Micrel MIC2202BMM High efficiency 2mhz synchronous buck converter 1î¼f stable pwm regulator Datasheet

MIC2202
High Efficiency 2MHz Synchronous Buck
Converter 1µF Stable PWM Regulator
General Description
Features
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 pulsewidth-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.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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/WCDMA RF power amps
• DSL modems
• Tape drives
___________________________________________________________________________________________________________
Typical Application
2.2µH
SYNC_IN
SYNC_OUT
EN
1
10
2
9
3
8
4
7
5
6
100
Efficiency 3.3VOUT
4.2VIN
95
10k
EFFICIENCY (%)
VIN
2.3V to 5.5V
VOUT
3.3V
600mA
1µF
10nF
1.78k
90
85
5VIN
80
75
70
L = 2.2µH
COUT = 1µF
65
60
0
Adjustable Output Synchronous Buck Regulator
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
0.6
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
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M9999-031907
Micrel, Inc.
MIC2202
Ordering Information
Part Number
Voltage
Temperature Range
Package
MIC2202BMM
Adj.
–40° to +125°C
10-Pin MSOP
MIC2202BML
Adj.
MIC2202YMM
MIC2202YML
Lead Finish
Standard
®
–40° to +125°C
10-Pin MLF
Standard
Adj.
–40° to +125°C
10-Pin MSOP
Pb-Free
Adj.
–40° to +125°C
10-Pin MLF®
Pb-Free
Pin Configuration
10 GND
SW 1
10 GND
VIN 2
9 GND
VIN 2
9 GND
SYNC_IN 3
8 GND
SYNC_IN 3
8 GND
SYNC_OUT 4
7 BIAS
SYNC_OUT 4
7 BIAS
SW 1
EN 5
EN 5
EP
6 FB
6 FB
10-Pin MLF® (ML)
10-Pin MSOP (MM)
Pin Description
Pin Number
Pin Name
1
SW
Switch (Output): Internal power MOSFET output switches.
Pin Function
2
VIN
Supply Voltage (Input): Requires bypass capacitor to GND.
3
SYNC_IN
4
SYNC_OUT
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.
SYNC_IN for the MIC2202: Sync the main switching frequency to an external
clock.
SYNC_OUT an open collector output.
8, 9, 10
GND
Ground.
EP
GND
Ground, backside pad.
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Micrel, Inc.
MIC2202
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) .........................................................6V
Output Switch Voltage (VSW) ............................................6V
Logic Input Voltage (VEN, VSYNC_IN).................... VIN to –0.3V
Power Dissipation ..................................................... Note 3
Storage Temperature (Ts) .........................–65°C to +150°C
ESD Rating(4) .................................................................. 2kV
Supply Voltage (VIN)..................................... +2.3V to +5.5V
Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C
Package Thermal Resistance
MSOP-10L (θJA) ...............................................115°C/W
3x3 MLF-10 (θJA) ...............................................60°C/W
Electrical Characteristics(5)
TA = 25°C with VIN = 3.5V unless otherwise noted; bold values indicate –40°C< TJ < +125°C.
Parameter
Condition
Min
Typ
Max
5.5
V
EN = VIN; VFB = 0.55V (not switching)
350
450
µA
EN = 0V
0.01
1
µA
0.5
0.5125
V
Supply Voltage Range
Quiescent Current
2.3
MIC2202 [Adjustable] Feedback
Voltage
0.4875
Units
Output Voltage Line Regulation
VOUT < 2V; VIN = 2.3V to 5.5V, ILOAD= 100mA
0.05
0.5
%
Output Voltage Load Regulation
0mA < ILOAD < 500mA
0.1
0.5
%
2.32
2.6
Bias Regulator Output Voltage
2.2
Maximum Duty Cycle
VFB = 0.7V
100
Current Limit
VFB = 0.7V
1
Switch ON-Resistance
V
%
1.8
2.5
A
VIN = 3.5V, ISW = 300mA; VFB = 0.35V
0.65
0.9
Ω
VIN = 3.5V, ISW = 300mA; VFB = 0.55V
0.55
0.75
Ω
0.01
1
µA
2.5
MHz
Enable Input Current
Sync Frequency Range
1.6
SYNC_IN Threshold
0.7
Sync Minimum Pulse Width
1
1.7
10
SYNC_IN Input Current
V
ns
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 PD(MAX) = (TJ(MAX) – TA) ÷ θJA.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
