MIC37100/37101/37102
1A Low-Voltage µCap LDO
General Description
Features
The MIC37100, MIC37101, and MIC37102 are 1A low-
•
Fixed and adjustable output voltages to 1.24V
dropout, linear voltage regulators that provide low-voltage,
•
µCap Regulator, 10µF ceramic output capacitor stable
high-current output from an extremely small package.
•
280mV typical dropout at 1A
Utilizing Micrel’s proprietary Super
βeta
PNP
®
pass
– Ideal for 3.0V to 2.5V conversion
element, the MIC37100/01/02 offers extremely low dropout
– Ideal for 2.5V to 1.8V, 1.65V or 1.5V conversion
(typically 280mV at 1A) and low ground current (typically
•
1A minimum guaranteed output current
11mA at 1A).
•
1% initial accuracy
The MIC37100 is a
fixed
output regulator offered in the
SOT-223 package. The MIC37101 and MIC37102 are
•
Low ground current
fixed
and adjustable regulators, respectively, in a thermally
•
Current limiting and thermal shutdown
enhanced power 8-pin SOIC (small outline package) and
•
Reversed-leakage protection
the SOT-223 package. The MIC37102 is also available in
•
Fast transient response
the S-PAK power package, for applications that require
•
Low-profile SOT-223 package
higher power dissipation or higher operating ambient
•
Power SO-8 package
temperatures.
•
S-PAK package (MIC37102 only)
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
Applications
voltage of 500mV over all operating conditions allows the
•
LDO linear regulator for PC add-in cards
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.
•
PowerPC
®
power supplies
The MIC37100/01/02 is fully protected with overcurrent
•
High-efficiency linear power supplies
limiting and thermal shutdown. Fixed output voltages of
•
SMPS post regulator
1.5V, 1.65V, 1.8V, 2.5V and 3.3V are available on
•
Multimedia and PC processor supplies
MIC37100/01 with adjustable output voltages to 1.24V on
•
Battery chargers
MIC37102.
•
Low-voltage microcontrollers and digital logic
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
350
Dropout
vs. Output Current
2.5V
OUT
DROPOUT (mV)
V
IN
3.3V
MIC37100
OUT
IN
GND
300
2.5V
10F
ceramic
250
200
150
100
50
3.3V
OUT
2.5V/1A Regulator
0
0
0.25
0.5
0.75
OUTPUT CURRENT (A)
1
Super
βeta
PNP is a registered trademark of Micrel, Inc.
PowerPC is a registered trademark of IBM Corporation
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2007
1
M9999-061407
Micrel, Inc.
MIC37100/37101/37102
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .......................................... 0V to +6.5V
Enable Voltage (V
EN
)...................................................+6.5V
Lead Temperature (soldering, 5 sec.)........................ 260°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(3)
Operating Ratings
(2)
Supply Voltage (V
IN
)...................................... +2.25V to +6V
Enable Voltage (V
EN
)............................................ 0V to +6V
Maximum Power Dissipation (P
D(max)
)
(4)
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
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
(6)
Min
–1
–2
Typ
Max
1
2
Units
%
%
%
%
pm/°C
mV
mV
mV
mV
µA
mA
mA
0.06
0.2
40
125
210
250
280
650
3.5
6.7
11
1.6
0.5
1
∆V
OUT
/∆T
V
DO
Output Voltage Temp. Coefficient
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%
200
350
400
500
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
25
2.5
mA
A
V
V
µA
µA
µA
µA
µA
mV
%
%
%
I
OUT(lim)
V
EN
I
EN
Current Limit
Enable Input Voltage
Enable Input Current
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
logic low (off)
logic high (on)
V
EN
= 2.25V
V
EN
= 0.8V
Enable Input
0.8
2.25
1
10
30
2
4
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
1.228
1.215
1.240
40
1.252
1.265
80
120
93
99.2
0.01
210
1
2
500
MIC37102 Only
Reference Voltage
Adjust Pin Bias Current
V
V
nA
nA
June 2007
4
M9999-061407
Micrel, Inc.
Notes:
1. Exceeding the absolute maximum rating 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.
MIC37100/37101/37102
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.
June 2007
5
M9999-061407
PCB Design
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