MIC23155

MIC23155
3MHz PWM 2A Buck Regulator with
HyperLight Load® and Power Good
General Description
Features
The MIC23155 is a high-efficiency 3MHz 2A synchronous
buck regulator with HyperLight Load mode, power good
output indicator, and programmable soft start. HyperLight
Load provides very high efficiency at light loads and ultrafast transient response which makes the MIC23155
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 2.5mm x
2.5mm Thin DFN package saves precious board space
and requires only four external components.
The MIC23155 is designed for use with a very small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2µF that enables a total solution size, less than 1mm
in height.
The MIC23155 has a very low quiescent current of 22µA
and achieves a peak efficiency of 94% in continuous
conduction mode. In discontinuous conduction mode, the
MIC23155 can achieve 85% efficiency at 1mA.
The MIC23155 is available in a 10-pin 2.5mm x 2.5mm
Thin DFN 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
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Input voltage: 2.7V to 5.5V
Output voltage: fixed or adjustable (down to 0.7V)
Up to 2A output current
Up to 94% peak efficiency
85% typical efficiency at 1mA
Power good output
Programmable soft start
22µA typical quiescent current
3MHz PWM operation in continuous conduction mode
Ultra-fast transient response
Active output discharge when disabled
Low output voltage ripple
Fully-integrated MOSFET switches
0.01µA shutdown current
Thermal-shutdown and current-limit protection
10-pin 2.5mm x 2.5mm Thin DFN
–40°C to +125°C junction temperature range
Applications
• Solid state drives (SSD)
• Smart phones
• Tablet PCs
• Mobile handsets
• Portable devices (PMP, PND, UMPC)
• WiFi/WiMax/WiBro applications
____________________________________________________________________________________________________________
Typical Application
Fixed Output Voltage
Adjustable Output Voltage
HyperLight Load is a registered trademark of Micrel, 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 2012
M9999-110812-A
Micrel Inc.
MIC23155
Ordering Information
Part Number
Marking Code
Nominal Output Voltage
Junction
Temperature
Range
Package
MIC23155-GYMT
QLG
1.8V
–40°C to +125°C
10-Pin 2.5mm x 2.5mm Thin DFN
MIC23155YMT
QLA
Adjustable
–40°C to +125°C
10-Pin 2.5mm x 2.5mm Thin DFN
Notes:
1.
Other fixed output voltage options available. Contact Micrel Marketing for details.
2.
Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
3.
Thin DFN ▲ = Pin 1 identifier.
Pin Configuration
2.5mm x 2.5mm Thin DFN (MT)
Fixed Output Voltage
(Top View)
2.5mm x 2.5mm Thin DFN (MT)
Adjustable Output Voltage
(Top View)
Pin Description
Pin Number
Pin Number
(Fixed)
(Adjustable)
1
1
SW
Output Switch Node
2
2
EN
Enable: Logic high enables operation of the regulator. Logic low will shut
down the device. Do not leave floating.
3
3
SNS
4
−
NC
Not internally connected.
−
4
FB
Feedback connection for output voltage sensing.
5
5
PG
Power Good Indicator. Open drain output.
6
6
SS
Programmable Soft-Start Pin. Do not leave floating.
7
7
AGND
8,9
8,9
VIN
10
10
PGND
Power Ground. Ground path for high current circuitry.
ePAD
ePAD
ePAD
Exposed heat sink pad. Connect to PGND.
November 2012
Pin Name
Pin Function
Output Voltage Sensing Pin. When disabled, provides output discharge.
Analog Ground. Ground path for bias and control circuitry.
Input Voltage Supply.
2
M9999-110812-A
Micrel Inc.
MIC23155
