MIC33030
8MHz 400mA Internal Inductor Buck
Regulator with HyperLight Load™
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
February 2011
General Description
The MIC33030 is a high-efficiency, 8MHz, 400mA
synchronous buck regulator with an internal inductor and
HyperLight Load™ mode. HyperLight Load™ provides
very-high efficiency at light loads and ultra-fast transient
response that is perfectly suited for supplying processor
core voltages. An additional benefit of this proprietary
architecture is the very-low output ripple voltage
throughout the entire load range with the use of small
output capacitors. The tiny 2.5mm x 2.0mm MLF® package
saves precious board space and requires only two external
capacitors.
The MIC33030 is designed for use with tiny output
capacitors as small as 2.2µF. This gives the MIC33030 the
ease of use of an LDO with the efficiency of a HyperLight
Load™ DC converter.
The MIC33030 achieves efficiency in HyperLight Load™
mode as high as 78% at 1mA, with a very-low quiescent
current of 21µA. At higher loads, the MIC33030 provides a
constant switching frequency up to 8MHz.
The MIC33030 is available in a 10-pin 2.5mm x 2.0mm
MLF® package with an operating junction temperature
range of –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Internal Inductor
Simplifies design to two external capacitors
• Input voltage: 2.7V to 5.5V
• Output voltage accuracy of ±2.5% over temperature
• 400mA output current
• Efficiency up to 78% at 1mA
• 21µA typical quiescent current
• Up to 8MHz PWM operation in continuous mode
• Ultra-fast transient response
• Low-voltage output ripple
30mVpp ripple in HyperLight Load™ mode
7mV 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
(0.7V to 3.6V)
• 2.5mm x 2.0mm 10-Lead 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
Fixed-Output MIC33030 Adjustable-Output MIC33030
M9999-020311-C
Micrel Inc. MIC33030
February 2011 2 M9999-020311-C
Ordering Information
Part Number Marking
Code Nominal Output
Voltage Junction Temperature
Range Package Lead Finish
MIC33030-AYHJ 3GFA ADJ –40°C to +125°C 10-pin 2.5mm x 2.0mm MLF® Pb-Free
MIC33030-JYHJ 3GFJ 2.5V –40°C to +125°C 10-pin 2.5mm x 2.0mm MLF® Pb-Free
MIC33030-GYHJ 3GFG 1.8V –40°C to +125°C 10-pin 2.5mm x 2.0mm MLF® Pb-Free
MIC33030-4YHJ 3GF4 1.2V –40°C to +125°C 10-pin 2.5mm x 2.0mm MLF® Pb-Free
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.
Pin Configur ation
2.5mm x 2.0mm MLF® (HJ) 2.5mm x 2.0mm MLF® (HJ)
Fixed (Top View) Adjustable (Top View)
Pin Description
Fixed Option ADJ Option Pin Name Pin Function
1 1 SNS
Sense: Connect to VOUT as close to output capacitor as possible to sense
output voltage.
2 − NC Not internally connected.
− 2 FB
Feedback: Connect resistor divider at this node to set output voltage. Resistors
should be selected based on a nominal VFB = 0.62V.
3 3 EN
Enable: Logic high enables operation of the regulator. Logic low will shut down
the device. Do not leave floating.
4, 5 4, 5 SW Switch: Internal power MOSFET output switches.
6, 7 6, 7 VOUT Output Voltage: The output of the regulator. Connect to SNS pin. For adjustable
option, connect to feedback resistor network.
8 8 PGND Power Ground.
9 9 AGND Analog Ground.
10 10 VIN Input Voltage: Connect a capacitor to ground to decouple the noise.
EP EP HS PAD Connect to PGND or AGND.
Micrel Inc. MIC33030
February 2011 3 M9999-020311-C
Absolute Maximum Ratings(1)
Supply Voltage (VIN)........................................... -0.3V to 6V
Sense (VSNS)....................................................... -0.3V to 6V
Output Switch Voltage .................................... -0.3V to 6V
Enable Input Voltage (VEN).. ..............................-0.3V to VIN
Storage Temperature Range .. ……………-65°C to +150°C
ESD Rating(3)................................................. ESD Sensitive
Operating Ratings(2)
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
2.5mm x 2.0mm MLF®-10 (θJA) .........................76°C/W
2.5mm x 2.0mm MLF®-10 (θJC) .........................45°C/W
Electrical Characteristics(4)
TA = 25°C; VIN = VEN = 3.6V; COUT = 4.7µF unless otherwise specified. Bold values indicate –40°C TJ +125°C, unless
noted.
Parameter Condition Min. Typ. Max. Units
Supply Voltage Range 2.7 5.5 V
Under-Voltage Lockout Threshold (turn-on) 2.45 2.55 2.65 V
Under-Voltage Lockout Hysteresis 100 mV
Quiescent Current IOUT = 0mA , SNS > 1.2 * VOUT Nominal 21 35 µA
Shutdown Current VEN = 0V; VIN = 5.5V 0.01 4 µA
Output Voltage Accuracy VIN = 3.6V; ILOAD = 20mA -2.5 +2.5
%
Feedback Voltage Adjustable Option Only 0.62 V
Current Limit SNS = 0.9*VOUTNOM 0.41 0.7 1 A
Output Voltage Line Regulation VIN = 3.0V to 5.5V, VOUT = 1.2V, ILOAD = 20mA, 0.5 %/V
Output Voltage Load Regulation 20mA < ILOAD < 400mA, VOUT = 1.2V,
VIN = 3.6V 0.7 %
ISW = 100mA PMOS 0.65 Ω
PWM Switch ON-Resistance ISW = -100mA NMOS 0.8 Ω
Maximum Frequency IOUT = 120mA 8 MHz
Soft Start Time VOUT = 90% 100 µs
Enable Threshold 0.5 0.9 1.2 V
Enable Hysteresis 35 mV
Enable Input Current 0.1 2 µA
Over-Temperature Shutdown
160 °C
Over-Temperature Shutdown Hysteresis 20 °C
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, 1.5k in series with 100pF.
4. Specification for packaged product only.
Micrel Inc. MIC33030
Typical Characteristics
February 2011 4 M9999-020311-C
Effici ency vs. Load
(V
OUT
= 2.5V)
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
EFFI CIENCY ( % )
0.0%
0.1 1 10 100 1000
LO AD CURRENT ( mA)
VIN = 3.6V
VIN = 5V
Efficien cy vs . Load
(V
OUT
= 1.5V)
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
EFFICI E NCY (%)
0.0%
0.1 1 10 100 1000
LO AD CURRENT ( mA )
VIN = 3V
VIN = 3.6V
VIN = 4.2V
Efficien cy v s. Load
(V
OUT
= 1.8V)
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
0.1 1 10 100 1000
LO AD CURRENT (mA)
EFFICI ENCY (%)
VIN = 4.2V
VIN = 3.6V
VIN = 3V
Efficien cy v s. Load
(V
OUT
= 1V)
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
0.1 1 10 100 1000
LOAD CURRENT ( mA )
EFFICI ENCY (%)
VIN = 3V
VIN = 4.2V
VIN = 3.6V
Ef fic iency vs. Lo ad
(V
OUT
= 1.2V)
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
EFFI CIENCY (% )
Quiescent Current vs. Input Voltage
( Not Sw itching)
0
5
10
15
20
25
30
2.5 3.5 4.5 5.5 6.5
I NPUT VOLTAGE ( V)
I NP UT CURRE NT (µA)
VIN = 3V
VIN = 4.2V
VIN = 3.6V
0.0%
0.1 1 10 100 1000
LO AD CURRENT ( m A)
Output Voltage vs. Input Voltage
1.7
1.725
1.75
1.775
1.8
1.825
1.85
1.875
1.9
V
OUT
(V)
2.533.544.555.56
V
IN
(V)
IOUT = 120mA
IOUT = 20mA
Qui escent Current vs. Temperature
( Not Sw itching)
10
12
14
16
18
20
22
24
26
28
30
-60 -40 -20 0 20 40 60 80 100 120 140 160
TEM P ERATURE (°C)
I NPUT CURRENT (µA)
Out put Voltage vs. O utput Current
1.7
1.725
1.75
1.775
1.8
1.825
1.85
1.875
1.9
1 10 100 1000
I
OUT
(mA)
V
OUT
(V)
VIN = 4.2V
VIN = 3V
VIN = 3.6V
Micrel Inc. MIC33030
Typical Characteristics (Continued)
February 2011 5 M9999-020311-C
Output V olt ag e vs . Temperature
1.7
1.725
1.75
1.775
1.8
1.825
1.85
1.875
1.9
-60 -40 -20 0 20 40 60 80 100 120 140
TEM P ERATURE ( ° C)
O UTPUT VOLTAG E ( V)
Swi tching Frequency
vs. Temperature
4
4.5
5
5.5
6
6.5
7
7.5
8
SW I T CHI NG FREQUENCY (MHz)
-60 -40 -20 0 20 40 60 80 100 120 140
TEM PERATURE ( °C)
I
OUT
= 120mA
Swi tching Frequency
vs. Load C urrent
0.1
1
10
100
1000
10000
SWITCHING FREQUENCY (kHz)
VIN = 3.6V
VIN = 4.2V
VIN = 3V
0.01
0.001 0.01 0.1 1 10 100 1000
LOAD CURRE NT (mA)
Enable (ON) Voltage
vs. Input V oltage
0
0.2
0.4
0.6
0.8
1
1.2
ENABLE VOLTAG E (V)
2.533.544.555.56
I NPUT VOLTA GE (V)
Enable Voltage
vs. Temperat ure
0
0.2
0.4
0.6
0.8
1
1.2
-60-40-20 0 20406080100120140
TEMPERA TURE (° C)
ENABLE VO L TAGE (V)
VIN = 5.5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
Current Li m it vs. Input Voltage
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2 2.5 3 3.5 4 4.5 5 5.5 6
V
IN
(V)
CURRENT L IMIT ( A)
Micrel Inc. MIC33030
Functional Characteristics
February 2011 6 M9999-020311-C
Micrel Inc. MIC33030
February 2011 7 M9999-020311-C
Functional Characteristics (Continued)
Micrel Inc. MIC33030
February 2011 8 M9999-020311-C
Functional Characteristics (Continued)
Micrel Inc. MIC33030
February 2011 9 M9999-020311-C
Functional Diagram
Simplified MIC33030 Fixed Functional Block Diagram
Simplified MIC33030 Adjustable Functional Block Diagram
Micrel Inc. MIC33030
