MIC49300-1.2WR Micrel Inc, MIC49300-1.2WR Datasheet - Page 7

• Manufacturer Part Number: MIC49300-1.2WR
• Description: IC REG LDO 3A 1.2V SPAK-5
• Manufacturer: Micrel Inc

Specifications of MIC49300-1.2WR

• Regulator Topology: Positive Fixed
• Voltage - Output: 1.2V
• Voltage - Input: Up to 6.5V
• Voltage - Dropout (typical): 0.28V @ 3A
• Number Of Regulators: 1
• Current - Output: 3A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SPAK-5
• Voltage Regulator Type: Linear
• Topology: LDO
• Regulator Output Type: Fixed
• Polarity Type: Positive
• Number Of Outputs: Single
• Input Voltage (min): 1.4V
• Input Voltage (max): 6.5V
• Output Voltage: 1.2V
• Package Type: SPAK
• Output Current: 3A
• Load Regulation: 0.2%
• Line Regulation: 0.01%/V
• Output Voltage Accuracy: ±1%
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Dropout Voltage@current (max): 0.2@1500mA/0.4@3A
• Dropout Voltage@current (typ): 0.125@1500mA/0.28@3A
• Pin Count: 5 +Tab
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Compliant
• Other names: 576-1811-5; MIC49300-1.2WR

Adjustable Regulator Design
The MIC49300 adjustable version allows programming the
output voltage anywhere between 0.9Vand 5V. Two resistors
are used. The resistor value between V
should not exceed 1kΩ. Larger values can cause instability.
The resistor values are calculated by:
Where V
Enable
The fi xed output voltage versions of the MIC49300 feature an
active high enable input (EN) that allows on-off control of the
regulator. Current drain reduces to “zero” when the device is
sn}tñ◊wn, with only microamperes of leakage current. The
EN input has TTL/CMOS compatible thresholds for simple
logic interfacing. EN may be directly tied to V
up to the maximum supply voltage
August 2005
MIC49300
R1 R2
=
=
OUT
R2
R2
×
×
is the desired output voltage.









V
V
V
0 9
0 9 .
0 9
OUT
OUT
−1









OUT
and the adjust pin
IN
and pulled
7
M9999-082605-B
Micrel, Inc.