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MIC2202
Micrel
MIC2202
High Efficiency 2MHz Synchronous Buck Converter 1F 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 1F ceramic output capacitor and a small, low DC-resistance, 2.2H 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 x 3mm MLFTM-10L package options with an operating junction temperature range from -40C to +125C .
Features
Input voltage range: 2.3V to 5.5V Output down to 0.5V/600mA 2MHz PWM operation Stable with 1F 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 3mmx3mm MLFTM-10L package options * -40C to +125C 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
2.2H
VOUT 3.3V 600mA 10 9 8 7 6 1.78k 10nF 10k 1F
EFFICIENCY (%)
100 95 90 85 80 75 70 65 60 0
Efficiency 3.3VOUT
4.2VIN
VIN 2.3V to 5.5V SYNC_IN
1 2 3
5VIN
SYNC_OUT 4 EN 5
L = 2.2H COUT = 1F
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
Adjustable Output Synchronous Buck Converter
MicroLeadFrame 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
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MIC2202
Micrel
Ordering Information
Part Number MIC2202BMM MIC2202BML MIC2202YMM MIC2202YML Voltage Adjustable Adjustable Adjustable Adjustable Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package 10-pin MSOP-10 10-pin MLFTM 10-pin MSOP-10 10-pin MLFTM Lead Finish Standard Standard Pb-Free Pb-Free
Pin Configuration
SW 1 VIN 2 SYNC_IN 3 SYNC_OUT 4 EN 5 10 GND 9 GND 8 GND 7 BIAS 6 FB
SW 1 VIN 2 SYNC_IN 3 SYNC_OUT 4 EN 5 EP
10 GND 9 GND 8 GND 7 BIAS 6 FB
MSOP-10 (MM)
MLFTM-10 (ML) (Top View)
Pin Description
Pin Number 1 2 3 4 5 6 7 8, 9, 10 EP Pin Name SW VIN SYNC_IN SYNC_OUT EN FB BIAS GND GND Pin Function Switch (Output): Internal power MOSFET output switches. Supply Voltage (Input): Requires bypass capacitor to GND. SYNC_IN for the MIC2202: Sync the main switching frequency to an external clock. SYNC_OUT an open collector output. A low level EN will power down the device, reducing the quiescent current to under 1A. Input to the error amplifier, connect to the external resistor divider network to set the output voltage. Internal circuit bias supply, nominally 2.3V. Must be de-coupled to signal ground with a 0.01F capacitor. Ground. Ground, backside pad.
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Absolute Maximum Ratings(Note 1)
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) ....................... -65C to +150C ESD Rating (Note 4) ..................................................... 2kV
Operating Ratings(Note 2)
Supply Voltage (VIN) ................................... +2.3V to +5.5V Junction Temperature (TJ) ................ -40C TJ +125C Package Thermal Resistance MSOP-10L (JA) ................................................ 115C/W 3mmx3mm MLFTM-10L (JA) ............................... 60C/W
Electrical Characteristics(Note 5)
TA = 25C with VIN = 3.5V unless otherwise noted, bold values indicate -40C < TJ < +125C Parameter Supply Voltage Range Quiescent Current EN = VIN; VFB = 0.55V (not switching) EN = 0V MIC2202 [Adjustable] Feedback Voltage Output Voltage Line Regulation Output Voltage Load Regulation Bias Regulator Output Voltage Maximum Duty Cycle Current Limit Switch ON-Resistance VFB = 0.7V VFB = 0.7V VIN = 3.5V, ISW = 300mA VFB = 0.35V VIN = 3.5V, ISW = -300mA VFB = 0.55V Enable Input Current Sync Frequency Range SYNC_IN Threshold Sync Minimum Pulse Width SYNC_IN Input Current Oscillator Frequency Enable Threshold Enable Hysteresis Over-temperature Shutdown Over-temperature Shutdown Hysteresis
Note 1. Note 2. Note 3. Note 4. Note 5. Exceeding the ABSOLUTE MAXIMUM RATINGS may damage device. The device is not guaranteed to function outside its operating rating. Absolute maximum power dissipation is limited by maximum junction temperature where PD(MAX) = (TJ(MAX)-TA) / JA. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Specification for packaged product only.
