CS8363

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4

PACKAGE PIN DESCRIPTION

PACKAGE PIN #

PIN SYMBOL

FUNCTION

1

Standby output voltage delivering 100 mA.

2

Input voltage.

3

Tracking output voltage controlled by ENABLE delivering 250 mA.

4

GND

Reference ground connection.

5

Adj

6

ENABLE

Provides on/off control of the tracking output, active LOW.

7

RESET

regulation.

CIRCUIT DESCRIPTION

ENABLE Function

The ENABLE function switches the output transistor for

millivolts of hysteresis to prevent spurious output activity

during power−up or power−down.

RESET Function

The RESET is an open collector NPN transistor,

controlled by a low voltage detection circuit sensing the

is as low as 1.0 V to ensure reliable operation of

microprocessor−based systems.

but is rated for 250 mA. The output is configured as a

tracking regulator of the standby output. By using the

standby output as a voltage reference, giving the user an

external programming lead (Adj lead), output voltages from

3.3 V to 20 V are easily realized. The programming is done

with a simple resistor divider, and following the formula:

VTRK + VSTBY

(1

) R1 R2) ) IAdj

R1

If another 3.3 V output is needed, simply connect the Adj

C1*

0.1

mF

GND

CS8363

MCU

B+

Adj

ENABLE

RESET

R3

C2**

10

mF

ESR < 8.0

W

3.3 V, 100 mA

RESET

I/O

R2

R1

C3**

10

mF

ESR < 8.0

W

SW 5.0 V,

250 mA

GND

*C1 is required if regulator is located far from power supply filter.

**C2 and C3 are required for stability.

Figure 2. Test and Application Circuit, 3.3 V, 5.0 V Regulator