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Analog Devices Inc. LTC3210EUD#TRPBF
- Part No.:
- LTC3210EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3210EUD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 25MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
LTC3210EUD#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump DC/DC converter designed to drive four 25mA MAIN LED outputs and one 400mA CAM LED output for camera lighting in mobile devices. It features automatic 1x/1.5x/2x mode switching, independent resistor-programmed current control via RM and RC pins, and operates from 2.9V to 4.5V input. Its 3mm × 3mm 16-lead QFN package supports compact cellphone and DSC camera designs.
For engineers reviewing the LTC3210EUD#TRPBF datasheet, LTC3210EUD#TRPBF pinout, LTC3210EUD#TRPBF application, or LTC3210EUD#TRPBF equivalent, key selection criteria include its 8-step exponential MAIN brightness control (64:1 range), 8-step linear CAM current control (380mA full-scale), open/short LED protection, 3µA shutdown current, and no-inductor architecture enabling low EMI camera flash solutions.
Technical Context
The LTC3210EUD#TRPBF implements a two-phase nonoverlapping 800kHz oscillator driving a switched-capacitor 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 (regulated at 4.55V) or 2x (regulated at 5.05V) only when MLED or CLED current sources enter dropout-ensuring highest efficiency at all operating points.
Current regulation uses internal 1.215V reference servos on RM and RC pins to set full-scale currents: MLED = (1.215V/(RM + 500Ω)) × 515 and CLED = (1.215V/(RC + 500Ω)) × 7500. Brightness is adjusted via ENM (3-bit exponential DAC, 0.312–20mA per MAIN LED) and ENC (3-bit linear DAC, 54–380mA for CAM LED), each requiring ≥60ns strobe pulses with 150µs latency for output update.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 4.5V - supports single-cell Li-ion battery operation without external LDO pre-regulation. |
| Max Total Output Current | 500mA - enables simultaneous MAIN display backlight (4 × 25mA) and high-current CAM flash (400mA). |
| Charge Pump Modes | 1x / 1.5x / 2x - auto-switching preserves efficiency; 1x mode delivers lowest noise and highest efficiency when VBAT ≥ LED VF + dropout. |
| Main LED Current Range | 0.312mA to 20mA per channel (8 steps, exponential) - provides 64:1 dimming ratio for smooth display backlight control. |
| CAM LED Current Range | 54mA to 380mA (8 steps, linear) - delivers precise high-current flash intensity control with 380mA absolute maximum. |
| Shutdown Current | 3µA typical - minimizes battery drain during idle periods in portable imaging systems. |
| Operating Frequency | 800kHz fixed - enables use of small 2.2µF ceramic flying/output capacitors and reduces EMI compared to lower-frequency pumps. |
Pinout & Package
The LTC3210EUD#TRPBF is housed in a thermally enhanced 3mm × 3mm, 16-lead plastic QFN package (UD) with exposed pad (Pin 17) that must be soldered to PCB ground for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1P, C2P, C1M, C2M (Pins 1, 16, 14, 13) | Flying capacitor connections | Interface with external 2.2µF ceramic capacitors to enable charge transfer in 1.5x/2x modes; polarity reversal during startup forbids polarized caps. |
| CPO (Pin 2) | Charge pump output rail | Common anode supply for all LEDs; regulated at VBAT (1x), 4.55V (1.5x), or 5.05V (2x); short-circuit tolerant with indefinite duration. |
| ENM, ENC (Pins 3, 10) | Digital brightness control inputs | Edge-triggered strobes decrement internal DACs; 150µs latency to update current; both low ≥150µs initiates shutdown. |
| MLED1–MLED4 (Pins 4–7) | Main LED cathode current sinks | Four independent 25mA low-dropout (100mV) current sources; each can be disabled by tying to CPO (10µA leakage). |
| CLED (Pin 11) | Camera LED cathode current sink | Single 400mA low-dropout (500mV) current source with dedicated linear DAC control via ENC. |
| RM, RC (Pins 8, 9) | Current programming reference nodes | Internal 1.215V servo points; resistors to GND set full-scale MLED/CLED currents; ≤12kΩ triggers overcurrent shutdown. |
