MICREL MIC23030-AYMT

MIC23030
8MHz PWM 400mA Buck Regulator with
HyperLight Load™
General Description
Features
The MIC23030 is a high efficiency 8MHz 400mA
synchronous buck regulator with HyperLight Load™ mode.
HyperLight Load™ provides very high efficiency at light
loads and ultra-fast transient response which is perfectly
suited for supplying processor core voltages.
An
additional benefit of this proprietary architecture is very low
output ripple voltage throughout the entire load range with
the use of small output capacitors. The tiny 1.6mm x
1.6mm Thin MLF® package saves precious board space
and requires only three external components.
The MIC23030 is designed for use with a very small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2 µF that enables a sub-1mm height.
The MIC23030 has a very low quiescent current of 21µA
and achieves as high as 83% efficiency at 1mA. At higher
loads, the MIC23030 provides a constant switching
frequency around 8MHz while achieving peak efficiencies
up to 91%.
The MIC23030 is available in a 6-pin 1.6mm x 1.6mm Thin
MLF® package with an operating junction temperature
range from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
•
•
•
•
•
•
•
•
•
•
•
•
•
Input voltage: 2.7V to 5.5V
HyperLight Load™
400mA output current
Up to 91% efficiency and 83% at 1mA
21µA typical quiescent current
8MHz PWM operation in continuous mode
Ultra fast transient response
Low voltage output ripple
− 14mVpp ripple in HyperLight Load™ mode
− 5mV output voltage ripple in full PWM mode
Fully integrated MOSFET switches
0.01µA shutdown current
Thermal shutdown and current limit protection
Fixed and adjustable output voltage options available
6-pin 1.6mm x 1.6mm Thin MLF®
–40°C to +125°C junction temperature range
Applications
• Mobile handsets
• Portable media/MP3 players
• Portable navigation devices (GPS)
• WiFi/WiMax/WiBro modules
• Digital Cameras
• Wireless LAN cards
• USB powered devices
• Portable applications
____________________________________________________________________________________________________________
Typical Application
1
VIN
SW
EN
SNS
L1
C1
EN
4
AGND
GND
5
VOUT
2
3
C2
PGND
6
VIN = 3.0V
90
EFFICIENCY (%)
VIN
2.7V to 5.5V
Efficiency VOUT = 2.5V
100
U1 MIC23030
VIN = 3.6V
80
70
VIN = 4.2V
L = 0.47µH
COUT = 4.7µF
60
GND
50
1
10
100
1000
OUTPUT CURRENT (mA)
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademark 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 2008
M9999-082608-B
Micrel Inc.
MIC23030
Ordering Information
Part Number
Marking
Code
Nominal Output
Voltage
Junction
Temp. Range
Package
Lead Finish
MIC23030-AYMT
GDA
ADJ
–40°C to +125°C
6-Pin 1.6mm x 1.6mm Thin MLF®
Pb-Free
MIC23030-GYMT*
GDG
1.8V
–40°C to +125°C
6-Pin 1.6mm x 1.6mm Thin MLF®
Pb-Free
–40°C to +125°C
6-Pin 1.6mm x 1.6mm Thin MLF
®
Pb-Free
6-Pin 1.6mm x 1.6mm Thin MLF
®
Pb-Free
6-Pin 1.6mm x 1.6mm Thin MLF
®
Pb-Free
MIC23030-FYMT*
GDF
MIC23030-4YMT
1.5V
GD4
MIC23030-CYMT*
1.2V
GDC
1.0V
–40°C to +125°C
–40°C to +125°C
Notes:
1. Other options available. Contact Micrel for details.
®
2. Thin MLF is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
*
Available August 2008.
Pin Configuration
VIN
1
6
PGND
VIN
1
6
GND
SW
2
5
AGND
SW
2
5
FB
SNS
3
4
EN
SNS
3
4
EN
1.6 x 1.6mm Thin MLF® (MT)
Fixed (Top View)
1.6 x 1.6mm Thin MLF® (MT)
Adjustable (Top View)
Pin Description
Fixed Option
ADJ Option
Pin Name
1
1
VIN
Input Voltage: Connect a capacitor to ground to decouple the noise.
