MIC5232-3.3YML [MICREL]
10mA Ultra-Low Quiescent Current uCap LDO; 10毫安超低静态电流LDO UCAP
| 型号： | MIC5232-3.3YML |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 10mA Ultra-Low Quiescent Current uCap LDO |
| 文件： | 总10页 (文件大小：310K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5232
10mA Ultra-Low Quiescent Current
µCap LDO
General Description
The MIC5232 is an ultra-low quiescent current, low-
dropout linear regulator that is capable of operating
from a single-cell lithium ion battery. Consuming only
Features
• Input voltage range: 2.7V to 7.0V
• Ultra-low Iq: Only 1.8 A operating current
µ
• Stable with 0.47µF ceramic output capacitor
• Low dropout voltage of 100mV @ 10mA
• Reverse Battery Protection
1.8µA of quiescent current while operating, the
MIC5232 is ideal for stand-by applications like
powering real-time clocks or memory in battery
operated electronics.
• High output accuracy:
– +2.0% initial accuracy
– +3.0% over temperature
The MIC5232 is capable of providing 10mA of output
current and has low output noise, providing a small,
efficient solution ideal for any keep-alive application.
Including reverse current protection, keeping reverse
leakage (VOUT > VIN) down to 20nA.
• Logic-Level Enable Input
• Miniature 6-pin 2mm x 2mm MLF® package
• Lead-Free Thin SOT-23-5 Package
• Tight Load and Line Regulation
The MIC5232 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
Applications
• Real-Time Clock Power Supply
• Stand-by Power Supply
• SRAM Memory Back-up Supply
• Cellular Telephones and Notebook Computers
The MIC5232 is available in fixed output voltages in
the miniature 6-pin 2mm x 2mm MLF® package and
thin SOT-23-5 package with an operating junction
temperature range of -40°C to 125°C.
Typical Application
Ground Pin Current
vs. Input Voltage
MIC5232-1.2YD5
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
VIN
VOUT
1.2V
VOUT
VIN
EN
3.6V
0.47µF
ceramic
1µF
GND
V
OUT
C
= 1.2V
0.6
0.3
0
OUT
I
= 100µA
= 0.47µF
OUT
2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
7
1.5 Real-Time Clock Back-up Supply
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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
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M9999-112006-B
November 2006
Micrel, Inc.
MIC5232
Block Diagram
Ordering Information
Part Number
Voltage(1)
Junction Temperature Range
–40°C to +125°C
Package
TSOT-23-5
Lead Finish
MIC5232-1.2YD5
MIC5232-3.3YD5
MIC5232-1.2YML
MIC5232-3.3YML
1.2V
3.3V
1.2V
3.3V
Pb-Free
Pb-Free
Pb-Free
Pb-Free
–40°C to +125°C
TSOT-23-5
–40°C to +125°C
6-Pin 2mm x 2mm MLF®
6-Pin 2mm x 2mm MLF®
–40°C to +125°C
Note:
1. Other voltages available. Contact Micrel Inc. for more details.
2
M9999-112006-B
November 2006
Micrel, Inc.
MIC5232
Pin Configuration
GND
2
EN
3
VIN
1
EN
GND
VIN
1
2
3
6
5
4
NC
NC
VOUT
4
5
EP
NC
VOUT
MIC5232-x.xYD5
TSOT-23-5 (D5)
MIC5232-x.xYML
2mm x 2mm MLF™ (ML)
Pin Description
Pin Number
TSOT-23-5
Pin Number
MLF
Pin Name Pin Name
1
2
3
4
5
-
3
2
VIN
GND
EN
Supply Input.
Ground.
1
Enable Input. Active High. High = on, Low = off. Do not leave floating.
Not Internally Connected.
5
NC
4
VOUT
NC
Output (10mA output current).
6
Not Internally Connected.
-
EP
EP
Exposed pad connected-to-ground.
3
M9999-112006-B
November 2006
Micrel, Inc.
MIC5232
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN)................................0V to 8V
Enable Input Voltage (VEN)...............................0V to 8V
Power Dissipation (PD).................... Internally Limited(3)
Junction Temperature (TJ).................. –40°C to +125°C
Storage Temperature (TS).................. –65°C to +150°C
Lead Temperature (soldering, 5 sec.)................. 260°C
ESD Rating(4)......................................................... ±2kV
Supply voltage (VIN)...................................... 2.7V to 7V
Enable Input voltage (VEN)...............................0V to VIN
Thermal Resistance
TSOT-23-5 (θJA)......................................... 235°C/W
MLF-6 (θJA) .................................................. 90°C/W
Electrical Characteristics(5)
VIN = VOUT + 1.0V, COUT = 0.47µF, IOUT = 100µA, TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter
Conditions
Min
-2.0
-3.0
Typ
Max
+2.0
+3.0
Units
%
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT; -40C to +125C
%
Output Voltage Temp.
