MIC2800 Datasheet, PDF (9/21 Pages) Micrel Semiconductor – Digital Power Management IC 2MHz, 600mA DC/DC w/Dual 300mA/300mA Low VIN LDOs

Micrel, Inc.
Typical Characteristics (DC/DC LowQ Mode)
Power Supply Rejection Ratio
(Input Voltage)
60
4.2V
50
3.6V
40
30
20
I_OUT = 50mA
10
V_OUT = 1.8V
C_OUT = 2.2µF
/LowQ = GND
00.01 0.1 1 10 100
FREQUENCY (kHz)
1,000
LDO Output Voltage
vs. Output Current
1.90
1.89
1.88
1.87
1.86
V_IN = 3.6V
1.85
V_OUT = 1.87V
C_OUT = 2.2µF
/LowQ = GND
1.84
10 20 30 40 50 60 70 80 90
OUTPUT CURRENT (mA)
Power Supply Rejection Ratio
(Output Current)
80
0µA
70
60
50
40 ^50mA
100µA
30
20 ^VIN ^{= 3.6V}
V_OUT = 1.8V
10 C_OUT = 2.2µF
/LowQ = GND
00.01 0.1 1 10 100
FREQUENCY (kHz)
1,000
DC/DC LowQ Mode
Output Noise Spectral Density
10
1
0.1
0.01 ^{VIN = 4.2V}
V_OUT = 1.87V
C_OUT = 2.2µF
/LowQ = GND
0.000.101 _{0.1 1 10}
100 1,000 10,000
FREQUENCY (kHz)
MIC2800
LDO Current Limit
vs. Supply Voltage
100
80
60
40
20
C_OUT = 2.2µF
/LowQ = GND
0
2.7 3.4 4.1 4.8 5.5
SUPPLY VOLTAGE (V)
June 2006
9
M9999-061406
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