SA57031-18UK PHILIPS [NXP Semiconductors], SA57031-18UK Datasheet - Page 9

• Manufacturer Part Number: SA57031-18UK
• Description: Micropower 150 mA, low-noise, low dropout linear regulator with on/off
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
APPLICATION INFORMATION
The following points have to be kept in mind for good performance
while using these devices.
Input Capacitor
An input capacitor of 2.2 F is required between the SA57031 input
pin and the circuit ground. This capacitor must be located as close
as possible to the V
pin) and returned to a clean analog ground. Any good quality
ceramic, tantalum, or film capacitor will work.
Output Capacitor
Phase compensation is used for securing stable operation even if
the load current varies. For this reason, an output capacitor with
2003 Jun 23
Micropower 150 mA, low-noise, low dropout linear
regulator with on/off
I
or GND pin (not more than 1 cm away from the
OFF
ON
GND
ON/OFF PIN MUST BE ACTIVELY TERMINATED
Figure 17. Typical application circuit.
A1
A2
R
LOAD
SA57031-XX
A
V
O
B2
B1
9
C
O
impedance. If the impedance of these lines is high, there is a chance
good frequency characteristics is needed. Set it as close to the
circuit as possible and make the wiring as short as possible. The
value of the output capacitance has to be at least 2.2 F and has to
have B-type temperature characteristics.
ON/OFF (Chip Enable) Pin
The ON/OFF pin must be actively terminated, not floating. If the
function is not needed, the pin should be tied to V
enable the device.
Line Impedance of V
The V
to pick up noise or malfunction.
V
C
C
I
2.2 F
O
O
V
= 2.2 mF for V
= 4.7 mF for V
C
I
I
and GND lines should be sufficiently wide to minimize
O
O
= 2.5 to 5.0 V
= 1.8 to 2.5 V
+
–
DC
2.0 V TO 6.0 V
I
and GND
SA57031-XX
I
to permanently
SA00632
Product data