November 2000
1
MIC5236
MIC5236
Micrel
MIC5236
Low Quiescent Current
Cap LDO Regulator
Preliminary Information
General Description
The MIC5236 is a low quiescent current,
Cap low-dropout
regulator. With a maximum operating input voltage of 30V
and a quiescent current of 20
A, it is ideal for supplying keep-
alive power in systems with high-voltage batteries.
Capable of 150mA output, the MIC5236 has a dropout
voltage of only 300mV. It can also survive an input transient
of 20V to +60V.
As a
Cap LDO, the MIC5236 is stable with either a ceramic
or a tantalum output capacitor. It only requires a 1.0
F output
capacitor for stability.
The MIC5236 includes a logic compatible enable input and an
undervoltage error flag indicator. Other features of the
MIC5236 include thermal shutdown, current-limit, overvolt-
age shutdown, load-dump protection, reverse leakage pro-
tections, and reverse battery protection.
Available in the thermally enhanced SOP-8 and MSOP-8, the
MIC5236 comes in fixed 2.5V, 3.0V, 3.3V, 5.0V, and adjust-
able voltages. For other output voltages, contact Micrel.
Typical Application
I
GND
= 20
A
V
OUT
3.0V/100
A
V
IN
30V
IN
MIC5236
EN
OUT
GND
ERR
Regulator with Low I
O
and Low I
Q
Features
Ultra-low quiescent current (I
Q
= 20
A @I
O
= 100
A)
Wide input range: 2.3V to 30V
Low dropout:
230mV @50mA;
300mV @150mA
Fixed 2.5V, 3.0V, 3.3V, 5.0V, and Adjustable outputs
1.0% initial output accuracy
Stable with ceramic or tantalum output capacitor
Load dump protection: 20V to +60V input transient
survivability
Logic compatible enable input
Low output flag indicator
Overcurrent protection
Thermal shutdown
Reverse-leakage protection
Reverse-battery protection
High-power SOP-8 and MSOP-8
Applications
Keep-alive supply in notebook and
portable personal computers
Logic supply from high-voltage batteries
Automotive electronics
Battery-powered systems
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
C
OUT
V
OUT
3.0V/150mA
V
IN
5V
V
ERR
IN
MIC5236
EN
47k
OUT
GND
ERR
Regulator with Error Output
V
OUT
3.0V/150mA
V
IN
5V
IN
MIC5236
EN
OUT
GND
ADJ
Regulator with Adjustable Output
MIC5236
Micrel
MIC5236
2
November 2000
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
1
/ERR
Error (Output): Open-collector output is active low when the output is out of
regulation due to insufficient input voltage or excessive load. An external
pull-up resistor is required.
1
ADJ
Adjustable Feedback Input. Connect to voltage divider network.
2
2
IN
Power supply input.
3
3
OUT
Regulated Output
4
4
EN
Enable (Input): Logic low = shutdown; logic high = enabled.
58
58
GND
Ground: Pins 5, 6, 7, and 8 are internally connected in common via the
leadframe.
Pin Configuration
1
IN
OUT
EN
8
GND
GND
GND
GND
7
6
5
2
3
4
ERR
8-Pin SOIC (M)
8-Pin MSOP (MM)
Ordering Information
Part Number *
Voltage
Junction Temp. Range
Package
MIC5236-5.0BM
5.0V
40
C to +125
C
8-lead SOIC
MIC5236-5.0BMM
5.0V
40
C to +125
C
8-lead MSOP
MIC5236-3.3BM
3.3V
40
C to +125
C
8-lead SOIC
MIC5236-3.3BMM
3.3V
40
C to +125
C
8-lead MSOP
MIC5236-3.0BM
3.0V
40
C to +125
C
8-lead SOIC
MIC5236-3.0BMM
3.0V
40
C to +125
C
8-lead MSOP
MIC5236-2.5BM
2.5V
40
C to +125
C
8-lead SOIC
MIC5236-2.5BMM
2.5V
40
C to +125
C
8-lead MSOP
MIC5236BM
ADJ
40
C to +125
C
8-lead SOIC
MIC5236BMM
ADJ
40
C to +125
C
8-lead MSOP
*Conta5ct factory regarding availablity for voltages not listed
1
IN
OUT
EN
8
GND
GND
GND
GND
7
6
5
2
3
4
ADJ
8-Pin SOIC (M)
8-Pin MSOP (MM)
November 2000
3
MIC5236
MIC5236
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
), Note 3 ........................ 20V to +60V
Power Dissipation (P
D
), Note 4 ............... Internally Limited
Junction Temperature (T
J
) ...................................... +150
C
Storage Temperature (T
S
) ....................... 65
C to +150
C
Lead Temperature (soldering, 5 sec.) ....................... 260
C
ESD Rating, Note 5
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) ................................... + 2.3V to +30V
Junction Temperature (T
J
) ....................... 40
C to +125
C
Package Thermal Resistance
MSOP
(
JA
) ......................................................... 80
C/W
SOIC
(
JA
) ........................................................... 63
C/W
Electrical Characteristics
V
IN
= 6.0V; V
EN
= 2.0V; C
OUT
= 4.7
F, I
OUT
= 100
A; T
J
= 25
C, bold values indicate 40
C
T
J
+125
C; unless noted.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
