MIC5264
150mA µCap Dual LDO Regulator
MicroLeadFrame and MLF are 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
May 2006
M9999-052406
(408) 955-1690
General Description
The MIC5264 is a dual 150mA LDO in tiny 2.5mm x
2.5mm MLF
®
packaging ideal for applications where cost
is the priority. The MIC5264 is ideal for any application in
portable electronics, including both RF and Digital
applications. With low output noise and high PSRR, the
MIC5264 is ideal for noise sensitive RF applications. While
the fast transient response and active shutdown circuitry
makes it well-suited for powering digital circuitry.
The MIC5264 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. Each
LDO is completely independent and can be powered
independently, making it easier to use in distributed power
applications.
The MIC5264 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.
• Tiny 2.5mm x 2.5mm MLF
®
package.
• Low Noise – 57µVrms.
• High PSRR – 60dB at 1kHz.
• Low dropout voltage – 210mV at 150mA.
• Stable with ceramic output capacitors.
• Independent enable pins.
• Fast transient response.
• Active shutdown on both outputs.
Applications
• Cellular Telephones
• PDAs
• GPS Receivers
Typical Application
MIC5264-xxYML
EN 2
VIN 1 OUT 1
BYP1 GND
VIN 2
EN 1
BYP2
OUT 2
Rx/Synth
Tx
RF
Transceiver
0.01µF
1µF
1µF 1µF
0.01µF
RF Power Supply
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
= 3.0V
BYP = 0.1µF
C
OUT
= 1µF
100mA 150mA
50mA
Micrel, Inc. MIC5264
May 2006
2 M9999-052406
(408) 955-1690
Ordering Information
Part Number
Full Manufacturing
Vo1/Vo2 Marking
Code
Junction Temp.
Range
Package
Pb-Free
MIC5264-2.5/1.8YML MIC5264-JGYML 2.5V/1.8V MAJG –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.6/1.8YML MIC5264-KGYML
2.6V/1.8V MAKG –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.6/2.6YML MIC5264-KKYML
2.6V/2.6V MAKK –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.8/1.5YML MIC5264-MFYML 2.8V/1.5V MAMF –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.8/2.5YML MIC5264-MJYML
2.8V/2.5V MAMJ –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.8/2.6YML MIC5264-MKYML
2.8V/2.6V MAMK –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.8/2.8YML MIC5264-MMYML 2.8V/28V MAMM –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.85/1.8YML MIC5264-NGYML 2.85V/1.8V MANG –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.85/2.85YML MIC5264-NNYML 2.85V/2.85V MANN –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.9/1.5YML MIC5264-OFYML
2.9V/1.5V MAOF –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.9/1.8YML MIC5264-OGYML
2.9V/1.8V MAOG –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-2.9/2.6YML MIC5264-OKYML
2.9V/2.6V MAOK –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-3.0/1.8YML MIC5264-PGYML 3.0V/1.8V MAPG –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-3.0/2.5YML MIC5264-PJYML 3.0V/2.5V MAPJ –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-3.0/2.8YML MIC5264-PMYML 3.0V/2.8V MAPM –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-3.0/3.0YML MIC5264-PPYML 3.0V/3.0V MAPP –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-3.3/1.8YML MIC5264-SGYML
3.3V/1.8V MASG –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-3.3/2.5YML MIC5264-SJYML 3.3V/2.5V MASJ –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-3.3/3.0YML MIC5264-SPYML
3.3V/3.0V MASP –40°C to +125°C 2.5mm x 2.5mm MLF
®
MIC5264-3.3/3.3YML MIC5264-SSYML
3.3V/3.3V MASS –40°C to +125°C 2.5mm x 2.5mm MLF
®
Note:
1. Other Voltage Combinations available. Contact Micrel for details.
Micrel, Inc. MIC5264
May 2006
3 M9999-052406
(408) 955-1690
Pin Configuration
EN2 GND25
1GND1
IN1
OUT1
BYP2
10 EN1
BYP1
OUT2
IN2
9
8
7
2
3
4
6
2.5mm × 2.5mm MLF-10L (ML)
Pin Description
Pin Number Pin Name Pin Function
1
GND1 Ground
2
IN1 Supply Voltage
3
OUT1 Regulator Output
4
BYP2 Reference Bypass: Connect external 0.01µF <= C
BYP
<=
1.0µF capacitor to
GND to reduce output noise. Do not leave open.
5
EN2 Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low
= shutdown. Do not leave open.
6
GND2 Ground
7
IN2 Supply Voltage
8
OUT2 Regulator Output
9
BYP1 Reference Bypass: Connect external 0.01µF <= C
BYP
<= 1.0µF capacitor to
GND to reduce output noise. Do not leave open.
10
EN1 Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low
= shutdown. Do not leave open.
EP
Exposed Pad Exposed Pad. Connect to external ground pins.
