MIC2202
High Efficiency 2MHz Synchronous Buck
Converter 1µF Stable PWM Regulator
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2007
1 M9999-031907
General Description
The Micrel MIC2202 is a high efficiency 2MHz PWM
synchronous buck regulator. The fast 2MHz operation
along with a proprietary compensation scheme allows the
smallest possible external components. The MIC2202 can
operate with a 1µF ceramic output capacitor and a small,
low DC-resistance, 2.2µH inductor, reducing system size
and cost while allowing a high level of efficiency.
The MIC2202 operates from 2.3V to 5.5V input and
features internal power MOSFETs that can supply over
600mA of output current with output voltages down to
0.5V. The MIC2202 implements a constant 2MHz pulse-
width-modu-lation (PWM) control scheme which reduces
noise in sensitive RF, audio, and communications
applications. Additionally, the MIC2202 can be
synchronized to an external clock, or multiple MIC2202s
can easily be daisy-chained with the SYNCLOCK feature.
The MIC2202 has a high bandwidth loop (up to 500kHz)
which allows ultra fast transient response times. This is
very useful when powering applications that require fast
dynamic response such as CPU cores and RF circuitry in
high performance cellular phones and PDAs. The
MIC2202 is available in 10-pin MSOP and 10-pin 3mm ×
3mm MLF
®
package options with an operating junction
temperature range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage range: 2.3V to 5.5V
• Output down to 0.5V/600mA
• 2MHz PWM operation
• Stable with 1µF ceramic output capacitor.
• Ultra-fast transient response (up to 500kHz GBW)
• Internal compensation
• All ceramic capacitors
• >95% efficiency
• Fully integrated MOSFET switches
• Easily synchronized to external clock
• SYNCLOCK feature to daisy chain multiple 2202s
• Requires only 4 external components
• 1% line and load regulation
• Logic controlled micropower shutdown
• Thermal shutdown and current limit protection
• 10-pin MSOP and 10-pin 3mm×3mm MLF
®
package
options
• –40°C to +125°C junction temperature range
Applications
• Cellular phones
• PDAs
• 802.11 WLAN power supplies
• FPGA/ASIC power supplies
• Dynamically adjustable power supply for CDMA/W-
CDMA RF power amps
• DSL modems
• Tape drives
___________________________________________________________________________________________________________
Typical Application
10nF
2.2µH V
OUT
3.3V
600mA
V
IN
2.3V to 5.5V
1µF
10k
1.78k
EN
65
1
SYNC_IN
SYNC_OUT
10
9
8
7
2
3
4
Adjustable Output Synchronous Buck Regulator
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 3.3V
OUT
5V
IN
4.2V
IN
L = 2.2µH
C
OUT
=1µF
Micrel, Inc. MIC2202
March 2007
2 M9999-031907
Ordering Information
Part Number Voltage Temperature Rang e Package Lead Finish
MIC2202BMM Adj. –40° to +125°C 10-Pin MSOP Standard
MIC2202BML Adj. –40° to +125°C 10-Pin MLF
®
Standard
MIC2202YMM Adj. –40° to +125°C 10-Pin MSOP Pb-Free
MIC2202YML Adj. –40° to +125°C 10-Pin MLF
®
Pb-Free
Pin Configur ation
EN FB65
1SW
VIN
SYNC_IN
SYNC_OUT
10 GND
GND
GND
BIAS
9
8
7
2
3
4
SW
VIN
SYNC_IN
SYNC_OUT
GND
GND
GND
BIAS
1
2
3
4
10
9
8
7
56
EN FBEP
10-Pin MSOP (MM) 10-Pin MLF
®
(ML)
Pin Description
Pin Number Pin Name Pin Function
1 SW Switch (Output): Internal power MOSFET output switches.
2 VIN Supply Voltage (Input): Requires bypass capacitor to GND.
3 SYNC_IN
SYNC_IN for the MIC2202: Sync the main switching frequency to an external
clock.
4 SYNC_OUT SYNC_OUT an open collector output.
5 EN
A low level EN will power down the device, reducing the quiescent current to
under 1µA.
6 FB
Input to the error amplifier, connect to the external resistor divider network to set
the output voltage.
7 BIAS
Internal circuit bias supply, nominally 2.3V. Must be de-coupled to signal ground
with a 0.01µF capacitor.
8, 9, 10 GND Ground.
EP GND Ground, backside pad.
