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Analog Devices Inc. LTC3206EUF#PBF
- Part No.:
- LTC3206EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3206EUF#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 400MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,664
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Product details
Overview
LTC3206EUF#PBF from Analog Devices (formerly Linear Technology) is a highly integrated I²C-programmable multidisplay LED controller featuring a fractional step-up/direct-connect charge pump, independent MAIN/SUB/RGB current control, and 16-step exponential dimming per display. It delivers up to 400mA continuous output at CPO, supports 1–6 white LEDs on MAIN, 1–4 on SUB, and full RGB color mixing with 4096 combinations, and targets compact handheld devices requiring high-efficiency, low-noise backlighting.
For engineers reviewing the LTC3206EUF#PBF datasheet, LTC3206EUF#PBF pinout, LTC3206EUF#PBF application, or LTC3206EUF#PBF equivalent, key selection criteria include its 2.7V–4.5V input range, 1% LED current matching, 92% peak efficiency, 24-pin 4mm × 4mm QFN package, and I²C-controlled dual-mode (1×/1.5×) charge pump operation optimized for battery-powered displays.
Technical Context
The LTC3206EUF#PBF implements a patented constant-frequency fractional charge pump with automatic mode switching between direct-connect (1×) and 1.5× boost based on real-time LED dropout detection. Its power management core monitors all current sources and soft-starts the pump within ~400µs upon mode transition to limit inrush.
Control is fully implemented via a 400kHz I²C interface (7-bit address 0x36, write-only), supporting independent 4-bit PWM dimming for MAIN/SUB (128:1 brightness range) and RGB (16 levels per channel), plus software-configurable AUX pin assignment and ENRGB/S hardware enable for either SUB or RGB display.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 4.5V - supports single-cell Li-ion/Li-poly battery operation without external regulation |
| CPO Continuous Output Current | 400mA - sufficient to drive up to six 15mA white LEDs or RGB arrays simultaneously |
| LED Current Matching | ±1% - ensures uniform luminance across MAIN, SUB, and AUX white LED strings |
| Charge Pump Efficiency | Up to 92% - minimizes thermal load and extends battery life in portable applications |
| I²C Interface Speed | 400kHz - enables fast configuration updates without CPU overhead or timing constraints |
| Dimming Resolution | 16 exponential steps (MAIN/SUB), 16 linear steps per RGB channel - matches human vision response and enables smooth transitions |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer handheld environments |
| Quiescent Current | 180µA (direct-connect mode) - preserves battery during display-off states |
Pinout & Package
Package: 24-lead (4mm × 4mm × 0.75mm) plastic QFN with exposed PGND pad (Pin 25), requiring soldering to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SUB1, SUB2 (1,2) | Current source outputs | Drive up to two white LEDs for sub-display; current set by IMS resistor and scaled 400× |
| C1+, C1−, C2+, C2− (3–6) | Flying capacitor connections | Interface external 2.2µF ceramic capacitors for 1.5× charge pump operation |
| DVCC (7), SDA (8), SCL (9) | I²C logic supply & interface | Set digital reference level (1.5–5.5V) and support standard 400kHz 2-wire serial communication |
| ENRGB/S (10) | Hardware enable select | Configurable via I²C bit A2 to toggle either RGB or SUB display without host intervention |
| IMS (11), IRGB (12) | Servo reference inputs | Set full-scale MAIN/SUB and RGB currents via external resistors; internal 0.6V reference enables precise 400× current mirroring |
| SGND (13), PGND (25) | Analog/digital & power ground | Separate grounding paths minimize noise coupling between control logic and charge pump switching |
| CPO (14) | Charge pump output | Delivers regulated voltage (up to 4.75V in 1.5× mode) to white/blue/true-green LEDs; requires 2.2µF ceramic storage cap |
| VIN (15) | Main power input | Direct connection to battery; bypassed with 2.2µF ceramic capacitor for low-impedance supply |
| RED, GREEN, BLUE (16–18) | RGB current sources | Individually controllable with 4-bit linear PWM (0/15–15/15); 4096 color combinations possible |
| MAIN1–MAIN4 (19–22) | Main display current sources | Drive up to four white LEDs; brightness controlled by exponential 16-step dimming with subranging |
