MIC39100/39101/39102
Micrel
MIC39100/39101/39102
1A Low-Voltage Low-Dropout Regulator
General Description
The MIC39100, MIC39101, and MIC39102 are 1A low-dropout
linear voltage regulators that provide low-voltage, high-current
output from an extremely small package. Utilizing Micrel’s pro-
prietary Super
βeta
PNP™ pass element, the MIC39100/1/2
offers extremely low dropout (typically 410mV at 1A) and low
ground current (typically 11mA at 1A).
The MIC39100 is a fixed output regulator offered in the
SOT-223 package. The MIC39101 and MIC39102 are fixed
and adjustable regulators, respectively, in a thermally en-
hanced power 8-lead SOIC package.
The MIC39100/1/2 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. A guaranteed maximum dropout voltage of 630mV over
all operating conditions allows the MIC39100/1/2 to provide
2.5V from a supply as low as 3.13V and 1.8V from a supply
as low as 2.43V.
The MIC39100/1/2 is fully protected with overcurrent limit-
ing, thermal shutdown, and reversed-battery protection.
Fixed voltages of 5.0V, 3.3V, 2.5V, and 1.8V are available
on MIC39100/1 with adjustable output voltages to 1.24V on
MIC39102.
For other voltages, contact Micrel.
Features
• Fixed and adjustable output voltages to 1.24V
• 410mV typical dropout at 1A
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V conversion
• 1A minimum guaranteed output current
• 1% initial accuracy
• Low ground current
• Current limiting and thermal shutdown
• Reversed-battery protection
• Reversed-leakage protection
• Fast transient response
• Low-profile SOT-223 package
• Power SO-8 package
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
Typical Applications
100k
V
IN
3.3V
MIC39100
IN
OUT
GND
2.5V
10µF
tantalum
V
IN
3.3V
ENABLE
SHUTDOWN
MIC39101
IN
EN
OUT
FLG
GND
R1
Error
Flag
Output
2.5V
10µF
tantalum
V
IN
2.5V
ENABLE
SHUTDOWN
MIC39102
IN
OUT
EN
ADJ
GND
R1
R2
1.5V
10µF
tantalum
2.5V/1A Regulator
2.5V/1A Regulator with Error Flag
1.5V/1A Adjustable Regulator
Super
βeta
PNP is a 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
August 2005
1
M9999-082505-B
MIC39100/39101/39102
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
) .......................................–20V to +20V
Enable Voltage (V
EN
) .................................................. +20V
Storage Temperature (T
S
) ........................ –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ........................ 260°C
ESD,
Note 3
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) ................................... +2.25V to +16V
Enable Voltage (V
EN
) .................................................. +16V
Maximum Power Dissipation (P
D(max)
) .....................
Note 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
Electrical Characteristics
(Note 12)
Symbol
V
OUT
V
IN
= V
OUT
+ 1V; V
EN
= 2.25V; T
J
= 25°C,
bold
values indicate –40°C ≤ T
J
≤ +125°C; unless noted
Parameter
Condition
Output Voltage
Line Regulation
Load Regulation
ΔV
OUT
/ΔT
ppm/°C
V
DO
Output Voltage Temp. Coefficient,
Note 5
Dropout Voltage,
Note 6
I
OUT
= 100mA, ΔV
OUT
= –1%
I
OUT
= 500mA, ΔV
OUT
= –1%
I
OUT
= 1A, ΔV
OUT
= –1%
140
275
330
410
400
4
6.5
11
1.8
20
2.5
0.8
2.25
1
15
30
75
2
4
0.01
210
93
99.2
1
1
2
300
400
500
550
630
200
250
mV
mV
mV
mV
mV
mV
µA
mA
mA
mA
A
V
V
µA
µA
µA
µA
µA
µA
mV
mV
%
%
%
10mA
10mA ≤ I
OUT
≤ 1A, V
OUT
+ 1V ≤ V
IN
≤ 8V
I
OUT
= 10mA, V
OUT
+ 1V ≤ V
IN
≤ 16V
V
IN
= V
OUT
+ 1V, 10mA ≤ I
OUT
≤ 1A,
Min
–1
–2
0.06
0.2
40
Typ
Max
1
2
0.5
1
100
Units
%
%
%
%
I
OUT
= 750mA, ΔV
OUT
= –1%
I
GND
Ground Current,
Note 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)
V
EN
I
EN
Current Limit
Enable Input Voltage
Enable Input Current
Enable Input
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
logic low (off)
logic high (on)
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
= 16V
V
IN
= 2.250V, I
OL
, = 250µA,
Note 9
% of V
OUT
% of V
OUT
August 2005
3
M9999-082505-B
MIC39100/39101/39102
Symbol
Parameter
Reference Voltage
Note 10
Adjust Pin Bias Current
Reference Voltage
Temp. Coefficient
Adjust Pin Bias Current
Temp. Coefficient
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
Note 9.
