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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
September 2007
M9999-090607
Micrel, Inc.
MIC37100/37101/37102
Ordering Information
Part Number
Standard
MIC37100-1.5BS
MIC37100-1.65BS
MIC37100-1.8BS
MIC37100-2.5BS
MIC37100-3.3BS
MIC37101-1.5BM
MIC37101-1.65BM
MIC37101-1.8BM
Contact Factory
MIC37101-2.5BM
MIC37101-3.3BM
MIC37102BM
MIC37102BR
Pb-Free /
RoHS Compliant
MIC37100-1.5WS*
MIC37100-1.65WS*
MIC37100-1.8WS*
MIC37100-2.5WS*
MIC37100-3.3WS*
MIC37101-1.5YM
MIC37101-1.65YM
MIC37101-1.8YM
MIC37101-2.1YM
MIC37101-2.5YM
MIC37101-3.3YM
MIC37102YM
MIC37102WR*
1.5V
1.65V
1.8V
2.5V
3.3V
1.5V
1.65V
1.8V
2.1V
2.5V
3.3V
Adj.
Adj.
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
5-Pin S-PAK
Voltage
Temperature Range
Package
* RoHS compliant with ‘high-melting solder’ exemption.
Pin Configuration
GND
TAB
5
4
3
2
1
ADJ
OUT
GND
IN
EN
1
2
3
IN
GND OUT
5-Pin S-PAK (R)
MIC37102 (Adjustable)
SOT-223 (S)
MIC37100-x.x (Fixed)
EN 1
IN 2
OUT 3
FLG 4
8
7
6
5
GND
GND
GND
GND
EN 1
IN 2
OUT 3
ADJ 4
TAB
8
7
6
5
GND
GND
GND
GND
8-Pin SOIC
MIC37101-x.x (Fixed)
8-Pin SOIC
MIC37102 (Adjustable)
September 2007
2
M9999-090607
Micrel, Inc.
MIC37100/37101/37102
Pin Description
Pin Number
MIC37100
SOT-223
—
1
3
Pin Number
MIC37101
SOIC-8
1
2
3
4
Pin Number
MIC37102
SOIC-8
1
2
3
Pin Number
MIC37102
S-PAK
1
2
4
Pin Name
Pin Description
EN
IN
OUT
FLG
ADJ
GND
Enable (Input): CMOS-compatible control input. Logic
high = enable, logic low or open = shutdown.
Supply (Input).
Regulator Output.
Flag (Output): Open-collector error
flag
output. Active
low = output under voltage.
Adjustment Input: Feedback input. Connect to resistive
voltage-divider network.
Ground.
—
—
2, TAB
—
4
5–8
—
5
3, TAB
—
5–8
September 2007
3
M9999-090607
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
September 2007
4
M9999-090607
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