MIC5301
Single, 150mA µCap ULDO™
ULDO is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technologies, 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
November 2006
M9999-111506
General Description
The MIC5301 is a high performance, single output
ultra low LDO (ULDO™) regulator, offering low total
output noise. The MIC5301 is capable of sourcing
150mA output current and offers high PSRR and low
output noise, making it an ideal solution for RF
applications.
For battery operated applications, the MIC5301 offers
2% accuracy, extremely low dropout voltage (40mV @
150mA), and low ground current (typically 85µA total).
The MIC5301 can also be put into a zero-off-mode
current state, drawing no current when disabled.
The MIC5301 is available in the 1.6mm x 1.6mm
MLF
®
package, occupying only 2.56mm
2
of PCB area,
a 36% reduction in board area compared to SC-70
and 2mm x 2mm MLF
®
packages.
The MIC5301 has an operating junction temperature
range of –40°C to +125°C and is available in fixed and
adjustable output voltages in lead-free (RoHS
compliant) MLF
®
and Thin SOT-23-5 packages.
Data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Features
• Ultra low dropout voltage – 40mV @ 150mA
• Input voltage range: 2.3V to 5.5V
• 150mA guaranteed output current
• Stable with ceramic output capacitors
• Ultra low output noise – 30µVrms
• Low quiescent current – 85µA total
• High PSRR – up to 75dB@1kHz
• 35µs turn-on time
• High output accuracy
– ± 2% initial accuracy
– ± 3% over temperature
• Thermal shutdown and current limit protection
• Tiny 6-pin 1.6mm x 1.6mm MLF
®
leadless
package
• Thin SOT-23-5 package
Applications
• Mobile phones
• PDAs
• GPS receivers
• Portable electronics
• Digital still and video cameras
Typical Application
VOUTVIN
EN
GND
V
IN
1µF
1µF
MIC5301-x.xYML
BYP
0.01µF
Portable Application
Micrel, Inc. MIC5301
November 2006
2 M9999-111506
Ordering Information
Part number Marking
Code*
Output
Voltage**
Temperature Range Package
MIC5301-2.85YML 2JC 2.85V –40°C to +125°C 6-Pin 1.6 x 1.6 MLF
®
MIC5301YML CAA ADJ. –40°C to +125°C 6-Pin 1.6 x 1.6 MLF
®
MIC5301-2.85YD5 QC2J 2.85V –40°C to +125°C 5-Pin TSOT-23
MIC5301YD5 QCAA ADJ. –40°C to +125°C 5-Pin TSOT-23
Notes:
* Under bar / Over bar symbol may not be to scale.
** Other Voltages available. Contact Micrel for details.
Micrel, Inc. MIC5301
November 2006
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Pin Configuration
1EN
GND
IN
6 BYP
NC
OUT
5
4
2
3
1EN
GND
IN
6 BYP
ADJ
OUT
5
4
2
3
6-Pin 1.6mm x 1.6mm MLF (ML)
Fixed (Top View)
6-Pin 1.6mm x 1.6mm MLF (ML)
Adjustable (Top View)
EN GND
BYP OUT
IN
31
5
2
4
EN GND
ADJ OUT
IN
31
5
2
4
TSOT-23-5 (D5)
Fixed (Top View)
TSOT-23-5 (D5)
Adjustable (Top View)
Pin Description
Pin No.
MLF-6
Fixed
Pin No.
MLF-6
Adj.
Pin No.
TSOT-23-5
Fixed
Pin No.
TSOT-23-5
Adj.
Pin Name
Pin Function
1 1 3 3 EN
Enable Input. Active High. High = on, low = off.
Do not leave floating.
2 2 2 2 GND Ground
3 3 1 1 IN Supply Input.
4 4 5 5 OUT Output Voltage.
5 – – – NC No connection.
– 5 – 4 ADJ
Adjust Input. Connect to external resistor voltage divider
network.
6 6 4 – BYP
Reference Bypass: Connect external 0.01
µ
F to GND for
reduced Output Noise. May be left open.
HS Pad HS Pad – – E PAD Exposed Heatsink Pad connected to ground internally.
