Micrel, Inc.
MIC2800
Typical Characteristics (DC/DC LowQ Mode)
60
50
40
30
20
I
OUT
= 50mA
10 V
OUT
= 1.8V
C
OUT
= 2.2µF
/LowQ = GND
0
0.01 0.1
1
10
100 1,000
FREQUENCY (kHz)
3.6V
Power Supply Rejection Ratio
(Input Voltage)
4.2V
80
70
60
50
40
30
Power Supply Rejection Ratio
(Output Current)
0µA
100
80
LDO Current Limit
vs. Supply Voltage
100µA
50mA
60
40
20
0
2.7
C
OUT
= 2.2µF
/LowQ = GND
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
20 V
IN
= 3.6V
V
OUT
= 1.8V
10 C
OUT
= 2.2µF
/LowQ = GND
0
0.01 0.1
1
10
100 1,000
FREQUENCY (kHz)
1.90
1.89
LDO Output Voltage
vs. Output Current
10
DC/DC LowQ Mode
Output Noise Spectral Density
1
1.88
1.87
1.86
1.85
1.84
V
IN
= 3.6V
V
OUT
= 1.87V
C
OUT
= 2.2µF
/LowQ = GND
10 20 30 40 50 60 70 80 90
OUTPUT CURRENT (mA)
0.1
0.01 V
IN
= 4.2V
V
OUT
= 1.87V
C
OUT
= 2.2µF
/LowQ = GND
0.001
0.01 0.1
1
10 100 1,000 10,000
FREQUENCY (kHz)
September 2007
9
M9999-090507-C
MICREL [ MICREL SEMICONDUCTOR ]
