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Analog Devices Inc. LTC3209EUF-2
- Part No.:
- LTC3209EUF-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3209EUF-2.pdf
- Description:
- IC LED DRV RGLTR I2C 600MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,094
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Product details
Overview
LTC3209EUF-2 from Analog Devices (formerly Linear Technology) is a highly integrated multimode charge pump LED controller optimized for dual-camera flash and main display backlighting in mobile devices. It delivers up to 200mA per CAM channel (2×), 25mA per MAIN channel (5×), and 15mA on AUX, with I²C-programmable dimming across 256/16/4 brightness states respectively, and automatic 1x/1.5x/2x mode switching for ≥94% efficiency across 2.9V–4.5V input.
For engineers reviewing the LTC3209EUF-2 datasheet, LTC3209EUF-2 pinout, LTC3209EUF-2 application, or LTC3209EUF-2 equivalent, key selection criteria include dual-CAM current sourcing capability, QFN-20 package thermal performance, I²C-controlled dropout-aware mode switching, and RREF-referenced current matching across MAIN/CAM/AUX channels.
Technical Context
The LTC3209EUF-2 implements a 2-phase, 850kHz switched-capacitor charge pump with three operating modes: direct pass-through (1x), 1.5× boost (up to 4.6V), and 2× boost (up to 5.1V). Mode transitions are triggered by dropout detection on any enabled MAIN or CAM current source, with programmable 2ms or 150ms delay via REGC.
It integrates five 8-bit linear MAIN DACs (0–28mA), two independent 4-bit CAM DACs (0–200mA each), and one 2-bit AUX DAC (0–13.75mA), all referenced to a precision 1.23V RREF voltage. The exposed-pad 4mm × 4mm QFN package provides low θJA = 40°C/W for sustained 600mA total output current handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Pump Modes | 1x (VBAT→CPO), 1.5x (max 4.6V), 2x (max 5.1V); auto-switched on LED dropout or forced via I²C REGC |
| MAIN Output Capability | 5 × 25mA channels, 256-step linear dimming (8-bit DAC), 1% matching at 50% FS |
| CAM Output Capability | 2 × 200mA channels, 16-step dimming (4-bit DAC each), independent high/low registers selectable via CAMHL or I²C |
| AUX Output Capability | 1 × 15mA channel, 4-step dimming (2-bit DAC), also usable as I²C-controlled open-drain general-purpose output |
| Input Voltage Range | VBAT: 2.9V–4.5V; DVCC: 1.5V–4.5V; supports Li-ion battery operation with UVLO at 1.5V (VBAT) and 1V (DVCC) |
| Efficiency & Noise | Up to 94% peak efficiency; constant-frequency 850kHz operation enables predictable EMI filtering; soft-start limits inrush during mode transitions |
| Protection Features | Short-circuit, thermal shutdown (~150°C), open-short LED detection, and indefinite CPO/RREF short-circuit tolerance |
Pinout & Package
Package: 20-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 21 = GND), θJA = 40°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPO (Pin 1) | Charge pump output | Delivers regulated boosted voltage (1x/1.5x/2x) to MAIN/CAM/AUX LED anodes; requires 2.2µF ceramic capacitor to GND |
| MAIN1–5 (Pins 2–6) | Main display current sources | Five independent 8-bit DAC-controlled sinks (0–28mA); disabled by writing 0x00 to REGA or connecting to CPO |
| AUX (Pin 7) | Auxiliary display current source | 2-bit DAC-controlled sink (0–13.75mA); no dropout sensing; can serve as I²C-controlled open-drain output |
| VBAT1/VBAT2 (Pins 8, 18) | Power supply inputs | Dual VBAT pins isolate charge pump noise from analog/digital sections; both require local 2.2µF (VBAT1) + 0.1µF (VBAT2) decoupling |
| RREF (Pin 9) | Reference current set node | 1.23V reference; 24.3kΩ resistor to GND sets full-scale currents for MAIN (28mA), CAM (200mA each), and AUX (13.75mA) |
| DVCC (Pin 10) | Digital supply rail | Logic-level reference for SDA/SCL/CAMHL; UVLO at 1V forces all registers to zero; decouple with 0.1µF capacitor |
| CAM1/CAM2 (Pins 11, 12) | Camera flash current sources | Two independent 4-bit DAC-controlled sinks (0–200mA each); selectable high/low registers via CAMHL or I²C; disable by writing 0x00 to REGB |
| CAMHL (Pin 13) | Camera register select | High = select CAM high-current register (fast 2ms dropout response); low = select CAM low-current register; falling edge resets charge pump to 1x mode |
