MIC33263/4
4MHz, 2 A Buck Regulator with Integr ated
Inductor and H yperLight Load®
HyperLight Load is a registered t radem ark 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
Januar y 2
8, 2015
Revision 2.1
General Description
The MIC33263/4 is a highly-efficient synchronous buck
regulator with an integrated inductor which provides the
optimal trade-off between footprint and efficiency. The
MIC33263/4 operates at 4MHz switching frequency and
provides up to 2A output current. In addition, the 100%
duty cycle and H yperLight Load® (HLL) mode-of-operation
delivers very-high efficiency at light loads and ultra-fast
transient response which m akes the MIC33263/4 perfectly
suited for any space-constrained application and great
alternati ve for lo w dropout r egulators . An additional be nefit
of this proprietary architecture is very low output ripple
voltage throughout the entire load range with the use of
small output capacitors.
The MIC33263/4 provides small compact total solution
size of 4.6mm × 7mm with very few tiny external
components.
At higher loads, the MIC33263/4 provides a constant
switching frequency around 4MHz while achieving peak
efficiencies up to 93%. It also includes under-voltage
lockout to ensure proper operation under power-sag
conditions, internal soft-start to reduce inrush current,
foldback current limit, power good (PG) indicator, and
thermal shutdown. The MIC33263/4 is available in a 20-pin
2.5mm × 3.0mm × 1.9m m QFN package with a n operating
junction temperature ran ge f r om –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s webs ite at : www.micrel.com.
Features
• Integrated MOSFETs, inductor
• 10 0% d uty cycle
• 4MHz PWM operation in continuous mode
• 2A output current
• Low output voltage ripple
• 85% typical efficiency at 1mA and up to 93% peak
efficiency
• Ultra-fast transient response
• Advanced copper lead frame design provides superior
thermal performance
• Thermal-shutdown and current-limit protection
• Low-radiated emission (EMI) per EN55022, class B
• Adjustable output voltage 0.7V to 5V
• Configurable soft-start with pre-bias start-up capability
• Auto discharge of 180Ω (MIC33264 only)
• Low profile 2.5mm × 3.0mm × 1.9mm QFN packages
• 0.1µA shutdown current
• 33µA quiescent current
Applications
• 5V point-of-load (POL)
• Low voltage distributed power sy stems
• Space-constrained applications
• Portable devices
• SSD storage systems
• Digital cameras
Typical Application
0
10
20
30
40
50
60
70
80
90
100
10 100 1000
EFFICENCY (%)
OUTPUT CURRENT (mA)
Efficiency
vs. Output Current
V
OUT
= 1.2V
V
IN
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 2 Revision 2.1
Ordering Information
Part Number Output Voltage Auto Discharge Junction Temperature Range Package
(1, 2)
MIC33263YGK ADJ No –40°C to +125°C 20-Pin 2.5mm × 3mm QFN
MIC33264YGK ADJ Yes –40°C to +125°C 20-Pin 2.5 mm × 3mm QFN
Note:
1. QFN is a GREEN, RoHS-compliant package. Mold compound is Halogen Free.
2. Pb-free. Lead finish is matte tin.
Pin Configuration
2.5mm × 3mm QFN (GK)
(Top View)
Pin Description
Pin Number Pin Name Pin Function
1, 20 PVIN Power Input Voltage: Connect a capacitor to PGND to decouple the noise.
2, 8, 9 PGND Power Ground.
3, 4, 5, 6, 7 SW Switch (Output): Internal power MOSFET output switches. Disable pull down 180 Ohms
(MIC33264 only).
10, 11, 12, 13 VOUT Inductor Output. Connect a capacitor to PGND to filter the switcher output voltage.
14 AGND Analog Ground: Connect to centr al groun d point w here all hi gh curr ent path s meet (CIN, COUT,
PGND) for best operation.
15 AVIN Analog Input Voltage: Connect a capacitor to ground to decouple the noise.
16 SS Soft-Start: Place a capacitor from SS pin to ground to program the soft-s tart time
17 PG Power Good: Open Drain output for the power good indicator. Place a resistor between this pin
and a voltage source to detect a power good condition.
18 FB Feedb ac k: Connec t a resistor div ider fr om the outp ut to grou nd to set the output voltage.
19 EN Enable (Input): Logic high enables operation of the regulator. Logic low will shut down the device.
Do not leave floating.
