MICREL MIC5307

MIC5307
300mA Micropower µCap
Baseband LDO
General Description
Features
The MIC5307 is a micropower, µCap low dropout regulator
designed for optimal performance where smaller packages
are required. It is capable of sourcing 300mA of output
current while only drawing 20µA of operating current. This
high performance LDO offers fast transient response and
good PSRR while consuming a minimum of current.
Ideal for battery operated applications; the MIC5307 offers
1% initial accuracy, extremely low dropout voltage and is
equipped with a TTL logic compatible enable pin. The
MIC5307 can be put into a zero-off-mode current state,
drawing no current when disabled.
The MIC5307 is a µCap design, operating with very small
ceramic output capacitors for stability, reducing required
board space and component cost.
The MIC5307 is available in fixed output voltages in the
Thin SOT23-5 package and the 6-pin 2mm x 2mm Thin
MLF® package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
•
•
•
•
•
Input voltage range: 2.4V to 5.5V
Ultra-low IQ: Only 20µA operating current
Stable with ceramic output capacitor
Low dropout voltage of 120mV @ 300mA
High output accuracy
– ±1.0% initial accuracy
– ±2.0% over temperature
• Thermal Shutdown Protection
• Current Limit Protection
Applications
•
•
•
•
•
•
Digital Logic Power Supply
Stand-by power supply
Cellular phones
PDAs
Portable electronics
Notebook PCs
Typical Application
MIC5307
VIN
VOUT
EN
GND
1µF
2.2µF
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Ground Pin Current
vs. Temperature
300mA
100µA
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
20 40 60 80
TEMPERATURE (°C)
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
August 2007
M9999-082407-B
Micrel, Inc.
MIC5307
Block Diagram
VIN
VOUT
EN
VREF
QuickStart
Thermal
Shutdown
Error
LDO
Amp
Current
Limit
GND
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MIC5307
Ordering Information(1)
Part Number
Marking Code
Voltage
Temperature Range
Package
Lead Finish
MIC5307-1.5YD5
QQ15*
1.5V
–40°C to +125°C
5-Pin TSOT23
Pb-Free
MIC5307-1.8YD5
QQ18*
1.8V
–40°C to +125°C
5-Pin TSOT23
Pb-Free
MIC5307-2.8YD5
QQ28*
2.8V
–40°C to +125°C
5-Pin TSOT23
Pb-Free
MIC5307-3.0YD5
QQ30*
3.0V
–40°C to +125°C
5-Pin TSOT23
MIC5307-2.8YMT
Q28**
2.8V
–40°C to +125°C
Pb-Free
6-Pin 2mm x 2mm Thin MLF
®
Pb-Free
Notes
* Underbar ( _ ) symbol may not be to scale.
** 2x2mm Thin MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
EN GND VIN
1
3
2
4
N/C
5
OUT
EN 1
6 NC
GND 2
5 NC
VIN 3
MIC5307-x.xYD5
5-Pin Thin SOT23 (D5)
4 VOUT
MIC5307-x.xYMT
6-Pin 2mm x 2mm Thin MLF® (MT)
Pin Description
Pin Number
TSOT23
Pin Number
Thin MLF®
Pin Name
Pin Function
1
3
VIN
Supply Input
2
2
GND
Ground
3
1
EN
Enable Input. Active High. High = on, low = off. Do not leave floating
4
5
NC
No Connect
5
4
VOUT
–
6
NC
August 2007
Output Voltage
No Connect
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Micrel, Inc.
MIC5307
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) ............................................... 0V to 6V
Enable Input Voltage (VEN)..................................... 0V to 6V
Power Dissipation (PD)(3) ...........................Internally Limited
Junction Temperature (TJ) ........................–40°C to +125°C
Lead Temperature (soldering, 5sec.)......................... 260°C
Storage Temperature (Ts) .........................–65°C to +150°C
ESD Rating(4) .................................................................. 2kV
Supply voltage (VIN) ....................................... 2.4V to +5.5V
Enable Input Voltage.............................................. 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Thermal Resistance
TSOT23-5 (θJA)................................................235°C/W
2x2 Thin MLF-6 (θJA) .........................................93°C/W
Electrical Characteristics(5)
VIN = VOUT + 1.0V; COUT = 2.2µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter
Condition
Output Voltage Accuracy
Line Regulation
Variation from nominal VOUT
Variation from nominal VOUT; –40°C to +125°C
VIN = VOUT +1V to 5.5V
Load Regulation
IOUT = 100µA to 300mA
0.5
Dropout Voltage(4)
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
IOUT = 300mA
IOUT = 0mA to 150mA; VIN = 5.5V
IOUT = 0mA to 300mA; VIN = 5.5V
VEN < 0.2V; VIN = 5.5V
f = 10Hz to 1kHz; COUT = 2.2µF; IOUT = 300mA
f = 20kHz; COUT = 2.2µF; IOUT = 300mA
VOUT = 0V
20
40
60
120
18
20
0.01
62
35
500
160
20
80
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(6)
Min
Typ
–1
–2
0.01
350
COUT = 2.2µF; 10Hz to 100kHz
Max
Units
+1
+2
0.3
0.5
1
1.5
%
%
%/V
%/V
%
%
mV
mV
mV
mV
µA
µA
µA
dB
dB
mA
°C
°C
µVRMS
250
30
1
800
0.2
Logic Low
Logic High
VIL < 0.2V
VIH > 1.0V
COUT = 2.2µF
1.0
0.01
0.01
270
1
1
500
V
V
µA
µA
µs
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. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. 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.
