CS8183

http://onsemi.com

6

NC

NC

GND

GND

NC

NC

NC

NC

GND

GND

NC

NC

ENABLE1

ENABLE2

C2

20

µF

400 mA

B+

C1

2.0

µF

Figure 13. 400 mA Loading

400 mA Output Capability

Normally regulator outputs cannot be combined to

increase capability. This can cause damage to an IC because

of mismatches in the output drivers. The tight tolerances in

tracking of the CS8183 allow their outputs to be combined

for increased performance. Figure 13 shows the circuit

connections needed to perform this function.

APPLICATION NOTES

Switched Application

The CS8183 has been designed for use in systems where

continuously

on.

Typically,

the

current

into

the

Reference Figure 14.

GND

GND

Adj

GND

GND

ENABLE

5.0 V

C1

1.0

µF

Ignition

Switch

< 1.0

µA

Figure 14.

C2

10

µF

External Capacitors

Output capacitors for the CS8183 are required for

stability. Without them, the regulator outputs will oscillate.

Actual size and type may vary depending upon the

application load and temperature range. Capacitor effective

series resistance (ESR) is also a factor in the IC stability.

Worst−case is determined at the minimum ambient

temperature and maximum load expected.

The output capacitors can be increased in size to any

desired value above the minimum. One possible purpose of

this would be to maintain the output voltage during brief

conditions of negative input transients that might be

characteristic of a particular system.

The capacitors must also be rated at all ambient

temperatures expected in the system. To maintain regulator

stability down to −40

°C, a capacitor rated at that temperature

must be used.

More information on capacitor selection for SMART

REGULATOR

®s is available in the SMART REGULATOR

application note, “Compensation for Linear Regulators.”

Calculating Power Dissipation in a Dual Output Linear

Regulator

The maximum power dissipation for a dual output

regulator (Figure 15) is:

PD(max)

+ {VIN(max) * VOUT1(min)} IOUT1(max)

) {VIN(max) * VOUT2(min)}IOUT2(max2)

(1)

) VIN(max)IQ

where: