AAT1109A

Advanced Analog Technology, Inc. AAT1109A Preliminary and Provisional ONE-CHANNEL BOOST SWITCHING REGULATOR Features z z z z z z z z Under-voltage lockout protection Totem pole output Output short circuit protection Incorporates soft start function Wide operating frequency¡G 10kHz to 1MHz Shut down control Low dissipation current : Typical 1.6mA in operation Sop-8 & Tssop-8 package available General Description The AAT1109A is a one-channel switching regulator control IC incorporating a soft start function and a short circuit protection function. Each device consists of an on-chip voltage reference, error amplifier, pulse width modulation controller, under-voltage protection, soft start and short circuit protection circuits. Switching frequencies up to 1MHz are set by an external resistor and capacitor. Soft-start time can be implemented by the SCP capacitor. Additionally, a chip enable feature is provided to power down reducing the supply current to 10uA. With a minimum number of external components, the AAT1109A offers a simple and cost effective solution. Pin Configuration TOP VIEW -IN SCP Vcc CE 1 2 3 4 8 7 6 5 FB OSC GND OUT (SOP-8 PACKAGE) (TSSOP-8 PACKAGE) – – x ¥ ÆWÃþ¤ñ¬ì§ÞªÑ¥÷¦³-½q – Advanced Analog Technology, Inc. – V 0.1 Advanced Analog Technology, Inc. AAT1109A Pin Description Pin # 1 2 3 4 5 6 7 8 Name -IN SCP Vcc CE OUT GND OSC FB I/O Description I Error amplifier inverting input pin I Soft start and SCP capacitor connection pin Power supply I Chip enab...