| VBAT (Pin 15) | Main power input | Accepts 2.9–4.5V; requires local 2.2µF low-ESR ceramic bypass; supplies internal circuitry and flying capacitor charging path. |
| GND (Pin 12) | Power and signal reference | Low-impedance ground plane connection required; exposed pad (Pin 17) is electrically and thermally GND. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI and board space for inductors-critical for noise-sensitive camera modules and slim mobile form factors. |
| Automatic mode switching | Real-time dropout detection triggers seamless 1x→1.5x→2x transitions without software intervention or external control logic. |
| Open/short LED protection | Integrated fault detection disables affected outputs and prevents damage during LED string failure or PCB trace opens. |
| Internal soft-start | Linear 150µs ramp of CPO current during mode changes suppresses inrush transients and avoids supply droop in battery-powered systems. |
| Thermal shutdown | 150°C junction limit with hysteresis prevents permanent damage during sustained high-current CAM flash operation. |
Applications
| Smartphone Camera Flash | Tablet Display Backlight |
|---|---|
Use Scenario: High-intensity illumination for low-light photo capture using dual-LED or quad-LED flash arrays. IC Role / Device Role / Timing Role: LTC3210EUD#TRPBF acts as the primary CAM LED current controller and voltage booster, delivering up to 400mA with linear 8-step intensity control via ENC strobes. Use Value: Enables consistent, calibrated flash output across varying battery voltages (2.9–4.5V) without external regulators or complex firmware sequencing. | Use Scenario: Uniform edge-lit backlight for 7–10 inch LCD panels in tablets and portable media players. IC Role / Device Role / Timing Role: LTC3210EUD#TRPBF serves as MAIN LED driver, powering four parallel 25mA channels with exponential dimming for smooth brightness transitions. Use Value: Provides 64:1 dimming range and low-noise constant-frequency operation-eliminating visible PWM flicker and audible coil whine in user-facing displays. |
| Digital Still Camera (DSC) | Portable Medical Imaging Device |
Use Scenario: Compact, battery-operated digital cameras requiring integrated flash and display backlight in minimal PCB area. IC Role / Device Role / Timing Role: LTC3210EUD#TRPBF integrates both MAIN and CAM LED drivers in one QFN, reducing BOM count and simplifying layout versus discrete solutions. Use Value: Single-chip solution cuts component count by ≥50% vs dual-driver ICs while maintaining independent current control and protection for each LED string. | Use Scenario: Handheld dermatoscopes or ophthalmoscopes needing reliable, low-EMI illumination for clinical image capture. IC Role / Device Role / Timing Role: LTC3210EUD#TRPBF functions as certified medical-grade LED driver with open/short LED fault reporting and stable current regulation under variable battery conditions. Use Value: Built-in protection and <3µA shutdown current extend battery life between clinical sessions while ensuring repeatable light output for diagnostic consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-output boost LED driver (max 400mA), no MAIN/CAM separation; requires external PWM for dimming. | Lacks independent MAIN/CAM control and exponential dimming; suited for simpler flash-only designs. | Select when only CAM flash is needed and system-level PWM control is available. |
| MAX16823ATL+T | High-voltage buck-boost LED driver (up to 36V), supports >1A output but requires inductor and external MOSFETs. | Designed for automotive or industrial LED arrays-not optimized for mobile battery voltage or QFN footprint. | Choose for higher-power or wide-input applications where inductor-based topology is acceptable. |
Compared with TPS61165DRVR and MAX16823ATL+T, the LTC3210EUD#TRPBF uniquely integrates dual-path (MAIN + CAM) control, no-inductor operation, and mixed exponential/linear dimming in a 3mm × 3mm QFN-making it the only direct-fit solution for space-constrained mobile camera modules requiring both display backlight and flash functionality.