2
2
SW
Switch (Output): Internal power MOSFET output switches.
3
3
SNS
Sense: Connect to VOUT as close to output capacitor as possible to sense
output voltage.
4
4
EN
Enable (Input): Logic high enables operation of the regulator. Logic low
will shut down the device. Do not leave floating.
5
-
AGND
Analog Ground: Connect to central ground point where all high current
paths meet (CIN, COUT, PGND) for best operation.
-
5
FB
Feedback (Input): Connect resistor divider at this node to set output
voltage. Resistors should be selected based on a nominal VFB of 0.62V.
6
-
PGND
-
6
GND
E-PAD
E-PAD
HS PAD
August 2008
Pin Function
Power Ground.
Ground.
Connect to PGND or GND.
2
M9999-082608-B
Micrel Inc.
MIC23030
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) . ……………………………………….6V
Sense (VSNS).. ..................................................................6V
Output Switch Voltage ..................................................6V
Enable Input Voltage (VEN).. ..............................-0.3V to VIN
Storage Temperature Range .. ……………-65°C to +150°C
ESD Rating(3) ................................................. ESD Sensitive
Supply Voltage (VIN)... …………………………..2.7V to 5.5V
Enable Input Voltage (VEN) .. ……………………….0V to VIN
Output Voltage Range (VSNS) ………………….0.7V to 3.6V
Junction Temperature Range (TJ)... ….-40°C ≤ TJ ≤ +125°C
Thermal Resistance
1.6mm x 1.6mm Thin MLF-6 (θJA) ..................92.4°C/W
Electrical Characteristics(4)
TA = 25°C; VIN = VEN = 3.6V; L = 1.0µH; COUT = 4.7µF unless otherwise specified.
Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Parameter
Condition
Min
Under-Voltage Lockout Threshold
(turn-on)
2.45
Quiescent Current
IOUT = 0mA , SNS > 1.2 * VOUT Nominal
Shutdown Current
VEN = 0V; VIN = 5.5V
Supply Voltage Range
Output Voltage Accuracy
Typ
Max
Units
5.5
V
2.55
2.65
V
21
35
µA
0.01
4
µA
+2.5
%
2.7
VIN = 3.6V; ILOAD = 20mA
-2.5
Feedback Voltage
Adjustable Option Only
Current Limit
SNS = 0.9*VOUTNOM
Output Voltage Line Regulation
VIN = 3.0V to 5.5V, VOUT = 1.2V, ILOAD = 20mA,
0.3
%/V
Output Voltage Load Regulation
20mA < ILOAD < 400mA, VOUT = 1.2V,
VIN = 3.6V
0.7
%
ISW = 100mA PMOS
0.65
ISW = -100mA NMOS
0.8
PWM Switch ON-Resistance
Maximum Frequency
IOUT = 120mA
SoftStart Time
VOUT = 90%
0.62
0.41
Enable Threshold
0.7
V
1
A
Ω
8
MHz
100
µs
0.9
1.2
V
Enable Input Current
0.1
2
µA
Over-temperature Shutdown
160
°C
Over-temperature Shutdown Hysteresis
20
°C
0.5
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
August 2008
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Micrel Inc.
