MP2141Q MPS | Alldatasheet
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1.5A, Synchronous Step-Down Converter with VSEL Pin MP2141Q Rev. 1.0 www.MonolithicPower.com 1 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
DESCRIPTION
The MP2141Q is a monolithic, step -down, switch-mode converter with built -in, internal power MOSFETs. The MP2141Q achieves 1.5A of continuous output currents from a 2. 3V to 5.5V input voltage with excellent load and line regulation. The constant-on-time (COT) control scheme provides fast transient response and eases loop stabilization. Fault protections include cycle -by- cycle current limiting and thermal shutdown. The MP2141Q is ideal for a wide range of applications including high performance DSPs, wireless power, portable and mobile devices, and other low-power systems. The MP2141Q requires a minimal number of readily available , standard, external components and is available in a n ultra-small SOT563 package.
FEATURES
PFM Quiescent Current: 20μA EN for Power Sequencing VSEL for PFM/PWM Wide 2.3V to 5.5V Operating Input Range Fixed Output Voltage: 0.61V/1.8V Up to 1.5A of Output Current 120mΩ and 80mΩ Internal Power MOSFET Switches Output Discharging Short-Circuit Protection (SCP) with Hiccup Mode Stable with Low ESR Output Ceramic Capacitors 100% Duty Cycle Available in a SOT563 Package
APPLICATIONS
DDR/Codec Portable Instruments Battery-Powered Devices All MPS parts are lead -free, halogen -free, and adhere to the RoHS directive. For MPS green st atus, please visit the MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP2141Q-18 or MP2141Q-06 GND VSEL VIN 10μF EN VIN VOUT 1.8V/1.5A or 0.61V/1.5A SW 22μF EN OUT 0.47μH PFM PWM 50.000 55.000 60.000 65.000 70.000 75.000 80.000 85.000 90.000 95.000 100.000 0.001 0.010 0.100 1.000 EFFICIENCY(%) IOUT (A) Efficiency vs. Output Current VIN=3.6V Base on VLS252010HBX-R47M(DCR=29mΩ) Vout=1.8V Vout=0.61V
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 2 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking VOUT Range MP2141QGTF-06** SOT563 See Below Fixed 0.61V MP2141QGTF-18 See Below Fixed 1.8V * For Tape & Reel, add suffix –Z (e.g. MP2141QGTF-06–Z); * For Tape & Reel, add suffix –Z (e.g. MP2141QGTF-18–Z); **-06 version is not released now. Contact Factory for detail. TOP MARKING AZG: Product code of MP2141QGTF-06 Y: Year code LLL: Lot number TOP MARKING AZH: Product code of MP2141QGTF-18 Y: Year code LLL: Lot number PACKAGE REFERENCE TOP VIEW VSEL GND VIN SW EN OUT1 3 4 SOT563
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 3 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. ABSOLUTE MAXIMUM RATINGS (1) 6V (8V for <10ns) Continuous power dissipation (TA = +25° C) (2)(4) Recommended Operating Conditions (3) Operating junction temp. (TJ). .. -40°C to +125°C Thermal Resistance SOT563 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 TJ (MAX), the junction-to- ambient thermal resista nce 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 produces an excessive die temperature, causing the regulator to 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 EV2141Q-TF-00A, 2-layer PCB. 5) Measured on JESD51-7, 4-layer PCB.