5. Specification for packaged product only.
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MIC2202
Typical Characteristics
0.5000
0.4975
0.5
0.500
0.495
Bias Supply
vs. Temperature
0
0
250
2.312
2.31
2.308
200
IQ
2.314
150
100
2.306
50
2.302
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
ENABLE THRESHOLD (V)
Frequency
vs. Temperature
VF B = 0V
0
1.0
0.9
0.8
0.7
0.6
1
2
3
4
5
SUPPLY VOLTAGE (V)
6
Enable Threshold
vs. Supply Voltage
Enable On
Enable Off
0.5
0.4
0.3
0.2
0.1
0
2.3 2.8 3.3 3.8 4.3 4.8 5.3
SUPPLY VOLTAGE (V)
4
2
4
SUPPLY VOLTAGE (V)
6
Quiescent Current
vs. Temperature
Quiescent Current
vs. Supply Voltage
300
IQ (µA)
BIAS SUPPLY (V)
VF B = 0V
350
2.304
FREQUENCY (MHz)
1.0
0.485
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
2.316
March 2007
1.5
0.5
0.490
2.318
2.40
2.0
0.505
354
352
350
348
346
344
342
340
338
336
334
VIN = 3.6V
332
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0.9
ENABLE THRESHOLD (V)
2.320
0.1
0.2
0.3
0.4
OUTPUT CURRENT (A)
0.510
(µA)
0.4950
0
2.5
V BIAS (V)
0.5025
VBIAS
vs. Supply Voltage
Output Voltage
vs. Temperature
0.515
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
0.5050
Outout Voltage
vs. Output Current
Enable Threshold
vs. Temperature
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
3.6VIN
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
M9999-031907
Micrel, Inc.
MIC2202
Block Diagram
VIN
CIN
SYNC_OUT
Oscillator
Ramp
Generator
SYNC_IN
BIAS
VIN
Internal
Supply
Error
Amplifier
PWM
Comparator
SW
Driver
VOUT
COUT
0.5V
EN
MIC2202
FB
PGND
MIC2202 Block Diagram
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MIC2202
Functional Description
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.
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.
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
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.
MIC2202
“Master”
VIN
SW
BIAS
SYNC_IN
SYNC_OUT
FB
MIC2202
“Slave”
VIN
SW
BIAS
SYNC_IN
SYNC_OUT
FB
Figure 1. Master-Slave Operation
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MIC2202
Application Information
below for a more detailed description.
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.
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.
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 feedforward capacitor from the output to the feedback node
should be used to slow the start up time.
⎛V
×I
Efficiency % = ⎜⎜ OUT OUT
⎝ VIN × IIN
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 I2R. 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
Current2. 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.
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”
March 2007
⎞
⎟⎟ × 100
⎠
100
EFFICIENCY (%)
95
90
85
80
Efficiency
vs. Output Current
4.2VIN
5VIN
75
70
65
60
55
50
0
3.3VOUT
0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT (A)
Figure 2. Efficiency Curve
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MIC2202
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-toSource 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:
⎡ ⎛
VOUT × IOUT
Efficiency Loss = ⎢1 − ⎜⎜
V
⎣⎢ ⎝ OUT × IOUT + L PD
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:
⎞⎤
⎟⎥ × 100
⎟
⎠⎦⎥
R2 =
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.
100
4.7µH
EFFICIENCY (%)
80
1µH
2.2µH
40
20
0
0
1.8VOUT
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 NChannel MOSFET provides the current during the off
cycle, a free wheeling Schottky diode from the switch
node to ground is not required.
25
50
75
100
OUTPUT CURRENT (mA)
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.
March 2007
⎛ VOUT
⎞
⎜⎜
− 1⎟⎟
⎝ VREF
⎠
Where VREF is 0.5V and VOUT is the desired output
voltage. 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 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.
Efficiency
vs. Inductance
60
R1
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Micrel, Inc.
MIC2202
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.
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.
