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Analog Devices Inc. LTC3210EUD-3#TRPBF
- Part No.:
- LTC3210EUD-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3210EUD-3#TRPBF.pdf
- Description:
- IC LED DRV RGLTR /400MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,146
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Product details
Overview
LTC3210EUD-3#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump DC/DC converter IC designed to drive three MAIN LEDs and one high-current CAM LED in mobile camera lighting systems. It delivers up to 20mA per MAIN output and 380mA to the CAM output, features 32-step linear brightness control for MAIN LEDs, operates from 2.9V–4.5V input, and uses automatic 1x/1.5x/2x mode switching to maintain regulation across varying LED forward voltages - deployed in cellphone, DSC, and PDA camera modules.
For engineers reviewing the LTC3210EUD-3#TRPBF datasheet, LTC3210EUD-3#TRPBF pinout, LTC3210EUD-3#TRPBF application, or LTC3210EUD-3#TRPBF equivalent, key selection criteria include its 3mm × 3mm QFN-16 package, dual independent current programming (ENM/ENC), open/short LED protection, 800kHz fixed-frequency operation, and absence of inductors - critical for compact, low-EMI portable lighting designs.
Technical Context
The LTC3210EUD-3#TRPBF implements a switched-capacitor charge pump with three operating modes (1x, 1.5x, 2x), regulated via internal voltage comparators that detect dropout at MLED/CLED pins and trigger automatic mode transitions within 400µs. Its 5-bit linear DAC controls MAIN LED current in 32 discrete steps (0–20mA), while a separate 3-bit DAC sets CAM LED current in 8 steps (0–380mA).
Current programming is achieved via external resistors RM and RC, which servo to 1.215V; full-scale MAIN current = (1.215V/(RM + 500Ω)) × 525, full-scale CAM current = (1.215V/(RC + 500Ω)) × 7700. The device integrates soft-start, thermal shutdown (~150°C), and 3µA shutdown current, with all logic inputs (ENM/ENC) compatible with 1.4V VIH and 0.4V VIL thresholds.
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 LDO pre-regulation. |
| MAIN LED Output Current | Up to 20mA per channel (MLED1–MLED3), set by RM resistor and 5-bit DAC - enables precise, flicker-free display backlighting. |
| CAM LED Output Current | Up to 380mA on CLED pin, set by RC resistor and 3-bit DAC - sufficient for high-intensity flash illumination in smartphone cameras. |
| Charge Pump Modes | Automatic 1x (VBAT→CPO), 1.5x (up to 4.55V), 2x (up to 5.05V) - eliminates need for manual mode selection or external control logic. |
| Switching Frequency | 800kHz fixed frequency - allows use of small 2.2µF ceramic flying/output capacitors and minimizes audible noise. |
| Shutdown Current | 3µA max - preserves battery life during idle periods in portable devices. |
| Package | 16-lead 3mm × 3mm QFN with exposed thermal pad - provides low thermal resistance (θJA = 68°C/W) and space-efficient mounting. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN (UD package), exposed pad (Pin 17) connected to GND for thermal and electrical performance.
