MIC2619YD6-TR

MIC2619 1.2 MHz PWM Boost Converter with OVP Features General Description • • • • • • • • • • • • The MIC2619 is a 1.2 MHz pulse width modulated (PWM) step-up switching regulator that is optimized for low power, high output voltage applications. With a maximum output voltage of 35V and a switch current of over 350 mA, the MIC2619 can easily supply most high voltage bias applications, such as TV tuners. 2.8V to 6.5V Input Voltage 350 mA Switch Current Output Voltage up to 35V 1.2 MHz PWM Operation 1.265V Feedback Voltage Programmable Overvoltage Protection (OVP) 1.265V — 0.2 1 % 2.8V ≤ VIN ≤ 6.5V — 0.3 — % 5 mA ≤ IOUT ≤ 20 mA — 85 90 — % — Switch Current Limit ISW 350 — — mA VIN = 3.6V (Note 2) Switch Saturation Voltage VSW — 400 — mV VIN = 3.6V, ISW = 300 mA µA Load Regulation Maximum Duty Cycle Switch Leakage Current Enable Threshold Enable Pin Current IEN — 0.01 1 1.5 — — — — 0.4 — 14 40 µA V VEN = 0V, VSW = 10V Turn On Turn Off VEN = 6.5V fO — 1.2 — MHz — Overvoltage Protection VOVP 1.202 1.265 1.328 V — OVP Input Current IOVP Oscillator Frequency Overtemperature Threshold Shutdown Note 1: 2: — –200 — nA VOVP = 1.265V — 150 — °C — — 10 — °C Hysteresis Specification for packaged product only. Ensured by design.  2022 Microchip Technology Inc. and its subsidiaries DS20006545A-page 3 MIC2619 TEMPERATURE SPECIFICATIONS (Note 1) Parameters Sym. Min. Typ. Max. Units Conditions Junction Temperature Range TJ –40 — +125 °C — Ambient Storage Temperature Range TS –65 — +150 °C Soldering, 5 sec. θJA — 177 — °C/W Temperature Ranges Package Thermal Resistance Thermal Resistance, TSOT 6-Ld Note 1: — The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability. DS20006545A-page 4  2022 Microchip Technology Inc. and its subsidiaries MIC2619 2.0 Note: TYPICAL PERFORMANCE CURVES The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 70% 100% 90% 60% V IN =5V 50% 70% EFFICIENCY (%) EFFICIENCY (%) 80% V IN =4.2V 60% 40% V IN =3.6V 50% V IN =3V 40% V IN =6.5V 30% 30% 20% 20% 10% L = 10μH C = 1μF 10% 0% 0% 0 FIGURE 2-1: 50 100 150 LOAD CURR ENT (mA) 200 Efficiency VOUT = 5V. 0 10.10 10.08 OUTPUT VOLTAGE (V) 10.06 10.04 60% 10.02 V IN =5V 50% V IN =3.3V 10.00 40% 30% 20% L = 10μH C = 1μF 10% 9.98 9.96 V IN = 3.6V L = 10μH C = 1μF 9.94 9.92 9.90 0% 0 20 40 60 80 0 100 LOAD CURRENT (mA) FIGURE 2-2: Efficiency VOUT = 10V. FIGURE 2-5: 10V). 10 20 30 40 50 60 LOAD CURR ENT (mA) 70 Load Regulation (VOUT = 35.5 90% 35.4 OUTPU T VOLTAGE (V) 80% 70% EFFICIENCY (%) 16 Efficiency VOUT = 35V. 80% 60% V IN =5V 50% V IN =3.3V 40% 30% 20% L = 10μH C = 1μF 10% 35.3 35.2 35.1 35.0 34.9 34.8 34.7 V IN = 5V L = 10μH C = 1μF 34.6 0% 34.5 0 FIGURE 2-3: 4 8 12 LOAD CURRENT (mA) FIGURE 2-4: 90% 70% EFFICIENCY (%) L = 10μH C = 1μF 20 40 60 LOAD CUR RENT (mA) 80 Efficiency VOUT = 12V.  2022 Microchip Technology Inc. and its subsidiaries 0 FIGURE 2-6: 35V). 2 4 6 8 10 LOAD CURR ENT (mA) 12 Load Regulation (VOUT = DS20006545A-page 5 12.20 1100 12.16 1000 12.12 900 CU RRENT LIMIT (mA) OUTPUT VOLTAGE (V) MIC2619 12.08 12.04 12.00 11.96 11.92 11.88 IOU T = 40mA L = 10μH C = 1μF 11.84 700 600 500 400 200 3 3.5 FIGURE 2-7: 12V). 