MIC5236
Micrel, Inc.
MIC5236
Low Quiescent Current µCap LDO Regulator
General Description
The MIC5236 is a low quiescent current, µCap low-dropout
regulator. With a maximum operating input voltage of 30V and
a quiescent current of 20µA, it is ideal for supplying keep-alive
power in systems with high-voltage batteries.
Capable of 150mA output, the MIC5236 has a dropout volt-
age of only 300mV. It can also survive an input transient of
–20V to +60V.
As a µCap LDO, the MIC5236 is stable with either a ceramic
or a tantalum output capacitor. It only requires a 1.0µF 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, overvoltage
shutdown, load-dump protection, reverse leakage protections,
and reverse battery protection.
Available in the thermally enhanced SOIC-8 and MSOP-8, the
MIC5236 comes in fixed 2.5V, 3.0V, 3.3V, 5.0V, and adjustable
voltages. For other output voltages, contact Micrel.
Features
• Ultra-low quiescent current (I
Q
= 20µA @I
O
= 100µA)
• 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 SOIC-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
Typical Application
V
IN
30V
MIC5236
IN
OUT
EN
ERR
GND
V
OUT
3.0V/100µA
I
GND
= 20µA
V
IN
5V
MIC5236
IN
OUT
EN
ERR
GND
V
OUT
3.0V/150mA
V
ERR
47k
C
OUT
Regulator with Low I
O
and Low I
Q
V
IN
5V
MIC5236
IN
OUT
EN
ADJ
GND
Regulator with Error Output
V
OUT
3.0V/150mA
R1
R2
Regulator with Adjustable Output
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2005
1
MIC5236
MIC5236
Micrel, Inc.
Part Number*
Voltage
ADJ
ADJ
2.5V
2.5V
3.0V
3.0V
3.3V
3.3V
5.0V
5.0V
Junction Temp. Range
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Package
8-Pin SOIC
8-Pin MSOP
8-Pin SOIC
8-Pin MSOP
8-Pin SOIC
8-Pin MSOP
8-Pin SOIC
8-Pin MSOP
8-Pin SOIC
8-Pin MSOP
Ordering Information
Standard
MIC5236BM
MIC5236BMM
MIC5236-2.5BM
MIC5236-2.5BMM
MIC5236-3.0BM
MIC5236-3.0BMM
MIC5236-3.3BM
MIC5236-3.3BMM
MIC5236-5.0BM
MIC5236-5.0BMM
Pb-Free
MIC5236YM
MIC5236YMM
MIC5236-2.5YM
MIC5236-2.5YMM
MIC5236-3.0YM
MIC5236-3.0YMM
MIC5236-3.3YM
MIC5236-3.3YMM
MIC5236-5.0YM
MIC5236-5.0YMM
* Contact factory regarding availability for voltages not listed
Pin Configuration
ERR
1
IN 2
OUT 3
EN 4
8 GND
7 GND
6 GND
5 GND
ADJ
1
IN 2
OUT 3
EN 4
8 GND
7 GND
6 GND
5 GND
8-Pin SOIC (M)
8-Pin MSOP (MM)
8-Pin SOIC (M)
8-Pin MSOP (MM)
Pin Description
Pin Number
Pin Number
1
Pin Name
/ERR
Pin Function
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.
Adjustable Feedback Input. Connect to voltage divider network.
Power supply input.
Regulated Output
Enable (Input): Logic low = shutdown; logic high = enabled.
Ground: Pins 5, 6, 7, and 8 are internally connected in common via the lead-
frame.
1
2
3
4
5–8
2
3
4
5–8
ADJ
IN
OUT
EN
GND
MIC5236
2
July 2005
MIC5236
Micrel, Inc.
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
(θ
JA
)
........................................................................
80°C/W
SOIC
(θ
JA
) .......................................................... 63°C/W
Electrical Characteristics
V
IN
= 6.0V; V
EN
= 2.0V; C
OUT
= 4.7µF, I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C ≤ T
J
≤ +125°C; unless noted.
Symbol
Parameter
Conditions
Min
–1
–2
50
Typ
V
OUT
ΔV
OUT
/ΔT
ppm/°C
ΔV
OUT
/V
OUT
ΔV
OUT
/V
OUT
Output Voltage Accuracy
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
V
IN
= V
OUT
+ 1V to 30V
I
OUT
= 100µA to 50mA,
Note 7
I
OUT
= 100µA to 150mA,
Note 7
ΔV
Dropout Voltage,
Note 8
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
I
GND
Ground Pin Current
V
EN
≥ 2.0V, I
OUT
= 100µA
I
OUT
= 150mA
0.2
0.15
0.3
50
230
270
300
20
0.5
1.5
2.8
0.1
260
160
90
94
95
150
0.1
98
250
400
1
2
0.6
2.0
4.0
5.0
1
350
500
30
0.8
0.5
1.0
0.3
0.5
0.6
1.0
100
400
%
%
%
%
%
%
mV
mV
mV
mV
µA
mA
mA
mA
mA
µA
mA
µVrms
%
%
mV
mV
µA
µA
V
V
variation from nominal V
OUT
Note 6
Max
1
+2
Units
%
%
V
EN
≥ 2.0V, I
OUT
= 50mA
V
EN
≥ 2.0V, I
OUT
= 100mA
V
EN
≥ 2.0V, I
OUT
= 150mA
I
GND(SHDN)
I
SC
e
n
Ground Pin in Shutdown
Short Circuit Current
Output Noise
Low Threshold
High Threshold
/ERR Output Low Voltage
/ERR Output Leakage
V
OUT
= 0V
V
EN
≤ 0.6V, V
IN
= 30V
/ERR Output
V
/ERR
V
OL
I
LEAK
Enable Input
V
IL
Input Low Voltage
Input High Voltage
10Hz to 100kHz, V
OUT
= 3.0V, C
L
= 1.0µF
% of V
OUT
% of V
OUT
V
IN
= V
OUT(nom)
– 0.12V
OUT
, I
OL
= 200µA
V
OH
= 30V
regulator off
regulator on
V
IH
July 2005
3
MIC5236
MIC5236
Symbol
I
IN
Parameter
Enable Input Current
Conditions
V
EN
= 0.6V, regulator off
V
EN
= 2.0V, regulator on
V
EN
= 30V, regulator on
Note 1.
Note 2.
Note 3:
Note 4:
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Micrel, Inc.
Min
Typ
0.01
0.15
0.5
Max
1.0
2.0
1.0
2.0
2.5
5.0
Units
µA
µA
µA
µA
µA
µA
The absolute maximum positive supply voltage (60V) must be of limited duration (≤100ms) and duty cycle (≤1%). The maximum continuous
supply voltage is 30V.
The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) ÷
θ
JA
. Exceeding the maximum allow-
able power dissipation will result in excessive die termperature, and the regulator will go into thermal shutdown. The
θ
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 Characteristics” for
further details).
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
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.
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.
Note 5.
Note 6:
Note 7:
Note 8:
MIC5236
4
July 2005
51单片机
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