MIC5265
150mA µCap LDO Regulator
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2007
M9999-022307
General Description
The MIC5265 is a 150mA LDO in lead-free Thin SOT-23-5
packaging ideal for applications where cost is the priority.
The MIC5265 is ideal for any application in portable
electronics, including both RF and Digital applications.
With low output noise and high PSRR, the MIC5265 is
ideal for noise sensitive applications such as RF. While the
fast transient response and active shutdown circuitry
makes it well-suited for powering digital circuitry.
The MIC5265 has a 2.7V to 5.5V input operating voltage
range, making it ideal for operation from a single cell
lithium ion battery or fixed 3.3V and 5V systems. The
MIC5265 come with an enable pin and can be put into a
zero off-mode current state.
The MIC5265 offers low dropout voltage (210mV at
150mA), low output noise (57µVrms), high PSRR and
integrates an active shutdown circuit on the output of each
regulator to discharge the output voltage when disabled.
Data sheets and supporting documentation can be found
on Micrel’s web site at: www.micrel.com
Features
• 2.7V to 5.5V supply voltage.
• Low 75µA quiescent current per LDO.
• Thin SOT-23-5 package.
• Low Noise – 57µVrms.
• High PSRR – 60dB at 1kHz.
• Low dropout voltage – 210mV at 150mA.
• Stable with ceramic output capacitors.
• Fast transient response.
• Active shutdown.
Applications
• Cellular Telephones
• PDAs
• GPS Receivers
____________________________________________________________________________________________________________
Typical Application
MIC5265-xxYD5
VIN VOUT
BYP GND
EN
Rx/Synth
RF Receiver
0.01µF
1µF
1µF
0
-20
-40
-50
-60
-70
0.01 0.1 1 10 100 1000
FREQUENCY (kHz)
Power Supply
Rejection Ratio
-30
V
IN
= V
OUT
+ 1V
V
OUT
= 3.1V
BYP = 0.01µF
C
OUT
= 1µF
100mA
150mA
50mA
RF Power Supply
Micrel, Inc. MIC5265
February 2007 2 M9999-022307
Ordering Information
Part Number Output
Voltage Marking
Code Junction Temp. Range Package
MIC5265-1.5YD5 1.5V N715 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-1.8YD5 1.8V N718 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-1.85YD5 1.85V N71J –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-2.5YD5 2.5V N725 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-2.6YD5 2.6V N726 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-2.7YD5 2.7V N727 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-2.8YD5 2.8V N728 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-2.85YD5 2.85V N72J –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-2.9YD5 2.9V N729 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-3.0YD5 3.0V N730 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-3.1YD5 3.1V N731 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-3.2YD5 3.2V N732 –40°C to +125°C Pb-Free Thin SOT-23-5
MIC5265-3.3YD5 3.3V N733 –40°C to +125°C Pb-Free Thin SOT-23-5
Note:
1. Other Voltage Combinations available. Contact Micrel, Inc. for details.
Micrel, Inc. MIC5265
February 2007 3 M9999-022307
Pin Configur ation
EN GND
BYP OUT
VIN
31
5
2
4
Lead-Free Thin SOT-23-5 (M5)
Pin Description
Pin Number Pin Name Pin Function
1 IN Supply Voltage
2 GND Ground
3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
4 BYP Reference Bypass: Connect external 0.01µF <= C
BYP
<= 1.0µF capacitor to
GND to reduce output noise. May be left open.
5 OUT Regulator Output
Micrel, Inc. MIC5265
February 2007 4 M9999-022307
Absolute Maximum Ratings(1)
Supply Input Voltage (V
IN
).................................... 0V to +7V
Enable Input Voltage (V
EN1
) ................................. 0V to +7V
Power Dissipation (P
D
) .......................... Internally Limited
(3)
Junction Temperature (T
J
) ...........................-40°C to 125°C
Lead Temperature (soldering, #sec.)......................... 260°C
Storage Temperature (T
s
) ............................-55°C to 150°C
EDS Rating
(4)
................................................................. 2kV
Operating Ratings(2)
Supply Input Voltage (V
IN
)............................ +2.7V to +5.5V
Enable Input Voltage (V
EN
)................................... 0V to +V
IN
Junction Temperature (T
A
) ........................–40°C to +125°C
Junction Thermal Resistance
Thin SOT-23-5 (θ
JA
).........................................235°C/W
Electrical Characteristics(5)
V
EN
= V
IN
= V
OUT
+ 1V; I
L
=100µA; C
L
= 1.0µF; C
BYP
= 0.01µF per output; T
A
= 25°C, bold values indicate –40°C< T
A
<
+85°C; unless noted.