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 4 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = 3.6V, T J = -40° C to +125° C (6), 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 VIN range 2.3 5.5 V Under-voltage lockout threshold rising 2 2.25 V Under-voltage lockout threshold hysteresis 150 mV Supply current (shutdown) VEN = 0V, TJ = 25°C 0 1 μA Supply current (quiescent) VEN = 2V, no switching, VIN = 5V, PFM, TJ = 25°C 20 30 μA VEN = 2V, no switching, VIN = 5V, PWM 620 μA Fixed output voltage For MP2141Q-06, 2.3V ≤ VIN ≤ 5.5V, TJ = 25° C 0.604 0.610 0.616 V For MP2141Q-06, 2.3V ≤ VIN ≤ 5.5V, TJ = -40° C to +125° C 0.598 0.610 0.622 V For MP2141Q-18, 2.3V ≤ VIN ≤ 5.5V, TJ = 25° C 1.782 1.8 1.818 V For MP2141Q-18, 2.3V ≤ VIN ≤ 5.5V, TJ = -40° C to +125° C 1.764 1.8 1.836 V P-FET switch on resistance RDSON_P VIN = 5V 120 mΩ N-FET switch on resistance RDSON_N VIN = 5V 80 mΩ Switch leakage VEN = 0V, VIN = 6V, VSW = 0V or 6V, TJ = 25° C 1 μA Switching frequency fs VIN = 3.6V, VOUT = 1.8V, CCM, Io = 0A, TJ = 25° C (7) 1760 2200 2640 kHz VIN = 3.6V, VOUT = 1.8V, CCM, Io = 0A, TJ = -40° C to +125° C (7) 1650 2200 2750 kHz Minimum on time (7) TMIN-ON VIN = 3.6V 60 ns Minimum off time TMIN-OFF VIN = 3.6V 60 ns On time TON VIN = 5V, VOUT = 1.8V 160 ns VIN = 3.6V, VOUT = 1.8V 230 P-FET peak current limit Sourcing 2 2.7 A N-FET valley current limit Sourcing, valley current limit 1.5 A ZCD (6) PFM 0 mA Soft-start time TSS-ON VOUT rise from 10% to 90% 400 μs Maximum duty cycle 100 % VSEL input logic low voltage 0.4 V VSEL input logic high voltage 1.2 V VSEL delay PFM to PWM (7) 5 μs VSEL delay PWM to PFM (7) 10 μs VSEL pull-down resistor RVSEL 1 MΩ
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 5 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (continued) VIN = 3.6V, T J = -40° C to +125° C (6), 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 turn on delay EN on to SW active 100 μs EN turn off delay (7) EN off to stop switching 20 μs EN input logic low voltage 0.4 V EN input logic high voltage 1.2 V EN pull-down resistor REN 0.78 MΩ Output discharge resistor RDIS VEN = 0V 250 Ω EN input current VEN = 2V 1.2 μA VEN = 0V 0 μA Thermal shutdown (7) 160 °C Thermal hysteresis (7) 30 °C System Level Recommended input capacitance CIN VIN = 3.6V, VOUT = 1.8V, IOUT = 1.5A 10 μF Recommended inductance L 0.47 2.2 μH Output capacitance COUT VIN = 3.6V, VOUT = 1.8V, IOUT = 1.5A 10 47 μF Output ripple VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22µF, CCM 10 mV Load regulation VIN = 3.6V, VOUT = 1.8V, CCM, from 0A to 1.5A 1 % Line regulation VIN from 2.3 to 5.5V, VOUT = 1.8V, IOUT = 1.5A 0.5 % Efficiency VIN = 3.6V, VOUT = 1.8V, IOUT = 1A, L_DCR = 29mΩ 90 % NOTES: 6) No production test, guaranteed by over-temperature correlation. 7) Guaranteed by engineering sample characterization.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 6 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22μF, TA = +25°C, unless otherwise noted. Quiescent Current vs. Input Voltage PFM Shutdown Current vs. Input Voltage VEN = 0V 2 3 4 5 6 QUIESCENT CURRENT(uA) INPUT VOLTAGE (V) -0.2 0.0 0.2 0.4 0.6 0.8 1.0 2 3 4 5 6 SHUTDOWN CURRENT(uA) INPUT VOLTAGE (V) Load Regulation vs. Output Current VIN = 3.6V, PFM Line Regulation vs. Input Voltage VOUT = 1.8V, PFM -1.0% -0.8% -0.6% -0.4% -0.2% 0.0% 0.2% 0.4% 0.6% 0.8% 1.0% LOAD REGULATION (%) OUTPUT CURRENT(A) Vout=1.8V Vout=0.61V -0.5% -0.4% -0.3% -0.2% -0.1% 0.0% 0.1% 0.2% 0.3% 0.4% 0.5% 2 3 4 5 6 LINE REGULATION(%) INPUT VOLTAGE(V) Io=0.1A Io=0.5A Io=1.5A Load Regulation vs. Output Current VIN = 3.6V, PWM Line Regulation vs. Input Voltage VOUT = 1.8V, PWM -1.0% -0.8% -0.6% -0.4% -0.2% 0.0% 0.2% 0.4% 0.6% 0.8% 1.0% LOAD REGULATION (%) OUTPUT CURRENT(A) Vout=1.8V Vout=0.61V -0.5% -0.4% -0.3% -0.2% -0.1% 0.0% 0.1% 0.2% 0.3% 0.4% 0.5% 2 3 4 5 6 LINE REGULATION(%) INPUT VOLTAGE(V) Iout=0.1A Iout=0.5A Iout=1.5A
