MIC5233
High Input Voltage
Low IQ µCap LDO Regulator
General Description
The MIC5233 is a 100mA highly accurate, low dropout
regulator with high input voltage and ultra-low ground
current. This combination of high voltage and low ground
current makes the MIC5233 ideal for multi-cell Li-Ion
battery systems.
A µCap LDO design, the MIC5233 is stable with either
ceramic or tantalum output capacitor. It only requires a
2.2µF capacitor for stability.
Features of the MIC5233 include enable input, thermal-
shutdown, current-limit, reverse-battery protection, and
reverse-leakage protection.
Available in fixed and adjustable output voltage versions,
the MIC5233 is offered in the IttyBitty
®
SOT-23-5 and
SOT223-3 package with a 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
•
•
•
•
•
•
•
•
•
•
•
Wide input voltage range: 2.3V to 36V
Ultra-low ground current: 18µA
Low dropout voltage of 270mV at 100mA
High output accuracy of ±2.0% over temperature
µCap: stable with ceramic or tantalum capacitors
Excellent line and load regulation specifications
Zero shutdown current
Reverse-battery protection
Reverse-leakage protection
Thermal-shutdown and current-limit protection
IttyBitty
®
SOT-23-5 and SOT-223-3 packages
Applications
•
•
•
•
•
•
Keep-alive supply in notebook and portable computers
USB power supply
Logic supply for high-voltage batteries
Automotive electronics
Battery-powered systems
3
−
4 cell Li-Ion battery input range
_________________________________________________________________________________________________________________________
Typical Application
Ultra-Low Current Adjustable Regulator Application
Ground Current vs. Input Voltage
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
July 2012
M9999-071212-B
Micrel, Inc.
MIC5233
Absolute Maximum Ratings
(1)
Input Supply Voltage (V
IN
)..............................
−20V
to +38V
Enable Input Voltage (V
EN
)............................
−0.3V
to +38V
Power Dissipation (P
DIS
)............................Internally Limited
Junction Temperature (T
J
) ........................−40°C to +125°C
Storage Temperature (T
S
).........................−65°C to +150°C
ESD Rating
(3)
................................................. ESD Sensitive
Operating Ratings
(2)
Input Supply Voltage (V
IN
)............................. +2.3V to +36V
Enable Input Voltage (V
EN
)................................. 0V to +36V
Junction Temperature (T
J
) ........................
−40°C
to +125°C
Package Thermal Resistance
SOT-23-5 (θ
JA
) .................................................235°C/W
SOT-223 (θ
JA
) ....................................................50°C/W
Electrical Characteristics
(4)
T
J
= 25°C with V
IN
= V
OUT
+ 1V; I
OUT
= 100µA;
Bold
values indicate –40°C < T
J
< +125°C; unless otherwise specified.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Condition
Variation from nominal V
OUT
V
IN
= V
OUT
+ 1V to 36V
I
OUT
= 100µA to 100mA
I
OUT
= 100µA
Dropout Voltage
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 100µA
Ground Current
I
OUT
= 50mA
I
OUT
= 100mA
Ground Current in Shutdown
Short-Circuit Current
Output Leakage, Reverse Polarity Input
Enable Input (SOT-23 Package Only)
Input LOW Voltage
Input HIGH Voltage
Enable Input Current
Start-Up Time
Notes:
1.
2.
3.
4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only
Min.
−1.0
−2.0
Typ.
Max.
+1.0
+2.0
Units
%
%
%
0.04
0.25
50
230
270
18
0.25
1
0.1
190
−0.1
0.5
1
300
400
400
450
30
35
0.70
2
1
350
mV
µA
mA
µA
mA
µA
V
V
V
EN
≤
0.6V; V
IN
+ 36V (SOT-23 package only)
V
OUT
= 0V
Load = 500Ω; V
IN
=
−15V
Regulator OFF
Regulator ON
V
EN
= 0.6V; Regulator OFF
V
EN
= 2.0V; Regulator ON
V
EN
= 36V; Regulator ON
Guaranteed by design
2.0
−1.0
0.6
0.01
0.1
0.5
1.7
1.0
1.0
2.5
7
µA
ms
July 2012
3
M9999-071212-B
嵌入式系统
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