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MAX8863SEUK-T Datasheet(PDF) 4 Page - ON Semiconductor |
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MAX8863SEUK-T Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 12 page MAX8863 http://onsemi.com 4 DETAILED DESCRIPTION The MAX8863 is a fixed output, low–dropout, low–quiescent current linear regulator designed specifically for portable, battery–operated equipment such as cellular phones, cordless phones, and modems. A 1.20 V reference, error amplifier, MOSFET driver, P–channel pass transistor, comparator, and internal feedback voltage divider comprise the MAX8863 (see Figure 3). The bandgap reference is connected to the error amplifier’s inverting input. The error amplifier then compares the reference with the selected feedback voltage and amplifies the difference. The MOSFET driver, reading the error signal, applies the correct drive to the P–channel pass transistor. If the feedback voltage is lower than the reference, the pass–transistor is pulled lower to allow more current through, and to increase the output voltage. Conversely, if the feedback voltage is higher than the reference, the pass–transistor is pulled up, which allows less current through to the output. Turn On Response The turn on response is defined as two separate response categories, Wake Up Time (tWK) and Settling Time (tS). The MAX8863 has a fast Wake Up Time (10 µsec typical) when released from shutdown. See Figure 2 for the Wake Up Time designated as tWK. The Wake Up Time is defined as the time it takes for the output to rise to 2.0% of the VOUT value after being released from shutdown. VOUT SHDN VIL tWK 98% 2% tS VIH Figure 2. Wake Up Response Time The total turn on response is defined as the Settling Time (tS), see Figure 2. Settling Time (inclusive with tWK) is defined as the condition when the output is within 2.0% of its fully enabled value (140 µsec typical) when released from shutdown. The settling time of the output voltage is dependent on load conditions and output capacitance on VOUT (RC response). Internal P–Channel Pass Transistor Featuring a 1.1 Ω P–channel MOSFET pass transistor, the MAX8863 offers longer battery life than similar designs using PNP pass transistors, which waste current in dropout when the pass transistor saturates. PNP–based regulators also use high base–drive currents under large loads. The P–channel MOSFET, however, does not require a base drive current, which reduces quiescent current. The MAX8863 uses only 50 µA of quiescent current. SHDN – + MOS DRIVER WITH ILIMIT THERMAL SENSOR 1.2 V REF SHUTDOWN LOGIC IN GND GND OUT P N (MAX8863 Only) Figure 3. Functional Block Diagram |
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