MP2117 MPS | Alldatasheet

Document overview

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Technical content

1.25MHz, 2.2A Synchronous Step-Down Switcher END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 1 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved.

DESCRIPTION

The MP2117 is an internally compensated 2.2A synchronous step-down switcher. The operating frequency is internally set at 1.25MHz. MP2117 is ideal for powering portable equipment that runs from a single cell Lithium -Ion (Li+) Battery. The MP2117 can provide up to 2.2A continuous load current from a 2.5V to 6V input voltage. The output voltage can be regulated as low as 0.6V. 100% duty cycle provides low dropout operation that extends operating time in battery- operated systems. The MP2117 feature s an integrated high -side switch and synchronous rectifier for high efficiency. With peak current mode control and internal compensation, the MP2117 can be stabilized with ceramic capacitors and small inductors. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. MP2117 is available in the small 10 -pin 3mmx3mm QFN and SOIC-8 packages.

FEATURES

  • 2.2A Output Current
  • 2.5V to 6V Input Range VIN
  • Internal Power MOSFET Switches
  • Low Dropout Operation: 100% Duty Cycle
  • Up to 90% Efficiency
  • Stable with Ceramic Output Capacitors
  • 1μA Shutdown Current
  • 1.25MHz Switching Frequency
  • Thermal Shutdown
  • Cycle-by-Cycle Over Current Protection
  • Output Short Circuit Protection
  • Internal Soft-start
  • Power On Reset Output
  • Available in 10 -Pin QFN (3 mmx3mm) and 8-pin SOIC Packages

APPLICATIONS

  • DVD+/-RW Drives
  • LCD TV
  • PDAs
  • Portable Instruments “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 2 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved.

ORDERING INFORMATION

*For Tape & Reel, add suffix –Z (eg. MP2117DQ–Z): For RoHS compliant packaging, add suffix –LF (eg. MP2117DQ–LF–Z). CONTACT FACTORY **For Tape & Reel, add suffix –Z (eg. MP2117DN–Z): For RoHS compliant packaging, add suffix –LF (eg. MP2117DN–LF–Z). CONTACT FACTORY PACKAGE REFERENCE QFN10 (3mmx3mm) SOIC8E ABSOLUTE MAXIMUM RATINGS (1) VSW<+8.5V, Transient <50ns) Continuous Power Dissipation (TA = +25°C) (2) Recommended Operating Conditions (3) 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 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 JESD5 1-7, 4-layer PCB. Part Number* Package Top Marking Temperature MP2117DQ QFN10 (3mmx3mm) S4 –40C to +85C Part Number** Package Top Marking Temperature MP2117DN SOIC8E MP2117DN –40C to +85C

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 3 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (5) VIN = VEN = 3.6V, TA = +25C, unless otherwise noted. Parameters Condition Min Typ Max Units No Load Supply Current VIN = 3.6V, VEN=3.6V VFB = 0.65V 350 500 μA Shutdown Current VEN = 0V, VIN = 6V 0.01 1 μA Thermal Shutdown Trip Threshold Hysteresis = 20°C 150 °C PWROK Upper Trip Threshold FB with respect to the Nominal Value 10 % PWROK Lower Trip Threshold FB with respect to the Nominal Value –10 % PWROK Output Lower Voltage ISINK = 5mA 0.3 V PWROK Deglitch Timer 50 μs EN Trip Threshold –40°C ≤ TA ≤ +85°C 0.3 1.5 V EN Pull Down Resistor 1 MΩ IN Under Voltage Lockout Threshold Rising Edge, Hysteresis=0.3V 1.8 2.2 V FB Input Bias Current VFB = 0.62V –50 +50 nA SW PFET On Resistance ISW = 100mA 0.20 Ω SW NFET On Resistance ISW = –100mA 0.15 Ω SW Leakage Current VEN = 0V, VIN = 6V VSW = 0V or 6V –5 +5 μA SW PFET Peak Current Limit Duty Cycle = 100%, Current Pulse Width < 1ms 2.5 3.3 4.5 A Oscillator Frequency 1.00 1.25 1.50 MHz Notes: 5) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization. PIN FUNCTIONS QFN Pin # SOIC Pin # Name Description 1 1 FB Feedback Input for the switcher output VOUT. 2 8 EN Enable Input for the switcher. 3 2 IN Input Supply Pin. 4, 5 3 SW Switcher switch node. 6 4, 5 PGND Low Side Synchronous Rectifier Switch Power Ground. 7 6 GND Chip Analog Ground. Connect the Exposed Pad to GND. 9 7 PWROK Power On Reset Open Drain Output. HIGH output indicates that the output is within 10% of the regulation value. LOW o utput indicates that the output is out of 10% window. PWROK is pulled down in shutdown. The PWROK window comparators have 50us deglitch timer to avoid false trigger during load transient. 8, 10 - N/C No Connection.

