MIC37300(2003) 查看數據表（PDF） - Micrel
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MIC37300 Datasheet PDF : 12 Pages
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MIC37300/37301/37302
Micrel
MIC37300/37301/37302
3.0A, Low-Voltage µCap LDO Regulator
General Description
The Micrel MIC37300/01/02 is a 3.0A low-dropout linear
voltage regulator that provides a low-voltage, high-current
output with a minimum number of external components. It
offers high precision, ultra-low-dropout (500mV overtem-
perature), and low-ground current.
The MIC37300/01/02 operates from an input of 2.25V to
6.0V. It is designed to drive digital circuits requiring low-
voltage at high currents (i.e., PLDs, DSP, microcontroller,
etc.). It is available in fixed and adjustable output voltages.
Fixed voltages include 1.5V, 1.8V, 2.5V and 3.3V. The
adjustable version is capable of 1.24V to 5.5V.
Features of the MIC37300/01/02 LDO include thermal and
current-limit protection, and reverse-current protection. Logic
enable and error flag pins are available on the 5-pin version.
Junction temperature range of the MIC37300/01/02 is from
–40°C to 125°C.
For applications requiring input voltage greater than 6.0V,
see the MIC3910x, MIC3915x, MIC3930x, and MIC3950x
LDOs.
All data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Features
• 3.0A minimum guaranteed output current
• 500mV maximum dropout-voltage overtemperature
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V, 1.65V, or 1.5V conversion
• Stable with ceramic or tantalum capacitor
• Wide input voltage range:
VIN: 2.25V to 6.0V
• +1.0% initial output tolerance
• Fixed and adjustable output voltages:
MIC37300 — 3-pin fixed
MIC37301 — 5-pin fixed with flag
MIC37302 — 5-pin adjustable
• Excellent line and load regulation specifications
• Logic controlled shutdown
• Thermal shutdown and current-limit protection
• Reverse-leakage protection
• Low profile S-Pak package
Applications
• LDO linear regulator for low-voltage digital IC
• PC add-in cards
• High-efficiency linear power supplies
• SMPS post regulator
• Battery charger
Typical Application
VIN = 3.0V
MIC37300
VIN
VOUT
GND
VOUT = 2.5V
COUT
47µF, Ceramic
VIN
CIN
MIC37302
VIN
VOUT
R1
VEN
ADJ
GND
R2
1.3V
COUT
47µF, Ceramic
Fixed 2.5V Regulator
Adjustable Regulator
VIN = 3.0V
CIN
MIC37301
VIN
VOUT
VEN
FLG
GND
100k
VOUT = 2.5V
COUT
47µF, Ceramic
Fixed 2.5V Regulator with Error Flag
Super ßeta PNP is a registered trademark of Micrel, Inc.
Dropout vs.
Output Current
500
450
400
350
300 2.5VOUT
250
200
150
3.3VOUT
100
50
0
0 0.5 1 1.5 2 2.5 3
OUTPUT CURRENT (A)
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
November 2003
1
M0307-112003
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