GM6155 View Datasheet(PDF) - Gamma Microelectronics Inc.
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GM6155 Datasheet PDF : 9 Pages
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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 VOUT equation.
Resistor values are not critical because ADJ(adjust) has a high input impedance, but for best results use
resistors of 470kW or less for best results. A capacitor from ADJ to ground provides greatly improved noise
performance.
VIN
1
2
5
R1
VOUT
2.2µF
3
4
470pF
R2
Figure 5. Ultra-Low- Noise Adjustable Voltage Application
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
Typical Characteristics
0 VIN = 6V
VOUT = 5V
-20
-40
-60
-80
IOUT =100mA
-100
COUT = 1µF
10 100 1k 10k 100k 1M 10M
FREQUENCY(Hz)
Figure 6. Power Supply Rejection Ratio
320
280
125°C
240
200
25°C
160
-40°C
120
80
40
0
0
40
80
120
160
OUTPUT CURRENT (mA)
Figure 8. Dropout Voltage vs.
Output Current
0 VIN = 6V
VOUT = 5V
-20
-40
-60
-80
IOUT =100mA
COUT = 2.2µF
-100
CBYP = 0.01µF
10 100 1k 10k 100k 1M 10M
FREQUENCY(Hz)
Figure 7. Power Supply Rejection Ratio
10
1
100mA
0.1
10mA
0.01
VOUT=5V
0.001 COUT=10µF
electrolytic
0.0001 CBYP=10nF
10 100 1k
1mA
10k 100k 1M 10M
FREQUENCY(Hz)
Figure 9. Noise Performance
7
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