MIC2202 Micrel
6
MIC2202
High Efficiency 2MHz Synchronous Buck
Converter 1µF Stable PWM Regulator
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-modulation (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 3mm × 3mm
MLF™-10L package options with an operating junction
temperature range from –40°C to +125°C .
Features
• Input voltage range: 2.3V to 5.5V
• Output down to 0.5V/600mA
• 2MHz PWM operation
• Stable with 1µF ceramic output capcitor.
• 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 3mm×3mm MLF™-10L 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/WCDMA RF power amps
• DSL modems
• Tape drives
Typical Application
V
IN
2.3V to 5.5V
SYNC_IN
SYNC_OUT
EN
2.2µH
1
2
3
4
10
9
8
7
65
10k
10nF
1.78k
1µF
V
OUT
3.3V
600mA
Adjustable Output Synchronous Buck Converter
Micro
LeadFrame and MLF are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2004 1 M9999-052104
Efficiency 3.3V
100
95
90
85
80
75
EFFICIENCY (%)
70
65
60
0 0.1 0.2 0.3 0.4 0.5 0.
4.2V
IN
5V
IN
L = 2.2µH
C
OUT
OUTPUT CURRENT (A)
OUT
= 1µF
MIC2202 Micrel
Ordering Information
Part Number Voltage Temperature Range Package Lead Finish
MIC2202BMM Adjustable –40°C to +125°C 10-pin MSOP-10 Standard
MIC2202BML Adjustable –40°C to +125°C 10-pin MLF™ Standard
MIC2202YMM Adjustable –40°C to +125°C 10-pin MSOP-10 Pb-Free
MIC2202YML Adjustable –40°C to +125°C 10-pin MLF™ Pb-Free
Pin Configuration
VIN
SYNC_IN
SYNC_OUT
EN FB65
1SW
2
3
4
10 GND
GND
9
GND
8
BIAS
7
MSOP-10 (MM)
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
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
6 FB Input to the error amplifier, connect to the external resistor divider network to
7 BIAS Internal circuit bias supply, nominally 2.3V. Must be de-coupled to signal
8, 9, 10 GND Ground.
EP GND Ground, backside pad.
SYNC_OUT
external clock.
under 1µA.
set the output voltage.
ground with a 0.01µF capacitor.
SW
VIN
SYNC_IN
EN FBEP
1
2
3
4
56
10
GND
GND
9
GND
8
BIAS
7
MLF™-10 (ML)
(Top View)
M9999-052104 2 May 2004
MIC2202 Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (VIN) .......................................................6V
Output Switch Voltage (V
Logic Input Voltage (V
) ..........................................6V
SW
EN
, V
SYNC_IN
)............... VIN to –0.3V
Power Dissipation .................................................... Note 3
Storage Temperature (T
) ....................... –65°C to +150°C
S
Operating Ratings
Supply Voltage (VIN) ................................... +2.3V to +5.5V
Junction Temperature (T
Package Thermal Resistance
MSOP-10L (θ
3mm×3mm MLF™-10L (θJA)...............................60°C/W
)................................................115°C/W
JA
(Note 2)
) ................ –40°C ≤ TJ ≤ +125°C
J
ESD Rating (Note 4) .....................................................2kV
Electrical Characteristics
TA = 25°C with VIN = 3.5V unless otherwise noted, bold values indicate –40°C < TJ < +125°C
Parameter Condition Min Typ Max Units
Supply Voltage Range 2.3 5.5 V
Quiescent Current EN = VIN; VFB = 0.55V (not switching) 350 450 µA
MIC2202 [Adjustable] Feedback 0.4875 0.500 0.5125 V
Voltage
Output Voltage Line Regulation V
Output Voltage Load Regulation 0mA < I
Bias Regulator Output Voltage 2.2 2.32 2.6 V
Maximum Duty Cycle VFB = 0.7V 100 %
Current Limit VFB = 0.7V 1 1.8 2.5 A
Switch ON-Resistance VIN = 3.5V, ISW = 300mA VFB = 0.35V 0.650 0.9 Ω
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 20 °C
Hysteresis
(Note 5)
EN = 0V 0.01 1 µA
< 2V; VIN = 2.3V to 5.5V, I
OUT
< 500mA 0.1 0.5 %
LOAD
VIN = 3.5V, ISW = –300mA VFB = 0.55V 0.550 0.75 Ω
= 100mA 0.05 0.5 %
LOAD
Note 1. Exceeding the ABSOLUTE MAXIMUM RATINGS may damage device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Absolute maximum power dissipation is limited by maximum junction temperature where P
Note 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 5. Specification for packaged product only.