Parameter Condition Min Typ Max Units
Output Voltage Accuracy I
OUT
= 100µA -2
-3 2
3 %
%
Line Regulation V
IN
= V
OUT
+1V to 5.5V 0.05 0.2 %
Load Regulation I
OUT
= 0.1mA to 150mA 2 3 %
Dropout Voltage I
OUT
= 50mA
I
OUT
= 150mA 75
210
500 mV
mV
Quiescent Current V
EN
< 0.2V 0.2 2 µA
Ground Pin Current I
OUT
= 0mA
I
OUT
= 150mA 75
80 120
150 µA
µA
PSRR (Ripple Rejection) f = 100Hz, C
BYP
= 0.1µF, I
LOAD
– 50mA
f = 1kHz, C
BYP
= 0.1µF, I
LOAD
– 50mA
f = 10kHz, C
BYP
= 0.1µF, I
LOAD
– 50mA 62
64
64 dB
dB
dB
Current Limit V
OUT
= 0V 225 mA
Output Noise C
OUT
= 1.0µF, C
BYP
= 0.1µF, f = 10Hz to
100kHz 57 µV
(rms)
Enable Input (EN1 and EN2)
Enable Input Logic Low V
IN
= 2.7V to 5.5V, regulator shutdown 0.2
V
Enable Input Logic High V
IN
= 2.7V to 5.5V, regulator enabled 1.6
V
Enable Input Current V
IL
< 0.4V, regulator shutdown
V
IH
> 1.6V, regulator enabled 0.01
0.01 µA
µA
Thermal Shutdown
Thermal Shutdown Temperature 150 °C
Hysteresis 10 °C
Turn-on/Turn-off Characteristics
Turn-on Time 40 150 µs
Discharge Resistance 500 Ω
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. The θ
JA
of the MIC5265x.xYD5 (all
versions) is 235°C/W on a PC board (see ”Thermal Considerations” section for further details).
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
5. Specification for packaged product only.
Micrel, Inc. MIC5265
February 2007 5 M9999-022307
Typical Characteristics
0
-20
-40
-50
-60
-70
0.01 0.1 1 10 100 1000
FREQUENCY (kHz)
Power Supply
Rejection Ratio
-30
V
IN
= V
OUT
+ 1V
V
OUT
= 3.1V
BYP = 0.01µF
C
OUT
= 1µF
100mA
150mA
50mA
0
-10
-20
-40
-50
-60
-70
0.01 0.1 1 10 100 1000
FREQUENCY (kHz)
Power Supply
Rejection Ratio
-30
-80
V
IN
= V
OUT
+ 1V
V
OUT
= 3.1V
BYP = 0.1µF
C
OUT
= 1µF
100mA
150mA
50mA
10 100 1000 10000 100000 1000000
0
-10
-20
-40
-50
-60
-70
0.01 0.1 1 10 100 1000
FREQUENCY (kHz)
Power Supply
Rejection Ratio
-30
V
IN
= V
OUT
+ 1V
V
OUT
= 3.1V
BYP = 1µF
C
OUT
= 1µF
100mA
150mA
50mA
0.00
0.05
0.10
0.20
0.25
0.30
0 25 50 75 100 125 150
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
0.15
125°C
25°C
-40°C
0.00
0.05
0.10
0.20
0.25
0.30
-40 -15 10 35 60 85 110
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
0.15
150mA
50mA
100mA
10mA 1mA
2.90
2.95
3.00
3.10
3.15
3.20
-40 -15 10 35 60 85 110
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
3.05
Iload = 100µA
V
OUT
= 3.1V
V
IN
= V
OUT
+ 1
3.25
3.30
0
0.5
1
2
2.5
3
0 1 2 3 4 5
INPUT VOLTAGE(V)
Output Voltage
vs. Input Voltage
1.5
100µA Load
150µA Load
2.5
2.6
2.7
2.8
2.9
3.0
TEMPERATURE (°C)
Output Voltage
vs. Temper ature
V
IN
= 3.8V
V
OUT
= 2.8V
C
OUT
= 1µF
I
OUT
= 100µA
72
73
74
75
76
77
78
79
80
81
82
83
0 30 60 90 120 150
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Output Current
V
IN
= V
OUT
+ 1V
V
OUT
= 3.1V
68
70
72
76
78
-40 -10 20 50 80 110
TEMPERATURE (°C)
Ground Pin Current
vs. Temperature
74
Iload = 100µA
60
65
70
80
90
-40 -10 20 50 80 110
TEMPERATURE (°C)
Ground Pin Current
vs. Temperature
75
Iload = 150mA
85
95
0
10
20
50
70
90
012345
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
30
Iload = 100µA
V
OUT
= 3.1V
V
IN
= V
OUT
+ 1
40
60
80
Micrel, Inc. MIC5265
February 2007 6 M9999-022307
Typical Characteristics (continued)
0
10
20
50
70
90
012345
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
30
Iload = 150µA
V
OUT
= 3.1V
V
IN
= V
OUT
+ 1
40
60
80
150
170
190
230
270
290
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Short Circuit Current
vs. Input Voltage
210
250
10 100 1000 10000 100000 1000000 10000000
0.001
0.01
0.1
1
10
0.01 0.1 1 10 100 1000 10000
FREQUENCY (kHz)
Output Noise
Spectral Density
V
IN
= 4.2V
V
OUT
= 2.8V
C
OUT
= 1.0µF
BYP = 0.1µF
I
OUT
= 150mA
Micrel, Inc. MIC5265
February 2007 7 M9999-022307
Functional Characteristics
Line Transient Response
Inpu
t
Volta
g
e
(1V/div)
Outpu
t
Volta
g
e
(20mV/div)
Time (400µs/div)
5.0V
4.0V
COUT = 1µF Ceramic
