MP3414DJ-LF-P

MP3414 1.8A,1MHz, Synchronous, Step-up Converter with Output Disconnect The Future of Analog IC Technology FEATURES DESCRIPTION          The MP3414 is a high-efficiency, synchronous, current–mode, step-up converter with output disconnect. The MP3414 can start up from an input voltage as low as 0.8V to provide inrush current limiting, and output short-circuit protection. The integrated, P-channel, synchronous rectifier improves efficiency and eliminates the need for an external Schottky diode. The PMOS disconnects the output from the input when the part shuts down. This output disconnect feature allows the output to be completely discharged, thus allowing the part to draw a 1μA supply current in shutdown mode.      The 1MHz switching frequency allows for smaller external components, while the internal compensation and the soft-start minimize the external component count: these feature help to produce a compact solution for a wide current load range.    Up to 96% Efficiency 0.8V Low Voltage Start-Up 0.6V-to-4V Input Range 1.8V-to-4V Output Range Internal Synchronous Rectifier 1MHz Fixed-Frequency Switching 35μA Quiescent Current 1μA Shutdown Current Current-Mode Control with Internal Compensation True Output Disconnect from Input VIN>VOUT Down Mode Operation High Efficiency under Light-Load Conditions Very Small External Components Inrush Current Limiting and Internal SoftStart Over-Voltage Protection Short-Circuit Protection TSOT23-8 Package APPLICATIONS      The MP3414 features an integrated power MOSFET that supports up to a 4V output and a typical 1.8A peak switching current. The MP3414 is available in a small 8-pin TSOT23 package. Battery-Powered Products Personal Medical Devices Portable Media Players Wireless Peripherals Handheld Computers and Smartphones All MPS parts are lead-free, halogen 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 L 3.3µH 100 90 3 1 VIN CIN 10µF ON OFF SW IN OUT MP3414 8 EN PGND AGND 4 MP3414 Rev 1.05 3/30/2018 6 2 R1 365k FB 7 VOUT COUT 47µF 80 70 60 50 40 R2 210k 30 20 10 0 0.01 0.1 1 10 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 100 1000 1 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT ORDERING INFORMATION Part Number* MP3414DJ Package TSOT23-8 Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP3414DJ–Z); For RoHS-compliant packaging, add suffix –LF (e.g. MP3414DJ–LF–Z) TOP MARKING ACM: product code of MP3414DJ Y: year code PACKAGE REFERENCE TOP VIEW TSOT23-8 MP3414 Rev 1.05 3/30/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 2 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT ABSOLUTE MAXIMUM RATINGS (1) SW Pin, OUT Pin ........................-0.5V to +6.5V All other Pins ...................................-0.5V to +6V Continuous Power Dissipation (TA = 25°C) (2) ................................................................. 1.25W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature .............. –65°C to +150°C Recommended Operating Conditions (3) Start-up Voltage VST........................... 0.8V to 4V Supply Voltage VIN ............................. 0.6V to 4V VOUT .................................................... 1.8V to 4V Operating Junction Temp. (TJ). -40°C to +125°C MP3414 Rev 1.05 3/30/2018 Thermal Resistance (4) θJA θJC TSOT23-8 .............................. 100 ..... 55... °C/W 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-toambient 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 is not guaranteed to function outside of its operation conditions. 4) Measured on JESD51-7 4-layer board. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 3 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT ELECTRICAL CHARACTERISTICS VIN = VEN = 1.8V, VOUT = 3.3V, TA = 25°C, unless otherwise noted. Parameters Minimum Startup Voltage Operating Input Voltage Output Voltage Adjust Range Symbol VST VIN VOUT Quiescent Current Shutdown Current IN Under-Voltage Lockout Operation Frequency Feedback Voltage Feedback Input Current NMOS On-Resistance NMOS Leakage Current PMOS On-Resistance PMOS Leakage Current Maximum Duty Cycle Startup Current Limit NMOS Current Limit IQNS ISD VUVLO fSW VFB IFB RNDS ON IN LK RPDS ON IP LK DMAX IST LIMIT ISW LIMIT EN Input High Level VEN_H EN Input Low Level VEN_L EN Input Current Thermal Shutdown(5) Over Temperature Hysteresis(5) IEN Condition Min Typ 0.8 Max 1.0 4 4.0 Units V V V 35 50 µA 1 0.5 1.0 1.21 1 110 0.1 120 0.1 95 0.75 1.8 3 0.6 1.2 1.23 50 µA V MHz V nA mΩ µA mΩ µA % A A 0.6 1.8 VEN=VIN=1.8V, VOUT=3.3V, no load, Measured on OUT pin VEN=VOUT=0V, Measured on IN pin VIN Rising 0.4 0.8 1.19 VFB=1.25V VSW=6.5V VSW=6.5V, VOUT=0V 89 1.5 0.8× VIN 1 1 V 0.2× VIN Connect to VIN 10 150 20 V nA °C °C Notes: 5）Guaranteed by design, not tested MP3414 Rev 1.05 3/30/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 4 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT TYPICAL PERFORMANCE CHARACTERISTICS Performance waveforms are tested on the evaluation board in the Design Example section. VIN = 1.8V, VOUT = 3.3V, L = 3.3µH, TA = 25°C, unless otherwise noted. MP3414 Rev 1.05 3/30/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 5 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT TYPICAL PERFORMANCE CHARACTERISTICS (continued) Performance waveforms are tested on the evaluation board in the Design Example section. VIN = 1.8V, VOUT = 3.3V, L = 3.3µH, TA = 25°C, unless otherwise noted. MP3414 Rev 1.05 3/30/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 6 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT PIN FUNCTIONS Pin # Name 1 IN 2 OUT 3 4 SW PGND 5 NC No Connection. 6 AGND Analog Ground. 7 FB Feedback. Connect to the tap of an external resistive voltage divider from the output to FB to set the output voltage. 8 EN Enable input. Turns regulator on or off. Logic high (>0.8VIN) turns on the regulator. It is internally pulled up to IN Pin through 1.5MΩ resistor. MP3414 Rev 1.05 3/30/2018 Pin Function Input Supply. Requires bypass capacitor. Output Node. Source of the internal synchronous rectifier. Place the output capacitor as close as possible between OUT and PGND. Output Switch Node. Connect the inductor to SW to complete the step-up converter. Power Ground. Reference ground of the regulated output voltage. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 7 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT BLOCK DIAGRAM SW IN EN Bias and Voltage Ref Enable VIN VBETTER Body Control OVP VDD OUT HS + - Thermal Control FB Zero current Cross COMP Driver and Control logic Start-up Mode Control LS PGND Oscillator - AGND + PWM COMP + - Σ EA Clamp PGND + + - Slope COMP Current Sense Amplifier Soft Start FB OUT 1.21V Figure 1: Functional Block Diagram MP3414 Rev 1.05 3/30/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 8 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT OPERATION The MP3414 is a 1MHz, synchronous, step-up converter housed in a compact TSOT23 package with true output disconnect. Able to operate at low-input voltages of less than 0.8V, the device features fixed-frequency currentmode PWM control for exceptional line and load regulation. Internal soft-start and loop compensation simplify the design process and minimize the external components. The internal low-RDS(ON) MOSFETs combined with Power Save Mode operation enable the device to maintain high efficiency over a wide currentload range. Synchronous Rectifier The MP3414 integrates an N-channel and a Pchannel MOSFET to realize a synchronous rectifier. Replacing the traditional Schottky diode with a low-RDS(ON) PMOS improves efficiency. In a conventional synchronous rectifier, the PMOS body diode is forwardbiased, and the current flows from VIN to VOUT. The MP3414 allows for true output disconnect by eliminating the body diode, and prevents battery depletion when the converter shuts down. To prevent excessive inductor current, the PMOS synchronous rectifier only functions when VOUT > (VIN +200mV). Start-Up When EN is on, the MP3414 starts up with a linear charge period. During this linear charge period, the rectifier PMOS turns on until the output capacitor charges to VIN–200mV; the PMOS current is limited during this period to around 750mA to avoid inrush current. This circuit also helps to limit the output current under short circuit conditions. After the linear charging period, the device starts switching. If VOUT remains below 1.7V, the part then works in free-running mode; in this mode, the device works in open loop at a fixed 500kHz switching frequency, the duty cycle depends on the input-output ratio, and the switching current is limited to 1.2A to avoid the start-up current inrush. The internal soft-start (SS) does not take MP3414 Rev 1.05 3/30/2018 charge and continues to rise following the FB voltage during the linear charging and freerunning period. Once the output voltage reaches 1.7V, the normal closed-loop operation initiates, VOUT starts to rise under the control of SS, and the current limit goes to 1.8A. It then works either in boost mode or down mode depending on VIN and VOUT. Table 1 lists the operation modes during start up. Table 1: Operation Mode during Start-Up Sequence VOUT VOUT) Operation The MP3414 will continue to regulate the output voltage even when the input voltage exceeds the output voltage. This is achieved by terminating the switching at the synchronous PMOS and applying VIN statically on its gate. This ensures that the slope of the inductor current will reverse while current flows to the output. Since the PMOS no longer acts as a low-impedance switch in this mode, power dissipation increases within the IC to cause a sharp drop in efficiency. Limit the maximum output current to maintain an acceptable junction temperature. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 10 MP3414 – 1.8A, 1MHZ, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT APPLICATION INFORMATION COMPONENT SELECTION Input Capacitor Selection Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. It follows that ceramic capacitors are also a good choice for input decoupling and should be located as close as possible to the device. Add a ceramic capacitor larger than 10μF in parallel with a 100nF ceramic capacitor close to the IC. Output Capacitor Selection The output capacitor requires a minimum capacitance value of 22μF at the programmed output voltage to ensure stability over the full operating range. A higher capacitance value may be required to lower the output ripple and also the transient response. Low ESR capacitors, such as X5R- or X7R-type ceramic capacitors, are recommended. Assuming that the ESR is zero, estimate the minimum output capacitance to support the ripple in the PWM mode as. CO  IO  (VOUT(MAX)  VIN(MIN) ) fS  V OUT(MAX) ∆V (2) Where, VOUT(MAX) = Maximum output voltage VIN(MIN) = Minimum Input voltage IO=Output current fS = Switching frequency ∆V= Acceptable output ripple Additional output capacitance may also be required for applications where VIN≈VOUT to reduce ripple in PSM mode and to ensure stability in PWM mode, especially at higher output load currents. MP3414 Rev 1.05 3/30/2018 Inductor Selection The MP3414 can use small surface-mount inductors due to its 1MHz switching frequency. Inductor values between 1.5μH and 4.7μH are suitable for most applications. Larger values of inductance will allow slightly greater output current capability (and lower the PSM threshold) by reducing the inductor ripple current. Increasing the inductance above 6.8μH will increase component size while providing little improvement in output current capability. The minimum inductance value is given by: L VIN(MIN)  (VOUT(MAX)  VIN(MIN) ) 2  V OUT(MAX) ∆IL  fS (3) Where ∆IL is the acceptable inductor current ripple The inductor current ripple is typically set at 30% to 40% of the maximum inductor current. High-frequency ferrite-core inductor materials reduce frequency-dependent power losses and improve efficiency compared to cheaper powdered-iron cores. The inductor should have low DCR (inductor series resistance without saturated windings) to reduce the resistive power loss; further reducing the DCR will significantly improve efficiency when DCR