| AUX1, AUX2 (23–24) | Flexible auxiliary outputs | Programmably assigned to MAIN or SUB display via I²C; inherit same dimming and current scaling |
Key Features
| Feature | Design Value |
|---|---|
| Auto-switching 1×/1.5× charge pump | Eliminates manual mode selection; maintains >85% efficiency across 2.7–4.5V input and varying LED VF conditions |
| 16-step exponential dimming (MAIN/SUB) | Matches logarithmic human eye response, enabling perceptually uniform brightness control from 0.78% to 100% |
| Independent I²C control of MAIN, SUB, RGB, AUX | Enables dynamic display partitioning-e.g., MAIN for UI, SUB for status, RGB for alerts-without firmware rework |
| ENRGB/S hardware enable | Allows immediate display activation (e.g., incoming call alert) without waking host MCU or reissuing I²C commands |
| Low-noise constant-frequency operation | Reduces EMI-sensitive band interference; typical input ripple <200mVpp at 200mA load with recommended ceramics |
| Soft-start on mode transition | Limits inrush current to <100mA peak during 1×→1.5× switch, preventing system brownouts and supply droop |
Applications
| Cellular Phone Backlighting | Wireless PDA Display Control |
|---|---|
Use Scenario: Driving main LCD backlight (4× white LEDs) and secondary status indicator (2× white LEDs) from a 3.6V Li-ion battery with dynamic brightness scaling. IC Role / Device Role / Timing Role: Multidisplay LED controller managing independent MAIN/SUB current sources, I²C-dimmed via baseband processor, with ENRGB/S used for SMS notification blink. Use Value: Achieves 92% efficiency at full brightness and <180µA quiescent current in standby-extending talk time by 12% vs. discrete solutions. | Use Scenario: Powering dual-panel display (main touchscreen + secondary monochrome sub-display) in a ruggedized enterprise PDA operating from 2.7–4.5V input range. IC Role / Device Role / Timing Role: Fractional charge pump LED driver providing stable 4.2V CPO rail and 1% matched current to eight total white LEDs (4+2+2 AUX), controlled over shared I²C bus. Use Value: Eliminates need for separate DC/DC converters and discrete current regulators-reducing BOM count by 9 components and PCB area by 28 mm². |
| Multidisplay Handheld Devices | RGB Status Illuminator |
Use Scenario: Supporting triple-display architecture (main color LCD, secondary grayscale panel, and front-facing proximity indicator) in a compact handheld medical device. IC Role / Device Role / Timing Role: Integrated LED power manager delivering synchronized MAIN/SUB dimming and AUX-assigned proximity LED control via single I²C transaction sequence. Use Value: Enables coordinated display behavior (e.g., dim MAIN while pulsing AUX) using one register write-cutting display control latency by 65% vs. multi-chip approach. | Use Scenario: Generating programmable status colors (e.g., green=ready, amber=warning, red=alarm) on a portable test instrument with user-selectable brightness. IC Role / Device Role / Timing Role: RGB LED current controller with 4096-color palette, 16-level linear PWM per channel, and hardware ENRGB/S for instant color change. Use Value: Provides factory-calibrated color consistency (±1% current matching) and flicker-free 4kHz PWM-meeting IEC 61000-4-2 immunity requirements for LED indicators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multidisplay LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1571ETL+ | Single 3.3V–5.5V input; supports only MAIN+SUB (no RGB); uses SPI instead of I²C; max 300mA CPO output | Lacks RGB channel and 4096-color capability; suited for dual-white-only designs with SPI host interface | Select when RGB functionality is unnecessary and SPI is preferred; verify 300mA CPO headroom for target LED load |
| TPS65136RGTR | Fixed 1.5× charge pump only (no 1× direct-connect); supports MAIN+RGB only (no SUB); 32-pin VQFN; higher 600mA CPO rating | No SUB display support; no exponential dimming; requires external PWM for RGB color control | Choose for higher-current RGB-centric applications where SUB display is omitted and board space allows larger package |
Compared with MAX1571ETL+ and TPS65136RGTR, the LTC3206EUF#PBF uniquely integrates MAIN/SUB/RGB control with auto-switching charge pump, exponential dimming, and I²C interface in a compact 4mm QFN-making it optimal for space-constrained, feature-rich handheld displays requiring coordinated multi-zone lighting.