February 2011 10
M9999-020311-C
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.
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. The MIC33030 features built-in soft-start
circuitry that reduces in-rush current and prevents the
output voltage from overshooting at start up. Do not
leave the enable pin floating.
SW
The switch (SW) connects directly to one end of the
internal 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. As
the MIC33030 has an internal inductor, this pin is not
routed in most applications.
VOUT
The output pin (VOUT) is the output voltage pin following
the internal inductor. Connect a minimum of 2.2uF
output filter capacitor to this pin.
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
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.
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:
⎟
⎠
⎞
⎜
⎝
⎛+
Ω
=1
k200
1R
V620VOUT .
Figure 1. MIC33030-AYHJ Schematic
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.
Micrel Inc. MIC33030
February 2011 11 M9999-020311-C
Application Information
The MIC33030 is a high-performance DC/DC step down
regulator offering a small solution size. Supporting an
output current up to 400mA inside a tiny 2.5mm x 2.0mm
MLF® package and requiring only two external
components, the MIC33030 meets today’s miniature
portable electronic device needs. Using the HyperLight
Load™ switching scheme, the MIC33030 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.
Input Capacitor
A 2.2µF ceramic capacitor or greater should be placed
close to the VIN pin and PGND 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.
Output Capacitor
The MIC33030 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.
Compensation
The MIC33030 is designed to be stable with a minimum
of 2.2µF ceramic (X5R) output capacitor.
Duty Cycle
The typical maximum duty cycle of the MIC33030 is
90%.
Efficiency Considerations
Efficiency is defined as the amount of useful output
power, divided by the amount of power supplied.
100×
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
×
×
=ININ
OUTOUT IV IV
%Efficiency
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
which 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 N-
channel 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.
Ef fi ciency vs. Load
(V
OUT
= 2.5V)
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
1 10 100 1000
LO A D CURRENT (m A)
EFFI CIENCY (%)
VIN = 3.6V
Figure 2. Efficiency under Load
Figure 2 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 MIC33030 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.
Micrel Inc. MIC33030
February 2011 12 M9999-020311-C
The DCR losses can be calculated as follows:
PDCR = IOUT2 x DCR
From that, the loss in efficiency due to inductor
resistance can be calculated as follows:
100
PIV IV
1LossEfficiency DCROUTOUT
OUTOUT ×
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+×
×
−=
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.
The effect of MOSFET voltage drops and DCR losses in
conjunction with the maximum duty cycle combine to
limit maximum output voltage for a given input voltage.
The following graph shows this relationship based on the
typical resistive losses in the MIC33030:
HyperLight Load™ Mode
MIC33030 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-
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 MIC33030 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
MIC33030 during light load currents by only switching
when it is needed. As the load current increases, the
MIC33030 goes into continuous conduction mode (CCM)
and switches at a frequency centered at 8MHz. The
equation to calculate the load when the MIC33030 goes
into continuous conduction mode may be approximated
by the following formula:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
×
×−
>fL DVV
IOUTIN
LOAD 2
)(
As shown in the above equation, the load at which
MIC33030 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). Since the inductance of MIC33030 is
0.36H, the device will enter HyperLight Load™ mode or
PWM mode at approximately 150mA.