D(MAX)
= (T
J(MAX)–TA
) ÷ θJA.
May 2004 3 M9999-052104
MIC2202 Micrel
6
)
Typical Characteristics
Output Voltage
0.5050
0.5025
0.5000
0.4975
OUTPUT VOLTAGE (V)
0.4950
2.320
2.318
2.316
2.314
2.312
2.31
2.308
BIAS SUPPLY (V)
2.306
2.304
2.302
vs. Output Current
0 0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
Bias Supply
vs. Temperature
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Output Voltage
0.515
0.510
0.505
0.500
0.495
0.490
OUTPUT VOLTAGE (V)
0.485
(µA)
Q
I
vs. Temperature
-40-200 20406080100120
TEMPERATURE (°C)
Quiescent Current
vs. Supply Voltage
350
300
250
200
150
100
50
0
0123456
SUPPLY VOLTAGE (V)
VFB = 0V
V
BIAS
vs. Supply Voltage
2.5
2.0
1.5
(V)
BIAS
1.0
V
0.5
0
024
SUPPLY VOLTAGE (V
Quiescent Current
vs. Temperature
354
352
350
348
346
344
(µA)
342
Q
I
340
338
336
334
332
-40 -20 0 20 40 60 80 100120
TEMPERATURE (°C)
VFB = 0V
VIN= 3.6V
Frequency
2.40
2.30
2.20
2.10
2.00
1.90
1.80
FREQUENCY (MHz)
1.70
1.60
vs. Temperature
-40 -20 0 20 40 60 80 100120
TEMPERATURE (°C)
Enable Threshold
vs. Supply Voltage
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
ENABLE THRESHOLD (V)
0.1
0
2.3 2.8 3.3 3.8 4.3 4.8 5.3
SUPPLY VOLTAGE (V)
Enable On
Enable Off
Enable Threshold
vs. Temperature
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
ENABLE THRESHOLD (V)
0.1
0
-40 -20 0 20 40 60 80 100120
TEMPERATURE (°C)
3.6V
IN
M9999-052104 4 May 2004
MIC2202 Micrel
Block Diagram
V
IN
C
IN
SYNC_OUT
VIN
SYNC_IN
BIAS
EN
Internal
Supply
FB
Oscillator
Ramp
Generator
0.5V
PWM
Error
Amplifier
Comparator
MIC2202 Block Diagram
Driver
MIC2202
PGND
SW
V
OUT
C
OUT
May 2004 5 M9999-052104
MIC2202 Micrel
Functional Description
V
IN
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 fundamental
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 10kΩ 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.
MIC2202
“Master”
VIN
10kΩ
SYNC_IN
SYNC_OUT
VIN
SYNC_IN
SYNC_OUT
SW
BIAS
FB
MIC2202
“Slave”
SW
BIAS
FB
Figure 1. Master-Slave Operation
M9999-052104 6 May 2004
MIC2202 Micrel
Applications 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
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”
below
Efficiency Considerations
Efficiency is defined as the amount of useful output power,
divided by the amount of power consumed.
Efficiency %
VI
OUT OUT
=
VI
IN IN
×
×
×
100
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, 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
multiplied by the Switch Current2. During
(ON)
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.
Efficiency
vs. Output Current
100
95
90
4.2V
85
80
75
70
65
EFFICIENCY (%)
60
55
50
IN
0 0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT (A)
5V
IN
3.3V
OUT
Figure 2. Efficiency Curve
The shaded region, 200mA to 500mA, efficiency loss is
dominated by MOSFET RDS
and inductor DC losses.
(ON)
Higher input supply voltages will increase the Gate-to-Source
threshold on the internal MOSFETs, reducing the internal
RDS
. This improves efficiency by reducing DC losses in
(ON)
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;
L I DCR
PD
2
=×
OUT
From that, the loss in efficiency due to inductor resistance can
be calculated as follows:
May 2004 7 M9999-052104
MIC2202 Micrel
PD
100
×
Efficiency Loss 1–
=
VI
×
OUT OUT
VIL
×+
OUT OUT
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 may
be 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.
