MIC5225
Ultra-Low Quiescent Current
150mA µCap Low Dropout Regulator
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 2008 M9999-072908-A
General Description
The MIC5225 is a 150mA 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 MIC5225 ideal for a wide variety of
applications including USB and portable electronics
applications, using 1-cell, 2-cell or 3-cell Li-Ion battery
inputs.
A µCap LDO design, the MIC5225 is stable with either a
ceramic or tantalum output capacitor. It only requires a
2.2µF capacitor for stability.
Features of the MIC5225 includes enable input, thermal
shutdown, current limit, reverse battery protection, and
reverse leakage protection.
Available in fixed and adjustable output voltage versions,
the MIC5225 is offered in the IttyBitty® SOT23-5 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 16V
High output accuracy of ±2.0% over temperature
Guaranteed 150mA output
Very low ground current: 29µA
Low dropout voltage of 310mV at 150mA
µCap: Stable with ceramic or tantalum capacitors
Excellent line and load regulation specifications
Reverse battery protection
Reverse leakage protection
Zero shutdown current
Thermal shutdown and current limit protection
IttyBitty® SOT23-5 Package
Applications
Cellular phones
Keep alive supply in notebook and portable computers
Battery-powered equipment
Consumer/personal electronics
High-efficiency linear power supplies
Automotive electronics
_______________________________________________________________________________________________________
Typical Application
15
2
34 COUT = 2.2µF
ceramic
IGND = 18µA
CIN = 1.0µF
EN
MIC5225YM5
VIN VOUT = 1.8V
R1
R2
OFF ON
Ultra-Low Current Adjustable Regulator Application 20
22
24
26
28
30
32
34
36
38
40
4 6 8 10 12 14 16
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
IOUT = 10µA
IOUT = 1mA
IOUT = 100µA
Micrel, Inc. MIC5225
July 2008 2 M9999-072908-A
Ordering Information
Part Number Marking* Voltage** Junction Temp. Range Package Lead Finish
MIC5225-1.5YM5 QT15 1.5V –40° to +125°C 5-Pin SOT23 Pb-Free
MIC5225-1.8YM5 QT18 1.8V –40° to +125°C 5-Pin SOT23 Pb-Free
MIC5225-2.5YM5 QT25 2.5V –40° to +125°C 5-Pin SOT23 Pb-Free
MIC5225-2.7YM5 QT27 2.7V –40° to +125°C 5-Pin SOT23 Pb-Free
MIC5225-3.0YM5 QT30 3.0V –40° to +125°C 5-Pin SOT23 Pb-Free
MIC5225-3.3YM5 QT33 3.3V –40° to +125°C 5-Pin SOT23 Pb-Free
MIC5225-5.0YM5 QT50 5.0V –40° to +125°C 5-Pin SOT23 Pb-Free
MIC5225YM5 QTAA Adj. –40° to +125°C 5-Pin SOT23 Pb-Free
* Under bar symbol ( _ ) may not be to scale.
** For other voltage options available. Contact Micrel Marketing for details.
Pin Configuration
IN
OUT
NC/ADJ
EN
13
45
2
GND
5-Pin SOT23 (M5)
Pin Description
Pin Number Pin Name Pin Function
1 IN Supply Input.
2 GND Ground.
3 EN Enable (Input): Logic Low or Open = Shutdown; Logic High = Enable.
NC (Fixed) No Connect.
4 ADJ (Adjust) Adjust (Input): Feedback input. Connect to resistive voltage-divider network.
5 OUT Regulator Output.
Micrel, Inc. MIC5225
July 2008 3 M9999-072908-A
Absolute Maximum Ratings(1)
Supply Voltage (VIN).................................. ……–20V to 18V
Enable Voltage (VEN)....................................... –0.3V to 18V
Power Dissipation (PD)..............................Internally Limited
Junction Temperature (TJ) ........................–40°C to +125°C
Storage Temperature (Ts) .........................–65°C to +150°C
ESD ........................................................................... Note 3
Operating Ratings(2)
Supply Voltage (VIN).......................................... 2.3V to 16V
Enable Voltage (VEN)............................................ 0V to 16V
Junction Temperature (TJ) ........................–40°C to +125°C
Package Thermal Resistance
SOT23-5 (θJA) ..................................................235°C/W
Electrical Characteristics(4)
TA = 25°C with VIN = VOUT + 1V; Load = 100µA; bold values indicate –40°C< TJ < +125°C, unless otherwise specified.