Micrel, Inc. MIC5301
November 2006
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M9999-111506
Absolute Maximum Ratings(1)
Supply Voltage (V
IN
) .....................................0V to +6V
Enable Input Voltage (V
EN
)...........................0V to +6V
Power Dissipation, Internally Limited
(3)
Lead Temperature (soldering, 3sec)..................260°C
Storage Temperature (T
S
)................ –65°C to +150°C
Operating Ratings(2)
Supply Voltage (V
IN
).............................. +2.3V to +5.5V
Enable Input Voltage (V
EN
).............................. 0V to V
IN
Junction Temperature (T
J
) ................. –40°C to +125°C
Junction Thermal Resistance
MLF-6 (θ
JA
).............................................. 100°C/W
TSOT-23-5 (θ
JA
) ...................................... 235°C/W
Electrical Characteristics(4)
V
IN
= V
OUT
+ 1.0V; C
OUT
= 1.0µF; I
OUT
= 100µA; T
J
= 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter Conditions Min Typ Max Units
Variation from nominal V
OUT
-2.0
+2.0
% Output Voltage Accuracy
Variation from nominal V
OUT
; –40°C to +125°C
-3.0
+3.0
%
Line Regulation V
IN
= V
OUT
+ 1V to 5.5V; I
OUT
= 100µA 0.02 0.3
0.6
%/V
%/V
Load Regulation I
OUT
= 100µA to 150mA 0.15
2.0
%
Dropout Voltage
(5)
I
OUT
= 100µA
I
OUT
= 100mA
I
OUT
= 150mA
0.1
25
40
75
100
mV
mV
mV
Ground Pin Current I
OUT
= 0 to 150mA 85
120
µA
Ground Pin Current in
Shutdown
V
EN
≤ 0.2V 0.01 2 µA
Ripple Rejection f = 1kHz; C
OUT
= 1.0µF; C
BYP
= 0.1µF
f = 20kHz; C
OUT
= 1.0µF; C
BYP
= 0.1µF
75
50
dB
dB
Current Limit V
OUT
= 0V 275 450
850
mA
Output Voltage Noise C
OUT
= 1.0µF; C
BYP
= 0.1µF; 10Hz to 100kHz 30 µV
RMS
Enable Input
Logic Low
0.2
V Enable Input Voltage
Logic High
1
V
V
IL
≤ 0.2V 0.01 1 µA Enable Input Current
V
IH
≥ 1.0V 0.01 1 µA
Turn-on Time
Turn-on Time C
OUT
= 1.0µF; C
BYP
= 0.1µF 35
100
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. Specification for packaged product only.
5. 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.
Micrel, Inc. MIC5301
November 2006
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Functional Diagram
VIN
EN
BYP
VOUT
GND
Current
Limit
LDO
Quick-
Start
V
REF
Thermal
Shutdown
Error
Amp
MIC5301 Block Diagram – Fixed
VIN
EN
BYP
VOUT
GND
Current
Limit
LDO
Quick-
Start
V
REF
Thermal
Shutdown
Error
Amp
ADJ
MIC5301 Block Diagram – Adjustable
Micrel, Inc. MIC5301
November 2006
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M9999-111506
Typical Characteristics
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
Power Supply
Rejection Ratio
10
FREQUENCY (kHz)
10.1 100 1,000
100µA
50mA
150mA
V
IN
= 3.85V
V
OUT
= 2.85V
C
OUT
= 1µF
C
BYP
= 0.1µF
40
45
50
55
60
Dropout Voltage
vs. Temperature
TEMPERATURE (°C)
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 1µF
150mA
100mA
50mA
25mA
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
40
45
50
0 25 50 75 100 125 150
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
V
IN
= V
OUT
+ 1V
V
OUT
= 2.85V
C
OUT
= 1µF
2.82
2.83
2.84
2.85
2.86
2.87
2.88
0 25 50 75 100 125 150
OUTPUT CURRENT (mA)
Output Voltage
vs. Output Current
V
IN
= V
OUT
+ 1V
V
OUT
= 2.85V
C
OUT
= 1µF
0
0.5
1.0
1.5
2.0
2.5
3.0
0123456
SUPPLY VOLTAGE (V)
Output Voltage
vs. Supply Voltage
100µA
150mA
V
OUT
= 2.85V
2.25
2.45
2.65
3.05
3.25
3.45
TEMPERATURE (°C)
Output Voltage
vs. Temperature
2.85
V
IN
= V
OUT
+ 1V
V
OUT
= 2.85V
C
OUT
= 1µF
I
OUT
= 100µA
0
10
20
30
40
50
60
70
80
90
100
0 25 50 75 100 125 150
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
V
IN
= V
OUT
+ 1V
V
OUT
= 2.85V
C
OUT
= 1µF
70
72
74
80
82
84
86
88
90
Ground Current
TEMPERATURE (°C)
vs. Temperature
V
IN
= V
OUT
+ 1V
V
OUT
= 2.85V
C
OUT
= 1µF
150mA
100µA
76
78
0
10
20
30
40
50
60
70
80
90
100
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
100µA
150mA
410
420
430
440
450
460
470
480
490
500
510
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
V
EN
= V
IN
C
OUT
= 1µF
0.001
0.01
0.1
1
10
Output Noise
Spectral Density
10
FREQUENCY (kHz)
10.01 100 10,0000.1 1,000
V
IN
= 4V
V
OUT
= 2.85V
C
OUT
= 1µF
C
BYP
= 0.1µF
Micrel, Inc. MIC5301
November 2006
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M9999-111506
Functional Characteristics
Enable Turn-On
Enable
(0.5V/div)
Output Volta
g
e
(1V/div)
Time (10µs/div)
V
IN
= V
OUT
+ 1V
V
OUT
= 2.85V
C
OUT
= 1µF
C
BYP
= 0.1µF
Load Transient
Output Volta
g
e
(20mV/div)
Output Current
(50mA/div)
Time (40µs/div)
V
IN
= V
OUT
+ 1V
V
OUT
= 2.85V
C
OUT
= 1µF
150mA
10mA
Line Transient
Input Volta
g
e
(2V/div)
Output Volta
g
e
(50mV/div)
Time (40µs/div)
5V
4V
V
IN
= V
OUT
+ 1V
V
OUT
= 2.85V
C
OUT
= 1µF
C
BYP
= 0.1µF
I
OUT
= 10mA
Micrel, Inc. MIC5301
November 2006
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M9999-111506
Applications Information
Enable/Shutdown
The MIC5301 comes with an active-high enable pin
that allows the regulator to be disabled. Forcing the
enable pin low disables the regulator and sends it into
a “zero” off-mode-current state. In this state, current
consumed by the regulator goes nearly to zero.
