MIC29302WU Micrel Inc, MIC29302WU Datasheet - Page 15

• Manufacturer Part Number: MIC29302WU
• Description: IC REG LDO 3.0A ADJ TO-263-5
• Manufacturer: Micrel Inc

Specifications of MIC29302WU

• Regulator Topology: Positive Adjustable
• Voltage - Output: 1.25 ~ 26 V
• Voltage - Input: Up to 26V
• Voltage - Dropout (typical): 0.37V @ 3A
• Number Of Regulators: 1
• Current - Output: 3A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-5, D²Pak (5 leads + Tab), TO-263BA
• Primary Input Voltage: 26V
• Output Voltage: 12V
• Dropout Voltage Vdo: 370mV
• No. Of Pins: 5
• Output Current: 3A
• Voltage Regulator Case Style: TO-263
• Operating Temperature Range: -40°C To +125°C
• Svhc: No
• Output Voltage Fixed: 12V
• Rohs Compliant: Yes
• Voltage Regulator Type: Linear
• Topology: LDO
• Regulator Output Type: Adjustable
• Polarity Type: Positive
• Number Of Outputs: Single
• Input Voltage (min): 2.5V
• Input Voltage (max): 26V
• Package Type: TO-263
• Load Regulation: 1%
• Line Regulation: 0.5%
• Output Voltage Accuracy: ±1%
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Dropout Voltage@current (max): 0.175@100mA/0.6@3A
• Dropout Voltage@current (typ): 0.08@100mA/0.25@1.5A
• Pin Count: 5 +Tab
• Mounting: Surface Mount
• Quiescent Current (max): 35mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Compliant
• Other names: 576-3369-5; MIC29302WU

Adjustable Regulator Design
The adjustable regulator versions, MIC29xx2 and MIC29xx3,
allow programming the output voltage anywhere between
1.25V and the 26V maximum operating rating of the family.
November 2005
Figure 4.Adjustable Regulator with Resistors
Device
MIC29150................................................5mA
MIC29300................................................7mA
MIC29500..............................................10mA
MIC29750..............................................10mA
V IN
10µF
MIC29152BT
R2
R1
Minimum Load
22µF
V OUT
15
Two resistors are used. Resistors can be quite large, up to
1MΩ, because of the very high input impedance and low
bias current of the sense comparator: The resistor values
are calculated by:
Where V
component definition. Applications with widely varying load
currents may scale the resistors to draw the minimum load
current required for proper operation (see above).
Error Flag
MIC29xx1 and MIC29xx3 versions feature an Error Flag,which
looks at the output voltage and signals an error condition
when this voltage drops 5% below its expected value. The
error flag is an open-collector output that pulls low under fault
conditions. It may sink 10mA. Low output voltage signifies a
number of possible problems, including an overcurrent fault
(the device is in current limit) and low input voltage. The
flag output is inoperative during overtemperature shutdown
conditions.
Enable Input
MIC29xx1 and MIC29xx2 versions feature an enable (EN)
input that allows ON/OFF control of the device. Special design
allows “zero” current drain when the device is disabled—only
microamperes of leakage current flows. The EN input has
TTL/CMOS compatible thresholds for simple interfacing with
logic, or may be directly tied to ≤ 30V. Enabling the regulator
requires approximately 20µA of current.
O
is the desired output voltage. Figure 4 shows
R
1
=
R
2



1.240
V
OUT
−
 1


M9999-110205