PM8903ATR STMicroelectronics

PM8903A 3 A step-down monolithic switching regulator Datasheet production data Features Integrated 35 m MOSFETs for high efficiency 3 A continuous output current 2.8 V to 6 V input voltage (V ) IN 2.9 V to 5.5 V supply voltage (V ) CC Adjustable output voltage down to 0.6 V 1% output voltage accuracy 1.1 MHz switching frequency operation VFQFPN16 (3 x 3 mm) PSKIP mode to optimize light load efficiency Embedded bootstrap diode Thermally compensated loss-less current The PM8903A features low-resistance integrated sense across HS and LS MOSFETs nMOS and proprietary pulse-skipping mode for optimum efficiency over all the loading range. OV/UV/OC and overtemperature protection Internal soft-start and soft-stop The voltage mode control loop allows the widest range of output filters. Current sense is internally Interleaving synchronization (up to 2 ICs) thermally compensated for optimum precision. Power Good output The integrated 0.6 V reference allows the Shutdown function (< 15 A quiescent current) regulation of output voltages with 1% accuracy VFQFPN16 3 x 3 mm compact package over temperature variations. Switching frequency is typically set to 1.1 MHz and can be programmed to 0.8 MHz or 1.0 MHz. Out of phase Applications synchronization allows the reduction of input RMS Subsystem power supply current. CPU, DSP and FPGA power supplies The PM8903A provides precise dual-threshold Distributed power supply overcurrent protection as well as over/undervoltage and overtemperature General DC-DC converters protection. PGOOD output easily provides real- time information on the output voltage. Description The PM8903A is available in VFQFPN16 3 x 3 The PM8903A is a high efficiency monolithic step- mm. down switching regulator designed to deliver up to 3 A continuous current. The IC operates from 2.8 V to 6 V input voltage (V ). IN Table 1. Device summary Order codes Package Packaging PM8903A VFQFPN16 (3 x 3 mm) Tube PM8903ATR VFQFPN16 (3 x 3 mm) Tape and reel January 2013 Doc ID 024147 Rev 1 1/33 This is information on a product in full production. www.st.com 33Contents PM8903A Contents 1 Typical application circuit and block diagram 3 1.1 Application circuit 3 1.2 Block diagram . 3 2 Pin description and connection diagrams . 4 2.1 Pin description 4 3 Thermal data . 6 4 Electrical specifications 7 4.1 Absolute maximum ratings . 7 4.2 Recommended operating conditions . 7 4.3 Electrical characteristics . 7 4.4 Typical operating characteristics 9 5 Device description . 12 5.1 Power section 12 5.2 Startup and shutdown management 13 5.2.1 Low-side-less startup . 14 5.2.2 Soft-off 14 5.3 Output voltage monitoring and protection 14 5.3.1 Overvoltage protection 14 5.3.2 Undervoltage protection . 15 5.3.3 Feedback disconnection protection 15 5.3.4 Power Good (PGOOD) . 15 5.4 Overcurrent protection . 16 5.5 Overtemperature protection . 16 5.6 Synchronization 16 5.7 Pulse-skipping . 17 5.8 Multifunction pin PSKIP/MS . 17 6 Application information . 18 6.1 Compensation network 18 2/33 Doc ID 024147 Rev 1