Condition
Min 2.3
Typ
Max 5.5
Units V A A V % % V %
350 0.01 0.4875 0.500 0.05 0.1 2.2 100 1 1.8 0.650 0.550 0.01 1.6 0.7 1 10 2.32
450 1 0.5125 0.5 0.5 2.6
VOUT < 2V; VIN = 2.3V to 5.5V, ILOAD= 100mA 0mA < ILOAD < 500mA
2.5 0.9 0.75 1 2.5 1.7
A A MHz V ns A MHz V mV C C
1 1.8 0.5 2 0.9 20 160 20 2.2 1.3
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Typical Characteristics
Output Voltage vs. Output Current
0.5050 OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
0.515 0.510
Output Voltage vs. Temperature
2.5 2.0
VBIAS vs. Supply Voltage
0.5025
0.505 0.500 0.495 0.490 0.485 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
0.5000
VBIAS (V)
1.5 1.0 0.5 VFB = 0V 0 0 2 4 SUPPLY VOLTAGE (V) 6
0.4975
0.4950 0
0.1 0.2 0.3 0.4 OUTPUT CURRENT (A)
0.5
2.320 2.318 2.316 2.314
Bias Supply vs. Temperature
350 300 250
IQ (A)
Quiescent Current vs. Supply Voltage
Quiescent Current vs. Temperature
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)
BIAS SUPPLY (V)
2.31 2.308 2.306 2.304 2.302 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
150 100 50 0 0 VFB = 0V 1 2 3 4 5 6 SUPPLY VOLTAGE (V)
IQ (A)
2.312
200
Frequency vs. Temperature
2.40
1.0
Enable Threshold vs. Supply Voltage
Enable On
ENABLE THRESHOLD (V)
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
Enable Threshold vs. Temperature
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 (MHz)
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2
Enable Off
0.1 0 2.3 2.8 3.3 3.8 4.3 4.8 5.3 SUPPLY VOLTAGE (V)
3.6VIN
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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Block Diagram
VIN
CIN SYNC_OUT VIN
SYNC_IN
Oscillator Ramp Generator
BIAS
Internal Supply
Error Amplifier
PWM Comparator SW Driver VOUT
COUT 0.5V
EN MIC2202 FB PGND
MIC2202 Block Diagram
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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.
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 1F 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 <1A). 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.
MIC2202 "Master" VIN 10k SYNC_IN SYNC_OUT FB MIC2202 "Slave" VIN SW BIAS SYNC_IN SYNC_OUT FB SW BIAS
Figure 1. Master-Slave Operation
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Efficiency Considerations Efficiency is defined as the amount of useful output power, divided by the amount of power consumed.
V xI Efficiency % = OUT OUT x 100 VIN x IIN
Applications Information
Input Capacitor A minimum 1F 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 1F 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 15F. Large values of capacitance can cause current limit to engage during start-up. If larger than 15F 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 1H to 4.7H 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 40C 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.
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.
Efficiency vs. Output Current
100 95 90
EFFICIENCY (%)
85 80 75 70 65 60 55 50 0
4.2VIN 5VIN
3.3VOUT 0.1 0.2 0.3 0.4 0.5 0.6 OUTPUT CURRENT (A)
Figure 2. Efficiency Curve 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 = IOUT 2 x DCR
From that, the loss in efficiency due to inductor resistance can be calculated as follows:
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VOUT x IOUT Efficiency Loss = 1- x 100 VOUT x IOUT + LPD
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 vs. Inductance
100 4.7H 80
EFFICIENCY (%)
Micrel
follows:
R2 =
R1 VOUT - 1 V REF
Where VREF is 0.5V and VOUT 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 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.
1H 60 2.2H 40 20 0 0 1.8VOUT 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 2.2H inductor and a 1F ceramic (X5R) output capacitor. These values can be interchanged (i.e. 1H inductor and a 2.2F 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
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MIC2202
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.
Micrel
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" VIN 10k SYNC_IN SYNC_OUT FB MIC2202 "Slave" VIN SW BIAS SYNC_IN SYNC_OUT FB SW BIAS
Figure 4. Master-Slave Operation
Slave Switch Mode
Master Sync Out
Master Switch Mode
TIME (400ns/div.)
Figure 5. Master-Slave Synchronization Waveforms
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MIC2202BMM with 2.2H Inductor and 1F Output Capacitor
70 60 50 40
GAIN (dB)
Bode Plot
Gain Phase
252 216 180
PHASE () GAIN (dB)
30 20 10 0 -10 -20 5VIN 1.8VOUT L = 1H C = 2.2F
72 36 0 -36
-72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz)
-36 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz)
IOUT 200mA/div
20 10 0 -10 -20
PHASE ()
VOUT 200mV/div
144 108
70 60 50 40 30
Bode Plot
Gain Phase
252 216 180 144 108 72 36 0
Load Transient
3.6VIN 1.8VOUT L = 1H
L = 2.2H C = 1F VIN = 3.6V VOUT = 1.8V
TIME (40s/div.)