Micrel, Inc. MIC2202
March 2007
3 M9999-031907
Absolute Maximum Ratings(1)
Supply Voltage (V
IN
).........................................................6V
Output Switch Voltage (V
SW
) ............................................6V
Logic Input Voltage (V
EN
, V
SYNC_IN
).................... V
IN
to –0.3V
Power Dissipation ..................................................... Note 3
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(4)
.................................................................. 2kV
Operating Ratings(2)
Supply Voltage (V
IN
)..................................... +2.3V to +5.5V
Junction Temperature (T
J
) ..................–40°C T
J
+125°C
Package Thermal Resistance
MSOP-10L (θ
JA
)...............................................115°C/W
3x3 MLF-10 (θ
JA
) ...............................................60°C/W
Electrical Characteristics(5)
T
A
= 25°C with V
IN
= 3.5V unless otherwise noted; bold values indicate –40°C< T
J
< +125°C.
Parameter Condition Min Typ Max Units
Supply Voltage Range 2.3 5.5 V
EN = V
IN
; V
FB
= 0.55V (not switching) 350 450 µA Quiescent Current
EN = 0V 0.01 1 µA
MIC2202 [Adjustable] Feedback
Voltage
0.4875 0.5 0.5125 V
Output Voltage Line Regulation V
OUT
< 2V; V
IN
= 2.3V to 5.5V, I
LOAD
= 100mA 0.05 0.5 %
Output Voltage Load Regulation 0mA < I
LOAD
< 500mA 0.1 0.5 %
Bias Regulator Output Voltage 2.2 2.32 2.6 V
Maximum Duty Cycle V
FB
= 0.7V 100 %
Current Limit V
FB
= 0.7V 1 1.8 2.5 A
Switch ON-Resistance V
IN
= 3.5V, I
SW
= 300mA; V
FB
= 0.35V 0.65 0.9
V
IN
= 3.5V, I
SW
= 300mA; V
FB
= 0.55V 0.55 0.75
Enable Input Current 0.01 1 µA
Sync Frequency Range 1.6 2.5 MHz
SYNC_IN Threshold 0.7 1 1.7 V
Sync Minimum Pulse Width 10 ns
SYNC_IN Input Current 1 µA
Oscillator Frequency 1.8 2 2.2 MHz
Enable Threshold 0.5 0.9 1.3 V
Enable Hysteresis 20 mV
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. Absolute maximum power dissipation is limited by maximum junction temperature where P
D(MAX)
= (T
J(MAX)
– T
A
) ÷
JA
.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
5. Specification for packaged product only.
Micrel, Inc. MIC2202
March 2007
4 M9999-031907
Typical Characteristics
0.4950
0.4975
0.5000
0.5025
0.5050
0 0.1 0.2 0.3 0.4 0.5
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Outout Vol tage
vs. Output Current
0.485
0.490
0.495
0.500
0.505
0.510
0.515
-40 -20 0 20 40 60 80 100 120
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output V oltage
vs. Temperature
0
0.5
1.0
1.5
2.0
2.5
0246
V
BIAS
(V)
SUPPLY VOLTAGE (V)
V
BIAS
vs. Supply Voltage
V
FB
=0V
2.302
2.304
2.306
2.308
2.31
2.312
2.314
2.316
2.318
2.320
-40 -20 0 20 40 60 80 100 120
BIAS SUPPLY (V)
TEMPERATURE (°C)
Bias Suppl
y
vs. Temperature
0
50
100
150
200
250
300
350
0123456
I
Q
(µA)
SUPPLY VOLTAGE (V)
Quiescent Current
vs. Supply Voltage
V
FB
=0V
332
334
336
338
340
342
344
346
348
350
352
354
-40 -20 0 20 40 60 80 100 120
I
Q
(µA)
TEMPERATURE (°C)
Quiescent Current
vs. Temperature
V
IN
=3.6V
1.60
1.70
1.80
1.90
2.00
2.10
2.20
2.30
2.40
-40 -20 0 20 40 60 80 100 120
FREQUENCY (MHz)
TEMPERATURE(°C)
Frequency
vs. Temperature
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
2.3 2.8 3.3 3.8 4.3 4.8 5.3
ENABLE THRESHOLD (V)
SUPPLY VOLTAGE (V)
Enable Threshol
d
vs. Supply Voltage
Enable On
Enable Off
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
-40 -20 0 20 40 60 80 100 120
ENABLE THRESHOLD (V)
TEMPERATURE (°C)
Enable Threshol
d
vs. Tempera ture
3.6V
IN
Micrel, Inc. MIC2202
March 2007
5 M9999-031907
Block Diagram
Error
Amplifier SW
C
OUT
V
OUT
FB
EN
BIAS
SYNC_IN
SYNC_OUT
PGND
PWM
Comparator
0.5V
MIC2202
Internal
Supply
Oscillator
Ramp
Generator
V
IN
C
IN
VIN
Driver
MIC2202 Block Diagram
Micrel, Inc. MIC2202
March 2007
6 M9999-031907
Functional Description
VIN
VIN provides power to the output and to the internal bias
supply. The supply voltage range is from 2.3V to 5.5V. A
minimum 1µF ceramic is recommended for bypassing
the input supply.