Efficiency
100
EFFICIENCY (%)
vs. Inductance
4.7µH
80
60
40
20
0
2.2µH
0 25 50 75 100
OUTPUT CURRENT (mA)
1µH
1.8V
OUT
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:
R2
Where V
REF
R1
=
V
OUT
V
REF
is 0.5V and V
–1
is the desired output voltage.
OUT
A 10kΩ 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 feedforward 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.
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 equipment.
M9999-052104 8 May 2004
MIC2202 Micrel
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.
VIN
10kΩ
SYNC_IN
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.
MIC2202
“Master”
SW
BIAS
SYNC_OUT
MIC2202
VIN
SYNC_IN
SYNC_OUT
FB
“Slave”
SW
BIAS
FB
Figure 4. Master-Slave Operation
Master
Switch Mode
Master
Sync Out
Slave
Switch Mode
TIME (400ns/div.)
Figure 5. Master-Slave Synchronization Waveforms
May 2004 9 M9999-052104
MIC2202 Micrel
6
6
6
6
6
MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor
70
60
50
Bode Plot
Gain
40
30
20
10
GAIN (dB)
5V
0
IN
1.8V
-10
-20
-30
OUT
L = 1µH
C = 2.2µF
2
1x10
1x1031x1041x1051x1061x10
FREQUENCY (Hz)
Efficiency 3.3V
100
95
90
85
80
75
EFFICIENCY (%)
70
65
60
0 0.1 0.2 0.3 0.4 0.5 0.
4.2V
IN
5V
IN
L = 2.2µH
C
OUT
OUTPUT CURRENT (A)
Phase
OUT
= 1µF
252
216
180
144
108
72
36
0
-36
-72
-108
7
70
60
50
40
30
20
10
PHASE (°)
GAIN (dB)
0
-10
-20
-30
1x10
Bode Plot
Gain
Phase
3.6V
IN
1.8V
OUT
L = 1µH
2
1x1031x1041x1051x1061x10
252
216
180
144
108
72
36
0
-36
-72
-108
7
OUT
V
200mV/div
PHASE (°)
OUT
I
200mA/div
FREQUENCY (Hz)
Efficiency 2.5V
100
EFFICIENCY (%)
3V
95
IN
90
3.6V
85
IN
80
75
70
65
60
0 0.1 0.2 0.3 0.4 0.5 0.
OUT
4.2V
L = 2.2µH
C
= 1µF
OUT
100
95
IN
90
85
80
75
EFFICIENCY (%)
70
65
60
0 0.1 0.2 0.3 0.4 0.5 0.
OUTPUT CURRENT (A)
Load Transient
TIME (40µs/div.)
Efficiency 1.8V
3V
IN
4.2V
IN
OUTPUT CURRENT (A)
3.6V
OUT
IN
L = 2.2µH
C
= 1µF
OUT
L = 2.2µH
C = 1µF
= 3.6V
V
IN
= 1.8V
V
OUT
Efficiency 1.5V
100
95
90
85
80
75
EFFICIENCY (%)
70
65
60
3V
IN
L = 2.2µH
C
OUT
= 1µF
3.6V
0 0.1 0.2 0.3 0.4 0.5 0.
OUTPUT CURRENT (A)
OUT
4.2V
Efficiency 1.2V
100
95
90
IN
85
80
75
EFFICIENCY (%)
IN
70
65
60
3V
IN
L = 2.2µH
C
= 1µF
OUT
0 0.1 0.2 0.3 0.4 0.5 0.
3.6V
OUT
4.2V
IN
Vsw-Vripple
L = 2.2µH
C = 1µF
V
= 3.6V
IN
V
= 1.8V
OUT
I
= 600mA
IN
SW
V
2V/div
OUT
V
20mV/div
OUT
OUTPUT CURRENT (A)
TIME (400ns/div.)