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) .......................................... −0.3V to 6V
Sense Voltage (VSNS) ........................................ −0.3V to VIN
Output Switch Voltage (VSW) ............................. −0.3V to VIN
Enable Input Voltage (VEN) .. ..............................−0.3V to VIN
Power Good Voltage (VPG) ................................ −0.3V to VIN
Storage Temperature Range .. ……………−65°C to +150°C
Lead temperature (soldering, 10 sec.) ....................... 260°C
(3)
ESD Rating ................................................. ESD Sensitive
Supply Voltage (VIN) ... …………………………..2.7V to 5.5V
Enable Input Voltage (VEN) .. ……………………….0V to VIN
Sense Voltage (VSNS) .......................................... 0.7V to VIN
Junction Temperature Range (TJ).. ….−40°C ≤ TJ ≤ +125°C
Thermal Resistance
2.5mm x 2.5mm Thin DFN-10 (θJA) ................... 90°C/W
2.5mm x 2.5mm Thin DFN-10 (θJC) ................... 63°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
otherwise noted.
Parameter
Condition
Min.
Undervoltage Lockout Threshold
2.45
Rising
Undervoltage Lockout Hysteresis
IOUT = 0mA , SNS > 1.2 * VOUTNOM
Shutdown Current
VEN = 0V; VIN = 5.5V
VIN = 3.6V if VOUTNOM < 2.5V, ILOAD = 20mA
VIN = 4.5V if VOUTNOM ≥ 2.5V, ILOAD = 20mA
Feedback Regulation Voltage
ILOAD = 20mA
Feedback Bias Current
IFB
Current Limit
SNS = 0.9*VOUTNOM
Output Voltage Line Regulation
Output Voltage Load Regulation
PWM Switch RDSON
2.55
Max.
Units
5.5
V
2.65
V
75
Quiescent Current
Output Voltage Accuracy (Fixed)
Typ.
2.7
Supply Voltage Range
45
µA
0.01
5
µA
+2.5
%
0.6355
V
−2.5
0.6045
2.2
mV
22
0.62
1
nA
3.3
A
0.3
%/V
0.3
%
0.7
%
VIN = 3.6V to 5.5V if VOUTNOM < 2.5V, ILOAD = 20mA
VIN = 4.5V to 5.5V if VOUTNOM ≥ 2.5V, ILOAD = 20mA
20mA < ILOAD < 500mA, VIN = 3.6V if VOUTNOM < 2.5V
20mA < ILOAD < 500mA, VIN = 5.0V if VOUTNOM ≥ 2.5V
20mA < ILOAD < 1A, VIN = 3.6V if VOUTNOM < 2.5V
20mA < ILOAD < 1A, VIN = 5.0V if VOUTNOM ≥ 2.5V
ISW = 100mA PMOS
0.20
ISW = -100mA NMOS
0.19
Ω
Switching Frequency
IOUT = 180mA
3
Soft Start Time
VOUT = 90%, CSS = 470pF
320
µs
Soft Start Current
VSS = 0V
2.7
µA
Power Good Threshold (Rising)
85
Power Good Threshold Hysteresis
Power Good Delay Time
Rising
Power Good Pull-Down
Resistance
91
MHz
95
%
7
%
68
µs
165
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.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4.
Specification for packaged product only.
November 2012
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MIC23155
Electrical Characteristics(4) (Continued)
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
otherwise noted.
Parameter
Enable Input Voltage
Condition
Min.
Typ.
Logic Low
Max.
Units
0.5
V
1.2
Logic High
Enable Input Current
V
0.1
2
µA
165
Ω
Overtemperature Shutdown
160
°C
Shutdown Hysteresis
20
°C
Output Discharge Resistance
November 2012
EN = 0V
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Micrel Inc.
MIC23155
Typical Characteristics
100
100
100
90
90
90
80
80
70
60
VIN = 5V
VIN = 4.2V
50
40
30
20
80
VIN = 3.6V
70
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
Efficiency (VOUT = 1.8V)
vs. Output Current
Efficiency (VOUT = 2.5V)
vs. Output Current
Efficiency (VOUT = 3.3V)
vs. Output Current
VIN = 4.2V
60
VIN = 5V
50
40
30
20
COUT = 4.7µF
L = 1µH
10
10
100
1000
10000
OUTPUT CURRENT (mA)
10
100
10000
1000
VOUTNOM = 1.8V
COUT = 4.7µF
3.50
3.00
2.50
2.00
1.50
1.00
VOUTNOM = 1.8V
COUT = 4.7µF
1000
10000
CSS (pF)