Coefficient
40
ppm/C
Line Regulation
Load Regulation
Dropout Voltage(6)
VIN = VOUT +1V to7V;
IOUT = 10µA to 10mA
IOUT = 100µA
0.02
0.25
%/V
0.2
1.0
1.5
%
%
60
mV
mV
I
OUT = 10mA
IOUT = 10µA
EN < 0.18V
100
300
Ground Pin Current
1.8
0.1
3
µA
µA
Ground Pin Current in
Shutdown
V
1.5
Current Limit
VOUT = 0V
70
0.02
55
120
1
mA
µA
Reverse Current (VOUT > VIN) VOUT = VIN + 1V
Ripple Rejection
f = 10Hz
dB
f = 1kHz
35
dB
Output Voltage Noise
Enable Input
COUT =0.47µF; 10Hz to 100kHz
400
µVrms
Enable Input Voltage
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
VIL < 0.18V (Regulator Shutdown)
VIH > 1.4V (Regulator Enabled)
0.18
V
V
1.4
Enable Input Current
1
1
nA
nA
ms
Turn-on Time
Notes:
C
OUT = 0.47µF(7)
0.75
1.5
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = TJ(max) – TA) / θJA. Exceeding the maximum allowable
power dissipation will result in excessive die temperature.
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below
2.7V, dropout voltage is the input-to-output differential with the minimum input voltage 2.7V.
7. Turn-on time is measured from 10% of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
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November 2006
Micrel, Inc.
MIC5232
Typical Characteristics
Dropout Voltage
vs. Output Current
Dropout Voltage
vs. Temperature
Power Supply
Rejection Ratio
80
120
100
80
60
40
20
0
90
80
70
60
50
40
30
20
10
0
70
60
50
40
30
V
V
I
= 3.3V
OUT
20
10
0
V
I
C
= 3.3V
= 100µA
= 0.47µF
= V
+ 1V
OUT
OUT
OUT
IN
OUT
OUT
OUT
V
C
= 3.3V
= 0.47µF
OUT
OUT
= 100µA
= 0.47µF
C
0.01 0.1
1
10
100 1000
0
1
2
3
4
5
6
7 8 9 10
100120
FREQUENCY (kHz)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
Output Voltage
vs. Input Voltage
Output Voltage
vs. Temperature
160
140
120
100
80
1.4
1.2
1
3.5
3.4
3.3
3.2
3.1
3
100µA
0.8
0.6
0.4
0.2
0
2.9
2.8
2.7
2.6
2.5
60
10mA
40
V
I
= 3.3V
= 10mA
V
V
= 3.3V
OUT
OUT
OUT
IN
V
C
= 1.2V
= 0.47µF
= V
+ 1V
20
OUT
OUT
OUT
C
OUT
= 0.47µF
C
OUT
= 0.47µF
0
0
1
2
3
4
5
6
7
7
7
100120
100120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
Ground Pin Current
vs. Output Current
Ground Pin Current
vs. Input Voltage
Ground Pin Current
vs. Input Voltage
14
12
10
8
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
14
12
10
8
6
6
4
4
V
V
= 3.3V
OUT
V
I
= 1.2V
= 10mA
V
I
= 1.2V
OUT
OUT
= V
+ 1V
2
IN
OUT
2
= 100µA
= 0.47µF
OUT
C
OUT
C
OUT
= 0.47µF
OUT
C
= 0.47µF
OUT
0
0
2.5
3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
0
1
2
3
4
5
6
7
8
9
10
2.5
3
3.5
4 4.5 5 5.5 6 6.5 7
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
Ground Pin Current
vs. Temperature
Current Limit
vs. Input Voltage
Enable-On Threshold
vs. Temperature
20
18
16
14
12
10
8
100
80
60
40
20
0
1
0.8
0.6
0.4
0.2
0
6
V
V
I
= 3.3V
OUT
V
V
= 3.3V
= 4.3V
= V
+ 1V
4
OUT
IN
IN
OUT
OUT
V
= 3.3V
OUT
= 10mA
2
C = 0.47µF
OUT
C
OUT
= 0.47µF
C
OUT
= 0.47µF
0
2.5
3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
100120
TEMPERATURE (°C)
100120
TEMPERATURE (°C)
5
M9999-112006-B
November 2006
Micrel, Inc.
