SS8014G SSC [Silicon Standard Corp.], SS8014G Datasheet - Page 3

• Manufacturer Part Number: SS8014G
• Description: 150mA Low-Noise LDO Regulator
• Manufacturer: SSC [Silicon Standard Corp.]

1/12/2005 Rev.2.11
PIN DESCRIPTION
APPLICATIONS INFORMATION
The block diagram of the SS8014 is shown in Figure 1.
It consists of an error amplifier,1.25V bandgap reference,
PMOS output transistor, shutdown logic, over-current
protection circuit, and over-temperature protection cir-
cuit.
The SS8014 can be adjusted to a specific output voltage
by using two external resistors (Figure 2). The resis-
tors set the output voltage based on the following
equation:
V
OUT
PIN
1
2
3
4
5
=1.250V X
NAME
SHDN
SHDN
SHDN
GND
OUT
ADJ
IN
GND
GND
IN
IN
R2
R1
Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1µF to GND
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maxi-
mize thermal dissipation.
Active-Low Shutdown Input. A logic low reduces the supply current to less than 1 A. Connect to IN for
normal operation.
Adjust (Input): Adjustable regulator feedback input. It can connect to an external resistor divider for adjust-
able output voltage. A ceramic capacitor of at least 470pF must be connected from ADJ pin to GND
to reduce output noise.
Regulator Output. Fixed or adjustable from +2.5V to +5.5V. Sources up to 150mA. Bypass with a
capacitor of 1µF, < 0.2
SHUTDOWN
SHUTDOWN
+ 1
LOGIC
LOGIC
OVER CURRENT
OVER CURRENT
OVER TEMP. &
OVER TEMP. &
PROTECTION
PROTECTION
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typical ESR to GND.
Figure 1. Functional Diagram
1.25V
1.25V
ref
ref
FUNCTION
Note that the bandgap voltage is relative to the output,
as seen in the block diagram. Because traditional
regulators normally have the reference voltage relative
to ground, they have a different V
values are not critical because ADJ (adjust) has a high
input impedance, but for best results use resistors of
470k
vides greatly improved noise performance.
+
+
ERROR
ERROR
AMP.
AMP.
or less. A capacitor from ADJ to ground pro-
OUT
equation. Resistor
OUT
OUT
ADJ
ADJ
SS8014G
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