Analog Devices Inc. LTC3210EUD-1#PBF

Overview

LTC3210EUD-1#PBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump LED driver IC designed to power four 25mA MAIN display LEDs and one 400mA CAM LED in mobile imaging systems. It features automatic 1x/1.5x/2x mode switching, 64-step linear brightness control for MAIN outputs, and independent current programming via external resistors RM and RC. It operates from 2.9V to 4.5V VBAT and delivers up to 500mA total output current.

For engineers reviewing the LTC3210EUD-1#PBF datasheet, LTC3210EUD-1#PBF pinout, LTC3210EUD-1#PBF application, or LTC3210EUD-1#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated QFN-16 pin functions, confirmed alternative options with documented differences, and supply-chain support details for camera lighting subsystems in smartphones and DSCs.

Technical Context

The LTC3210EUD-1#PBF implements a constant-frequency (800kHz) switched-capacitor charge pump with automatic dropout-based mode transitions: it powers up in 1x pass-through mode, switches to 1.5x (VCPO = 4.55V) when any MAIN LED current source drops out below 75mV, and escalates to 2x (VCPO = 5.05V) upon further dropout. Regulation is achieved by sensing CPO voltage and modulating pump strength via internal open-loop output resistance (ROL), which varies with temperature and load.

LED current control uses two independent digital-analog architectures: a 6-bit linear DAC (64 steps, 0–20mA per MAIN output with RM = 30.1kΩ) controlled by ENM strobes, and a 3-bit linear DAC (8 steps, 0–380mA on CLED with RC = 24.3kΩ) controlled by ENC strobes. Both DACs feature 150µs settling time and soft-start-limited enable timing (50–250µs).

Key Specifications

Pinout & Package

Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Requires soldering 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 MAX8630YETE+T and TPS61165DRVR, the LTC3210EUD-1#PBF uniquely integrates dual-path (MAIN+CAM), automatic mode optimization, and high-resolution linear dimming in a single QFN package-making it irreplaceable for space-constrained, low-EMI mobile camera subsystems requiring both display backlight and flash control.

Availability

LTC3210EUD-1#PBF is available at Aetrix Electronics and suitable for smartphone camera modules, digital still cameras, and PDA display backlighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for LTC3210EUD-1#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and consumer markets.

The LTC3210EUD-1#PBF belongs to Linear's precision LED driver product line, engineered specifically for low-noise, high-efficiency camera lighting in battery-powered portable devices where size, thermal performance, and EMI compliance are critical.

FAQ

What is the maximum allowable current per MAIN LED output on the LTC3210EUD-1#PBF?

The LTC3210EUD-1#PBF supports up to 25mA per MAIN LED output (MLED1–MLED4) under absolute maximum ratings. However, the typical full-scale current is 20mA when using RM = 30.1kΩ, and the device guarantees 481–589A/A current ratio accuracy across temperature. Exceeding 25mA risks triggering overcurrent shutdown or thermal limiting.

How does the LTC3210EUD-1#PBF switch between 1x, 1.5x, and 2x charge pump modes?

The LTC3210EUD-1#PBF starts in 1x mode (VBAT directly connected to CPO). When any enabled MAIN or CAM LED current source detects dropout-defined as insufficient headroom (<75mV for MAIN, <500mV for CAM)-the IC automatically transitions to 1.5x mode (target VCPO = 4.55V). A second dropout event triggers 2x mode (target VCPO = 5.05V). Mode reset occurs on ENC falling edge or shutdown.

Can the LTC3210EUD-1#PBF drive LEDs with forward voltages exceeding 5.05V?

No. The LTC3210EUD-1#PBF's maximum regulated CPO voltage is 5.05V in 2x mode. Driving LEDs with combined VF + dropout voltage >5.05V will cause persistent dropout, excessive power dissipation in current sources, and potential thermal shutdown. It is designed for white LEDs with VF ≤3.8V at rated current (e.g., Nichia NSCW100, AOT-2015HPW).

What is the purpose of the exposed pad (Pin 17) on the LTC3210EUD-1#PBF QFN package?

The exposed pad (Pin 17) on the LTC3210EUD-1#PBF is electrically and thermally connected to GND. It must be soldered to a large PCB copper area tied to the main ground plane via multiple thermal vias. This reduces θJA from 68°C/W to ~40°C/W, prevents thermal shutdown at full load, and lowers high-frequency noise coupling into sensitive analog nodes like RM/RC.

Does the LTC3210EUD-1#PBF support I²C or other digital interfaces for brightness control?

No. The LTC3210EUD-1#PBF uses dedicated logic-level strobe inputs (ENM and ENC) for brightness control-no I²C, SPI, or PMBus interface is present. MAIN brightness is adjusted by counting positive edges on ENM (up to 63 for minimum current); CAM brightness uses ENC (up to 7 edges). This eliminates MCU firmware dependencies and reduces pin count in resource-constrained designs.