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 3 Revision 2.1
Absolute Maximum Ratings(3)
Supply Voltage (VIN = VAVIN = VPVIN) .................. −0.3V to 6V
Power Good Voltage (VPG) ................................ −0.3V to 6V
Output Switc h Voltage (VSW) ............................. −0.3V to 6V
Enable Input Voltage (VEN) .. ..............................−0.3V to VIN
Junction Temperature (TJ) ....................................... +150°C
Storage Temperature Range (TS) ............. −65°C to +150°C
Lead Temperature (soldering, 10s) ............................ 260°C
ESD Rating(5) ................................................. ESD Sensitive
Operating Ratings(4)
Supply Voltage (VIN = VAVIN = VPVIN) ................. 2.7V to 5.5V
Enable Input Voltage (VEN) .. ……………………….0V to VIN
Feedback Voltage (VFB) ...................................... 0.7V to VIN
Junction Temperature Range (TJ) .. ….−40°C ≤ TJ ≤ +125°C
Thermal Resistance
20-Pin 2.5mm × 3mm QFN (θJA) ........................ 50°C/W
Electrical Characteristics(6)
TA = 25°C; VIN = VEN = 3.6V; COUT = 22µF unless otherwise specified. Bold values indicate −40°C ≤ TJ ≤ +125°C, unle ss other w ise
specified.
Parameter Condition Min. Typ. Max. Units
Supply Voltage Range 2.7 5.5 V
Undervoltage Lockout Threshold Turn-On 2.40 2.53 2.65 V
Undervoltage Lockout Hysteresis 75 mV
Quiescent Current IOUT = 0mA , VSNS > 1.2 × VOUT Nominal 33 85 µA
Shutdown Current VEN = 0V; VIN = 5.5V 0.1 2 µA
Output Voltage Accuracy VIN = 3.6V if VOUTNOM < 2.5V, ILOAD = 20mA
−
2.5 +2.5 %
VIN = 5.5V if VOUTNOM ≥ 2.5V, ILOAD = 20mA
Feedback Regulation Voltage
0.682
0.7
0.717
V
Current Limit VSNS = 0.9 × VOUTNOM 2.5 3.3 A
Output Voltage Line Regulation VIN = 3.6V to 5.5V, ILOAD = 20mA 0.3 %/V
Output Voltage Load Regulation 20mA ≤ ILOAD ≤ 1A, VIN = 3.6V 0.3 %
20mA ≤ ILOAD ≤ 1A, VIN = 5.5V
PWM Switch On-Resistance ISW = 100mA PMOS 0.13 Ω
ISW = −100mA NMOS
Switching Frequency IOUT = 120mA 4 MHz
Soft-Start (SS) Time VOUT = 90%, CSS = 1nF 1000 µs
Soft-Start (SS) Current VSS = 0V 2.2 µA
Power Good (PG) Threshold (Rising) % of VNOM 85 90 95 %
Notes:
3. Exceeding the absolute maximum ratings may damage the device.
4. The device is not guarant eed to function outside its operat i ng ratings.
5. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
6. Specific at i on for pack aged product only
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 4 Revision 2.1
Electrical Characteristics(6) (Continued)
TA = 25°C; VIN = VEN = 3.6V; COUT = 22µF unless otherwise specified. Bold values indicate −40°C ≤ TJ ≤ +125°C, unle ss other w ise
specified.
