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MP2303芯片数据手册.pdf

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    The Future of Analog IC Technology MP2303 3A, 28V, 340KHz Synchronous Rectified Step-Down Converter transient DESCRIPTION The MP2303 is a monolithic synchronous buck regulator. The device integrates power MOSFETS that provide 3A continuous load current over a wide operating input voltage of 4.75V to 28V. Current mode control provides fast response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops to 1μA. This device, available in 8-pin SOIC and 3x3 10-pin QFN packages, provides a very compact system solution with minimal reliance on external components. EVALUATION BOARD REFERENCE Dimensions Board Number EV2303DN-00A 2.0”X x 1.5”Y x 0.5”Z FEATURES • 3A Output Current • Wide 4.75V to 28V Operating Input Range • Integrated Power MOSFET Switches • Output Adjustable from 0.8V to 25V • Up to 95% Efficiency • Programmable Soft-Start • Stable with Low ESR Ceramic Output Capacitors • Fixed 340KHz Frequency • Cycle-by-Cycle Over Current Protection • • Thermally Enhanced 8-Pin SOIC and Input Under Voltage Lockout 3x3 QFN10 Packages APPLICATIONS • Distributed Power Systems • Pre-Regulator for Linear Regulators • Notebook Computers “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION R4 100kΩ C5 10nF VIN C1 10μF/35V x 2 MP2303 Rev. 0.94 1/14/2010 C4 0.1μF R2 10kΩ 1% R5 47kΩ C6 NS C3 3.3nF R3 6.98kΩ VOUT 5V/3A ) % ( I Y C N E C F F E I 100 90 80 70 60 50 Efficiency vs Load Current VIN = 12V VIN = 24V VOUT = 5V 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) MP2303-EC01 BS SS EN IN MP2303 SW COMP GND FB R1 52.3kΩ 1% L1 15μH C2 22μF/10V x 2 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2010 MPS. All Rights Reserved. 1
    MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER ORDERING INFORMATION Part Number MP2303DN* MP2303DQ** Package SOIC8E (Exposed Pad) QFN10 (3mm x 3mm) * For Tape & Reel, add suffix –Z (e.g. MP2303DN–Z); K2 Top Marking MP2303DN Temperature –40°C to +85°C MP2303DQ For RoHS compliant packaging, add suffix –LF (e.g. MP2303DN–LF–Z) ** For Tape & Reel, add suffix –Z (e.g. MP2303DQ–Z); For RoHS compliant packaging, add suffix –LF (e.g. MP2303DQ–LF–Z) PACKAGE REFERENCE TOP VIEW TOP VIEW BS IN SW GND 1 2 3 4 8 7 6 5 SS EN COMP FB MP2303_PD01_SOIC8N SOIC8E (Exposed Pad) ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage VIN .......................–0.3V to +30V Switch Voltage VSW ...................................... 31V Boost Voltage VBS ..........VSW – 0.3V to VSW + 6V All Other Pins.................................–0.3V to +6V Junction Temperature...............................150°C Continuous Power Dissipation (TA = +25°C)(2) SOIC8E...................................................... 2.5W QFN10 (3mmx3mm) .................................. 2.5W Lead Temperature ....................................260°C Storage Temperature ............. –65°C to +150°C IN SW GND GND GND 1 2 3 4 5 10 9 8 7 6 SS BS EN COMP FB EXPOSED PAD ON BACKSIDE MP2303_PD02_QFN10 QFN10 (3mm x 3mm) Recommended Operating Conditions (3) Input Voltage VIN............................ 4.75V to 28V Output Voltage VOUT ........................ 0.8V to 25V Ambient Operating Temperature ... –40°C to +85°C Thermal Resistance (4) SOIC8E .................................. 50...... 10... °C/W 3x3 QFN10 ............................. 50...... 12... °C/W θJC θJA Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ(MAX), the junction-to- ambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at by any PD(MAX)=(TJ(MAX)-TA)/ θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. temperature calculated ambient is 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7 4-layer board. MP2303 Rev. 0.94 1/14/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2010 MPS. All Rights Reserved. 2
    MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER ELECTRICAL CHARACTERISTICS (5) VIN = 12V, TA = +25°C, unless otherwise noted. Parameter Shutdown Supply Current Supply Current Symbol Condition Feedback Voltage OVP Threshold Voltage Error Amplifier Voltage Gain Error Amplifier Transconductance High-Side Switch-On Resistance Low-Side Switch-On Resistance High-Side Switch Leakage Current Upper-Switch Current Limit Lower-Switch Current Limit COMP to Current Sense Transconductance Oscillation Frequency Short Circuit Oscillation Frequency Maximum Duty Cycle Minimum On-Time EN Shutdown Threshold Voltage EN Shutdown Threshold Voltage Hysteresis EN Lockout Threshold Voltage Min Typ (5) 0.3 1.3 Max 3.0 1.5 Units μA mA 0.780 0.800 0.820 V 0.772 0.90 550 4.3 300 270 1.1 2.2 2.1 0.95 400 820 125 125 0 6.3 1.25 9 340 110 90 220 1.5 220 2.5 0.828 1.00 1100 10 8.3(5) 380 400 2.0 2.7 2.8 VEN = 0V VEN = 2.7V, VFB = 1.0V 4.75V ≤ VIN ≤ 28V, TA = +25°C –40°C ≤ TA ≤ +85°C ΔIC = ±10μA VEN = 0V, VSW = 0V From Drain to Source VFB AEA GEA RDS(ON)1 RDS(ON)2 GCS Fosc1 TA = +25°C –40°C ≤ TA ≤ +85°C Fosc2 VFB = 0V DMAX VFB = 0.7V VEN Rising –40°C ≤ TA ≤ +85°C VIN rising, TA = +25°C –40°C ≤ TA ≤ +85°C V V V/V μA/V mΩ mΩ μA A A A/V KHz KHz KHz % ns V mV V V mV V V mV μA °C 3 UVLO EN Lockout Hysteresis Input Under Voltage Lockout Threshold Input Under Voltage Lockout Threshold Hysterisis Soft-Start Current Thermal Shutdown Note: 5) 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization. 6) Guaranteed by design VSS = 0V 210 4.05 6 160 3.8 3.5 210 4.30 4.70 MP2303 Rev. 0.94 1/14/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2010 MPS. All Rights Reserved.
    MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER PIN FUNCTIONS SOIC8N Pin # 3x3 QFN10 Pin # Name Description 1 2 3 4 5 6 7 8 9 1 2 3, 4, 5 6 7 8 10 MP2303 Rev. 0.94 1/14/2010 BS IN SW High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N- Channel MOSFET switch. Connect a 0.01μF or greater capacitor from SW to BS to power the high side switch. Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.75V to 28V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor. Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch. FB COMP GND Ground. SOIC8: Connect the exposed pad to pin 4. 3x3 QFN10: Connect to pins 3, 4 and 5 and ensure that said pins are tied together. Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive voltage divider from the output voltage. The feedback reference voltage is 0.8V. See Setting the Output Voltage. Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND to compensate the regulation control loop. In some cases, an additional capacitor from COMP to GND is required. See Compensation Components. Enable Input. EN is a digital input that turns the regulator on or off. Drive EN higher than 2.7V to turn on the regulator, drive it lower than 1.1V to turn it off. Pull up by a resistive voltage divider to the IN pin for automatic startup, a 47kΩ resistor from EN to Ground and a 100kΩ resistor from EN to VIN. Soft-start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-start period. See Soft-Start Capacitor. EN SS MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2010 MPS. All Rights Reserved. 4
    MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, VO = 3.3V, L = 10µH, C1 = 10µF, C2 = 22µF x 2, TA = +25°C, unless otherwise noted. Efficiency vs Load Current 95 90 85 80 75 70 65 60 55 50 0 0.5 VIN = 12V VIN = 24V VOUT = 2.5V 1.0 1.5 2.0 2.5 LOAD CURRENT (A) 3.0 3.5 ) % ( I Y C N E C F F E I Feeback Voltage vs. Temperature ) V ( E G A T L O V K C A B D E E F 0.810 0.805 0.800 0.795 0.790 0.7850 0.780 -40 VIN = 12V VIN = 28V VIN = 4.75V 0 -20 TEMPERATURE (oC) 20 40 60 80 MP2303-EC02 MP2303-TPC01 UVLO Rising vs. Temperature Enable Lockout Threshold vs. Temperature Oscillator Frequency ) V ( D L O H S E R H T O L V U 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 -40 2.70 2.65 2.60 2.55 2.50 2.45 2.40 2.35 ) V ( E G A T L O V E L B A N E -20 0 20 60 TEMPERATURE (oC) 40 80 2.30 -40 0 -20 TEMPERATURE (oC) 20 40 345 340 335 330 ) z H K ( Y C N E U Q E R F 60 80 325 -40 -20 0 20 60 TEMPERATURE (oC) 40 80 MP2303-TPC02 MP2303-TPC03 MP2303 Rev. 0.94 1/14/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2010 MPS. All Rights Reserved. MP2303-TPC04 5
    MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 12V, VO = 3.3V, L = 10µH, C1 = 10µF, C2 = 22µF x 2, TA = +25°C, unless otherwise noted. Power Off through Enable VIN = 24V, VOUT = 3.3V, IOUT = 2A VOUT 1V/div. IL 1A/div. VOUT 1V/div. VEN 5V/div. IL 1A/div. VSW 10V/div. 4ms/div. MP2303-TPC05 MP2303-TPC06 Steady State Test VIN = 12V, VOUT = 3.3V, IOUT = 1A Load Transient Test VIN = 24V, VOUT = 3.3V, IOUT = 0A-1A step with CFF = 470pF Short Circuit Protection VIN = 24V, VOUT = 3.3V, IOUT = 0A VIN 200mV/div. IL 500mA/div. VOUT AC Coupled 10mV/div. VCOMP 200mV/div. VOUT 100mV/div. IL 1A/div. VSW 20V/div. VOUT 1V/div. VCOMP 1V/div. IL 2A/div. MP2303-TPC07 MP2303-TPC08 MP2303-TPC09 MP2303 Rev. 0.94 1/14/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2010 MPS. All Rights Reserved. 6
    MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER OPERATION FB SS COMP EN + -- + -- -- + + -- + + -- 0.95V 0.3V 0.8V 2.5V 1.5V OVP OSCILLATOR 340KHz RAMP CLK ERROR AMPLIFIER EN OK LOCKOUT COMPARATOR SHUTDOWN COMPARATOR CURRENT SENSE AMPLIFIER + -- S R Q Q CURRENT COMPARATOR 1.2V + -- 5V OVP IN < 4.1V IN INTERNAL REGULATORS IN BS SW GND Figure 1—Functional Block Diagram is a synchronous rectified, The MP2303 current-mode, step-down regulator. It regulates input voltages from 4.75V to 28V down to an output voltage as low as 0.8V, and supplies up to 3A of load current. The MP2303 uses current-mode control to regulate the output voltage. The