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Analog Devices Inc. LTC3209EUF-1#TRPBF
- Part No.:
- LTC3209EUF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3209EUF-1#TRPBF.pdf
- Description:
- IC LED DRV RGLTR I2C 600MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,407
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Product details
Overview
LTC3209EUF-1#TRPBF 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 states per channel; and operates with 94% peak efficiency in 1x/1.5x/2x auto-switching charge pump modes. It is used in QVGA+ camera phones requiring precise, low-noise LED current regulation.
For engineers reviewing the LTC3209EUF-1#TRPBF datasheet, LTC3209EUF-1#TRPBF pinout, LTC3209EUF-1#TRPBF application, or LTC3209EUF-1#TRPBF equivalent, key selection criteria include confirmed 20-pin QFN package compatibility, I²C-programmable 8-bit MAIN / 4-bit CAM / 2-bit AUX DAC resolution, guaranteed –40°C to +85°C operation, and validated 1.23V RREF reference voltage with 24.3kΩ set resistor.
Technical Context
The LTC3209EUF-1#TRPBF integrates a constant-frequency 850kHz switched-capacitor charge pump with automatic mode switching (1x → 1.5x → 2x) triggered by MAIN/CAM current source dropout detection. Its internal soft-start limits inrush during mode transitions and startup, while thermal shutdown at ~150°C protects against overtemperature.
It uses a single 24.3kΩ external resistor on RREF to set full-scale currents: 28mA per MAIN (6×), 400mA total for CAM (1×), and 13.75mA for AUX (1×). All outputs are controlled via a standard I²C interface with SDA/SCL referenced to DVCC (1.5V–4.5V), and CAMHL enables fast register switching between high/low flash current levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Pump Modes | Auto-switching 1x/1.5x/2x; enables dynamic efficiency optimization based on LED forward voltage and load |
| Main LED Current Sources | 6 × 25mA (28mA max each), 8-bit linear DAC (256 steps), 1% matching at 50% FS |
| Camera LED Current Source | 1 × 400mA (440mA max), 4-bit linear DAC (16 steps), 400mV dropout voltage at full scale |
| Auxiliary LED Current Source | 1 × 15mA (13.75mA nominal), 2-bit linear DAC (4 states: OFF/33%/67%/100%) |
| I²C Interface | Standard 2-wire bus, 400kHz max clock, DVCC-referenced logic (1.5V–4.5V), 0.16V VOL at 3mA pull-up |
| Operating Temperature | –40°C to +85°C ambient, fully specified with thermal shutdown at ~150°C die temperature |
| Package | 20-lead (4mm × 4mm) QFN with exposed GND pad; θJA = 40°C/W |
Pinout & Package
20-lead (4mm × 4mm) plastic QFN package with exposed thermal pad (Pin 21 = GND, must be soldered to PCB ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPO (Pin 1) | Charge pump output | Delivers regulated 3.6V–5.1V to LED anodes; requires 2.2µF ceramic capacitor to GND |
| MAIN1–6 (Pins 2–7) | Main display current sources | 6 independent 25mA sinks with 8-bit DAC control; each can be disabled by tying to CPO |
| AUX (Pin 8) | Auxiliary display current source | 2-bit DAC-controlled 15mA sink; no dropout sensing; usable as open-drain general-purpose output |
| VBAT1, VBAT2 (Pins 9, 18) | Main power supply inputs | Dual VBAT pins isolate analog/digital noise paths; both require local 2.2µF bypass (VBAT1) and optional 0.1µF (VBAT2) |
| RREF (Pin 10) | Reference current setting | 1.23V internal reference; 24.3kΩ to GND sets MAIN/CAM/AUX full-scale currents |
| DVCC (Pin 11) | Digital supply rail | Logic reference for SDA/SCL/CAMHL; UVLO threshold at 1.0V; decouple with 0.1µF capacitor |
| CAM (Pin 12) | Camera LED current source | 400mA sink with 4-bit DAC; supports dual-register programming via CAMHL pin 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 serial interface | Standard bidirectional data/clock lines; DVCC-referenced; support 400kHz operation |
| C1P/C1M/C2P/C2M (Pins 16–20) | Flying capacitor connections | Four terminals for two 2.2µF X5R/X7R ceramic flying capacitors (C1P–C1M, C2P–C2M) |
Key Features
| Feature | Design Value |
|---|---|
| Multimode charge pump | 94% peak efficiency across 1x/1.5x/2x modes; auto-switching reduces power loss vs fixed-boost architectures |
| Integrated LED current regulation | Precision current sources eliminate external sense resistors; 1% matching ensures uniform display brightness |
| I²C programmability | Independent 8-/4-/2-bit DACs per channel enable fine-grained dimming without MCU GPIO overhead |
| Short-circuit & thermal protection | Automatic shutdown on LED short, open-circuit, or die temperature >150°C; prevents system-level damage |
| Low-noise constant-frequency operation | 850kHz fixed-frequency charge pump minimizes EMI vs variable-frequency alternatives |
Applications
| Smartphone Main Display Backlight | Mobile Camera Flash Driver |
|---|---|
Use Scenario: Driving 6 white LEDs in QVGA+ LCD backlight with smooth 256-step dimming. IC Role / Device Role / Timing Role: Primary LED current controller with integrated charge pump power supply generation. Use Value: Eliminates need for external boost converter and 6 discrete current regulators; reduces BOM count and PCB area. |
Use Scenario: Delivering up to 400mA pulsed current to single high-brightness camera LED for flash illumination. IC Role / Device Role / Timing Role: High-current sink with dual-register I²C/CAMHL control for instant high/low flash mode switching. Use Value: Enables sub-2ms charge pump mode transition for rapid flash readiness without MCU intervention. |
| Secondary Status Display (AUX) | Industrial Handheld UI Backlight |