Parameter Condition Min. Typ. Max. Units
Power Good Threshold Hysteresis 7 %
Power Good Pull-Down VSNS = 90% VNOMINAL, IPG = 1mA 60 200 mV
Enable Threshold Turn-On 0.5 0.8 1.2 V
Enable Hysteresis 70 mV
Enable Input Current 0.1 2 µA
Overtemperature Shutdown 160 °C
Overtemperature Shutdown Hysteresis 20 °C
SW Pull-Down Resistance
(MIC33264 only) VEN = 0V 180 Ω
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 5 Revision 2.1
Typical Characteris tics
0
10
20
30
40
50
60
70
80
90
100
10 100 1000
EFFICENCY (%)
OUTPUT CURRENT (mA)
Efficiency
vs. Output Current
V
OUT
= 1.2V
V
IN
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
10
20
30
40
50
60
70
80
90
100
10 100 1000
EFFICIENCY (%)
OUTPUT CURRENT(mA)
Efficiency
vs. Output Current
V
IN
= 5V
V
OUT
= 1.8V
V
OUT
=2.5V
V
OUT
= 3.3V
V
OUT
= 1.2V
1
10
100
1000
10000
100000
1000000
100 1000 10000 100000 1000000
RISE TIME (µs)
CSS (pF)
VOUT Rise Time
vs. CSS
V
IN
= 3.6V
2.6
2.8
3
3.2
3.4
3.6
3.8
4
2.5 33.5 44.5 55.5
CURRENT LIMIT (A)
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
V
OUT = 2.4V
0
5
10
15
20
25
30
35
40
45
2.5 33.5 44.5 55.5
IQ (µA )
VIN (V)
Quiscent Current
vs. Input Voltage
V
OUT
= 2V
NO LOAD
0
5
10
15
20
25
30
35
-40 -20 020 40 60 80 100 120
IQ (µA)
TEMPERATURE (°C)
Quiscent Current
vs. Temperature
V
IN
= 3.6V
V
OUT
=1.75V
1.999
2
2.001
2.002
2.003
2.004
2.005
2.006
2.5 33.5 44.5 55.5
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Line Regulation
(Light Loads)
150mA
50mA
1.998
2
2.002
2.004
2.006
2.008
2.01
2.012
2.014
2.016
2.018
2.5 33.5 44.5 55.5
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Line Regulation
(High Loads)
500mA
300mA
2A
1.96
1.97
1.98
1.99
2
2.01
2.02
2.03
2.04
2.05
2.06
2.07
2.08
020 40 60 80 100 120 140 160 180 200
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Output Voltage
vs. Output Current (DCM)
V
IN
= 3.6V
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 6 Revision 2.1
Typical Characteristics (Continued)
1.94
1.95
1.96
1.97
1.98
1.99
2
2.01
2.02
2.03
2.04
2.05
2.06
200 400 600 800 1000 1200 1400 1600 1800 2000
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Output Voltage
vs. Output Current (CCM)
VIN = 3.6V
1.65
1.67
1.69
1.71
1.73
1.75
1.77
1.79
1.81
1.83
1.85
-40 -20 020 40 60 80 100 120
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Temperature
V
IN
= 3.6V
82
83
84
85
86
87
88
89
90
91
92
2.5 33.5 44.5 55.5
PG THRESHOLD (% OF VREF)
VIN (V)
PG Threshold
vs. Input Voltage
PG RISING
PG FALLING
2.44
2.46
2.48
2.5
2.52
2.54
2.56
2.58
2.6
-40 -20 020 40 60 80 100 120
UVLO THRESHOLD (V)
TEMPERATURE (°C)
UVLO Threshold
vs. Temperature
UVLO ON
UVLO OFF
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
-40 -20 020 40 60 80 100 120
ENABLE THRESHOLD (V)
TEMPERATURE (°C)
Enable Threshold
vs. Temperature
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
2.5 33.5 44.5 55.5
ENABLE VOLTAGE (V)
INPUT VOLTAGE (V)
Enable Thresholds
vs. Input Voltage
C
FF
=1nF
T
CASE
= 25°C
1
10
100
1000
10000
110 100 1000 10000
SW FREQUENCY (KHz)
OUTPUT CURRENT (mA)
Switching Frequency
vs. Output Current
V
IN
= 3.6V
V
IN
= 5V
V
OUT
= 2V
0.68
0.685
0.69
0.695
0.7
0.705
0.71
0.715
0.72
-40 -20 020 40 60 80 100 120
FEEDBACK VOLTAGE (V)
TEMPERATURE (°C)
Feedback Voltage
vs. Temperature
V
IN
= 3.6V
V
OUT
= 1.75V
I
OUT
= 30mA
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
-40 -20 020 40 60 80 100 120
SHUTDOWN CURRENT (µA)
TEMPERATURE (°C)
Shutdown Current
vs. Temperature
VIN = 3.6V
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 7 Revision 2.1
Functional Characteristics
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 8 Revision 2.1
Functional Characteristics (Continued)
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 9 Revision 2.1
Functional Characteristics (Continued)
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 10 Revision 2.1
Functional Diagram
Figure 1. Simplified MIC33263/4 Functional Block Diagram
−
Adjustable Output Voltage
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 11 Revision 2.1
Functional Description
PVIN
The input supply (PVIN) provides power to the internal
MOSFETs for the switch-mode regulator. The PVIN
operating input voltage range of 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 PVIN
and the power ground (PGND) pin is required. Refer to
the PCB Layout Recommendations section for details.
AVIN
Analog VIN (AVIN) provides power to the internal control
and analog supply circuitry. AVIN must be tied to PVIN.
Careful layout should be considered to ensure that any
high-frequency switching noise caused by PVIN is
reduced before reaching AVIN. A 1µF capacitor as close
to AVIN as possible is recommended. Refer to the PCB
Layout Recommendations section for details.