November 2012
100000
1000000
T = 125°C
35
T = 25°C
30
25
20
15
T = - 45°C
10
NO SWITCHING
SNS > VOUTNOM × 1.2
COUT = 4.7µF
5
0.00
100
10000
40
0.50
1
1000
Quiescent Current
vs. Input Voltage
QUIESCENT CURRENT (µA)
CURRENT LIMIT (A)
RISE TIME (µs)
10
100
Current Limit
vs. Input Voltage
4.00
100
10
OUTPUT CURRENT (mA)
4.50
1000
COUT = 4.7µF
L = 1µH
1
5.00
10000
30
OUTPUT CURRENT (mA)
VOUT Rise Time
vs. CSS
100000
40
0
1
1000000
VIN = 5V
VIN = 3.6V
50
10
0
1
60
20
COUT = 4.7µF
L = 1µH
10
0
VIN = 4.2V
70 VIN =2.7V
0
2.7
3.2
3.7
4.2
4.7
INPUT VOLTAGE (V)
5
5.2
5.7
2.7
3.2
3.7
4.2
4.7
5.2
5.7
INPUT VOLTAGE (V)
M9999-110812-A
Micrel Inc.
MIC23155
Typical Characteristics (Continued)
VOUTMAX vs. VIN
5
100mA
OUTPUT VOLTAGE (V)
4.5
4
400mA
3.5
1.2A
3
2.5
2
800mA
1.5
1
0.5
0
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
Feedback Voltage
vs. Temperature
Switching Frequency
vs. Temperature
6
SWITCHING FREQUENCY (MHz)
FEEDBACK VOLTAGE (V)
0.65
0.64
0.63
0.62
0.61
0.60
VIN = 3.6V
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
VIN = 3.6V
VOUTNOM = 1.8V
COUT = 4.7µF
0.5
0
0.59
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
November 2012
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
6
M9999-110812-A
Micrel Inc.
MIC23155
Functional Characteristics
November 2012
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MIC23155
Functional Characteristics (Continued)
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Micrel Inc.
MIC23155
Functional Characteristics (Continued)
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MIC23155
Functional Diagram
Figure 1. Simplified MIC23155 Functional Block Diagram – Fixed Output Voltage
Figure 2. Simplified MIC23155 Functional Block Diagram – Adjustable Output Voltage
November 2012
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Micrel Inc.
MIC23155
PGND
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.
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. 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 PCB Layout Recommendations for
details.
PG
The power good (PG) pin is an open drain output which
indicates when the output voltage is within regulation.
This is indicated by a logic high signal when the output
voltage is above the PG threshold. Connect a pull up
resistor greater than 5kΩ from PG to VOUT.
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. MIC23155 features external soft start circuitry
via the SS pin that reduces inrush current and prevents
the output voltage from overshooting at start up. Do not
leave the EN pin floating.
SS
The SS pin is used to control the output voltage ramp up
time. The approximate equation for the ramp time in
3
milliseconds is 270x10 x ln(10) x CSS. For example, for
a CSS = 470pF, TRISE ≈ 300µs. Refer to the “VOUT Rise
Time vs. CSS” graph in the Typical Characteristics
section. The minimum recommended value for CSS is
200pF.
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.
FB
The feedback (FB) pin is provided for the adjustable
voltage option. This is the control input for setting the
output voltage. A resistor divider network is connected to
this pin from the output and is compared to the internal
0.62V reference within the regulation loop.
The output voltage can be calculated using Equation 1:
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. The SNS pin also provides the output active
discharge circuit path to pull down the output voltage
when the device is disabled.
R1 