4 4.5 5 5.5 6 INPUT VOLTAGE (V) 6.5 Line Regulation (VOUT = 3 35.4 800 35.3 700 C URRENT LIMIT (mA) 900 35.2 35.1 35.0 34.9 34.8 IOU T = 10mA L = 10μH C = 1μF 34.7 34.6 FIGURE 2-8: 35V). 400 300 FIGURE 2-9: DS20006545A-page 6 3.5 4 4.5 5 5.5 6 INPUT VOLTAGE (V) V IN = 3.6V 200 V OU T = 12V L = 10μH C = 1μF 0 -40 -20 6.5 V OU T = 12V L = 10μH C = 1μF ILOAD = 40mA 3 Switch Current Limit vs. 100 Line Regulation (VOUT = 1.50 1.45 1.40 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 0.95 0.90 6.5 500 FIGURE 2-11: Temperature. 3.50 3.25 3.00 2.75 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 20 40 60 80 100 120 Switch Current Limit vs. V F B = 3V No Switching 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 INPUT VOLTAGE (V) 6.5 Frequency vs. Input Voltage. 0 TEMPERATUR E (°C) QUIESCENT CURRENT (mA) 4.9 5.3 5.7 6.1 INPUT VOLTAGE (V) 4 4.5 5 5.5 6 IN PU T VOLTAGE (V) 600 34.5 4.5 3.5 FIGURE 2-10: Input Voltage. 35.5 FREQUENCY (MHz) V OU T = 12V L = 10μH C = 1μF 300 11.80 OUTPUT VOLTAGE (V) 800 FIGURE 2-12: Voltage. Quiescent Current vs. Input  2022 Microchip Technology Inc. and its subsidiaries MIC2619 1.34 VIN = 5V VOUT = 35V IOUT = 10mA CFF = 0.22μF L = 10μH C = 1μF 1.30 1.26 V IN = 3.6V 1.24 VOUT (10V/div) 1.28 V OU T = 12V 1.22 IOU T = 25mA L = 10μH C = 1μF 1.20 1.18 -40 -20 FIGURE 2-13: Temperature. VEN (1V/div) FEEDB ACK VOLTAGE (V) 1.32 0 20 40 60 80 100 120 TEMPER ATURE (°C) Feedback Voltage vs. Time (4ms/div) FIGURE 2-16: Soft-Start. Enable Turn-On with 1.40 1.30 1.20 1.15 1.10 V IN = 3.6V 1.05 V OU T = 12V 1.00 IOU T = 25mA L = 10μH C = 1μF 0.95 0.90 -40 -20 VIN = 5V VOUT = 35V IOUT = 10mA L = 10μH COUT = 1μF 0 20 40 60 80 100 120 TEMPERATURE (°C) Switching Frequency vs. Time (2ms/div) FIGURE 2-17: Input Turn-On. VEN (1V/div) VIN = 5V VOUT = 35V IOUT = 10mA L = 10μH C = 1μF Time (400μs/div) FIGURE 2-15: Enable Turn-On.  2022 Microchip Technology Inc. and its subsidiaries NOISE_OUT NOISE_IN (AC-Coupled) (AC-Coupled) VSW (50mV/div) (20mV/div) (10V/div) VOUT (10V/div) INDUCTOR (200mA/div) FIGURE 2-14: Temperature. VOUT (10V/div) 1.25 VIN (2V/div) SWITCHING FREQUENCY (M Hz) 1.35 VIN = 4.2V IOUT = 20mA COUT = 1μF VOUT = 12V L = 10μH FIGURE 2-18: Continuous. Time (400ns/div) Switching Waveform – DS20006545A-page 7 VIN (500mV/div) 5V VOUT (AC-Coupled) (50mV/div) VOUT = 35V IOUT = 10mA L = 10μH C = 1μF Time (1ms/div) Time (400ns/div) FIGURE 2-19: Continuous. Switching Waveform – FIGURE 2-22: Line Transient, VOUT = 35V. VOUT (AC-Coupled) (200mV/div) INDUCTOR (200mA/div) VIN = 4.2V VOUT = 12V L = 10μH C = 1μF 100mA IOUT = 5mA VIN = 6V VOUT = 12V L = 10μH Time (100μs/div) Time (200ns/div) FIGURE 2-20: Discontinuous. Switching Waveform – FIGURE 2-23: Load Transient, VOUT = 12V. 6V 5V VOUT = 25V IOUT = 25mA L = 10μH C = 1μF VOUT (AC-Coupled) (50mV/div) VIN (500mV/div) COUT = 1μF 20mA VOUT (AC-Coupled) (200mV/div) NOISE_OUT NOISE_IN (AC-Coupled) (AC-Coupled) VSW (50mV/div) (20mV/div) (10V/div) 6V IOUT = 10mA COUT = 1μF VIN = 5V VOUT = 35V L = 10μH ILOAD (50mA/div) NOISE_OUT NOISE_IN (AC-Coupled) (AC-Coupled) VSW (100mV/div) (50mV/div) (20V/div) INDUCTOR (200mA/div) MIC2619 50mA ILOAD (20mA/div) 20mA Time (100μs/div) Time (1ms/div) FIGURE 2-21: DS20006545A-page 8 VIN = 5V VOUT = 25V L = 10μH C = 1μF Line Transient, VOUT = 25V. FIGURE 2-24: Load Transient, VOUT = 25V.  2022 Microchip Technology Inc. and its subsidiaries MIC2619 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: Pin Number PIN FUNCTION TABLE Pin Name Description 1 SW 2 GND Switch Node (Input): Internal power bipolar collector. 