MICREL MIC5295

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.
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.
Features of the MIC5295 includes enable input, thermal
shutdown, current limit, reverse battery protection, and
reverse leakage protection.
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.
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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
Reverse leakage protection
Thermal shutdown and current limit protection
PowerTO-252-5 (D-Pak)package
Adjustable output from 1.24V-20V
Applications
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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
v s. Input Voltage
100
GROUND CURRENT (µA)
90
80
70
60
10mA
50
40
100µA
30
20
10
0
4
Low Current Adjustable Regulator Application
8
12
16
20
INPUT VOLT AGE (V)
24
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
November 2009
M9999-110209-A
Micrel, Inc.
MIC5295
Ordering Information
Part Number
Marking Code
Voltage
Junction Temp. Range
Package
MIC5295-3.0YD
5295-30Y
3.0V
–40° to +125°C
5-Pin TO-252
MIC5295-3.3YD
5295-33Y
3.3V
–40° to +125°C
5-Pin TO-252
MIC5295-5.0YD
5295-50Y
5.0V
–40° to +125°C
5-Pin TO-252
5295YD
Adj
–40° to +125°C
5-Pin TO-252
MIC5295YD
Pin Configuration
5-Pin TO-252
Pin Description
Pin Number
Pin Name
Pin Function
1
EN
Enable (Input): Logic low = shutdown; logic high = enable. Do not leave floating.
2
VIN
Supply Input.
3
GND
Ground.
4
VOUT
Regulator Output.
5
NC(fixed)
No Connect.
ADJ(adj)
Adjust (Input): Feedback input. Connect to resistive Voltage-divider network.
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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
Output Voltage Accuracy
Variation from nominal VOUT
–1.0
–2.0
Typ
Max
Units
+1.0
+2.0
%
%
Line Regulation
VIN = VOUT + 1V to 24V
0.04
Load Regulation
Load = 100µA to 150mA
0.25
Dropout Voltage
IOUT = 100µA
45
IOUT = 50mA
220
400
mV
IOUT = 100mA
260
450
mV
300
500
mV
IOUT = 150mA
Reference Voltage
%
1
mV
1.24
-1.0
%
V
+1.0
%
µA
µA
mA
mA
mA
IOUT = 100µA
18
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
0.35
1
2
30
35
0.7
2
4
VEN = 0V; VIN = 24V
0.1
1
µA
Current Limit
VOUT = 0V
350
500
mA
Ripple Rejection
f =1kHz
50
dB
Output Voltage Noise
10Hz to 100kHz
47
µVRMS
Output Leakage,
Reverse Polarity Input
Load = 500Ω; VIN = –15V; VEN =0.4V
–0.1
µA
Ground Current
Ground Current in Shutdown
Enable Input
Enable turn on time
1.2
Input Low Voltage
Regulator OFF
Input High Voltage
Regulator ON
2.0
Enable Input Current
VEN = 0.6V; Regulator OFF
VEN = 2.0V; Regulator ON
VEN = 24V; Regulator ON
–1.0
10
ms
0.4
V
V
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, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
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MIC5295
Typical Characteristics
Dropout Voltage
v s. Output Current
PSRR
-80
DRO POUT VOLTAG E (mV)
VIN = 10V
VOUT = 2.5V
COUT = 2.2µF
-90
-70
150mA
-50
-40
-30
-20
100µA
-10
450
300
400
250
200
150
100
50
VOUT = 2.5V
COUT = 2.2µF
200
25
50
75
100
125
OUT PUT CURRENT (mA)
150
-40 -20
2.5
10mA
50
40
100µA
30
20
VOUT = 1.36V
COUT = 2.2µF
10
0.0
3.3 3.8 4.3 4.8 5.3
INPUT VOLT AGE (V)
5.8
100mA
1.0
50mA
0.5
0.0
2.3
2.8
3.3 3.8 4.3 4.8 5.3
INPUT VO LT AGE (V)
5.8
4
100
2.50
VOUT = 3V
COUT = 2.2µF
150mA
VIN = 12V
GROUND CURRENT (mA)
1.75
1.50
10mA
VIN = 4V
1.25
50
1.00
40
100µA
30
0.75
0.50
20
VIN = 24V
0.25
10
0.00
0
4
8
12
16
20
INPUT VOLT AGE (V)
2.5
25
50
75
100
125
OUT PUT CURRENT (mA)
Output Voltage
v s. Input Voltage
1.0
50mA
0.5
150
-40
-20
0
20 40 60 80
T EM PERAT URE (°C)
100 120
MIC5295 - Output Noise
