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Analog Devices Inc. LTC3209EUF-1#PBF
- Part No.:
- LTC3209EUF-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3209EUF-1#PBF.pdf
- Description:
- IC LED DRV RGLTR I2C 600MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,940
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Product details
Overview
LTC3209EUF-1#PBF from Analog Devices (formerly Linear Technology) is a highly integrated multimode charge pump LED controller for mobile display backlighting. It delivers up to 600mA total output current across six 25mA MAIN, one 400mA CAM, and one 15mA AUX current sources; supports 256/16/4 brightness levels per channel; and operates with 94% peak efficiency in 1x/1.5x/2x charge pump modes. It targets QVGA+ camera phone main/camera/AUX LED displays.
For engineers reviewing the LTC3209EUF-1#PBF datasheet, LTC3209EUF-1#PBF pinout, LTC3209EUF-1#PBF application, or LTC3209EUF-1#PBF equivalent, key selection criteria include confirmed 20-pin 4mm × 4mm QFN package, I²C-programmable 8-bit MAIN / 4-bit CAM / 2-bit AUX DAC resolution, automatic mode switching based on dropout detection, thermal/short-circuit protection, and guaranteed operation from –40°C to +85°C.
Technical Context
The LTC3209EUF-1#PBF integrates a constant-frequency 850kHz switched-capacitor charge pump with three independent current-source banks (MAIN, CAM, AUX), each driven by dedicated linear DACs. Its mode control logic monitors voltage headroom at MAIN/CAM outputs and triggers deterministic transitions from 1x → 1.5x → 2x based on dropout detection with 150ms (or 2ms with CAMHL) delay.
It employs internal soft-start during mode transitions to limit inrush current, uses RREF = 24.3kΩ to set full-scale currents (28mA MAIN, 400mA CAM, 13.75mA AUX), and features I²C-compatible SDA/SCL pins referenced to DVCC (1.5–4.5V), with CAMHL enabling fast register switching between high/low camera current settings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Pump Modes | 1x (direct VBAT), 1.5x (up to 4.6V), 2x (up to 5.1V); auto-switched or fixed via I²C |
| MAIN Output Current | 0–28mA per channel (6 channels), 8-bit linear DAC, ±1% matching at 50% FS |
| CAM Output Current | 0–400mA (single channel), 4-bit linear DAC, 400mV dropout threshold |
| AUX Output Current | 0–13.75mA (1 channel), 2-bit linear DAC (OFF/33%/67%/100%) |
| I²C Interface | Standard 2-wire bus, 400kHz max clock, DVCC-referenced logic (1.5–4.5V) |
| Operating Temp | –40°C to +85°C ambient; thermal shutdown at ~150°C die temperature |
| 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 performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPO (Pin 1) | Charge pump output | Supplies regulated voltage (1x/1.5x/2x) to MAIN/CAM/AUX current sources; requires 2.2µF ceramic capacitor to GND |
| MAIN1–6 (Pins 2–7) | Main display current sources | Each provides 0–28mA with 8-bit DAC control; disabled by writing 0 to REGA or connecting to CPO |
| AUX (Pin 8) | Auxiliary display current source | 0–13.75mA with 2-bit DAC; no dropout sensing; can serve as I²C-controlled open-drain GPIO |
| VBAT1/VBAT2 (Pins 9, 18) | Main power supply inputs | Isolated inputs for analog/digital sections; both must connect externally and bypass with 2.2µF (VBAT1) + 0.1µF (VBAT2) |
| RREF (Pin 10) | Reference current setting | 1.23V reference; 24.3kΩ to GND sets full-scale currents for all channels |
| DVCC (Pin 11) | Digital I/O supply | Logic reference (1.5–4.5V); UVLO at 1V forces all registers to zero |
| CAM (Pin 12) | Camera display current source | 0–400mA with 4-bit DAC; two registers (high/low) selectable via CAMHL or I²C |
| CAMHL (Pin 13) | Camera register select | High = CAM high-current register; low = CAM low-current register; falling edge resets charge pump to 1x mode |
| SDA/SCL (Pins 14, 15) | I²C data/clock | Standard 2-wire interface; DVCC-referenced; pull-ups required externally |
| C1P/C1M/C2P/C2M (Pins 16–20) | Flying capacitor connections | Two 2.2µF X5R/X7R ceramic caps required (C1P–C1M, C2P–C2M) |
Key Features
| Feature | Design Value |
|---|---|
| Multimode charge pump | Delivers up to 94% efficiency across 1x/1.5x/2x modes with automatic, load-dependent switching |
| Independent DAC resolution | 8-bit (256-step) MAIN, 4-bit (16-step) CAM, and 2-bit (4-step) AUX dimming control via single I²C bus |
| Thermal & fault protection | Integrated thermal shutdown (~150°C), short-circuit detection, open-shorted LED monitoring, and RREF short-circuit tolerance |
| Low-noise constant-frequency operation | Fixed 850kHz charge pump clock minimizes EMI and enables predictable filtering design |
| Programmable mode forcing | I²C registers allow fixed 1.5x or 2x operation-bypassing auto-switching-for stable power supply use cases |
Applications
| QVGA+ Main Display Backlight | Camera Flash LED Driver |
|---|---|
Use Scenario: Driving 6 white LEDs in smartphone main LCD backlight requiring uniform brightness and low ripple. IC Role / Device Role / Timing Role: Provides precision current regulation per LED string with 8-bit DAC control and automatic charge pump mode adaptation to maintain regulation as LED VF changes with temperature. Use Value: Enables consistent luminance across 256 brightness steps while maintaining >90% efficiency over 3.0–4.5V input range and eliminating need for inductive boost converters. | Use Scenario: Powering high-current white LED for smartphone camera flash with rapid on/off and intensity control. IC Role / Device Role / Timing Role: Delivers up to 400mA through single CAM current source with dual-register (high/low) selection via CAMHL pin for instant flash vs. preview mode switching. Use Value: Achieves sub-2ms mode transition when CAMHL asserted, enabling precise flash timing without I²C reconfiguration latency. |
