MIC5225-2.5YM5 [ROCHESTER]
2.5 V FIXED POSITIVE LDO REGULATOR, 0.45 V DROPOUT, PDSO5, LEAD FREE, SOT-23, 5 PIN;
| 型号： | MIC5225-2.5YM5 |
| 厂家： | 
Rochester Electronics |
| 描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.45 V DROPOUT, PDSO5, LEAD FREE, SOT-23, 5 PIN 光电二极管 输出元件 调节器 |
| 文件： | 总10页 (文件大小：898K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5225
Ultra-Low Quiescent Current
150mA µCap Low Dropout Regulator
General Description
Features
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.
• 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
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.
• Thermal shutdown and current limit protection
• IttyBitty® SOT23-5 Package
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.
Applications
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
• 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
Ground Pin Current
vs. Input Voltage
MIC5225YM5
40
38
36
34
32
30
28
26
24
22
20
VIN
VOUT = 1.8V
1
5
2
I
= 1mA
R1
R2
OUT
CIN = 1.0µF
OFF
COUT = 2.2µF
ceramic
3
4
I
= 100µA
OUT
ON
EN
IGND = 18µA
I
= 10µA
OUT
8
4
6
10 12 14 16
Ultra-Low Current Adjustable Regulator Application
INPUT VOLTAGE (V)
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
M9999-072908-A
July 2008
Micrel, Inc.
MIC5225
Ordering Information
Part Number
MIC5225-1.5YM5
MIC5225-1.8YM5
MIC5225-2.5YM5
MIC5225-2.7YM5
MIC5225-3.0YM5
MIC5225-3.3YM5
MIC5225-5.0YM5
MIC5225YM5
Marking*
QT15
QT18
QT25
QT27
QT30
QT33
QT50
QTAA
Voltage**
1.5V
Junction Temp. Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
1.8V
2.5V
2.7V
3.0V
3.3V
5.0V
Adj.
* Under bar symbol ( _ ) may not be to scale.
** For other voltage options available. Contact Micrel Marketing for details.
Pin Configuration
EN GND IN
3
2
1
4
5
NC/ADJ
OUT
5-Pin SOT23 (M5)
Pin Description
Pin Number
Pin Name
IN
Pin Function
Supply Input.
Ground.
1
2
3
GND
EN
Enable (Input): Logic Low or Open = Shutdown; Logic High = Enable.
NC (Fixed)
ADJ (Adjust)
OUT
No Connect.
4
5
Adjust (Input): Feedback input. Connect to resistive voltage-divider network.
Regulator Output.
M9999-072908-A
July 2008
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Micrel, Inc.
MIC5225
Absolute Maximum Ratings(1)
Operating Ratings(2)
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
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
–1.0
–2.0
Typ
Max
+1.0
+2.0
Units
%
Output Voltage Accuracy
Variation from nominal VOUT
%
Line Regulation
Load Regulation
VIN = VOUT + 1V to 16V
Load = 100µA to 150mA
Load = 100µA
0.04
0.25
50
%
1
%
mV
mV
mV
Dropout Voltage
Reference Voltage
Ground Current
Load = 50mA
230
310
1.24
29
300
450
1.26
50
Load = 150mA
1.22
Load = 100µA
µA
mA
mA
µA
Load = 50mA
0.5
0.9
5
Load = 150mA
3
Ground Current in Shutdown
Short Circuit Current
Output Leakage,
VEN < 0.6V; VIN = 16V
VOUT = 0V
0.1
5
300
–0.1
500
mA
µA
Load = 500Ω; VIN = -15V
Reverse Polarity Input
Enable Input
Input Low Voltage
Regulator OFF
0.6
V
Input High Voltage
Enable Input Current
Regulator ON
2.0
V
VEN = 0.6V; Regulator OFF
VEN = 2.0V; Regulator ON
–1.0
0.01
0.15
0.5
+1.0
1.0
µA
µA
µA
VEN = 16V; Regulator ON
2.5
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, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
M9999-072908-A
July 2008
3
Micrel, Inc.
