MIC5202-3.0YM TR Micrel Inc, MIC5202-3.0YM TR Datasheet - Page 6

• Manufacturer Part Number: MIC5202-3.0YM TR
• Description: Dual 100mA, 1% LDO Regulator ( )
• Manufacturer: Micrel Inc

Specifications of MIC5202-3.0YM TR

• Regulator Topology: Positive Fixed
• Voltage - Output: 3V
• Voltage - Input: Up to 26V
• Voltage - Dropout (typical): 0.225V @ 100mA
• Number Of Regulators: 1
• Current - Output: 100mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MIC5202-3.0YMTR; MIC5202-3.0YMTR

MIC5202
Applications Information
External Capacitors
A 1µF capacitor is recommended between the MIC5202 output
and ground to prevent oscillations due to instability. Larger val-
ues serve to improve the regulator’s transient response. Most
types of tantalum or aluminum electrolytics will be adequate;
fi lm types will work, but are costly and therefore not recom-
mended. Many aluminum electrolytics have electrolytes that
freeze at about –30°C, so solid tantalums are recommended
for operation below –25°C. The important parameters of the
capacitor are an effective series resistance of about 5Ω or
less and a resonant frequency above 500kHz. The value of
this capacitor may be increased without limit.
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.47µF for current below 10mA or 0.33µF for currents below
1 mA. A 1µF capacitor should be placed from the MIC5202
input to ground if there is more than 10 inches of wire be-
tween the input and the AC fi lter capacitor or if a battery is
used as the supply.
ENABLE Input
The MIC5202 features nearly zero OFF mode current. When
the ENABLE input is held below 0.7V, all internal circuitry is
powered off. Pulling this pin high (over 2.0V) re-enables the
device and allows operation. The ENABLE pin requires a small
amount of current, typically 15µA. While the logic threshold
is TTL/CMOS compatible, ENABLE may be pulled as high
as 30V, independent of the voltage on V
of the MIC5202 may be enabled separately.
General Notes
The MIC5202 will remain stable and in regulation with no
load in addition to the internal voltage divider, unlike many
other voltage regulators. This is especially important in
CMOS RAM keep-alive applications. Thermal shutdown is
independant on both halfs of the dual MIC5202, however an
over-temperature condition on one half might affect the other
because of proximity. When used in dual supply systems
where the regulator load is returned to a negative supply, the
output voltage must be diode clamped to ground.
Both MIC5202 GROUND pins must be tied to the same ground
potential. Isolation between the two halfs allows connecting
the two V
MIC5202
IN
pins to different supplies.
IN
. The two portions
6
Part I. Layout
The MIC5202-xxBM (8-pin surface mount package) has the
following thermal characteristics when mounted on a single
layer copper-clad printed circuit board.
Multi-layer boards having a ground plane, wide traces near
the pads, and large supply bus lines provide better thermal
conductivity.
The “worst case” value of 160°C/W assumes no ground plane,
minimum trace widths, and a FR4 material board.
Part II. Nominal Power Dissipation and Die Tempera-
ture
The MIC5202-xxBM at a 25°C ambient temperature will oper-
ate reliably at up to 625mW power dissipation when mounted
in the “worst case” manner described above. At an ambient
temperature of 55°C, the device may safely dissipate 440mW.
These power levels are equivalent to a die temperature of
125°C, the recommended maximum temperature for non-
military grade silicon integrated circuits.
Thermal Considerations
Minimum recommended board pad size, SO-8.
245 mil
PC Board
Dielectric
Ceramic
30 mil
FR4
50 mil
160°C/W
120°C/W
θ
JA
150 mil
50 mil
March 2006
Micrel