Analog Devices Inc. LTC3207EUF-1#TRPBF

Overview

LTC3207EUF-1#TRPBF from Analog Devices (formerly Linear Technology) is a highly integrated multi-output LED/CAM driver IC featuring a low-noise, multi-mode charge pump and twelve 27.5mA universal current sources plus one 425mA camera LED current source. It supports I²C-controlled linear brightness (6-bit for ULEDs, 4-bit for CAM), independent blinking/gradation, and automatic 1x/1.5x/2x mode switching - designed for QVGA+ display backlighting and flash in mobile video phones.

For engineers reviewing the LTC3207EUF-1#TRPBF datasheet, LTC3207EUF-1#TRPBF pinout, LTC3207EUF-1#TRPBF application, or LTC3207EUF-1#TRPBF equivalent, key selection considerations include its dual I²C address (00110100), 24-pin 4mm × 4mm QFN package, 425mA CAM current source with 2-second safety timer, and slew-limited switching for EMI-sensitive handheld designs.

Technical Context

The LTC3207EUF-1#TRPBF implements a 850kHz fixed-frequency, non-overlapping 2-phase switched-capacitor charge pump with automatic dropout-triggered mode transitions: 1x (VBAT → CPO), 1.5x (target 4.55V), and 2x (target 5.05V). Mode reset occurs on I²C register update, CAMHL falling edge, or gradation completion.

It integrates twelve 6-bit DAC-controlled universal current sources (0–27.5mA, ±2% matching) and one 4-bit CAM current source (0–425mA), both with programmable dropout voltage thresholds (180mV ULED, 450mV CAM), internal soft-start, and short-circuit/thermal protection - all operating from 2.9V to 5.5V VBAT and 1.5V to 5.5V DVCC.

Key Specifications

Pinout & Package

24-pin 4mm × 4mm plastic QFN (UF package) with exposed thermal pad (Pin 25) soldered to PCB ground. Pin pitch: 0.5mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1698EUB+T and TPS61165DRVR, the LTC3207EUF-1#TRPBF uniquely integrates twelve independently controllable ULED channels, dedicated CAM flash control with safety timer, and automatic charge pump mode switching - making it the only solution capable of consolidating MAIN/SUB/RGB/CAM lighting into a single IC for advanced mobile displays.

Availability

LTC3207EUF-1#TRPBF is available at Aetrix Electronics and suitable for mobile video phone backlighting, smartphone camera flash systems, automotive infotainment displays, and portable medical imaging devices requiring stable component supply and long-term lifecycle support.

Supply support for LTC3207EUF-1#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 LTC3207EUF-1#TRPBF belongs to ADI's precision LED driver product line, engineered specifically for space-constrained, EMI-sensitive mobile and portable electronics requiring multi-channel, high-accuracy current regulation and intelligent power management.

FAQ

What is the I²C address of the LTC3207EUF-1#TRPBF?

The LTC3207EUF-1#TRPBF uses the fixed 7-bit I²C slave address 00110100 (0x34 in hexadecimal). This distinguishes it from the LTC3207 (00110110 / 0x36), allowing both variants to coexist on the same I²C bus. The address is hardwired and not software-configurable. All register writes and reads for the LTC3207EUF-1#TRPBF must use this address to ensure correct communication with the intended device.

How does the LTC3207EUF-1#TRPBF handle overtemperature conditions?

The LTC3207EUF-1#TRPBF incorporates internal thermal protection that activates when junction temperature exceeds 125°C. Upon detection, the device disables all current sources and enters thermal shutdown, holding CPO at its last regulated voltage until temperature falls below the hysteresis threshold. Recovery is automatic and does not require a power cycle. This safeguard prevents permanent damage during sustained high-current operation or poor PCB thermal design, ensuring robust reliability for the LTC3207EUF-1#TRPBF in thermally constrained mobile enclosures.

Can the ULED outputs of the LTC3207EUF-1#TRPBF be used as general-purpose open-drain outputs?

Yes, the ULED1–ULED12 outputs of the LTC3207EUF-1#TRPBF can be configured as I²C-controlled open-drain general-purpose outputs (GPOs). This is enabled by setting Bits 6 and 7 of the corresponding REG1–REG12 registers to logic '1'. In GPO mode, dropout detection is disabled, and the outputs swing to ground when active. Each ULED pin retains its 27.5mA current capability, making them suitable for driving logic inputs, small LEDs, or MOSFET gates - extending the utility of the LTC3207EUF-1#TRPBF beyond LED driving alone.

What is the purpose of the CAMHL pin on the LTC3207EUF-1#TRPBF?

The CAMHL pin on the LTC3207EUF-1#TRPBF selects between two independent 4-bit current registers for the CAM output: asserting CAMHL high enables the high-current register (e.g., for flash), while low selects the low-current register (e.g., for preview illumination). Critically, the falling edge of CAMHL resets the charge pump to 1x mode and clears the 2-second safety timer - enabling rapid, hardware-triggered flash activation without I²C bus overhead. If unused, CAMHL must be tied to GND to prevent floating-state instability in the LTC3207EUF-1#TRPBF.

Does the LTC3207EUF-1#TRPBF require external inductors?

No, the LTC3207EUF-1#TRPBF does not require external inductors. It uses a switched-capacitor charge pump architecture with four external ceramic capacitors (C1, C2, C3 = 2.2µF; C4 = 4.7µF) to generate boosted output voltages (1x, 1.5x, 2x). This eliminates inductor-related EMI, size, cost, and saturation concerns - a key differentiator for noise-sensitive, space-constrained applications like mobile handsets where the LTC3207EUF-1#TRPBF is commonly deployed.