B4251

Bay Linear Inspire the Linear Power 250mA Low Dropout Voltage Regulators ON/OFF & BYPASS B4251 Description The B4251 series are a group of positive output voltage, five-pin regulators, which provide a high current even when the input/output voltage differential is small. Low power consumption and high accuracy is achieved though CMOS and programmable fuse technologies. Output voltage: 2.0V to 6.0V in 0.1V increments. The B4251 consists of a high-precision voltage reference, an error correction circuit, and a current limited output driver. Key features include a Shutdown Pin that reduces supply current to 0.5µA max and a 470pF Bypass input to ground reduces noise present on the internal reference, which in turn significantly reduce output noise. If output noise is not concern, this input maybe left unconnected. Larger capacitor values cap be used, but results in longer time period to rated output voltage when power initially applied. The ON/OFF pin enables the output to be turned off, resulting in reduced power consumption. Provided in SOT-25 (150mW) packages minimizes the usage of board real state. Features • • • • • • • • • • Maximum Output Current: 250 mA. Highly Accurate Output Voltage +/- 1.4% Only 19µA Power Consumption MAX Shutdown Supply Current 1µA Ground Current of Less than 5µA Very Low Dropout 0.12V at 100mA 0.23V at 250mA Shutdown Mode for Power Savings With ON/OFF & BYPASS Features Offered in SOT-89 & SOT-25 Packages PIN-to-PIN S-818 Applications • • • • • Battery Powered Equipment Notebook PC, Palmtops, PDA Portable Cameras and Video Recorders Reference Voltage Sources Cellular / GSM / PCS Phones Pin Connection Ordering Information Package SOT-25 SOT-89 Part No. B4251CK5-X.X B4251CR-X.X SOT-25 (K5) SOT-89 (R) X.X = Fixed Output Voltages from 2.0V to 6.0V Vout 5 1 2 Bypass 4 3 Vout 5 Vss 4 ON/OFF (Enable) Function Part No B4251 ON/Off High Low VOUT ON OFF 1 2 3 Vin ON/OFF GND NC Vin On/Off Top View Top View Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B4251 Absolute Maximum Ratings Parameter Input Voltage Output Current Output Voltage On/Off Voltage Continual Total Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VIN IOUT VOUT On/Off SOT-25 SOT-89 Pd TOPR TSTG Ratings 12 500 VSS -0.3 to VIN 0.3 VSS -0.3 to VIN+ 0.3 150 300 -30 to 80 -40 to 125 Units V mA V V mW °C °C Electrical Characteristics (Ta = 25°C, VIN = VOUT + 0.5V; unless otherwise noted) Parameter Output Voltage Accuracy Line Regulation ∆VOUT/∆VIN-VOUT Load Regulation Maximum Output Current Current Limit Shutdown Supply Current Shutdown Input Bias Current Shutdown Exit Delay Shutdown Input Threshold Low Shutdown Input Threshold High Ground Pin Current Dropout Voltage Thermal Shutdown Temperature Conditions IO = 1mA IO = 0 to 150mA IO= 100mA, (VOUT + 0.1V)