MIC2215-PMMYML TR Micrel Inc, MIC2215-PMMYML TR Datasheet - Page 10

• Manufacturer Part Number: MIC2215-PMMYML TR
• Description: IC REG LDO TRPL HI PSRR 16-MLF
• Manufacturer: Micrel Inc

Specifications of MIC2215-PMMYML TR

• Regulator Topology: Positive Fixed
• Voltage - Output: 3V, 2.8V, 2.8V
• Voltage - Input: 2.25 ~ 5.5 V
• Voltage - Dropout (typical): 0.17V @ 250mA
• Number Of Regulators: 3
• Current - Output: 250mA
• Current - Limit (min): 350mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-MLF®, QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MIC2215-PMMYMLTR; MIC2215-PMMYMLTR

The junction-to-ambient thermal resistance for the
minimum footprint is 43°C/W, from Table 2. The
maximum power dissipation must not be exceeded for
proper operation. Using a lithium-ion battery as the
supply voltage, 2.8V/250mA for channel 1, 3V/100mA for
channel 2 and 2.8V/50mA for channel 3, maximum
power can be calculated as follows:
The calculation shows that we are well below the
maximum allowable power dissipation of 1.511W for a
60°C ambient temperature. After the maximum power
dissipation has been calculated, it is always a good idea
to calculate the maximum ambient temperature for a
125°C junction temperature. Calculating maximum
ambient temperature as follows:
For more information, please refer to the Designing with
Low-Dropout Voltage Regulators Handbook.
Micrel, Inc.
January 2007
P
P
P
P
P
P
P
P
P
P
P
P
T
T
T
A(max)
A(max)
A(max)
DLDO1
DLDO1
DLDO1
DLDO2
DLDO2
DLDO2
DLDO3
DLDO3
DLDO3
DTOTAL
DTOTAL
DTOTAL
= T
=125°C – (540mW x 43°C/W)
= 101°C
= (V
= (4.2V – 2.8V) × 250mA
= 350mW
= (V
= (4.2V – 3.0V) × 100mA
= 120mW
= (V
= (4.2V – 2.8V) × 50mA
= 70mW
= P
= 350mW + 120mW + 70mW
= 540mW
J(max)
IN1
IN2
IN3
DLDO1
– V
– V
– V
– (P
+ P
OUT1
OUT2
OUT3
D
DLDO2
) × I
) × I
) × I
x θ
JA
OUT1
OUT2
OUT3
+ P
)
DLDO3
10
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to
multiply the reference voltage to produce the desired
output voltage. The MIC2215 can be adjusted from
1.25V to (5.5V–max V
resistors (Figure 1). The resistors set the output voltage
based on the following equation:
V
V
REF
OUT
MIC2215-AAA_ML
= 1.25V
=
Figure 1. Adjustable Output
V
REF
⎛
⎜
⎝
1
OUT1
ADJ1
+
DROPOUT
R2
R1
⎞
⎟
⎠
) by using two external
R1
R2
M9999-011207
MIC2215