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
MIC2202
“Master”
VIN
SW
BIAS
SYNC_IN
SYNC_OUT
FB
MIC2202
“Slave”
VIN
SW
BIAS
SYNC_IN
SYNC_OUT
FB
Figure 4. Master-Slave Operation
Figure 5. Master-Slave Synchronization Waveforms
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Micrel, Inc.
MIC2202
MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor
50
Phase
60
180
50
144
40
30
108
20
72
10
36
0
-10
-20
5VIN
1.8VOUT
L = 1µH
C = 2.2µF
0
-36
-72
252
216
Gain
Phase
180
144
30
108
20
72
10
0
-10
-20
36
5VIN
1.8VOUT
L = 1µH
C = 2.2µF
0
-36
-72
-30
-108
1x102 1x103 1x104 1x105 1x106 1x107
-30
-108
1x102 1x103 1x104 1x105 1x106 1x107
FREQUENCY (Hz)
FREQUENCY (Hz)
EFFICIENCY (%)
85
100
4.2VIN
95
90
Efficiency 2.5VOUT
Efficiency 3.3V OUT
95
5VIN
80
L = 2.2µH
COUT = 1µF
75
70
65
60
0
3.6VIN
80
L = 2.2µH
COUT = 1µF
75
70
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
60
0
0.6
Efficiency 1.5VOUT
85
80
75
0.6
4.2VIN
3.6VIN
70
65
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
3VIN
90
60
0
L = 2.2µH
COUT = 1µF
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
0.6
Efficiency 1.2VOUT
100
95
95
3VIN
90
EFFICIENCY (%)
EFFICIENCY (%)
95
4.2VIN
65
100
4.2VIN
85
80
75
L = 2.2µH
70 C
OUT = 1µF
65
60
0
3VIN
90
85
Efficiency 1.8VOUT
100
EFFICIENCY (%)
100
EFFICIENCY (%)
GAIN (dB)
40
216
Bode Plot
PHASE (°)
Gain
70
GAIN (dB)
60
252
PHASE (°)
Bode Plot
70
3.6VIN
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
March 2007
3VIN
90
4.2VIN
85
80
75
L = 2.2µH
70 C
OUT = 1µF
3.6VIN
65
0.6
60
0
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
10
0.6
M9999-031907
Micrel, Inc.
MIC2202
MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor
L1
2.2µH
VIN
MIC2202BMM
C1
1µF
2
VOUT
600mA
C3
1µF
1
VIN
VSW
5
EN
FB
4
SYNC_OUT
GND
10
3
SYNC_IN
GND
9
7
BIAS
GND
8
R1
10k
6
R2
see BOM
for values
C2
0.01µF
GND
GND
Figure 6. MIC2202BMM Schematic
Bill of Materials
Item
C1, C3
C2
L1
Part Number
Manufacturer
06036D105MAT2
AVX
GRM185R60J105KE21D
Murata
0201ZD103MAT2
GRM033R10J103KA01D
LQH32CN2R2M53K
R1
CDRH2D14-2R2
CRCW04021002F
Qty.
(2)
1µF Ceramic Capacitor X5R, 6.3V, Size 0603
2
AVX(1)
10nF Ceramic Capacitor 6.3V, Size 0201
(2)
Murata(2)
2.2µH Inductor 97mΩ (3.2mmx2.5mmx1.55mm)
(3)
2.2µH Inductor 94mΩ (3.2mmx3.2mmx1.55mm)
Sumida
Vishay-Dale(4)
1.78kΩ 1%, Size 0402 For 3.3VOUT
2.49kΩ 1%, Size 0402 For 2.5VOUT
Vishay-Dale
CRCW04027151F
7.15kΩ 1%, Size 0402 For 1.2VOUT
CRCW04021002F
10kΩ 1%, Size 0402 For 1VOUT
MIC2202BMM
Open
Micrel, Inc.
1
4.99kΩ 1%, Size 0402 For 1.5VOUT
N/A
U1
1
3.83kΩ 1%, Size 0402 For 1.8VOUT
(4)
(5)
1
10kΩ 1%, Size 0402
CRCW04022491F
CRCW04024991F
1
10nF Ceramic Capacitor 6.3V, Size 0202
Murata
CRCW04021781F
CRCW04023831F
R2
Description
(1)
For 0.5VOUT
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
March 2007
11
M9999-031907
Micrel, Inc.