Enable
The enable pin provides a logic level control of the
output. In the off state, supply current of the device is
greatly reduced (typically <1µA). Also, in the off state,
the output drive is placed in a “tri-stated” condition,
where both the high side P-Channel MOSFET and the
low-side N-Channel are in an off or non-conducting
state. Do not drive the enable pin above the supply
voltage.
Sync_In
Sync_In pin enables the ability to change the funda-
mental switching frequency. The Sync_In frequency has
a minimum frequency of 1.6MHz and a maximum sync
frequency of 2.5MHz.
Careful attention should be paid to not driving the
Sync_In pin greater than the supply voltage. While this
will not damage the device, it can cause improper
operation.
Sync_Out
Sync_Out is an open collector output that provides a
signal equal to the internal oscillator frequency. This
creates the ability for multiple MIC2202s to be connected
together in a master-slave configuration for frequency
matching of the converters. A typical 10k is
recommended for a pull-up resistor.
Bias
The bias supply is an internal 2.3V linear regulator that
supplies the internal biasing voltage to the MIC2202. A
10nF ceramic capacitor is required on this pin for
bypassing. Do not use the bias pin as a supply. The bias
pin was designed to supply internal power only.
Feedback
The feedback pin provides the control path to control the
output. A resistor divider connecting the feedback to the
output is used to adjust the desired output voltage. Refer
to the feedback section in the “Applications Information”
for more detail.
SYNC_IN
VIN
MIC2202
“Master”
SYNC_OUT
SW
BIAS
FB
SYNC_IN
VIN
MIC2202
“Slave”
SYNC_OUT
SW
BIAS
FB
Figure 1. Master-Slave Operation
Micrel, Inc. MIC2202
March 2007
7 M9999-031907
Application Information
Input Capacitor
A minimum 1µF ceramic is recommended on the VIN pin
for bypassing. X5R or X7R dielectrics are recommended
for the input capacitor. Y5V dielectrics, aside from losing
most of their capacitance over temperature, they also
become resistive at high frequencies. This reduces their
ability to filter out high frequency noise.
Output Capacitor
The MIC2202 was designed specifically for the use of a
1µF ceramic output capacitor. This value can be
increased to improve transient performance. Since the
MIC2202 is voltage mode, the control loop relies on the
inductor and output capacitor for compensation. For this
reason, do not use excessively large output capacitors.
The output capacitor requires either an X7R or X5R
dielectric. Y5V and Z5U dielectric capacitors, aside from
the undesirable effect of their wide variation in
capacitance over temperature, become resistive at high
frequencies. Using Y5V or Z5U capacitors will cause
instability in the MIC2202.
Total output capacitance should not exceed 15µF. Large
values of capacitance can cause current limit to engage
during start-up. If larger than 15µF is required, a feed-
forward capacitor from the output to the feedback node
should be used to slow the start up time.
Inductor Selection
Inductor selection will be determined by the following
(not necessarily in the order of importance):
• Inductance
• Rated current value
• Size requirements
• DC resistance (DCR)
The MIC2202 is designed for use with a 1µH to 4.7µH
inductor.
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% 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 that
the peak current will not saturate the inductor.
The size requirements refer to the area and height
requirements that are necessary to fit a particular
design. Please refer to the inductor dimensions on their
datasheet.
DC resistance is also important. While DCR is inversely
proportional to size, DCR can represent a significant
efficiency loss. Refer to the “Efficiency Considerations”
below for a more detailed description.
Bias Capacitor
A small 10nF ceramic capacitor is required to bypass the
bias pin. The use of low ESR ceramics provides
improved filtering for the bias supply.
Efficiency Considerations
Efficiency is defined as the amount of useful output
power, divided by the amount of power consumed.
