MIC2954-07YM TR Micrel Inc, MIC2954-07YM TR Datasheet - Page 11

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MIC2954-07YM TR

Manufacturer Part Number
MIC2954-07YM TR
Description
Improved LP2954 Low Drop-out Regulator ( )
Manufacturer
Micrel Inc
Datasheet

Specifications of MIC2954-07YM TR

Regulator Topology
Positive Fixed or Adjustable
Voltage - Output
5V, 1.24 ~ 29 V
Voltage - Input
2 ~ 30 V
Voltage - Dropout (typical)
0.375V @ 250mA
Number Of Regulators
1
Current - Output
250mA
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
MIC2954-07YMTR
MIC2954-07YMTR
* See Application Information
or about 0.01µF. When doing this, the output capacitor
must be increased to 3.3µF to maintain stability. These
changes reduce the output noise from 430µV to
100µV
bypass capacitor added, noise no longer scales with
output voltage so that improvements are more dramatic
at higher output voltages.
Automotive Applications
The MIC2954 is ideally suited for automotive applica-
tions for a variety of reasons. It will operate over a wide
range of input voltages with very low dropout voltages
(40mV at light loads), and very low quiescent currents
(75µA typical). These features are necessary for use in
battery powered systems, such as automobiles. It is a
“bulletproof” device with the ability to survive both
reverse battery (negative transients up to 20V below
ground), and load dump (positive transients up to 60V)
conditions. A wide operating temperature range with low
temperature coefficients is yet another reason to use
these versatile regulators in automotive designs.
Micrel, Inc.
September 2007
rms
for a100kHz bandwidth at 5V output. With the
Figure 1. /Error Output Timing
11
Thermal Calculations
Layout Considerations
The MIC2954-07BM/-08BM (8-pin surface-mount pack-
age) has the following thermal characteristics when
mounted on a single layer copper-clad printed circuit
board.
Multilayer boards having a ground plane, wide traces
near the pads, and large supply bus lines provide better
thermal conductivity.
Our calculations will use the “worst case” value of
160°C/W, which assumes no ground plane, minimum
trace widths, and a FR4 material board.
Pad Layout (minimum recommended geometry)
Nominal Power Dissipation and Die Temperature
The MIC2954-07BM/-08BM at a 55°C ambient temp-
erature will operate reliably at up to 440mW power
dissipation when mounted in the “worst case” manner
described above. This power level is equivalent to a die
temperature of 125°C, the recommended maximum
temperature for nonmilitary grade silicon integrated
circuits.
PC Board Dielectric Material
FR4
Ceramic
M9999-090607
θ
160°C/W
120°C/W
JA
MIC2954

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