MIC37100/37101/37102
Micrel
MIC37100/37101/37102
1A Low-Voltage
µ
Cap LDO Regulator
General Description
The MIC37100, MIC37101, and MIC37102 are 1A low-
dropout, linear voltage regulators that provide low-voltage,
high-current output from an extremely small package. Utiliz-
ing Micrel’s proprietary Super
βeta
PNP™ pass element, the
MIC37100/01/02 offers extremely low dropout (typically
280mV at 1A) and low ground current (typically 11mA at 1A).
The MIC37100 is a fixed output regulator offered in the
SOT-223 package. The MIC37101 and MIC37102 are fixed
and adjustable regulators, respectively, in a thermally en-
hanced power 8-lead SOIC (small outline package) and the
SOT-223 package. The MIC37102 is also available in the S-
PAK power package, for applications that require higher
power dissipation or higher operating ambient temperatures.
The MIC37100/01/02 is ideal for PC add-in cards that need
to convert from standard 5V to 3.3V, 3.3V to 2.5V or 2.5V to
1.8V or lower. A guaranteed maximum dropout voltage of
500mV over all operating conditions allows the
MIC37100/01/02 to provide 2.5V from a supply as low as 3V
and 1.8V from a supply as low as 2.3V.
The MIC37100/01/02 is fully protected with overcurrent lim-
iting and thermal shutdown. Fixed output voltages of 1.5V,
1.65V, 1.8V, 2.5V and 3.3V are available on MIC37100/01
with adjustable output voltages to 1.24V on MIC37102.
Features
• Fixed and adjustable output voltages to 1.24V
µ
•
µ
Cap Regulator, 10µF ceramic output capacitor
stable
• 280mV typical dropout at 1A
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V, 1.65V or 1.5V conversion
• 1A minimum guaranteed output current
• 1% initial accuracy
• Low ground current
• Current limiting and thermal shutdown
• Reversed-leakage protection
• Fast transient response
• Low-profile SOT-223 package
• Power SO-8 package
• S-PAK package (MIC37102 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
Battery chargers
Low-voltage microcontrollers and digital logic
For other voltages, contact Micrel.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Typical Applications
Dropout
vs. Output Current
350
DROPOUT (mV)
V
IN
3.3V
MIC37100
IN
OUT
GND
300
2.5V
OUT
2.5V
10µF
ceramic
250
200
150
100
50
0
0
0.25
0.5
0.75
OUTPUT CURRENT (A)
1
3.3V
OUT
2.5V/1A Regulator
Super
βeta
PNP is a registered trademark of Micrel, Inc.
PowerPC is a trademark of IBM Corporation.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2004
1
M9999-091604
MIC37100/37101/37102
Micrel
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ........................................ 0V to +6.5V
Enable Voltage (V
EN
) ................................................. +6.5V
Storage Temperature (T
S
) ....................... –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD ................................................................................
(3)
Operating Ratings
(2)
Supply Voltage (V
IN
) .................................... +2.25V to +6V
Enable Voltage (V
EN
) .......................................... 0V to +6V
Maximum Power Dissipation (P
) ...........................
(4)
D(max)
Junction Temperature (T
J
) ....................... –40°C to +125°C
Package Thermal Resistance
SOT-223
(θ
JC
) ..................................................... 15°C/W
SOIC-8
(θ
JC
) ....................................................... 20°C/W
S-PAK-5
(θ
JC
) ....................................................... 2°C/W
Electrical Characteristics
V
IN
= V
OUT
+ 1V; V
EN
= 2.25V; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted
Symbol
V
OUT
Parameter
Output Voltage
Line Regulation
Load Regulation
∆V
OUT
/∆T
V
DO
Output Voltage Temp. Coefficient
(6)
Dropout Voltage
(6)
I
OUT
= 100mA,
∆V
OUT
= –1%
I
OUT
= 500mA,
∆V
OUT
= –1%
I
OUT
= 750mA,
∆V
OUT
= –1%
I
OUT
= 1A,
∆V
OUT
= –1%
I
GND
Ground Current
(7)
I
OUT
= 100mA, V
IN
= V
OUT
+ 1V
I
OUT
= 500mA, V
IN
= V
OUT
+ 1V
I
OUT
= 750mA, V
IN
= V
OUT
+ 1V
I
OUT
= 1A, V
IN
= V
OUT
+ 1V
I
OUT(lim)
Enable Input
V
EN
I
EN
Enable Input Voltage
logic low (off)
logic high (on)
Enable Input Current
V
EN
= 2.25V
V
EN
= 0.8V
Flag Output
I
FLG(leak)
V
FLG(do)
V
FLG
Output Leakage Current
Output Low Voltage
Low Threshold
High Threshold
Hysteresis
V
OH
= 6V
V
IN
= 2.250V, I
OL
, = 250µA
% of V
OUT
% of V
OUT
1
93
99.2
0.01
210
1
2
500
µA
µA
mV
%
%
%
2.25
1
10
30
2
4
0.8
V
V
µA
µA
µA
Current Limit
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
Condition
10mA
10mA
≤
I
OUT
≤
1A, V
OUT
+ 1V
≤
V
IN
≤
6V
I
OUT
= 10mA, V
OUT
+ 1V
≤
V
IN
≤
6V
V
IN
= V
OUT
+ 1V, 10mA
≤
I
OUT
≤
1A,
Min
–1
–2
0.06
0.2
40
125
210
250
280
650
3.5
6.7
11
1.6
25
2.5
200
350
400
500
Typ
Max
1
2
0.5
1
Units
%
%
%
%
ppm/°C
mV
mV
mV
mV
mA
mA
mA
mA
A
M9999-091604
4
September 2004
MIC37100/37101/37102
Symbol
Parameter
Condition
Min
Typ
Max
Micrel
Units
MIC37102 Only
Reference Voltage
Adjust Pin Bias Current
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. P
D
(max) = (T
J
(max) – T
A
)
÷ θ
JA
, where
θ
JA
depends upon the printed circuit layout. See
“
Applications Information” section.
5. Output voltage temperature coefficient is
∆V
OUT
(worst case)
÷
(T
J
(max) – T
J
(min)) where T
J
(max) is +125°C and T
J
(min) is –40°C.
6. V
DO
= V
IN
– V
OUT
when V
OUT
decreases to 98% of its nominal output voltage with V
IN
= V
OUT
+ 1V. For output voltages below 2.25V, dropout
voltage is the input-to-output voltage differential with the minimum input voltage being 2.25V. Minimum input operating voltage is 2.25V.
7. I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
8. V
EN
≤
0.8V, V
IN
≤
6V, and V
OUT
= 0V.
1.228
1.215
1.240
40
1.252
1.265
80
120
V
V
nA
nA
September 2004
5
M9999-091604
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