3 FB Feedback (Input): Output voltage sense node. Connect external resistor network to set output voltage. Nominal feedback voltage is 1.265V. 4 EN Enable (Input): Logic high enables regulator. Logic low shuts down regulator. Do not leave floating. 5 OVP Overvoltage Protection (Input): Programmable to 35V; adjustable through resistor divider network. 6 VIN Supply (Input): 2.8V to 6.5V for internal circuitry. Requires a minimum 1.0 µF ceramic capacitor. Ground.  2022 Microchip Technology Inc. and its subsidiaries DS20006545A-page 9 MIC2619 4.0 FUNCTIONAL DESCRIPTION The MIC2619 is a constant frequency, PWM current mode boost regulator. It is composed of an oscillator, slope compensation ramp generator, current amplifier, gm error amplifier, PWM generator, and bipolar output transistor. The oscillator generates a 1.2 MHz clock that triggers the PWM generator to turn on the output transistor and resets the slope compensation ramp generator. The current amplifier is used to measure switch current by amplifying the voltage signal from the internal sense resistor. The output of the current amplifier is summed with the output of the slope compensation ramp generator. This summed current-loop signal is then fed to one of the inputs of the PWM generator. The gm error amplifier measures the feedback voltage through the external feedback resistors and amplifies the error between the detected signal and the 1.265V reference voltage. The output of the gm error amplifier provides the voltage-loop signal that is fed to the other input of the PWM generator. When the current-loop signal exceeds the voltage loop signal, the PWM generator turns off the bipolar output transistor. The next clock period initiates the next switching cycle, maintaining the constant frequency current-mode PWM control. 4.1 should be set above the output voltage to ensure noise or other variations will not cause a false triggering of the OVP circuit. 4.4 FB The feedback pin provides the control path to control the output. FB requires a resistor divider network to the output and GND to set the output voltage. 4.5 SW The switching pin connects directly to one end of the inductor to VIN and the anode of the Schottky diode to the output. Due to the high switching speed and high voltage associated with this pin, the switch node should be routed away from sensitive nodes. 4.6 GND The ground pin is the ground path for high current PWM mode. The current loop for the power ground should be kept as small as possible. VIN VIN provides power to the control and reference circuitry as well as the switch mode regulator MOSFETs. Due to the high speed switching, a 1 µF capacitor is recommended as close as possible to the VIN and GND pin. 4.2 EN The enable pin provides a logic level control of the output. In the off state, supply current of the device is greatly reduced (typically