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TPS78228DDCR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS78228DDCR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page APPLICATION INFORMATION APPLICATION EXAMPLES BOARD LAYOUT RECOMMENDATIONS TO TPS78227 GND EN IN OUT V IN V OUT 1 F m 1 F m 4.2Vto5.5V 2.7V On Off INTERNAL CURRENT LIMIT INPUT AND OUTPUT CAPACITOR TPS782xx www.ti.com ........................................................................................................................................... SBVS115A – AUGUST 2008 – REVISED SEPTEMBER 2008 The TPS782 series are designed to be stable with standard ceramic capacitors with values of 1.0 µF or larger at the output. X5R- and X7R-type capacitors The TPS782 family of LDOs is factory-programmable are best because they have minimal variation in value to have a fixed output. Note that during startup or and ESR over temperature. Maximum ESR should be steady-state conditions, it is important that the EN pin less than 1.0 Ω. With tolerance and dc bias effects, voltage never exceed VIN + 0.3V. the minimum capacitance to ensure stability is 1 µF. IMPROVE PSRR AND NOISE PERFORMANCE To improve ac performance (such as PSRR, output noise, and transient response), it is recommended that the printed circuit board (PCB) be designed with separate ground planes for VIN and VOUT, with each ground plane connected only at the GND pin of the device. In addition, the ground connection for the output capacitor should connect directly to the GND pin of the device. High ESR capacitors may degrade PSRR. Figure 21. Typical Application Circuit The TPS782 is internally current-limited to protect the REQUIREMENTS regulator during fault conditions. During current limit, the output sources a fixed amount of current that is Although an input capacitor is not required for largely independent of output voltage. For reliable stability, it is good analog design practice to connect operation, the device should not be operated in a a 0.1 µF to 1.0µF low equivalent series resistance current limit state for extended periods of time. (ESR) capacitor across the input supply near the regulator. This capacitor counteracts reactive input The PMOS pass element in the TPS782 series has a sources and improves transient response, noise built-in body diode that conducts current when the rejection, and ripple rejection. A higher-value voltage at OUT exceeds the voltage at IN. This capacitor may be necessary if large, fast rise-time current is not limited, so if extended reverse voltage load transients are anticipated, or if the device is not operation is anticipated, external limiting to 5% of located near the power source. If source impedance rated output current may be appropriate. is not sufficiently low, a 0.1 µF input capacitor may be necessary to ensure stability. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 9 |
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