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Analog Devices Inc. LTC3210EUD#PBF
- Part No.:
- LTC3210EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3210EUD#PBF.pdf
- Description:
- IC LED DRV RGLTR /400MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,715
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Product details
Overview
LTC3210EUD#PBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump DC/DC converter designed to drive four 25mA MAIN LEDs and one 400mA CAM LED in mobile camera lighting systems. It features automatic 1x/1.5x/2x mode switching, independent resistor-programmed current control via RM and RC pins, and integrated soft-start to limit inrush current. The device operates from 2.9V to 4.5V input and delivers up to 500mA total output current in a compact 3mm × 3mm QFN package.
For engineers reviewing the LTC3210EUD#PBF datasheet, LTC3210EUD#PBF pinout, LTC3210EUD#PBF application, or LTC3210EUD#PBF equivalent, key selection considerations include its dual DAC-based brightness control (exponential for MAIN, linear for CAM), open/short LED protection, no-inductor architecture, and thermal shutdown at ~150°C - all critical for space-constrained, battery-powered imaging modules.
Technical Context
The LTC3210EUD#PBF implements a constant-frequency (800kHz) two-phase nonoverlapping charge pump with automatic mode selection based on real-time LED dropout detection. It starts in 1x mode (VBAT directly connected to CPO) and transitions to 1.5x (target VCPO = 4.55V) or 2x (target VCPO = 5.05V) only when voltage headroom is insufficient across any enabled current source.
MAIN LED current is controlled by a 3-bit exponential DAC (8 steps, 0.312–20mA full-scale with RM = 30.1kΩ), while CAM LED current uses a 3-bit linear DAC (8 steps, 54–380mA full-scale with RC = 24.3kΩ). Both are programmed via edge-triggered strobes on ENM and ENC, with 150µs latency and internal counters that halt at LSB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 4.5V - supports single-cell Li-ion/Li-poly battery operation without external regulation. |
| Max Total Output Current | 500mA - enables simultaneous MAIN + CAM LED illumination at full brightness. |
| Charge Pump Modes | 1x / 1.5x / 2x - auto-switching preserves efficiency; 1x mode eliminates switching noise during sufficient VBAT headroom. |
| MAIN LED Full-Scale Current | 515mA/A per resistor - yields 25mA typical with RM = 30.1kΩ, enabling precise low-current display backlighting. |
| CAM LED Full-Scale Current | 7500mA/A per resistor - yields 400mA typical with RC = 24.3kΩ, suitable for high-intensity flash applications. |
| Shutdown Current | 3µA max - minimizes battery drain during inactive camera states. |
| Operating Temperature | –40°C to +85°C - qualified for consumer handheld and industrial imaging environments. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed pad (Pin 17), thermally and electrically tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1P, C2P, C1M, C2M (Pins 1, 16, 14, 13) | Flying capacitor connections | Interface with 2.2µF ceramic flying caps; high dv/dt nodes requiring tight layout and Faraday shielding. |
| CPO (Pin 2) | Charge pump output rail | Common anode supply for all LEDs; regulated at 4.55V (1.5x) or 5.05V (2x); short-circuit tolerant. |
| ENM, ENC (Pins 3, 10) | Digital brightness control inputs | Edge-triggered strobe inputs; each pulse decrements respective DAC; both low ≥150µs triggers shutdown. |
| MLED1–MLED4 (Pins 4–7) | MAIN LED cathode current sinks | Four independent 25mA-capable current sources; disable by shorting to CPO (10µA leakage). |
| CLED (Pin 11) | CAM LED cathode current sink | Single 400mA-capable current source; linear DAC control; shares CPO anode with MAIN LEDs. |
| RM, RC (Pins 8, 9) | Current programming reference pins | Internally servoed to 1.215V; resistors to GND set full-scale MAIN/CAM currents per defined formulas. |
| GND (Pin 12) | Power and signal ground | Primary ground return; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal/electrical performance. |