output voltage is measured at FB through a resistive voltage divider and amplified internal transconductance error amplifier. The voltage at COMP pin is compared to the switch current measured the output voltage. to control internally through the the to step-down converter uses internal N-Channel The MOSFET switches input voltage to the regulated output voltage. Since the high-side MOSFET requires a gate voltage greater than the input voltage, a boost capacitor connected between SW and BS is needed to drive the high-side gate. The boost capacitor is charged from the internal 5V rail when SW is low. When the MP2303 FB pin exceeds 20% of the nominal regulation voltage of 0.8V, the over voltage comparator is tripped; the COMP pin and the SS pin are discharged to GND, forcing the high-side switch off. MP2303 Rev. 0.94 1/14/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2010 MPS. All Rights Reserved. 7
    MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER APPLICATIONS INFORMATION COMPONENT SELECTION Setting the Output Voltage The output voltage is set using a resistive voltage divider from the output voltage to FB pin. The voltage divider divides the output voltage down to the feedback voltage by the ratio: V FB = V OUT 2R + 2R1R Thus the output voltage is: VOUT = 2R1R8.0 × + 2R Where VFB is the feedback voltage and VOUT is the output voltage. A typical value for R2 can be as high as 100kΩ, but a typical value is 10kΩ. Using that value, R1 is determined by: 1R = V(5.12 × OUT − )k)(8.0 Ω For example, for a 3.3V output voltage, R2 is 10kΩ, and R1 is 31.3kΩ. Inductor The inductor is required to supply constant current to the output load while being driven by the switched input voltage. A larger value inductor will result in less ripple current that will result in lower output ripple voltage. However, the larger value inductor will have a larger physical size, higher series resistance, and/or lower saturation current. A good rule for determining the inductance to use is to allow the peak-to-peak ripple current in the inductor to be approximately 30% of the maximum switch current limit. Also, make sure that the peak inductor current is below the maximum switch current limit. The inductance value can be calculated by: L = V OUT ΔI f × S × ⎛ ⎜⎜ ⎝ V1 OUT − V IN ⎞ ⎟⎟ ⎠ Where VIN is the input voltage, fS is the 340KHz switching frequency, and ΔIL is the peak-to- peak inductor ripple current. Choose an inductor that will not saturate under the maximum inductor peak current. The peak inductor current can be calculated by: × L S + ⎞ ⎟⎟ ⎠ = I 1 − I LP LOAD V OUT V IN V OUT f2 × × ⎛ ⎜⎜ ⎝ Where ILOAD is the load current. Optional Schottky Diode During the transition between high-side switch and low-side switch, the body diode of the low- side power MOSFET conducts the inductor current. The forward voltage of this body diode is high. An optional Schottky diode may be paralleled between the SW pin and GND pin to improve overall efficiency. Table 2 lists example Schottky diodes and their Manufacturers. Table 2—Diode Selection Guide Part Number B130 SK13 MBRS130 Voltage/Current Rating 30V, 1A 30V, 1A 30V, 1A Vendor Diodes, Inc. Diodes, Inc. International Rectifier the DC Input Capacitor The input current to the step-down converter is discontinuous, therefore a capacitor is required to supply the AC current to the step-down converter while maintaining input voltage. Use low ESR capacitors for the best performance. Ceramic capacitors are preferred, but tantalum or low-ESR electrolytic capacitors may also suffice. Choose X5R or X7R dielectrics when using ceramic capacitors. Since the input capacitor (C1) absorbs the input switching current it requires an adequate ripple current rating. The RMS current in the input capacitor can be estimated by: I 1C = I LOAD × V OUT V IN V1 ⎛ OUT × − ⎜ V ⎜ IN ⎝ ⎞ ⎟ ⎟ ⎠ The worst-case condition occurs at VIN = 2VOUT, where: I 1C = I LOAD 2 MP2303 Rev. 0.94 1/14/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2010 MPS. All Rights Reserved. 8
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