MIC39500/39501
Micrel
MIC39500/39501
5A Low-Voltage Low-Dropout Regulator
Advance Information
General Description
The MIC39500 and MIC39501 is a 5A low-dropout linear
voltage regulator that provides a low-voltage, high-current
output with a minimum of external components. Utilizing
Micrel鈥檚 proprietary Super
尾eta
PNP鈩?pass element, the
MIC39500 offers extremely low dropout (typically 400mV at
5A) and low ground current (typically 70mA at 5A).
The MIC39500 is ideal for PC Add-In cards that need to
convert from standard 5V or 3.3V, down to new, lower core
voltages. A guaranteed maximum dropout voltage of 500mV
over all operating conditions allows the MIC39500 to provide
2.5V from a supply as low as 3V. The MIC39500 also has fast
transient response, for heavy switching applications. The
device requires only 47碌F of output capacitance to maintain
stability and achieve fast transient response
The MIC39500 is fully protected with overcurrent limiting,
thermal shutdown, reversed-battery and reversed-lead in-
sertion protection. The MIC39501 offers a TTL-logic-compat-
ible enable pin and an error flag that indicates undervoltage
and overcurrent conditions. The MIC39500 comes in the TO-
220 and TO-263 packages and is an ideal upgrade to older,
NPN-based linear voltage regulators.
Features
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5A minimum guaranteed output current
500mV maximum dropout voltage over temperature
1% initial accuracy
Low ground current
Current limiting and thermal shutdown
Reversed-battery and reversed-lead insertion protection
Fast transient response
TO-263 and TO-220 packages
TTL/CMOS compatible enable pin (MIC39501 only)
Error flag output (MIC39501 only)
Applications
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鈥?/div>
LDO linear regulator for PC add-in cards
PowerPC鈩?power supplies
High-efficiency linear power supplies
SMPS post regulator
Multimedia and PC processor supplies
Low-voltage microcontrollers
StrongARM鈩?processor supply
For applications requiring input voltage
greater than 16V, see the
MIC29500/1/2/3 family.
Ordering Information
Part Number
MIC39500-2.5BT
MIC39500-2.5BU
MIC39501-2.5BT
MIC39501-2.5BU
Voltage
2.5V
2.5V
2.5V
2.5V
Junction Temp. Range
鈥?0掳C to +125掳C
鈥?0掳C to +125掳C
鈥?0掳C to +125掳C
鈥?0掳C to +125掳C
Package
3-lead TO-220
3-lead TO-263
5-lead TO-220
5-lead TO-263
Typical Application
MIC39500-2.5
V
IN
3.3V
1.0碌F
IN
OUT
GND
47碌F
V
OUT
2.5V
Enable
Shutdown
100K鈩?/div>
MIC39501-2.5
EN
IN
FLG
OUT
GND
47碌F
ERROR
FLAG OUTPUT
V
IN
3.3V
1.0碌F
V
OUT
2.5V
MIC39500
StrongARM is a trademark of Advanced RISC Machines, Ltd.
MIC39501
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
June 1999
1
MIC39500/39501
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