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MPQ2459 0.5A, 55V, 480KHz, Step-Down Converter in a TSOT23-6 Package AEC-Q100 Qualified MPQ2459 Rev. 1.11 www.MonolithicPower.com 1 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. The Future of Analog IC Technology
DESCRIPTION
The MPQ2459 is a monolithic, step-down, switch-mode converter with a built-in power MOSFET. It achieves a 0.5A peak output current over a wide input-supply range with excellent load and line regulation. Current mode operation provides a fast transient response and eases loop stabilization. Fault protections include cycle-by-cycle current limiting and thermal shutdown. The MPQ2459 requires a minimal number of readily-available, standard, external components. The MPQ2459 is available in a TSOT23-6 package.
FEATURES
Guaranteed Industrial/Automotive Temp Range Limits. 0.5A Peak Output Current 1 Ω Internal Power MOSFET Stable with Low-ESR Ceramic Output Capacitors Up to 90% Efficiency 0.1 μA Shutdown Mode Fixed 480kHz Frequency Thermal Shutdown Cycle-by-Cycle Over-Current Protection Wide 4.5V-to-55V Input Operating Range Output Adjustable from 0.81V to 0.95×VIN Available in a TSOT23-6 Package Available in AEC-Q100 Grade 1
APPLICATIONS
Power Meters Distributed Power Systems Battery Chargers Pre-Regulators for Linear Regulators WLED Drivers All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION 100
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 2 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number Package Top Marking MPQ2459GJ* TSOT23-6 AEQ MPQ2459GJ-AEC1** TSOT23-6 AEQ * For Tape & Reel, add suffix –Z (eg. MPQ2459GJ–Z); ** For Tape & Reel, add suffix -Z (e.g. MPQ2459GJ-AEC1-Z). PACKAGE REFERENCE BST GND FB SW IN EN TOP VIEW ABSOLUTE MAXIMUM RATINGS (1) Continuous Power Dissipation (TA = +25°C) (2) Recommended Operating Conditions (3) Thermal Resistance (4) θJA θJC Notes: 1) Absolute maximum are rated under room temperature unless otherwise noted. 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 θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by 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. 3) The device function is not guaranteed outside of the recommended operating conditions. 4) Measured on JESD51-7, 4-layer PCB.
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 3 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = 12V, TJ = −40°C to +125°C, unless otherwise noted. Typical values are at TJ=25°C. Parameters Symbol Condition Min Typ Max Units Feedback Voltage V FB 0.796 0.812 0.828 V TJ=25°C 0.800 0.812 0.824 V Feedback Current I FB V FB = 0.85V 0.1 μA Switch-ON Resistance R DS(ON) 1 2 Ω Switch Leakage I SW LKG V EN = 0V, VSW = 0V 1 μA Oscillator Frequency f SW V FB = 0.6V 360 480 600 kHz Foldback Frequency f SW F V FB = 0V 150 kHz Maximum Duty Cycle D MAX V FB = 0.6V 90 93.5 % Minimum ON Time (5) τON 100 ns Under-Voltage-Lockout Threshold, Rising V UVLO R 2.9 3.3 3.7 V Under-Voltage-Lockout Threshold, Falling V UVLO F 2.65 3.05 3.45 V Under-Voltage-Lockout Threshold, Hysteresis VUVLO_HYS 250 mV EN Threshold Rising V EN R 1.1 1.35 1.6 V EN Threshold Falling V EN F 0.9 1.17 1.3 V EN Input Hysteresis V EN HYS 180 mV EN Input Current I EN VEN = 2V 3.1 5 μA VEN = 0V 0.1 1 Supply Current, Shutdown I S V EN = 0V 0.1 1.0 μA Supply Current, Quiescent I Q VEN = 2V, VFB = 1V 0.73 0.92 mA Thermal Shutdown (5) T SD 165 °C Thermal Shutdown Hysteresis(5) T SD HYS 20 °C Notes: 5) Guaranteed by design.