Micrel Inc. MIC33030
February 2011 13 M9999-020311-C
Power Dissipation Considerations
As with all power devices, the ultimate current rating of
the output is limited by the thermal properties of the
package and the PCB it is mounted on. There is a
simple, ohms law type relationship between thermal
resistance, power dissipation and temperature which are
analogous to an electrical circuit:
From this simple circuit we can calculate Vx if we know
Isource, Vz and the resistor values, Rxy and Ryz using
the equation:
()
VzRyzRxyIsourceVx ++⋅=
Thermal circuits can be considered using these same
rules and can be drawn similarly replacing current
sources with Power dissipation (in Watts), Resistance
with Thermal Resistance (in ºC/W) and Voltage sources
with temperature (in ºC):
Now replacing the variables in the equation for Vx, we
can find the junction temperature (TJ) from power
dissipation, ambient temperature and the known thermal
resistance of the PCB (RθCA) and the package (RθJC):
()
CAJCDISSJ RRPT +⋅= AMB
T+
θ
θ
As can be seen in the diagram, total thermal resistance
RθJA = RθJC + RθCA. Hence this can also be written:
()
AMBJADISSJ TRPT +⋅=
θ
Since effectively all of the power loss in the converter is
dissipated within the MIC33030 package, PDISS can be
calculated thus:
)( 1
1
PP OUTDISS −⋅=
η
Where
η
= Efficiency taken from efficiency curves
RθJC and RθJA are found in the operating ratings section
of the datasheet.
Example:
A MIC33030 is intended to drive a 300mA load at 1.8V
and is placed on a printed circuit board which has a
ground plane area of at least 25mm square. The Voltage
source is a Li-ion battery with a lower operating
threshold of 3V and the ambient temperature of the
assembly can be up to 50ºC.
Summary of variables:
IOUT = 0.3A
VOUT = 1.8V
VIN = 3V to 4.2V
TAMB = 50ºC
RθJA = 76ºC/W from Datasheet
η
@ 300mA = 75% (worst case with VIN=4.2V from the
Typical Characteristics Efficiency vs. Load graphs)
)
.
(.. 1
750
1
3081PDISS −⋅⋅= = 0.18W
The worst case switch and inductor resistance will
increase at higher temperatures, so a margin of 20% can
be added to account for this:
PDISS = 0.18 x 1.2 = .216W
Therefore:
TJ = 0.216W. (76 ºC/W) + 50ºC
TJ = 66ºC
This is well below the maximum 125ºC.
Micrel Inc. MIC33030
February 2011 14 M9999-020311-C
MIC33030 Typical Application Circuit (Fixed)
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1, C2 C1608X5R0J475K TDK(1) 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 2
R1 CRCW06031002FKEA Vishay(2) Resistor, 10k, Size 0603 1
U1 MIC33030-xYHJ Micrel, Inc.(3) 8MHz 400mA Integrated Inductor Buck Regulator w ith
HyperLight Load™ 1
Notes:
1. TDK: www.tdk.com.
2. Vishay: www.vishay.com.
3. Micrel, Inc.: www.micrel.com.
Micrel Inc. MIC33030
February 2011 15 M9999-020311-C
MIC33030 Typical Application Circuit (Adjustable 1.8V)
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1, C2 C1608X5R0J475K TDK(1) 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 2
R1 CRCW06031002FT1 Vishay(2) 10k , 1%, Size 0603 1
R2 CRCW06033013FT1 Vishay(2) 301k, 1%, Size 0603 1
R3 CRCW06031583FT1 Vishay(2) 158k, 1%, Size 0603 1
U1 MIC33030-AYHJ Micrel, Inc.(3) 8MHz 400mA Integrated Inductor Buck Regulator with
HyperLight Load™ 1
Notes:
1. TDK: www.tdk.com.
2. Vishay: www.vishay.com.
3. Micrel, Inc.: www.micrel.com.
Micrel Inc. MIC33030
February 2011 16 M9999-020311-C
PCB Layout Recommendations
Fixed Top Layer
Fixed Bottom Layer
Micrel Inc. MIC33030
Package Information
10-Pin (2.5mm x 2.0mm) MLF® (HJ)
February 2011 17 M9999-020311-C
Micrel Inc. MIC33030
February 2011 18 M9999-020311-C
Recommended Landing Pattern
10-Pin 2.5mm x 2mm MLF®
All dimensions in mm. Tolerance /- 0.05mm unless noted otherwise.
The red circle indicates a Thermal Via. The Size should be .300-.350 mm in diameter and it should be
connected to GND plane for maximum thermal performance.
Magenta colored pads: Indicate different potential; DO NOT connect to GND plane.
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