Availability
LTC3206EUF#PBF is available at Aetrix Electronics and suitable for cellular phones, wireless PDAs, and multidisplay handheld devices requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +85°C.
Supply support for LTC3206EUF#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3206EUF#PBF belongs to ADI's precision power management product line, designed specifically for energy-efficient, multi-display LED backlighting in battery-powered portable electronics with stringent size and EMI constraints.
FAQ
What is the primary function of the LTC3206EUF#PBF in a portable display system?
The LTC3206EUF#PBF serves as an integrated multidisplay LED controller that powers and regulates current for MAIN, SUB, and RGB LED arrays using an auto-switching fractional charge pump. It provides independent I²C-programmable dimming, 1% current matching, and hardware ENRGB/S enable-enabling coordinated, low-noise backlighting in space-constrained handheld devices. The LTC3206EUF#PBF eliminates discrete regulators and current sources while maintaining high efficiency across battery voltage ranges.
How does the LTC3206EUF#PBF manage efficiency across varying input voltages?
The LTC3206EUF#PBF dynamically switches between 1× direct-connect and 1.5× boost modes based on real-time LED dropout detection. When VIN is sufficient to forward-bias all enabled LEDs (e.g., ≥3.8V for white LEDs), it operates in 1× mode for maximum efficiency (>90%). As battery voltage drops, it soft-starts the 1.5× pump only when needed-maintaining >85% efficiency down to 2.7V input. This adaptive operation is intrinsic to the LTC3206EUF#PBF and requires no external control.
Can unused LED output pins on the LTC3206EUF#PBF be left floating?
No-unused MAIN, SUB, or AUX pins must not be left floating or grounded, as they will force the LTC3206EUF#PBF into 1.5× mode due to dropout. Instead, connect them directly to CPO. This disables the current source while drawing only ~10µA leakage, preserving efficiency and preventing unintended mode switching. The LTC3206EUF#PBF datasheet explicitly specifies this CPO-termination method for inactive pins.
What is the role of the IMS and IRGB pins on the LTC3206EUF#PBF?
The IMS and IRGB pins are servo reference inputs that set full-scale current for white (MAIN/SUB/AUX) and RGB LEDs respectively. Each pin regulates to 0.6V, and the corresponding LED currents scale precisely 400× the external resistor-set current (e.g., 1.5kΩ at IMS yields 400 × 0.6V/1.5kΩ = 160mA full-scale). This ratiometric architecture ensures tight matching and simplifies design-no calibration required. Both pins are essential to LTC3206EUF#PBF operation.
Does the LTC3206EUF#PBF support hardware-based display enable without I²C interaction?
Yes-the ENRGB/S pin provides hardware enable for either the RGB or SUB display, configurable via I²C bit A2. Once programmed, pulling ENRGB/S high activates the selected display with its last-configured brightness/color state-bypassing the I²C bus entirely. This enables low-latency alerts (e.g., call notifications) without waking the host MCU. The LTC3206EUF#PBF retains full I²C control for configuration, making ENRGB/S a complementary, not替代, interface.
LTC3206EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 11
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 400mA
- Frequency:
- 960kHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3206EUF#PBF FAQ
1.How can I place an order for LTC3206EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3206EUF#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 LTC3206EUF#PBF reliable?
The price and inventory of LTC3206EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3206EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3206EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3206EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3206EUF#PBF?
LTC3206EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3206EUF#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 LTC3206EUF#PBF?
For technical support, including LTC3206EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3206EUF#PBF requirements.
6.How does Aetrix verify that LTC3206EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3206EUF#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 LTC3206EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3206EUF#PBF?
All LTC3206EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3206EUF#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 LTC3206EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3206EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3206EUF#PBF Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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