MIC23030
Typical Characteristics
SW Frequency
vs. Inductance
L = 2.2µH
1
L = 1µH
0.1
L = 0.47µH
0.01
1
August 2008
VIN = 3.6V
VOUT = 1.8V
COUT = 4.7µF
10
100
1000
OUTPUT CURRENT (mA)
1
VIN = 3.0V
VIN = 3.6V
0.1
0.01
VOUT = 1.8V
L = 0.47µH
COUT = 4.7µF
VIN = 4.2V
1
10
100
1000
OUTPUT CURRENT (mA)
4
8.5
8.0
7.5
120
80
100
6.0
60
L = 0.47µH
COUT = 4.7µF
Load = 120mA
7.0
6.5
TEMPERATURE (°C)
SW Frequency
vs. Output Current
10
5.7
9.0
40
L = 0.47µH
COUT = 4.7µF
Load = 120mA
8MHz
SW FREQUENCY (MHz)
SW FREQUENCY (MHz)
1.2
1.18
TEMPERATURE (°C)
8MHz
0.001
VOUT = 1.2V
1.22
1.14
1.12
VOUT = 1.2V
L = 0.47µH
COUT = 4.7µF
9.5
1.24
1.16
50mA
Frequency
vs. Temperature
10.0
1.28
1.26
1.10
10
100
1000
OUTPUT CURRENT (mA)
10
Output Voltage
vs. Temperature
1.30
1mA
3.2 3.7 4.2 4.7 5.2
INPUT VOLTAGE (V)
20
1
5.7
0
1.12
1.10
VOUT = 1.2V
L = 0.47µH
COUT = 4.7µF
3.2 3.7 4.2 4.7 5.2
INPUT VOLTAGE (V)
1.14
1.12
1.1
2.7
-20
1.16
1.14
VIN = 3.0V
Not switching
L = open
VOUT = 1.2*Vnom
5
10
100
1000
OUTPUT CURRENT (mA)
Output Voltage
vs. Input Voltage
-40
1.2
1.18
VIN = 3.6V
15
ENABLE THRESHOLD (V)
VIN = 4.2V
20
-40
1.26
1.24
1.22
25
10
1
1.28
1.26
1.24 150mA
10mA
1.22
1.2
1.18
400mA
1.16 300mA
FREQUENCY (MHz)
Output Voltage
vs. Output Current
1.30
1.28
30
L = 0.47µH
COUT = 4.7µF
VIN = 3.6V
1.3
35
0
2.7
10
100
1000
OUTPUT CURRENT (mA)
50
120
1
VIN = 3.6V
COUT = 4.7µF
VIN = 4.2V
60
100
L = 2.2µH
70
Quiescent Current
vs. Input Voltage
80
L = 0.47µH
70
VIN = 3.0V
80
10
100
1000
OUTPUT CURRENT (mA)
60
80
1
40
QUIESCENT CURRENT (µA)
EFFICIENCY (%)
L = 1.0µH
60
OUTPUT VOLTAGE (V)
50
10
100
1000
OUTPUT CURRENT (mA)
90
50
60
Efficiency
with Various Inductors
100
L = 0.47µH
COUT = 4.7µF
40
1
VIN = 3.6V
0
60
VIN = 4.2V
70
VIN = 2.7V
90
80
20
L = 0.47µH
COUT = 4.7µF
VIN = 2.7V
VIN = 3.0V
-20
VIN = 4.2V
EFFICIENCY (%)
70
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
VIN = 3.6V
80
50
90
Efficiency VOUT = 1.2V
100
EFFICIENCY (%)
VIN = 3.0V
90
Efficiency VOUT = 1.8V
100
OUTPUT VOLTAGE (V)
Efficiency VOUT = 2.5V
100
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2.7
Enable Threshold
vs. Input Voltage
Enable On
3.2 3.7 4.2 4.7 5.2
INPUT VOLTAGE (V)
5.7
M9999-082608-B
Micrel Inc.
MIC23030
Typical Characteristics (continued)
Enable Threshold
vs. Temperature
900
VIN = 3.6V
0.8
800
Enable On
CURRENT LIMIT (mA)
1.0
VIN = 2.7V
VIN = 5.5V
0.6
0.4
TEMPERATURE (°C)
August 2008
700
600
500
400
300
200
100
120
100
80
60
0
-40
0
20
0.2
40
L = 0.47µH
COUT = 4.7µF
-20
ENABLE THRESHOLD (V)
1.2
Current Limit
vs. Input Voltage
0
2.7
3.2 3.7 4.2 4.7 5.2
INPUT VOLTAGE (V)
5
5.7
M9999-082608-B
Micrel Inc.
