Analog Devices Inc. LTC3210EUD-2#PBF

Overview

LTC3210EUD-2#PBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump DC/DC converter IC designed to drive three or four MAIN white LEDs and one high-current CAM LED in mobile camera modules. It delivers up to 20mA per MAIN output (4-channel version), 380mA on CLED, features 32-step linear brightness control via ENM strobing, operates from 2.9V–4.5V VBAT, and uses only four 2.2µF ceramic capacitors and two external resistors. It targets cellphone/DSC/PDA front/rear camera lighting systems requiring compact, inductorless, low-EMI LED power.

For engineers reviewing the LTC3210EUD-2#PBF datasheet, LTC3210EUD-2#PBF pinout, LTC3210EUD-2#PBF application, or LTC3210EUD-2#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed 3mm × 3mm 16-lead QFN package mapping, real-world efficiency vs. VBAT data, and two manufacturer-validated alternative parts with documented functional and application differences.

Technical Context

The LTC3210EUD-2#PBF implements an automatic mode-switching charge pump with three operating modes-1x (direct pass-through), 1.5x, and 2x-triggered by LED current source dropout detection. It uses an internal 800kHz oscillator and nonoverlapping clock phases to drive flying capacitors (C1P/C1M, C2P/C2M), minimizing input/output ripple while enabling inductorless operation.

It integrates dual independent DAC-controlled current sources: a 5-bit linear DAC (32 steps, 0–20mA full-scale) for MAIN outputs (MLED1–MLED4), and a 3-bit linear DAC (8 steps, 0–380mA full-scale) for the CAM output (CLED). Both are programmed via edge-triggered logic inputs (ENM/ENC) with 150µs settling delay and built-in soft-start to limit inrush during mode transitions.

Key Specifications

Pinout & Package

Package: 16-lead (3mm × 3mm) plastic QFN (UD) with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with LTC3210EUD-3#PBF, the LTC3210EUD-2#PBF adds fourth MAIN channel without changing footprint or control logic; versus TPS61165DRVR, it trades inductor dependency for lower EMI and tighter integration - making it optimal for space-constrained, low-noise mobile camera lighting.

Availability

LTC3210EUD-2#PBF is available at Aetrix Electronics and suitable for cellphone front-camera flash, DSC main display backlight, PDA illumination, and smartphone dual-camera module applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for LTC3210EUD-2#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 acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC3210 series.

The LTC3210 family was designed specifically for mobile imaging and portable display LED power - prioritizing inductorless operation, low noise, automatic voltage mode adaptation, and dual-domain (MAIN + CAM) current control in sub-3mm² QFN packages.

FAQ

What is the maximum total output current supported by the LTC3210EUD-2#PBF?

The LTC3210EUD-2#PBF supports up to 20mA per MAIN output (4 × 20mA = 80mA) plus 380mA on CLED, yielding 460mA total. Absolute maximum ratings specify 500mA combined output, but continuous operation above 300mA requires derating per thermal design guidelines in the datasheet. The LTC3210EUD-2#PBF achieves this with its 3mm × 3mm QFN package and exposed thermal pad.

How does the LTC3210EUD-2#PBF handle LED forward voltage variation across temperature and aging?

The LTC3210EUD-2#PBF automatically switches between 1x, 1.5x, and 2x charge pump modes based on real-time dropout detection at each LED current source. As LED VF increases with temperature or degrades over time, the device detects insufficient headroom and transitions to higher gain modes - maintaining constant current without external feedback or MCU intervention. This behavior is intrinsic to the LTC3210EUD-2#PBF's analog regulation architecture.

Can the LTC3210EUD-2#PBF drive RGB LEDs with independent color control?

No - the LTC3210EUD-2#PBF provides only common-anode, cathode-sink current sources (MLED1–MLED4 and CLED) with shared CPO rail. It lacks independent voltage rails or PWM-capable channels required for RGB color mixing. Its design targets monochrome white LED arrays for illumination, not color-tunable backlighting. For RGB control, discrete drivers or dedicated RGB ICs are required instead of the LTC3210EUD-2#PBF.

What is the function of the exposed pad (Pin 17) on the LTC3210EUD-2#PBF?

The exposed pad (Pin 17) on the LTC3210EUD-2#PBF is electrically and thermally connected to GND. It must be soldered to a large PCB copper area tied to the system ground plane using multiple thermal vias. This ensures effective heat dissipation - critical for sustaining 380mA CLED output - and lowers impedance for high-frequency charge pump return currents, directly improving noise performance and stability of the LTC3210EUD-2#PBF.

Is the LTC3210EUD-2#PBF compatible with I²C or SPI interface for digital brightness control?

No - the LTC3210EUD-2#PBF uses dedicated logic inputs (ENM and ENC) for brightness control via pulse counting, not serial communication protocols. Brightness is adjusted by applying positive-going strobes (up to 31 for MAIN, 7 for CAM); no I²C/SPI controller, address lines, or software stack is involved. This simplifies integration in resource-constrained microcontrollers but means the LTC3210EUD-2#PBF cannot be reconfigured dynamically via firmware commands.