VOUT = VREF ⋅ 1 +

R2 

Recommended feedback resistor values:
AGND
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.
November 2012
Eq. 1
11
VOUT
R1
R2
1.2V
274k
294k
1.5V
316k
221k
1.8V
301k
158k
2.5V
324k
107k
3.3V
309k
71.5k
M9999-110812-A
Micrel Inc.
MIC23155
Peak current can be calculated in Equation 2:
Application Information
The MIC23155 is a high performance DC/DC step-down
regulator offering a small solution size. Supporting an
output current up to 2A in a tiny 2.5mm x 2.5mm Thin
DFN package, the IC requires only four external
components while meeting today’s miniature portable
electronic device needs. Using the HyperLight Load
switching scheme, the MIC23155 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
IPEAK = IOUT + VOUT 
 2× f ×L




Eq. 2
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 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” subsection.
The transition between continuous conduction code
(CCM) to HyperLight Load mode is determined by the
inductor ripple current and the load current.
Input Capacitor
A 2.2µF ceramic capacitor or greater should be placed
close to the VIN pin and PGND pin for bypassing. A
Murata GRM188R60J475ME84D, 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.
Output Capacitor
The MIC23155 is 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 also increase solution size
or cost. A low equivalent series resistance (ESR)
ceramic output capacitor such as the Murata
GRM188R60J475ME84D, size 0603, 4.7µF ceramic
capacitor is recommended based upon performance,
size and cost. Both the X7R or X5R temperature rating
capacitors are recommended.
Inductor Selection
When selecting an inductor, it is important to consider
the following factors:
•
Inductance
•
Rated current value
•
Size requirements
•
DC resistance (DCR)
Figure 3. Transition between CCM Mode to HLL Mode
Figure 3 illustrates the signals for high-side switch drive
(HSD) for TON control, the Inductor current, and the lowside switch drive (LSD) for TOFF control.
In HLL mode, the inductor is charged with a fixed Ton
pulse on the high side switch. After this, the low side
switch is turned on and current falls at a rate VOUT/L. The
controller remains in HLL mode while the inductor falling
current is detected to cross approximately -50mA. When
the LSD (or TOFF) time reaches its minimum and the
inductor falling current is no longer able to reach the
threshold, the part is in CCM mode.
The MIC23155 is 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
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.
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MIC23155
Figure 4 illustrates 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 MIC23155 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 in
:
Once in CCM mode, the TOFF time will not vary.
Therefore, it is important to note that if L is large enough,
the HLL transition level will not be triggered.
That inductor is illustrated in Figure 3:
L MAX =
VOUT − 135ns
Eq. 3
2 − 50mA
Duty Cycle
The typical maximum duty cycle of the MIC23155 is
80%.
Efficiency Considerations
Efficiency is defined as the amount of useful output
power, divided by the amount of power supplied (see
Figure 4):
V
×I
Efficiency % =  OUT OUT
 VIN × IIN

 × 100

2
PDCR = IOUT x DCR
From that, the loss in efficiency due to inductor
resistance can be calculated as in Equation 6:
Eq. 4
 
VOUT × IOUT
Efficiency Loss = 1 − 
  VOUT × IOUT + PDCR
There are two types of losses in switching converters;
DC losses and switching losses. DC losses are simply
2
the power dissipation of I R. 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 3MHz
frequency and the switching transitions make up the
switching losses.
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
The MIC23155 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 minimumoff-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 MIC23155 works
in HyperLight Load 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 MIC23155 during light load
currents by only switching when it is needed.
Efficiency (VOUT = 1.8V)
90
EFFICIENCY (%)
80
VIN = 4.2V
VIN =2.7V
60
VIN = 3.6V
50
VIN = 5V
40
30
20
10
COUT = 4.7µF
0
1
10
100
1000
10000
OUTPUT CURRENT (mA)
Figure 4. Efficiency under Load
November 2012


 × 100

Eq. 6
100
70
Eq. 5
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Micrel Inc.
MIC23155
As the load current increases, the MIC23155 goes into
continuous conduction mode (CCM) and switches at a
frequency centered at 3MHz. The equation to calculate
the load when the MIC23155 goes into continuous
conduction mode may be approximated as illustrated in
Figure 7:
 (V − VOUT ) × D 
ILOAD >  IN

