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MAX1589ETT075 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1589ETT075 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page capacitors to reduce noise and improve load-transient response, stability, and power-supply rejection. The output capacitor’s equivalent series resistance (ESR) affects stability and output noise. Use output capacitors with an ESR of 30m Ω or less to ensure sta- bility and optimize 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 MAX1589 as possible to minimize the impact of PC board trace inductance. Noise, PSRR, and Transient Response The MAX1589 is designed to operate with low dropout voltages and low quiescent currents in battery-powered systems, while still maintaining good noise, transient response, and AC rejection. See the Typical Operating Characteristics for a plot of Power-Supply Rejection Ratio (PSRR) vs. 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. The MAX1589 load-transient response (see the Typical Operating Characteristics) shows two components of the output response: a near-zero DC shift from the out- put impedance due to the load-current change, and the transient response. A typical transient response for a step change in the load current from 100mA to 500mA is 35mV. Increasing the output capacitor’s value and decreasing the ESR attenuates the overshoot. Input-Output (Dropout) Voltage A regulator’s minimum input-output voltage difference (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX1589 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source on-resis- tance (RDS(ON) = 0.33 Ω) multiplied by the load current (see the Typical Operating Characteristics): VDROPOUT = VIN - VOUT = 0.33 Ω ✕ IOUT The MAX1589 ground current reduces to 70µA in dropout. Chip Information TRANSISTOR COUNT: 2556 PROCESS: BiCMOS Low-Input-Voltage, 500mA LDO Regulator with R RE ES SE ET T in SOT and TDFN 8 _______________________________________________________________________________________ Figure 2. Power Operating Regions for 6-Pin SOT23: Maximum Output Current vs. Input Voltage MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) (VIN - VOUT) (V) 2.5 2.0 1.5 1.0 0.5 03.0 MAXIMUM RECOMMENDED OUTPUT CURRENT 6-PIN SOT23 TA = +85 °C TA = +70 °C 100 200 300 400 500 600 0 MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) (VIN - VOUT) (V) 2.5 2.0 1.5 1.0 0.5 03.0 MAXIMUM RECOMMENDED OUTPUT CURRENT 6-PIN TDFN TA = +85 °C 100 200 300 400 500 600 0 Figure 3. Power Operating Region for 6-Pin TDFN: Maximum Output Current vs. Input Voltage |
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