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MIC39500_05 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 5A μCap Low-Voltage Low-Dropout Regulator | |||
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MIC39500/39501
5A µCap Low-Voltage Low-Dropout Regulator
General Description
The MIC39500 and MIC39501 are 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
MIC39500/1 offers extremely low dropout (typically 400mV
at 5A) and low ground current (typically 70mA at 5A).
The MIC39500/1 is ideal for PC Add-In cards that need to
convert from standard 2.5V or 3.3V, down to new, lower
core voltages. A guaranteed maximum dropout voltage of
500mV over all operating conditions allows the MIC39500/1
to provide 2.5V from a supply as low as 3V or 1.8V from
2.5V. The MIC39500/1 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 MIC39500/1 is fully protected with overcurrent limiting,
thermal shutdown, reversed-battery protection, reversed-
lead insertion protection, and reversed-leakage protection.
The MIC39501 offers a TTL-logic-compatible enable pin and
an error ï¬ag that indicates undervoltage and overcurrent
conditions. Offered in a ï¬xed voltages, 1.8V and 2.5V, the
MIC39500/1 comes in the TO-220 and TO-263 packages
and an ideal upgrade to older, NPN-based linear voltage
regulators.
Features
⢠5A minimum guaranteed output current
⢠400mV dropout voltage
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 and reversed-lead insertion protection
⢠Reversed-leakage protection
⢠Fast transient response
⢠TO-263 and TO-220 packages
⢠TTL/CMOS compatible enable pin (MIC39501 only)
⢠Error ï¬ag output (MIC39501 only)
⢠Ceramic capacitor stable (See Application Information)
Applications
⢠Low Voltage Digital ICs
⢠LDO linear regulator for PC add-in cards
⢠High-efï¬ciency linear power supplies
⢠SMPS post regulator
⢠Multimedia and PC processor supplies
⢠Low-voltage microcontrollers
⢠StrongARM⢠processor supply
For applications requiring input voltage
greater than 16V, see the
MIC29500/1/2/3 family. For applications
with input voltage 6V or below, see
MIC3750x LDOs.
Typical Application
VIN
3.3V
1.0µF
MIC39500-2.5
IN
OUT
GND
VOUT
2.5V
47µF
MIC39500
Enable
Shutdown
VIN
3.3V
1.0µF
100Kâ¦
MIC39501-2.5
EN FLG
IN OUT
GND
ERROR
FLAG OUTPUT
VOUT
2.5V
47µF
MIC39501
StrongARM is a trademark of Advanced RISC Machines, Ltd.
Micrel, Inc. ⢠2180 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel + 1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
August 2005
1
M9999-082605-B
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