MICREL MIC5306

MIC5306
150mA Micropower µCap Baseband LDO
General Description
Features
The MIC5306 is a micropower, µCap low dropout
regulator designed for optimal performance in a small
space. It is capable of sourcing 150mA of output current
and only draws 16µA of operating current. This high
performance LDO offers fast transient response and
good PSRR while consuming a minimum of current.
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Ideal for battery operated applications; the MIC5306
offers 1% accuracy, extremely low dropout voltage
(45mV @ 100mA). Equipped with a TTL logic
compatible enable pin, the MIC5306 can be put into a
zero-off-mode current state, drawing no current when
disabled.
The MIC5306 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
The MIC5306 is available in fixed output voltages in
Thin SOT23-5 packaging.
Input voltage range: 2.25V to 5.5V
Ultra-low IQ: Only 16µA operating current
Stable with ceramic output capacitor
Low dropout voltage of 45mV @ 100mA
High output accuracy
- ±1.0% initial accuracy
- ±2.0% over temperature
• Thermal Shutdown Protection
• Current Limit Protection
Applications
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Digital Logic Power Supply
Stand-by power supply
Cellular phones
PDAs
Portable electronics
Notebook PCs
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Typical Application
20
18
MIC5306
VIN
1µF
GND
150mA
16
VOUT
EN
Ground Pin Current
vs. Temperature
1µF
Applications
Co-processor
14
100µA
12
10
8
6
4
2
0
VOUT = 2.8V
VIN = VOUT + 1V
COUT = 1µF
TEMPERATURE (°C)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2005
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Block Diagram
VIN
OUT
EN
1.25V
Reference
GND
Ordering Information
Part Number
Marking Code
MIC5306-1.5YD5
MIC5306-2.8YD5
N915
N928
Output
Voltage
1.5V
2.8V
Junction Temperature Range
Package
-40°C to 125°C
-40°C to 125°C
TSOT23-5
TSOT23-5
Note:
Other Voltage available. Contact Micrel for detail.
August 2005
2
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Pin Configuration
EN GND VIN
1
3
2
4
N/C
5
OUT
MIC5306-x.xBD5
Pin Description
August 2005
TSOT23
Pin No.
Pin
Description
Pin Function
1
IN
Supply Input
2
GND
3
EN
4
NC
5
OUT
Ground
Enable Input. Active High. High = on, low = off.
Do not leave floating.
No Connect
Output Voltage
3
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN) .............................. 0V to 6V
Enable Input Voltage (VEN)............................. 0V to 6V
Power Dissipation (PD) ...................Internally Limited(3)
Junction Temperature ....................... -40°C to +125°C
Lead Temperature (soldering, 5sec.) .................260°C
Storage Temperature (Ts) ................. -65°C to +150°C
Supply Input Voltage (VIN)........................2.25V to 5.5V
Enable Input Voltage (EN1/EN2/LOWQ).................. 0V to VIN
Junction Temperature (TJ) .................. -40°C to +125°C
TSOT23-5(θJA) ............................................... 235°C
Electrical Characteristics
VIN = VOUT + 1.0V; COUT = 1.0µF, IOUT = 100µA; TI = 25°C, bold values indicate -40°C to +125, unless noted.
Parameter
Line Regulation
Conditions
Variation from nominal VOUT
Variation from nominal VOUT; -40°C to +125°C
VIN = VOUT +1V to 5.5V
Load Regulation
IOUT = 100µA to 150mA
Output Voltage Accuracy
Dropout Voltage(4)
Ground Pin Current
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
Thermal Shutdown
Thermal Shutdown Hysteresis
Output Voltage Noise
Enable Input
Enable Input Voltage
Enable Input Current
Turn-on Time(5)
Min
-1
-2
Typ
0.01
0.5
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
IOUT = 0mA to 150mA; VIN = 5.5V
Max
+1
+2
0.3
0.5
1
1.5
Units
%
%
%/V
%
25
45
65
200
16
25
µA
VEN < 0.2V; VIN = 5.5V
0.01
1
µA
f = 10Hz to 1kHz; COUT = 1µF; IOUT = 150mA
f = 20kHz; COUT = 1µF; IOUT = 150mA
VOUT = 0V
62
35
285
150
15
91
175
COUT = 1µF; 10Hz to 100kHz
Logic Low
Logic High
VIL < 0.2V
VIH > 1.0V
COUT = 1µF
mV
dB
500
mA
°C
°C
µVrms
0.2
V
V
µA
µA
µs
1.0
0.01
0.01
250
1
1
500
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, and the regulator will go into thermal shutdown.
4. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential. For outputs below 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V.