Parameter Condition Min Typ Max Units
–1.0 +1.0 % Output Voltage Accuracy Variation from nominal VOUT
–2.0 +2.0 %
Line Regulation VIN = VOUT + 1V to 16V 0.04 %
Load Regulation Load = 100µA to 150mA 0.25 1 %
Load = 100µA 50 mV
Load = 50mA 230 300 mV
Dropout Voltage
Load = 150mA 310 450 mV
Reference Voltage 1.22 1.24 1.26
Load = 100µA 29 50 µA
Load = 50mA 0.5 0.9 mA
Ground Current
Load = 150mA 3 5 mA
Ground Current in Shutdown VEN < 0.6V; VIN = 16V 0.1 5 µA
Short Circuit Current VOUT = 0V 300 500 mA
Output Leakage,
Reverse Polarity Input
Load = 500; VIN = -15V –0.1 µA
Enable Input
Input Low Voltage Regulator OFF 0.6 V
Input High Voltage Regulator ON 2.0 V
VEN = 0.6V; Regulator OFF –1.0 0.01 +1.0 µA
VEN = 2.0V; Regulator ON 0.15 1.0 µA
Enable Input Current
VEN = 16V; Regulator ON 0.5 2.5 µA
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.
Micrel, Inc. MIC5225
July 2008 4 M9999-072908-A
Typical Characteristics
0
10
20
30
40
50
60
70
0.01 0.1 1 10 100 1000
FREQUENCY (Hz)
Power Supply
Rejection Ratio
ILOAD = 150mA
0
50
100
150
200
250
300
350
Dropout Voltage
vs. Output Current
0 20 60 80 100 120 160
OUTPUT CURRENT (mA)
40 140
0
50
100
150
200
250
300
350
400
450
500
Dropout Voltage
vs. Temperature
-40 -20 20 40 60 80
TEMPERATURE (°C)
0 100 120
IOUT = 150mA
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
INPUT VOLTAGE (V)
Output Voltage
vs. Input Voltage
ILOAD = 100µA
ILOAD = 150mA
ILOAD = 75mA
0
500
1000
1500
2000
2500
3000
Ground Pin Current
vs. Output Current
0 20 60 80 100 120 160
OUTPUT CURRENT (mA)
40 140
VIN = 4V
20
22
24
26
28
30
32
34
36
38
40
0 100 200 300 400 500
OUTPUT CURRENT (µA)
Ground Pin Current
vs. Output Current
VIN = 4V
VIN = 12V
40
45
50
55
60
65
70
75
80
Ground Pin Current
vs. Temperature
-40 -20 20 40 60 80
TEMPERATURE (°C)
0 100 120
IOUT = 10mA
500
520
540
560
580
600
620
640
660
680
700
Ground Pin Current
vs. Temperature
-40 -20 20 40 60 80
TEMPERATURE (°C)
0 100 120
IOUT = 75mA
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
Ground Pin Current
vs. Temperature
-40 -20 20 40 60 80
TEMPERATURE (°C)
0 100 120
IOUT = 150mA
0
10
20
30
40
50
60
70
80
90
100
1.5 2.0 2.5 3.0 3.5 4.0
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
IOUT = 10mA
IOUT = 10µA
IOUT = 1mA
IOUT = 100µA
0.4
0.9
1.4
1.9
2.4
2.9
3.4
1.5 2.0 2.5 3.0 3.5 4.0
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
IOUT = 75mA
IOUT = 150mA
20
22
24
26
28
30
32
34
36
38
40
4 6 8 10 12 14 16
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
IOUT = 10µA
IOUT = 1mA
IOUT = 100µA
Micrel, Inc. MIC5225
July 2008 5 M9999-072908-A
Typical Characteristics (continued)
0
20
40
60
80
100
120
010
INPUT VOLTAGE (V)
Input Current
vs. Input Voltage
VEN = 5V
RLOAD
2.95
2.96
2.97
2.98
2.99
3.00
3.01
3.02
3.03
3.04
3.05
Output Voltage
vs. Temperature
-40 -20 20 40 60 80
TEMPERATURE (°C)
0 100 120
IOUT = 100µA
0
50
100
150
200
250
300
350
400
Short Circuit Current
vs. Temperature
-40 -20 20 40 60 80
TEMPERATURE (°C)
0 100 120
VIN = 4V
0
5
10
15
20
25
30
02468101214
REVERSE CURRENT (µA)
EXTERNAL VOLTAGE (V)
Reverse Current
(Open Input)
+85°C
+25°C
-40°C
0
5
10
15
20
25
30
02468101214
REVERSE CURRENT (µA)
EXTERNAL VOLTAGE (V)
Reverse Current
(Grounded Input)
+85°C
+25°C
-40°C
IN
MIC5225
OUT
GND
Reverse
Current
EN
IN
MIC5225
OUT
GND
Reverse
Current
EN
Micrel, Inc. MIC5225
July 2008 6 M9999-072908-A
Functional Diagram
IN
EN
OUT
GND
ENABLE
VREF
1.24V
Block Diagram – Fixed Output Voltage
IN
EN
R1
R2
ADJ
OUT
GND
ENABLE
VREF
1.24V
Block Diagram – Adjustable Output Voltage
Micrel, Inc. MIC5225
July 2008 7 M9999-072908-A
Application Information
Enable/Shutdown
The MIC5225 comes with an active-high enable pin that
allows the regulator to be disabled. Forcing the enable
pin lows disables the regulator and sends it into a “zero
off-mode current state. In this state, current consumed
by the regulator goes nearly to zero. Forcing the enable
pin high enables the output voltage.