M9999-052104 10 May 2004
MIC2202 Micrel
MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor
L1
V
IN
2.2µH
V
OUT
600mA
MIC2202BMM
C3
1µF
R1
10k
R2
see BOM
for values
GND
GND
C1
1µF
2
VIN
5
EN
4
SYNC_OUT
3
SYNC_IN
7
BIAS
C2
0.01µF
VSW
FB
GND
GND
GND
1
6
10
9
8
Figure 6. MIC2202BMM Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1, C3 06036D105MAT2 AVX 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 2
GRM185R60J105KE21D Murata 1uF Ceramic Capacitor X5R, 6.3V, Size 0603
C2 0201ZD103MAT2 AVX 10nF Cermaic Capacitor 6.3V, Size 0201 1
GRM033R10J103KA01D Murata 10nF Cermaic Capacitor 6.3V, Size 0202
L1 LQH32CN2R2M53K Murata 2.2uH Inductor 97mΩ (3.2mmx2.5mmx1.55mm) 1
CDRH2D14-2R2 Sumida 2.2uH Inductor 94mΩ (3.2mmx3.2mmx1.55mm)
R1 CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402
R2 CRCW04021781F Vishay-Dale 1.78kΩ 1%, Size 0402 For 3.3V
CRCW04022491F Vishay-Dale 2.49kΩ 1%, Size 0402 For 2.5V
CRCW04023831F Vishay-Dale 3.83kΩ 1%, Size 0402 For 1.8V
CRCW04024991F Vishay-Dale 4.99kΩ 1%, Size 0402 For 1.5V
CRCW04027151F Vishay-Dale 7.15kΩ 1%, Size 0402 For 1.2V
CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 For 1V
N/A Open For 0.5V
U1 MIC2202BMM Micrel, Inc. 2MHz High Efficiency Synchronous 1
Buck Regulator
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
OUT
OUT
OUT
OUT
OUT
OUT
OUT
1
May 2004 11 M9999-052104
MIC2202 Micrel
6
6
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)
6
6
MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor
70
60
50
Bode Plot
Gain
40
30
20
10
GAIN (dB)
0
5V
-10
IN
1.8V
-20
-30
OUT
L = 1µH
2
1x10
1x1031x1041x1051x1061x10
FREQUENCY (Hz)
Efficiency 3.3V
100
4.2V
IN
95
90
85
80
75
EFFICIENCY (%)
70
65
60
0 0.1 0.2 0.3 0.4 0.5 0.
5V
IN
L = 1µH
C
OUT
OUTPUT CURRENT (A)
Phase
OUT
= 2.2µF
252
216
180
144
108
72
36
0
-36
-72
-108
7
70
60
50
40
30
20
10
PHASE (°)
GAIN (dB)
0
-10
-20
-30
1x10
Bode Plot
Gain
Phase
3.6V
IN
1.8V
OUT
L = 1µH
2
1x1031x1041x1051x1061x10
252
216
180
144
108
72
36
0
-36
-72
-108
7
OUT
V
200mV/div
PHASE (°)
OUT
I
200mA/div
FREQUENCY (Hz)
100
95
Efficiency 2.5V
3V
IN
OUT
90
85
80
75
EFFICIENCY (%)
70
4.2V
3.6V
IN
IN
L = 1µH
C
= 2.2µF
OUT
4.2V
65
60
0 0.1 0.2 0.3 0.4 0.5 0.
Load Transient
TIME (40µs/div.)
Efficiency 1.8V
3V
IN
3.6V
IN
L = 1µH
C
OUT
OUT
IN
= 2.2µF
L = 2.2µH
C = 1µF
= 3.6V
V
IN
= 1.8V
V
OUT
OUTPUT CURRENT (A)
90
3V
IN
85
Efficiency 1.5V
OUT
80
75
70
65
4.2V
IN
3.6V
60
55
EFFICIENCY (%)
50
45
40
0 0.1 0.2 0.3 0.4 0.5 0.
L = 1µH
C
= 2.2µF
OUT
OUTPUT CURRENT (A)
90
3V
IN
85
Efficiency 1.2V
OUT
4.2V
IN
80
75
70
IN
65
60
55
EFFICIENCY (%)
50
45
40
0 0.1 0.2 0.3 0.4 0.5 0.
3.6V
L = 1µH
C
= 2.2µF
OUT
IN
SW
V
2V/div
OUT
V
20mV/div
OUTPUT CURRENT (A)
Vsw-Vripple
TIME (400ns/div.)
