LD3980 Low drop - Low supply voltage Low ESR capacitor compatible Feature summary Input voltage from 1.7 to 3.6V Ultra low dropout voltage (130mV typ. at 300mA load) Very low quiescent current (110A typ. at no load, 130A max. at 300mA load max 0.5A in DFN6 (3x3) OFF MODE) Output voltage tolerance: +/- 1.0% 25C, +/- ultra low drop-voltage, low quiescent current and 2.0% full temperature range low noise makes it suitable for low power Guaranteed output current up to 300mA applications and in battery powered systems. High power supply rejection is maintained down Wide range of output voltage: 0.8V to 3.0V to low input voltage levels common to battery Logic-controlled electronic shutdown operated circuits. Shutdown Logic Control Compatible with ceramic capacitor C = 1F O function is available this means that when the device is used as local regulator, it is possible to Internal current and thermal limit put a part of the board in standby, decreasing the Temperature range: -40C to 85C total power consumption. The device also includes a constant current limiting and thermal Description overload protection. Typical applications are in mobile phone, personal digital assistant (PDAs), The LD3980 provides up to 300mA, from 1.7V to cordless phone and similar battery powered 3.6V input voltage. It can deliver a guaranteed wireless systems, portable information 300mA continuous load current with a low 100mV appliances.. dropout. It is stable with ceramic capacitor. The Block diagram December 2006 Rev. 1 1/16 www.st.com 16 Obsolete Product(s) - Obsolete Product(s)LD3980 Contents 1 Pin configuration . 3 2 Maximum ratings 4 3 Typical application 5 4 Electrical characteristics . 6 5 Typical characteristics . 7 6 Detailed description . 9 6.1 Shutdown 9 6.2 Current limit 9 6.3 Thermal overload protection 9 6.4 Power dissipation 9 6.5 Output capacitance . 10 7 Package mechanical data 11 8 Order code . 14 9 Revision history . 15 2/16 Obsolete Product(s) - Obsolete Product(s)