MIC5225
Typical Characteristics
Power Supply
Rejection Ratio
Dropout Voltage
vs. Output Current
Dropout Voltage
vs. Temperature
70
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
60
50
40
30
20
10
I
= 150mA
OUT
I
= 150mA
LOAD
0
0
0
-40 -20
0
20 40 60 80 100120
0.01 0.1
1
10
100 1000
0
20 40 60 80 100 120 140160
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
FREQUENCY (Hz)
Output Voltage
vs. Input Voltage
Ground Pin Current
vs. Output Current
Ground Pin Current
vs. Output Current
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3000
2500
2000
1500
1000
500
40
38
36
34
32
30
28
26
24
22
20
I
= 100µA
LOAD
I
= 75mA
LOAD
V
= 12V
IN
V
IN
= 4V
I
= 150mA
LOAD
V
= 4V
IN
0
0
100 200 300 400 500
OUTPUT CURRENT (µA)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
INPUT VOLTAGE (V)
0
20 40 60 80 100 120 140160
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Temperature
Ground Pin Current
vs. Temperature
Ground Pin Current
vs. Temperature
80
75
70
65
60
55
50
45
40
700
680
660
640
620
600
580
560
540
520
500
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
I
= 150mA
I
= 75mA
I
= 10mA
OUT
OUT
OUT
-40 -20
0
20 40 60 80 100120
-40 -20
0
20 40 60 80 100120
-40 -20
0
20 40 60 80 100120
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
Ground Pin Current
vs. Input Voltage
Ground Pin Current
vs. Input Voltage
Ground Pin Current
vs. Input Voltage
100
90
80
70
60
50
40
30
20
10
0
3.4
2.9
2.4
1.9
1.4
0.9
0.4
40
38
36
34
32
30
28
26
24
22
20
I
= 10mA
OUT
I
= 150mA
OUT
I
= 1mA
OUT
I
= 100µA
OUT
I
= 1mA
OUT
I
= 100µA
OUT
I
= 10µA
OUT
8
I
= 75mA
OUT
I
= 10µA
2.5
OUT
4
6
10 12 14 16
1.5
2.0
3.0
3.5
4.0
1.5
2.0
2.5
3.0
3.5
4.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
M9999-072908-A
July 2008
4
Micrel, Inc.
MIC5225
Typical Characteristics (continued)
Input Current
vs. Input Voltage
Output Voltage
vs. Temperature
Short Circuit Current
vs. Temperature
120
100
80
60
40
20
0
3.05
400
350
300
250
200
150
100
50
3.04
3.03
3.02
3.01
3.00
2.99
2.98
2.97
2.96
2.95
V
R
= 5V
EN
LOAD
I
= 100µA
OUT
V
= 4V
IN
0
-40 -20
0
20 40 60 80 100120
0
10
-40 -20
0
20 40 60 80 100120
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Reverse Current
(Open Input)
Reverse Current
(Grounded Input)
30
25
20
15
10
5
30
25
20
15
10
5
-40°C
-40°C
+25°C
+25°C
+85°C
+85°C
0
0
0
2
4
6
8
10 12 14
0
2
4
6
8
10 12 14
EXTERNAL VOLTAGE (V)
EXTERNAL VOLTAGE (V)
MIC5225
MIC5225 Reverse
Reverse
Current
Current
IN
OUT
OUT
IN
EN
EN
GND
GND
M9999-072908-A
July 2008
5
Micrel, Inc.
MIC5225
Functional Diagram
OUT
IN
EN
ENABLE
1.24V
VREF
GND
Block Diagram – Fixed Output Voltage
OUT
IN
EN
ENABLE
R1
1.24V
VREF
ADJ
R2
GND
Block Diagram – Adjustable Output Voltage
M9999-072908-A
July 2008
6
Micrel, Inc.
MIC5225
Thermal Consideration
Application Information
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:
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.
PD(MAX) = (TJ(MAX) – TA)/θJA
Input Capacitor
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.
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.
Package
θ
JA Recommended
Minimum Footprint
SOT-23-5
235oC/W
Table 1. SOT-23-5 Thermal Resistance
Output Capacitor
The actual power dissipation of the regulator circuit can
be determined using the equation:
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 300mΩ. 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.
PD = (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:
X7R/X5R dielectric-type ceramic capacitors are
P
P
D(MAX) = (125oC – 50oC)/ 235oC/W
D(MAX) = 319mW
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.
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
No-Load Stability
VIN(MAX) = 5.02V
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.
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
M9999-072908-A
July 2008
7
Micrel, Inc.
MIC5225
MIC5225YM5
Adjustable Regulator Application
VIN
VOUT
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:
IN
OUT
R1
R2
EN
ADJ.
VOUT = VREF(1 + (R1/R2)),
2.0µF
1.0µF
GND
Where VREF = 1.24V.
Feedback resistor R2 should be no larger than 300kΩ.
Figure 1. Adjustable Voltage Application
M9999-072908-A
July 2008
8
Micrel, Inc.
MIC5225
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.
M9999-072908-A
July 2008
9
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