Input Capacitor
The MIC5225 has a wide input voltage capability up to
16V. The input capacitor must be rated to sustain
voltages that may be used on the input. An input
capacitor may be required when the device is not near
the source power supply or when supplied by a battery.
Small, surface mount, ceramic capacitors can be used
for bypassing. Larger value may be required if the
source supply has high ripple.
Output Capacitor
The MIC5225 requires an output capacitor for stability.
The design requires 1.0µF or greater on the output to
maintain stability. The design is optimized for use with
low-ESR ceramic chip capacitors. High ESR capacitors
may cause high frequency oscillation. The maximum
recommended ESR is 300m. The output capacitor can
be increased, but performance has been optimized for a
1.0µF ceramic output capacitor and does not improve
significantly with the use of a larger capacitor.
X7R/X5R dielectric-type ceramic capacitors are
recommended because of their temperature
performance. X7R-type capacitors change capacitance
by 15% over their operating temperature range and are
the most stable type of ceramic capacitors. Z5U and
Y5V dielectric capacitors change value by as much as
50% and 60% respectively over their operating
temperature ranges. To use a ceramic chip capacitor
with Y5V dielectric, the value must be much higher than
an X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
No-Load Stability
The MIC5225 will remain stable and in regulation with no
load unlike many other voltage regulators. This is
especially important in CMOS RAM keep-alive
applications.
Thermal Consideration
The MIC5225 is designed to provide 150mA of
continuous current in a very small package. Maximum
power dissipation can be calculated based on the output
current and the voltage drop across the part. To
determine the maximum power dissipation of the
package, use the junction-to-ambient thermal resistance
of the device and the following basic equation:
P
D(MAX) = (TJ(MAX) – TA)/θJA
TJ(MAX) is the maximum junction temperature of the die,
125°C, and TA is the ambient operating temperature. θJA
is layout dependent; Table 1 shows examples of the
junction-to-ambient thermal resistance for the MIC5225.
Package θJA Recommended
Minimum Footprint
SOT-23-5 235oC/W
Table 1. SOT-23-5 Thermal Resistance
The actual power dissipation of the regulator circuit can
be determined using the equation:
P
D = (VIN – VOUT)IOUT + VINIGND
Substituting PD(MAX for PD and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5225-3.0BMM at
50°C with a minimum footprint layout, the maximum input
voltage for a set output current can be determined as
follows:
P
D(MAX) = (125oC – 50oC)/ 235oC/W
P
D(MAX) = 319mW
The junction-to-ambient thermal resistance for the
minimum footprint is 235°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using the output voltage of 3.0V, and
an output current of 150mA, the maximum input voltage
can be determined.
319mW = (VIN – 3.0V)150mA + VIN × 3.0mA
319mW = VIN × 153mA – 450mW
769mW = VIN × 153mA
V
IN(MAX) = 5.02V
Therefore, a 3.0V application at 150mA of output current
can accept a maximum input voltage of 5.02V in the
SOT-23-5 package. For a full discussion of heat sinking
and thermal effects on the voltage regulators, refer to the
Regulator Thermals section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook:
http://www.onfulfillment.com/estore/pdf_download.asp?
s=2243381&p=18&pdf=842935-iecjdf-bicadii
Micrel, Inc. MIC5225
July 2008 8 M9999-072908-A
Adjustable Regulator Application
The MIC5225YM5 can be adjusted from 1.24V to 14V by
using two external resistors (Figure 1). The resistors set
the output voltage based on the following equation:
V
OUT = VREF(1 + (R1/R2)),
Where VREF = 1.24V.
Feedback resistor R2 should be no larger than 300k.
OUT
ADJ.
VIN
R1
R2
2.0µF
1.0µF EN
IN
VOUT
GND
MIC5225YM5
Figure 1. Adjustable Voltage Application
Micrel, Inc. MIC5225
July 2008 9 M9999-072908-A
Package Information
5-Pin SOT23 (M5)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2007 Micrel, Incorporated.