MIC2811_08 Datasheet, PDF (6/17 Pages) Micrel Semiconductor – Digital Power Management IC 2MHz, 600mA DC/DC with Triple 300mA LDOs

Micrel, Inc.
Typical Characteristics (DC/DC Converter)
SW Frequency
vs. Temperature
2.6
2.5
V
IN
=
4V
2.4
V
OUT
=
1.2V
2.3
I
OUT
=
300mA
2.2
2.1
2
1.9
1.8
1.7
1.6
TEMPERATURE (°C)
DC/DC Enable Threshold
vs. Supply Voltage
880
I = 100mA
860
LOAD
L = 2.2µH
Enable
840 C = 2.2µF
OUT
820
800
Disable
780
760
740
720
7020.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
Output Voltage
vs. Temperature
1.23
V = 4V
IN
1.22 C = 4.7µF
OUT
I = 300mA
1.21 ^OUT
1.2
1.19
1.18
1.17
TEMPERATURE (°C)
Line Regulation
1.2039
I = 300mA
1.2036 ^OUT
L = 2.2µH
1.2033 _{C = 2.2µF}
OUT
1.203
1.2027
1.2024
1.2021
1.2018
1.20125.7
3.4
4.1
4.8
5.5
INPUT VOLTAGE (V)
Switching Frequency
vs. Input Voltage
2.8
I = 300mA
OUT
2.6 L = 2.2µH
C = 2.2µF
2.4
2.2
2
1.8
1.6
1.24.7
3.4
4.1
4.8
5.5
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
1.5 _{L = 2.2µH}
1.45 C = 2.2µF
1.4
1.35
1.3
1.25
1.2
1.15
1.1
1.05
21.7
3.4
4.1
4.8
5.5
INPUT VOLTAGE (V)
MIC2811/2821
1.2VOUT Efficiency
100
90
80
70
60
50
40
30
20
10
00
3V
3.6V
4.2V
L = 2.2µH
C = 2.2µF
100 200 300 400 500 600
OUTPUT CURRENT (mA)
Load Regulation
1.205
V = 3.6V
1.2045 ^IN
L = 2.2µH
1.204 C = 2.2µF
1.2035
1.203
1.2025
1.202
1.2015
1.201
1.2005
1.20 _{100 200 300 400 500 600}
OUTPUT CURRENT (mA)
April 2008
6
M9999-042208-A