MIC5190
Micrel
The gate-source threshold specified in most MOSFET data
sheets refers to the minimum voltage needed to fully enhance
the MOSFET. Although for the most part, the MOSFET will be
operating in the linear region and the V
GS
(gate-source
voltage) will be less than the fully enhanced V
GS
, it is
recommended the V
CC
voltage has 2V over the minimum
V
GS
and output voltage. This is due to the saturation voltage
of the MIC5190 output driver.
V
CC1,2
e 2V + V
GS
+ V
OUT
For our example, with a 1.5V output voltage, our MOSFET is
fully enhanced at 4.5V
GS
, and so our V
CC
voltage should be
greater or equal to 8V.
Input Capacitor
Good input bypassing is important for improved perfor-
mance. Low ESR and low ESL input capacitors reduce both
the drain of the N-Channel MOSFET, as well as the source
impedance to the MIC5190. When a load transient on the
output occurs, the load step will also appear on the input.
Deviations on the input voltage will be reduced by the
MIC5190s PSRR, but nonetheless appear on the output.
There really is no minimum input capacitance, but it is
recommended that the input capacitance be equal to or
greater than the output capacitance for best performance.
Output Capacitor
The MIC5190 is stable with any type or value of output
capacitor (even without any output capacitor!). This allows
the output capacitor to select which parameters of the regu-
lator are important. In cases where transient response is the
most important, low ESR and low ESL ceramic capacitors are
recommended. Also, the more capacitance on the output, the
better the transient response.
4
5
3
1
2
VIN
EN/UVLO
CSH
VOUT
FB
LSD
560pF
8.06k
BST
COMP
6
HSD
12
VSW
11
GND
D1
SD103BWS
2.2礔
10V
0.1礔
10
8
VDD
7
U1 MIC2198-BML
9
100pF
11.5k
100k
V
OUT
V
OUT
CSH
J2
EN
J1
+V
IN
V
IN
CSH
V
OUT
10k
10k
10&
10&
1礔
25V
330礔
16V
10礔
10礔
10礔
10礔
10礔
22礔
1V
OUT
@10A
D2
1N5819HW
IRF7821
IRF7821
L1
1.8礖
CDEP134-1R8MC-H
12.4k
330礔
Tantalum
OUT
VCC1
VCC2
VIN
FB
ISENSE
COMP
GND
10nF
100&
100&
10&
MIC5190
1礔
V
OUT
Figure 9. Post Regulator
December 2005
10 M9999-120105
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