MIC5235-2.7BM5 [MICREL]
Ultra-Low Quiescent Current, 150mA UCap LDO Regulator; 超低静态电流， 150毫安UCAP LDO稳压器
| 型号： | MIC5235-2.7BM5 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Ultra-Low Quiescent Current, 150mA UCap LDO Regulator |
| 文件： | 总9页 (文件大小：67K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5235
Ultra-Low Quiescent Current, 150mA µCap LDO Regulator
General Description
Features
The MIC5235 is a 150mA highly accurate, low dropout
regulatorwithhighinputvoltageandultra-lowgroundcurrent.
This combination of high voltage and low ground current
makes the MIC5235 ideal for USB and portable electronics
applications, using1-cell, 2-cellor3-cellLi-Ionbatteryinputs.
• Wide input voltage range: 2.3V to 24V
• Ultra low ground current: 18µA
• Low dropout voltage: 310mV at 150mA
• High output accuracy: ±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 package
A µCap LDO design, the MIC5235 is stable with either
ceramicortantalumoutputcapacitor. Itonlyrequiresa2.2µF
capacitor for stability.
Features of the MIC5235 includes enable input, thermal
shutdown, current limit, reverse battery protection, and
reverse leakage protection.
Applications
• USB power supply
• Cellular phones
Available in fixed and adjustable output voltage versions, the
MIC5235 is offered in the IttyBitty™ SOT-23-5 package with
a junction temperature range of –40°C to +125°C.
• Keep-alive supply in notebook and portable computers
• Logic supply for high-voltage batteries
• Automotive electronics
• Battery powered systems
Ordering Information
Part Number
Marking Voltage
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
MIC5235-1.5BM5
MIC5235-1.8BM5
MIC5235-2.5BM5
MIC5235-2.7BM5
MIC5235-3.0BM5
MIC5235-3.3BM5
MIC5235-5.0BM5
MIC5235BM5
L215
L218
L225
L227
L230
L233
L250
L2AA
1.5V
1.8V
2.5V
2.7V
3.0V
3.3V
5.0V
ADJ.
Typical Application
40
35
30
25
20
15
10
MIC5235BM5
VIN
CIN=1.0µF
VOUT=1.8V
1
5
IOUT = 1mA
2
3
R1
R2
COUT=2.2µF
ceramic
IOUT = 100µA
4
OFF ON
IGND=18µA
EN
IOUT = 10µA
4
9
14
19
24
INPUT VOLTAGE (V)
Ultra-Low Current Adjustable Regulator Application
Ground Current vs. Input Voltage
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
August 2003
1
MIC5235
MIC5235
Micrel
Pin Configuration
EN GND IN
3
2
1
L2xx
4
5
NC or
ADJ.
OUT
SOT-23-5
Pin Description
SOT-23-5
Pin Name
IN
Pin Function
1
2
3
4
Supply Input
GND
EN
Ground
Enable (Input): Logic low = shutdown; logic high = enable
No Connect
NC (fixed)
ADJ (ADJ.)
Adjust (Input): Feedback input. Connect to resistive voltage-divider network.
Regulator Output
5
OUT
MIC5235
2
August 2003
MIC5235
Micrel
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 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, Note 3
Input Supply Voltage ........................................ 2.3V to 24V
Enable Input Voltage ........................................... 0V to 24V
Junction Temperature (T ) ....................... –40°C to +125°C
J
Package Thermal Resistance
SOT-23-5 (θ ) ..................................................235°C/W
JA
Electrical Characteristics (Note 4)
TA = 25°C with VIN = VOUT + 1V; IOUT = 100µA , 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
%
%
1
50
230
mV
mV
mV
mV
mV
mV
mV
IOUT = 50mA
300
400
400
450
450
500
IOUT = 100mA
IOUT = 150mA
270
310
Ground Current
I
OUT = 100µA
18
30
35
0.7
2
µA
µA
mA
mA
mA
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
0.35
1
2
4
Ground Current in Shutdown
Short Circuit Current
V
EN ≤ 0.6V; VIN = 24V
0.1
350
–0.1
1
µA
mA
µA
VOUT = 0V
500
Output Leakage,
Load = 500Ω; VIN = –15V
Reverse Polarity Input
Enable Input
Input Low Voltage
Input High Voltage
Enable Input Current
Regulator OFF
Regulator ON
0.6
V
V
2.0
VEN = 0.6V; Regulator OFF
–1.0
0.01
0.1
0.5
1.0
1.0
2.5
µA
µA
µA
VEN = 2.0V; Regulator ON
VEN = 24V; Regulator ON
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4. Specification for packaged product only.