Efficiency % =
100
IV
IV
ININ
OUTOUT
×
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
×
×
Maintaining high efficiency serves two purposes. It
reduces power dissipation in the power supply, reducing
the need for heat sinks and thermal design considera-
tions and it reduces consumption of current for battery
powered applications. Reduced current draw from a
battery increases the devices operating time, critical in
hand held devices.
There are two loss terms in switching converters: DC
losses and switching losses. DC losses are simply the
power dissipation of I
2
R. Power is dissipated in the high
side switch during the on cycle. Power loss is equal to
the high side MOSFET RDS
(ON)
multiplied by the Switch
Current
2
. 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
is another DC loss. The current required to drive the
gates on and off at a constant 2MHz frequency and the
switching transitions make up the switching losses.
Figure 2 shows an efficiency curve. The non-shaded
portion, from 0mA to 200mA, efficiency losses are
dominated by quiescent current losses, gate drive and
transition losses. In this case, lower supply voltages
yield greater efficiency in that they require less current to
drive the MOSFETs and have reduced input power
consumption.
50
55
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
3.3V
OUT
4.2V
IN
5V
IN
Efficienc
y
vs. Output Current
Figure 2. Efficiency Curve
Micrel, Inc. MIC2202
March 2007 8
M9999-031907
The shaded region, 200mA to 500mA, efficiency loss is
dominated by MOSFET RDS
(ON)
and inductor DC losses.
Higher input supply voltages will increase the Gate-to-
Source threshold on the internal MOSFETs, reducing the
internal RDS
(ON)
. 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;
LPD = IOUT2 × DCR
From that, the loss in efficiency due to inductor
resistance can be calculated as follows:
Efficiency Loss =
100
LIV
IV
1
PDOUTOUT
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.
Alternatively, under lighter loads, the ripple current due
to the inductance becomes a significant factor. When
light load efficiencies become more critical, a larger
inductor value maybe desired. Larger inductances
reduce the peak-to-peak ripple current which minimize
losses. The following graph illustrates the effects of
inductance value at light load.
0
20
40
60
80
100
0 255075100
EFFICIENCY (%)
OUTPUT CURRENT (mA)
1.8V
OUT
4.7µH
1µH
Efficienc
y
vs. Inductance
2.2µH
Figure 3. Efficiency vs. Inductance
Compensation
The MIC2202 is an internally compensated, voltage
mode buck regulator. Voltage mode is achieved by
creating an internal 2MHz ramp signal and using the
output of the error amplifier to pulse width modulate the
switch node, maintaining output voltage regulation. With
a typical gain bandwidth of 200kHz, the MIC2202 is
capable of extremely fast transient responses.
The MIC2202 is designed to be stable with a 2.2µH
inductor and a 1µF ceramic (X5R) output capacitor.
These values can be interchanged (i.e. 1µH inductor and
a 2.2µF capacitor). The trade off between changing
these values is that with a larger inductor, there is a
reduced peak-to-peak current which yields a greater
efficiency at lighter loads. A larger output capacitor will
improve transient response by providing a larger hold up
reservoir of energy to the output.
Feedback
The MIC2202 provides a feedback pin to adjust the
output voltage to the desired level. This pin connects
internally to an error amplifier. The error amplifier then
compares the voltage at the feedback to the internal
0.5V reference voltage and adjusts the output voltage to
maintain regulation. To calculate the resistor divider
network for the desired output is as follows:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−
=
1
V
V
R1
R2
REF
OUT
Where V
REF
is 0.5V and V
OUT
is the desired output
voltage. A 10k or lower resistor value from the output
to the feedback is recommended. Larger resistor values
require an additional capacitor (feed-forward) from the
output to the feedback. The large high side resistor value
and the parasitic capacitance on the feedback pin
(~10pF) can cause an additional pole in the loop. The
additional pole can create a phase loss at high
frequency. This phase loss degrades transient response
by reducing phase margin. Adding feed-forward
capacitance negates the parasitic capacitive effects of
the feedback pin. A minimum 1000pF capacitor is
recommended for feed-forward capacitance.
Also, large feedback resistor values increase the
impedance, making the feedback node more susceptible
to noise pick-up. A feed-forward capacitor would also
reduce noise pick-up by providing a low impedance path
to the output.
PWM Operation
The MIC2202 is a pulse width modulation (PWM)
controller. By controlling the ratio of on-to-off time, or
duty cycle, a regulated DC output voltage is achieved.