100 95
EFFICIENCY (%)
Efficiency 3.3VOUT
4.2VIN
EFFICIENCY (%)
Efficiency 2.5VOUT
100 95 90 85 80 75 70 65 L = 2.2H COUT = 1F 3.6VIN 3VIN
EFFICIENCY (%)
Efficiency 1.8VOUT
100 95 3VIN
90 85 80 75 70 65 60 0
4.2VIN
5VIN
90 85 80 75 70 65 L = 2.2H COUT = 1F 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 4.2VIN 3.6VIN
L = 2.2H COUT = 1F
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
60 0
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
60 0
Efficiency 1.5VOUT
100 95
EFFICIENCY (%)
Efficiency 1.2VOUT
100 95
EFFICIENCY (%)
Vsw-Vripple
L = 2.2H C = 1F VIN = 3.6V VOUT = 1.8V IOUT = 600mA
VSW 2V/div
3VIN 4.2VIN
3VIN 4.2VIN
90 85 80 75 L = 2.2H 70 C OUT = 1F 65 60 0 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 3.6VIN
90 85 80 75 3.6VIN 0.6
VOUT 20mV/div
L = 2.2H 70 C OUT = 1F 65 60 0
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
TIME (400ns/div.)
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MIC2202BMM with 2.2H Inductor and 1F Output Capacitor
VIN MIC2202BMM C1 1F
2 5 4 3 7
L1 2.2H VSW FB
1 6 10 9 8
VOUT 600mA R1 10k R2 see BOM for values
VIN EN
C3 1F
SYNC_OUT GND SYNC_IN GND BIAS GND
GND
C2 0.01F
GND
Figure 6. MIC2202BMM Schematic
Bill of Materials
Item C1, C3 C2 L1 R1 R2 Part Number 06036D105MAT2 GRM185R60J105KE21D 0201ZD103MAT2 GRM033R10J103KA01D LQH32CN2R2M53K CDRH2D14-2R2 CRCW04021002F CRCW04021781F CRCW04022491F CRCW04023831F CRCW04024991F CRCW04027151F CRCW04021002F N/A MIC2202BMM Manufacturer AVX Murata AVX Murata Murata Sumida Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Micrel, Inc. Description 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 10nF Cermaic Capacitor 6.3V, Size 0201 10nF Cermaic Capacitor 6.3V, Size 0202 2.2uH Inductor 97m (3.2mmx2.5mmx1.55mm) 2.2uH Inductor 94m (3.2mmx3.2mmx1.55mm) 10k 1%, Size 0402 1.78k 1%, Size 0402 2.49k 1%, Size 0402 3.83k 1%, Size 0402 4.99k 1%, Size 0402 7.15k 1%, Size 0402 10k 1%, Size 0402 Open For 3.3VOUT For 2.5VOUT For 1.8VOUT For 1.5VOUT For 1.2VOUT For 1VOUT For 0.5VOUT 1 Qty. 2 1 1
U1
1. 2. 3. 4.
2MHz High Efficiency Synchronous Buck Regulator
1
AVX: www.avx.com Murata: www.murata.com Sumida: www.sumida.com Vishay-Dale: www.vishay.com
5. Micrel, Inc: www.micrel.com
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MIC2202
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MIC2202BMM with 1H Inductor and 2.2F Output Capacitor
70 60 50 40
GAIN (dB)
Bode Plot
Gain Phase
252 216 180
PHASE () GAIN (dB)
70 60 50 40 30 20 10 0 -10 -20
Bode Plot
Gain Phase
252 216 180
PHASE ()
VOUT 200mV/div
Load Transient
30 20 10 0 -10 -20 5VIN 1.8VOUT L = 1H
144 108 72 36 0 -36
144 108 72 36
-72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz)
-72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz)
IOUT 200mA/div
3.6VIN 1.8VOUT L = 1H
0 -36
L = 2.2H C = 1F VIN = 3.6V VOUT = 1.8V
TIME (40s/div.)