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 4 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL CHARACTERISTICS VIN=12V, VOUT=5V, IOUT=0.5A, L=15μH, TA=25°C, unless otherwise noted. -80 -60 -40 -20 100 1000 10000 100000 1000000 -180 -120 -60 120 180 -80 -60 -40 -20 100 1000 10000 100000 1000000 -180 -120 -60 120 180 0.3 0.5 0.7 0.9 1.1 1.3 5 1 52 53 54 55 56 5 Radiation EMIConduction EMI 150k 300 8001M 2M 3M 5M 810M 20M 30M EN 55022 Voltage on Mains QP EN 55022 Voltage on Mains AV 0 5 20 25 30 35 40 45 30M 5060 80100M 200 300 400500 800 1G EN 55022 Electric Field Strength 3 m QP
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 5 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN=12V, VOUT=5V, L=22μH, TA=25°C, unless otherwise noted. 750 770 790 810 830 850 400 440 480 520 560 600 -2.0 -1.6 -1.2 -0.8 -0.4 0.0 0.4 0.8 1.2 1.6 2.0 6 1 62 63 64 65 6 -2.0 -1.6 -1.2 -0.8 -0.4 0.0 0.4 0.8 1.2 1.6 2.0 100 LOAD CURRENT ( A ) LOAD CURRENT ( A ) -2.0 -1.6 -1.2 -0.8 -0.4 0.0 0.4 0.8 1.2 1.6 2.0 6 1 62 63 64 65 6 INPUT VOLTAG ( V ) INPUT VOLTAG ( V ) LINE REGULATION ( % ) -2.0 -1.6 -1.2 -0.8 -0.4 0.0 0.4 0.8 1.2 1.6 2.0 100 LOAD CURRENT ( A ) LOAD CURRENT ( A ) Load Regulation Line Regulation IOUT=0.5A Load Regulation VOUT=3.3V Efficiency vs. Load 0.5 0.8 1.1 1.4 1.7 2.0 -40 -10 20 50 80 110 140 -40 -10 20 50 80 110 140 -40 -10 20 50 80 110 140
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 6 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN=12V, VOUT=5V, L=22μH, TA=25°C, unless otherwise noted. Steady State VIN=8V, IOUT=0.8A Steady State IOUT=0.15A Load Transient IOUT=0.2A to 0.7A Steady State VIN=6V, VOUT=3.3V, IOUT=0.1A Steady State VIN=60V, VOUT=3.3V, IOUT=0.9A VIN 10V/div. VSW 10V/div. VOUT 200mV/div. IL 500mA/div. VIN 50V/div. VSW 50V/div. VOUT 2V/div. IL 1A/div. VIN 5V/div. VSW 5V/div. VOUT 2V/div. IL 200mA/div. VIN 5V/div. VSW 5V/div. VOUT 5V/div. IL 500mA/div. VIN 10V/div. VSW 10V/div. VOUT 5V/div. IL 1A/div. VIN 10V/div. VSW 10V/div. VOUT 200mV/div. IL 500mA/div. Load Transient VOUT=3.3V, IOUT=0.2A to 0.7A Power Ramp Up VIN=60V, IOUT=0.5A Power Ramp Down VIN=60V, IOUT=0.5A Short Output IOUT=0.65A VIN 50V/div. VSW 50V/div. VOUT 5V/div. IOUT 500mA/div. VIN 50V/div. VSW 50V/div. VOUT 5V/div. VOUT 5V/div. IOUT 500mA/div. VIN 10V/div. VSW 10V/div. IL 1A/div.
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 7 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN=12V, VOUT=5V, L=22μH, TA=25°C, unless otherwise noted. Enable On IOUT=0.5A Enable Off IOUT=0.5A Short Output Recovery IOUT=0.65A VOUT 5V/div. VEN 2V/div. VSW 10V/div. IL 500mA/div. VOUT 5V/div. VEN 2V/div. VSW 10V/div. IL 500mA/div. VOUT 5V/div. VIN 10V/div. VSW 10V/div. IL 1A/div.
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 8 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 BST Bootstrap. Connect a capacitor between SW and BST to form a floating supply across the power-switch driver. This capacitor drives the power switch’s gate above the supply voltage.
2 GND
Ground. Voltage reference for the regulated, output voltage. Requires special layout considerations. Place this node outside of t he D1-to-C1 ground path to prevent current- switching spikes from introducing voltage noise. 3 FB Feedback. Sets the output voltage through an exter nal resistor divider from the output to GND. To prevent current-limit runaway during a short- circuit fault, the frequency foldback comparator lowers the oscillator frequency when VFB is below 250mV. 4 EN ON/OFF Control. Pull EN above 1.2V to turn the device ON. For automatic enable, connect a 100kΩ resistor between this pin and IN. 5 IN Supply Voltage. The MPQ2459 operates from a 4. 5V-to-55V unregulated input. Requires C1 to prevent large voltage spikes from appearing at the input. 6 SW Switch Output.
