4

Rev. 9/22/03

SP6213 Micropower, SC-70, 100mA CMOS LDO Regulator

© Copyright 2003 Sipex Corporation

General Overview

Enable/Shutdown Operation

The SP6213 is turned off by pulling the EN pin low

and turned on by pulling it high. If this enable/

shutdown feature is not required, EN should be

times.

Input Capacitor

A small capacitor of about 1

µF is required from

Any good quality ceramic or tantalum capacitor

may be used at the input.

Output Capacitor

GND to prevent oscillation. The minimum size of

the output capacitor is a 0.47

µF ceramic. The

given datasheet values relate to an IC with a

ceramic output capacitor of 1

µF. Larger values

make the IC more stable which means an improve-

ment of the regulator’s transient response. For a

lower output current, the output capacitance can be

chosen smaller in order to have the same output

stability.

No Load Stability

The SP6213 will remain stable and in regulation

with no external load (other than the internal

voltage driver) unlike many other voltage regula-

tors. This is especially important in CMOS RAM

keep-alive applications.

Thermal Considerations

The SP6213 is designed to provide 100 mA of

continuous current in a very tiny package. Maxi-

mum power dissipation can be calculated based on

the output current and the voltage drop across the

part. To determine the maximum power dissipa-

tion of the package, use the junction-to-ambient

thermal resistance of the device and the following

basic equation:

die and is 125

is the junction-to-ambient thermal resistance for

the regulator and is layout dependent.The actual

power dissipation of the regulator circuit can be

determined using one simple equation:

operating conditions that are critical to the applica-

tion will give the maximum operating conditions

for the regulator circuit. For example, if we are

operating the SP6213 at 3.0V output at room

temperature, with a minimum footprint layout, we

can determine the maximum input voltage for a set

output current.

To prevent the device from entering thermal shut-

down, maximum power dissipation can not be

exceeded. Using the output voltage of 3.0V and an

output current of 100 mA, the maximum input

voltage can be determined. Ground pin current can

be taken from the electrical spec’s- table (0.135

mA at 100 mA). The maximum input voltage is

determined as follows:

After calculations, we find that the maximum

input voltage of a 3.0V application at 100mA of

output current in an SC-70-5 package is 6.02V.

PIN NUMBER

PIN NAME

DESCRIPTION (FUNCTION)

3

GND

Ground Connection

4V

OUT

Regulator Output

5V

IN

Supply Input

1ENEnable / Shutdown (Logic high=enable; logic low = shutdown)

2NCNo Connection

PIN DESCRIPTION

THEORY OF OPERATION