MP2174C MPSIND | Alldatasheet
Document overview
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Technical content
2.7V-5.5V,4A, High-Efficiency, Synchronous Step-Down Converter with Forced CCM in 2×2mm QFN MP2174C Rev. 1.0 www.MonolithicPower.com 1 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.
DESCRIPTION
The MP2174C is a monolithic , step-down, switch mode converter with built -in, internal power MOSFETs. It achieves 4A of continuous output current from a 2.7V to 5.5V input voltage with excellent load and line regulation. The output voltage can be regulated as low as 0.6V. The constant-on-time (COT) control scheme provides fast transient response and easy loop stabilization. Fault condition protection s include cyclebycycle current limit and thermal shutdown. The MP2174C requires a minim al number of readily available , standard external components, and is available in an ultra -small QFN-12 (2mmx2mm) package. The MP2174C is ideal for a wide range of applications, including PDAs, portable instruments, DVD drives, and small handh eld devices.
FEATURES
Forced PWM Mode Operation Wide 2.7V to 5.5V Operating Input Range Output Voltage as Low as 0.6V 4A Output Current 35mΩ and 18mΩ Internal Power MOSFET Peak Efficiency Above 96% 1.1MHz Frequency 100% Duty Cycle in Dropout 0.5ms Internal Soft-Start Time EN and Power Good for Power Sequencing Auto-Discharge at Power-Off Short-Circuit Protection with Hiccup Mode Available in a QFN-12 (2mmx2mm) Package
APPLICATIONS
Storage Drives Portable/Handheld Devices Low-Voltage I/O System Power All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries. TYPICAL APPLICATION 1µH 22µF 22µF VOUT 1.2V/4A VIN EN PG MP2174C EN PG PVIN VIN SW OUT FB NC AGND PGND 200k 200k Efficiency vs. Output Current VIN = 5V, DCR = 27mΩ 100 EFFICIENCY (% ) OUTPUT CURRENT (A) Vout=1.2V Vout=1.8V Vout=2.5V Vout=3.3V
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 2 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking MP2174CGG QFN12 (2mm x 2mm) See Below * For Tape & Reel, add suffix –Z (e.g. MP2174CGG–Z). TOP MARKING KC: Product code of MP2174CGG Y: Year code LLL: Lot number PACKAGE REFERENCE QFN-12 (2mmx2mm) PIN FUNCTIONS Pin # Name Description 1 PVIN Supply voltage to power FETs. PVIN is connected to VIN internally. 2, 11 SW Switch output. Pin 2 and 11 can be connected together. 3, 12 PGND Power ground. Pin 3 and 12 can be connected together. 4 AGND Quiet ground for controller circuits. 5 NC No connection. Leave this pin open. Do not connect it to ground. 6 OUT Input sense pin for output voltage. 7 FB Feedback. An external resistor divider from the output to GND, ta pped to the FB pin, sets the output voltage. 8 EN On/off control. 9 PG Power good indicator. The output of this pin is an open drain pin. 10 VIN Supply voltage to internal control circuitry. VIN is connected to PVIN internally.
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 3 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. ABSOLUTE MAXIMUM RATINGS (1) -0.3V (-3V for <10ns) to +6.5V (8V for <10ns) Continuous power dissipation (TA = 25°C) (2) Recommended Operating Conditions (3) Operating junction temp (TJ) .... -40°C to +125°C Thermal Resistance θJA θJC QFN-12 (2mmx2mm) 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 maxim um 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 regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on EV2174C-G-00A, 2-layer PCB, 63mmx63mm. 5) Measured on JESD51-7, 4-layer PCB. The value of θJA given in this table is only valid for comparison with other packages and cannot be used for de sign purposes. These values are calculated in accordance with JESD51 -7, and simulated on a specified JEDEC board. They do not represent the performance obtained in an actual application.
