描述 Description

The AAT1217 a high efficiency, synchronous, fixed frequency, step-up converter designed for single-cell or dual-cell alkaline, NiMH, or NiCd battery-powered applications. The high 1.2MHz switching frequency and completely integrated control circuitry minimize the total solution footprint area while maintaining excellent regulation, ripple, and transient response throughout the full load range.
Pulse skipping mode operation and low quiescent current allow the AAT1217 to maintain high efficiency performance for light load and sleep mode conditions. With a 1.2A peak switch current limit, the AAT1217 is capable of delivering 100mA to the load from a single AA cell or up to 400mA from dual AA cells.
The AAT1217 has a 0.85V start-up voltage with operation down to 0.5V. The AAT1217 is available in a Pb-free, space-saving low profile (1mm) 6-pin TSOT23 package and is rated over the -40°C to +85°C ambient temperature range.

特性 Features

·VOUT Range: 2.5V to 5.5V
·100mA Output from a Single AA Cell Input
·400mA Output from a Dual AA Cell Input
·High Efficiency: Up to 93% Efficiency
·Low Start-Up Voltage: 0.85V Typical
·Internal Synchronous Rectifier
·VOUT ≤ 4.5V: No External Schottky Diode
·Fixed Frequency Pulse Width Modulation (PWM)Current-Mode Control Scheme with Internal Compensation
·1.2MHz Fixed Switching Frequency
·1.2A Current Limit
·Light Load Pulse Skipping Mode Operation
·Low 80μA No Load Input Current
·Over-Current Protection
·EMI Reduction Anti-Ringing Control Circuitry
·Low Shutdown Current: <1.0μA
·-40°C to +85°C Ambient Temperature Range
·Low Profile (1mm) TSOT23-6 Package

簡(jiǎn)介

AAT1217屬于集成電路（IC）的穩(wěn)壓器-DC-DC開關(guān)穩(wěn)壓器。由制造生產(chǎn)的AAT1217穩(wěn)壓器 - DC-DC 開關(guān)穩(wěn)壓器DC-DC 開關(guān)穩(wěn)壓器 PMIC（電源管理集成電路）產(chǎn)品族中的產(chǎn)品是元器件級(jí)設(shè)備，用于需要穩(wěn)定 DC 輸入電壓和/或?qū)⑵滢D(zhuǎn)換為不同幅度的輸出電壓的應(yīng)用。這些器件與稱為“控制器”PMIC 的類似產(chǎn)品的區(qū)別在于集成了主開關(guān)元件，設(shè)備提供的電力會(huì)通過該元件。