As load or supply voltage changes, so does the duty
cycle to maintain a constant output voltage. In cases
where the input supply runs into a dropout condition, the
MIC2202 will run at 100% duty cycle.
The MIC2202 provides constant switching at 2MHz with
synchronous internal MOSFETs. The internal MOSFETs
include a high-side P-Channel MOSFET from the input
supply to the switch pin and an N-Channel MOSFET
from the switch pin to ground. Since the low-side N-
Channel MOSFET provides the current during the off
cycle, a free wheeling Schottky diode from the switch
node to ground is not required.
Micrel, Inc. MIC2202
March 2007
9 M9999-031907
PWM control provides fixed frequency operation. By
maintaining a constant switching frequency, predictable
fundamental and harmonic frequencies are achieved.
Other methods of regulation, such as burst and skip
modes, have frequency spectrums that change with load
that can interfere with sensitive communication equip-
ment.
Synchronization
Sync_In allows the user to change the frequency from
2MHz up to 2.5MHz or down to 1.6MHz. This allows the
ability to control the fundamental frequency and all the
resultant harmonics. Maintaining a predictable frequency
creates the ability to either shift the harmonics away
from sensitive carrier and IF frequency bands or to
accurately filter out specific harmonic frequencies.
The Sync_Out function pin allows for the ability to be
able to sync up multiple MIC2202s in a “daisy-chain”,
connecting Sync_Out to Sync_In of the other MIC2202.
Synchronizing multiple MIC2202s benefits much in the
same way as syncing up one MIC2202. All regulators
will run at the same fundamental frequency, resulting in
matched harmonic frequencies, simplifying designing for
sensitive communication equipment.
SYNC_IN
VIN
MIC2202
“Master”
SYNC_OUT
SW
BIAS
FB
SYNC_IN
VIN
MIC2202
“Slave”
SYNC_OUT
SW
BIAS
FB
Figure 4. Master-Slave Operation
Figure 5. Master-Slave Synchronization Waveforms
Micrel, Inc. MIC2202
March 2007
10 M9999-031907
MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor
-30
-20
-10
0
10
20
30
40
50
60
70
-108
-72
-36
0
36
72
108
144
180
216
252
1x10
2
1x10
3
1x10
4
1x10
5
1x10
6
1x10
7
GAIN (dB)
PHASE (°)
FREQUENCY (Hz)
Bode Plot
Phase
Gain
5V
IN
1.8V
OUT
L=1µH
C = 2.2µF
-30
-20
-10
0
10
20
30
40
50
60
70
-108
-72
-36
0
36
72
108
144
180
216
252
1x10
2
1x10
3
1x10
4
1x10
5
1x10
6
1x10
7
GAIN (dB)
PHASE (°)
FREQUENCY (Hz)
Bode Plot
Phase
Gain
5V
IN
1.8V
OUT
L=1µH
C = 2.2µF
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 3.3
V
OUT
5V
IN
4.2V
IN
L = 2.2µH
C
OUT
=1µF
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 2.5V
OUT
3.6V
IN
3V
IN
L = 2.2µH
C
OUT
=1µF
4.2V
IN
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.8V
OUT
3.6V
IN
3V
IN
L = 2.2µH
C
OUT
=1µF
4.2V
IN
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.5V
OUT
3.6V
IN
3V
IN
L = 2.2µH
C
OUT
=1µF
4.2V
IN
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.2V
OUT
3.6V
IN
3V
IN
L = 2.2µH
C
OUT
=1µF
4.2V
IN
Micrel, Inc. MIC2202
March 2007
11 M9999-031907
MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor
V
IN
MIC2202BMM
EN
SYNC_OUT
VIN VSW
BIAS
SYNC_IN
FB
GND
C2
0.01µF
GND
2
5
4
3
7
GND
C3
1µF
C1
1µF
V
OUT
600mA
GND
1
6
10
9
8
L1
2.2µH
R1
10k
R2
see BOM
for values
GND
Figure 6. MIC2202BMM Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
06036D105MAT2 AVX
(1)
C1, C3 GRM185R60J105KE21D Murata
(2)
1µF Ceramic Capacitor X5R, 6.3V, Size 0603 2
0201ZD103MAT2 AVX
(1)
10nF Ceramic Capacitor 6.3V, Size 0201
C2 GRM033R10J103KA01D Murata
(2)
10nF Ceramic Capacitor 6.3V, Size 0202 1
LQH32CN2R2M53K Murata
(2)
2.2µH Inductor 97m (3.2mmx2.5mmx1.55mm)
L1 CDRH2D14-2R2 Sumida
(3)
2.2µH Inductor 94m (3.2mmx3.2mmx1.55mm) 1
R1 CRCW04021002F Vishay-Dale
(4)
10k 1%, Size 0402 1
CRCW04021781F 1.78k 1%, Size 0402 For 3.3V
OUT
CRCW04022491F 2.49k 1%, Size 0402 For 2.5V
OUT
CRCW04023831F 3.83k 1%, Size 0402 For 1.8V
OUT
CRCW04024991F 4.99k 1%, Size 0402 For 1.5V
OUT
CRCW04027151F 7.15k 1%, Size 0402 For 1.2V
OUT
CRCW04021002F
Vishay-Dale
(4)
10k 1%, Size 0402 For 1V
OUT
R2
N/A Open For 0.5V
OUT
1
U1 MIC2202BMM Micrel, Inc.