Forcing the enable pin high enables the output
voltage. The active-high enable pin uses CMOS
technology and the enable pin cannot be left floating;
a floating enable pin may cause an indeterminate
state on the output.
Input Capacitor
The MIC5301 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1µF capacitor is
required from the input to ground to provide stability.
Low-ESR ceramic capacitors provide optimal
performance at a minimum of space. Additional high-
frequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out high-
frequency noise and are good practice in any RF-
based circuit.
Output Capacitor
The MIC5301 requires an output capacitor of 1µF 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 1µF 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.
Bypass Capacitor
A capacitor can be placed from the noise bypass pin
to ground to reduce output voltage noise. The
capacitor bypasses the internal reference. A 0.1µF
capacitor is recommended for applications that require
low-noise outputs. The bypass capacitor can be
increased, further reducing noise and improving
PSRR. Turn-on time increases slightly with respect to
bypass capacitance. A unique, quick-start circuit
allows the MIC5301 to drive a large capacitor on the
bypass pin without significantly slowing turn-on time.
Refer to the Typical Characteristics section for
performance with different bypass capacitors.
No-Load Stability
Unlike many other voltage regulators, the MIC5301
will remain stable and in regulation with no load. This
is especially important in CMOS RAM keep-alive
applications.
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to
multiply the reference voltage to produce the desired
output voltage. The MIC5301 can be adjusted from
1.25V to 5.5V by using two external resistors (Figure
1). The resistors set the output voltage based on the
following equation:
⎟
⎠
⎞
⎜
⎝
⎛+= R2
R1
1VV
REFOUT
V
REF
= 1.25V
MIC5301YML
VOUTVIN
ADJEN
GND
V
IN
V
OUT
R1
1µF
R2
1µF
Figure 1. Adjustable Voltage Output
Thermal Considerations
The MIC5301 is designed to provide 150mA of
continuous current. 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 5.0V, the output voltage is
2.8V and the output current = 150mA.
The actual power dissipation of the regulator circuit
can be determined using the equation:
P
D
= (V
IN
– V
OUT
) I
OUT
+ V
IN
I
GND
Because this device is CMOS and the ground current
is typically <100µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
P
D
= (5V – 2.8V) × 150mA
P
D
= 0.33W
Micrel, Inc. MIC5301
November 2006
9 M9999-111506
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:
P
D(MAX)
=
T
J(MAX)
- T
A
JA
⎝
⎛
T
J(max)
= 125°C, the maximum junction temperature of
the die θ
JA
thermal resistance = 100°C/W.
The table below shows junction-to-ambient thermal
resistance for the MIC5301 in the 6-pin 1.6mm x
1.6mm MLF
®
package.
Package θ
JA
Recommended
Minimum Footprint
6-Pin 1.6x1.6 MLF
®
100°C/W
Thermal Resistance
Substituting P
D
for P
D(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 100°C/W.
The maximum power dissipation must not be
exceeded for proper operation.
For example, when operating the MIC5301-2.8YML at
an input voltage of 5V and 150mA load with a
minimum footprint layout, the maximum ambient
operating temperature T
A
can be determined as
follows:
0.33W = (125°C – T
A
)/(100°C/W)
T
A
=92°C
Therefore, a 2.8V application with 150mA of output
current can accept an ambient operating temperature
of 92°C in a 1.6mm x 1.6mm MLF
®
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. MIC5301
November 2006 10
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Package Information
6-Pin 1.6mm x 1.6mm MLF (ML)
5-Pin TSOT-23 (D5)
Micrel, Inc. MIC5301
November 2006 11
M9999-111506
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, Inc.