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 4 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 5V, VOUT = 1.8V, L=1.2uH, TA = +25ºC, unless otherwise noted.

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 5 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT = 1.8V, L=1.2uH, TA = +25ºC, unless otherwise noted.

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 6 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT = 1.8V, L=1.2uH, TA = +25ºC, unless otherwise noted.

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 7 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. OPERATION Figure 1—Functional Block Diagram The MP2117 is a 1.25MHz fixed frequency current mode synchronous step -down switcher. The MP2117 is optimized for low voltage, Li -Ion battery powered appli cations where high efficiency and small size are critical. The MP2117 can provide up to 2.2A continuous load current from a 2.5V to 6V input voltage. The MP2117 uses an external resistor divider to set the switcher output voltage from 0.6V to 6V. 2.2A Step-Down Switcher The switcher integrates both a main switch and a synchronous rectifier, which provides high efficiency and eliminates an external Schottky diode. The duty cycle D of a step -down switcher is defined as: OUT ON OSC IN Where TON is the main switch on time and fOSC is the oscillator frequency (1.25MHz). Current Mode PWM Control Slope compensated current mode PWM control provides stable switching and cycle -by-cycle current limiting for superior load and line response in addition to p rotection of the internal main switch and synchronous rectifier. The MP2117 switches at a constant frequency (1.25MHz) and regulates the output voltage. During each cycle the PWM comparator

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 8 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. modulates the power transferred to the load by changing the induc tor peak current based on the feedback error voltage. During normal operation, the main switch is turned on for a certain time to ramp the inductor current at each rising edge of the internal oscillator, and switched off when the peak inductor current is a bove the error voltage. When the main switch is off, the synchronous rectifier will be turned on immediately and stay on until the next cycle starts. Dropout Operation The MP2117 allows the main switch to remain on for more than one switching cycle and inc reases the duty cycle while the input voltage is dropping close to the output voltage. When the duty cycle reaches 100%, the main switch is held on continuously to deliver current to the output up to the PFET current limit. The output voltage then becomes the input voltage minus the voltage drop across the main switch and the inductor. Short Circuit Protection When the output is shorted to ground, the oscillator frequency is reduced to prevent the inductor current from increasing beyond the PFET current limit. The PFET current limit is also reduced to lower the short circuit current. The frequency and current limit will return to the normal values once the short circuit condition is removed and the feedback voltage reaches 0.6V. Maximum Load Current The MP 2117 can operate down to 2.5V input voltage; however the maximum load current decreases at lower input due to a large IR drop on the main switch and synchronous rectifier. The slope compensation signal reduces the peak inductor current as a function of the duty cycle to prevent sub -harmonic oscillations at duty cycles greater than 50%. Conversely, the current limit increases as the duty cycle decreases. Power OK The MP2117 provides an open -drain PWROK output that goes high after the output reaches regulation during startup. PWROK goes low after the output goes out of regulation by ±10% or when device enters shutdown. There is 50 µsec deglitch timer built in to avoid PWROK false triggered during load transient. Enable Control MP2117 has a dedicated Enable c ontrol pin. By pulling it to high or low, the IC can be enabled and disabled by EN. Tie EN to VIN by proper voltage divider for automatic start up as Figure 2 shows. And make sure that: EN2 IN EN1 EN2 RMax. EN Threshold<V 6V(R R ) + Figure 2

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 9 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved.