Micrel, Inc. MIC5264
May 2006
4 M9999-052406
(408) 955-1690
Absolute Maximum Ratings(1)
Supply Input Voltage (V
IN1/IN2
) .............................. 0V to +7V
Enable Input Voltage (V
EN1/EN2
)............................ 0V to +7V
Power Dissipation (P
D
) .......................... Internally Limited
(3)
Junction Temperature (T
J
) ...........................-40°C to 125°C
Lead Temperature (soldering, #sec.)...........-55°C to 150°C
Storage Temperature (T
s
) .......................................... 260°C
EDS Rating
(4)
................................................................. 2kV
Operating Ratings(2)
Supply Input Voltage (V
IN1/IN2
) ...................... +2.7V to +5.5V
Enable Input Voltage (V
EN1/EN2
) ............................ 0V to +V
IN
Junction Temperature (T
A
) ........................ –40°C to +125°C
Junction Thermal Resistance
MLF-10L (θ
JA
) ....................................................75°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
= 100uA -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
< 0.4V 0.2 2 µA
Ground Pin Current (Per
Regulator)
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 MIC5264x.xYML (all versions) is
75°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. MIC5264
May 2006
5 M9999-052406
(408) 955-1690
Typical Characteristics
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
= 3.0V
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
= 3.0V
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
= 3.0V
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
2.80
2.85
2.90
3.00
3.05
3.10
-40 -15 10 35 60 85 110
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
2.95
3.15
3.20
Iload = 100µA
V
OUT
= 3.0V
V
IN
= V
OUT
+ 1
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
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
= 3.0V
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
= 3.0V
V
IN
= V
OUT
+ 1
40
60
80
0
10
20
50
70
90
012345
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
30
Iload = 150µA
V
OUT
= 3.0V
V
IN
= V
OUT
+ 1
40
60
80
Micrel, Inc. MIC5264
May 2006
6 M9999-052406
(408) 955-1690
Typical Characteristics (continued)
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. MIC5264
May 2006
7 M9999-052406
(408) 955-1690
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 = 3.0V
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
= 3.0V
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
= 3.0V
V
IN
= V
OUT
+ 1V
Shutdown Dela
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 = 3.0V
VIN = VOUT + 1V
Micrel, Inc. MIC5264
May 2006
8 M9999-052406
(408) 955-1690
Block Diagram
FAULT
Reference
Voltage
Thermal
Sensor Error
Amplifier
Current
Amplifier
Startup/
Shutdown
Control
Quickstart/
Noise
Cancellation
Under-
voltage
Lockout
ACTIVE SHUTDOWN
BYP1
OUT1
GND1
EN1
IN1
FAULT
Reference
Voltage
Thermal
Sensor Error
Amplifier
Current
Amplifier
Startup/
Shutdown
Control
Quickstart/
Noise
Cancellation
Under-
voltage
Lockout
ACTIVE SHUTDOWN
BYP2
OUT2
GND2
EN2
IN2
MIC5264 Diagram
Micrel, Inc. MIC5264
May 2006
9 M9999-052406
(408) 955-1690
Application Information
Enable/Shutdown
The MIC5264 comes with two independent active-high
enable pins that allow the regulator in each output to be
disabled separately. 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 MIC5264 is a high performance, high bandwidth
device. Therefore, it requires well-bypassed input
supplies for optimal performance. A 1uF 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 MIC5264 requires capacitors at both outputs for
stability. The design requires 1uF 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 300mΩ. The output
capacitor can be increased, but performance has been
optimized for a 1uF 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 0.01uF 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 MIC5264 to drive a
large capacitor on the bypass pin without significantly
slowing turn-on time.
Active Shutdown
The MIC5264 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 MIC5264 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 MIC5264 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 V
OUT1
output voltage is 3.0V at 150mA; V
OUT2
output voltage is 2.8V at 100mA.
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 <100uA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
P
D
= (5.0V-3.0V) x 150mA + (5.0V-2.8V) x 100mA
P
D
= 0.52W
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
D
TT
P
θ
(max)
(max)
T
J(max)
= 125°C, the max. junction temperature of the die
θ
JA
thermal resistance = 63°C/W
Micrel, Inc. MIC5264
May 2006
10 M9999-052406
(408) 955-1690
MIC5264 Junction-To-Ambient Thermal Resistance
Package θ
JA
Recommended
Minimum Footprint θ
JC
2.5mm x 2.5mm
MLF-10
75°C/W 2°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
63°C/W. The maximum power dissipation must not be
exceeded for proper operation.
For example, when operating the MIC5264PMYML at an
input voltage of 5.0V at 150mA on V
OUT1
and 100mA on
V
OUT2
with a minimum footprint layout, the maximum
ambient operating temperature T
A
can be determined as
follows:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
°
−°
=CTC
W
A
63
125
52.0
T
A
= 92.24°C
Therefore, a 3.0V application at 150mA on Ch1 and 2.8V
at 100mA on Ch2 can accept an ambient operating
temperature of 92°C in a 10-pin 2.5mm x 2.5mm 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. MIC5264
May 2006
11 M9999-052406
(408) 955-1690
Package Information
10-Pin MLF (ML)
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.
