MIC5238
Ultra-Low Quiescent Current, 150mA
µCap LDO Regulator
General Description
The MIC5238 is an ultra-low voltage output, 150mA LDO
regulator. Designed to operate in a single supply or dual
supply mode, the MIC5238 consumes only 23µA of bias
current, improving efficiency. When operating in the dual
supply mode, the efficiency greatly improves as the higher
voltage supply is only required to supply the 23µA bias
current while the output and base drive comes off of the
much lower input supply voltage.
As a µCap regulator, the MIC5238 operates with a 2.2µF
ceramic capacitor on the output, offering a smaller overall
solution. It also incorporates a logic-level enable pin that
allows the MIC5238 to be put into a zero off-current mode
when disabled.
The MIC5238 is fully protected with current limit and
®
thermal shutdown. It is offered in the IttyBitty SOT-23-5
package with an operating junction temperature range of
–40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
Ultra-low input voltage range:1.5V to 6V
Ultra-low output voltage:1.0V minimum output voltage
Low dropout voltage: 310mV at 150mA
High output accuracy: ±2.0% over temperature
µCap: stable with ceramic or tantalum capacitors
Excellent line and load regulation specifications
Zero shutdown current
Reverse leakage protection
Thermal shutdown and current limit protection
IttyBitty
®
SOT-23-5 package
Applications
•
•
•
•
PDAs and pocket PCs
Cellular phones
Battery powered systems
Low power microprocessor power supplies
___________________________________________________________________________________________________________
Typical Application
Ultra-Low Voltage Application
IttyBitty is a registered 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
November 2009
M9999-111209
Micrel, Inc.
MIC5238
Absolute Maximum Ratings
(1)
Input Supply Voltage (V
IN
)................................. –0.3V to 7V
BIAS Supply Voltage (V
BIAS
).............................. –0.3V to 7V
Enable Supply Voltage (V
EN
)............................. –0.3V to 7V
Power Dissipation (P
D
). .............................Internally Limited
Junction Temperature (T
J
) ........................–40°C to +125°C
Storage Temperature (T
S
).........................–65°C to +150°C
ESD Rating
(3)
......................................................1.5µA HBM
Operating Ratings
(2)
Supply Voltage (V
IN
)............................................ 1.5V to 6V
BIAS Supply Voltage (V
BIAS
)................................ 2.3V to 6V
Enable Supply Voltage (V
EN
).................................. 0V to 6V
Junction Temperature (T
J
) ........................ –40°C to +125°C
Package Thermal Resistance
SOT-23-5 (θ
JA
) .................................................235°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
OUT
+ 1V; V
BIAS
= 3.3V; I
OUT
= 100µA; V
EN
= 2V,
bold
values indicate –40°C < T
J
< +125°C, unless
specified.
Parameter
Output Voltage Accuracy
Line Regulation
Input Line Regulation
Load Regulation
Dropout Voltage
Condition
Variation from nominal V
OUT
V
BIAS
= 2.3V to 6V,
Note 5
V
IN
= (V
OUT
1V) to 6V
Load = 100µA to 150mA
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
BIAS Current,
Note 6
Input Current,
Pin 1
I
OUT
= 100µA
I
OUT
= 100µA
I
OUT
= 50mA,
Note 7
I
OUT
= 100mA
I
OUT
= 150mA
Ground Current in Shutdown
Short Circuit Current
Reverse Leakage
V
EN
≤
0.2V, V
IN
= 6V, V
BIAS
= 6V
V
EN
= 0V, V
IN
= 6V, V
BIAS
= 6V
V
OUT
= 0V
V
IN
= 0V, V
EN
= 0V, V
OUT
= nom V
OUT
Min
–1.5
–2
0.25
0.04
0.7
50
230
270
310
23
7
0.35
1
2
1.5
0.5
350
5
500
2.5
5
20
450
500
300
400
Typ
Max
+1.5
+2
0.5
4
1
Units
%
%
%
%
%
mV
mV
mV
mV
mV
mV
µA
µA
mA
mA
mA
µA
µA
mA
µA
November 2008
3
M9999-111209
Micrel, Inc.
MIC5238
Electrical Characteristics
(4)
cont.
T
A
= 25°C with V
IN
= V
OUT
+ 1V; V
BIAS
= 3.3V; I
OUT
= 100µA; V
EN
= 2V,
bold
values indicate –40°C < T
J
< +125°C, unless
specified.
Parameter
Enable Input
Input Low Voltage
Input High Voltage
Enable Input Current
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. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
5. Line regulation measures a change in output voltage due to a change in the bias voltage.
6. Current measured from bias input to ground.
7. Current differential between output current and main input current at rated load current.
Condition
Regulator OFF
Regulator ON
V
EN
= 0.2V, Regulator OFF
V
EN
= 0.2V, Regulator ON
Min
Typ
Max
0.2
Units
V
V
µA
µA
2.0
–1.0
0.01
0.1
1.0
1.0
November 2008
4
M9999-111209
微控制器 MCU
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