M9999-052104 12 May 2004
L = 2.2µH
C = 1µF
V
= 3.6V
IN
V
= 1.8V
OUT
I
= 600mA
OUT
MIC2202 Micrel
MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor
V
IN
GND
C1
1µF
MIC2202BMM
2
VIN
5
EN
4
SYNC_OUT
3
SYNC_IN
7
BIAS
C2
0.01µF
VSW
FB
GND
GND
GND
L1
1µH
1
6
10
9
8
C3
2.2µF
V
OUT
600mA
R1
10k
R2
see BOM
for values
GND
Figure 7. MIC2202BMM Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1 06036D105MAT2 AVX 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1
GRM185R60J105KE21D Murata 1µF Ceramic Capacitor X5R, 6.3V, Size 0603
C2 0201ZD103MAT2 AVX 10nF Cermaic Capacitor 6.3V, Size 0201 1
GRM033R10J103KA01D Murata 10nF Cermaic Capacitor 6.3V, Size 0202
C3 06036D225MAT2 AVX 2.2µF Ceramic Capacitor X5R, 6.3V, Size 0603 1
GRM033R10J103KA01D Murata 2.2µF Ceramic Capacitor X5R, 6.3V, Size 0603
L1 LQH32CN1R0M53K Murata 1µH Inductor 60mΩ (3.2mmx2.5mmx1.55mm) 1
CDRH2D14-2R2 Sumida 1.5µH Inductor 63mΩ (3.2mmx3.2mmx1.55mm)
R1 CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 1
R2 CRCW04021781F Vishay-Dale 1.78kΩ 1%, Size 0402 For 3.3V
CRCW04022491F Vishay-Dale 2.49kΩ 1%, Size 0402 For 2.5V
CRCW04023831F Vishay-Dale 3.83kΩ 1%, Size 0402 For 1.8V
CRCW04024991F Vishay-Dale 4.99kΩ 1%, Size 0402 For 1.5V
CRCW04027151F Vishay-Dale 7.15kΩ 1%, Size 0402 For 1.2V
CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 For 1V
N/A Open For 0.5V
U1 MIC2202BMM Micrel, Inc. 2MHz High Efficiency Synchronous 1
Buck Regulator
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
OUT
OUT
OUT
OUT
OUT
OUT
OUT
1
May 2004 13 M9999-052104
MIC2202 Micrel
6
6
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)
MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor
70
60
50
40
Bode Plot
Gain
Phase
30
20
10
GAIN (dB)
0
5V
-10
IN
1.8V
OUT
-20
L = 4.7µH
-30
2
1x10
1x1031x1041x1051x1061x10
FREQUENCY (Hz)
Efficiency 3.3V
100
95
90
85
80
EFFICIENCY (%)
75
70
0 0.1 0.2 0.3 0.4 0.5 0.
4.2V
IN
5V
IN
L = 4.7µH
C
OUT
OUTPUT CURRENT (A)
OUT
= 1µF
252
216
180
144
108
72
36
0
-36
-72
-108
7
70
60
50
40
30
20
10
PHASE (°)
GAIN (dB)
0
-10
-20
-30
1x10
Bode Plot
Gain
Phase
3.6V
IN
1.8V
OUT
L = 4.7µH
2
1x1031x1041x1051x1061x10
252
216
180
144
108
72
36
0
-36
-72
-108
7
OUT
V
200mV/div
PHASE (°)
OUT
I
200mA/div
FREQUENCY (Hz)
100
95
Efficiency 2.5V
3V
IN
OUT
90
85
4.2V
IN
80
75
EFFICIENCY (%)
70
3.6V
IN
L = 4.7µH
C
OUT
= 1µF
65
60
0 0.1 0.2 0.3 0.4 0.5 0.
Load Transient
TIME (40µs/div.)
Efficiency 1.8V
3V
IN
L = 4.7µH
C
= 1µF
OUT
OUT
4.2V
3.6V
IN
IN
L = 4.7µH
C = 1µF
= 3.6V
V
IN
= 1.8V
V
OUT
OUTPUT CURRENT (A)
Efficiency 1.5V
95
90
4.2V
OUT
IN
85
80
3V
OUT
= 1µF
IN
3.6V
75
70
L = 4.7µH
EFFICIENCY (%)
C
65
60
0 0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT (A)
IN
Efficiency 1.2V
95
90
85
4.2V
OUT
IN
80
75
70
EFFICIENCY (%)
65
60
3V
IN
L = 4.7µH
C
= 1µF
OUT
3.6V
IN
0 0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT (A)
SW
V
2V/div
OUT
V
20mV/div
L = 4.7µH
C = 1µF
V
V
= 3.6V
IN
V
= 1.8V
OUT
I
= 600mA
OUT
TIME (400ns/div.)