MIC23030
Functional Characteristics
August 2008
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Micrel Inc.
MIC23030
Functional Characteristics (continued)
August 2008
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Micrel Inc.
MIC23030
Functional Characteristics (continued)
August 2008
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MIC23030
Functional Diagram
VIN
EN
CONTROL
LOGIC
Timer &
Softstart
UVLO
Gate
Drive
Reference
SW
Current
Limit
ERROR
COMPARATOR
ZERO 1
ISENSE
PGND
SNS
AGND
Simplified MIC23030 Fixed Functional Block Diagram
VIN
EN
CONTROL
LOGIC
Timer &
Softstart
UVLO
Gate
Drive
Reference
SW
Current
Limit
ZERO 1
ERROR
COMPARATOR
ISENSE
SNS
FB
GND
Simplified MIC23030 Adjustable Functional Block Diagram
August 2008
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MIC23030
FB (Adjustable Output Only)
The feedback pin (FB) allows the regulated output
voltage to be set by applying an external resistor
network. The internal reference voltage is 0.62V and the
recommended value of R2 is 200kΩ. The output voltage
is calculated from the equation below:
Functional Description
VIN
The input supply (VIN) provides power to the internal
MOSFETs for the switch mode regulator along with the
internal control circuitry. The VIN operating range is 2.7V
to 5.5V so an input capacitor, with a minimum voltage
rating of 6.3V, is recommended. Due to the high
switching speed, a minimum 2.2µF bypass capacitor
placed close to VIN and the power ground (PGND) pin is
required. Refer to the layout recommendations for
details.
⎛ R1
⎞
VOUT = 0.62V ⎜
+ 1⎟
⎝ 200kΩ
⎠
U1 MIC23030
VIN
EN
A logic high signal on the enable pin activates the output
voltage of the device. A logic low signal on the enable
pin deactivates the output and reduces supply current to
0.01µA. MIC23030 features built-in soft-start circuitry
that reduces in-rush current and prevents the output
voltage from overshooting at start up. Do not leave
floating.
1
VIN
SW
2
SNS
3
FB
5
L1
C1
4.7µF
EN
4
EN
GND
GND
SW
The switch (SW) connects directly to one end of the
inductor and provides the current path during switching
cycles. The other end of the inductor is connected to the
load, SNS pin and output capacitor. Due to the high
speed switching on this pin, the switch node should be
routed away from sensitive nodes whenever possible.
6
VOUT
R1
383k
R2
200k
C2
4.7µF
GND
Figure 1. MIC23030-AYMT Schematic
PGND / GND
The power ground pin is the ground path for the high
current in PWM mode. The current loop for the power
ground should be as small as possible and separate
from the analog ground (AGND) loop as applicable.
Refer to the layout recommendations for more details.
SNS
The sense (SNS) pin is connected to the output of the
device to provide feedback to the control circuitry. The
SNS connection should be placed close to the output
capacitor. Refer to the layout recommendations for more
details.
AGND (Fixed Output Only)
The analog ground (AGND) is the ground path for the
biasing and control circuitry. The current loop for the
signal ground should be separate from the power ground
(PGND) loop. Refer to the layout recommendations for
more details.
August 2008
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Micrel Inc.
MIC23030
in inductance. Ensure the inductor selected can handle
the maximum operating current. When saturation current
is specified, make sure that there is enough margin so
that the peak current does not cause the inductor to
saturate. Peak current can be calculated as follows:
Application Information
The MIC23030 is a high performance DC/DC step down
regulator offering a small solution size. Supporting an
output current up to 400mA inside a tiny 1.6mm x 1.6mm
Thin MLF® package and requiring only three external
components, the MIC23030 meets today’s miniature
portable electronic device needs. Using the HyperLight
Load™ switching scheme, the MIC23030 is able to
maintain high efficiency throughout the entire load range
while providing ultra-fast load transient response. The
following sections provide additional device application
information.