100 95
EFFICIENCY (%)
Efficiency 3.3VOUT
4.2VIN
EFFICIENCY (%)
Efficiency 2.5VOUT
100 95 90 85 80 75 70 65 4.2VIN 3.6VIN L = 1H COUT = 2.2F 3VIN
EFFICIENCY (%)
Efficiency 1.8VOUT
90 85 80 75 70 65 60 55 50 45 40 0 L = 1H COUT = 2.2F 3VIN 4.2VIN 3.6VIN
90 85 80 75 70 65 60 0 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 L = 1H COUT = 2.2F 5VIN
60 0
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
Efficiency 1.5VOUT
90 3VIN 85
EFFICIENCY (%) EFFICIENCY (%)
Efficiency 1.2VOUT
90 85 80 75 70 65 60 55 50 45 0.6 40 0
VSW 2V/div
Vsw-Vripple
L = 2.2H C = 1F VIN = 3.6V VOUT = 1.8V IOUT = 600mA
3VIN
4.2VIN
80 75 70 65 60 55 50 45 40 0
4.2VIN 3.6VIN
3.6VIN
L = 1H COUT = 2.2F 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
VOUT 20mV/div
L = 1H COUT = 2.2F
TIME (400ns/div.)
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MIC2202BMM with 1H Inductor and 2.2F Output Capacitor
VIN MIC2202BMM C1 1F
2 5 4 3 7
L1 1H VSW FB
1 6 10 9 8
VOUT 600mA R1 10k R2 see BOM for values
VIN EN
C3 2.2F
SYNC_OUT GND SYNC_IN GND BIAS GND
GND
C2 0.01F
GND
Figure 7. MIC2202BMM Schematic
Bill of Materials
Item C1 C2 C3 L1 R1 R2 Part Number 06036D105MAT2 GRM185R60J105KE21D 0201ZD103MAT2 GRM033R10J103KA01D 06036D225MAT2 GRM033R10J103KA01D LQH32CN1R0M53K CDRH2D14-2R2 CRCW04021002F CRCW04021781F CRCW04022491F CRCW04023831F CRCW04024991F CRCW04027151F CRCW04021002F N/A MIC2202BMM Manufacturer AVX Murata AVX Murata AVX Murata Murata Sumida Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Micrel, Inc. Description 1F Ceramic Capacitor X5R, 6.3V, Size 0603 1F Ceramic Capacitor X5R, 6.3V, Size 0603 10nF Cermaic Capacitor 6.3V, Size 0201 10nF Cermaic Capacitor 6.3V, Size 0202 2.2F Ceramic Capacitor X5R, 6.3V, Size 0603 2.2F Ceramic Capacitor X5R, 6.3V, Size 0603 1H Inductor 60m (3.2mmx2.5mmx1.55mm) 1.5H Inductor 63m (3.2mmx3.2mmx1.55mm) 10k 1%, Size 0402 1.78k 1%, Size 0402 2.49k 1%, Size 0402 3.83k 1%, Size 0402 4.99k 1%, Size 0402 7.15k 1%, Size 0402 10k 1%, Size 0402 Open For 3.3VOUT For 2.5VOUT For 1.8VOUT For 1.5VOUT For 1.2VOUT For 1VOUT For 0.5VOUT Qty. 1 1 1 1 1 1
U1
1. 2. 3. 4.
2MHz High Efficiency Synchronous Buck Regulator
1
AVX: www.avx.com Murata: www.murata.com Sumida: www.sumida.com Vishay-Dale: www.vishay.com
5. Micrel, Inc: www.micrel.com
May 2004
13
M9999-052104
MIC2202
Micrel
MIC2202BMM with 4.7H Inductor and 1F Output Capacitor
70 60 50 40
GAIN (dB)
Bode Plot
Gain Phase
252 216 180
PHASE () GAIN (dB)
30 20 10 0 -10 -20 5VIN 1.8VOUT L = 4.7H
72 36 0 -36
-72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz)
-36 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz)
IOUT 200mA/div
20 10 0 -10 -20
PHASE ()
VOUT 200mV/div
144 108
70 60 50 40 30
Bode Plot
Gain Phase
252 216 180 144 108 72 36 0
Load Transient
3.6VIN 1.8VOUT L = 4.7H
L = 4.7H C = 1F VIN = 3.6V VOUT = 1.8V
TIME (40s/div.)