Exceeding the absolute maximum ratings may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
P
D(max)
= (T
J(max)
– T
A
)
÷ θ
JA
, where
θ
JA
depends upon the printed circuit layout. See “Applications Information.”
Output voltage temperature coefficient is ΔV
OUT(worst case)
÷
(T
J(max)
– T
J(min)
) where T
J(max)
is +125°C and T
J(min)
is –40°C.
Micrel
Condition
Min
1.228
1.215
1.203
Typ
1.240
Max
1.252
1.265
1.277
80
120
Units
V
V
V
nA
nA
MIC39102 Only
40
Note 7
20
ppm/°C
0.1
nA/°C
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.
I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
V
EN
≤ 0.8V, V
IN
≤ 8V, and V
OUT
= 0V.
For a 2.5V device, V
IN
= 2.250V (device is in dropout).
Note 11.
Thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 200mA load pulse at V
IN
= 16V for t = 10ms.
Note 12.
Specification for packaged product only.
Note 10.
V
REF
≤ V
OUT
≤ (V
IN
– 1V), 2.25V ≤ V
IN
≤ 16V, 10mA ≤ I
L
≤ 1A, T
J
= T
MAX
.
M9999-082505
4
August 2005
MIC39100/39101/39102
Micrel
Typical Characteristics
P ower S upply
R ejec tion R atio
V
IN
= 5V
V
OUT
= 3.3V
80
80
P ower S upply
R ejec tion R atio
V
IN
= 5V
V
OUT
= 3.3V
80
P ower S upply
R ejec tion R atio
V
IN
= 3.3V
V
OUT
= 2.5V
60
PSRR (dB)
60
PSRR (dB)
60
PSRR (dB)
40
20
I
OUT
= 1A
C
OUT
= 10µF
C
IN
= 0
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
1k
10k 100k 1M
10
100
FREQUENCY (Hz)
40
20
I
OUT
= 1A
C
OUT
= 47µF
C
IN
= 0
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
1k
10k 100k 1M
10
100
FREQUENCY (Hz)
40
20
I
OUT
= 1A
C
OUT
= 10µF
C
IN
= 0
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
1k
10k 100k 1M
10
100
FREQUENCY (Hz)
80
P ower S upply
R ejec tion R atio
V
IN
= 3.3V
V
OUT
= 2.5V
60
PSRR (dB)
40
20
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
1k
10k 100k 1M
10
100
FREQUENCY (Hz)
I
OUT
= 1A
C
OUT
= 47µF
C
IN
= 0
500
450
400
350
300
250
200
150
100
50
0
Dropout V oltage
vs . Output C urrent
2.5V
600
550
DROPOUT VOLTAGE (mV)
Dropout V oltage
vs . T emperature
I
LOAD
= 1A
DROPOUT VOLTAGE (mV)
3.3V
500
1.8V
3.3V
1.8V
T
A
= 25°C
450
400
350
300
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
2.5V
0
250 500 750 1000 1250
OUTPUT CURRENT (mA)
2.8
2.6
OUTPUT VOLTAGE (V)
2.4
2.2
2.0
1.8
1.6
1.4
2
Dropout C harac teris tic s
(2.5V )
I LOAD =100mA
OUTPUT VOLTAGE (V)
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.8
Dropout C harac teris tic s
(3.3V )
I LOAD =100mA
GROUND CURRENT (mA)
14
12
10
8
6
4
2
0
0
G round C urrent
vs . Output C urrent
1.8V
2.5V
3.3V
I LOAD =750mA
I LOAD =750mA
I LOAD =1A
I LOAD =1A
2.3
2.6
2.9
3.2
SUPPLY VOLTAGE (V)
3.5
3.2
3.6
4.0
SUPPLY VOLTAGE (V)
4.4
200 400 600 800
OUTPUT CURRENT (mA)
1000
GROUND CURRENT (mA)
GROUND CURRENT (mA)
GROUND CURRENT (mA)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
G round C urrent
vs . S upply V oltage (2.5V )
35
30
25
20
15
10
5
0
0
G round C urrent
vs . S upply V oltage (2.5V )
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
G round C urrent
vs . S upply V oltage (3.3V )
I LOAD
=
100mA
I LOAD =100mA
I LOAD =1A
I LOAD
=
10mA
I LOAD =10mA
0
2
4
6
SUPPLY VOLTAGE (V)
8
2
4
6
SUPPLY VOLTAGE (V)
8
2
4
6
SUPPLY VOLTAGE (V)
8
August 2005
5
M9999-082505-B
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