mic39301 Micrel Semiconductor, mic39301 Datasheet

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mic39301

Manufacturer Part Number
mic39301
Description
Mic39300/mic39301 3a Low-voltage Low-dropout Regulator
Manufacturer
Micrel Semiconductor
Datasheet

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General Description
The MIC39300 and MIC39301 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 eta PNP
MIC39300/1 offers extremely low dropout (typically 400mV
at 3.0A) and low ground current (typically 36mA at 3.0A).
The MIC39300/1 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 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 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 MIC39300/1 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 packages and is an
ideal upgrade to older, NPN-based linear voltage regulators.
For applications with input voltage 6V
or below, see MIC3730x LDOs.
Typical Application
Super eta PNP is a registered trademark of Micrel, Inc.
StrongARM is a trademark of Advanced RISC Machines, Ltd.
August 2005
MIC39300/39301
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
3.3V
V
IN
MIC39300-2.5
IN
MIC39300
GND
OUT
47µF
®
pass element, the
V
2.5V
OUT
1
Features
• 3.0A minimum guaranteed output current
• 500mV maximum dropout voltage over temperature
• 1% initial accuracy
• Low ground current
• Current limiting and Thermal shutdown
• Reversed-battery protection
• Reversed-leakage protection
• Fast transient response
• TO-263 and TO-220 packaging
• TTL/CMOS compatible enable pin (MIC39301 only)
• Error flag output (MIC39301 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
– Ideal for 3.0V to 2.5V conversion
– Ideal for 2.5V to 1.8V conversion
3A Low-Voltage Low-Dropout Regulator
SHUTDOWN
ENABLE
3.3V
V
MIC39300/39301
IN
MIC39301
MIC39301-2.5
EN
IN
100k
GND
FLG
OUT
47µF
M9999-082605-B
ERROR FLAG
OUTPUT
V
2.5V
OUT
Micrel, Inc.

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mic39301 Summary of contents

Page 1

... The MIC39300/1 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 packages and is an ideal upgrade to older, NPN-based linear voltage regulators ...

Page 2

... MIC39300-2.5WT* MIC39300-2.5BU MIC39300-2.5WU* MIC39301-1.8BT MIC39301-1.8WT* MIC39301-1.8BU MIC39301-1.8WU* MIC39301-2.5BT MIC39301-2.5WT* MIC39301-2.5BU MIC39301-2.5WU* *ROHS compliant with high-melting solder exemption. Pin Configuration MIC39300-x.xBT TO-220-3 (T) MIC39301-x.xBT TO-220-5 (T) Pin Description Pin Number Pin Number ...

Page 3

... I Current Limit OUT(lim) Enable Input (MIC39301) V Enable Input Voltage EN I Enable Input Current IN I Shutdown Output Current OUT(shdn) Flag Output (MIC39301) I Output Leakage Current FLG(leak) V Output Low Voltage FLG(do) V Low Threshold FLG High Threshold Hysteresis Notes: 1. Exceeding the absolute maximum ratings may damage the device. ...

Page 4

MIC39300/39301 – V when V decreases to 99% of its nominal output voltage with OUT OUT voltage is the input-to-output voltage differential with the minimum input voltage being 2.5V. Minimum input operating voltage ...

Page 5

MIC39300/39301 Typical Characteristics Power Supply vs. Ripple Rejection 2.5V 20 OUT OUT LOAD 0 FREQUENCY (Hz) Dropout Voltage vs. Temperature 600 500 V ...

Page 6

MIC39300/39301 Enable Current vs. Temperature 2.60 2.58 2.56 2.54 2.52 typical 2.5V device 2.50 2.48 2.46 2. 10mA LOAD 2.42 2.40 -40 - 100 120 TEMPERATURE ( C) Flag-Low Voltage vs. Temperature 250 ...

Page 7

MIC39300/39301 Functional Characteristics Line Transient Response 5V 3.3V TIME (100 s/div.) Load Transient Response 3A TIME (500 s/div.) August 2005 V = 2.5V OUT I = 10mA OUT 2.5V ...

Page 8

... MIC39300/39301 Functional Diagram IN FLAG* EN* M9999-082605-A 1.180V 1.240V Ref. Thermal Shut- down * MIC39301 only 8 Micrel, Inc. OUT O.V. I LIMIT 18V GND August 2005 ...

Page 9

MIC39300/39301 Applications Information The MIC39300 high-performance low-dropout voltage regulator suitable for moderate to high-current voltage regu- lator applications. Its 500mV dropout voltage at full load makes it especially valuable in battery-powered systems and as a high-efficiency noise filter ...

Page 10

... When the error flag is not used best to leave it open. The flag pin can be tied directly to pin 4, the output pin. Enable Input The MIC39301 version features an enable input for on/off control of the device. Its shutdown state draws “zero” current (only microamperes of leakage). The enable input is TTL/ CMOS compatible for simple logic interface, but can be connected 20V ...

Page 11

MIC39300/39301 Package Information 0.108 0.005 (2.74 0.13) 0.818 0.005 (20.78 0.13) 0.050 0.003 (1.27 .08) 0.108 0.005 (2.74 0.13) 0.067 0.005 (1.70 0.127) 0.268 REF (6.81 REF) August 2005 0.151 D 0.005 (3.84 D 0.13) 0.176 0.005 (4.47 0.13) 0.410 ...

Page 12

MIC39300/39301 0.065 0.010 20 2 0.100 BSC DIM. = INCH 0.065 0.010 20 2 0.067 0.005 DIM. = INCH MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in ...

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