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 4 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = 3.6V, TA = -40°C to +125°C (6), typical value is tested at TJ = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Feedback voltage VFB 2.7V ≤ VIN ≤ 5.5V TJ = 25°C 594 600 606 mV Feedback voltage VFB 2.7V ≤ VIN ≤ 5.5V 588 600 612 mV Feedback current IFB VFB = 0.63V 10 50 nA PFET switch on resistance RDSON_P VIN = 5V 35 mΩ NFET switch on resistance RDSON_N VIN = 5V 18 mΩ Switch leakage VEN = 0V, VIN = 5.5V, VSW = 0V and 5.5V, TJ = 25°C 0 5 μA PFET peak current limit (7) TJ = 25°C 5 6.5 A NFET valley current limit (7) 4.5 A On time tON VIN = 5V, VOUT = 1.2V 220 ns VIN = 3.6V, VOUT = 1.2V 300 Switching frequency fSW VOUT = 1.2V 1100 kHz Minimum off time tMIN-OFF 100 ns Minimum on time (7) tMIN-On 80 ns Soft-start time tSS-ON From 10% VOUT to 90% VOUT 0.5 1 ms Soft-stop time tSS-OFF From 90% VOUT to 10% VOUT 0.3 ms EN off delay VEN off to 90% VOUT drop 0.4 ms Power good upper trip threshold FB with respect to the regulation +10 % Power good lower trip threshold -10 % Power good delay Rising 90 μs Power good sink current capability VPG_LO Sink 1mA 0.4 V Power good logic high voltage VPG_HI VIN = 5V, VFB = 0.63V 4.9 V Under-voltage lockout threshold rising -40°C ≤ TJ ≤ +85°C 2.48 2.68 V Under-voltage lockout threshold hysteresis 450 mV
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 5 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (continued) VIN = 3.6V, TA = -40°C to +125°C (6), typical value is tested at TJ = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units EN turn-on delay (7) EN on to SW active 255 μs EN rising threshold 0.5 0.65 0.9 V EN hysteresis 0.09 V EN input current VEN = 2V 2 μA VEN = 0V 0 μA Supply current (shutdown) VEN = 0V, TJ = 25°C 0 1 μA Supply current (quiescent) VEN = 2V, VFB = 0.63V, VIN = 3.6V, TJ = 25°C 500 μA Thermal shutdown (7) 155 °C Thermal hysteresis (7) 25 °C Notes: 6) Not tested in production. Guaranteed by over-temperature correlation. 7) Guaranteed by engineering sample characterization.
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 6 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 5V, VOUT = 1.2V, L = 1µH, TA = 25°C, unless otherwise noted. Efficiency vs. Output Current VIN = 3.3V Efficiency vs. Output Current VIN = 5V 100 EFFICIENCY (% ) OUTPUT CURRENT (A) Vout=1.2V Vout=1.8V 100 EFFICIENCY (% ) OUTPUT CURRENT (A) Vout=1.2V Vout=1.8V Vout=2.5V Vout=3.3V Load Regulation vs. Output Current VIN = 3.6V/5V, IOUT = 0.1A to 4A Line Regulation vs. Output Current VIN = 2.7V to 5.5V -0.5 -0.4 -0.3 -0.2 -0.1 0.1 0.2 0.3 0.4 0.5 LOAD REGULATION (% ) OUTPUT CURRENT (A) Vin=3.6V, Vout=1.2V Vin=5V, Vout=1.2V -0.8 -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 2 2.5 3 3.5 4 4.5 5 5.5 6 LINE REGULATION (% ) INPUT VOLTAGE (V) Iout=0A Iout=2A Iout=4A VIN UVLO vs. Temperature EN Threshold vs. Temperature 1.8 1.9 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 -40 -20 0 20 40 60 80 100 120 VIN UVLO VOLTAGE (V) AMBIENT TEMPERATURE (⁰C) UVLO Rising UVLO Falling 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -40 -20 0 20 40 60 80 100 120 EN THRESHOLD (V) AMBIENT TEMPERATURE (⁰C) EN Rising Threshold EN Falling Threshold
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 7 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT = 1.2V, L = 1µH, TA = 25°C, unless otherwise noted. Reference Voltage vs. Temperature Thermal Rise vs. Output Current 580 585 590 595 600 605 610 615 620 -40 -20 0 20 40 60 80 100 120 REFERENCE VOLTAGE (mV) AMBIENT TEMPERATURE (⁰C) 0 1 2 3 4 5 THERMAL RISE (⁰C) OUTPUT CURRENT (A) Vin=3.6V, Vout=1.2V Vin=5V, Vout=1.2V Vin=5V, Vout=3.3V