| 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 pump energy transfer; polarity-insensitive due to AC operation. |
| CPO (Pin 2) | Charge pump output node | Common anode supply for all LEDs; voltage dynamically adjusted to 1x/1.5x/2x VBAT depending on load demand and dropout detection. |
| ENM (Pin 3), ENC (Pin 10) | Digital current programming inputs | Strobe-controlled logic inputs: ENM toggles 5-bit MAIN DAC (32 steps), ENC toggles 3-bit CAM DAC (8 steps); both low >150µs triggers shutdown. |
| MLED1–MLED3 (Pins 4–6) | MAIN LED current sink outputs | Three independent, matched current sources (±0.5% matching) for driving MAIN display/backlight LEDs cathode-side. |
| NC (Pin 7) | No-connect terminal | Not internally bonded - may be left floating or tied to GND; distinguishes LTC3210-3 from LTC3210-2 (which uses Pin 7 as MLED4). |
| RM (Pin 8), RC (Pin 9) | Current programming reference pins | Internal 1.215V reference nodes; external resistors to GND set full-scale MAIN/CAM currents per defined formulas. |
| CLED (Pin 11) | CAM LED current sink output | High-current (up to 380mA) sink for camera flash LED; shares CPO anode but operates independently from MAIN outputs. |
| GND (Pin 12) | Power and signal ground | Low-impedance return path for all currents; must connect to solid ground plane and exposed pad. |
| VBAT (Pin 15) | Main power input | Accepts 2.9V–4.5V battery supply; requires local 2.2µF ceramic bypass capacitor to minimize input ripple and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| 32-step linear MAIN brightness control | Enables smooth, non-logarithmic dimming for display backlighting without external PWM or microcontroller intervention. |
| Independent MAIN/CAM current programming | Allows simultaneous but separate adjustment of display and flash intensity using only two digital strobe lines and two resistors. |
| Automatic 1x/1.5x/2x mode switching | Maintains LED regulation across wide VF variation (e.g., cold vs. hot white LEDs) without firmware or external sensing circuitry. |
| Open/short LED fault protection | Prevents damage and system failure by disabling outputs when open-circuit or short-circuit conditions are detected on MLED/CLED pins. |
| No inductors required | Reduces BOM cost, board area, and EMI concerns compared to inductive boost converters - ideal for ultra-thin mobile PCBs. |
Applications
| Cellphone Camera Flash | Portable DSC Backlight |
|---|---|
Use Scenario: High-intensity illumination for smartphone rear/front camera capture in low-light conditions. IC Role / Device Role / Timing Role: CAM LED current source delivering up to 380mA with 8-level programmable brightness via ENC strobes. Use Value: Enables consistent flash output across battery voltage range (3.0–4.2V) via automatic 1.5x/2x mode boosting, eliminating underexposed images. | Use Scenario: Powering 3-white-LED main display in digital still cameras with adjustable brightness. IC Role / Device Role / Timing Role: MAIN LED driver providing matched 20mA per channel with 32-step linear dimming via ENM strobes. Use Value: Delivers flicker-free, uniform backlighting with minimal PCB footprint - no inductors or complex control required. |
| PDA Main Display Lighting | Compact Medical Imaging Module |
Use Scenario: Bright, adjustable front-panel display illumination in handheld PDAs used in industrial or field environments. IC Role / Device Role / Timing Role: Triple MAIN LED current sink with independent current setting and thermal protection. Use Value: Maintains stable brightness over temperature (-40°C to 85°C) and battery discharge, with <0.5% current matching between channels. | Use Scenario: Low-noise, space-constrained LED illumination for endoscopic or dermatological imaging tools. IC Role / Device Role / Timing Role: Charge pump LED driver with 800kHz fixed-frequency operation and minimal conducted EMI. Use Value: Meets stringent EMC requirements in medical electronics by avoiding inductor-based switching noise and enabling clean analog sensor readings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8647ETE+T | 4-channel MAIN + 1-channel CAM driver; same 3mm × 3mm TQFN-16 package; 32-step MAIN DAC but 4-bit CAM DAC (16 steps); requires external I²C interface for programming. | Requires microcontroller I²C bus access; less suitable for standalone strobe-based control. | Choose MAX8647ETE+T when I²C configurability and higher CAM resolution are needed; avoid if pin-strapped simplicity is prioritized. |
| TPS61165DRVR | Single-output boost LED driver with analog/PWM dimming; no integrated MAIN/CAM separation; supports up to 400mA but only one channel; uses inductor-based topology. | Lacks multi-output architecture and automatic mode switching; introduces inductor-related EMI and size penalty. | Choose TPS61165DRVR only for single-LED flash applications where inductor use is acceptable and dual-path control is unnecessary. |
Compared with MAX8647ETE+T and TPS61165DRVR, the LTC3210EUD-3#TRPBF uniquely combines true dual-path (MAIN+CAM) control, inductorless operation, and hardware-only strobe programming - reducing firmware dependency and PCB complexity in battery-powered imaging systems.