MIC5232
Typical Characteristics (continued)
Turn-On Time
Short Circuit Current
vs. Temperature
Reverse Leakage Current
(V > V
)
IN
OUT
1400
1200
1000
800
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
600
400 V
V
200
= 1.2V
= 2.7V
= 0.47µF
= 100µA
OUT
IN
V
V
C
= 0V
= 4.3V
= 0.47µF
OUT
IN
OUT
C
OUT
V
= 2.7V
IN
I
OUT
C
OUT
= 0.47µF
0
100120
2.5
3
3.5
4
4.5
5
5.5
100120
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Noise
Spectral Density
1E+02
1E+01
1E-00
1E-01
1E-02
V
V
R
= 1.2V
= 4.3V
OUT
OUT
IN
C
= 0.47µF
OUT
0.1
100
FREQUENCY (kHz)
6
M9999-112006-B
November 2006
Micrel, Inc.
MIC5232
Functional Characteristics
Enable Turn-On Transient
Load Transient Response
10mA
0V
100µA
0V
VOUT = 1.2V
IOUT = 100mA
COUT = 0.47µF
V
V
IN = VOUT + 1V
OUT = 3.3V
COUT = 0.47µF
Time (200µs/div)
Time (100µs/div)
Line Transient Response
6V
4V
0V
V
OUT = 3.3V
IOUT = 1mA
COUT = 0.47µF
0V
Time (200µs/div)
7
M9999-112006-B
November 2006
Micrel, Inc.
MIC5232
PD = (4.3V – 3.3V) • 10mA
PD = 0.01W
Application Information
Input Capacitor
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:
If there is more than 20cm of wire between IN and the
ac filter capacitor or if supplied from a battery, a 1µF
(or larger) capacitor should be placed from the IN
(supply input) to GND (ground).
TJ(max) −TA
PD(max)
=
Output Capacitors
θJA
C, the max. junction temperature of the
die, θJA thermal resistance = 90 C/W
The MIC5232 requires an output capacitor for stability.
A 0.47µF, or larger capacitor, is recommended
between OUT (output) and GND to improve the
regulator’s transient response. A 0.47µF capacitor can
be used to reduce overshoot recovery time at the
expense of overshoot amplitude. The ESR (effective
series resistance) of this capacitor has no effect on
regulator stability, but low-ESR capacitors improve the
high frequency transient response. The value of this
capacitor may be increased without limit, but values
larger than 10µF tend to increase the settling time
after a step change in input voltage or output current.
TJ
= 125°
(max)
°
Table 1 shows junction-to-ambient thermal resistance
for the MIC5232 in the 2mm x 2mm MLF®-6 package.
θ
JA Recommended
Minimum Footprint
Package
θJC
2mm x 2mm MLF®-6
90°
C/W
2°C/W
Table 1. MLF Thermal Resistance
Substituting P
D for PD(max), and solving for the
Minimum Load Current
ambient operating temperature, will give the maximum
operating conditions for the regulator circuit. The
junction-to-ambient thermal resistance for the
minimum footprint is 90°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation.
The MIC5232 does not require a minimum load for
proper operation. This allows the device to operate in
applications where very light output currents are
required for keep-alive purposes. This is important for
powering SRAM or Flash memory in low-power
modes for handheld devices.
For example, when operating the MIC5232-3.3BML at
an input voltage of 4.3V and 10mA load with a
minimum footprint layout, the maximum ambient
Safe Operating Conditions
The MIC5232 incorporates current limit in the design.
There is also reverse circuit protection circuitry built
into the device. The maximum junction temperature
for the device is +125°C, and it is important that this is
not exceeded for any length of time.
operating temperature T
follows:
A can be determined as
125°C −TA
90°C /W
0.01W =
TA = 124°C
Thermal Considerations
Therefore, a 3.3V application at 10mA of output
current can accept an ambient operating temperature
of 124°C in a 2mm x 2mm MLF®-6 package. For a full
discussion of heat sinking and thermal effects on
voltage regulators, refer to the “Regulator Thermals”
section of Micrel’s “Designing with Low-Dropout
Voltage Regulators” handbook. This information can
be found on Micrel's website at:
The MIC5232 is designed to provide 10mA of
continuous current in a very small package. Maximum
ambient operating temperature can be calculated
based on the output current and the voltage drop
across the part. Given that the input voltage is 4.3V,
the output voltage is 3.3V and the output current =
10mA.
The actual power dissipation of the regulator circuit
can be determined using the equation:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
PD = (VIN – VOUT) IOUT + VIN IGND
Because this device is CMOS and the ground current
is typically <15µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
8
M9999-112006-B
November 2006
Micrel, Inc.
MIC5232
Package Information
5-Pin TSOT-23 (D5)
6-Pin 2mm x 2mm MLF® (ML)
9
M9999-112006-B
November 2006
Micrel, Inc.
MIC5232
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.
© 2005 Micrel, Inc.
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M9999-112006-B
November 2006
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