AN30180A VIN = 2.5V to 5.5V 1.2A Synchronous DC-DC Step Down Regulator FEATURES DESCRIPTION z Wide output voltage range : 1.15V to 2.80V AN30180A is a synchronous DC-DC Step Down z Input voltage range : 2.5V to 5.5V Regulator and employs the hysteretic control system. z Up to 1200mA Output Current By this system, when load current charges suddenly, it z Load transient response is fast responds at high speed and minimizes the changes of z Output current limit control of 1.8A to prevent output voltage. Excessive current flows Since it is possible to use capacitors with small z High efficiency over a wide load current area by capacitance and it is unnecessary to add external parts DCM (discontinuous conductive mode) operation for system phase compensation, this IC realizes at light loads, CCM (continuous conductive mode) downsizing of set and reducing in the number of external operation in heavy loads those two modes can be parts. automatically switched z Switching frequency of 2.6MHz during CCM. z 100% duty operation when input voltage goes APPLICATIONS down to output voltage. High Current Distributed Power Systems such as z 9 pin Wafer level chip size package (WLCSP Type) power amplifier in cellular phone etc. Size : 1.46 1.46 mm ( 0.5 mm pitch) SIMPLIFIED APPLICATION EFFICIENCY CURVE 100 90 80 70 CNT1 CNT2 60 VIN PVIN 50 FB 40 VIN=2.50V 1.0 H AVIN 30 VOUT VIN=3.70V 4.7 F x 2 VIN=5.50V LX 20 AN30180A 4.7 F 10 0 EN 1 10 100 1000 AGND PGND Load Current mA Condition : V =2.5V , 3.7V , 5.5V, Vout=1.15V , Cout=4.7F , Lout=1.0H IN Notes) This application circuit is an example. The operation of mass production set is not guaranteed. You should perform enough evaluation and verification on the design of mass production set. You are fully responsible for the incorporation of the above application circuit and information in the design of your equipment. Ver. AEB Publication date: October 2012 1 Efficiency % AN30180A ABSOLUTE MAXIMUM RATINGS Parameter Symbol Rating Unit Notes *1 Supply voltage V 6.0 V IN *3 Operating free-air temperature T 30 to + 85 C *2 opr Operating junction temperature T 40 to + 150 C *2 j Storage temperature T 55 to + 150 C *2 stg *1 Input Voltage Range FB,EN,CTL1,CTL2 0.3 to (V + 0.3) V IN *3 *1 Output Voltage Range LX 0.3 to (V + 0.3) V IN *3 ESD HBM (Human Body Model) 2 kV - Notes) Do not apply external currents and voltages to any pin not specifically mentioned. This product may sustain permanent damage if subjected to conditions higher than the above stated absolute maximum rating. This rating is the maximum rating and device operating at this range is not guaranteeable as it is higher than our stated recommended operating range. When subjected under the absolute maximum rating for a long time, the reliability of the product may be affected. *1:The values under the condition not exceeding the above absolute maximum ratings and the power dissipation. *2:Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25C. *3:V is voltage for AVIN, PVIN. AVIN = PVIN,(V + 0.3) V must not be exceeded 6 V. IN IN POWER DISSIPATION RATING PACKAGE PD(Ta=25C) PD(Ta=85C) Notes JA 9pin Wafer level chip size package 436 C /W 0.286 W 0.148 W *1 (WLCSP Type) Note). For the actual usage, please refer to the PD-Ta characteristics diagram in the package specification, follow the power supply voltage, load and ambient temperature conditions to ensure that there is enough margin and the thermal design does not exceed the allowable value. *1:Glass Epoxy Substrate(4 Layers) Glass-Epoxy: 50 X 50 X 0.8t(mm) Die Pad Exposed , Soldered. CAUTION Although this has limited built-in ESD protection circuit, but permanent damage may occur on it. Therefore, proper ESD precautions are recommended to avoid electrostatic damage to the MOS gates Ver. AEB 2