |
| High-side current sensing (BAT/Royer) | 0.1Ω internal sense resistor translates 0–1A primary current to 0–100mV, enabling floating-lamp control. |
Applications
| Notebook Display Backlight | Automotive Instrument Cluster |
|---|---|
Use Scenario: Driving CCFL tubes in 10–15-inch laptop displays with dynamic brightness control. IC Role / Device Role / Timing Role: Primary CCFL regulator and LCD contrast controller in integrated display power management IC. Use Value: Enables 90% efficient floating CCFL configuration with variable positive/negative contrast from 10V to 30V using a single IC. | Use Scenario: Powering analog gauges and segmented LCDs in vehicle dashboards under wide temperature and input voltage variation. IC Role / Device Role / Timing Role: Dual-output DC-DC controller providing isolated lamp drive and programmable contrast bias for cold-start operation. Use Value: Maintains stable lamp current across –40°C to +105°C ambient via temperature-compensated ICCFL summing voltage (±0.04V drift). |
| Portable Medical Monitor | Retail Point-of-Sale Terminal |
Use Scenario: Backlighting high-reliability monochrome LCDs in handheld diagnostic devices with battery life constraints. IC Role / Device Role / Timing Role: Low-quiescent-current (9mA) CCFL/LCD controller supporting shutdown mode (35µA) for extended idle periods. Use Value: Reduces system standby power by >99% versus discrete solutions while preserving fast wake-up response. | Use Scenario: Driving CCFL backlights in kiosk and self-checkout displays operating continuously in commercial environments. IC Role / Device Role / Timing Role: Robust CCFL regulator with open-lamp protection and 100°C junction temperature rating. Use Value: Prevents Royer transformer overvoltage during lamp aging or failure, extending field service life beyond 50,000 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL/LCD contrast regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1183IS#TRPBF | Includes exposed REF pin (1.244V) for simplified lamp current programming; no FBN/FBP dual contrast inputs. | Optimized for unipolar LCD contrast only; lacks negative contrast capability of LT1182IS#TRPBF. | Select when only positive-only contrast control is required and REF pin access simplifies DAC interfacing. |
| LT1184FIS#TRPBF | CCFL-only regulator (no LCD section); supports grounded/floating lamp but omits LCD VSW, FBP, FBN, LCD VC pins. | Reduces BOM count in designs requiring CCFL drive only; no contrast voltage generation capability. | Select when display uses separate contrast IC or passive bias networks, prioritizing footprint and cost reduction. |
Compared with LT1183IS#TRPBF and LT1184FIS#TRPBF, LT1182IS#TRPBF uniquely integrates full dual-polarity LCD contrast control alongside CCFL regulation - eliminating need for external op-amps or second ICs in space-constrained portable displays.
Availability
LT1182IS#TRPBF is available at Aetrix Electronics and suitable for notebook display backlighting, automotive instrument clusters, and portable medical monitors requiring stable component supply with long-term lifecycle assurance.
Supply support for LT1182IS#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT1182 family.
The LT1182IS#TRPBF belongs to Linear Technology's CCFL/LCD Contrast Switching Regulator product line, engineered specifically for high-efficiency, low-noise display power management in battery-operated and thermally constrained systems.
FAQ
What is the maximum lamp current that LT1182IS#TRPBF can regulate?
LT1182IS#TRPBF regulates CCFL lamp current up to 6mA typical, corresponding to an ICCFL programming current of 0–50µA. Its internal CCFL switch supports 1.25A peak current, enabling reliable drive of lamps requiring up to 6mA with margin for aging and temperature drift. The actual lamp current is set by external resistor networks and the 0.45V ICCFL summing voltage reference.
How does LT1182IS#TRPBF implement open-lamp protection?
LT1182IS#TRPBF implements open-lamp protection via the Bulb pin, which forms a 7.0V threshold comparator with the BAT pin. When the voltage difference exceeds 7.5V (e.g., during lamp removal or failure), the comparator sinks current into the CCFL VC pin, forcing the regulator into voltage-mode operation and clamping output to prevent Royer transformer overvoltage - protecting both the IC and magnetics.
Can LT1182IS#TRPBF drive both grounded and floating CCFL lamp configurations?
Yes, LT1182IS#TRPBF supports both grounded and floating lamp configurations. For grounded lamps, DIO connects to lamp cathode/anode and Royer ties to BAT. For floating lamps, DIO is grounded and Royer/BAT sense primary-side current - enabling lamp current control without secondary-side feedback components in either topology.
What is the function of the FBP and FBN pins on LT1182IS#TRPBF?
The FBP and FBN pins on LT1182IS#TRPBF form a differential input pair for the LCD contrast error amplifier. FBP serves as the inverting input and FBN as the non-inverting input with –12mV internal offset, enabling programmable positive or negative contrast voltage generation from ±10V to ±30V - a capability not found in LT1183 or LT1184 variants.
Does LT1182IS#TRPBF require external compensation components for stable operation?
No, LT1182IS#TRPBF achieves stable current-mode operation with minimal external components: a single capacitor on CCFL VC or LCD VC provides full loop compensation. Its internal slope compensation and single-pole response eliminate need for complex RC networks - reducing BOM count and layout sensitivity compared to voltage-mode alternatives.
LT1182IS#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, LCD
- 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
LT1182IS#TRPBF FAQ
1.How can I place an order for LT1182IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1182IS#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 LT1182IS#TRPBF reliable?
The price and inventory of LT1182IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1182IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1182IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1182IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1182IS#TRPBF?
LT1182IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1182IS#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 LT1182IS#TRPBF?
For technical support, including LT1182IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1182IS#TRPBF requirements.
6.How does Aetrix verify that LT1182IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1182IS#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 LT1182IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1182IS#TRPBF?
All LT1182IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1182IS#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 LT1182IS#TRPBF part is unused and in its original packaging.
Return procedure for LT1182IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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