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MAX8887EZK29 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX8887EZK29 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 9 page put capacitors with an ESR of 0.1 Ω or less to ensure sta- bility and optimum transient response. Surface-mount ceramic capacitors have very low ESR and are com- monly available in values up to 10µF. Connect CIN and COUT as close to the MAX8887/MAX8888 as possible to minimize the impact of PC board trace inductance. Noise, PSRR, and Transient Response The MAX8887/MAX8888 are designed to operate with low dropout voltages and low quiescent currents in bat- tery-powered systems while still maintaining excellent noise, transient response, and AC rejection. See the Typical Operating Characteristics for a plot of power- supply rejection ratio (PSRR) versus frequency. When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. Input-Output (Dropout) Voltage A regulator’s minimum input-to-output voltage differen- tial (dropout voltage) determines the lowest usable sup- ply voltage at which the output is regulated. In battery-powered systems, this determines the useful end-of-life battery voltage. The MAX8887/MAX8888 use a P-channel MOSFET pass transistor. Its dropout volt- age is a function of drain-to-source on-resistance (RDS(ON)) multiplied by the load current (see the Typical Operating Characteristics). VDROPOUT = VIN - VOUT = RDS(ON) ✕ IOUT Chip Information TRANSISTOR COUNT: 620 PROCESS: BiCMOS Low-Dropout, 300mA Linear Regulators in SOT23 _______________________________________________________________________________________ 7 SHUTDOWN LOGIC ERROR AMP 1.25V REF 95% REF P OUT POK GND IN SHDN MAX8888 THERMAL SENSOR MOS DRIVER WITH ILIMIT POK Figure 1. Functional Diagram 0 100 200 300 400 0 1.0 2.0 3.0 0.5 1.5 2.5 3.5 4.0 MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) (VIN - VOUT) (V) MAXIMUM RECOMMENDED OUTPUT CURRENT TA = +85 °C TA = +70 °C Figure 2. Power Operating Regions: Maximum Output Current vs. Input Voltage |
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