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B4500CR Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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B4500CR Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 6 page Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 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 0.05 µA (typical) and V out falls to zero volts. Output Capacitor A 1 µF (min) capacitor from V out to ground is required. Then output capacitor should have an effective series resistance of 5 Ω 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. 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. 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: 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 ( θ JA). 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 θ JA= 59°C/W Find: 1. Actual power dissipation 2. Maximum allowable dissipation BATTREY C1 1 µF VIN GND VOUT C2 1 µF BATTREY C1 1 µF VIN GND VOUT C2 1 µF B4500 BATTREY C1 1 µF VIN GND VOUT C2 1 µF BATTREY C1 1 µF VIN GND VOUT C2 1 µF B4500 |
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