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Analog Devices Inc. LTC3209EUF-2#PBF
- Part No.:
- LTC3209EUF-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3209EUF-2#PBF.pdf
- Description:
- IC LED DRV RGLTR I2C 600MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,434
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Product details
Overview
LTC3209EUF-2#PBF from Analog Devices (formerly Linear Technology) is a highly integrated multimode charge pump LED controller optimized for dual-camera mobile applications. It delivers up to 200mA per CAM channel (2 × 200mA), 5 × 25mA MAIN display current, and 15mA AUX current, with I²C-programmable dimming across 256/16/4 brightness states respectively. Its automatic 1x/1.5x/2x mode switching maintains efficiency up to 94% while powering white LEDs in QVGA+ camera phones.
For engineers reviewing the LTC3209EUF-2#PBF datasheet, LTC3209EUF-2#PBF pinout, LTC3209EUF-2#PBF application, or LTC3209EUF-2#PBF equivalent, key selection considerations include its 20-pin 4mm × 4mm QFN package, dual-CAM current source architecture, 850kHz fixed-frequency charge pump, thermal/short-circuit protection, and I²C-controlled 4-bit CAM DAC resolution with CAMHL pin for fast high/low register switching.
Technical Context
The LTC3209EUF-2#PBF implements a 2-phase nonoverlapping 850kHz switched-capacitor charge pump with automatic dropout-based mode transitions: 1x (direct VBAT pass-through), 1.5x (4.6V regulated), and 2x (5.1V regulated). Mode reset occurs on I²C data update or CAMHL falling edge.
It integrates five independent 8-bit MAIN current sources (0–28mA), two 4-bit CAM current sources (0–200mA each), and one 2-bit AUX source (0–13.75mA), all referenced to a single RREF resistor (24.3kΩ typical). Dropout detection triggers mode switching only after 150ms (or 2ms if DROP2MS bit set or CAMHL asserted).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Pump Modes | 1x (VBAT → CPO), 1.5x (4.6V regulated), 2x (5.1V regulated); auto-switched on LED dropout |
| CAM Output Capability | 2 × 200mA max (per channel), 4-bit linear DAC, 16 brightness levels per channel |
| MAIN Output Capability | 5 × 25mA max (per channel), 8-bit linear DAC, 256 brightness levels per channel |
| AUX Output Capability | 1 × 15mA max, 2-bit linear DAC, 4 brightness states (OFF/33%/67%/100%) |
| I²C Interface | Standard 2-wire interface (SCL/SDA), 400kHz max clock, DVCC-referenced logic (1.5–4.5V) |
| Operating Voltage Range | VBAT: 2.9–4.5V; DVCC: 1.5–4.5V; supports battery-powered mobile systems |
| Package | 20-lead 4mm × 4mm plastic QFN with exposed GND pad (pin 21) |
Pinout & Package
20-lead (4mm × 4mm) plastic QFN package with exposed thermal pad (pin 21 = GND). Requires soldering exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPO (Pin 1) | Charge pump output | Supplies regulated voltage (up to 5.1V) to all LED anodes; requires 2.2µF ceramic capacitor to GND |
| MAIN1–5 (Pins 2–6) | Main display current sinks | Each provides programmable 0–28mA sink current for white LEDs; disabled by writing 0 to REGA |
| AUX (Pin 7) | Auxiliary current sink | Provides 0–13.75mA sink with 2-bit control; no dropout sensing; usable as I²C-controlled open-drain output |
| VBAT2, VBAT1 (Pins 8, 18) | Power supply inputs | Dual VBAT pins isolate charge pump noise from analog/digital sections; both must connect externally and bypass |
| RREF (Pin 9) | Reference current setting | 1.23V internal reference; 24.3kΩ to GND sets full-scale currents for MAIN/CAM/AUX |
| DVCC (Pin 10) | Digital supply rail | Sets logic threshold for SDA/SCL/CAMHL; includes UVLO (1V threshold); decouple with 0.1µF |
| CAM1, CAM2 (Pins 11, 12) | Camera LED current sinks | Independent 0–200mA sinks per channel; 4-bit DAC control; disable via REGB = 0 or connect to CPO |
| CAMHL (Pin 13) | Camera register select | High = select CAM high-current register; low = select CAM low-current register; falling edge resets to 1x mode |
| SDA (Pin 14) | I²C data line | Open-drain bidirectional data line referenced to DVCC; requires external pull-up |
| SCL (Pin 15) | I²C clock line | Input-only clock line referenced to DVCC; requires external pull-up |
| C1P, C1M, C2P, C2M (Pins 16–17, 19–20) | Flying capacitor connections | Two 2.2µF ceramic capacitors required (C1P–C1M and C2P–C2M) for charge pump operation |
| Exposed Pad (Pin 21) | Thermal & electrical ground | Mandatory connection to PCB ground plane for thermal dissipation and signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Auto-switching multimode charge pump | Enables >94% efficiency across varying LED forward voltages without manual mode selection |
| Dual independent CAM current sources | Supports separate high/low flash modes (e.g., preview vs. capture) with sub-2ms mode transition via CAMHL |
| Integrated soft-start | Linearly ramps CPO current over ~125µs during 1.5x/2x transitions, preventing input droop and inrush stress |
| Comprehensive fault protection | Includes short-circuit, thermal shutdown (~150°C), open-short LED detection, and RREF short-circuit tolerance |
| Flexible I²C control architecture | Three dedicated registers (REGA, REGB, REGC) enable simultaneous MAIN/CAM/AUX programming and mode forcing |
Applications
| Smartphone Dual-Camera Flash | QVGA+ Camera Phone Display Backlight |
|---|---|
|
Use Scenario: Simultaneous illumination of primary and secondary cameras during video capture or burst photography. IC Role / Device Role / Timing Role: Dual 200mA CAM current sources deliver synchronized flash pulses with independent brightness control via CAMHL pin. Use Value: Enables hardware-fast switching between preview (low-current) and capture (high-current) modes without I²C reconfiguration latency. |
Use Scenario: Driving 5 white LEDs for main LCD backlight in compact mobile handsets. IC Role / Device Role / Timing Role: Five 25mA MAIN current sources provide uniform, flicker-free dimming across display segments. Use Value: 256-step linear DAC resolution ensures smooth brightness transitions and precise luminance matching across LEDs. |