Spectral Density
10
500
COUT = 2.2µF
100mA
1.5
Current limit
v s. Input Voltage
3.2
VOUT = 3V
COUT = 2.2µF
2.0
0.0
0
24
24
3.0
2.00
70
12
16
20
INPUT VOLT AGE (V)
Ground Current
v s. Temperature
VOUT = 3V
COUT = 2.2µF
2.25
80
60
8
Ground Current
v s. Output Current
Ground Current
v s. Input Voltage
90
150mA
1.5
0
2.8
100 120
VOUT = 3V
COUT = 2.2µF
2.0
GROUND CURRENT (mA)
50mA
0.5
60
0
20 40 60 80
T EM PERAT URE (°C)
Ground Current
v s. Input Voltage
70
G RO UND CURRENT (µA)
100mA
1.0
2.3
VOUT = 2.5V
COUT = 2.2µF
50
80
2.0
VOUT = 1.36V
COUT = 2.2µF
100mA
100
90
150mA
1.5
50mA
150
Ground Current
v s. Input Voltage
2.5
GROUND CURRENT (mA)
250
0
0
Ground Current
v s. Input Voltage
GROUND CURRENT (µA)
300
0
0
10
100
1K
10K
100K 1.E+0
1M
10M
1.E+0
1.E+0
1.E+0
1.E+0
1.E+0
1.E+0
1
2
3
4
5
6
7
FREQ
UENCY
(Hz)
150mA
350
GROUND CURRENT (mA)
dB
-60
350
DROPOUT VO LTAGE (mV)
-100
Dropout Voltage
v s. Temperature
100µA
3.0
75mA
2.9
150mA
2.8
1
400
NOISE µV/√Hz
CURRENT LIM IT (mA)
O UTPUT VOLTAG E (V)
450
3.1
350
300
0.01
250
200
0
5
10
15
20
INPUT VO LT AG E (V)
November 2009
25
0.1
0
5
10 15
20 25 30
INPUT VO LT AGE (V)
4
35
40
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
FREQUENCY (Hz)
M9999-110209-A
Micrel, Inc.
MIC5295
Typical Characteristics (continued)
Rev erse Current
(VIN Grounded)
70
60
60
50
50
REVERSE CURRENT (µA)
REVERSE CURRENT (µA)
Rev erse Current
(Open Input)
125°C
40
-40°C
30
20
10
25°C
0
-40°C
125°C
40
30
20
25°C
10
0
0
5
10
15
EXT ERNAL VOLT AGE (V)
November 2009
20
0
5
10
15
EXT ERNAL VOLT AGE (V)
5
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Micrel, Inc.
MIC5295
Functional Characteristics
November 2009
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Micrel, Inc.
MIC5295
Functional Diagram
Block Diagram – Fixed Output Voltage
Block Diagram – Adjustable Output Voltage
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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:
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:
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.
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.
⎛ TJ(MAX) − TA
PD(MAX) = ⎜⎜
θ JA
⎝
⎞
⎟
⎟
⎠
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 3Ω. The output capacitor can be
increased without limit. Larger valued capacitors help to
improve transient response.
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
a X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
⎛ 125°C − TA ⎞
0.154W = ⎜
⎟
⎝ 50°C/W ⎠
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:
⎛ ⎛R
VOUT = VREF ⎜1 + ⎜⎜ 1
⎜
⎝ ⎝ R2
⎞⎞
⎟⎟ ⎟
⎟
⎠⎠
Where VREF = 1.24V.
Feedback resistor R2 should be no larger than 300kΩ.
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
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MIC5295
Evaluation Board Schematic
Bill of Materials
Item
Part Number
Manufacturer
Description
C1
UMK325BJ105KM-T
Taiyo Yuden(1)
Capacitor, 1µF, 50V, X5R, Size 1210
1
C2
TMK212BJ225KG-T
Taiyo Yuden
Capacitor, 2.2µF, 25V, X5R, Size 0805
1
R1
CRCW06033003FKEYE3
R2
CRCW06031003FKEYE2
U1
MIC5295YD
(2)
Vishay Dale
Vishay Dale
Micrel, Inc.
(3)
Qty.
Resistor, 300k, 1%. 1/16W, Size 0603
1
Resistor, 100k, 1%. 1/16W, Size 0603
1
Low Quiescent Current, 150mA LDO Regulator
1
Notes:
1. Murata: www.t-yuden.com
2. Vishay: www.vishay.com.
3. Micrel, Inc.: www.micrel.com.
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MIC5295
PCB Layout Recommendations
Top Layer
Bottom Layer
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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.
November 2009
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