MIC5295YD [MICREL]
Low Quiescent Current, 150mA LDO Regulator; 低静态电流器，150mA LDO稳压器
| 型号： | MIC5295YD |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Low Quiescent Current, 150mA LDO Regulator |
| 文件： | 总11页 (文件大小：274K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5295
Low Quiescent Current, 150mA LDO
Regulator
General Description
Features
The MIC5295 is a 150mA highly accurate, low dropout
regulator with high input voltage and low ground current.
This combination of high voltage and low ground current
makes the MIC5295 ideal for USB and portable electronics
applications, using 1-cell, 2-cell or 3-cell Li-Ion battery
inputs.
• Wide input voltage range: 2.3V to 24V
• Ultra low ground current: 18µA
• Low dropout voltage: 300mV at 150mA
• High initial output accuracy: ±1.0%
• Stable with ceramic or tantalum capacitors
• Excellent line and load regulation specifications
• Reverse battery protection
A µCap LDO design, the MIC5295 is stable with either a
ceramic or tantalum output capacitor. It only requires a
2.2µF capacitor for stability.
• Reverse leakage protection
Features of the MIC5295 includes enable input, thermal
shutdown, current limit, reverse battery protection, and
reverse leakage protection.
• Thermal shutdown and current limit protection
• PowerTO-252-5 (D-Pak)package
• Adjustable output from 1.24V-20V
Available in fixed and adjustable output voltage versions,
the MIC5295 is offered in the TO-252-5 (D-Pak) package
with a junction temperature range of –40°C to +125°C.
Applications
• USB power supply
• Cellular phones
• Keep-alive supply in notebook and portable computers
• Logic supply for high-voltage batteries
• Automotive electronics
• Battery powered systems
Typical Application
Ground Current
vs. Input Voltage
100
90
80
70
60
10mA
50
40
100µA
30
20
10
0
4
8
12
16
20
24
INPUT VOLTAGE (V)
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
M9999-110209-A
November 2009
Micrel, Inc.
MIC5295
Ordering Information
Part Number
MIC5295-3.0YD
MIC5295-3.3YD
MIC5295-5.0YD
MIC5295YD
Marking Code
5295-30Y
5295-33Y
5295-50Y
5295YD
Voltage
3.0V
3.3V
5.0V
Adj
Junction Temp. Range
–40° to +125°C
Package
5-Pin TO-252
5-Pin TO-252
5-Pin TO-252
5-Pin TO-252
–40° to +125°C
–40° to +125°C
–40° to +125°C
Pin Configuration
5-Pin TO-252
Pin Description
Pin Number
Pin Name
Pin Function
1
2
3
4
5
EN
VIN
Enable (Input): Logic low = shutdown; logic high = enable. Do not leave floating.
Supply Input.
GND
Ground.
VOUT
NC(fixed)
ADJ(adj)
Regulator Output.
No Connect.
Adjust (Input): Feedback input. Connect to resistive Voltage-divider network.
M9999-110209-A
November 2009
2
Micrel, Inc.
MIC5295
Absolute Maximum Ratings(1)
Operating Ratings(2)
Input Supply Voltage........................................ –20V to 38V
Enable Input Voltage....................................... –0.3V to 38V
Power Dissipation .....................................Internally Limited
Junction Temperature ...............................–40°C to +125°C
Storage Temperature................................–65°C to +150°C
ESD Rating(3)................................................. ESD Sensitive
Input Supply Voltage......................................... 2.3V to 24V
Enable Input Voltage............................................ 0V to 24V
Junction Thermal.......................................–40°C to +125°C
Package Thermal Resistance
TO-252-5 (θJA) ...................................................50°C/W
Electrical Characteristics(4)
VIN = VOUT + 1V; IOUT = 100µA; CIN =1.0μF, COUT = 2.2μA; TJ = 25°C, bold values indicate –40°C<TJ<+125°C; unless
otherwise specified.
