Bay Linear Inspire the Linear Power B4500 500 mA Low Dropout Voltage Regulators Preliminary Information Description Features The B4500 series are a group of positive output voltage, three-pin regulators, that provide a high current even when the input/output voltage differential is small. Very low power consumption, only 2µA typ., and high accuracy is achieved though CMOS construction and programmable fuse technologies. Output voltage: 2.0V to 6.0V in 0.1V increments. • • • • The B4500 consists of a high-precision voltage reference, an error correction circuit, and a current limited output driver. Available in SOT223 (500mW) and SOT-89 (300mW) packages minimizing the usage of board real state. • Applications • • • • Pin Connection Maximum Output Current: 500 mA. Highly accurate: Output voltage +/- 2%. Only 2µ µA power Consumption. Very Low Dropout: 0.11V @ 100mA 0.3V @ 300mA 0.5V @ 450mA Offered in SOT-89 & SOT-223 Packages Battery Powered Equipment Notebook PC, Palmtops, PDA Portable Cameras and Video Recorders Reference Voltage Sources Ordering Information Package SOT-89 (R) SOT-223 (N) Part No. SOT-223 B4500CN-X.X SOT-89 B4500CR-X.X X.X = Fixed Output Voltages from 2.0V to 6.0V Vin Vin 2 2 1 2 1 3 3 Vss Vss 2 Vin Vout Vin Vout Top View Bay Linear, Inc Top View 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B4500 Absolute Maximum Ratings Parameter Input Voltage Output Current Output Voltage Continual Total Power Dissipation Symbol VIN IOUT VOUT SOT-223 SOT-89 Operating Ambient Temperature Storage Temperature Pd TOPR TSTG Ratings 6.5 800 VSS -0.3 to VIN 0.3 500 300 -30 to 80 -40 to 125 Units V mA V mW °C °C Electrical Characteristics (Ta = 25°°C, VIN = VOUT + 0.5V; unless otherwise noted) Parameter Output Voltage Line Regulation ∆VOUT/∆VIN-VOUT Load Regulation Maximum Output Current Current Limit Ground Pin Current Dropout Voltage Conditions IO = 0mA IO = 0 to 500mA IO =100mA, (VOUT + 0.1V)<VIN<6V VIN =6V, 0mA < IO < 500mA COUT = 1µF MIN -1.4% -2% MAX +1.4% +2% UNIT 0.2 0.3 %/V 0.04 %/mV 500 900 IOUT = 100mA IO = 100mA IO = 300 mA IO = 500 mA Thermal Shutdown Temperature Bay Linear, Inc TYP - 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 V mA 2 110 300 450 155 6 160 450 µA mV °C www.baylinear.com B4500 PRODUCT DESCRIPTION The B4500 is precision fixed output voltage regulator. Unlike bipolar regulators, the B4500 supply current does not increase with load current. In addition, Vout remains stable and within regulator at very low load currents (an important consideration in RTC and CMOS RAM battery back-up application). Figure 1 shows a typical application circuit. The regulator is enabled any time the shutdown input is at or above VIH. And shutdown (disabled) when SHDN is at or below VIL. SHDN maybe controlled by a CMOS logic gate, or I/O port of a micro controller. If the SHDN input is not. Required, it should be connected directly to the supply. While in shutdown, supply current decreases to 0.05µA (typical) and Vout falls to zero volts. Output Capacitor A 1µF (min) capacitor from Vout to ground is required. Then output capacitor should have an effective series resistance of 5Ω or less. A 1µA capacitor should be connected from Vin to GND if there is more than 10 inches of wire between the regulator and the AC filter capacitor, or if a battery is used as the power source. Aluminum electrolytic or tantalum capacitor types can be used. (since many aluminum electrolytic capacitors freeze at approximately- 30°C, solid tantalums are recommended for applications operating below –25 °C.) When operating from sources other than batteries, supply-noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. PD=(VINMAX-VOUTMIN)ILOADMAX Where: PD= worst case actual power dissipation VINMAX= Maximum voltage on VIN VOUTMIN=Minimum regulator output voltage ILOADMAX= maximum output (LOAD) Current The maximum allowable power dissipation is function of the maximum ambient temperature (TAMAX). The maximum allowable die temperature (125°C) and the thermal resistance from junction-to-air (θJA). PDMAX=(TJMAX-TAMAX)/ θJA Where all terms are previously defined This can be caused in conjunction with other equation to ensure regulator thermal operation is within limit. For example: Given: VINMAX=3.3V+10% VOUTMIN=2.7V-2.5% ILOADMAX=275 mA TJMAX=125°C TAMAX=95°C θJA= 59°C/W Find: 1. Actual power dissipation 2. Maximum allowable dissipation Thermal Considerations Thermal Shutdown Integrated thermal protection circuitry shuts the regulator off when die temperature exceeds 160°C. The regulator remaining off until the die temperature drops to approximately 140 °C. VIN VOUT C1 1µF C2 1µF B4500 BATTREY GND Power Dissipation The amount of power the regulator dissipates is primarily a function of input and output voltage, and output current. The following equation is used to calculate worst case power dissipation: Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com B4500 C A J N P 2 1 3 K B F D G -T- Bay Linear, Inc STYLE 1 PIN 1. BASE 2. COLLECTOR 3. EMITTER STYLE 3 PIN 1. GATE 2. ANODE 3. CATHODE STYLE 2 PIN 1. ANODE 2. CATHODE 3. NO CONNECTION STYLE 4 PIN 1. DRAIN 2. GATE 3. SOURCE DIM A B C D E F G J K L N P MILLIMETERS MIN MAX 4.40 4.60 2.29 2.60 140 160 0.36 0.48 1.62 1.80 0.44 0.53 150 BSC 0.35 0.44 0.80 1.04 300 BSC 2.04 2.28 3.94 4.25 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 INCHES MIN MAX 0.174 0.181 0.091 0.102 0.056 0.062 0.015 0.018 0.064 0.070 0.018 0.020 0.059 BSC 0.014 0.017 0.032 0.040 0.118 BSC 0.081 0.089 0.156 0.167 www.baylinear.com B4500 Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations, computer simulations and/ or initial prototype evaluation. Preliminary Information- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges. The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application. LIFE SUPPORT AND NUCLEAR POLICY Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without the specific written consent of Bay Linear President. Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com