2L × f


Eq. 7
As shown in the previous equation, the load at which the
MIC23155 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). As shown in Figure 5, as the output
current increases, the switching frequency also
increases until the MIC23155 goes from HyperLight
Load mode to PWM mode at approximately 180mA. The
MIC23155 will switch at a relatively constant frequency
around 3MHz once the output current is over 180mA.
Switching Frequency
vs. Output Current
5.0
SWITCHING FREQUENCY (MHz)
4.5
4.0
L=0.47µH
3.5
3.0
2.5
L=1.0µH
2.0
1.5
1.0
0.5
0.0
0.1
1
10
100
1000
10000
OUTPUT CURRENT (mA)
Figure 5. SW Frequency vs. Output Current
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MIC23155
Typical Application Circuit (Fixed Output)
Bill of Materials
Item
C1, C2
C3
L1
Part Number
Manufacturer
Description
Qty.
(1)
C1608X5R0J475K
TDK
GRM188R60J475KE19D
Murata
(2)
Ceramic Capacitor, 4.7µF, 6.3V, X5R, Size 0603
2
1
C1608NPO0J471K
TDK
Ceramic Capacitor, 470pF, 6.3V, NPO, Size 0603
VLS3012ST-1R0N1R9
TDK
1µH, 2A, 60mΩ, L3.0mm x W3.0mm x H1.0mm
LQH44PN1R0NJ0
Murata
1µH, 2.8A, 50mΩ, L4.0mm x W4.0mm x H1.2mm
(3)
R3
CRCW06031002FKEA
Vishay
U1
MIC23155-xYMT
Micrel, Inc.
(4)
1
Resistor,10k, Size 0603
1
3MHz 2A Buck Regulator with HyperLight Load Mode
1
Notes:
1.
TDK: www.tdk.com.
2.
Murata: www.murata.com.
3.
Vishay: www.vishay.com.
4.
Micrel, Inc.: www.micrel.com.
November 2012
15
M9999-110812-A
Micrel Inc.
MIC23155
Typical Application Circuit (Adjustable Output)
Bill of Materials
Item
C1, C2
C3
L1
Part Number
Manufacturer
Description
TDK
GRM188R60J475KE19D
Murata
(2)
Ceramic Capacitor, 4.7µF, 6.3V, X5R, Size 0603
2
1
C1608NPO0J471K
TDK
Ceramic Capacitor, 470pF, 6.3V, NPO, Size 0603
VLS3010ST-1R0N1R9
TDK
1µH, 2A, 60mΩ, L3.0mm x W3.0mm x H1.0mm
LQH44PN1R0NJ0
Murata
R1
CRCW06033013FKEA
R2
CRCW06031583FKEA
R3
CRCW06031002FKEA
U1
MIC23155YMT
Qty.
(1)
C1608X5R0J475K
1µH, 2.8A, 50mΩ, L4.0mm x W4.0mm x H1.2mm
(3)
Vishay
Vishay
Vishay
(4)
Micrel, Inc.
1
Resistor,301k, Size 0603
1
Resistor,158k, Size 0603
1
Resistor,10k, Size 0603
1
3MHz 2A Buck Regulator with HyperLight Load Mode
1
Notes:
1.
TDK: www.tdk.com.
2.
Murata: www.murata.com.
3.
4.
Vishay: www.vishay.com.
Micrel, Inc.: www.micrel.com.
November 2012
16
M9999-110812-A
Micrel Inc.
MIC23155
PCB Layout Recommendations
Top Layer
Bottom Layer
November 2012
17
M9999-110812-A
Micrel Inc.
MIC23155
Package Information(1)
10-Pin 2.5mm x 2.5mm Thin DFN
Note:
1.
Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
November 2012
18
M9999-110812-A
Micrel Inc.
MIC23155
Recommended Land Pattern
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November 2012
19
M9999-110812-A