August 2003
3
MIC5235
MIC5235
Micrel
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
ILOAD = 150mA
IOUT = 150mA
60
50
40
30
20
10
0
0
0
0.01 0.1
1
10
100 1000
0
20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
-40 -20
0
20 40 60 80 100120
FREQUENCY (kHz)
TEMPERATURE (°C)
Ground Pin Current
vs. Output Current
Dropout
Characteristics
Ground Pin Current
vs. Output Current
3000
2500
2000
1500
1000
500
3.5
3
30
28
26
24
22
20
18
16
14
12
10
ILOAD = 100µA
VIN = 4V
ILOAD = 75mA
2.5
2
VIN = 24V
VIN = 12V
1.5
1
ILOAD = 150mA
VIN = 4V
0.5
0
0
0
20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
0
0.5
1
1.5
2
2.5
3
3.5
4
0
100 200 300 400 500
OUTPUT CURRENT (µA)
INPUT VOLTAGE (V)
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
2.5
2.4
2.3
2.2
2.1
2
ILOAD = 10mA
ILOAD = 75mA
ILOAD = 150mA
1.9
1.8
1.7
1.6
1.5
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
-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
2.4
2.2
2
40
35
30
25
20
15
10
IOUT = 10mA
IOUT=150mA
1.8
1.6
1.4
1.2
1
IOUT = 1mA
IOUT = 1mA
IOUT = 100µA
IOUT = 100µA
IOUT = 75mA
0.8
0.6
0.4
IOUT = 10µA
IOUT = 10µA
1.5
2
2.5
3
3.5
4
1.5
2
2.5
3
3.5
4
4
9
14
19
24
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
MIC5235
4
August 2003
MIC5235
Micrel
Input Current
vs. Supply Voltage
Output Voltage
vs. Temperature
Short Circuit Current
vs. Temperature
120
3.05
3.04
3.03
3.02
3.01
3
400
350
300
250
200
150
100
50
ILOAD = 100µA
100
80
60
40
20
0
2.99
2.98
2.97
2.96
2.95
VEN = 5V
RLOAD = 30Ω
VIN = 4V
0
-20
-10
0
10
-40 -20
0
20 40 60 80 100120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100120
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Load Transient Response
150mA
0mA
VIN = 4V
VOUT = 3V
COUT = 4.7µF ceramic
TIME (400µs/div.)
August 2003
5
MIC5235
MIC5235
Micrel
Functional Diagrams
OUT
IN
EN
ENABLE
VREF
GND
Block Diagram – Fixed Output Voltage
OUT
IN
EN
ENABLE
R1
VREF
ADJ
R2
GND
Block Diagram – Adjustable Output Voltage
MIC5235
6
August 2003
MIC5235
Micrel
Recommended
Applications Information
Package
θ
JA
Minimum Footprint
Enable/Shutdown
SOT-23-5
235°C/W
The MIC5235 comes with an active-high enable pin that
allowstheregulatortobedisabled.Forcingtheenablepinlow
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.
Table 1. SOT-23-5 Thermal Resistance
The actual power dissipation of the regulator circuit can be
determined using the equation:
P = (V – V
)I
+ V I
D
IN
OUT OUT IN GND
Substituting P
for P and solving for the operating
D
Input Capacitor
D(MAX)
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit. For
example, when operating the MIC5235-3.0BM5 at 50°C with
a minimum footprint layout, the maximum input voltage for a
set output current can be determined as follows:
TheMIC5235hashighinputvoltagecapabilityupto24V. 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 capaci-
tors can be used for bypassing. Larger values may be
required if the source supply has high ripple.
