MIC49500WU Micrel Inc, MIC49500WU Datasheet - Page 9

• Manufacturer Part Number: MIC49500WU
• Description: 5A LDO, Low Vin, Low Vout, Fast Transient Response, Cap Stable ( )
• Manufacturer: Micrel Inc

Specifications of MIC49500WU

• Regulator Topology: Positive Adjustable
• Voltage - Output: 0.7 ~ 6 V
• Voltage - Input: 1.4 ~ 6 V
• Voltage - Dropout (typical): 0.29V @ 5A
• Number Of Regulators: 1
• Current - Output: 5A
• Current - Limit (min): 5.5A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-7, D²Pak (7 leads + Tab), TO-263CA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-2350; MIC49500WU

July 2007
regulator. The low dropout properties of the MIC49500
allow
dissipation and the associated heat sink without
compromising performance. When this technique is
employed, a capacitor of at least 1µF is needed
directly between the input and regulator ground. Refer
to Application Note 9 for further details and examples
on thermal design and heat sink specification.
Minimum Load Current
The MIC49500, unlike most other high current
regulators, does not require a minimum load to
maintain output voltage regulation.
Power Sequencing
There is no power sequencing requirement for V
V
BIAS
, giving more flexibility to the user.
significant
reductions
in
regulator
power
IN
and
9
Adjustable Regulator Design
The
programming the output voltage anywhere between
0.7Vand 6V. Two resistors are used. The resistor
value between V
exceed 10kΩ. Larger values can cause instability. The
resistor values are calculated by:
Where V
Enable
The fixed output voltage versions of the MIC49500
feature an active high enable input (EN) that allows
on-off control of the regulator. Current drain reduces
to “zero” when the device is shutdown, 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.
MIC49500
R1 = R2 ×
OUT
is the desired output voltage.
OUT
V
0.7
OUT
adjustable
and the adjust pin should not
– 1
version
M9999-071307
IN
and pulled
allows