5. Turn-on time is measured from Ven=1V of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
August 2005
4
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Typical Characteristics
Ripple Rejection
20
-60
100µA
-40
-30
-20
VOUT = 2.8V
-10 VIN = VOUT + 1V
COUT = 1µF
0
0.01 0.1
1
10
100 1000
FREQUENCY (kHz)
GROUND CURRENT (uA)
18
Ground Pin Current
vs. Supply Voltage
150mA
16
14
100µA
12
10
8
6
4
VOUT = 2.8V
COUT = 1µF
2
0
2
3
2.5
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
60
50
40
30
10
VOUT = 2.8V
VIN = VOUT + 1V
COUT = 1µF
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
150mA
100µA
VOUT = 2.8V
VIN = VOUT + 1V
COUT = 1µF
TEMPERATURE (°C)
Dropout Voltage
vs. Output Current
70
20
2
0
Ground Pin Current
vs. Temperature
100
90
80
70
60
50
40
30
20
Dropout Voltage
vs. Temperature
150mA
100mA
50mA
25mA
10
0
TEMPERATURE (°C)
1E+02
Output Noise
Spectral Density
1E+01
3
2.8
1E-00
2.6
2.4
VOUT = 2.8V
COUT = 1µF
2.2
2
1
2
3
4
5
SUPPLY VOLTAGE (V)
Current Limit
vs. Supply Voltage
300
250
200
150
100
VOUT = 2.8V
COUT = 1µF
0
3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4
SUPPLY VOLTAGE (V)
VOUT = 2.8V
VIN = VOUT + 1V
COUT = 1µF
IOUT = 100µA
TEMPERATURE (°C)
1
ENABLE THRESHOLD (V)
OUTPUT CURRENT (mA)
VOUT = 2.8V
VIN = VOUT + 1V
COUT = 1µF
3.2
1
August 2005
2
3.4
1.5
50
6
4
Output Voltage
vs. Temperature
2 100µA
350
8
6
4
8
Output Voltage
vs. Supply Voltage
150mA
0
0
10
0
0
2.5
0.5
12
80
3 3.5 4 4.5 5 5.5
SUPPLY VOLTAGE (V)
16
14
12
10
16
14
0
0
DROPOUT VOLTAGE (mV)
dB
-50
20
18
18
DROPOUT VOLTAGE (mV)
150mA
-70
GROUND CURRENT (µA)
-80
Ground Pin Current
vs. Output Current
1E-01 VOUT = 2.8V
VIN = 3.8V
COUT = 1µF
ROUT
1E-02
0.01 0.1
1
10 100 1000 10000
FREQUENCY (kHz)
Enable Threshold
vs. Temperature
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
TEMPERATURE (C)
5
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Functional Characteristics
Enable Turn-On Transient
5V
4V
Output Voltage
(20mV/div)
Output Voltage
(1V/div)
Input Voltage
(1V/div)
Enable Voltage
(1V/div)
Line Transient Response
VOUT = 2.8V
VIN = V OUT + 1V
COUT = 1µF
VOUT = 2.8V
VIN = VOUT + 1V
COUT = 1µF
Time (400µs/div)
Time (100µs/div)
Output Current
(10mA/div)
Output Voltage
(50mV/div)
Load Transient Response
VOUT = 2.8V
VIN = V OUT + 1V
COUT = 1µF
Time (10µs/div)
August 2005
6
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Because this device is CMOS and the ground current
is typically < 50µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
Applications Information
Input Capacitance
A 1µF capacitor should be placed from IN to GND if
there is more than 10 inches of wire between the input
and the ac filter capacitor or if a battery is used as the
input.
PD = (3.8V – 2.8V) ⋅ 150mA
PD = 0.15W
To determine the maximum ambient operating
temperature of the package, use the junction-toambient thermal resistance of the device and the
following basic equation:
Output Capacitance
An output capacitor is required between OUT and
GND to prevent oscillation. Larger values improve the
regulator’s transient response. The output capacitor
value may be increased without limit.
PD(max) =
The output capacitor should have below ESR 300mΩ
and a resonant frequency above 1MHz. Ultra-low-ESR
capacitors can cause a low amplitude oscillation on
the output and/or underdamped transient response.
Most tantalum or aluminum electrolytic capacitors are
adequate; film types will work, but are more
expensive. Since many aluminum electrolytics have
electrolytes that freeze at about –30°C, solid
tantalums are recommended for operation below
–25°C.
JA
TJ(max) = 125°C, the maximum junction temperature
of the die θJA thermal resistance = 235°C/W
Table 1 shows junction-to-ambient thermal resistance
for the MIC5306 in the TSOT23-5 package.
At lower values of output current, less output
capacitance is required for output stability. The
capacitor can be reduced to 0.47µF for current below
10mA or 0.33µF for currents below 1mA.
Package
θJA Recommended
Minimum Footprint
θJC
TSOT23-5
235°C/W
2°C/W
Table 1. TSOT23-5 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 235°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation.
Enable
Forcing EN (enable/shutdown) high (>1V) enables the
regulator. EN is compatible with CMOS logic gates. If
the enable/shutdown feature is not required, connect
EN (pin 3) to IN (supply input, pin 1).
Current Limit
There is overcurrent protection circuitry built into the
MIC5306. Even with the output grounded, current will
be limited to approximately 285mA. Further protection
is provided by thermal shutdown.
For example, when operating the MIC5306-2.8 at an
input voltage of 3.8V and 150mA load with a minimum
footprint layout, the maximum ambient operating
temperature TA can be determined as follows:
0.15W = (125°C - T) / 235C°/W
Thermal Considerations
The MIC5306 is designed to provide 150mA 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 3.8V,
the output voltage is 2.8V and the output current
equals 150mA.
T = 89.75°C
Therefore, a 2.8V application at 150mA of output
current can accept an ambient operating temperature
of 89.8°C in a TSOT23-5 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 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
August 2005
TJ(max) – TA
7
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Package Information
5-Pin TSOT-23
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.
August 2005
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M9999-080805
(408) 955-1690