(5)
2MHz High Efficiency Synchronous Buck Regulator 1
Notes:
1. AVX: www.avx.com
2. Murata: www.murata.com
3. Sumida: www.sumida.com
4. Vishay-Dale: www.vishay.com
5. Micrel, Inc.: www.micrel.com
Micrel, Inc. MIC2202
March 2007
12 M9999-031907
MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor
-30
-20
-10
0
10
20
30
40
50
60
70
-108
-72
-36
0
36
72
108
144
180
216
252
1x10
2
1x10
3
1x10
4
1x10
5
1x10
6
1x10
7
GAIN (dB)
PHASE (°)
FREQUENCY (Hz)
Bode Plot
Phase
Gain
5V
IN
1.8V
OUT
L=1µH
-30
-20
-10
0
10
20
30
40
50
60
70
-108
-72
-36
0
36
72
108
144
180
216
252
1x10
2
1x10
3
1x10
4
1x10
5
1x10
6
1x10
7
GAIN (dB)
PHASE (°)
FREQUENCY (Hz)
Bode Plot
Phase
Gain
3.6V
IN
1.8V
OUT
L=1µH
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 3.3
V
OUT
5V
IN
4.2V
IN
L=1µH
C
OUT
=2.2µF
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 2.5V
OUT
4.2V
IN
3V
IN
L=1µH
C
OUT
=2.2µF
3.6V
IN
40
45
50
55
60
65
70
75
80
85
90
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.8VOUT
3.6V
IN
3V
IN
L=1µH
C
OUT
=2.2µF
4.2V
IN
40
45
50
55
60
65
70
75
80
85
90
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.5VOUT
3.6V
IN
3V
IN
L=1µH
C
OUT
=2.2µF
4.2V
IN
40
45
50
55
60
65
70
75
80
85
90
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.2VOUT
4.2V
IN
3V
IN
L=1µH
C
OUT
=2.2µF
3.6V
IN
Micrel, Inc. MIC2202
March 2007
13 M9999-031907
MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor
V
IN
MIC2202BMM
EN
SYNC_OUT
VIN VSW
BIAS
SYNC_IN
FB
GND
C2
0.01µF
GND
2
5
4
3
7
GND
C3
2.2µF
C1
1µF
V
OUT
600mA
GND
1
6
10
9
8
L1
1µH
R1
10k
R2
see BOM
for values
GND
Figure 7. MIC2202BMM Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
06036D105MAT2 AVX
(1)
C1 GRM185R60J105KE21D Murata
(2)
1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1
0201ZD103MAT2 AVX
(1)
10nF Ceramic Capacitor 6.3V, Size 0201
C2 GRM033R10J103KA01D Murata
(2)
10nF Ceramic Capacitor 6.3V, Size 0202 1
06036D225MAT2 AVX
(1)
C3 GRM033R10J103KA01D Murata
(2)
2.2µF Ceramic Capacitor X5R, 6.3V, Size 0603 1
LQH32CN1R0M53K Murata
(2)
1µH Inductor 60m (3.2mmx2.5mmx1.55mm)
L1 CDRH2D14-2R2 Sumida
(3)
1.5µH Inductor 63m (3.2mmx3.2mmx1.55mm) 1
R1 CRCW04021002F Vishay-Dale
(4)
10k 1%, Size 0402 1
CRCW04021781F 1.78k 1%, Size 0402 For 3.3V
OUT
CRCW04022491F 2.49k 1%, Size 0402 For 2.5V
OUT
CRCW04023831F 3.83k 1%, Size 0402 For 1.8V
OUT
CRCW04024991F 4.99k 1%, Size 0402 For 1.5V
OUT
CRCW04027151F 7.15k 1%, Size 0402 For 1.2V
OUT
CRCW04021002F
Vishay-Dale
(4)
10k 1%, Size 0402 For 1V
OUT
R2
N/A Open For 0.5V
OUT
1
U1 MIC2202BMM Micrel, Inc.