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 7 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22μF, TA = +25°C, unless otherwise noted. Case Temperature Rise vs. Output Current VIN = 3.6V, PFM Efficiency vs. Output Current VOUT = 1.8V, PFM Based on VLS252010HBX-R47M (DCR = 29mΩ) 0 0.5 1 1.5 CASE TEMPERATURE RISE(°C) OUTPUT CURRENT(A) Vout=1.8V Vout=0.61V 0.001 0.01 0.1 1 10 EFFICIENCY(%) IOUT(A) Vin=5V Vin=4.2V Vin=3.6V Efficiency vs. Output Current VOUT = 0.61V, PFM Based on VLS252010HBX-R47M (DCR = 29mΩ) Efficiency vs. Output Current VOUT = 1.8V, PWM Based on VLS252010HBX-R47M (DCR = 29mΩ) 0.001 0.01 0.1 1 10 EFFICIENCY(%) IOUT (A) Vin=5V Vin=4.2V Vin=3.6V 100 0.01 0.1 1 10 EFFICIENCY(%) IOUT (A) Vin=5V Vin=4.2V Vin=3.6V Efficiency vs. Output Current VOUT = 0.61V, PWM Based on VLS252010HBX-R47M (DCR = 29mΩ) Current Limit vs. Input Voltage 0.01 0.1 1 10 EFFICIENCY(%) IOUT (A) Vin=5V Vin=4.2V Vin=3.6V 1.5 2.5 3.5 2 3 4 5 6 CURRENT LIMIT(A) INPUT VOLTAGE(V)
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 8 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22μF, TA = +25°C, unless otherwise noted. Quiescent Current vs. Temperature VIN UVLO Rising and Falling Threshold vs. Temperature -60 -40 -20 0 20 40 60 80 100 QUIESCENT CURRENT(uA) TEMPERATURE(°C) 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 -60 -40 -20 0 20 40 60 80 100 VIN UVLO(V) TEMPERATURE(°C) Rising Falling EN Rising and Falling Threshold vs. Temperature Reference vs. Temperature 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -60 -40 -20 0 20 40 60 80 100 EN RISING AND FALLING THRESHOLD(V) TEMPERATURE(°C) Rising Falling 0.590 0.595 0.600 0.605 0.610 -60 -40 -20 0 20 40 60 80 100 REFERENCE VOLTAGE(V) TEMPERATURE (°C) Current Limit vs. Temperature 1.0 1.5 2.0 2.5 3.0 -60 -40 -20 0 20 40 60 80 100 CURRENT LIMIT(A) TEMPERATURE (°C)
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 9 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22μF, TA = +25°C, unless otherwise noted. Steady State without load, PFM Steady State with 1.5A load, PFM CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. 10ms/div. 500ns/div. Steady State without load, PWM Steady State with 1.5A load, PWM CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 1A/div. CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. 500ns/div. 500ns/div. Steady State VIN = 5V, VOUT = 1.8V, without load, PFM Steady State VIN = 5V, VOUT = 1.8V, with 1.5A load, PFM CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. 20ms/div. 500ns/div.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 10 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22μF, TA = +25°C, unless otherwise noted. Steady State VIN = 5V, VOUT = 0.61V, without load, PFM Steady State VIN = 5V, VOUT = 0.61V, with 1.5A load, PFM CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 500mA/div. CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. 