MIC5307
300mA Micropower µCap
Baseband LDO
MLF and MicroLeadFrame are re gistered 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
General Description
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 minimu m 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.
Features
• 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
VOUTVIN
EN GND
2.2µF
1µF
MIC5307
0
2
4
6
8
10
12
14
20
22
24
26
20 40 60 80
TEMPERATURE (°C)
Ground Pin Current
vs. Temperature
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 2.2µF
100µA
300mA
16
18
Micrel, Inc. MIC5307
August 2007 2 M9999-082407-B
Block Diagram
V
IN
EN
VOUT
GND
Current
Limit
LDO
Quick-
Start
V
REF
Thermal
Shutdown
Error
Amp
Micrel, Inc. MIC5307
August 2007 3 M9999-082407-B
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 Pb-Free
MIC5307-2.8YMT Q28** 2.8V –40°C to +125°C 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 Configur ation
EN GND
N/C OUT
VIN
31
5
2
4
1EN
GND
VIN
6NC
NC
VOUT
5
4
2
3
MIC5307-x.xYD5
5-Pin Thin SOT23 (D5) 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 Output Voltage
– 6 NC No Connect
Micrel, Inc. MIC5307
August 2007 4 M9999-082407-B
Absolute Maximum Ratings(1)
Supply Voltage (V
IN
)............................................... 0V to 6V
Enable Input Voltage (V
EN
)..................................... 0V to 6V
Power Dissi pation (P
D
)
(3)
...........................Internally Limited
Junction Temperature (T
J
) ........................–40°C to +125°C
Lead Temperature (soldering, 5sec.).........................260°C
Storage Temperature (T
s
).........................–65°C to +150°C
ESD Rating
(4)
..................................................................2kV
Operating Ratings(2)
Supply voltage (V
IN
) ....................................... 2.4V to +5.5V
Enable Input Voltage..............................................0V to V
IN
Junction Temperature (T
J
) ........................–40°C to +125°C
Thermal Resistance
TSOT23-5 (θ
JA
)................................................235°C/W
2x2 Thin MLF-6 (θ
JA
).........................................93°C/W
Electrical Characteristics(5)
V
IN
= V
OUT
+ 1.0V; C
OUT
= 2.2µF; I
OUT
= 100µA; T
J
= 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter Condition Min Typ Max Units
Variation from nominal V
OUT
–1 +1 % Output Voltage Accuracy Variation from nominal V
OUT
; –40°C to +125°C –2 +2
%
Line Regulation V
IN
= V
OUT
+1V to 5.5V 0.01 0.3
0.5 %/V
%/V
Load Regulation I
OUT
= 100µA to 300mA 0.5
1
1.5 %
%
Dropout Voltage
(4)
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
I
OUT
= 300mA
20
40
60
120
250
mV
mV
mV
mV
Ground Pin Current I
OUT
= 0mA to 150mA; V
IN
= 5.5V
I
OUT
= 0mA to 300mA; V
IN
= 5.5V 18
20
30 µA
µA
Ground Pin Current in Shutdown V
EN
< 0.2V; V
IN
= 5.5V 0.01 1 µA
Ripple Rejection f = 10Hz to 1kHz; C
OUT
= 2.2µF; I
OUT
= 300mA
f = 20kHz; C
OUT
= 2.2µF; I
OUT
= 300mA 62
35
dB
dB
Current Limit V
OUT
= 0V 350 500 800 mA
Thermal Shutdown 160 °C
Thermal Shutdo wn Hysteresis 20 °C
Output Voltage Noise C
OUT
= 2.2µF; 10Hz to 100kHz 80 µV
RMS
Enable Input Logic Low 0.2 V Enable Input Voltage Logic High 1.0 V
V
IL
< 0.2V 0.01 1 µA Enable Input Current V
IH
> 1.0V 0.01 1 µA
Turn-on Time
(6)
C
OUT
= 2.2µF 270 500 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 T
A
(ambient temperature) is P
D(max)
= T
J(max)
– T
A
/ θ
JA
. 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 V
EN
= 1V of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
Micrel, Inc. MIC5307
August 2007 5 M9999-082407-B
Typical Characteristics
0
2
4
6
8
10
12
14
16
