MIC39300_09 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – 3A, Low-Voltage Low-Dropout Regulator

MIC39300/39301/39302
3A, Low-Voltage Low-Dropout Regulator
General Description
Features
The MIC39300, MIC39301 and MIC39302 are 3.0A low-
dropout linear voltage regulators that provide a low
voltage, high-current output with a minimum of external
components. Utilizing Micrel’s proprietary Super βeta
PNP^® pass element, the MIC39300/1/2 offers extremely
low dropout (typically 385mV at 3.0A) and low ground
current (typically 36mA at 3.0A).
The MIC39300/1/2 is ideal for PC add-in cards that need
to convert from standard 3.3V to 2.5V or 2.5V to 1.8V. A
guaranteed maximum dropout voltage of 500mV over all
operating conditions allows the MIC39300/1/2 to provide
2.5V from a supply as low as 3V, and 1.8V from a supply
as low as 2.5V. The MIC39300/1/2 also has fast transient
response for heavy switching applications. The device
requires only 47µF of output capacitance to maintain
stability and achieve fast transient response.
The MIC39300/1/2 is fully protected with overcurrent
limiting, thermal shutdown, reversed-battery protection,
reversed-leakage protection, and reversed-lead insertion.
The MIC39301 offers a TTL-logic compatible enable pin
and an error flag that indicates under voltage and over
current conditions. Offered in fixed voltages, the
MIC39300/1 comes in the TO-220 and TO-263 (D²Pak)
packages and is an ideal upgrade to older, NPN-based
linear voltage regulators. The MIC39302 adjustable option
allows programming the output voltage anywhere between
1.24V and 15.5V and is offered in a 5-Pin, TO-263 (D²Pak)
package.
• 3.0A minimum guaranteed output current
• 550mV maximum dropout voltage over temperature
• Ideal for 3.0V to 2.5V conversion
• Ideal for 2.5V to 1.8V conversion
• 1% initial accuracy
• Low ground current
• Current limiting and Thermal shutdown
• Reversed-battery protection
• Reversed-leakage protection
• Fast transient response
• TO-263 (D²Pak) and TO-220 packaging
• TTL/CMOS compatible enable pin (MIC39301/2 only)
• Error flag output (MIC39301 only)
• Adjustable output (MIC39302 only)
Applications
• LDO linear regulator for PC add-in cards
• High-efficiency linear power supplies
• SMPS post regulator
• Multimedia and PC processor supplies
• Low-voltage microcontrollers
• StrongARM™ processor supply
_________________________________________________________________________________________________________________________
Typical Application
MIC39300
MIC39301
MIC39302 Adjustable Output Application
(*See Minimum Load Current Section)
Super βeta PNP is a registered trademark of Micrel, Inc.
StrongARM is a trademark of Advanced RISC Machines, Ltd
**See Thermal Load Current Section
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 2009
M9999-102309-A