L6928Q1TR STMicroelectronics

L6928 High efficiency monolithic synchronous step-down regulator Datasheet - production data Applications Battery-powered equipment Portable instruments Cellular phones TSSOP8 VFQFPN8 PDAs and handheld terminals (3x3x1.0 mm) DSC GPS Features 2 V to 5.5 V battery input range Description High efficiency: up to 95% The device is a DC-DC monolithic regulator Internal synchronous switch specifically designed to provide high efficiency. No external Schottky diode required The L6928 supply voltage can be as low as 2 V Extremely low quiescent current to be used in single Li-Ion cell supplied 1 A max. shutdown supply current applications. Output voltage can be selected by 800 mA max. output current an external divider down to 0.6 V. Duty cycle can Adjustable output voltage from 0.6 V saturate 100% allowing low-dropout operation. Low-dropout operation: up to 100% duty The device is based on a 1.4 MHz fixed cycle frequency, current mode architecture. Low Selectable low noise/low consumption mode consumption mode operation can be selected at at light load light load conditions, allowing switching losses to Power Good signal be reduced. The L6928 is externally 1% output voltage accuracy synchronized by a clock, which makes it useful in noise sensitive applications. Other features like Current mode control Power Good, overvoltage protection, short-circuit 1.4 MHz switching frequency protection and thermal shutdown (150 C) are Externally synchronized from 1 MHz to 2 also present. MHz OVP Short-circuit protection Table 1: Device summary Order code Package Packing L6928D TSSOP8 Tube L6928D013TR TSSOP8 Tape and reel L6928Q1 VFQFPN8 Tube L6928Q1TR VFQFPN8 Tape and reel October 2016 DocID11051 Rev 9 1/21 www.st.com This is information on a product in full production. Contents L6928 Contents 1 Application circuit ........................................................................... 5 2 Pin configuration ............................................................................. 6 3 Maximum ratings ............................................................................. 7 4 Electrical characteristics ................................................................ 8 5 Detailed description ...................................................................... 10 5.1 Modes of operation ......................................................................... 10 5.1.1 Low consumption mode.................................................................... 10 5.1.2 Low noise mode ............................................................................... 11 5.1.3 Synchronization ................................................................................ 11 5.2 Short-circuit protection .................................................................... 11 5.3 Slope compensation ........................................................................ 12 5.4 Loop stability ................................................................................... 12 6 Additional features and description ............................................. 13 6.1 Dropout operation ........................................................................... 13 6.2 PGOOD ........................................................................................... 13 6.3 Adjustable output voltage ................................................................ 13 6.4 OVP (overvoltage protection) .......................................................... 13 6.5 Thermal shutdown ........................................................................... 13 7 Package information ..................................................................... 14 7.1 TSSOP8 package information ......................................................... 15 7.2 VFQFPN8 package information ...................................................... 17 8 Revision history ............................................................................ 20 2/21 DocID11051 Rev 9