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MAX15027 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX15027 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 10 page Capacitor Selection and Regulator Stability Capacitors are required at the MAX15027/MAX15028’s inputs and outputs for stable operation over the full temperature range and with load currents up to 1A. Connect a 1µF capacitor between IN and ground and a 4.7µF capacitor with low equivalent series resistance (ESR) between OUT and ground for 1A output current. The input capacitor (CIN) lowers the source impedance of the input supply. If input supply source impedance is high, place a larger input capacitor close to IN to pre- vent VIN sagging due to load transients. Smaller output capacitors can be used for output currents less than 1A. Calculate the minimum COUT as follows: Operating Region and Power Dissipation The maximum power dissipation depends on the ther- mal resistance of the IC package and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipat- ed in the device is PDISS = IOUT (VIN - VOUT). The package features an exposed thermal pad on its underside. This pad lowers the thermal resistance of the package by providing a direct heat conduction path from the die to the PCB. Connect the exposed backside pad and GND to the system ground using a large pad or ground plane and multiple vias to the ground plane layer. Noise, PSRR, and Transient Response The MAX15027/MAX15028 are designed to operate with low-dropout voltages and low quiescent currents while still maintaining good noise performance, tran- sient 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 MAX15027/MAX15028 load-transient response graphs (see the Typical Operating Characteristics) 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 current from 300mA to 800mA is 15mV. Use ceramic output capacitors greater than 4.7µF (up to 100µF) to attenuate the overshoot. Layout Guidelines The TDFN package has an exposed thermal pad on its underside. This pad provides a low thermal resistance path for heat transfer into the PCB. This low thermally resistive path carries a majority of the heat away from the IC. The PCB is effectively a heatsink for the IC. The exposed pad should be connected to a large ground plane for proper thermal and electrical performance. The minimum size of the ground plane is dependent upon many system variables. To create an efficient path, the exposed pad should be soldered to a thermal landing, which is connected to the ground plane by thermal vias. The thermal landing should be at least as large as the exposed pad. CI F A OUT OUT MAX =× ⎛ ⎝⎜ ⎞ ⎠⎟ () . 1 025 µ 1.425V to 3.6V Input, 1A Low-Dropout Regulators with BIAS Input _______________________________________________________________________________________ 9 |
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