(5)
2MHz High Efficiency Synchronous Buck Regulator 1
Notes:
1. AVX: www.avx.com
2. Murata: www.murata.com
3. Sumida: www.sumida.com
4. Vishay-Dale: www.vishay.com
5. Micrel, Inc.: www.micrel.com
Micrel, Inc. MIC2202
March 2007
14 M9999-031907
MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor
-30
-20
-10
0
10
20
30
40
50
60
70
-108
-72
-36
0
36
72
108
144
180
216
252
1x10
2
1x10
3
1x10
4
1x10
5
1x10
6
1x10
7
GAIN (dB)
PHASE (°)
FREQUENCY (Hz)
Bode Plot
Phase
Gain
5V
IN
1.8V
OUT
L = 4.7µH
-30
-20
-10
0
10
20
30
40
50
60
70
-108
-72
-36
0
36
72
108
144
180
216
252
1x10
2
1x10
3
1x10
4
1x10
5
1x10
6
1x10
7
GAIN (dB)
PHASE (°)
FREQUENCY (Hz)
Bode Plote
Phase
Gain
3.6V
IN
1.8V
OUT
L = 4.7µH
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 3.3
V
OUT
5V
IN
L = 4.7µH
C
OUT
=1µF
4.2V
IN
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 2.5
V
OUT
4.2V
IN
L = 4.7µH
C
OUT
=1µF
3.6V
IN
3V
IN
60
65
70
75
80
85
90
95
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.8VOUT
3V
IN
L = 4.7µH
C
OUT
=1µF
4.2V
IN
3.6V
IN
60
65
70
75
80
85
90
95
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.5VOUT
3.6V
IN
3V
IN
L = 4.7µH
C
OUT
=1µF
4.2V
IN
60
65
70
75
80
85
90
95
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.2VOUT
4.2V
IN
3V
IN
L = 4.7µH
C
OUT
=1µF 3.6V
IN
Micrel, Inc. MIC2202
March 2007
15 M9999-031907
MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor
V
IN
MIC2202BMM
EN
SYNC_OUT
VIN VSW
BIAS
SYNC_IN
FB
GND
C2
0.01µF
GND
2
5
4
3
7
GND
C3
1µF
C1
1µF
V
OUT
600mA
GND
1
6
10
9
8
L1
4.7µH
R1
10k
R2
see BOM
for values
GND
Figure 8. MIC2202BMM Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
06036D105MAT2 AVX
(1)
C1, C3 GRM185R60J105KE21D Murata
(2)
1µF Ceramic Capacitor X5R, 6.3V, Size 0603 2
0201ZD103MAT2 AVX
(1)
10nF Ceramic Capacitor 6.3V, Size 0201
C2 GRM033R10J103KA01D Murata
(2)
10nF Ceramic Capacitor 6.3V, Size 0202 1
LQH32CN4R7M53K Murata
(2)
4.7µH Inductor 150m (3.2mmx2.5mmx1.55mm)
L1 CDRH2D14-4R7 Sumida
(3)
4.7µH Inductor 169m (3.2mmx3.2mmx1.55mm) 1
R1 CRCW04021002F Vishay-Dale
(4)
10k 1%, Size 0402 1
CRCW04021781F 1.78k 1%, Size 0402 For 3.3V
OUT
CRCW04022491F 2.49k 1%, Size 0402 For 2.5V
OUT
CRCW04023831F 3.83k 1%, Size 0402 For 1.8V
OUT
CRCW04024991F 4.99k 1%, Size 0402 For 1.5V
OUT
CRCW04027151F 7.15k 1%, Size 0402 For 1.2V
OUT
CRCW04021002F
Vishay-Dale
(4)
10k 1%, Size 0402 For 1V
OUT
R2
N/A Open For 0.5V
OUT
1
U1 MIC2202BMM Micrel, Inc.