100 95
EFFICIENCY (%)
Efficiency 3.3VOUT
4.2VIN
EFFICIENCY (%)
100 95 90 85 80 75 70 65
Efficiency 2.5VOUT
3VIN
Efficiency 1.8VOUT
95 90
EFFICIENCY (%)
4.2VIN 3VIN
90 85 80 75 70 0
5VIN
85 80 75 70 65 L = 4.7H COUT = 1F 3.6VIN
4.2VIN
3.6VIN L = 4.7H COUT = 1F
L = 4.7H COUT = 1F
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
60 0
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
60 0
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
Efficiency 1.5VOUT
95 90 4.2VIN
EFFICIENCY (%)
Efficiency 1.2VOUT
95 90 85 80 75 70 3VIN 3.6VIN 4.2VIN
VSW 2V/div
Vsw-Vripple
EFFICIENCY (%)
85 80 75 70 65 60 0 3VIN L = 4.7H COUT = 1F 3.6VIN
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
60 0
VOUT 20mV/div
L = 4.7H 65 COUT = 1F
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
L = 4.7H VIN = 3.6V VOUT = 1.8V C = 1F IOUT = 600mA TIME (400ns/div.)
M9999-052104
14
May 2004
MIC2202
Micrel
MIC2202BMM with 4.7H Inductor and 1F Output Capacitor
VIN MIC2202BMM C1 1F
2 5 4 3 7
L1 4.7H VSW FB
1 6 10 9 8
VOUT 600mA R1 10k R2 see BOM for values
VIN EN
C3 1F
SYNC_OUT GND SYNC_IN GND BIAS GND
GND
C2 0.01F
GND
Figure 8. MIC2202BMM Schematic
Bill of Materials
Item C1, C3 C2 L1 R1 R2 Part Number 06036D105MAT2 GRM185R60J105KE21D 0201ZD103MAT2 GRM033R10J103KA01D LQH32CN4R7M53K CDRH2D14-4R7 CRCW04021002F CRCW04021781F CRCW04022491F CRCW04023831F CRCW04024991F CRCW04027151F CRCW04021002F N/A MIC2202BMM Manufacturer AVX Murata AVX Murata Murata Sumida Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Micrel, Inc. Description 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 10nF Cermaic Capacitor 6.3V, Size 0201 10nF Cermaic Capacitor 6.3V, Size 0202 4.7uH Inductor 150m (3.2mmx2.5mmx1.55mm) 4.7uH Inductor 169m (3.2mmx3.2mmx1.55mm) 10k 1%, Size 0402 1.78k 1%, Size 0402 2.49k 1%, Size 0402 3.83k 1%, Size 0402 4.99k 1%, Size 0402 7.15k 1%, Size 0402 10k 1%, Size 0402 Open For 3.3VOUT For 2.5VOUT For 1.8VOUT For 1.5VOUT For 1.2VOUT For 1VOUT For 0.5VOUT Qty. 2 1 1 1 1
U1
1. 2. 3. 4.
2MHz High Efficiency Synchronous Buck Regulator
1
AVX: www.avx.com Murata: www.murata.com Sumida: www.sumida.com Vishay-Dale: www.vishay.com
5. Micrel, Inc: www.micrel.com
May 2004
15
M9999-052104
MIC2202
Micrel
MIC2202BMM with 1H Inductor and 4.7F Output Capacitor
70 60 50 40
GAIN (dB)
Bode Plot
Gain Phase
252 216 180
PHASE () GAIN (dB)
70 60 50 40 30 20 10 0 -10 3.6VIN 1.8VOUT L = 1H
Bode Plot
Gain Phase
252 216 180 144 108 72 36 0
PHASE ()
Load Transient
30 20 10 0 -10 -20 5VIN 1.8VOUT L = 1H
72 36 0 -36
VOUT 200mV/div
144 108
-72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz)
-36 -20 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz)
IOUT 200mA/div
L = 1H C = 4.7F VIN = 3.6V VOUT = 1.8V
TIME (40s/div.)
100 95
EFFICIENCY (%)
Efficiency 3.3VOUT
4.2VIN
EFFICIENCY (%)
100 95 90 85 80 75 70 65
Efficiency 2.5VOUT
3VIN
Efficiency 1.8VOUT
90 85
EFFICIENCY (%)
90 85 80 75 70 65 60 55 50 0
5VIN
80 75 70 65 60 55 50 45 40 0
3.6VIN 4.2VIN 3VIN
3.6VIN 4.2VIN
L = 1H COUT = 4.7F
L = 1H COUT = 4.7F
L = 1H COUT = 4.7F
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
60 0
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
Efficiency 1.5VOUT
90 85 4.2VIN
EFFICIENCY (%)
Efficiency 1.2VOUT
90 85 80 75
VSW 2V/div
Vsw-Vripple
4.2VIN
EFFICIENCY (%)
80 75 70 65 60 55 50 45 40 0 3VIN 3.6VIN
70 65 60 55 50 45
3VIN 3.6VIN L = 1H COUT = 4.7F
L = 1H COUT = 4.7F 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6
40 0
VOUT 20mV/div
0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A)
0.6
VIN = 3.6V L = 1H C = 4.7F VOUT = 1.8V IOUT = 600mA TIME (400ns/div.)