EN/Shutdown
A logic high signal on the enable pin activates the output
voltage of the device. A log ic low sig nal on th e enabl e pin
deactivates the output and reduces supply current to
0.1µA. W hen disab led the MIC3326 4 switc hes an internal
load of 180Ω on the regulators switch node to discharge
the output. The MIC33263/4 features external soft-start
circuitry adjusted by the soft-start (SS) pin that reduces
in-rush current and prevents the output voltage from
overshooting at start up. Do not leave the EN pin floating.
SW
The switch (SW) connects to the controller end of
integrated inductor. The other end of the inductor is
connected to the VOUT pin. Due to the high-speed
switching on this pin, the switch node should be not be
connected.
VOUT
The output pin (VOUT) connects to the output of
integrated inductor. The output capacitor should be
connected from this pin to PGND as close to the module
as possible. The MIC33263/4 is rated for an output
current of up to 2A . A 2 2µ F c apac itor is r ec om mended for
best performance. Refer to the PCB Layout
Recommendations section for 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 PCB Layout
Recommendations section for details.
PGND
The power ground pin is the ground path for the high
current in PWM mode. The current loop for the power
ground s hould be as sm all as possib le and s eparat e f rom
the analog ground (AGND) loop as applicable. Refer to
the PCB Layout Recommendations section for details.
PG
The power good (PG) pin is an open drain output which
indicates logic high when the output voltage is typically
above 90% of its steady state voltage. A pull-up resistor
of more than 5kΩ should be connected from PG to
VOUT.
SS
The soft-start (SS) pin is used to control the output
voltage ramp-up time. Setting CSS to 1nF sets the start-
up time to the recommended minimum of approximately
575µs. The start-up time can be determined by Equation
1:
SS
3
SS
C)10ln(10250T×××=
Eq. 1
The action of the soft-start capacitor is to control the rise
time of the internal reference voltage between 0% and
100% of its nominal steady-state value.
FB
This is the control input for programming the output
voltage. A res is tor d i vid er n et work is connec ted to this pin
from the output and is compared to the internal 0.7V
reference within the regulation loop.
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 12 Revision 2.1
The output voltage can be programmed between 0.7V
and 5V using Equation 2:
+×= R2
R1
1VV
REF
OUT
Eq. 2
where:
R1 is the top resistor, R2 is the bottom resistor.
Table 1. Example Feedback Resistor Values
VOUT R1 R2
1.2V 215k 301k
1.5V 301k 261k
1.8V 340k 215k
2.5V 274k 107k
3.3V 383k 102k
3.6V 422k 102k
5V 634k 102k
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 13 Revision 2.1
Application Information
The MIC33263/4 is a high-performance DC/DC step-
down regulator offering a small solution size of 4.6mm ×
7mm. Supporting an output current up to 2A inside a tiny
3mm × 2.5mm QFN package, the MIC33263/4 requires
very few external components while meeting today’s
miniature portable electronic device needs. Using the
HyperLight Load® (HLL) switching scheme, the
MIC3326 3/4 is a ble to maintain h igh ef f iciency throu gh out
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 PVIN pin and PGND pin for bypassing. A
TDK C1608X5R0J475M, 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
capacita nce over temper ature, can also bec ome resist ive
at high frequencies. This reduces their ability to filter out
high-f r equency noise.
Output Capacitor
The MIC33263/4 is designed for use with a 22µF 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 lo w equiv alent se ries r esistanc e (ESR) cera m ic
output capacitor such as the TDK
C1608X5R1A226M080AC, size 0603, 22µF ceramic
capacitor is r ecom m ended based up on perfor m ance, 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 MIC33263/4 is designed to be stable with a 22µF
ceramic (X5R) output capacitor. An external feedback
capacitor of 15pF to 68pF is required for optimum
regulation per f ormance.
100% Duty Cycle Low Dropout Operation
The MIC33263/4 enters 100% duty cycle when the input
voltage gets close to the nominal output voltage, in this
case the hig h-side MO SFET switch is turne d on 100% for
one or more cycles. By decreasing the input voltage
further the high-side MOSFET switch turns on
complete ly. In this c ase t he sm all dif ferenc e betw een VIN
and VOUT is determined by RDSON and DCR of the
inductor. This is extremely useful in battery-powered
applications to accomplish longest operation time.
Efficiency Considerations
Efficiency is defined as the amount of useful output
power, divided by the amount of power supplied, as
shown in Equati on 3:
100
IV IV
% Efficiency
ININ
OUTOUT
×
×
×
=
Eq. 3
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 app licatio ns. Reduc ed c urrent dr aw from
a battery increases the device’s operating time and is
critical in hand held devices.