| SDA/SCL (Pins 14, 15) | I²C serial interface | Standard 2-wire bus (400kHz compliant); DVCC-referenced logic; supports repeated start/stop; static registers allow ultra-low-speed operation |
| C1P/C1M/C2P/C2M (Pins 16–20) | Flying capacitor connections | Four terminals for two 2.2µF X5R/X7R ceramic flying caps; critical for charge pump efficiency and ripple suppression |
Key Features
| Feature | Design Value |
|---|---|
| Auto-adaptive charge pump mode switching | Eliminates manual power mode selection-dynamically shifts between 1x/1.5x/2x based on real-time LED voltage headroom, preserving efficiency without firmware intervention |
| Dual independent CAM current sources | Enables simultaneous control of main and secondary camera flashes (e.g., front/rear or wide/tele) with separate 4-bit dimming and register selection-no external muxing required |
| Hardware-accelerated CAM register switching | CAMHL pin allows sub-2ms transition between high-power flash and low-power preview modes, bypassing I²C latency for responsive camera UX |
| Thermal and fault robustness | Integrated thermal shutdown (~150°C), open-short LED detection, and indefinite short-circuit tolerance on CPO/RREF ensure field reliability in compact handheld enclosures |
| Low-noise constant-frequency operation | Fixed 850kHz charge pump clock enables deterministic EMI filter design and avoids audible noise in sensitive audio/display subsystems |
Applications
| Smartphone Dual-Camera Flash | QVGA+ Main Display Backlight |
|---|---|
|
Use Scenario: Simultaneous illumination of primary and secondary cameras during low-light capture, with independent brightness control and fast flash-to-preview transition. IC Role / Device Role / Timing Role: Dual 200mA CAM current sources provide synchronized or staggered flash drive; CAMHL pin enables <2ms register switch for preview mode. Use Value: Eliminates need for discrete flash drivers and timing controllers-reduces BOM count and PCB area while enabling hardware-fast flash sequencing. |
Use Scenario: Driving 5 white LEDs in parallel for main LCD backlight in mid-tier smartphones with Li-ion battery supply (2.9–4.5V). IC Role / Device Role / Timing Role: Five 25mA MAIN current sources deliver matched, I²C-dimmable current; auto-boost maintains regulation as battery discharges. Use Value: Maintains consistent display brightness across full battery range without requiring DC-DC pre-regulator-simplifies power architecture. |
| Tablet Auxiliary Indicator Lighting | Industrial Handheld Camera Module |
|
Use Scenario: Controlling status LEDs (power, connectivity, alert) with minimal GPIO usage and software-defined intensity levels. IC Role / Device Role / Timing Role: AUX pin serves as 4-step dimmable current sink or open-drain digital output under I²C command. Use Value: Replaces discrete LED driver + GPIO expander; reduces component count and firmware overhead for multi-state visual indicators. |
Use Scenario: Powering embedded vision modules in ruggedized industrial scanners or barcode readers requiring reliable flash illumination. IC Role / Device Role / Timing Role: Robust 200mA CAM outputs with thermal protection and dropout-aware boosting operate reliably across wide temperature (–40°C to 85°C) and input voltage ranges. Use Value: Ensures consistent flash intensity despite voltage sag during motor actuation or cold ambient-critical for image capture fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3644TME/NOPB | Single 1.5A flash driver with analog/PWM dimming; no MAIN display support; uses single-wire TurboMode interface instead of I²C | Optimized for high-current single-flash use only; lacks multi-display integration and programmable mode switching | Select when only high-power flash is needed and I²C bus resources are constrained |
| MAX20050ATP/V+T | 6-channel 30mA LED driver with SPI interface; no charge pump-requires external 5V supply; fixed 500kHz switching | Suitable for always-on displays but not battery-powered flash; no auto-boost or thermal foldback | Select for automotive display clusters where stable 5V rail exists and flash functionality is unnecessary |
Compared with LM3644TME/NOPB and MAX20050ATP/V+T, the LTC3209EUF-2 uniquely integrates dual-CAM flash, MAIN backlight, and AUX indicator control with adaptive charge pumping-enabling single-chip, battery-efficient multi-display lighting without external regulators or complex timing coordination.
