CS8363YDPSR7 datasheet(4/8 Pages) ONSEMI

Part #	CS8363YDPSR7

Description	3.3 V Dual Micropower Regulator with ENABLE and RESET

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CS8363

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PACKAGE PIN DESCRIPTION

PACKAGE PIN #

PIN SYMBOL

FUNCTION

D2PAK−7

1

VSTBY

Standby output voltage delivering 100 mA.

2

VIN

Input voltage.

3

VTRK

Tracking output voltage controlled by ENABLE delivering 250 mA.

4

GND

Reference ground connection.

5

Adj

Resistor divider from VTRK to Adj. Sets the output voltage on VTRK. If tied to

VTRK, VTRK will track VSTBY.

6

ENABLE

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

7

RESET

CMOS compatible output lead that goes low whenever VSTBY falls out of

regulation.

CIRCUIT DESCRIPTION

ENABLE Function

The ENABLE function switches the output transistor for

VTRK on and off. When the ENABLE lead voltage exceeds

1.4 V (Typ), VTRK turns off. This input has several hundred

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

VSTBY (3.3 V) output voltage. This circuit guarantees the

RESET output stays below 1.0 V (0.1 V Typ) when VSTBY

is as low as 1.0 V to ensure reliable operation of

microprocessor−based systems.

VTRK Output Voltage

This output uses the same type of output device as VSTBY,

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

lead to the VTRK output lead.

C1*

0.1 mF

GND

CS8363

MCU

B+

VIN

VTRK

Adj

ENABLE

RESET

VSTBY

R3

VDD

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

VTRK ∼ VSTBY(1 + R1/R2)

For VTRK ∼ 5.0 V, R1/R2 ∼ 0.5

*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

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