CBYP = 0.01µF
IOUT = 150mA
VOUT = 3.1V
VIN = VOUT + 1V
Load Transient Response
Output Voltage
(50mV/div)
Output Curren
t
(50mA/div)
Time (5µs/div)
150mA
100µA C
OUT
= 1µF Ceramic
C
BYP
= 0.01µF
V
OUT
= 3.1V
V
IN
= V
OUT
+ 1V
Enable Pin Dela
y
Outpu
t
Volta
g
e
(1V/div)
Enable Volta
g
e
(1V/div)
Time (10µs/div)
C
IN
= 1µF Ceramic
C
BYP
= 0.01µF
I
OUT
= 10mA
V
OUT
= 3.1V
V
IN
= V
OUT
+ 1V
Shutdown De la
y
Output Volta
g
e
(1V/div)
Enable Volta
g
e
(1V/div)
Time (100µs/div)
CIN = 1µF Ceramic
COUT = 1µF Ceramic
IOUT = 10mA
VOUT = 3.1V
VIN = VOUT + 1V
Micrel, Inc. MIC5265
February 2007 8 M9999-022307
Block Diagram
FAULT
Reference
Voltage
Thermal
Sensor Error
Amplifier
Current
Amplifier
Startup/
Shutdown
Control
Quickstart/
Noise
Cancellation
Under-
voltage
Lockout
ACTIVE SHUTDOWN
BYP
OUT
GND
EN
IN
MIC5265 Diagram
Micrel, Inc. MIC5265
February 2007 9 M9999-022307
Applications Information
Enable/Shutdown
The MIC5265 comes with an active-high enable pin that
allows the regulator in each output 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.
This part is CMOS and the enable pin cannot be left
floating; a floating enable pin may cause an
indeterminate state on the output.
Input Capacitor
The MIC5265 is a high performance, high bandwidth
device. Therefore, it requires well-bypassed input
supplies 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 MIC5265 requires an output capacitor for stability.
The design requires 1µF or greater on each output to
maintain stability. The design is optimized for use with
low-ESR ceramic chip capacitors. High ESR capacitors
may cause high frequency oscillation. The maximum
recommended ESR is 300m
Ω
. 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. X7Rtype 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 0.01µF 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 MIC5265 to drive a
large capacitor on the bypass pin without significantly
slowing turn-on time.
Active Shutdown
The MIC5265 also features an active shutdown clamp,
which is an N-channel MOSFET that turns on when the
device is disabled. This allows the output capacitor and
load to discharge, de-energizing the load.
No-Load Stability
The MIC5265 will remain stable and in regulation with no
load unlike many other voltage regulators. This is
especially important in CMOS RAM keep-alive
applications.
Thermal Considerations
The MIC5265 is designed to provide 150mA of
continuous current per output 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
5.0V, the output voltage is 2.8V, and the output current
is 100mA.
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 <100µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
PD = (5.0V – 2.8V) x 150mA
PD = 0.33W
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:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−
=JA
AJ
DTT
P
θ
(max)
(max)
TJ(max) = 125°C, the max. junction temperature of the
die θJA thermal resistance = 235°C/W
Micrel, Inc. MIC5265
February 2007 10 M9999-022307
MIC5265 Junction-To-Ambient Thermal Resistance
Package θ
JA
Recommended
Minimum Footprint θ
JA
1” Sq.
Copper Clad θ
JC
SOT-23-5
(M5 or D5)
235°C/W 125°C 145°C/W
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
235C/W. The maximum power dissipation must not be
exceeded for proper operation.
For example, when operating the MIC5265-2.8YD5 at an
input voltage of 5.0V at 150mA with a minimum footprint
layout, the maximum ambient operating temperature TA
can be determined as follows:
WC TC
W
A
/235
125
33.0 °
−°
=
TA = 47.45°C
Therefore, a 2.8V application at 150mA of output current
can accept an ambient operating temperature of 47°C in
a SOT-23-5 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. MIC5265
February 2007 11 M9999-022307
Package Information
Thin SOT-23-5 (M5)
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, Incorporated.