(5)
2MHz High Efficiency Synchronous Buck Regulator 1
Notes:
1. AVX: www.avx.com
2. Murata: www.murata.com
3. Sumida: www.sumida.com
4. Vishay-Dale: www.vishay.com
5. Micrel, Inc.: www.micrel.com
Micrel, Inc. MIC2202
March 2007
16 M9999-031907
MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor
-30
-20
-10
0
10
20
30
40
50
60
70
-108
-72
-36
0
36
72
108
144
180
216
252
1x10
2
1x10
3
1x10
4
1x10
5
1x10
6
1x10
7
GAIN (dB)
PHASE(°)
FREQUENCY (Hz)
Bode Plot
Phase
Gain
5V
IN
1.8V
OUT
L=1µH
-30
-20
-10
0
10
20
30
40
50
60
70
-108
-72
-36
0
36
72
108
144
180
216
252
1x10
2
1x10
3
1x10
4
1x10
5
1x10
6
1x10
7
GAIN (dB)
PHASE (°)
FREQUENCY (Hz)
Bode Plot
Phase
Gain
3.6V
IN
1.8V
OUT
L=1µH
50
55
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 3.3
V
OUT
5V
IN
L=1µH
C
OUT
=4.7µF
4.2V
IN
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 2.5
V
OUT
4.2V
IN
L=1µH
C
OUT
=4.7µF
3.6V
IN
3V
IN
40
45
50
55
60
65
70
75
80
85
90
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.8VOUT
3V
IN
L=1µH
C
OUT
=4.7µF
4.2V
IN
3.6V
IN
40
45
50
55
60
65
70
75
80
85
90
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.5
V
OUT
3.6V
IN
3V
IN
L=1µH
C
OUT
=4.7µF
4.2V
IN
40
45
50
55
60
65
70
75
80
85
90
0 0.1 0.2 0.3 0.4 0.5 0.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency 1.2VOUT
4.2V
IN
3V
IN
L=1µH
C
OUT
=4.7µF
3.6V
IN
Micrel, Inc. MIC2202
March 2007
17 M9999-031907
MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor
V
IN
MIC2202BMM
EN
SYNC_OUT
VIN VSW
BIAS
SYNC_IN
FB
GND
C2
0.01µF
GND
2
5
4
3
7
GND
C3
4.7µF
C1
1µF
V
OUT
600mA
GND
1
6
10
9
8
L1
1µH
R1
10k
R2
see BOM
for values
GND
Figure 9. MIC2202BMM Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
06036D105MAT2 AVX
(1)
C1 GRM185R60J105KE21D Murata
(2)
1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1
0201ZD103MAT2 AVX
(1)
10nF Ceramic Capacitor 6.3V, Size 0201
C2 GRM033R10J103KA01D Murata
(2)
10nF Ceramic Capacitor 6.3V, Size 0202 1
06036D475MAT2 AVX
(1)
4.7µF Ceramic Capacitor 4V, Size 0201
C3 GRM033R10J103KA01D Murata
(2)
4.7µF Ceramic Capacitor 6.3V, Size 0202 1
LQH32CN1R0M53K Murata
(2)
1µH Inductor 60m (3.2mmx2.5mmx1.55mm)
L1 CDRH2D14-1R5 Sumida
(3)
1.5µH Inductor 63m (3.2mmx3.2mmx1.55mm) 1
R1 CRCW04021002F Vishay-Dale
(4)
10k 1%, Size 0402 1
CRCW04021781F 1.78k 1%, Size 0402 For 3.3V
OUT
CRCW04022491F 2.49k 1%, Size 0402 For 2.5V
OUT
CRCW04023831F 3.83k 1%, Size 0402 For 1.8V
OUT
CRCW04024991F 4.99k 1%, Size 0402 For 1.5V
OUT
CRCW04027151F 7.15k 1%, Size 0402 For 1.2V
OUT
CRCW04021002F
Vishay-Dale
(4)
10k 1%, Size 0402 For 1V
OUT
R2
N/A Open For 0.5V
OUT
1
U1 MIC2202BMM Micrel, Inc.
(5)
2MHz High Efficiency Synchronous Buck Regulator 1
Notes:
1. AVX: www.avx.com
2. Murata: www.murata.com
3. Sumida: www.sumida.com
4. Vishay-Dale: www.vishay.com
5. Micrel, Inc.: www.micrel.com
Micrel, Inc. MIC2202
March 2007
18 M9999-031907
Package Information
10-Pin MSOP (MM)
10-Pin MFL
®
(ML)
Micrel, Inc. MIC2202
March 2007
19 M9999-031907
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.
© 2004 Micrel, Incorporated.
