GM6155 ETC2 [List of Unclassifed Manufacturers], GM6155 Datasheet - Page 7

• Manufacturer Part Number: GM6155
• Description: 150mA LOW - NOISE LDO REGULATOR
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

This equation is correct due to the configuration of the bandgap reference. The bandgap voltage is relative to
the output, as seen in the block diagram. Traditional regulators normally have the reference voltage relative to
ground and have a different V
Resistor values ate not critical because ADJ(adjust) has a high input impedance, but for best results use
resistors of 470kW or less. A capacitor from ADJ to ground provides greatly improved noise performance.
Figure 5 includes the optional 470pF noise bypass capacitor from ADJ to GND to reduce output noise.
Dual-Supply Operation
When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage
must be diode clamped to ground.
Typical Characteristics
-100
320
280
240
200
160
120
-20
-40
-60
-80
80
40
0
0
10
0
Figure 6. Power Supply Rejection Ratio
V
V
IN
OUT
= 6V
100
Figure 8. Dropout Voltage vs.
= 5V
40
1k
Output Current
FREQUENCY(Hz)
OUTPUT CURRENT (mA)
Figure 5. Ultra-Low- Noise Adjustable Voltage Application
10k
80
OUT
100k
125°C
equation.
I
C
OUT
V
120
25°C
OUT
IN
-40°C
1M
=100mA
= 1µF
1
2
3
10M
160
470pF
4
5
0.0001
0.001
R1
-100
0.01
-20
-40
-60
-80
0.1
10
0
10
1
10
R2
Figure 7. Power Supply Rejection Ratio
V
V
V
C
electrolytic
C
IN
OUT
OUT
OUT
BYP
= 6V
100
100
=10nF
2.2µF
=5V
=10µF
Figure 9. Noise Performance
= 5V
V
OUT
1k
1k
FREQUENCY(Hz)
FREQUENCY(Hz)
10k
10k
10mA
100k
100k
1mA
100mA
I
C
C
OUT
OUT
BYP
=100mA
1M
= 0.01µF
= 2.2µF
1M
10M
10M
GM6155
7