MIC2202
MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor
Phase
180
50
144
40
30
108
20
72
10
36
0
0
-10
-20
5VIN
1.8VOUT
L = 1µH
-36
-72
252
216
Gain
Phase
180
144
30
108
20
72
10
36
0
-10
-20
0
3.6VIN
1.8VOUT
L = 1µH
-36
-72
-30
-108
1x102 1x103 1x104 1x105 1x106 1x107
-30
-108
1x102 1x103 1x104 1x105 1x106 1x107
FREQUENCY (Hz)
FREQUENCY (Hz)
EFFICIENCY (%)
100
4.2VIN
95
5VIN
80
L = 1µH
COUT = 2.2µF
75
70
65
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
85
75
L = 1µH
COUT = 2.2µF
4.2VIN
70
85
80
4.2VIN
70
65
60
3.6VIN
55
L = 1µH
COUT = 2.2µF
50
45
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
March 2007
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
0.6
75
70
65
3VIN
4.2VIN
3.6VIN
60
55
50
45
40
0
L = 1µH
COUT = 2.2µF
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
0.6
Efficiency 1.2VOUT
90
EFFICIENCY (%)
EFFICIENCY (%)
3.6VIN
80
60
0
0.6
3VIN
75
40
0
80
90
Efficiency 1.5VOUT
85
80
85
65
60
0
90
90
3VIN
95
90
85
Efficiency 1.8VOUT
Efficiency 2.5VOUT
Efficiency 3.3V OUT
100
EFFICIENCY (%)
GAIN (dB)
40
60
EFFICIENCY (%)
50
216
Bode Plot
PHASE (°)
Gain
70
GAIN (dB)
60
252
PHASE (°)
Bode Plot
70
4.2VIN
75
70
65
60
3.6VIN
55
50
45
0.6
3VIN
40
0
L = 1µH
COUT = 2.2µF
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
12
0.6
M9999-031907
Micrel, Inc.
MIC2202
MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor
VIN
MIC2202BMM
C1
1µF
2
1
VIN
VSW
5
EN
FB
4
SYNC_OUT
GND
10
3
SYNC_IN
GND
9
7
BIAS
GND
8
L1
1µH
VOUT
600mA
C3
2.2µF
R1
10k
6
R2
see BOM
for values
C2
0.01µF
GND
GND
Figure 7. MIC2202BMM Schematic
Bill of Materials
Item
C1
C2
C3
L1
Part Number
Manufacturer
06036D105MAT2
AVX
GRM185R60J105KE21D
Murata
0201ZD103MAT2
GRM033R10J103KA01D
06036D225MAT2
GRM033R10J103KA01D
LQH32CN1R0M53K
R1
CDRH2D14-2R2
CRCW04021002F
Qty.
(2)
1µF Ceramic Capacitor X5R, 6.3V, Size 0603
1
AVX(1)
10nF Ceramic Capacitor 6.3V, Size 0201
(2)
AVX(1)
2.2µF Ceramic Capacitor X5R, 6.3V, Size 0603
(2)
Murata
Murata(2)
Sumida
Vishay-Dale(4)
10kΩ 1%, Size 0402
CRCW04022491F
2.49kΩ 1%, Size 0402 For 2.5VOUT
Vishay-Dale
1
3.83kΩ 1%, Size 0402 For 1.8VOUT
(4)
1
4.99kΩ 1%, Size 0402 For 1.5VOUT
7.15kΩ 1%, Size 0402 For 1.2VOUT
10kΩ 1%, Size 0402 For 1VOUT
CRCW04021002F
N/A
MIC2202BMM
1
1.5µH Inductor 63mΩ (3.2mmx3.2mmx1.55mm)
CRCW04027151F
U1
1
1µH Inductor 60mΩ (3.2mmx2.5mmx1.55mm)
(3)
1.78kΩ 1%, Size 0402 For 3.3VOUT
CRCW04024991F
1
10nF Ceramic Capacitor 6.3V, Size 0202
Murata
CRCW04021781F
CRCW04023831F
R2
Description
(1)
Open
(5)
Micrel, Inc.
For 0.5VOUT
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
March 2007
13
M9999-031907
Micrel, Inc.
