AAT3167数据手册Skyworks中文资料规格书

描述 Description

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

The AAT3167 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The AAT3167 is capable of driving five LEDs for a total of 135mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) make this part ideally suited for small battery-powered applications. AnalogicTech's AS²Cwire™ (Advanced Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 115µA. For optimized efficiency, low-current mode settings require only 50µA of housekeeping current. Each output of the AAT3167 is equipped with built-in protection for VOUT short-circuit and auto-disable for load short-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA.

The AAT3167 is available in a Pb-free, space-saving, thermally-enhanced, 16-pin, 3x4mm TDFN or 16-pin 4x4mm QFN package and is rated over the -40°C to +85°C temperature range.

Please note: AAT3167 is not recommended for new designs.

特性 Features

• VIN Range: 2.7V to 5.5V
• Fully Programmable Current with Single Wire
• 16-Step Logarithmic Scale
• 14/18/27mA Max Current
• Four Low Current Settings Down to 115µA
• Low IQ (50µA) for Single-Channel, Low-Current Mode
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage
• Drives up to Five LEDs
• Individual Main-Sub (4-1) Group Control
• No Inductors, Low Noise Operation
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Built-In Auto-Disable for Open Circuit
• Automatic Soft Start
• IQ <1µA in Shutdown
• TDFN34-16 or QFN44-16 Package