AX3513-V1.2.pdf

1/13 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.2 Jan.13, 2010 AX3513 1.4MHz, 1A Synchronous Step-Down Converter GENERAL DESCRIPTION AX3513 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version. Supply current with no load is 250uA and drops to 1uA in shutdown. The 2.5V to 6V input voltage range makes AX3513 ideally suited for single Li-Ion, two to four AA battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 1.4MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and decreases need of an external schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. AX3513 is available in small TSOT23-5L and DFN-6L packages. FEATURES - 2.5V to 6V Input Voltage Range - Output Voltage from 0.6V to VIN - High Efficiency: Up to 96% - 1.4MHz Constant Frequency Operation - Up to 1A Output Current - Quiescent Current: 250uA (Typical) - No Schottky Diode Required - Current Mode Operation for Excellent Line and Load Transient Response - Current limit, Enable function - Short Circuit Protect (SCP) - Build in soft start function - ≤ 1μA Shutdown Current - TSOT23-5L and DFN-6L Pb-Free packages 授权代理商：深圳市四海恒通科技有限公司 服务热线：0755-8398 3377 135 9011 2223 ww .go fot ec h.c om 2/13 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.2 Jan.13, 2010 AX3513 BLOCK DIAGRAM FB EN VIN SW GND Over-Temperature and Short-Circuit Protection REF Soft-Star 0.6V + - - + Icomp - + Isense AMP OSC SLOPECOMP PWM LOGIC - +