APPLICATION INFORMATION

The external resistor divider sets the output voltage. It is optional to speed loop response by adding a small feedforward capacitor C F parallel with R1. Choose R1*C F time constant around 3usec. Choose R2 value between 1kΩ and 100kΩ. R1 is then given by: OUTVR1= R2 ( -1)0.6V Table 1—Resistor Selection vs. Output Voltage Setting VOUT R1 R2 1.2V 60.4kΩ 60.4kΩ 1.5V 90.9kΩ 60.4kΩ 1.8V 121kΩ 60.4kΩ 2.5V 191kΩ 60.4kΩ) 3.3V 274KΩ 60.4kΩ Inductor Selection A 1μH to 10μH inductor with DC cur rent rating at least 25% higher than the maximum load current is recommended for most applications. For best efficiency, the inductor DC resistance should be <100mΩ. See Table 2 for recommended inductors and manufacturers. For most designs, the inductance value can be derived from the following equation: ( ) OSCLIN OUTINOUT fIV VVVL  −= Where ΔIL is inductor ripple current. Choose inductor ripple current approximately 30% of the maximum load current, 2.2A. The maximum inductor peak current is: L L(MAX) LOAD(MAX) ΔII = I 2+ Table 2—Suggested Surface Mount Inductors Manufacturer Part Number Inductance (μH) Max DCR (mΩ) Saturation Current (A) Wurth 7447745012 1.2 17 4.6 Toko D62LCB-#A918CY-1R0M 1.0 17 3.7 Switcher Input Capacitor CIN1 Selection The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency should be less than input source impedance to prevent high frequency switching current passing to the input. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coeffi cients. For most applications, a 10μF~22μF capacitor is sufficient. Switcher Output Capacitor COUT1 Selection The output capacitor keeps output voltage ripple small and ensures regulation loop stable. The output capacitor impedance should be low at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended. For most applications, a 22μF~47μF capacitor is sufficient. The output ripple ΔVOUT is approximately: OUT IN OUT OUT IN OSC OSC OUT V (V - V ) 1ΔV ESR V f L 8 f C

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 10 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. Thermal Dissipation Power dissipation should be considered when MP2117 provide maximum 2.2A output current to the loads at high ambient temperature. If the junction temperature rises above 150 C, the MP2117 will be shut down. The junction-to-ambient thermal resistance of the 10-pin QFN or 8 -pin SOIC RΘJA is 50 C/W. The maximum power dissipation is about 1.6W when the MP2117 is operating in a 70 C ambient temperature environment. W6.1 W/C50 C70C150PD o oo MAX =−= PCB Layout The high current paths (GND, IN, OUT and SW) should be placed very close to the device w ith short, direct and wide traces. Input capacitors should be placed as close as possible to the respective IN and PGND pins. The external feedback resistors should be placed next to the FB pins. Keep the switching nodes SW short and away from the feedback network. An external diode (i.e. B130) can be added between SW and GND to reduce switching noise and to improve the load regulation. The reference layout and its schematic are shown below: Top Layer Bottom Layer Figure 3

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 MP2117 Rev. 0.92 www.MonolithicPower.com 11 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved.

PACKAGE INFORMATION

QFN10 (3X3)

MP2117 – 1.25MHZ, 2.2A SYNCHRONROUS STEP-DOWN SWITCHER END OF LIFE, REFER TO MP1605 Notice: The information in this document is subject to change without notice. Please contact MPS for current sp ecifications. 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. MP2117 Rev. 0.92 www.MonolithicPower.com 12 6/20/2022 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. SOIC8E