MPQ2143H MPS | Alldatasheet
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Technical content
3A, 5.5V, 2.0MHz Synchronous Step Down Switcher MPQ2143H Rev. 1.0 www.MonolithicPower.com 1 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved.
DESCRIPTION
The MPQ2143H is a monolithic, step-down, switch-mode converter with internal power MOSFETs. It can achieve up to 3A continuous output current from a 2.5V to 5.5V input voltage with exce llent load and line regulation. The output voltage can be regulated as low as 0.6V. Constant-on-time control provides fast transient response and eases loop stabilization. Fault - condition protection s include cycle -by-cycle current limiting and thermal shutdown. The MPQ2143H is available in small QFN-10 package and requires only a minimal number of readily-available standard external components. The MPQ2143H is ideal for a wide range of applications including high-performance DSPs, FPGAs, and portable instruments.
FEATURES
Wide 2.5V to 5.5V Operating Input Range Output Voltage as Low as 0.6V 100% Duty Cycle in Dropout Up to 3A Output Current 80mΩ and 40mΩ Internal Power MOSFET Switches Default 2.0MHz Switching Frequency EN and Power-Good for Power Sequencing Cycle-by-Cycle Over-Current Protection Auto Discharge at Power Off Short-Circuit Protect with Hiccup Mode Stable with Low-ESR Output Ceramic Capacitors Available in QFN-10 (2mmx3mm) Package
APPLICATIONS
Low Voltage I/O System Power Handheld/Battery-powered Systems Wireless/Networking Cards All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology ” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION GND FB VIN EN SW EN OUT L1U1 MPQ2143H PGPG VIN VOUT
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 2 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking MPQ2143HGD QFN-10(2mmx3mm) See Below * For Tape & Reel, add suffix –Z (e.g. MPQ2143HGD–Z). TOP MARKING AMT: product code of MPQ2143HGD; Y: year code; WW: week code: LLL: lot number; PACKAGE REFERENCE QFN-10 (2mmx 3mm)
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 3 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. ABSOLUTE MAXIMUM RATINGS (1) -0.3V (-5V for <10ns) to VIN+0.3V (8V for <10ns) Continuous Power Dissipation (TA = 25°C) (2) Recommended Operating Conditions (3) Operating Junction Temp. (TJ). -40°C to +150°C Thermal Resistance (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature T J (MAX), the junction -to- ambient thermal resistance θ JA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX) = (T J (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the device will go into thermal shutdown. Internal thermal shutdown c ircuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB.
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 4 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = 5V, TJ = -40°C to 125°C, Typical value is tested at T J=+25°C. The limit over temperature is guaranteed by characterization, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Feedback Voltage VFB TJ = 25°C 591 600 609 mV TJ = -40°C to 125°C 588 600 612 Feedback Current IFB TJ = 25°C, VFB = 0.63V 10 nA PFET Switch ON Resistance RDSON_P 80 mΩ NFET Switch ON Resistance RDSON_N 40 mΩ Switch Leakage VEN = 0V, VIN = 5V, VSW = 0V and 5V, TJ = 25°C 0.1 2 μA PFET Current Limit TJ = 25°C 3.9 4.5 6 A ON Time tON VIN=5V, VOUT=1.5V 150 ns VIN=3.6V, VOUT=1.5V 200 Switching Frequency fs VIN=3.3V, VOUT=1.5V, TJ =25°C 1800 2000 kHz fs VIN=3.3V, VOUT=1.5V, TJ =-40°C to 125°C 1700 3000 Minimum OFF Time tMIN-OFF 30 ns Soft-Start Time tSS-ON VIN=3.6V, VOUT=1.5V, 10% to 90% 1.3 ms Soft-Stop Time tSS-OFF VIN=3.6V, VOUT=1.5V, 90% to 10% 1 ms Power-Good Upper Trip Threshold PGH FB falling when PG turn to high voltage 110 % Power-Good Upper Trip Hysteresis PGH_Hys 5 % Power-Good Lower Trip Threshold PGL FB Rising when PG turn to high voltage 90 % Power-Good Lower Trip Hysteresis PGL_Hys 5 % Power-Good Delay PGD 110 μs Power-Good Sink Current Capability VPG-L Sink 1mA 400 mV Power-Good Logic High Voltage VPG-H VIN=5V, VFB=0.6V 4.85 V Power-Good Internal Pull-Up Resistor RPG 500 kΩ Under-Voltage Lockout Threshold Rising 2.0 2.2 2.4 V Under-Voltage Lockout Threshold Hysteresis 150 mV
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 5 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. VIN = 5V, T J = -40°C to 125°C, Typical value is tested at T J=+25°C. The limit over temperature is guaranteed by characterization, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units EN Input Logic Low Voltage 0.4 V EN Input Logic High Voltage 1.2 V EN Input Current VEN=2V 2 μA VEN=0V 0.1 μA Supply Current (Shutdown) VEN=0V 0.1 μA Thermal Shutdown (5) 170 °C Thermal Hysteresis (5) 30 °C Notes: 5) Design Guarantee, no production test.