M9999-052104
16
May 2004
MIC2202
Micrel
MIC2202BMM with 1H Inductor and 4.7F Output Capacitor
VIN MIC2202BMM C1 1F
2 5 4 3 7
L1 1H VSW FB
1 6 10 9 8
VOUT 600mA R1 10k R2 see BOM for values
VIN EN
C3 4.7F
SYNC_OUT GND SYNC_IN GND BIAS GND
GND
C2 0.01F
GND
Figure 9. MIC2202BMM Schematic
Bill of Materials
Item C1 C2 C3 L1 R1 R2 Part Number 06036D105MAT2 GRM185R60J105KE21D 0201ZD103MAT2 GRM033R10J103KA01D 06036D475MAT2 GRM033R10J103KA01D LQH32CN1R0M53K CDRH2D14-1R5 CRCW04021002F CRCW04021781F CRCW04022491F CRCW04023831F CRCW04024991F CRCW04027151F CRCW04021002F N/A MIC2202BMM Manufacturer AVX Murata AVX Murata AVX Murata Murata Sumida Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Micrel, Inc. Description 1F Ceramic Capacitor X5R, 6.3V, Size 0603 1F Ceramic Capacitor X5R, 6.3V, Size 0603 10nF Cermaic Capacitor 6.3V, Size 0201 10nF Cermaic Capacitor 6.3V, Size 0202 4.7F Cermaic Capacitor 4V, Size 0201 4.7F Cermaic Capacitor 6.3V, Size 0202 1H Inductor 60m (3.2mmx2.5mmx1.55mm) 1.5H Inductor 63m (3.2mmx3.2mmx1.55mm) 10k 1%, Size 0402 1.78k 1%, Size 0402 2.49k 1%, Size 0402 3.83k 1%, Size 0402 4.99k 1%, Size 0402 7.15k 1%, Size 0402 10k 1%, Size 0402 Open For 3.3VOUT For 2.5VOUT For 1.8VOUT For 1.5VOUT For 1.2VOUT For 1VOUT For 0.5VOUT Qty. 1 1 1 1 1 1
U1
1. 2. 3. 4.
2MHz High Efficiency Synchronous Buck Regulator
1
AVX: www.avx.com Murata: www.murata.com Sumida: www.sumida.com Vishay-Dale: www.vishay.com
5. Micrel, Inc: www.micrel.com
May 2004
17
M9999-052104
MIC2202
Micrel
Package Information
3.15 (0.122) 2.85 (0.114)
4.90 BSC (0.193)
DIMENSIONS: MM (INCH)
3.10 (0.122) 2.90 (0.114) 1.10 (0.043) 0.94 (0.037)
0.26 (0.010) 0.10 (0.004)
0.30 (0.012) 0.15 (0.006) 0.50 BSC (0.020)
0.15 (0.006) 0.05 (0.002)
6 MAX 0 MIN
0.70 (0.028) 0.40 (0.016)
10-Pin MSOP (MM)
DIMENSIONS: mm
0.85 +0.15 -0.05 3.00 BSC. 1.50 BSC. 0.48 typ. 0.01 +0.04 -0.01 0.23 +0.07 -0.05 1 2 3 0.20 dia 3.00 BSC. 1
+0.15 2 1.15 -0.15
1.60 +0.15 -0.15 0.80 +0.15 -0.15 PIN 1 ID
1.50 BSC.
3
2.30 +0.15 -0.15
0.50 BSC. 0.40 +0.15 -0.05 TOP BOTTOM
SEATING PLANE TERMINAL TIP
0.23 +0.07 -0.05
0.01 +0.04 -0.01
0.50 BSC. TERMINAL TIP ODD TERMINAL SIDE
0.50 BSC.
EVEN TERMINAL SIDE
10-Pin MLFTM (ML)
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated. M9999-052104
18
May 2004

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