Availability
LTC3209EUF-2 is available at Aetrix Electronics and suitable for smartphone camera modules, QVGA+ display backlighting, and industrial handheld vision systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC3209EUF-2 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 semiconductors, serving communications, automotive, industrial, and consumer markets.
The LTC3209EUF-2 belongs to Linear's legacy LED driver portfolio, designed specifically for space-constrained mobile devices needing integrated, efficient, and intelligent multi-display lighting control with minimal external components.
FAQ
What is the maximum total output current supported by the LTC3209EUF-2?
The LTC3209EUF-2 supports up to 600mA total output current: 5 × 25mA MAIN channels (125mA), 2 × 200mA CAM channels (400mA), and 1 × 15mA AUX channel (15mA). This aggregate rating assumes proper thermal management via the exposed-pad QFN package and adequate PCB copper area.
How does the LTC3209EUF-2 handle voltage dropout across its LED current sources?
The LTC3209EUF-2 monitors voltage headroom at MAIN and CAM outputs. When dropout is detected (e.g., MAIN pin voltage drops below required level for programmed current), it automatically switches the charge pump from 1x → 1.5x → 2x mode after a configurable delay (2ms or 150ms). The LTC3209EUF-2 resets to 1x mode on any I²C register update or CAMHL falling edge.
Can the AUX pin on the LTC3209EUF-2 be used for purposes other than LED driving?
Yes-the AUX pin on the LTC3209EUF-2 functions as both a 2-bit DAC-controlled current sink (0–13.75mA) and an I²C-configurable open-drain general-purpose output. When configured as a digital output, it supports standard logic-level signaling and can drive small loads such as status indicators or enable lines without requiring additional GPIO resources.
What external components are required to operate the LTC3209EUF-2?
The LTC3209EUF-2 requires only four 2.2µF ceramic flying capacitors (C1P/C1M/C2P/C2M), one 2.2µF output capacitor on CPO, a 24.3kΩ resistor from RREF to GND, and local decoupling: 2.2µF + 0.1µF on VBAT1/VBAT2 and 0.1µF on DVCC. No inductors or electrolytic capacitors are needed-enabling ultra-compact layout.
Is the LTC3209EUF-2 pin-compatible with the LTC3209EUF-1?
No-the LTC3209EUF-2 and LTC3209EUF-1 share the same 20-pin QFN package and pinout, but differ functionally: LTC3209EUF-1 provides 6 MAIN + 1 CAM outputs, while LTC3209EUF-2 provides 5 MAIN + 2 CAM outputs. Pin mapping is identical, but register configuration and current source allocation differ; PCB reuse is possible only if CAM1/CAM2 routing matches the dual-CAM requirement.
LTC3209EUF-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC3209EUF-2 FAQ
1.How can I place an order for LTC3209EUF-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3209EUF-2 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 reliable?
The price and inventory of LTC3209EUF-2 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 is usually 5 days.
3.What payment methods are accepted for LTC3209EUF-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3209EUF-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3209EUF-2?
LTC3209EUF-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3209EUF-2 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?
For technical support, including LTC3209EUF-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3209EUF-2 requirements.
6.How does Aetrix verify that LTC3209EUF-2 is sourced from the original manufacturer or authorized distributors?
All LTC3209EUF-2 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 meets industry standards.
7.What is the process for return or replacement of LTC3209EUF-2?
All LTC3209EUF-2 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3209EUF-2, 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 part is unused and in its original packaging.
Return procedure for LTC3209EUF-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3209EUF-2 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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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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