50ms/div. 500ns/div. Steady State VIN = 3.6V, VOUT = 0.61V, without load, PFM Steady State VIN = 3.6V, VOUT = 0.61V, with 1.5A load, PFM CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. 20ms/div. 500ns/div. Steady State VIN = 3.6V, VOUT = 0.61V, without load, PWM Steady State VIN = 3.6V, VOUT = 0.61V, with 1.5A load, PWM CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 1A/div. CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IL 2A/div. 500ns/div. 500ns/div.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 11 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22μF, TA = +25°C, unless otherwise noted. VIN Power-Up without load, PFM VIN Shutdown without load, PFM CH1: VOUT 1V/div. CH2: VIN 2V/div. CH3: VSW 2V/div. CH4: IL 500mA/div. CH1: VOUT 1V/div. CH2: VIN 2V/div. CH3: VSW 2V/div. CH4: IL 500mA/div. 1ms/div. 50ms/div. VIN Power-Up with 1.5A load, PFM VIN Shutdown with 1.5A load, PFM CH1: VOUT 1V/div. CH2: VIN 2V/div. CH3: VSW 2V/div. CH4: IL 2A/div. CH1: VOUT 1V/div. CH2: VIN 2V/div. CH3: VSW 2V/div. CH4: IL 2A/div. 500µ s/div. 2ms/div. EN Start-Up without load, PFM EN Shutdown without load, PFM CH1: VOUT 1V/div. CH2: VEN 5V/div. CH3: VSW 2V/div. CH4: IL 500mA/div. CH1: VOUT 1V/div. CH2: VEN 5V/div. CH3: VSW 2V/div. CH4: IL 500mA/div. 200µ s/div. 50ms/div.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 12 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22μF, TA = +25°C, unless otherwise noted. EN Start-Up with 1.5A load, PFM EN Shutdown with 1.5A load, PFM CH1: VOUT 1V/div. CH2: VEN 5V/div. CH3: VSW 2V/div. CH4: IL 2A/div. CH1: VOUT 1V/div. CH2: VEN 5V/div. CH3: VSW 2V/div. CH4: IL 2A/div. 200µ s/div. 1ms/div. Load Transient Response IOUT = 0A to 1.5A, PFM Load Transient Response IOUT = 0A to 1.5A, PWM CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IOUT 2A/div. CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IOUT 2A/div. 100µ s/div. 100µ s/div. Load Transient Response VIN = 3.6V, VOUT = 0.61V, IOUT = 0A to 1.5A, PFM Load Transient Response VIN = 3.6V, VOUT = 0.61V, IOUT = 0A to 1.5A, PWM CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IOUT 2A/div. CH1: VOUT/AC 50mV/div. CH2: VIN 5V/div. CH1: VSW 2V/div. CH4: IOUT 2A/div. 100µ s/div. 100µ s/div.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 13 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.6V, VOUT = 1.8V, L = 0.47μH, COUT = 22μF, TA = +25°C, unless otherwise noted. Short-Circuit Entry PFM Short Circuit PFM CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 2A/div. CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH4: IL 2A/div. 500µ s/div. 500µ s/div. Short-Circuit Recovery PFM VSEL Rising with 10mA load CH1: VOUT 1V/div. CH2: VIN 5V/div. CH3: VSW 2V/div. CH4: IL 2A/div. CH1: VOUT 50mV/div. CH2: VSEL 2V/div. CH3: VSW 2V/div. CH4: IL 1A/div. 500µ s/div. 200µ s/div. VSEL Falling with 10mA load CH1: VOUT 50mV/div. CH2: VSEL 2V/div. CH3: VSW 2V/div. CH4: IL 1A/div. 200µ s/div.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 14 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 VSEL PWM and PFM selection. When VSEL is above 1.2V, the MP2141Q enters PWM mode. When VSEL is below 0.4V or floating, the MP2141Q enters PFM mode. 2 GND Power ground.