Use Scenario: Powering small monochrome status indicator (e.g., battery level, signal strength) with 4-level brightness control. IC Role / Device Role / Timing Role: Auxiliary current source with minimal pin count and software-configurable output state. Use Value: Replaces discrete transistor + resistor solution; provides consistent current across voltage and temperature variations. |
Use Scenario: Backlighting ruggedized industrial handheld displays operating in –40°C to +85°C environments. IC Role / Device Role / Timing Role: Temperature-stable LED driver with guaranteed performance across full industrial temperature range. Use Value: Avoids derating or external thermal compensation; maintains brightness consistency in extreme ambient conditions. |
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 400mA camera channel only; no MAIN or AUX outputs; requires external flyback controller for main display | Suitable only for camera-flash-only designs; cannot replace full 6+1+1 channel functionality | Select only when system uses separate main display driver and needs compact flash-only solution |
| TPS61165DRVR | Single-output 400mA boost LED driver; no I²C dimming-uses analog/PWM input; no multimode charge pump | Lacks digital control and multi-channel capability; requires external PWM generator for dimming | Prefer for cost-sensitive, non-I²C systems where software dimming is unnecessary |
Compared with MAX1698ETL+ and TPS61165DRVR, the LTC3209EUF-1#TRPBF uniquely integrates three independent LED current channels with multimode charge pump power conversion and full I²C programmability in a single 4mm × 4mm QFN-enabling complete display backlight + flash control without supplemental ICs.
Availability
LTC3209EUF-1#TRPBF is available at Aetrix Electronics and suitable for smartphone display backlighting, mobile camera flash systems, and industrial handheld UIs requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range operation.
Supply support for LTC3209EUF-1#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 continues its legacy of high-performance analog, mixed-signal, and power management ICs for demanding applications.
The LTC3209EUF-1#TRPBF belongs to Linear's precision LED driver product line, designed specifically for space-constrained, battery-powered mobile devices requiring high-efficiency, digitally controllable multi-display lighting.
FAQ
What is the maximum total output current supported by the LTC3209EUF-1#TRPBF?
The LTC3209EUF-1#TRPBF supports up to 600mA total output current: 6 × 25mA (150mA) for MAIN, 1 × 400mA for CAM, and 1 × 15mA for AUX. The datasheet specifies 440mA absolute maximum for CAM and 31mA per MAIN at full scale, but the device is rated for continuous 600mA aggregate load under proper thermal management and layout.
Does the LTC3209EUF-1#TRPBF require external flying capacitors, and what values are recommended?
Yes, the LTC3209EUF-1#TRPBF requires four external ceramic flying capacitors: two 2.2µF X5R or X7R devices connected between C1P–C1M and C2P–C2M. These capacitors are essential for charge pump operation in 1.5x and 2x modes and must be placed close to the IC per layout guidelines in the datasheet.
Can the LTC3209EUF-1#TRPBF operate with a 2.9V input supply?
Yes, the LTC3209EUF-1#TRPBF supports VBAT from 2.9V to 4.5V. At 2.9V input, the 1.5x mode delivers up to ~4.35V and 2x mode up to ~5.8V at CPO, sufficient to drive typical white LEDs (VF ≈ 3.2V) with margin for current source dropout voltage (180mV for MAIN, 400mV for CAM).
How does the CAMHL pin affect charge pump behavior in the LTC3209EUF-1#TRPBF?
The CAMHL pin selects between high/low camera current registers and forces a reset to 1x charge pump mode on its falling edge. When asserted high, it also reduces dropout detection delay from 150ms to 2ms-enabling rapid mode switching for flash applications. This behavior is exclusive to the LTC3209EUF-1#TRPBF and LTC3209EUF-2#TRPBF variants.
Is the RREF pin on the LTC3209EUF-1#TRPBF internally biased, and what resistor value sets nominal full-scale currents?
Yes, the RREF pin has an internal 1.23V reference. A 24.3kΩ ±1% resistor to ground sets nominal full-scale currents of 28mA per MAIN output, 400mA for CAM, and 13.75mA for AUX. The datasheet confirms RREF voltage tolerance is 1.20V–1.26V and acceptable resistor range is 20kΩ–30kΩ.
LTC3209EUF-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3209EUF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3209EUF-1#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 LTC3209EUF-1#TRPBF reliable?
The price and inventory of LTC3209EUF-1#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3209EUF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3209EUF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3209EUF-1#TRPBF?
LTC3209EUF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3209EUF-1#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 LTC3209EUF-1#TRPBF?
For technical support, including LTC3209EUF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3209EUF-1#TRPBF requirements.
6.How does Aetrix verify that LTC3209EUF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3209EUF-1#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 LTC3209EUF-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3209EUF-1#TRPBF?
All LTC3209EUF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3209EUF-1#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 LTC3209EUF-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3209EUF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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