Micrel MIC5232-2.8YD5 10ma ultra-low quiescent current î¼cap ldo Datasheet

MIC5232
10mA Ultra-Low Quiescent Current
µCap LDO
General Description
Features
The MIC5232 is an ultra-low quiescent current, lowdropout linear regulator that is capable of operating
from a single-cell lithium ion battery. Consuming only
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.
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.
The MIC5232 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
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.
•
•
•
•
•
•
•
•
•
•
Input voltage range: 2.7V to 7.0V
Ultra-low Iq: Only 1.8µA operating current
Stable with 0.47µF ceramic output capacitor
Low dropout voltage of 100mV @ 10mA
Reverse Battery Protection
High output accuracy:
– +2.0% initial accuracy
– +3.0% over temperature
Logic-Level Enable Input
Miniature 6-pin 2mm x 2mm MLF® package
Lead-Free Thin SOT-23-5 Package
Tight Load and Line Regulation
Applications
•
•
•
•
Real-Time Clock Power Supply
Stand-by Power Supply
SRAM Memory Back-up Supply
Cellular Telephones and Notebook Computers
Typical Application
MIC5232-1.2YD5
VIN
3.6V
VIN
1µF
VOUT
1.2V
VOUT
0.47µF
ceramic
EN
GND
1.5 Real-Time Clock Back-up Supply
3.0
2.7
Ground Pin Current
vs. Input Voltage
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
VOUT = 1.2V
IOUT = 100µA
COUT = 0.47µF
0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
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
September 2008
M9999-090508-C
Micrel, Inc.
MIC5232
Block Diagram
Ordering Information
Marking
Code(1)
Voltage(2)
Junction
Temperature Range
Package
Lead Finish
MIC5232-1.2YD5
ZA12
1.2V
–40°C to +125°C
TSOT-23-5
Pb-Free
MIC5232-2.5YD5
ZA25
2.5V
–40°C to +125°C
TSOT-23-5
Pb-Free
MIC5232-2.8YD5
ZA28
2.8V
–40°C to +125°C
TSOT-23-5
Pb-Free
MIC5232-3.3YD5
ZA33
3.3V
–40°C to +125°C
TSOT-23-5
Part Number
Pb-Free
®(3)
Pb-Free
MIC5232-1.2YML
12Z
1.2V
–40°C to +125°C
6-Pin 2mm x 2mm MLF
MIC5232-2.5YML
25Z
2.5V
–40°C to +125°C
6-Pin 2mm x 2mm MLF®(3)
Pb-Free
–40°C to +125°C
6-Pin 2mm x 2mm MLF
®(3)
Pb-Free
6-Pin 2mm x 2mm MLF
®(3)
Pb-Free
MIC5232-2.8YML
MIC5232-3.3YML
28Z
33Z
2.8V
3.3V
–40°C to +125°C
Notes:
1. Overbar/Underbar symbol (
/ __ ) may not be to scale.
2. Other voltages available. Contact Micrel Inc. for more details.
®
3. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
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MIC5232
Pin Configuration
EN GND VIN
1
3
2
4
NC
EN 1
6
NC
GND 2
5
NC
4
VOUT
VIN 3
5
VOUT
EP
MIC5232-x.xYML
2mm x 2mm MLF® (ML)
MIC5232-x.xYD5
TSOT-23-5 (D5)
Pin Description
Pin Number
TSOT-23-5
Pin Number
MLF
Pin Name
1
3
VIN
Supply Input.
2
2
GND
Ground.
Pin Name
3
1
EN
Enable Input. Active High. High = on, Low = off. Do not leave floating.
4
5
NC
Not Internally Connected.
5
4
VOUT
-
6
NC
Not Internally Connected.
-
EP
EP
Exposed pad connected-to-ground.
September 2008
Output (10mA output current).
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M9999-090508-C
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
Output Voltage Accuracy
Conditions
Variation from nominal VOUT
Variation from nominal VOUT; -40C to +125C
Min
-2.0
-3.0
Typ
Max
+2.0
+3.0
Units
%
%
ppm/C
40
Output Voltage Temp.
Coefficient
Line Regulation
VIN = VOUT +1V to7V;
0.02
0.25
%/V
Load Regulation
IOUT = 10µA to 10mA
0.2
1.0
1.5
Dropout Voltage(6)
IOUT = 100µA
IOUT = 10mA
60
100
300
%
%
mV
mV
IOUT = 10µA
VEN < 0.18V
1.8
0.1
3
1.5
µA
µA
VOUT = 0V
VOUT = VIN + 1V
f = 10Hz
f = 1kHz
COUT =0.47µF; 10Hz to 100kHz
70
0.02
55
35
400
120
1
mA
µA
dB
dB
µVrms
0.18
V
V
nA
nA
ms
Ground Pin Current
Ground Pin Current in
Shutdown
Current Limit
Reverse Current (VOUT > VIN)
Ripple Rejection
Output Voltage Noise
Enable Input
Enable Input Voltage
Enable Input Current
Turn-on Time
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
VIL < 0.18V (Regulator Shutdown)
VIH > 1.4V (Regulator Enabled)
COUT = 0.47µF(7)
1.4
1
1
0.75
1.5
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. 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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Micrel, Inc.