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MIC5307
Typical Characteristics
26
24
22
20
18
16
14
12
10
8
6
4
2
0
0
Ground Pin Current
vs. Output Current
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
Power Supply
Rejection Ratio
-80
-70
26
24
22
20
18
16
14
12
10
8
6
4
2
0
150
Ground Pin Current
vs. Supply Voltage
Ground Pin Current
vs. Temperature
300mA
100µA
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
20 40 60 80
TEMPERATURE (°C)
Dropout Voltage
vs. Output Current
160
125
100
50mA
-40
100
75
-30
50
-20
VIN = VOUT + 1V
-10 VOUT = 2.8V
COUT = 2.2µF
0
0.1
1
10
100
FREQUENCY (kHz)
25
1,000
Output Voltage
vs. Output Current
0
0
600
VOUT = 2.8V
COUT = 2.2µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
Current Limit
vs. Input Voltage
150mA
60
100mA
40
50mA
20
0
100µA
20 40 60 80
TEMPERATURE (°C)
Output Voltage
vs. Temperature
3.2
560
3.0
540
2.8
80
3.4
580
2.9
2.8
520
2.6
500
2.7
3.2
300mA
120
-50 300mA
2.6
0
Dropout Voltage
vs. Temperature
VOUT = 2.8V
140 COUT = 2.2µF
150mA
-60
3.0
26
24
22
300mA
20
18
100µA
16
14
12
10
8
6
4
VOUT = 2.8V
2
COUT = 2.2µF
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
2.4
480
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
VOUT = 2.8V
COUT = 2.2µF
460
50 100 150 200 250 300
OUTPUT CURRENT (mA)
Output Voltage
vs. Supply Voltage
440
3.0
10
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
5.5
2.2
2.0
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
IOUT = 100µA
20 40 60 80
TEMPERATURE (°C)
Output Noise
Spectral Density
2.8
2.4
100µA
1
300mA
2.0
0.1
1.6
1.2
0.01 VIN = 3.8V
VOUT = 2.8V
COUT = 2.2µF
0.8
VOUT = 2.8V
COUT = 2.2µF
0.4
0
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
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0.001
0.01
0.1
1
10
100 1,000
FREQUENCY (kHz)
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M9999-082407-B
Micrel, Inc.
MIC5307
Functional Characteristics
Enable Turn-On
Enable
(1V/div)
Output Voltage
(200mV/div)
Load Transient Response
Output Current
(100mA/div)
Output Voltage
(1V/div)
300mA
VIN = VOUT + 1V
VOUT = 2.8V
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
COUT = 2.2µF
Time (10µs/div)
Time (100µs/div)
Line Transient Response
5V
Input Voltage
(2V/div)
4V
VIN = VOUT + 1V
Output Voltage
(20mV/div)
VOUT = 2.8V
COUT = 2.2µF
Time (200µs/div)
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MIC5307
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.
Application 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) ⋅ 300mA
PD = 0.3W
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:
TJ(max) – TA
PD(max) =
Output Capacitance
The MIC5307 requires an output capacitor of 2.2µF or
greater to maintain stability. The design is optimized for
use with low-ESR ceramic chip capacitors. High ESR
capacitors may cause high frequency oscillation. The
output capacitor can be increased, but performance has
been optimized for a 2.2µF ceramic output capacitor and
does not improve significantly with larger capacitance.
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
an X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
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 MIC5307 in the TSOT23-5 package.
θJA Recommended
Minimum Footprint
TSOT23-5
235°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-toambient thermal resistance for the minimum footprint is
235°C/W, from Table 1. The maximum power dissipation
must not be exceeded for proper operation.
For example, when operating the MIC5307-2.8 at an
input voltage of 3.8V and 300mA load with a minimum
footprint layout, the maximum ambient operating
temperature TA can be determined as follows:
0.3W = (125°C - TA) / 235C°/W
TA = 54.5°C
Therefore, a 2.8V application at 300mA 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:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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
MIC5307. Even with the output grounded, current will be
limited to approximately 500mA. Further protection is
provided by thermal shutdown.
Thermal Considerations
The MIC5307 is designed to provide 300mA 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 300mA.
The actual power dissipation of the regulator circuit can
be determined using the equation:
PD = (VIN – VOUT) IOUT + VIN IGND
August 2007
Package
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Micrel, Inc.
MIC5307
Package Information
5-Pin Thin SOT23 (D5)
6-Pin 2mm x 2mm Thin MLF® (MT)
August 2007
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Micrel, Inc.
MIC5307
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.
© 2006 Micrel, Incorporated.
August 2007
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