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 9 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. OPERATION The MPQ2459 is a current-mode buck regulator — the EA output voltage is proportional to the peak-inductor current. At the beginning of a cycle, M1 is OFF. The EA output voltage exceeds the current-sense- amplifier output, and the current comparator’s output is LOW. The rising edge of the 480kHz CLK signal sets the RS flip-flop. The flip-flip’s output turns on M1 to connect the SW pin and inductor to the input supply. The current-sense amplifier senses and amplifies the rising inductor current. The PWM comparator takes the sum of the current-sense amplifier’s output and the ramp compensator and the error amplifier output as its inputs. When the sum of the current sense amplifier’s output and the ramp-compensation signal exceeds the EA output voltage, the RS flip-flop resets and M1 turns OFF. The external Schottky rectifier diode (D1) conducts the inductor current. If the sum of the current sense amplifier’s output and the slope compensation signal does not exceed the EA output for a whole cycle, then the falling edge of the CLK resets the flip- flop. The EA output integrates the voltage difference between the feedback and the 0.81V bandgap reference. When V FB<0.81V, the EA output voltage increases. Since the EA output voltage is proportional to the peak inductor current, an increase in its voltage also increases current delivered to the output. Enable Control The MPQ2459 has a dedicated enable contro pin EN. With high enough VIN, the chip can be enabled and disabled by EN pin. Internally a zener diode is connected from EN pin to GND pin. The typical clamping voltage of the zener diode is 7.5V. So VIN can be connected to EN though a high ohm resistor, if the system doesn't have another logic input acting as enable signal. The resistor needs to be designed to limit the EN pin sink current less than 100μA. Figure 1: Functional Block Diagram
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 10 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
APPLICATION INFORMATION
Setting the Output Voltage The external resistor divider sets the output voltage (see Typical Application). Table 1 lists a selection of resistor combinations for common output voltages. The feedback resistor (R2) also sets the feedback loop bandwidth with the internal compensation capacitor (see Figure 1). R1 is then: OUT R2R1 V 10.812V Table 1: Resistor Selection for Common Output Voltages VOUT (V) R1 (k Ω) R2 (k Ω) Inductor Selection Use an inductor with a DC-current rating at least 25% percent higher than the maximum load current for most applications. Select an inductor with a DC resistance <200m Ω for highest efficiency. Most designs can use the inductance value calculated from the following equation: SWLIN OUTINOUT fIV )VV(VL Where ∆IL is the inductor ripple current. Choose the inductor ripple current at 30% of the maximum load current. The maximum inductor peak current is then: III L LOAD)MAX(L Under light-load conditions (<100mA), use a larger inductor to improve efficiency. Input Capacitor Selection The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. The input-capacitor impedance at the switching frequency should be less than the input-source impedance to prevent high-frequency-switching current from passing through the input. Use ceramic capacitors with X5R or X7R dielectrics because of their low ESR and small temperature coefficients. For most applications, a 4.7µF capacitor is sufficient. Output Capacitor Selection The output capacitor keeps the output voltage ripple small and ensures feedback loop stability. The output capacitor impedance should be low at the switching frequency. Use ceramic capacitors with X5R or X7R dielectrics for their low ESR characteristics. For most applications, a 22µF ceramic capacitor is sufficient. PCB Layout Guide PCB layout is very important to achieve stable operation. Please follow these guidelines and use Figure 2 as reference. 1) Keep the switching-current path short and minimize the loop area formed by input capacitor, high-side MOSFET, and Schottky diode. 2) Keep the connection from the Schottky diode to the SW pin and the input power ground as short and wide as possible. 3) Ensure all feedback connections are short and direct. Place the feedback resistors and compensation components as close to the chip as possible. 4) Route SW away from sensitive analog areas such as the FB path. 5) Connect IN, SW, and GND to large copper areas to cool the chip to improve thermal performance and long-term reliability. For single layer PCB, avoid soldering the exposed pad.
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED MPQ2459 Rev. 1.11 www.MonolithicPower.com 12 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. TYPICAL APPLICATION CIRCUIT VIN IN5 100k 26.1k 40.2k 100nF DFLS160 124k NS NS FB1 0805 NS 3.3V/0.5A GND GND FB SW BST EN EN VOUT GND MPQ2459 Figure 4: Typical Application Circuit with EMI Concern
MPQ2459 –INDUSTRIAL GRADE, 55V, 480KHz, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED NOTICE: The information in this document is subject to change wi thout notice. Users should warra nt and guarantee that third party Intellectual Property rights are not infringed upon w hen integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MPQ2459 Rev. 1.11 www.MonolithicPower.com 13 1/4/2018 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved.
PACKAGE INFORMATION
0.30 0.50 SEATING PLANE
0.95 BSC
0.84 0.90 1.00 MAX 0.00 0.10 TOP VIEW FRONT VIEW SIDE VIEW RECOMMENDED LAND PATTERN 2.80 3.00 1.50 1.70 2.60 3.00 0.09 0.20 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 CONFORMS TO JEDEC MO -193, VARIATION AB . 6) DRAWING IS NOT TO SCALE . 7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK FROM LEFT TO RIGHT , (SEE EXAMPLE TOP MARK) 0.30 0.500o-8o
0.25 BSC
2.60 TYP 1.20 TYP 0.95 BSC 0.60 TYP SEE DETAIL "A" AAAAPIN 1 See Note 7 EXAMPLE TOP MARK