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 8 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT = 1.2V, L = 1µH, TA = 25°C, unless otherwise noted. Output Ripple VIN = 3.6V, VOUT = 3.3V, IOUT = 0A Output Ripple VIN = 5V, VOUT = 1.2V, IOUT = 0A CH1: VOUT/AC 10mV/div. CH2: VIN 2V/div. CH3: VSW 2V/div. CH4: IL 500mA/div. CH1: VOUT/AC 10mV/div. CH2: VIN 5V/div. CH3: VSW 2V/div. CH4: IL 2A/div. 4μs/div. 1μs/div. Output Ripple VIN = 5V, VOUT = 1.2V, IOUT = 4A Transient IOUT = 2A to 4A, 2.5A/μs CH1: VOUT/AC 5mV/div. CH2: VIN 5V/div. CH3: VSW 2V/div. CH4: IL 2A/div. CH1: VOUT/AC 50mV/div. CH3: VSW 5V/div. CH4: IOUT 2A/div. 1μs/div. 100μs/div. VIN Start-Up IOUT = 0A VIN Start-Up IOUT = 4A CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 1A/div. CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. 1ms/div. 1ms/div.
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 9 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT = 1.2V, L = 1µH, TA = 25°C, unless otherwise noted. VIN Shutdown IOUT = 0A VIN Shutdown IOUT = 4A CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 1A/div. CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. 40ms/div. 20ms/div. EN Start-Up IOUT = 0A EN Start-Up IOUT = 4A CH1: VOUT 1V/div. CH2: VEN 5V/div. CH3: VSW 5V/div. CH4: IL 1A/div. CH1: VOUT 1V/div. CH2: VEN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. 1ms/div. 1ms/div. EN Shutdown IOUT = 0A EN Shutdown IOUT = 4A CH1: VOUT 1V/div. CH2: VEN 5V/div. CH3: VSW 5V/div. CH4: IL 1A/div. CH1: VOUT 1V/div. CH2: VEN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. 100μs/div. 100μs/div.
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 10 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT = 1.2V, L = 1µH, TA = 25°C, unless otherwise noted. SCP Entry IOUT = 4A SCP Recovery IOUT = 4A CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. 400μs/div. 400μs/div. SCP State IOUT = 4A SCP Entry IOUT = 0A CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. 400μs/div. 1ms/div. SCP Recovery IOUT = 0A CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 5A/div. 1ms/div.
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 11 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 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 PVIN /VIN FBCOMP EN Driver PDRV NDRV Soft Start PGND OUT PWM COMP PG Hi-Z E.A. Ramp Generator COMP VOUT RST SW Low IQ VTH COMP AGND 0.66V 0.54V Figure 1: Functional Block Diagram
MP2174C – 5.5V, 4A, 1.1MHZ, SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 12 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. OPERATION The MP2174C uses constant -on-time control with input voltage feed forward to stabilize the switching frequency over the full input range. Constant-On-Time Control Compare to fixed -frequency PWM control, constant-on-time control offers the advantage of a simpler control loop and faster transient response. By using input voltage feed forward, the MP2174C maintains a nearly constant switching frequency across the input and output voltage range s. The on -time of the switching pulse can be estimated with Equation (1): OUT ON IN Vt 0.909 sV (1) To prevent inductor current runaway during load transient, the MP2174C limits the minimum off time to 100ns. This minimum off time limit does not affect the operation of the MP2174C in steady state in any way. Forced PWM Operation The MP2174C works in continuous conduction mode (CCM) to achieve a smaller V O ripple, load regulation, and load transient across the full load range. Enable When the input voltage exceeds the under - voltage lockout (UVLO) threshold (typically 2.5V), the MP2174C can be enabled by pulling the EN pin above 0.65V (typical). Leaving EN below 0.55V (typical) or float ing it disables the MP2174C. There is an internal 1M Ω resistor from the EN pin to ground. When EN is pull ed down, there is a discharge path for output. All processes, from EN turning off to the output dropping to 0V, take less than 0.8ms. Soft Start/Stop The MP2174C has a built-in soft start that ramps up the output voltage in a controlled slew rate, avoiding overshoot at start -up. The soft - start time is typically about 0.5ms. When disabled, the MP2174C ramps down the internal reference and allows the load to linearly