CS8101(2008) Просмотр технического описания (PDF) - ON Semiconductor

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Компоненты Описание

производитель

CS8101
(Rev.:2008)

Micropower 5.0 V, 100 mA Low Dropout Linear Regulator with RESET and ENABLE

ON Semiconductor 

CS8101

APPLICATION NOTES

VBAT

0.1 mF

500 kW

VIN

VOUT

CS8101

ENABLE GND RESET

RRST

CRST

VCC

COUT

mP

RESET

I/O Port

SWITCH

Q1

500 kW

100 kW

100 kW

Figure 6. Microprocessor Control of CS8101 Using External Switching Transistor Q1

The ENABLE pin of the CS8101 can be tied to the battery

voltage provided a series resistor is used as shown in Figure 7.

The maximum allowed voltage on the ENABLE pin without

the resistor is 10 V. Direct voltages greater than 10 V applied

to the pin without the series resistor may damage the device.

The system designer should note the turn−on threshold (typ

1.4 V) is on the ENABLE pin. The threshold will be higher

on the other side of RENABLE.

RENABLE

10 k

VBAT

ENABLE

ON/OFF

Control

60 k

0.64 V

50 k

Figure 7. Using the ENABLE pin with VBAT

STABILITY CONSIDERATIONS

The output or compensation capacitor helps determine

three main characteristics of a linear regulator: start−up

delay, load transient response and loop stability.

VIN

CIN*

0.1 mF

VOUT

CS8101

RESET

ENABLE

RRST

COUT**

10 mF

*CIN required if regulator is located far from the power supply filter.

*COUT required for stability. Capacitor must operate at

minimum temperature expected.

Figure 8. Test and Application Circuit Showing

Output Compensation

The capacitor value and type should be based on cost,

availability, size and temperature constraints. A tantalum or

aluminum electrolytic capacitor is best, since a film or

ceramic capacitor with almost zero ESR can cause

instability. The aluminum electrolytic capacitor is the least

expensive solution, but, if the circuit operates at low

temperatures (−25°C to −40°C), both the value and ESR of

the capacitor will vary considerably. The capacitor

manufacturers data sheet usually provides this information.

The value for the output capacitor COUT shown in Figure 8

should work for most applications, however it is not

necessarily the optimized solution.

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