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 6 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 5V, VOUT = 1.2V, L = 0.47μH, COUT=22μF, TA = 25°C, unless otherwise noted.
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 7 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 1.2V, L = 0.47μH, COUT=22μF, TA = 25°C, unless otherwise noted.
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 8 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 1.2V, L = 0.47μH, COUT=22μF, TA = 25°C, unless otherwise noted.
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 9 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. PIN FUNCTIONS QFN-10 Pin # Name Description
1 EN On/Off Control
2 FB Feedback pin. Connect an external resistor divider from the output to GND to set the output voltage. 3 AGND Analog ground. Reference for the internal control circuit. 4 OUT Input Sense. For output voltage feedback. 5 NC Not Connected. It can be floated or connected to PGND for thermal. 6, 7 PGND Power Ground
8 SW Switch Output
9 VIN Supply Voltage. The MPQ2143H operates from a 2.5V -to-5.5V unregulated input. C1 prevents large voltage spikes from appearing at the input. 10 PG Power-Good Indicator. The pin output is an open drain that connects to VIN by an in ternal pull-up resistor. PG is pulled up to VIN when the FB voltage is within 10% of the regulation level. If FB voltage is out of that regulation range, it is LOW.
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 10 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. FUNCTIONAL BLOCK DIAGRAM Main Switch (PCH) Synchronous Rectifier (NCH) Constant On-Time Pulse PWM Bias Voltage Reference 0.6V EN FB SW COMP VIN FBCOMP EN Driver PDRV NDRV Soft start/off PGND OUT PWM COMP COMP 0.66V 0.54VAGND PG Protect FB for fixed output IN E.A. Ramp generator COMP VOUT RST SW Valley Current VTH Figure 1: Functional Block Diagram
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 11 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. OPERATION The MPQ2143H uses constant -on-time control with input -voltage feed -forward to stabilize the switching frequency over its full input range. It can achieve up to 3A continuous output current from a 2.5V to 5.5V input voltage with excellent load and line regulation. The output voltage can be regulated as low as 0.6V. Constant-On-Time Control When compared to fixed-frequency PWM control, constant on-time control offers a simpler control loop and faster transient respo nse. By using input-voltage feed -forward, the MPQ2143H maintains a nearly constant switching frequency across the entire input and output voltage range. The switching pulse ON time can be estimated as: Ton=VOUT/VIN×0.500µs To prevent inductor curren t runaway during the load transient, the MPQ2143H has a fixed minimum OFF time of 50ns. However, this minimum OFF time limit does not affect the operation of the MPQ2143H in steady state in any way. Enable When the input voltage exceeds the under- voltage lockout (UVLO) threshold—typically 2.2V—the MPQ2143H is enabled by pulling the EN pin above 1.2V. Leaving the EN pin floating or grounded will disable the MPQ2143H. There is an internal 1MΩ resistor from the EN pin to ground. Soft-Start/Stop MPQ2143H has a built-in soft -start that ramps up the output voltage at a constant slew rate that avoids overshooting at startup. The soft - start time is typically about 1.3ms. When disabled, the MPQ2143H ramps down the internal reference voltage to allow the load to linearly discharge the output. Power Good Indicator MPQ2143H has an open drain with 500kΩ pull - up resistor pin for power good (PG) indication. When the FB pin is with in ±10% of regulation voltage (0.6V), the PG pin is pulled up to VIN by the internal resistor. If the FB pin voltage is outside the ± 10% window, the PG pin is pulled to ground by an internal MOSFET. The MOSFET has a maximum R dson of less than 100Ω. Current Limit The MPQ2143H has a 4.5A current limit for the high side switch (HS-FET). When the HS-FET hits its current limit, the MPQ2143H enters hiccup mode until the current drops to prevent the inductor current from build ing and possibly damaging the components. Short Circuit and Recovery The MPQ2143H also enters short -circuit protection (SCP) mode when it hits the current limit, and tries to recover from the short circuit by entering hiccup mode. In SCP, the MPQ2143H disables the output power stage, discharges a soft-start cap acitor, and then enacts a soft-start procedure. If the short -circuit condition still holds after soft -start ends, the MPQ2143H repeats this operation until the short circuit ceases and output rises ba ck to regulation level.