⎡
⎛ 1 − VOUT /VIN ⎞⎤
I PEAK = ⎢IOUT + VOUT ⎜
⎟⎥
⎝ 2 × f × L ⎠⎦
⎣
As shown by the calculation above, the peak inductor
current is inversely proportional to the switching
frequency and the inductance; the lower the switching
frequency or the inductance the higher the peak current.
As input voltage increases, the peak current also
increases.
The size of the inductor depends on the requirements of
the application. Refer to the Typical Application Circuit
and Bill of Materials for details.
DC resistance (DCR) is also important. While DCR is
inversely proportional to size, DCR can represent a
significant efficiency loss. Refer to the Efficiency
Considerations.
Input Capacitor
A 2.2µF ceramic capacitor or greater should be placed
close to the VIN pin and PGND / GND pin for bypassing.
A TDK C1608X5R0J475K, size 0603, 4.7µF ceramic
capacitor is recommended based upon performance,
size and cost. A X5R or X7R temperature rating is
recommended for the input capacitor. Y5V temperature
rating capacitors, aside from losing most of their
capacitance over temperature, can also become
resistive at high frequencies. This reduces their ability to
filter out high frequency noise.
Compensation
The MIC23030 is designed to be stable with a 0.47µH to
2.2µH inductor with a minimum of 2.2µF ceramic (X5R)
output capacitor.
Output Capacitor
The MIC23030 was designed for use with a 2.2µF or
greater ceramic output capacitor. Increasing the output
capacitance will lower output ripple and improve load
transient response but could increase solution size or
cost. A low equivalent series resistance (ESR) ceramic
output capacitor such as the TDK C1608X5R0J475K,
size 0603, 4.7µF ceramic capacitor is recommended
based upon performance, size and cost. Both the X7R or
X5R temperature rating capacitors are recommended.
The Y5V and Z5U temperature rating capacitors are not
recommended due to their wide variation in capacitance
over temperature and increased resistance at high
frequencies.
Duty Cycle
The typical maximum duty cycle of the MIC23030 is
80%.
Efficiency Considerations
Efficiency is defined as the amount of useful output
power, divided by the amount of power supplied.
⎛V
×I
Efficiency % = ⎜⎜ OUT OUT
⎝ VIN × IIN
Maintaining high efficiency serves two purposes. It
reduces power dissipation in the power supply, reducing
the need for heat sinks and thermal design
considerations and it reduces consumption of current for
battery powered applications. Reduced current draw
from a battery increases the devices operating time and
is critical in hand held devices.
There are two types of losses in switching converters;
DC losses and switching losses. DC losses are simply
the power dissipation of I2R. Power is dissipated in the
high side switch during the on cycle. Power loss is equal
to the high side MOSFET RDSON multiplied by the Switch
Current squared. During the off cycle, the low side Nchannel MOSFET conducts, also dissipating power.
Device operating current also reduces efficiency. The
product of the quiescent (operating) current and the
supply voltage represents another DC loss. The current
required driving the gates on and off at a constant 8MHz
frequency and the switching transitions make up the
switching losses.
Inductor Selection
When selecting an inductor, it is important to consider
the following factors (not necessarily in the order of
importance):
•
Inductance
•
Rated current value
•
Size requirements
•
DC resistance (DCR)
The MIC23030 was designed for use with a 0.47µH to
2.2µH inductor. For faster transient response, a 0.47µH
inductor will yield the best result. For lower output ripple,
a 2.2µH inductor is recommended.
Maximum current ratings of the inductor are generally
given in two methods; permissible DC current and
saturation current. Permissible DC current can be rated
either for a 40°C temperature rise or a 10% to 20% loss
August 2008
⎞
⎟ × 100
⎟
⎠
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Micrel Inc.