| Mobile Auxiliary Indicator Lighting | Low-Power Camera Module Power Management |
|
Use Scenario: Status lighting for notification, charging, or proximity sensing in space-constrained devices. IC Role / Device Role / Timing Role: AUX current source operates as a 2-bit controlled indicator LED or general-purpose open-drain output. Use Value: Eliminates need for discrete driver circuitry; reduces BOM count while supporting software-configurable visual feedback. |
Use Scenario: Powering camera sensor modules requiring stable, low-noise bias under variable battery voltage. IC Role / Device Role / Timing Role: Charge pump generates regulated 4.6V/5.1V from 2.9–4.5V VBAT for camera analog front-end rails. Use Value: Fixed-frequency 850kHz operation minimizes EMI interference with RF bands; low-noise constant-frequency mode avoids audible artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1698ETL+ | Single-CAM architecture (1 × 400mA); no CAMHL pin; 16-pin TQFN | Designed for single-camera flash; lacks dual-CAM register switching capability | Select when only one high-current flash channel is needed and board space is constrained |
| TPS61165DRVR | Single-output boost LED driver (1.5A max); no I²C; analog/PWM dimming only | Targeted at high-current single-LED flash; no multi-display or camera register support | Choose for cost-sensitive, non-I²C designs requiring >400mA single-channel output |
Compared with MAX1698ETL+ and TPS61165DRVR, the LTC3209EUF-2#PBF uniquely supports dual independent camera flash channels with hardware-accelerated register switching, making it optimal for modern dual-camera smartphones requiring differentiated preview/capture illumination profiles.
Availability
LTC3209EUF-2#PBF is available at Aetrix Electronics and suitable for smartphone camera modules, mobile display backlighting, and auxiliary indicator lighting requiring stable component supply, automotive-grade reliability, and long-term production continuity.
Supply support for LTC3209EUF-2#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, communications, and portable electronics markets.
The LTC3209EUF-2#PBF belongs to Linear's legacy LED power management product line, engineered specifically for space-constrained, battery-powered mobile devices requiring high-efficiency, multi-display LED control with minimal external components.
FAQ
What is the maximum total output current capability of the LTC3209EUF-2#PBF?
The LTC3209EUF-2#PBF supports up to 200mA per CAM channel (400mA total), 5 × 25mA MAIN outputs (125mA total), and 15mA AUX output - yielding a combined 540mA maximum load. However, continuous operation is limited to 300mA average CPO current per datasheet Note 4; peak loads must respect thermal limits and mode-switching behavior.
How does the CAMHL pin affect LTC3209EUF-2#PBF operation?
The CAMHL pin on the LTC3209EUF-2#PBF selects between two independent 4-bit CAM DAC registers: high when asserted (enabling flash-level current), low when deasserted (enabling preview-level current). A falling edge forces immediate reset to 1x charge pump mode, ensuring consistent startup behavior before high-current activation.
Can the LTC3209EUF-2#PBF be used in fixed 1.5x or 2x mode without automatic switching?
Yes - the LTC3209EUF-2#PBF supports forced mode operation via REGC bits Force1p5 or Force2x. When enabled, the charge pump regulates CPO at 4.6V (1.5x) or 5.1V (2x) regardless of LED dropout conditions, enabling use as a stable auxiliary power supply for camera analog circuits.
What protection features are integrated into the LTC3209EUF-2#PBF?
The LTC3209EUF-2#PBF includes short-circuit protection on all current outputs, thermal shutdown at ~150°C with 15°C hysteresis, open-short LED detection, RREF short-circuit tolerance, and CPO overcurrent limiting (700mA absolute max). These ensure robust operation in unattended mobile environments.
Is the RREF resistor value critical for LTC3209EUF-2#PBF performance?
Yes - the RREF resistor (24.3kΩ typical) directly sets full-scale currents for MAIN (28mA), CAM (200mA per channel), and AUX (13.75mA). Deviations outside 20kΩ–30kΩ range cause proportional scaling errors; 1% tolerance is recommended to maintain specified current accuracy and inter-channel matching.
LTC3209EUF-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 600mA (Total)
- Frequency:
- 850kHz
- Dimming:
- I2C
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC3209EUF-2#PBF FAQ
1.How can I place an order for LTC3209EUF-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3209EUF-2#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 LTC3209EUF-2#PBF reliable?
The price and inventory of LTC3209EUF-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3209EUF-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3209EUF-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3209EUF-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3209EUF-2#PBF?
LTC3209EUF-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3209EUF-2#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 LTC3209EUF-2#PBF?
For technical support, including LTC3209EUF-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3209EUF-2#PBF requirements.
6.How does Aetrix verify that LTC3209EUF-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3209EUF-2#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 LTC3209EUF-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3209EUF-2#PBF?
All LTC3209EUF-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3209EUF-2#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 LTC3209EUF-2#PBF part is unused and in its original packaging.
Return procedure for LTC3209EUF-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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