描述 Description

Please note: this product is being discontinued and is not recommended for new designs.

The AAT3176A is a high output current, high efficiency, low noise, low profile charge pump converter IC, ideal for multi-function LED photo-flash applications where solution cost, size, and efficiency are critical. The charge pump is capable of delivering up to 500mA of output current and can be easily programmed in 16 steps with a single GPIO output through AnalogicTech's S2Cwire? (Simple Serial Control) interface. This allows smooth transitions and flexible adjustment of brightness in flash or other lighting modes. Operating at a fast 1MHz switching frequency, the dual-mode (1x/2x) operation of the internal charge pump offers excellent power efficiency for both flash and movie modes and combined with a low external parts count (one 1μF flying capacitors and small bypass capacitors at VIN and OUT), the AAT3176A is ideally suited for small, battery-powered applications.

The maximum current for both Flash and Movie mode is set by two independent external resistors. The MODE pin is adopted to select the LED current between Movie (Torch) and Flash mode.

The AAT3176A has a thermal management system to protect the device in the event of short-circuit, open-circuit, and over-temperature condition. Built-in soft-start circuitry prevents excessive in-rush current during startup. The shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1.0μA.

The AAT3176A is available in the 2.2 x 2.2mm Pb-free 10-pin TDFN package.

特性 Features

? 2.7V to 5.5V Supply Voltage Range
? Up to 500mA Output Drive Capability at 3.6V VIN
? Flexible Brightness Control
? 16 Step Output Current by S2Cwire
? Separate External Resistors to Set Maximum Flash and Movie-Mode Current
? Dual Mode 1x/2x Charge Pump
? < 1.0μA in Shutdown
? Small Application Circuit
? Automatic Soft-Start Limits Inrush Current
? Open and Short Circuit Protection
? Thermal Shutdown Protection
? -40 to +85°C Temperature Range
? 10-pin TDFN2.2x2.2 Package

簡介

AAT3176A屬于集成電路（IC）的LED驅動器。由制造生產(chǎn)的AAT3176ALED 驅動器器件屬于 LED 驅動器電源管理集成電路 (PMIC) 系列，可通過標稱固定電壓的電源為負載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪ζ骷ぷ鼽c進行外部控制，可在照明應用中用于實現(xiàn)調光功能。