MIC2800_07 Datasheet, PDF (10/20 Pages) Micrel Semiconductor – Digital Power Management IC 2MHz, 600mA DC/DC w/Dual 300mA/300mA Low VIN LDOs

Micrel, Inc.
Typical Characteristics (LDO1, LDO2)
Power Supply Rejection Ratio
(LDO1 LowQ Mode)
100
90
80
50mA
70
100µA
60
50
40
30
V_IN =
V_OUT
4.2V
= 1.2V
20 C_OUT = 2.2µF
10 ^{/LowQ = GND}
00.01C^BYP0.=1
0.1µF
1
10 100
FREQUENCY (kHz)
1,000
Power Supply Rejection Ratio
(LDO2 Normal Mode)
100
100µA
90
300mA
80
70
60
50
150mA
40 ^50mA
30
V_IN = 4.2V
V_OUT = 1.2V
20 C_OUT = 2.2µF
10 ^{/LowQ = VIN}
00.01C^BYP0.=1
0.01µF
1
10
100
FREQUENCY (kHz)
1,000
Ground Current
vs. Output Current
70
60
50
40
V_IN = 2.8V
V_OUT = 2.8V
C_OUT = 2.2µF
C_BYP = 0.1µF
300 _{50 100 150 200 250 300}
OUTPUT CURRENT (mA)
Dropout Chararcteristics
3.0
C_OUT = 2.2µF
C_BYP = 0.1µF
/LowQ = V_IN
100mA
2.5
150mA
300mA
2.01.5
2.0 2.5 3.0 3.5
SUPPLY VOLTAGE (V)
Power Supply Rejection Ratio
(LDO1 Normal Mode)
80
70
60
50mA
50 150mA
100µA
40
30 _{VIN = 4.2V}
20 ^VOUT ^{= 1.2V}
C_OUT = 2.2µF
10 /LowQ = V_IN
00.01C^BYP0.=1
0.1µF
1
10 100
FREQUENCY (kHz)
1,000
(LDO2) Output Voltage
vs. Temperature
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.50
V_IN = V_OUT + 1V
V_OUT = 2.8V
C_OUT = 2.2µF
C_BYP = 0.1µF
EN1 = GND
EN2 = V_IN
20 40 60 80
TEMPERATURE (°C)
(LDO2) Dropout Voltage
vs. Output Current
140
120
100
80
60
40
V_OUT = 2.8V
20
C_OUT = 2.2µF
C_BYP = 0.1µF
00
/LowQ = V_IN
50 100 150 200 250 300
OUTPUT CURRENT (mA)
LDO1 Output Noise
Spectral Density
10
1
0.1
V_IN = 4.2V
0.01 ^VOUT ^{= 1.2V}
C_OUT = 2.2µF
C_BYP = 0.1µF
/LowQ = V_IN
0.000.101 _{0.1 1 10}
100 1,000 10,000
FREQUENCY (kHz)
MIC2800
Power Supply Rejection Ratio
(LDO2 LowQ Mode)
-90
50mA
-80
10mA
-70
-60
100µA
-50
-40
-30 V_IN = 4.2V
-20
V_OUT = 2.8V
C_OUT = 2.2µF
-10 ^{/LowQ = V}IN
00.0C1 ^BYP0.=1
0.01µF
1
10
100
FREQUENCY (kHz)
1,000
Ground Current
vs. Temperature
70
65
100µA
60
55
300mA
50
45
100mA
V_IN = V_OUT + 1V
V_OUT = 2.8V
C_OUT = 2.2µF
40
C_BYP = 0.1µF
/LowQ = V_IN
35
EN1 = GND
EN2 = V_IN
30
20 40 60 80
TEMPERATURE (°C)
(LDO2) Dropout Voltage
vs. Temperature
0.20
0.18
V_OUT
C_OUT
=
=
2.8V
2.2µF
300mA
0.16 ^CBYP ^{= 0.1µF}
0.14 ^{/LowQ = VIN}
0.12
0.10
150mA
0.08
100mA
0.06
0.04
50mA
0.02
20mA
0.00
20 40 60 80
TEMPERATURE (°C)
LDO2 Output Noise
Spectral Density
10
1
0.1
V_IN = 4.2V
0.01 ^VOUT ^{= 2.8V}
C_OUT = 2.2µF
C_BYP = 0.1µF
/LowQ = V_IN
0.0001.01 _{0.1 1 10}
100 1,000 10,000
FREQUENCY (kHz)
September 2007
10
M9999-090507-C