MIC23030
off-time until the output drops below the threshold. The
NMOS acts as an ideal rectifier that conducts when the
PMOS is off. Using a NMOS switch instead of a diode
allows for lower voltage drop across the switching device
when it is on. The asynchronous switching combination
between the PMOS and the NMOS allows the control
loop to work in discontinuous mode for light load
operations. In discontinuous mode, the MIC23030 works
in pulse frequency modulation (PFM) to regulate the
output. As the output current increases, the off-time
decreases, thus provides more energy to the output.
This switching scheme improves the efficiency of
MIC23030 during light load currents by only switching
when it is needed. As the load current increases, the
MIC23030 goes into continuous conduction mode (CCM)
and switches at a frequency centered at 8MHz. The
equation to calculate the load when the MIC23030 goes
into continuous conduction mode may be approximated
by the following formula:
Figure 2. Efficiency Under Load
The figure above shows an efficiency curve. From no
load to 100mA, efficiency losses are dominated by
quiescent current losses, gate drive and transition
losses. By using the HyperLight Load™ mode, the
MIC23030 is able to maintain high efficiency at low
output currents.
Over 100mA, efficiency loss is dominated by MOSFET
RDSON and inductor losses. Higher input supply voltages
will increase the Gate-to-Source threshold on the
internal MOSFETs, thereby reducing the internal RDSON.
This improves efficiency by reducing DC losses in the
device. All but the inductor losses are inherent to the
device. In which case, inductor selection becomes
increasingly critical in efficiency calculations. As the
inductors are reduced in size, the DC resistance (DCR)
can become quite significant. The DCR losses can be
calculated as follows:
⎛ (V − VOUT ) × D ⎞
⎟⎟
I LOAD > ⎜⎜ IN
2L × f
⎠
⎝
As shown in the previous equation, the load at which
MIC23030 transitions from HyperLight Load™ mode to
PWM mode is a function of the input voltage (VIN), output
voltage (VOUT), duty cycle (D), inductance (L) and
frequency (f). This is illustrated in the graph below. Since
the inductance range of MIC23030 is from 0.47µH to
2.2µH, the device may then be tailored to enter
HyperLight Load™ mode or PWM mode at a specific
load current by selecting the appropriate inductance. For
example, in the graph below, when the inductance is
2.2µH the MIC23030 will transition into PWM mode at a
load of approximately 30mA. Under the same condition,
when the inductance is 0.47µH, the MIC23030 will
transition into PWM mode at approximately 120mA.
PDCR = IOUT2 x DCR
From that, the loss in efficiency due to inductor
resistance can be calculated as follows:
⎡ ⎛
VOUT × IOUT
Efficiency Loss = ⎢1 − ⎜⎜
V
⎣⎢ ⎝ OUT × IOUT + PDCR
⎞⎤
⎟⎥ × 100
⎟
⎠⎦⎥
Efficiency loss due to DCR is minimal at light loads and
gains significance as the load is increased. Inductor
selection becomes a trade-off between efficiency and
size in this case.
HyperLight Load™ Mode
MIC23030 uses a minimum on and off time proprietary
control loop (patented by Micrel). When the output
voltage falls below the regulation threshold, the error
comparator begins a switching cycle that turns the
PMOS on and keeps it on for the duration of the
minimum-on-time. This increases the output voltage. If
the output voltage is over the regulation threshold, then
the error comparator turns the PMOS off for a minimum-
August 2008
Figure 3. SW Frequency vs. Inductance
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Micrel Inc.
