MIC37501/37502
5A, Low Voltage µCap LDO Regulator
General Description
The MIC37501 and MIC37502 are 5A, low dropout
linear voltage regulator that provide low voltage, high
current outputs with a minimum of external components.
They offer high precision, ultra-low dropout (500mV),
and low ground current.
The MIC37501and MIC37502 operate from an input of
2.3V to 6.0V. They are designed to drive digital circuits
requiring low voltage at high currents (i.e., PLDs, DSPs,
microcontrollers, etc.). They are available in fixed and
adjustable output voltages. Fixed voltages include 1.5V,
1.65V, 1.8V, 2.5V, and 3.3V. The adjustable version is
capable of 1.24V to 5.5V.
MIC37501 and MIC37502 LDOs feature thermal and
currentlimit protection and reverse current protection.
Logic enable and error flag pins are available.
Junction temperature range of the MIC37501/02 is from
–40°C to 125°C.
For applications requiring input voltage greater than
6.0V, see MIC3910x, MIC3915x, MIC3930x, and
MIC3950x LDOs.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Features
•
5A minimum guaranteed output current
•
500mV maximum dropout voltage
–
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:
-
V
IN
: 2.3V to 6.0V
•
±1.0% initial output tolerance
•
Fixed and adjustable output voltages:
– MIC37501—7 terminal fixed voltage
– MIC37502—5 (TO-263) and 7 (SPAK) terminal
adjustable voltage
•
Excellent line and load regulation specifications
•
Logic controlled shutdown
•
Thermal shutdown and current-limit protection
•
Reverse-leakage protection
•
Low profile S-Pak and TO-263 packages
Applications
•
•
•
•
•
LDO linear regulator for low-voltage digital IC
PC add-in cards
High efficiency linear power supplies
SMPS post regulator
Battery charger
Typical Applications
V
IN
= 3.0V
C
IN
MIC37501
VIN
VIN
VEN
GND
DROPOUT (mV)
VOUT
VOUT
FLG
100k
V
OUT
= 2.5V
C
OUT
100F, Ceramic
450
400
350
300
250
200
150
100
50
0
0
Dropout
vs. Output Current
Fixed 2.5V Regulator with Error Flag
V
IN
C
IN
2.5V
OUT
MIC37502
VIN
VIN
VEN
GND
VOUT
VOUT
ADJ
R2
R1
1.3V
C
OUT
100F, Ceramic
1
2
3
4
OUTPUT CURRENT (A)
5
Adjustable Regulator
Super
βeta
is a registered trademark of Micrel Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2007
1
M9999-020507
MICREL [ MICREL SEMICONDUCTOR ]