MIC2202
MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor
PHASE (°)
70
252
60
216
Gain
50
180
Phase
40
144
30
108
20
72
10
36
0
0
-10 3.6VIN
-36
1.8VOUT
-20
-72
L = 4.7µH
-30
-108
1x102 1x103 1x104 1x105 1x106 1x107
FREQUENCY (Hz)
Efficiency 3.3V OUT
100
4.2VIN
95
90
EFFICIENCY (%)
EFFICIENCY (%)
95
5VIN
85
L = 4.7µH
COUT = 1µF
80
75
70
0
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
85
80
4.2VIN
3.6VIN
75
L = 4.7µH
COUT = 1µF
70
60
0
0.6
80
0.6
3VIN
75
70
65
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
4.2VIN
85
60
0
L = 4.7µH
COUT = 1µF
3.6VIN
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
0.6
Efficiency 1.2VOUT
4.2VIN
90
EFFICIENCY (%)
EFFICIENCY (%)
90
95
90
85
80
3VIN
75
60
0
3VIN
90
Efficiency 1.5VOUT
65
95
65
95
70
Efficiency 1.8VOUT
Efficiency 2.5V OUT
EFFICIENCY (%)
100
Bode Plote
GAIN (dB)
PHASE (°)
GAIN (dB)
Bode Plot
70
252
60
216
Gain
50
180
Phase
40
144
30
108
20
72
10
36
0
0
-10 5VIN
-36
-20 1.8VOUT
-72
L = 4.7µH
-30
-108
1x102 1x103 1x104 1x105 1x106 1x107
FREQUENCY (Hz)
L = 4.7µH
COUT = 1µF
3.6VIN
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
March 2007
0.6
4.2VIN
85
80
75
3VIN
70
L = 4.7µH
65 COUT = 1µF
60
0
3.6VIN
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
14
0.6
M9999-031907
Micrel, Inc.
MIC2202
MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor
L1
4.7µH
VIN
MIC2202BMM
C1
1µF
2
VOUT
600mA
C3
1µF
1
VIN
VSW
5
EN
FB
4
SYNC_OUT
GND
10
3
SYNC_IN
GND
9
7
BIAS
GND
8
R1
10k
6
R2
see BOM
for values
C2
0.01µF
GND
GND
Figure 8. MIC2202BMM Schematic
Bill of Materials
Item
C1, C3
C2
L1
Part Number
Manufacturer
06036D105MAT2
AVX
GRM185R60J105KE21D
Murata
0201ZD103MAT2
GRM033R10J103KA01D
LQH32CN4R7M53K
R1
CDRH2D14-4R7
CRCW04021002F
Qty.
(2)
1µF Ceramic Capacitor X5R, 6.3V, Size 0603
2
AVX(1)
10nF Ceramic Capacitor 6.3V, Size 0201
(2)
Murata(2)
4.7µH Inductor 150mΩ (3.2mmx2.5mmx1.55mm)
(3)
4.7µH Inductor 169mΩ (3.2mmx3.2mmx1.55mm)
Sumida
Vishay-Dale(4)
1.78kΩ 1%, Size 0402 For 3.3VOUT
2.49kΩ 1%, Size 0402 For 2.5VOUT
Vishay-Dale
CRCW04027151F
7.15kΩ 1%, Size 0402 For 1.2VOUT
CRCW04021002F
10kΩ 1%, Size 0402 For 1VOUT
MIC2202BMM
Open
Micrel, Inc.
1
4.99kΩ 1%, Size 0402 For 1.5VOUT
N/A
U1
1
3.83kΩ 1%, Size 0402 For 1.8VOUT
(4)
(5)
1
10kΩ 1%, Size 0402
CRCW04022491F
CRCW04024991F
1
10nF Ceramic Capacitor 6.3V, Size 0202
Murata
CRCW04021781F
CRCW04023831F
R2
Description
(1)
For 0.5VOUT
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
March 2007
15
M9999-031907
Micrel, Inc.