sw-Vripple
M9999-052104 14 May 2004
MIC2202 Micrel
MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor
L1
V
IN
4.7µH
V
OUT
600mA
MIC2202BMM
C3
1µF
R1
10k
R2
see BOM
for values
GND
GND
C1
1µF
2
VIN
5
EN
4
SYNC_OUT
3
SYNC_IN
7
BIAS
C2
0.01µF
VSW
FB
GND
GND
GND
1
6
10
9
8
Figure 8. MIC2202BMM Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1, C3 06036D105MAT2 AVX 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 2
GRM185R60J105KE21D Murata 1uF Ceramic Capacitor X5R, 6.3V, Size 0603
C2 0201ZD103MAT2 AVX 10nF Cermaic Capacitor 6.3V, Size 0201 1
GRM033R10J103KA01D Murata 10nF Cermaic Capacitor 6.3V, Size 0202
L1 LQH32CN4R7M53K Murata 4.7uH Inductor 150mΩ (3.2mmx2.5mmx1.55mm) 1
CDRH2D14-4R7 Sumida 4.7uH Inductor 169mΩ (3.2mmx3.2mmx1.55mm)
R1 CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 1
R2 CRCW04021781F Vishay-Dale 1.78kΩ 1%, Size 0402 For 3.3V
CRCW04022491F Vishay-Dale 2.49kΩ 1%, Size 0402 For 2.5V
CRCW04023831F Vishay-Dale 3.83kΩ 1%, Size 0402 For 1.8V
CRCW04024991F Vishay-Dale 4.99kΩ 1%, Size 0402 For 1.5V
CRCW04027151F Vishay-Dale 7.15kΩ 1%, Size 0402 For 1.2V
CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 For 1V
N/A Open For 0.5V
U1 MIC2202BMM Micrel, Inc. 2MHz High Efficiency Synchronous 1
Buck Regulator
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
OUT
OUT
OUT
OUT
OUT
OUT
OUT
1
May 2004 15 M9999-052104
MIC2202 Micrel
6
6
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)
MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor
70
60
50
40
Bode Plot
Gain
Phase
30
20
10
GAIN (dB)
0
5V
-10
IN
1.8V
OUT
-20
L = 1µH
-30
2
1x10
1x1031x1041x1051x1061x10
FREQUENCY (Hz)
Efficiency 3.3V
100
95
90
85
80
75
70
65
EFFICIENCY (%)
60
55
50
0 0.1 0.2 0.3 0.4 0.5 0.
4.2V
IN
5V
IN
L = 1µH
C
OUT
OUTPUT CURRENT (A)
OUT
= 4.7µF
252
216
180
144
108
72
36
0
-36
-72
-108
7
70
60
50
40
30
20
10
PHASE (°)
GAIN (dB)
0
-10
-20
-30
1x10
Bode Plot
Gain
Phase
3.6V
IN
1.8V
OUT
L = 1µH
2
1x1031x1041x1051x1061x10
252
216
180
144
108
72
36
0
-36
-72
-108
7
OUT
V
200mV/div
PHASE (°)
OUT
I
200mA/div
FREQUENCY (Hz)
100
95
Efficiency 2.5V
3V
IN
OUT
90
85
80
75
EFFICIENCY (%)
70
4.2V
3.6V
IN
IN
L = 1µH
C
= 4.7µF
OUT
Load Transient
TIME (40µs/div.)
Efficiency 1.8V
3.6V
IN
4.2V
IN
L = 1µH
C
OUT
OUT
3V
IN
= 4.7µF
L = 1µH
C = 4.7µF
= 3.6V
V
IN
= 1.8V
V
OUT
65
60
0 0.1 0.2 0.3 0.4 0.5 0.
