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MIC39150 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 1.5A Low-Voltage Low-Dropout Regulator | |||
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MIC39150/39151
Micrel
MIC39150/39151
1.5A Low-Voltage Low-Dropout Regulator
General Description
The MIC39150 and MIC39151 are 1.5A low-dropout linear
voltage regulators that provide a low voltage, high current
output with a minimum of external components. Utilizing
Micrelâs proprietary Super βeta PNP⢠pass element, the
MIC39150/1 offers extremely low dropout (typically 375mV at
1.5A) and low ground current (typically 17mA at 1.5A).
The MIC39150/1 is ideal for PC add-in cards that need to
convert from 3.3V to 2.5V or 2.5V to 1.8V. A guaranteed
maximum dropout voltage of 500mV over all operating con-
ditions allows the MIC39150/1 to provide 2.5V from a supply
as low as 3V or 1.8V from a supply as low as 2.3V. The
MIC39150/1 also has fast transient response for heavy
switching applications. This device requires only 10µF of
output capacitance to maintain stability and achieve fast
transient response
The MIC39150/1 is fully protected with overcurrent limiting,
thermal shutdown, reversed-battery protection, reversed-
lead insertion, and reverse-leakage protection. The MIC39151
offers a TTL-logic compatible enable pin and an error flag that
indicates undervoltage and over current conditions. Offered
in fixed voltages of 2.5V and 1.8V, the MIC39150/1 comes in
the TO-220 and TO-263 packages and is an ideal upgrade to
older, NPN-based linear voltage regulators.
Features
⢠1.5A minimum guaranteed output current
⢠500mV maximum dropout voltage over temperature
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5 to 1.8V conversion
⢠1% initial accuracy
⢠Low ground current
⢠Current limiting and Thermal shutdown
⢠Reversed-battery and reversed lead insertion protection
⢠Reversed-leakage protection
⢠Fast transient response
⢠TO-263 and TO-220 packaging
⢠TTL/CMOS compatible enable pin (MIC39151 only)
⢠Error flag output (MIC39151 only)
Applications
⢠Low-voltage digital ICs
⢠LDO linear regulator for PC add-in cards
⢠High-efficiency linear power supplies
⢠SMPS post regulator
⢠Low-voltage microcontrollers
⢠StrongARM⢠processor supply
For applications requiring input voltage greater than 16V or
automotive load dump protection, see the MIC29150/1/2/3
family.
Typical Application
VIN
3.3V
MIC39150-2.5
IN
OUT
GND
VOUT
2.5V
10µF
tantalum
MIC39150
ENABLE
SHUTDOWN
VIN
3.3V
100kâ¦
MIC39151-2.5
EN FLG
IN
OUT
GND
ERROR FLAG
OUTPUT
VOUT
2.5V
10µF
tantalum
MIC39151
StrongARM is a trademark of Advanced RSIC Machines, Ltd.
Micrel, Inc. ⢠1849 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel + 1 (408) 944-0800 ⢠fax + 1 (408) 944-0970 ⢠http://www.micrel.com
May 2000
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MIC39150/39151
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