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MAX1806EUA08 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1806EUA08 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 10 page 500mA, Low-Voltage Linear Regulator in µMAX _______________________________________________________________________________________ 9 response graphs (see Typical Operating Characteris- tics) show two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. A typical transient overshoot for a step change in the load cur- rent from 5mA to 500mA is 40mV. Increasing the output capacitor’s value and decreasing the ESR attenuates the overshoot. Input-Output (Dropout) Voltage A regulator’s minimum input-to-output voltage differen- tial (dropout voltage) determines the lowest usable sup- ply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX1806 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to- source on-resistance (RDS(ON)) multiplied by the load current (see Typical Operating Characteristics): VDROPOUT = VIN - VOUT = RDS(ON) ✕ IOUT Chip Information TRANSISTOR COUNT: 949 OUT OUT SET GND IN IN SHDN POK COUT 10 µF VOUT VOUT CIN 1 µF ON OFF R2 R1 = R2 - 1 0.8V MAX1806 R1 VIN +2.25V TO +5.5V Figure 2. Adjustable Output Using External Feedback Resistors Figure 3. Power Operating Regions: Maximum Output Current vs. Supply Voltage 0 0.2 0.1 0.3 0.6 0.7 0.5 0.4 0.8 0 1.0 1.5 2.0 2.5 0.5 3.0 3.5 4.0 4.5 5.0 INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V) POWER- µMAX PACKAGE OPERATING REGION AT TJ(MAX) = +150 °C TA = +85 °C TA = +70 °C TA = +50 °C CONTINUOUS CURRENT LIMIT TYPICAL VDROPOUT LIMIT |
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