Parameter
Condition
Min
Typ
Max
Units
Output Voltage Accuracy
Variation from nominal VOUT
–1.0
–2.0
+1.0
+2.0
%
%
Line Regulation
Load Regulation
Dropout Voltage
VIN = VOUT + 1V to 24V
Load = 100µA to 150mA
IOUT = 100µA
0.04
0.25
45
%
%
1
mV
mV
mV
mV
V
IOUT = 50mA
220
260
300
1.24
400
450
500
IOUT = 100mA
IOUT = 150mA
Reference Voltage
Ground Current
-1.0
+1.0
%
I
OUT = 100µA
18
30
35
0.7
2
µA
µA
mA
mA
mA
IOUT = 50mA
OUT = 100mA
0.35
1
2
I
IOUT = 150mA
4
Ground Current in Shutdown
Current Limit
VEN = 0V; VIN = 24V
VOUT = 0V
0.1
350
50
1
µA
mA
500
Ripple Rejection
f =1kHz
dB
Output Voltage Noise
10Hz to 100kHz
Load = 500Ω; VIN = –15V; VEN =0.4V
47
µVRMS
µA
Output Leakage,
–0.1
Reverse Polarity Input
Enable Input
Enable turn on time
Input Low Voltage
Input High Voltage
Enable Input Current
1.2
10
ms
V
Regulator OFF
Regulator ON
0.4
2.0
V
VEN = 0.6V; Regulator OFF
VEN = 2.0V; Regulator ON
VEN = 24V; Regulator ON
–1.0
0.01
0.1
0.5
1.0
1.0
2.5
µA
µA
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, 1.5kꢀ in series with 100pF.
4. Specification for packaged product only.
M9999-110209-A
November 2009
3
Micrel, Inc.
MIC5295
Typical Characteristics
Dropout Voltage
vs. Output Current
Dropout Voltage
vs. Temperature
PSRR
350
300
250
200
150
100
50
-100
450
400
350
300
250
200
150
100
50
VIN = 10V
OUT = 2.5V
COUT = 2.2µF
-90
V
150mA
-80
-70
-60
-50
-40
-30
-20
-10
0
150mA
50mA
100mA
100µA
1K
VOUT = 2.5V
COUT = 2.2µF
VOUT = 2.5V
COUT = 2.2µF
0
0
10
100
10K
100K
1M
10M
0
25
50
75
100
125
150
-40 -20
0
20
40 60 80 100 120
1.E+0 1.E+0 1.E+0 1.E+0 1.E+0 1.E+0 1.E+0
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
1
2
3
4
5
6
7
FREQUENCY (Hz)
Ground Current
vs. Input Voltage
Ground Current
vs. Input Voltage
Ground Current
vs. Input Voltage
2.5
2.0
1.5
1.0
0.5
0.0
2.5
2.0
1.5
1.0
0.5
0.0
90
80
70
60
50
40
30
20
10
0
VOUT = 3V
COUT = 2.2µF
150mA
150mA
VOUT = 1.36V
COUT = 2.2µF
10mA
100mA
100mA
100µA
50mA
50mA
VOUT = 1.36V
COUT = 2.2µF
2.3 2.8 3.3
3.8 4.3 4.8
5.3 5.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
5.8
4
8
12
16
20
24
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Ground Current
vs. Input Voltage
Ground Current
vs. Output Current
Ground Current
vs. Temperature
100
90
80
70
60
50
40
30
20
10
0
2.50
3.0
2.5
2.0
1.5
1.0
0.5
0.0
VOUT = 3V
COUT = 2.2µF
VOUT = 3V
COUT = 2.2µF
150mA
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
VIN = 12V
VOUT = 3V
COUT = 2.2µF
10mA
100mA
VIN = 4V
100µA
50mA
VIN = 24V
0
25
50
75
100
125
150
-40 -20
0
20 40
60 80 100 120
4
8
12
16
20
24
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Input Voltage
Current limit
vs. Input Voltage
MIC5295 - Output Noise
Spectral Density
10
1
3.2
3.1
3.0
2.9
2.8
500
450
400
350
300
250
200
COUT = 2.2µF
100µA
0.1
75mA
0.01
150mA
20
VIN = 4.5V
VOUT = 3V
COUT = 2.2µF
0.001
10
100
1K
10K
100K
1M
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
0
5
10
15
25
0
5
10
15
20
25
30
35
40
FREQUENCY (Hz)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
M9999-110209-A
November 2009
4
Micrel, Inc.
MIC5295
Typical Characteristics (continued)
Reverse Current
(Open Input)
Reverse Current
(VIN Grounded)
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
-40°C
125°C
125°C
-40°C
25°C
25°C
0
5
10
15
20
0
5
10
15
20
EXTERNAL VOLTAGE (V)
EXTERNAL VOLTAGE (V)
M9999-110209-A
November 2009
5
Micrel, Inc.