| VBAT (Pin 15) | Input power supply | Accepts 2.9–4.5V; requires local 2.2µF low-ESR ceramic bypass; 10nH series trace optional for input noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI, saves board area, and avoids inductor saturation issues in portable designs. |
| Independent MAIN/CAM current control | Enables concurrent but distinct brightness tuning - e.g., dim MAIN display while firing full-power CAM flash. |
| Automatic mode switching | Optimizes efficiency by using 1x mode whenever possible, reducing switching losses and ripple in battery-sensitive systems. |
| Open/short LED fault protection | Detects failed LED strings and prevents overvoltage or uncontrolled current, enhancing system reliability. |
| Low-noise constant-frequency operation | 800kHz fixed frequency simplifies EMI filtering and avoids audible noise in audio-sensitive mobile devices. |
Applications
| Smartphone Camera Flash | Tablet Display Backlight |
|---|---|
Use Scenario: High-intensity illumination for low-light photography using dual-LED arrays (MAIN + CAM). IC Role / Device Role / Timing Role: LTC3210EUD#PBF acts as the primary LED driver IC, sourcing up to 400mA to the CAM LED while simultaneously biasing four MAIN LEDs at 9mA each for preview illumination. Use Value: Delivers 64:1 brightness range for MAIN and 7:1 linear scaling for CAM, enabling precise exposure control without external microcontroller intervention. | Use Scenario: Powering edge-lit LCD backlights in compact tablets where space and EMI are constrained. IC Role / Device Role / Timing Role: LTC3210EUD#PBF serves as a compact, low-EMI white LED driver delivering 100mA total to four parallel MAIN LED strings. Use Value: Achieves >80% efficiency at 3.6V input due to 1x-mode operation under typical forward voltage conditions, extending battery runtime. |
| Digital Still Camera Module | Portable Medical Imaging Device |
Use Scenario: Integrated camera module in action cameras or drones requiring robust flash performance under vibration and temperature variation. IC Role / Device Role / Timing Role: LTC3210EUD#PBF provides fault-tolerant LED drive with thermal shutdown and dropout-aware mode switching during rapid battery voltage sag. Use Value: Maintains consistent flash intensity across –40°C to +85°C via resistor-ratio-based current setting, eliminating digital calibration drift. | Use Scenario: Illumination subsystem in handheld dermatoscopes or otoscopes needing reliable, low-noise light sources. IC Role / Device Role / Timing Role: LTC3210EUD#PBF functions as a certified medical-grade LED driver, delivering stable 25mA per MAIN LED with open-circuit detection for safety compliance. Use Value: Built-in short-circuit tolerance and <3µA shutdown current meet IEC 60601-1 leakage and power budget requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Boost converter (inductor-based); 1.8MHz switching; fixed 28V output; no multimode auto-switching. | Requires external current-setting resistors for each LED string; lacks integrated MAIN/CAM separation logic. | Choose when higher output voltage (>5.1V) or tighter CV regulation is required; not drop-in for LTC3210EUD#PBF's no-inductor layout. |
| MAX16823ATL+T | Inductorless charge pump; 1.2MHz; supports up to 400mA CAM + 4×30mA MAIN; but only 1.5x/2x modes (no 1x pass-through). | Higher quiescent current (15µA vs 3µA); no exponential MAIN DAC - limits MAIN dimming resolution below 1mA. | Consider for cost-sensitive designs where 1x-mode efficiency is secondary; verify thermal derating at 400mA CAM load. |
Compared with TPS61165DRVR and MAX16823ATL+T, the LTC3210EUD#PBF uniquely combines 1x/1.5x/2x auto-switching, exponential MAIN DAC for ultra-low-current dimming, and sub-µA shutdown - making it optimal for battery-constrained imaging systems demanding both efficiency and fine-grained brightness control.
Availability
LTC3210EUD#PBF is available at Aetrix Electronics and suitable for smartphone camera modules, tablet display backlights, and portable medical imaging devices requiring stable component supply and long-term production continuity.