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 12 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved.
APPLICATION INFORMATION
Setting the Output Voltage The external resistor divider set s the output voltage (see the Typical Application schematic on page 1). The feedback resistor R1 must account for both sta bility and dynamic response, and thus can not be too large or too small. Choose an R1 value between 120kΩ and 200kΩ. R2 is then given by: out R1R2 V 10.6 The feedback circuit is shown as Figure 2. Figure 2: Feedback Network Table 1 lists the recommended resistors value s for common output voltages. Table 1: Resistor Values for Common Output Voltages VOUT (V) R1 (kΩ) R2 (kΩ) Selecting the Inductor A 0.47µH to 1.5µH inductor is recommended for most applications. For highest efficiency, chose an inductor with a DC resistance less than 15mΩ. For most designs, the inductance value can be derived from the following equation. OUT IN OUT IN L OSC V (V V )L V I f Where ΔIL is the inductor ripple current. Choose an inductor current to be approximately 30% of the maximum load curr ent. The maximum inductor peak current is: L L(MAX) LOAD III 2 Selecting the Input Capacitor The input current to the step -down converter is discontinuous, and requires a capacitor to supply the AC current to the step -down converter while maintaining t he DC input voltage. Use low -ESR capacitors for the best performance. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR values and small temperature coefficients. For most applications, a 10µF capacitor is sufficient. For higher output voltage, use 47μF to improve system stability. Since the input capacitor absorbs the input switching current it requires an adequate ripple current rating. The RMS current in the input capacitor can be estimated by: IN OUT IN OUTLOAD1C V V1V VII The worse case condition occurs at VIN = 2VOUT, where: II LOAD 1C For simplification, choose an input capacitor whose RMS current rating greater than half of the maximum load current. The input capacitor can be electrolytic, tantalum or ceramic. When using electrolytic or tantalum capacitors, use a small high -quality ceramic capacitor (0.1μF), placed as close to the IC as possible. When using ceramic capacitors, make sure that they have enough capacitance to prevent excessive voltage ripple at input. The input voltage ripple caused by capacitance can be estimated by: LOAD OUT OUT IN INS IN I V VV1 f C1 V V
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 13 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. Selecting the Output Capacitor The output capacitor (C2) maintain s the output DC voltage. Use ceramic capacitors. Low-ESR capacitors keep the output voltage ripple low. The output voltage ripple can be estimated by: OUT OUT OUT ESR S 1 IN S VV 1V 1 R f L V 8 f C2 Where L1 is the inductor value and R ESR is the equivalent series resistance of the output capacitor. Using ceramic capacitors, the impedance at the switching frequency is dominated by the capacitance. The output voltage ripple is mainly caused by the capacitance. Fo r simplification, the output voltage ripple can be estimated by: OUT OUT OUT 2 INS1 VVΔV 1 V8 f L C2 For tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple can be approximated as: OUT OUT OUT ESR INS1 VVΔV 1 Rf L V The characteristics of the output capacitor also affect the stability of the regulation system. PCB Recommendation of MPQ2143H Proper layout of the switching power supplies is very important, and sometimes critical for proper operation. For high-frequency switching converters, poor layout could lead to poor line or load regulation and stability issues. The high current paths (GND, IN, and SW) should be placed very close to the device using short, direct, and wide traces. The inp ut capacitor needs to be as close as possible to the IN and GND pins. The external feedback resistors should be placed next to the FB pin. Keep the switching node SW short and away from the feedback network. VOUT SW VIN GND GND R1 R2 Figure 3: Layout Recommendation
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MPQ2143H Rev. 1.0 www.MonolithicPower.com 14 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL APPLICATION CIRCUITS GND FB VIN EN 2.5V to 5.5V 1.5V/3A SW 22µF 200kΩ 133kΩ EN OUT 0.47µH 499kΩ C1A 10µF C2A NS MPQ2143H10µF PGPG VIN VOUT9 8 3,6,7 Figure 4: MPQ2143H Typical Application Circuit
MPQ2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party I ntellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MPQ2143H Rev. 1.0 www.MonolithicPower.com 15 8/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved.
PACKAGE INFORMATION
QFN-10 (2mmx3mm)