MIC2202
MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor
Phase
180
50
144
40
30
108
20
72
10
36
0
0
-10
-20
5VIN
1.8VOUT
L = 1µH
-36
-72
252
216
Gain
180
Phase
144
30
108
20
72
10
36
0
0
3.6VIN
1.8VOUT
L = 1µH
-10
-20
-36
-72
-30
-108
1x102 1x103 1x104 1x105 1x106 1x107
FREQUENCY (Hz)
FREQUENCY (Hz)
EFFICIENCY (%)
-30
-108
1x102 1x103 1x104 1x105 1x106 1x107
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency 3.3V OUT
100
4.2VIN
95
5VIN
L = 1µH
COUT = 4.7µF
EFFICIENCY (%)
GAIN (dB)
40
60
3VIN
85
80
90
85
80
75
3.6VIN
4.2VIN
70
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
60
0
0.6
Efficiency 1.5VOUT
L = 1µH
COUT = 4.7µF
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
0.6
75
70
65
60
55
50
45
40
0
3.6VIN
4.2VIN
3VIN
L = 1µH
COUT = 4.7µF
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
0.6
Efficiency 1.2V OUT
90
4.2VIN
85
75
70
3VIN
65
3.6VIN
60
55
50
L = 1µH
COUT = 4.7µF
0.1 0.2 0.3 0.4 0.5
OUTPUT CURRENT (A)
March 2007
85
EFFICIENCY (%)
80
EFFICIENCY (%)
90
65
90
45
40
0
Efficiency 1.8VOUT
Efficiency 2.5V OUT
EFFICIENCY (%)
50
216
Bode Plot
PHASE (°)
Gain
70
GAIN (dB)
60
252
PHASE (°)
Bode Plot
70
0.6
4.2VIN
80
75
70
65
3VIN
3.6VIN
60
55
50
45
40
0
L = 1µH
COUT = 4.7µF
0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT (A)
16
M9999-031907
Micrel, Inc.
MIC2202
MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor
VIN
MIC2202BMM
C1
1µF
2
1
VIN
VSW
5
EN
FB
4
SYNC_OUT
GND
10
3
SYNC_IN
GND
9
7
BIAS
GND
8
L1
1µH
VOUT
600mA
C3
4.7µF
R1
10k
6
R2
see BOM
for values
C2
0.01µF
GND
GND
Figure 9. MIC2202BMM Schematic
Bill of Materials
Item
C1
C2
C3
L1
Part Number
Manufacturer
06036D105MAT2
AVX
GRM185R60J105KE21D
Murata
0201ZD103MAT2
GRM033R10J103KA01D
06036D475MAT2
GRM033R10J103KA01D
LQH32CN1R0M53K
R1
CDRH2D14-1R5
CRCW04021002F
Qty.
(2)
1µF Ceramic Capacitor X5R, 6.3V, Size 0603
1
AVX(1)
10nF Ceramic Capacitor 6.3V, Size 0201
(2)
AVX(1)
4.7µF Ceramic Capacitor 4V, Size 0201
(2)
Murata(2)
1µH Inductor 60mΩ (3.2mmx2.5mmx1.55mm)
(3)
Vishay-Dale(4)
10kΩ 1%, Size 0402
CRCW04022491F
2.49kΩ 1%, Size 0402 For 2.5VOUT
Vishay-Dale
1
4.99kΩ 1%, Size 0402 For 1.5VOUT
7.15kΩ 1%, Size 0402 For 1.2VOUT
10kΩ 1%, Size 0402 For 1VOUT
CRCW04021002F
N/A
MIC2202BMM
1
3.83kΩ 1%, Size 0402 For 1.8VOUT
(4)
CRCW04027151F
U1
1
1.5µH Inductor 63mΩ (3.2mmx3.2mmx1.55mm)
1.78kΩ 1%, Size 0402 For 3.3VOUT
CRCW04024991F
1
4.7µF Ceramic Capacitor 6.3V, Size 0202
Murata
Sumida
1
10nF Ceramic Capacitor 6.3V, Size 0202
Murata
CRCW04021781F
CRCW04023831F
R2
Description
(1)
Open
(5)
Micrel, Inc.
For 0.5VOUT
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
March 2007
17
M9999-031907
Micrel, Inc.
MIC2202
Package Information
10-Pin MSOP (MM)
10-Pin MFL® (ML)
March 2007
18
M9999-031907
Micrel, Inc.
MIC2202
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.
March 2007
19
M9999-031907
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