18
20
22
24
26
0 50 100 150 200 250 300
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Output Current
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 2.2µF
0
2
4
6
8
10
12
14
20
22
24
26
20 40 60 80
TEMPERATURE (°C)
Ground Pin Current
vs. Temperature
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 2.2µF
100µA
300mA
16
18
0
2
4
6
8
10
12
14
16
18
20
22
24
26
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
Ground Pin Current
vs. Supply Voltage
100µA
300mA
C
OUT
= 2.2µF
V
OUT
= 2.8V
0
-10
-20
-30
-40
-50
-60
-70
-80
Power Supply
Rejection Ratio
FREQUENCY (kHz)
10.1 10 100 1,000
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
50mA
150mA
300mA
0
25
50
75
100
125
150
0 50 100 150 200 250 300
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
VOUT = 2.8V
COUT = 2.2µF
120
140
160
Dropout Volt age
vs. Temperature
20 40 60 80
TEMPERATURE (°C)
V
OUT
= 2.8V
C
OUT
= 2.2µF
100µA
50mA
100mA
150mA
300mA
0
20
40
60
80
100
2.6
2.7
2.8
2.9
3.0
0 50 100 150 200 250 300
OUTPUT CURRENT (mA)
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
Output Voltage
vs. Output Current
440
460
480
500
520
540
560
580
600
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
VOUT = 2.8V
COUT = 2.2µF
2.0
2.2
2.4
2.6
3.0
3.2
3.4
Output Voltage
vs. Temperature
20 40 60 80
TEMPERATURE (°C)
2.8
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 2.2µF
IOUT = 100µA
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
0123456
SUPPLY VOLTAGE (V)
Output Voltage
vs. Supply Voltage
100µA
300mA
COUT = 2.2µF
VOUT = 2.8V
0.001
0.01
0.1
1
10
Output Noise
Spectral Density
1
FREQUENCY (kHz)
0.10.01 10 100 1,000
V
IN
= 3.8V
V
OUT
= 2.8V
C
OUT
= 2.2µF
Micrel, Inc. MIC5307
August 2007 6 M9999-082407-B
Functional Characteristics
Enable Turn-On
Enable
(1V/div)
Output Volta
g
e
(1V/div)
Time (100µs/div)
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 2.2µF
Load Transient Response
Output Volta
g
e
(200mV/div)
Output Current
(100mA/div)
Time (10µs/div)
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 2.2µF
300mA
Line Transient Response
Input Volta
g
e
(2V/div)
Output Volta
g
e
(20mV/div)
Time (200µs/div)
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 2.2µF
5V
4V
Micrel, Inc. MIC5307
August 2007 7 M9999-082407-B
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.
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.
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:
P
D = (VIN – VOUT) IOUT + VIN IGND
Because this device is CMOS and the ground current is
typically < 50µA over the load range, the power dissipa-
tion contributed by the ground current is < 1% and can
be ignored for this calculation.
P
D = (3.8V – 2.8V) ⋅ 300mA
P
D = 0.3W
To determine the maximum ambient operating tempera-
ture of the package, use the junction-to-ambient thermal
resistance of the device and the following basic
equation:
P
D
(max) = T
J
(max) – T
A
JA
TJ(max) = 125°C, the maximum junction temperature of
the die θJA thermal resist ance = 235°C/W
Table 1 shows junction-to-ambient thermal resistance for
the MIC5307 in the TSOT23-5 package.
Package θ
θθ
θ
JA
Recommended
Minimum Footprint
TSOT23-5 235°C/W
Table 1. TSOT23-5 Th ermal 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.
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
T
A = 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
Micrel, Inc. MIC5307
August 2007 8 M9999-082407-B
Package Information
5-Pin Thin SOT23 (D5)
6-Pin 2mm x 2mm Thin MLF
®
(MT)
Micrel, Inc. MIC5307
August 2007 9 M9999-082407-B
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.