| Auxiliary Status Indicator | Multi-Display Mobile UI |
Use Scenario: Controlling small status LED (e.g., charging indicator, notification light) with minimal footprint and BOM count. IC Role / Device Role / Timing Role: Supplies 0–13.75mA via 2-bit AUX current source; doubles as open-drain GPIO when not used for LED drive. Use Value: Eliminates discrete transistor/FET for auxiliary lighting, reducing component count and PCB area while supporting simple ON/OFF or 3-level intensity control. | Use Scenario: Simultaneous management of main display, camera flash, and auxiliary indicator in space-constrained handheld devices. IC Role / Device Role / Timing Role: Integrates three independent current-source banks, shared charge pump, and unified I²C interface into single 4mm × 4mm QFN. Use Value: Reduces total solution size by >40% versus discrete LED drivers, cuts bill-of-materials by eliminating 3–4 external MOSFETs, gate drivers, and inductors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1698EUT+T | Single 400mA boost LED driver; no MAIN/AUX banks; analog dimming only; 16-pin TDFN | Supports camera flash only-not multi-display systems; lacks I²C interface and digital dimming | Select only if system requires flash-only drive with analog PWM dimming and no auxiliary/main display support |
| TPS61165DRVR | Single-output 400mA boost LED driver; I²C interface; 8-bit dimming; 6-pin WSON | No MAIN or AUX current sources; no multimode charge pump; fixed 2x topology only | Choose when compact flash-only solution is needed and system already uses separate main display driver |
Compared with MAX1698EUT+T and TPS61165DRVR, the LTC3209EUF-1#PBF uniquely integrates MAIN/CAM/AUX current sources with adaptive multimode charge pump and unified I²C control-enabling single-chip triple-display management where space, efficiency, and coordinated dimming are critical.
Availability
LTC3209EUF-1#PBF is available at Aetrix Electronics and suitable for QVGA+ smartphone displays, camera flash subsystems, auxiliary status indicators, and multi-display portable electronics requiring stable component supply and long-term production continuity.
Supply support for LTC3209EUF-1#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, formed through the acquisition of Linear Technology in 2017.
The LTC3209EUF-1#PBF belongs to ADI's legacy Linear Technology LED driver product line, designed specifically for space-constrained, battery-powered mobile devices requiring high-efficiency, digitally programmable multi-display backlight and flash control.
FAQ
What is the maximum total output current capability of the LTC3209EUF-1#PBF?
The LTC3209EUF-1#PBF supports up to 600mA total output current: 6 × 25mA MAIN channels (150mA), 1 × 400mA CAM channel, and 1 × 15mA AUX channel. Continuous operation is limited to 300mA average CPO current; peak CAM current is rated for ≤10% duty cycle under absolute maximum conditions.
How does the LTC3209EUF-1#PBF handle charge pump mode transitions?
The LTC3209EUF-1#PBF automatically switches from 1x → 1.5x → 2x mode upon detecting dropout at any enabled MAIN or CAM output, with a default 150ms confirmation delay. The delay reduces to 2ms when CAMHL is asserted high or the DROP2MS bit is set in REGC. Mode resets to 1x after any I²C data update or CAMHL falling edge.
Can the AUX output of the LTC3209EUF-1#PBF be used for purposes other than LED driving?
Yes-the AUX output of the LTC3209EUF-1#PBF functions as an I²C-controlled open-drain general-purpose output when not used for LED current sourcing. It supports 0–13.75mA with 2-bit resolution and retains full digital control via the same I²C interface used for MAIN and CAM channels.
What external components are required for basic operation of the LTC3209EUF-1#PBF?
Basic operation of the LTC3209EUF-1#PBF requires four 2.2µF X5R/X7R ceramic flying/output capacitors (C1P/C1M, C2P/C2M, CCPO), one 24.3kΩ 1% resistor from RREF to GND, a 0.1µF DVCC bypass capacitor, and external pull-up resistors on SDA/SCL. No inductors or diodes are needed.
Is the LTC3209EUF-1#PBF pin-compatible with the LTC3209EUF-2#PBF?
No-the LTC3209EUF-1#PBF and LTC3209EUF-2#PBF share the same 20-pin 4mm × 4mm QFN package and pinout, but differ functionally: LTC3209EUF-1#PBF provides 6 MAIN + 1 CAM outputs, while LTC3209EUF-2#PBF provides 5 MAIN + 2 CAM outputs. Register maps and CAM current scaling also differ; PCB layout is identical but firmware must match the variant.
LTC3209EUF-1#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-1#PBF FAQ
1.How can I place an order for LTC3209EUF-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3209EUF-1#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-1#PBF reliable?
The price and inventory of LTC3209EUF-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3209EUF-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3209EUF-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3209EUF-1#PBF?
LTC3209EUF-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3209EUF-1#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-1#PBF?
For technical support, including LTC3209EUF-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3209EUF-1#PBF requirements.
6.How does Aetrix verify that LTC3209EUF-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3209EUF-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3209EUF-1#PBF?
All LTC3209EUF-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3209EUF-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3209EUF-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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