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MAX8532EBTG Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX8532EBTG Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP 6 _______________________________________________________________________________________ Current Limit The MAX8532 contains an independent current limiter, which monitors and controls the pass transistor’s gate voltage, limiting the output current to 210mA (min). The output can be shorted to ground indefinitely without damaging the part. Thermal-Overload Protection Thermal-overload protection limits total power dissipa- tion in the MAX8532. When the junction temperature exceeds TJ = +160°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allow- ing the IC to cool. The thermal sensor turns the pass transistor on again after the IC’s junction temperature cools by 10°C, resulting in a pulsed output during contin- uous thermal-overload conditions. Thermal-overload protection is designed to protect the MAX8532 in the event of fault conditions. For continual operation, do not exceed the absolute maximum junc- tion temperature rating of TJ = +150°C. Operating Region and Power Dissipation The MAX8532’s maximum power dissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the airflow rate. The power dissi- pation across the device is P = IOUT (VIN - VOUT). Maximum power dissipation: PMAX = (TJ - TA)/( θJB + θBA) where TJ - TA is the temperature difference between the MAX8532 die junction and the surrounding air, θJB (or θJC) is the thermal resistance of the package, and θBA is the thermal resistance through the printed circuit board, copper traces, and other materials, to the surrounding air. Low-Noise Operation An external 0.01µF bypass capacitor at BP, in conjunc- tion with an internal resistor, creates a lowpass filter. The MAX8532 exhibits 40µVRMS output voltage noise with CBP = 0.01µF and COUT = 2.2µF (see the Output Noise Spectral Density vs. Frequency graph in the Typical Operating Characteristics). Applications Information Capacitor Selection and Regulator Stability Use a 2.2µF capacitor on the MAX8532’s input. Larger input capacitor values with lower ESR provide better supply-noise rejection and line-transient response. To reduce noise and improve load transients, use large output capacitors up to 10µF. For stable operation over the full temperature range and with rated maximum load currents, use a minimum of 2.2µF (or 1µF for <150mA loading) for OUT. Note that some ceramic dielectrics exhibit large capac- itance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, use 4.7µF or more to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 2.2µF is sufficient at all operating temperatures. These regulators are optimized for ceramic capacitors. Tantalum capacitors are not rec- ommended. PSRR and Operation from Sources Other than Batteries The MAX8532 is designed to deliver low dropout volt- ages and low quiescent currents in battery-powered sys- tems. Power-supply rejection is 62dB at low frequencies (see the Power-Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics). When operating from sources other than batteries, improve supply-noise rejection and transient response by increasing the values of the input and output bypass capacitors and through passive filtering techniques. |
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