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MAX1726EUK18-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1726EUK18-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 7 page pass transistor shuts off, the output falls to ground, and supply current drops from 2µA to 0.7µA. Connect SHDN to IN for normal operation. If reverse-battery protection is needed, drive SHDN through a 100k Ω resistor. Thermal-Overload Protection Thermal-overload protection limits total power dissipa- tion in the MAX1725/MAX1726. When the junction tem- perature exceeds TJ = +150°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor turns the pass transistor on again after the IC’s junction tem- perature cools by 15°C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection is designed to protect the devices in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150°C. Foldback Current Limiting The MAX1725/MAX1726 also include a foldback current limiter. When the output is shorted to ground, the output PMOS drive is limited so that the output current does not exceed 40mA (typ). The output can be shorted to ground indefinitely without damaging the part. Reverse-Battery Protection The MAX1725/MAX1726 have a unique protection scheme that limits the reverse supply current to less than 10µA when VIN is forced below ground. The cir- cuitry monitors the polarity of the input, disconnecting the internal circuitry and parasitic diodes when the battery is reversed. This feature prevents the device, battery, and load from overheating and electrical stress. For reverse-battery protection, drive SHDN through a 100k Ω resistor. Applications Information Capacitor Selection and Regulator Stability For general purposes, use a 1µF capacitor on the MAX1725/MAX1726 input and output. Larger input capacitor values and lower ESR provide better supply- noise rejection and transient response. A higher-value input capacitor (10µF) may be necessary if large, fast transients are anticipated and the device is located sev- eral inches from the power source. For stable operation over the full temperature range, use a minimum of 1µF on the output. Output Voltage Selection For fixed 1.8V, 2.5V, 3.3V, or 5V output voltages, use the MAX1726. The MAX1725 features an adjustable output voltage from 1.5V to 5V, using two external resistors connected as a voltage-divider to FB (Figure 1). The MAX1725 is optimized for operation with R2 = 1.2M Ω. The output voltage is set by the following equation: where typically VFB = 1.245V. To simplify resistor selec- tion: Choose R2 = 1.2M Ω for best accuracy. Power-Supply Rejection and Operation from Sources Other than Batteries The MAX1725/MAX1726 are designed to deliver low dropout voltages and low quiescent currents in battery- powered systems. Power-supply rejection is 60dB at low frequencies and rolls off above 100Hz. At high frequen- cies, the output capacitor is the major contributor to the rejection of power-supply noise (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 value of the input and output capaci- tors, and by using passive filtering techniques (see the Supply and Load Transient Response graph in the Typical Operating Characteristics). 12V, Ultra-Low IQ, Low-Dropout Linear Regulators 6 _______________________________________________________________________________________ Chip Information TRANSISTOR COUNT: 112 GND FB (GND) OUT 15 SHDN IN MAX1725 MAX1726 SOT23-5 TOP VIEW 2 34 ( ) ARE FOR MAX1726 ONLY. Pin Configuration VV R R OUT FB =+ 1 1 2 RR V V OUT FB 12 1 = − |
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