discharge the output. The soft-stop time is less than 0.3ms. Power Good Indicator The MP2174C has an open -drain output. The PG pin requires an external pull-up resistor (100kΩ to 500kΩ) for the power good indicator. When the FB pin is within ±10% of the regulation voltage (i.e. 0.6V), the PG pin is pulled up. I f the FB voltage is out of the ±10% window, PG is pulled down to ground by an internal MOSFET. The MOSFET has a maximum RDS(ON) of less than 100Ω. Current Limit The MP2174C has a typical 6.5A current limit for the HS-FET, and a 4.5A current limit for the LS-FET. Once the high-side switch hits current limit, the MP2174C turns off the HS -FET and turns on the LS-FET to reduce the inductor current. When the inductor current drops to the valley current limit, the LS-FET turns off and the HS-FET turn s on. If the HS -FET reaches the peak current limit and the LS -FET reaches the valley current limit every cycle f or 150µs, the MP2174C remains in hiccup mode until the current decreases. This prevent s the inductor current from continuing to build up , which could result in damage to the components. Short Circuit and Recovery If the output voltage of the buck converter is shorted to GND, the current limit is triggered. If the current limit is triggered every cycle for 150µs, the MP2174C enters hiccup mode . It disables the output power stage, discharges the soft-start capacitor, and then automatically retries soft start. If the short-circuit condition still remains after soft start ends, the MP2174C repeats this operation cycle until the short condition is removed and the output rises back to the regulation level.
MP2174C – 5.5V, 4A, 1.1MHZ SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 14 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. Selecting the Output Capacitor An output capacitor (C2) is required to maintain the DC output voltage. Low-ESR ceramic capacitors can be used with the MP2174C to keep the output rip ple low. Generally, a 10μF output ceramic capacitor is sufficient. In higher output voltage condition s, a 22μF capacitor may be needed for system stability. Using ceramic capacitors, the capacitance dominates the impedance at the switching frequency, and i s the main cause of the output voltage ripple. For simplification, the output voltage ripple can be estimated with Equation (8): OUT OUT OUT 2 SW 1 IN VVΔV1 8 f L C2 V (8) For tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple can be estimated with Equation (9): OUT OUT OUT ESR INSW 1 VVΔV 1 R f L V (9) The characteristics of the output capacitor also affect the stability of the regulation system. PCB Layout Guidelines Efficient PCB layout is critical for stable operation. For best results, refer to Figure 3 and follow the guidelines below: 1. Place the input decoupling capacitor as close as possible to the IC pins , pin 1 and pin 3 (an 0805 ceramic capacitor is used). 2. Ensure the two ends of t he ceramic capacitor are connected directly to PVIN (pin 1) and PGND (pin 3). PG EN VIN GND VOUT SW R1L1 C1C2 SW VIN GND Top Layer Bottom Layer Figure 3: Recommended PCB Layout
MP2174C – 5.5V, 4A, 1.1MHZ SYNCHRONOUS STEP-DOWN SWITCHER MP2174C Rev. 1.0 www.MonolithicPower.com 15 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL APPLICATION CIRCUIT 1µH 22µF 22µF VOUT 1.2V/4A VIN EN PG MP2174C EN PG PVIN VIN SW OUT FB NC AGND PGND 200k 200k Figure 4: 5VIN, 1.2 V/4A
MP2174C – 5.5V, 4A, 1.1MHZ 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 Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP2174C Rev. 1.0 MonolithicPower.com 16 8/7/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.
PACKAGE INFORMATION
QFN-12 (2mmx2mm) PACKAGE OUTLINE DRAWING FOR 12L FCQFN (2X2MM) -2 MF-PO-D-0092 revision 3.0 SIDE VIEW BOTTOM VIEW NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETERS MAX. 4) JEDEC REFERENCE IS MO-220. 5) DRAWING IS NOT TO SCALE. PIN 1 ID MARKING TOP VIEW PIN 1 ID INDEX AREA RECOMMENDED LAND PATTERN PIN 1 ID 0.10X45º TYP