125°C − 50°C
PD(MAX)
=
235°C/W
Output Capacitor
P
= 319mW
D(MAX)
The MIC5235 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.
The junction-to-ambient (θ ) thermal resistance for the
JA
minimum footprint is 235°C/W, from Table 1. It is important
that the maximum power dissipation not be exceeded to
ensure proper operation. Since the MIC5235 was designed
to operate with high input voltages, careful consideration
mustbegivensoasnottooverheatthedevice. Withveryhigh
input-to-output voltage differentials, the output current is
limited by the total power dissipation. Total power dissipation
is calculated using the following equation:
X7R/X5R dielectric-type ceramic capacitors are recom-
mended because of their temperature performance. X7R-
type capacitors change capacitance by 15% over their oper-
ating temperature range and are the most stable type of
ceramiccapacitors.Z5UandY5Vdielectriccapacitorschange
value by as much as 50% and 60% respectively over their
operatingtemperatureranges. Touseaceramicchipcapaci-
tor with Y5V dielectric, the value must be much higher than a
X7R ceramic capacitor to ensure the same minimum capaci-
tance over the equivalent operating temperature range.
P = (V – V
)I
+ V x I
D
IN
OUT OUT IN GND
Due to the potential for input voltages up to 24V, ground
current must be taken into consideration.
If we know the maximum load current, we can solve for the
maximum input voltage using the maximum power dissipa-
tion calculated for a 50°C ambient, 319mV.
P
= (V – V
)I
+ V x I
DMAX
IN
OUT OUT IN GND
319mW = (V – 3V)150mA + V x 2.8mA
IN
IN
No-Load Stability
Ground pin current is estimated using the typical character-
istics of the device.
TheMIC5235willremainstableandinregulationwithnoload
unlike many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
769mW = V (152.8mA)
IN
V
= 5.03V
Thermal Considerations
IN
For higher current outputs only a lower input voltage will work
for higher ambient temperatures.
The MIC5235 is designed to provide 150mA of continuous
current in a very small package. Maximum power dissipation
canbecalculatedbasedontheoutputcurrentandthevoltage
drop across the part. To determine the maximum power
dissipation of the package, use the junction-to-ambient ther-
malresistanceofthedeviceandthefollowingbasicequation:
Assumingaloweroutputcurrentof20mA,themaximuminput
voltage can be recalculated:
319mW = (V – 3V)20mA + V x 0.2mA
IN
IN
379mW = V x 20.2mA
IN
T
J(MAX) − TA
θJA
is the maximum junction temperature of the die,
V
= 18.8V
IN
PD(MAX)
=
Maximum input voltage for a 20mA load current at 50°C
ambient temperature is 18.8V, utilizing virtually the entire
operating voltage range of the device.
T
J(MAX)
125°C, and T is the ambient operating temperature. θ is
A
JA
layout dependent; Table 1 shows examples of the junction-
to-ambient thermal resistance for the MIC5235.
August 2003
7
MIC5235
MIC5235
Micrel
Adjustable Regulator Application
The MIC5235BM5 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:
R1
VOUT = VREF 1+
R2
Where V
= 1.24V.
REF
Feedback resistor R2 should be no larger than 300kΩ.
MIC5235BM5
VIN
VOUT
IN
OUT
ADJ.
R1
R2
EN
2.2µF
1.0µF
GND
Figure 1. Adjustable Voltage Application
MIC5235
8
August 2003
MIC5235
Micrel
Package Information
1.90 (0.075) REF
0.95 (0.037) REF
1.75 (0.069) 3.00 (0.118)
1.50 (0.059) 2.60 (0.102)
DIMENSIONS:
MM (INCH)
1.30 (0.051)
0.90 (0.035)
3.02 (0.119)
2.80 (0.110)
0.20 (0.008)
0.09 (0.004)
10°
0°
0.15 (0.006)
0.00 (0.000)
0.50 (0.020)
0.35 (0.014)
0.60 (0.024)
0.10 (0.004)
SOT-23-5 (M5)
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
The information furnished by Micrel in this datasheet 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2003 Micrel, Incorporated.
August 2003
9
MIC5235
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