MIC39500 MICREL [Micrel Semiconductor], MIC39500 Datasheet

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MIC39500

Manufacturer Part Number
MIC39500
Description
5A Low-Voltage Low-Dropout Regulator Advance Information
Manufacturer
MICREL [Micrel Semiconductor]
Datasheet

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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’s proprietary Super eta PNP™ 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 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.
For applications requiring input voltage
greater than 16V, see the
MIC29500/1/2/3 family.
Typical Application
StrongARM is a trademark of Advanced RISC Machines, Ltd.
June 1999
MIC39500/39501
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
3.3V
V
IN
1.0µF
MIC39500-2.5
IN
MIC39500
GND
OUT
47µF
V
2.5V
OUT
Ordering Information
Part Number
MIC39500-2.5BT
MIC39500-2.5BU
MIC39501-2.5BT
MIC39501-2.5BU
1
Features
• 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
• LDO linear regulator for PC add-in cards
• PowerPC™ power supplies
• High-efficiency linear power supplies
• SMPS post regulator
• Multimedia and PC processor supplies
• Low-voltage microcontrollers
• StrongARM™ processor supply
5A Low-Voltage Low-Dropout Regulator
Voltage
Shutdown
3.3V
2.5V
2.5V
2.5V
2.5V
V
Enable
IN
1.0µF
MIC39500/39501
Advance Information
Junction Temp. Range
–40 C to +125 C
–40 C to +125 C
–40 C to +125 C
–40 C to +125 C
MIC39501-2.5
EN
IN
MIC39501
GND
100K
OUT
FLG
47µF
ERROR
FLAG OUTPUT
MIC39500/39501
3-lead TO-220
3-lead TO-263
5-lead TO-220
5-lead TO-263
V
2.5V
Package
OUT
Micrel

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MIC39500 Summary of contents

Page 1

... 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 output capacitance to maintain ...

Page 2

... Unregulated Input: +16V maximum supply. GND Ground: Ground pin and OUT Regulator Output FLG Error Flag (Ouput): Open collector output. Active low indicates an output fault condition OUT 2 GND 1 IN MIC39500-x.xBU TO-263 (U) 5 FLG 4 OUT 3 GND MIC39501-x.xBU TO-263-5 (U) are internally connected. ...

Page 3

... IN –2 V 16V 0. 0.2 OUT 20 125 320 400 10mA 2.1 OUT 7.5 260 2 0.01 125 is +125 C and J(max) J(min 1V. IN OUT MIC39500/39501 Micrel Max Units 0 100 ppm/ C 250 mV mV 500 V(rms) 0 ...

Page 4

... MIC39500/39501 Functional Diagram IN FLAG* EN* MIC39500/39501 1.180V 1.240V Ref. Thermal Shut- down * MIC39501 only 4 Micrel OUT O.V. I LIMIT 18V GND June 1999 ...

Page 5

... A Transient Response The MIC39500/1 has excellent transient response to varia- tions in input voltage and load current. The device has been designed to respond quickly to load current variations and input voltage variations. Large output capacitors are not required to obtain this performance. A standard 47 F output capacitor, preferably tantalum, is all that is required ...

Page 6

... A typical NPN regulator does not have the headroom to do this conversion. Minimum Load Current The MIC39500/1 regulator is specified between finite loads. If the output current is too small, leakage currents dominate and the output voltage rises. A 10mA minimum load current is necessary for proper regulation. ...

Page 7

... TO-220 (T) 0.150 D 0.005 (3.81 D 0.13) 0.400 0.015 (10.16 0.38) 0.241 0.017 (6.12 0.43) 0.578 0.018 (14.68 0.46) 7 Typ. 0.550 0.010 (13.97 0.25) 0.032 0.005 0.018 0.008 (0.81 0.13) (0.46 0.20) Dimensions: TO-220-5 (T) 7 0.050 0.005 (1.27 0.13 0.100 0.020 (2.54 0.51) DIMENSIONS: INCH (MM) 0.177 0.008 (4.50 0.20) 0.050 0.005 (1.27 0.13) SEATING PLANE 0.103 0.013 (2.62 0.33) inch (mm) MIC39500/39501 Micrel ...

Page 8

... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. MIC39500/39501 0.405 0.005 ...

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