MIC5232
Typical Characteristics
70
60
40
30
20 VOUT = 3.3V
VIN = VOUT + 1V
10 IOUT = 100µA
COUT = 0.47µF
0
0.01 0.1
1
10
100
FREQUENCY (kHz)
DROPOUT VOLTAGE (mV)
160
1000
Dropout Voltage
vs. Temperature
140
80
60
VOUT = 3.3V
IOUT = 10mA
COUT = 0.47µF
20
100 120
TEMPERATURE (°C)
Ground Pin Current
vs. Output Current
12
40
20
VOUT = 3.3V
COUT = 0.47µF
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (mA)
1.4
Output Voltage
vs. Input Voltage
8
6
4
VOUT = 3.3V
VIN = VOUT + 1V
COUT = 0.47µF
2
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Temperature
4
2
0
100 120
TEMPERATURE (°C)
September 2008
20
10
0.6
2.9
2.7
2.6
VOUT = 1.2V
COUT = 0.47µF
1
2
3
4
5
6
INPUT VOLTAGE (V)
2.5
7
Ground Pin Current
vs. Input Voltage
Output Voltage
vs. Temperature
14
VOUT = 3.3V
VIN = VOUT + 1V
COUT = 0.47µF
100 120
TEMPERATURE (°C)
Ground Pin Current
vs. Input Voltage
12
10
8
6
1.2
0.9
0.6
0.3
4
VOUT = 1.2V
IOUT = 100µA
COUT = 0.47µF
2
0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
100
100 120
TEMPERATURE (°C)
2.8
10mA
0.2
3.0
2.7
VOUT = 3.3V
IOUT = 100µA
COUT = 0.47µF
3
20
VOUT = 3.3V
COUT = 0.47µF
0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
5
VOUT = 1.2V
IOUT = 10mA
COUT = 0.47µF
0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
40
VOUT = 3.3V
VIN = VOUT + 1V
IOUT = 10mA
COUT = 0.47µF
30
3.2
3.1
60
6
40
3.3
80
8
50
3.4
14
12
10
60
3.5
18
16
70
0.8 100µA
0
0
Dropout Voltage
vs. Temperature
80
0
2.4
2.1
1.8
1.5
10
GROUND CURRENT (µA)
60
0.4
40
20
80
1
100
14
100
1.2
120
0
90
1
ENABLE THRESHOLD (V)
dB
50
Dropout Voltage
vs. Output Current
DROPOUT VOLTAGE (mV)
120
DROPOUT VOLTAGE (mV)
80
Power Supply
Rejection Ratio
Enable-On Threshold
vs. Temperature
0.8
0.6
0.4
0.2
0
VOUT = 3.3V
VIN = 4.3V
COUT = 0.47µF
100 120
TEMPERATURE (°C)
M9999-090508-C
Micrel, Inc.
MIC5232
Typical Characteristics (continued)
90
1200
80
1000
800
600
400 VOUT = 1.2V
VIN = 2.7V
200 COUT = 0.47µF
IOUT = 100µA
0
100 120
TEMPERATURE (°C)
1E+02
SHORT CUIRCUIT (mA)
1400
Short Circuit Current
vs. Temperature
70
60
50
40
30
20
VOUT = 0V
VIN = 4.3V
COUT = 0.47µF
10
0
100 120
TEMPERATURE (°C)
100
REVERSE CURRENT (nA)
(VOUT CURRENT)
Turn-On Time
Reverse Leakage Current
(V OUT > VIN)
90
80
70
60
50
40
30
20
10
0
2.5
VIN = 2.7V
COUT = 0.47µF
3
3.5
4
4.5
5
5.5
OUTPUT VOLTAGE (V)
Output Noise
Spectral Density
1E+01
1E-00
1E-01 VOUT = 1.2V
VIN = 4.3V
ROUT
COUT = 0.47µF
1E-02
0.1
100
FREQUENCY (kHz)
September 2008
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Micrel, Inc.
MIC5232
Functional Characteristics
Output Current
(5mA/div)
Load Transient Response
0V
10mA
100µA
Output Voltage
(50mV/div)
Output Voltage
(0.5V/div)
Enable Voltage
(2V/div)
Enable Turn-On Transient
0V
VOUT = 1.2V
IOUT = 100mA
COUT = 0.47µF
VIN = VOUT + 1V
VOUT = 3.3V
COUT = 0.47µF
Time (200µs/div)
Time (100µs/div)
Line Transient Response
6V
Output Voltage
(200mV/div)
Input Voltage
(2V/div)
4V
0V
VOUT = 3.3V
IOUT = 1mA
COUT = 0.47µF
0V
Time (200µs/div)
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MIC5232
PD = (4.3V – 3.3V) • 10mA
PD = 0.01W
To determine the maximum ambient operating
temperature of the package, use the junction-toambient thermal resistance of the device and the
following basic equation:
Application Information
Input Capacitor
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).
PD(max) =
Output Capacitors
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.
θ JA
TJ(max) = 125°C, the max. junction temperature of the
die, θJA thermal resistance = 90°C/W
Table 1 shows junction-to-ambient thermal resistance
for the MIC5232 in the 2mm x 2mm MLF®-6 package.
θJA Recommended
Package
Minimum Footprint
®
2mm x 2mm MLF -6
90°C/W
θJC
2°C/W
Table 1. MLF Thermal Resistance
Substituting PD for PD(max), and solving for the
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.
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
operating temperature TA can be determined as
follows:
Minimum Load Current
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.
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.
0.01W =
125°C − T A
90°C / W
TA = 124°C
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:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Thermal Considerations
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:
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.
September 2008
T J (max) − T A
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M9999-090508-C
Micrel, Inc.
MIC5232
Package Information
5-Pin TSOT-23 (D5)
®
6-Pin 2mm x 2mm MLF (ML)
September 2008
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M9999-090508-C
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.
September 2008
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M9999-090508-C
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