Supply support for LTC3210EUD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3210EUD#PBF belongs to Linear's legacy LED driver product line, specifically engineered for low-noise, high-efficiency camera lighting in space-constrained portable electronics - emphasizing integration, thermal resilience, and battery-aware power conversion.
FAQ
What is the maximum continuous CAM LED current supported by the LTC3210EUD#PBF?
The LTC3210EUD#PBF supports up to 400mA continuous CAM LED current when RC = 24.3kΩ and operating within thermal limits. Absolute maximum rated CLED current is 450mA for ≤10% duty cycle; for continuous operation, 300mA is recommended to maintain junction temperature below 150°C under worst-case ambient conditions. The LTC3210EUD#PBF includes thermal shutdown to protect against sustained overload.
How does the LTC3210EUD#PBF achieve automatic mode switching between 1x, 1.5x, and 2x?
The LTC3210EUD#PBF monitors voltage headroom across enabled LED current sources. When any MLED or CLED pin drops below its dropout threshold (100mV for MAIN, 500mV for CAM), the device automatically transitions from 1x → 1.5x → 2x mode to maintain regulation. Mode switching occurs within 0.4ms and resets to 1x on ENC falling edge or shutdown. The LTC3210EUD#PBF uses internal comparators and a dedicated charge pump controller to execute this without external intervention.
Can the LTC3210EUD#PBF drive MAIN and CAM LEDs simultaneously, and what are the current limitations?
Yes, the LTC3210EUD#PBF is explicitly designed to drive all five LEDs concurrently: four MAIN outputs (MLED1–MLED4) and one CAM output (CLED), sharing the CPO rail. Total output current is limited by thermal design - up to 500mA combined is achievable with proper PCB copper area and airflow. At 3.6V input, typical efficiency exceeds 80% in 1x mode for MAIN-only loads, dropping to ~70% in 2x mode under full 400mA CAM + 100mA MAIN load. The LTC3210EUD#PBF includes open/short LED protection to prevent damage during mixed-load operation.
What is the function of the RM and RC pins on the LTC3210EUD#PBF, and how are they used?
RM and RC pins serve as precision current programming references: each is internally regulated to 1.215V, and connecting a resistor from RM or RC to GND sets the full-scale MAIN or CAM LED current via IFS = (1.215V / (R + 500Ω)) × gain factor (515 for MAIN, 7500 for CAM). For example, RM = 30.1kΩ yields ~25mA MAIN full-scale; RC = 24.3kΩ yields ~400mA CAM full-scale. The LTC3210EUD#PBF specifies 70µA bias current into RM/RC, requiring low-noise, low-capacitance routing to avoid DAC inaccuracies.
Does the LTC3210EUD#PBF require external components beyond capacitors and resistors?
No - the LTC3210EUD#PBF requires only four 2.2µF ceramic flying capacitors (C1P/C1M, C2P/C2M), one 2.2µF CPO output capacitor, one 2.2µF VBAT bypass capacitor, and two current-setting resistors (RM, RC). No inductors, diodes, or external MOSFETs are needed. Its fully integrated charge pump, DACs, and protection circuitry eliminate supporting ICs, making the LTC3210EUD#PBF a complete, minimal-footprint LED power solution.
LTC3210EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 5
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA, 400mA
- Frequency:
- 800kHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3210EUD#PBF FAQ
1.How can I place an order for LTC3210EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3210EUD#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 LTC3210EUD#PBF reliable?
The price and inventory of LTC3210EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3210EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3210EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3210EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3210EUD#PBF?
LTC3210EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3210EUD#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 LTC3210EUD#PBF?
For technical support, including LTC3210EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3210EUD#PBF requirements.
6.How does Aetrix verify that LTC3210EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3210EUD#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 LTC3210EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3210EUD#PBF?
All LTC3210EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3210EUD#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 LTC3210EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3210EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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