OUTPUT CURRENT (A)
Efficiency 1.5V
90
85
OUT
4.2V
80
75
70
65
60
55
EFFICIENCY (%)
50
45
40
0 0.1 0.2 0.3 0.4 0.5 0.6
L = 1µH
C
= 4.7µF
OUT
3V
IN
3.6V
IN
OUTPUT CURRENT (A)
IN
Efficiency 1.2V
90
85
OUT
4.2V
80
75
70
65
60
55
EFFICIENCY (%)
50
3V
IN
L = 1µH
C
= 4.7µF
OUT
3.6V
45
40
0 0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT (A)
Vsw-V
ripple
IN
SW
V
IN
2V/div
OUT
V
20mV/div
L = 1µH
C = 4.7µF
V
= 3.6V
IN
V
= 1.8V
OUT
I
= 600mA
OUT
TIME (400ns/div.)
M9999-052104 16 May 2004
MIC2202 Micrel
MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor
L1
V
IN
1µH
V
OUT
600mA
MIC2202BMM
C3
4.7µF
R1
10k
R2
see BOM
for values
GND
GND
C1
1µF
2
VIN
5
EN
4
SYNC_OUT
3
SYNC_IN
7
BIAS
C2
0.01µF
VSW
FB
GND
GND
GND
1
6
10
9
8
Figure 9. MIC2202BMM Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1 06036D105MAT2 AVX 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1
GRM185R60J105KE21D Murata 1µF Ceramic Capacitor X5R, 6.3V, Size 0603
C2 0201ZD103MAT2 AVX 10nF Cermaic Capacitor 6.3V, Size 0201 1
GRM033R10J103KA01D Murata 10nF Cermaic Capacitor 6.3V, Size 0202
C3 06036D475MAT2 AVX 4.7µF Cermaic Capacitor 4V, Size 0201 1
GRM033R10J103KA01D Murata 4.7µF Cermaic Capacitor 6.3V, Size 0202
L1 LQH32CN1R0M53K Murata 1µH Inductor 60mΩ (3.2mmx2.5mmx1.55mm) 1
CDRH2D14-1R5 Sumida 1.5µH Inductor 63mΩ (3.2mmx3.2mmx1.55mm)
R1 CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 1
R2 CRCW04021781F Vishay-Dale 1.78kΩ 1%, Size 0402 For 3.3V
CRCW04022491F Vishay-Dale 2.49kΩ 1%, Size 0402 For 2.5V
CRCW04023831F Vishay-Dale 3.83kΩ 1%, Size 0402 For 1.8V
CRCW04024991F Vishay-Dale 4.99kΩ 1%, Size 0402 For 1.5V
CRCW04027151F Vishay-Dale 7.15kΩ 1%, Size 0402 For 1.2V
CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 For 1V
N/A Open For 0.5V
U1 MIC2202BMM Micrel, Inc. 2MHz High Efficiency Synchronous 1
Buck Regulator
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
OUT
OUT
OUT
OUT
OUT
OUT
OUT
1
May 2004 17 M9999-052104
MIC2202 Micrel
Package Information
3.15 (0.122)
2.85 (0.114)
0.30 (0.012)
0.15 (0.006)
0.50 BSC (0.020)
DIMENSIONS: mm
3.00 BSC.
0.48 typ.
1
2
3
0.20 dia
4.90 BSC (0.193)
3.10 (0.122)
2.90 (0.114)
1.10 (0.043)
0.94 (0.037)
0.15 (0.006)
0.05 (0.002)
10-Pin MSOP (MM)
1.50 BSC.
1.50 BSC.
3.00 BSC.
0.85
0.01
+0.15
–0.05
+0.04
–0.01
6° MAX
0° MIN
0.23
DIMENSIONS:
MM (INCH)
+0.07
–0.05
0.26 (0.010)
0.10 (0.004)
0.70 (0.028)
0.40 (0.016)
1.60
0.80
1
2
3
+0.15
–0.15
+0.15
–0.15
PIN 1 ID
1.15
+0.15
–0.15
2.30
+0.15
–0.15
0.50 BSC.
TOP BOTTOM
TERMINAL TIP
0.50 BSC.
TERMINAL TIP
ODD TERMINAL SIDE EVEN TERMINAL SIDE
SEATING PLANE
0.50 BSC.
0.40
0.23
+0.15
–0.05
+0.07
–0.05
0.01
+0.04
–0.01
10-Pin MLF™ (ML)
MICREL, INC. 1849 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 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
M9999-052104 18 May 2004
Loading...