There ar e t wo t ypes of loss es in s w itchi ng c on vert er s ; DC
losses and switching losses. DC losses are simply the
power dissipation of I2R. Power is dissipated in the high
side switch dur i ng the o n cyc le. P o wer loss is equa l to the
high sid e MOSFET RDSON multiplied by the s witch 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 4MHz frequency and
the switching transitions make up the switching losses.
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 HLL mode, the MIC33263/4 is able to maintain high
efficiency at low output currents.
Figure 2. Efficiency under Load
10
20
30
40
50
60
70
80
90
100
10 100 1000
EFFICIENCY (%)
OUTPUT CURRENT(mA)
Efficiency
vs. Output Current
V
IN
= 5V
V
OUT
= 1.8V
V
OUT
=2.5V
V
OUT
= 3.3V
V
OUT
= 1.2V
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 14 Revision 2.1
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.
HyperLight Load® Mode (HLL)
MIC33263/4 uses a minimum on and off time proprietary
control loop (PCL) patented by Micrel called HyperLight
Load® (HLL). 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 t hreshold. 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 com bination between the PMOS
and the NMOS allows the control loop to work in
discontinuous mode for light load operations. In
discontinuous mode, the MIC33263/4 works in pulse
frequency modulation (PFM) to regulate the output. As
the output curren t increases, the off -time decreas es, thus
provides more energy to the output. This switching
scheme improves the efficiency of MIC33263/4 during
light load cur rent s b y only switching wh en it is nee ded . As
the load current increases, the MIC33263/4 goes into
continuous conduction mode (CCM) and switches at a
frequency centered at 4MHz.
As shown in Figure 3, as the output current increases,
the switching frequency also increases until the
MIC33263/4 goes from HLL mode to PWM mode at
approximately 120mA. The MIC33263/4 will switch at a
relatively constant frequency around 4MHz once the
output current is over 220mA.
Figure 3. SW Frequency vs. Output
Emission Charac teris tic of MIC33263/4
The MIC33263/4 integrates switching components in a
single package, so the MIC33263/4 has reduced
emission compared to standard buck regulator with
external MOSFETs and inductors. The radiated EMI
scans for MIC33263/4 are shown in the Functional
Characteristics. The limit on the graph is per EN55022
class B standard.
1
10
100
1000
10000
110 100 1000 10000
SW FREQUENCY (KHz)
OUTPUT CURRENT (mA)
Switching Frequency
vs. Output Current
V
IN
= 3.6V
V
IN
= 5V
V
OUT
= 2V
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 15 Revision 2.1
Typical Application Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1 C1608X5R1A475K080AC TDK(7) 4.7µF, 10V, X5R, Size 0603 1
GRM188R60J475KE19D Murata(8)
C2 C1608X5R1A105K TDK 1µF, 10V, X5R, Size 0603 1
C3 C1005C0G1H102J050BA TDK 1nF, 50V, 0402 1
C4 C1005C0G1H150J050BA TDK 15pF, 50V, 0402 1
GRM1555C1H150JZ01D Murata
C5 C1608X5R1A226M080AC TDK 22µF,10V, X5R, Size 0603 1
R1 CRCW0402301KFKEA Vishay(9) 301kΩ, 1%, 1/16W, Size 0402 1
R2 CRCW0402158K0FKEA Vishay 158kΩ, 1%, 1/16W, Size 0402 1
R3, R4 CRCW0402100KFKEA Vishay 100kΩ, 1%, 1/16W, Size 0402 1
R5 CRCW040249R9FKED Vishay 49.9Ω, 1%, 1/16W, Size 0402 1
U1 MIC33263YGK Micrel, Inc.(10) 4MHz, 2A Buck Regulator with Integrated Inductor and
HyperLight Load 1
MIC33264YGK
Notes:
7. TDK: www.tdk.com.
8. Murata: www.murata.com.
9. Vishay: www.vishay.com.
10. Micrel, Inc.: www.micrel.com.
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 16 Revision 2.1
PCB Layout Recommendations
Top Layer
Bottom Layer
Micrel, Inc.
MIC33263/4
Januar y 2
8, 2015 18 Revision 2.1
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
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Micrel, Inc. is a leading global manufac turer of IC solutions f or the worldwide high
-
perform ance linear and po wer, LAN, and t iming & communicat ions
markets. The Company’s products include advanced mixed
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