OUT
Output Voltage Accuracy
variation from nominal V
OUT
1
1
%
2
+2
%
V
OUT
/
T
Output Voltage
Note 6
50
ppm/
C
Temperature Coefficient
V
OUT
/V
OUT
Line Regulation
V
IN
= V
OUT
+ 1V to 30V
0.2
0.5
%
1.0
%
V
OUT
/V
OUT
Load Regulation
I
OUT
= 100
A to 50mA, Note 7
0.15
0.3
%
0.5
%
I
OUT
= 100
A to 150mA, Note 7
0.3
0.6
%
1.0
%
V
Dropout Voltage, Note 8
I
OUT
= 100
A
50
100
mV
I
OUT
= 50mA
230
400
mV
I
OUT
= 100mA
270
mV
I
OUT
= 150mA
300
500
mV
I
GND
Ground Pin Current
V
EN
2.0V, I
OUT
= 100
A
20
30
A
V
EN
2.0V, I
OUT
= 50mA
0.5
0.8
mA
V
EN
2.0V, I
OUT
= 100mA
1.5
mA
V
EN
2.0V, I
OUT
= 150mA
2.8
4.0
mA
5.0
mA
I
GND(SHDN)
Ground Pin in Shutdown
V
EN
0.6V, V
IN
= 30V
0.1
1
A
I
SC
Short Circuit Current
V
OUT
= 0V
260
350
mA
e
n
Output Noise
10Hz to 100kHz, V
OUT
= 3.0V, C
L
= 1.0
F
160
Vrms
/ERR Output
V
/ERR
Low Threshold
% of V
OUT
90
94
%
High Threshold
% of V
OUT
95
98
%
V
OL
/ERR Output Low Voltage
V
IN
= V
OUT(nom)
0.12V
OUT
, I
OL
= 200
A
150
250
mV
400
mV
I
LEAK
/ERR Output Leakage
V
OH
= 30V
0.1
1
A
2
A
Enable Input
V
IL
Input Low Voltage
regulator off
0.6
V
V
IH
Input High Voltage
regulator on
2.0
V
MIC5236
Micrel
MIC5236
4
November 2000
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
IN
Enable Input Current
V
EN
= 0.6V, regulator off
0.01
1.0
A
2.0
A
V
EN
= 2.0V, regulator on
0.15
1.0
A
2.0
A
V
EN
= 30V, regulator on
0.5
2.5
A
5.0
A
Note 1.
Exceeding the absolute maximum rating may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3:
The absolute maximum positive supply voltage (60V) must be of limited duration (
100ms) and duty cycle (
1%). The maximum continuous
supply voltage is 30V.
Note 4:
The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
T
A
)
JA
. Exceeding the maximum
allowable power dissipation will result in excessive die termperature, and the regulator will go into thermal shutdown. The
JA
of the
MIC5236-x.xBM (all versions) is 63
C/W, and the MIC5236-x.xBMM (all versions) is 80
C/W, mounted on a PC board (see "Thermal Charac-
teristics" for further details).
Note 5.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 6:
Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
Note 7:
Regulation is measured at constant junction temperature using pulse testing with a low duty-cycle. Changes in output voltage due to heating
effects are covered by the specification for thermal regulation.
Note 8:
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1.0V
differential.
November 2000
5
MIC5236
MIC5236
Micrel
Typical Characteristics
0
100
200
300
400
0
40
80
120
160
200
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
MIC5236-3.0
V
OUT
= 98% of Nominal V
OUT
1.0
1.5
2.0
2.5
3.0
3.5
1.5
2.0
2.5
3.0
3.5
4.0
OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
Dropout Characteristics
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 150mA
MIC5236-3.0
0
100
200
300
400
500
600
-40 -20 0
20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (
C)
Dropout Voltage
vs. Temperature
I
LOAD
= 150mA
MIC5236-3.0
0
1
2
3
4
0
20 40 60 80 100 120 140 160
GROUND PIN CURRENT (mA)
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
V
IN
= 4V
V
IN
= 10V
MIC5236-3.0
0
5
10
15
20
25
0
100
200
300
400
500
GROUND PIN CURRENT (
A)
OUTPUT CURRENT (
A)
Ground Pin Current
vs. Output Current
V
IN
= 10V
V
IN
= 4V
MIC5236-3.0
0
1
2
3
4
5
0
1
2
3
4
5
6
7
8
GROUND CURRENT (mA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
I
LOAD
= 100
A
V
OUT
= 3V
MIC5236-3.0
I
LOAD
= 150mA
0
10
20
30
40
50
60
70
80
90
100
0
1
2
3
4
5
6
7
8
GROUND PIN CURRENT (
A)
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
I
LOAD
= 10mA
MIC5236-3.0
1mA
100
A
10
A
0
0.02
0.04
0.06
0.08
0.10
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Current
vs. Temperature
V
IN
= 4V
I
LOAD
= 10mA
MIC5236-3.0
0
0.2
0.4
0.6
0.8
1.0
1.2
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Current
vs. Temperature
V
IN
= 4V
I
LOAD
= 75mA
MIC5236-3.0
0
1
2
3
4
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Current
vs. Temperature
V
IN
= 4V
I
LOAD
= 150mA
MIC5236-3.0
2.985
2.990
2.995
3.000
3.005
3.010
3.015
-40 -20 0
20 40 60 80 100 120
VOLTAGE OUTPUT (V)
TEMPERATURE (
C)
Output Voltage
vs. Temperature
V
IN
= 4V
I
LOAD
= 150mA
MIC5236-3.0
255
260
265
270
275
280
285
-40 -20 0
20 40 60 80 100 120
SHORT CIRCUIT CURRENT (mA)
TEMPERATURE (
C)
Short Circuit Current
vs. Temperature
V
OUT
= 0V
MIC5236-3.0
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