MIC5190BMM Micrel Inc, MIC5190BMM Datasheet - Page 10

• Manufacturer Part Number: MIC5190BMM
• Description: IC CTRLR LDO/FILTER HS 10MSOP
• Manufacturer: Micrel Inc
• Type: Positive Adjustabler

Specifications of MIC5190BMM

• Number Of Outputs: 1
• Voltage - Output: Adjustable
• Current - Supply: 15mA
• Voltage - Input: 0.9 ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MIC5190
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
voltage) will be less than the fully enhanced V
recommended the V
V
of the MIC5190 output driver.
For our example, with a 1.5V output voltage, our MOSFET is
fully enhanced at 4.5V
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.
December 2005
GS
CSH
V
V
+V
EN
J1
J2
OUT
OUT
and output voltage. This is due to the saturation voltage
IN
V
100k
CC1,2
10
10
10k
11.5k
V
100pF
IN
1 F
25V
2V + V
560pF
CC
8.06k
330 F
GS
6
2
4
5
3
1
GS
16V
VIN
EN/UVLO
CSH
VOUT
FB
COMP
U1 MIC2198-BML
voltage has 2V over the minimum
, and so our V
+ V
10 F
GND
OUT
9
VSW
HSD
VDD
BST
LSD
10 F
12
11
10
8
7
10 F
0.1 F
2.2 F
CC
10V
D1
SD103BWS
IRF7821
IRF7821
voltage should be
GS
(gate-source
Figure 9. Post Regulator
CDEP134-1R8MC-H
GS
D2
1N5819HW
, it is
1.8 H
L1
10
CSH
Deviations on the input voltage will be reduced by the
MIC5190’s 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.
Tantalum
10k
330 F
V
OUT
V
OUT
OUT
VIN
ISENSE
GND
MIC5190
COMP
VCC1
VCC2
FB
10 F
12.4k
10
10nF
22 F
10 F
M9999-120105
100
100
1V
OUT
@10A
Micrel
1 F