RT9167 PDF

The output voltages range from 1. The output remains stable even with 1? F ceramic output capacitor. The shutdown mode of nearly zero operation current makes the IC suitable for battery-power devices.

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The output voltages range from 1. The output remains stable even with 1? F ceramic output capacitor. The shutdown mode of nearly zero operation current makes the IC suitable for battery-power devices. Other features include a reference bypass pin to improve low noise performance, current limiting, and over temperature protection.

A Typical? GND Current? A Output Voltage V 3. Output Current Current Limit vs. The input capacitor must be located a distance of not more than 0. Any good quality ceramic or tantalum can be used for this capacitor. Output capacitor of larger capacitance can reduce noise and improve load-transient response, stability, and PSRR. The output capacitor should be located not more than 0. It may be necessary to use 2.

Also, tantalum capacitors, 2. F or more may be needed to maintain capacitance and ESR in the stable region for strict application environment. Tantalum capacitors maybe suffer failure due to surge current when it is connected to a low-impedance source of power like a battery or very large capacitor.

If a tantalum capacitor is used at the input, it must be guaranteed to have a surge current rating sufficient for the application by the manufacture. Use a 10nF bypass capacitor at BP for low output voltage noise.

The capacitor, in conjunction with an internal K? Increasing the capacitance will slightly decrease the output noise, but increase the start-up time.

The capacitor connected to the bypass pin for noise reduction must have very low leakage. This capacitor leakage current causes the output voltage to decline by a proportional amount to the current due to the voltage drop on the internal K? It provides several advantages over similar designs using PNP pass transistors, including longer battery life. PNP-based regulators waste considerable current in dropout when the pass transistor saturates.

They also use high base-drive currents under large loads. A of quiescent current whether in dropout, light-load, or heavy-load applications. In battery-powered systems, this will determine the useful end-of-life battery voltage. If the output is forced above the input by more than a diode-drop, this diode will become forward biased and current will flow from the VOUT terminal to VIN.

This diode will also be turned on by abruptly stepping the input voltage to a value below the output voltage. As shown, the Schottky diode is connected in parallel with the internal parasitic diode and prevents it from being turned on by limiting the voltage drop across it to about 0.

The DC shift is quite small due to the excellent load regulation of the IC. Typical output voltage transient spike for a step change in the load current from 0mA to 50mA is tens mV, depending on the ESR of the output capacitor. When the junction Fig. The output can be shorted to ground for an indefinite amount of time without damaging the part by cooperation of current limit and thermal protection.

Connect the GND pin to ground using a large pad or ground plane. Headquarter 6F, No. Taipei Office Marketing 8F-1, No. Tel: Fax: Email: marketing richtek-ic.

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