MIC5295
Functional Characteristics
M9999-110209-A
November 2009
6
Micrel, Inc.
MIC5295
Functional Diagram
Block Diagram – Fixed Output Voltage
Block Diagram – Adjustable Output Voltage
M9999-110209-A
November 2009
7
Micrel, Inc.
MIC5295
part. For example, given that the input voltage of 3.3V
the output voltage is 2.3V and the output current =
150mA. The actual power dissipation of the regulator
circuit can be determined using the equation:
Application Information
Enable/Shutdown
The MIC5295 comes with an active-high enable pin that
allows the regulator to be disabled. Forcing the enable
pin low 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. Do not leave this pin
floating as the output will be in indeterminate state.
PD = (VIN – VOUT)IOUT + VIN × IGND
Due to the potential for input voltages up to 24V, ground
current must be taken into consideration.
PD(MAX) = (3.3 – 2.3V)150mA + 3.3x 1.2mA
PD(MAX) = 0.154W
The junction-to-ambient thermal resistance for the
MIC5295, D-Pak is 50°C/W.To determine the maximum
ambient operating temperature of the package, use the
junction-to-ambient thermal resistance of the device and
the following basic equation:
Input Capacitor
The MIC5295 has high input voltage capability up to
24V. 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 values may be required if the
source supply has high ripple.
T
− TA
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
J(MAX)
PD(MAX)
=
θJA
TJ(MAX) is the maximum junction temperature of the die,
125°C, the maximum ambient temperature can be
calculated to be 117.3°C as shown below:
Output Capacitor
The MIC5295 requires an output capacitor for stability.
The design requires 2.2µF 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 3ꢀ. The output capacitor can be
increased without limit. Larger valued capacitors help to
improve transient response.
125°C − T
50°C/W
⎛
⎜
⎞
⎟
A
0.154W =
⎝
⎠
TA = 117.3°C
Adjustable Regulator Application
The MIC5295YD can be adjusted from 1.24V to 20V by
using two external resistors (Figure 1). The resistors set
the output voltage based on the following equation:
X7R/X5R dielectric-type ceramic capacitors are
recommended
because
of
their
temperature
⎛
⎜
⎝
⎞
⎟
⎟
⎠
⎛
⎞
R1
R2
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
a X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
⎜
⎜
⎜
⎟
⎟
VOUT = VREF 1+
⎝
⎠
Where VREF = 1.24V.
Feedback resistor R2 should be no larger than 300kꢀ.
No-Load Stability
The MIC5295 will remain stable with no load unlike
many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
Figure 1. Adjustable Voltage Application
Thermal Considerations
The MIC5295 is designed to provide 150mA of
continuous current in a small package. Maximum
ambient operating temperature can be calculated based
on the output current and the voltage drop across the
M9999-110209-A
November 2009
8
Micrel, Inc.
MIC5295
Evaluation Board Schematic
Bill of Materials
Item
C1
Part Number
UMK325BJ105KM-T
TMK212BJ225KG-T
CRCW06033003FKEYE3
CRCW06031003FKEYE2
MIC5295YD
Manufacturer
Taiyo Yuden(1)
Taiyo Yuden
Vishay Dale(2)
Vishay Dale
Description
Qty.
Capacitor, 1µF, 50V, X5R, Size 1210
Capacitor, 2.2µF, 25V, X5R, Size 0805
Resistor, 300k, 1%. 1/16W, Size 0603
Resistor, 100k, 1%. 1/16W, Size 0603
Low Quiescent Current, 150mA LDO Regulator
1
1
1
1
1
C2
R1
R2
U1
Micrel, Inc.(3)
Notes:
1. Murata: www.t-yuden.com
2. Vishay: www.vishay.com.
3. Micrel, Inc.: www.micrel.com.
M9999-110209-A
November 2009
9
Micrel, Inc.
MIC5295
PCB Layout Recommendations
Top Layer
Bottom Layer
M9999-110209-A
November 2009
10
Micrel, Inc.
MIC5295
Package Information
5-Pin TO-252
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.
© 2009 Micrel, Incorporated.
M9999-110209-A
November 2009
11
相关型号：
©2020 ICPDF网 联系我们和版权申明