Availability
LTC3210EUD#TRPBF is available at Aetrix Electronics and suitable for smartphone camera flash systems, tablet display backlights, digital still cameras, portable medical imaging devices, and handheld barcode scanners requiring stable component supply and long-term production continuity.
Supply support for LTC3210EUD#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, 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 LTC3210EUD#TRPBF belongs to ADI's Power Management product line, engineered specifically for portable imaging applications where low EMI, high integration, and battery-efficient LED driving are critical design requirements.
FAQ
What is the maximum continuous CAM LED current supported by the LTC3210EUD#TRPBF?
The LTC3210EUD#TRPBF supports up to 380mA continuous CAM LED current at full-scale setting (with RC = 24.3kΩ), and is rated for 400mA peak. The datasheet specifies 450mA absolute maximum for CLED under ≤10% duty cycle for <10 seconds; for continuous operation, 300mA is the recommended limit to ensure thermal reliability. The LTC3210EUD#TRPBF achieves this using its internal linear DAC and low-dropout (500mV) current source architecture.
How does the LTC3210EUD#TRPBF handle LED open-circuit faults?
The LTC3210EUD#TRPBF detects open-circuit conditions on MLED or CLED outputs by monitoring current flow: if test current falls below 4µA (typical) and threshold voltage exceeds 0.5V, the part disables the affected output and continues normal operation on remaining channels. This fault detection is implemented in hardware with no software dependency. The LTC3210EUD#TRPBF remains functional during such events, preserving system reliability in camera modules where LED string integrity is critical.
Can the LTC3210EUD#TRPBF drive MAIN and CAM LEDs simultaneously?
Yes, the LTC3210EUD#TRPBF is explicitly designed to drive all five LED outputs-four MAIN (MLED1–MLED4) and one CAM (CLED)-simultaneously from a common CPO rail. Its charge pump dynamically adjusts mode (1x/1.5x/2x) based on the worst-case dropout condition across any enabled output, ensuring stable voltage headroom for all active channels. The LTC3210EUD#TRPBF maintains independent current control for MAIN and CAM paths via separate ENM/ENC strobes and RM/RC programming resistors.
What is the purpose of the exposed pad (Pin 17) on the LTC3210EUD#TRPBF package?
The exposed pad (Pin 17) on the LTC3210EUD#TRPBF is electrically connected to GND and serves dual thermal and electrical functions: it must be soldered to a large PCB copper plane tied to the main ground plane via multiple vias to dissipate heat during high-current CAM LED operation and to provide low-impedance return paths for high-frequency switching currents. Thermal resistance θJA is specified at 68°C/W only when the exposed pad is properly connected; omitting this connection degrades thermal performance and risks premature thermal shutdown. The LTC3210EUD#TRPBF relies on this pad for safe operation at full 400mA load.
Does the LTC3210EUD#TRPBF require external components beyond capacitors and resistors?
No, the LTC3210EUD#TRPBF requires only four 2.2µF ceramic flying/output capacitors (C1P/C1M, C2P/C2M, CPO, and VBAT bypass) and two precision current-setting resistors (RM and RC) to operate as a complete LED power solution-no inductors, diodes, or external MOSFETs are needed. All control logic, charge pump switches, DACs, protection circuits, and soft-start circuitry are fully integrated. This minimal external BOM reduces cost, board area, and EMI risk. The LTC3210EUD#TRPBF achieves this through its proprietary switched-capacitor architecture and on-die regulation.
LTC3210EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3210EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3210EUD#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 LTC3210EUD#TRPBF reliable?
The price and inventory of LTC3210EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3210EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3210EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3210EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3210EUD#TRPBF?
LTC3210EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3210EUD#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 LTC3210EUD#TRPBF?
For technical support, including LTC3210EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3210EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3210EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3210EUD#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 LTC3210EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3210EUD#TRPBF?
All LTC3210EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3210EUD#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 LTC3210EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3210EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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