3 VIN
Supply voltage. The MP2141Q operates on a +2.3V to +5.5V unregulated input. A decoupling capacitor is needed to prevent large voltage spikes from appearing at the input. 4 SW Output switching node. SW is the drain of the internal high -side P-channel MOSFET. Connect the inductor to SW to complete the converter. 5 EN On/off control. 6 OUT Output voltage power rail and input sense. Connect the load to OUT. An output capacitor is needed to decrease the output voltage ripple.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 15 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. BLOCK DIAGRAM Main Switch (PCH) Synchronous Rectifier ( NCH) Constant On- Time Pulse PWM Bias Voltage Reference 0.6V EN SW COMP VIN FBCOMP EN Driver PDRV NDRV Soft start GND OUT PWM VSEL Hi-Z E.A. Ramp generator COMP VOUT RST SW Lo-Iq Lo-Iq Lo-Iq Lo-Iq Lo-Iq VTH PFM/PWM EN-Z Figure 1: Functional Block Diagram
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 18 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. When the device is disabled, the part enters output discharge mode automatically , and its internal discharge MOSFET provides a resistive discharge path for the output capacitor. Soft Start (SS) The MP2141Q has a built -in soft start that ramps up the output voltage at a controlled slew rate to avoid overshoot ing at start -up. The maximum soft-start time is about 0.4ms. Current Limit The MP2141Q has a typical 2.7A high-side switch current limit. When the high -side switch reaches its current limit, the MP2141Q remains in hiccup mode until the current drops. This prevents the inductor current from continuing to rise and damaging components. Short-Circuit and Recovery The MP2141Q also enter s short-circuit protection mode when it reaches the current limit and attempts to recover with hiccup mode . The MP2141Q disables the output power stage, discharges the soft -start capacitor , and attempts to soft start again automatically. If the short-circuit condition remains after the soft start ends, the MP2141Q repeats this cycle until the short circuit disappears and the output rises back to the regulation level.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 19 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
APPLICATION INFORMATION
Selecting the Output Inductor Most applications work best with a 0.47µ H to 2.2µ H inductor. Select an inducto r with a DC resistance less than 50mΩ to optimize efficiency. High-frequency, switch-mode power suppl ies with a magnetic device have strong electronic magnetic inference for the system . Any unshielded power inductor should be avoided since it has poor magnetic shielding. Metal alloy or multiplayer chip power shield inductors are recommended for application s since they can decrease influence effectively. Table 2 lists some recommended inductors. Table 2: Suggested Inductor List Manufacturer P/N Inductance (μH ) Manufacturer VLS252010HBX-R47M 0.47 TDK 1239AS-H-1R0M 1.0 Tokyo 74438322010 1.0 Wurth For most designs, estimate the inductance value from Equation (2): OUT IN OUT IN L OSC V (V V )L V I f Where ∆IL is the inductor ripple current. Choose the inductor cur rent to be approximately 30% of the maximum load current. The maximum inductor peak current can be calculated with Equation (3): L L(MAX) LOAD III 2 (3) Selecting the Input Capacitor The input current to the step -down converter is discontinuous and th erefore requires a capacitor to supply AC current to the step -down converter while maintaining the 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 and small temperature coefficients. For most applications, a 22µ F capacitor is sufficient. Higher output voltages may require more capacitors to increase system stability. The input capacitor requires a n adequate ripple current rating because it absor bs the input switching current. Estimate the RMS current in the input capacitor with Equation (4): OUT OUT C1 LOAD IN IN VVI I 1 VV (4) The worst-case scenario occurs at VIN = 2VOUT, shown in Equation (5): LOAD II 2 (5) For simplification, choose a n input capacitor with an 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, add a small , high-quality, 0.1μF, ceramic capacitor as close to the IC as possible. When using ceramic capacitors, ensure that they have enough capacitance to provide a sufficient charge to prevent excessive voltage ripple at the input. The input voltage ripple caused by the capacitance can be estimated with Equation (6): LOAD OUT OUT IN INS IN I V VV1 f C1 V V Selecting the Output Capacitor The output capacitor (C2) stabilizes the DC output voltage. Ceramic , low ESR capacitors are recommended for limiting the output voltage ripple. Estimate the output voltage ripple with Equation (7): 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 RESR is the equivalent series resistance (ESR) value of the output capacitor. When using ceramic capacitors, the capacitance dominates the impedance at the switching freque ncy and causes most of the output voltage ripple.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL MP2141Q Rev. 1.0 www.MonolithicPower.com 21 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL APPLICATION CIRCUIT MP2141Q-18 or MP2141Q-06 GND VSEL VIN 10μF EN VIN VOUT 1.8V/1.5A or 0.61V/1.5ASW 22μF EN OUT 0.47μH PFM PWM kΩ100 Figure 11: Typical Application Circuit NOTE: VIN < 3.3V may need more input capacitors.
MP2141Q – 1.5A SYNCHRONOUS STEP-DOWN SWITCHER WITH VSEL 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 Prop erty rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP2141Q Rev. 1.0 www.MonolithicPower.com 22 2/6/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
PACKAGE INFORMATION
PACKAGE OUTLINE DRAWING FOR 6L SOT563 MF-PO-D-0250 revision 1.0 FRONT VIEW NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING IS NOT TO SCALE. TOP VIEW BOTTOM VIEW RECOMMENDED LAND PATTERN SIDE VIEW PIN 1 ID