MIC23030
MIC23030 Typical Application Circuit (Fixed)
U1 MIC23030
J1
VIN
2.7 to 5.5V
J5
EN
SW
VIN
C1
J3
VOUT
L1
C2
SNS
EN
AGND
PGND
J2
GND
J4
GND
Bill of Materials
Item
C1, C2
L1
Part Number
C1608X5R0J475K
(1)
TDK
Description
Murata
0.47µH, 0.9A, 90mΩ, L2mm x W1.25mm x H0.5mm
LQH32CNR47M33
Murata(2)
0.47µH, 1.1A, 42mΩ, L3.2mm x W2.5mm x H2.0mm
LQM31PNR47M00
(2)
Murata
TDK
MIPF2520D1R5
FDK(3)
MIC23030-xYMT
1
1µH, 0.8A, 100mΩ, L2.5mm x W1.8mm x H1.35mm
1.5µH, 1.5A, 70mΩ, L2.5mm x W2mm x H1.0mm
Coilcraft(4)
Micrel, Inc.
2
0.47µH, 1.4A, 80mΩ, L3.2mm x W1.6mm x H0.85mm
(1)
GLF251812T1R0M
Qty.
4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603
(2)
LQM21PNR47M00
EPL2010-471
U1
Manufacturer
(5)
0.47µH, 1.6A, 40mΩ, L2.0mm x W1.8mm x H1.0mm
8MHz 400mA Buck Regulator with HyperLight Load™ Mode
1
Notes:
1. TDK: www.tdk.com
2. Murata: www.murata.com
3. FDK: www.fdk.co.jp
4. Coilcraft: www.coilcraft.com
5. Micrel, Inc.: www.micrel.com
August 2008
13
M9999-082608-B
Micrel Inc.
MIC23030
MIC23030 Typical Application Circuit (Adjustable 1.8V)
U1 MIC23030
J1
VIN
J5
EN
SW
VIN
C1
J3
VOUT
L1
SNS
EN
C2
FB
R2
200k
PGND
J2
GND
R1
383k
J4
GND
Bill of Materials
Item
C1, C2
Part Number
C1608X5R0J475K
Manufacturer
(1)
TDK
Description
Qty.
4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603
2
(2)
R1
CRCW06033833FT1
Vishay
383kΩ, 1%, Size 0603
1
R2
CRCW06032003FT1
Vishay(2)
200kΩ, 1%, Size 0603
1
LQM21PNR47M00
L1
0.47µH, 0.9A, 90mΩ, L2mm x W1.25mm x H0.5mm
(3)
Murata
LQH32CNR47M33
Murata
0.47µH, 1.1A, 42mΩ, L3.2mm x W2.5mm x H2.0mm
LQM31PNR47M00
Murata(3)
0.47µH, 1.4A, 80mΩ, L3.2mm x W1.6mm x H0.85mm
(1)
GLF251812T1R0M
TDK
MIPF2520D1R5
FDK(4)
EPL2010-471
U1
(3)
MIC23030-AYMT
Coilcraft
1
1µH, 0.8A, 100mΩ, L2.5mm x W1.8mm x H1.35mm
1.5µH, 1.5A, 70mΩ, L2.5mm x W2mm x H1.0mm
(5)
Micrel, Inc.(6)
0.47µH, 1.6A, 40mΩ, L2.0mm x W1.8mm x H1.0mm
8MHz 400mA Buck Regulator with HyperLight Load™ Mode
1
Notes:
1. TDK: www.tdk.com
2. Vishay: www.vishay.com
3. Murata: www.murata.com
4. FDK: www.fdk.co.jp
5. Coilcraft: www.coilcraft.com
6. Micrel, Inc.: www.micrel.com
August 2008
14
M9999-082608-B
Micrel Inc.
MIC23030
PCB Layout Recommendations (Fixed)
Fixed Top Layer
Fixed Bottom Layer
August 2008
15
M9999-082608-B
Micrel Inc.
MIC23030
PCB Layout Recommendations (Adjustable)
Adjustable Top Layer
Adjustable Bottom Layer
August 2008
16
M9999-082608-B
Micrel Inc.
MIC23030
Package Information
6-Pin (1.6mm x 1.6mm) Thin MLF® (MT)
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.
© 2008 Micrel, Incorporated.
August 2008
17
M9999-082608-B