Availability
LTC3210EUD-3#TRPBF is available at Aetrix Electronics and suitable for cellphone camera modules, portable DSC backlighting, and PDA display lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3210EUD-3#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3210EUD-3#TRPBF belongs to Linear's legacy LED driver product line, engineered specifically for space-constrained, battery-operated imaging devices demanding high efficiency, low noise, and simplified system integration without inductors or complex digital interfaces.
FAQ
What is the maximum total output current supported by the LTC3210EUD-3#TRPBF?
The LTC3210EUD-3#TRPBF supports up to 20mA per MAIN LED output (MLED1–MLED3) and up to 380mA on the CAM LED output (CLED), for a total of 440mA. Continuous operation above 300mA is limited by thermal constraints; the datasheet specifies 300mA as the maximum continuous current under absolute maximum conditions. The LTC3210EUD-3#TRPBF includes thermal shutdown at ~150°C to protect against sustained overload.
How does the LTC3210EUD-3#TRPBF achieve automatic mode switching between 1x, 1.5x, and 2x?
The LTC3210EUD-3#TRPBF monitors voltage headroom at each enabled LED current source. When dropout is detected - i.e., insufficient voltage across a current source to maintain programmed current - it automatically transitions from 1x to 1.5x mode (~400µs delay), then to 2x mode if further dropout occurs. The LTC3210EUD-3#TRPBF resets to 1x mode upon shutdown (ENM = ENC = low) or falling edge of ENC. Regulation voltages are fixed at VCPO = 4.55V (1.5x) and 5.05V (2x).
Can the LTC3210EUD-3#TRPBF drive four MAIN LEDs like the LTC3210-2 variant?
No. The LTC3210EUD-3#TRPBF is the -3 variant and has NC (no-connect) on Pin 7, whereas the LTC3210-2 uses Pin 7 as MLED4. The LTC3210EUD-3#TRPBF supports exactly three MAIN LED outputs (MLED1–MLED3). Attempting to drive a fourth MAIN LED would require substituting the LTC3210EUD-2#TRPBF or redesigning the LED string configuration. The LTC3210EUD-3#TRPBF datasheet explicitly states "MLED4 (Pin 7, LTC3210-2 Only)".
What external components are mandatory for basic operation of the LTC3210EUD-3#TRPBF?
Four mandatory external components are required: two 2.2µF ceramic flying capacitors (C1, C2), one 2.2µF ceramic output capacitor (CCPO), and two current-setting resistors (RM for MAIN, RC for CAM). A 2.2µF ceramic bypass capacitor on VBAT is also required. Polarized capacitors (tantalum/aluminum) must not be used for flying capacitors due to voltage reversal risk. The LTC3210EUD-3#TRPBF functions without inductors, microcontrollers, or additional ICs.
Does the LTC3210EUD-3#TRPBF provide protection against LED open or short circuits?
Yes. The LTC3210EUD-3#TRPBF includes built-in open/short LED protection on all current outputs (MLED1–MLED3 and CLED). If an open or short condition is detected, the affected output is disabled to prevent damage and excessive power dissipation. The device continues normal operation on unaffected channels. This protection is implemented in hardware and requires no external circuitry - a key reliability feature confirmed in the Absolute Maximum Ratings and Applications Information sections of the LTC3210EUD-3#TRPBF datasheet.
LTC3210EUD-3#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:
- 4
- 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-3#TRPBF FAQ
1.How can I place an order for LTC3210EUD-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3210EUD-3#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-3#TRPBF reliable?
The price and inventory of LTC3210EUD-3#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-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3210EUD-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3210EUD-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3210EUD-3#TRPBF?
LTC3210EUD-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3210EUD-3#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-3#TRPBF?
For technical support, including LTC3210EUD-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3210EUD-3#TRPBF requirements.
6.How does Aetrix verify that LTC3210EUD-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3210EUD-3#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-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3210EUD-3#TRPBF?
All LTC3210EUD-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3210EUD-3#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-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3210EUD-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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