MIC94305YMT-T5

MIC94305 500 mA Switch with Ripple Blocker™ Technology Features General Description • 1.8V to 3.6V Input Voltage Range • Active Noise Rejection Over a Wide Frequency Band - >60 dB from 40 kHz to 5 MHz • Rated to 500 mA Output Current • Current-Limit and Thermal-Limit Protected • 1.6 mm × 1.6 mm 6-Pin Thin DFN • Logic-Controlled Enable Pin • –40°C to +125°C Junction Temperature Range The MIC94305 is an integrated load switch that incorporates Microchip’s Ripple Blocker™ active filter technology. The MIC94305 provides high-frequency ripple attenuation (switching noise rejection) for applications where switching noise cannot be tolerated by sensitive downstream circuits, such as RF applications. A low voltage logic enable pin disconnects the pass element and puts the MIC94305 in a low current shutdown state when disabled. Applications • • • • • • • Smartphones Tablet PC/Notebooks and Webcams Digital Still and Video Cameras Video Conferencing Barcode Scanners Global Positioning Systems Automotive and Industrial Applications The MIC94305 operates from an input voltage of 1.8V to 3.6V, allowing true load switching of low voltage power rails in any electronic device. The output voltage (VOUT) is set at a fixed drop (typically 170 mV) from the input voltage (VOUT = VIN – 170 mV). This maintains high efficiency independent of given load conditions and currents. The MIC94305 is packaged in a 6-pin 1.6 mm x 1.6 mm Thin DFN package and has a junction operating temperature range of –40°C to +125°C. Package Type MIC94305 6-Pin TDFN (MT) (Top View) VOUT 1 6 VIN VOUT 2 5 VIN GND 3  2018 Microchip Technology Inc. EP 4 EN DS20006029A-page 1 MIC94305 Typical Application Circuit MIC94305 1.6 x 1.6 TDFN MIC94305YMT DC/DC EN CIN 4.7μF VIN VOUT EN GND LOAD COUT 4.7μF Functional Block Diagram VIN CHARGE PUMP LPF DRIVER EN BIAS AND THERMAL SHUTDOWN VOUT GND DS20006029A-page 2  2018 Microchip Technology Inc. MIC94305 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Input Voltage (VIN) .................................................................................................................................... –0.3V to +4.0V Output Voltage (VOUT) .............................................................................................................................. –0.3V to +4.0V Enable Voltage (VEN) ............................................................................................................ –0.3V to VIN+0.3V or +4.0V ESD Rating (Note 1) ................................................................................................................................................ +3 kV Operating Ratings †† Input Voltage (VIN) .................................................................................................................................... +1.8V to +3.6V Enable Voltage (VEN) ..........................................................................................................................................0V to VIN † Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. †† Notice: The device is not guaranteed to function outside its operating ratings. Note 1: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series with 100 pF. ELECTRICAL CHARACTERISTICS Electrical Characteristics: VIN = VEN = 3.6V; IOUT = 1 mA; COUT = 4.7 µF; TA = +25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Note 1 Parameter Sym. Min. Typ. Max. Units Input Voltage VIN 1.8 — 3.6 V Voltage Drop VDROP — 170 250 mV VIN Ripple Rejection PSRR — 45 — — 55 — dB Conditions — VIN – VOUT, –40°C ≤ TJ ≤ +85°C f = 20 kHz, IOUT = 500 mA f = 100 kHz to 5 MHz, IOUT = 500 mA Total Output Noise eN — 98 — Current Limit ILIM 530 725 1100 mA VOUT = 0V Turn-On Time tON — 90 150 µs EN controlled Load Regulation — — 10 — mV 100 µA to 100 mA Ground Current IGND — 150 200 µA IOUT = 100 µA Shutdown Current ISHDN — 0.2 5 µA VEN = 0V Input Logic Low — — — 0.4 V — Input Logic High — 1.0 — — V — Input Current IIN — 0.01 1 µA — µVRMS f = 10 Hz to 100 kHz Enable Note 1: Specification for packaged product only.  2018 Microchip Technology Inc. DS20006029A-page 3 MIC94305 TEMPERATURE SPECIFICATIONS Parameters Sym. Min. Typ. Max. Units Conditions TJ –40 — +125 °C — Temperature Ranges Junction Operating Temperature Lead Temperature — — — +260 °C Soldering, 10 sec. Storage Temperature Range TS –65 — +150 °C — JA — 92 — °C/W — Package Thermal Resistances Thermal Resistance, TDFN 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. DS20006029A-page 4  2018 Microchip Technology Inc. MIC94305 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. FIGURE 2-1: PSRR COUT = 4.7 µF. FIGURE 2-4: PSRR COUT = 10 µF. FIGURE 2-2: PSRR COUT = 4.7 µF. FIGURE 2-5: PSRR COUT = 10 µF. FIGURE 2-3: PSRR COUT = 4.7 µF. FIGURE 2-6: PSRR COUT = 10 µF.  2018 Microchip Technology Inc. DS20006029A-page 5 MIC94305 . FIGURE 2-7: PSRR COUT = 22 µF. FIGURE 2-10: Current. Output Voltage vs. Output FIGURE 2-8: PSRR COUT = 22 µF. FIGURE 2-11: Current. Output Voltage vs. Output FIGURE 2-9: PSRR COUT = 22 µF. FIGURE 2-12: Current. Voltage Drop vs. Output DS20006029A-page 6  2018 Microchip Technology Inc. MIC94305 FIGURE 2-13: Current. Voltage Drop vs. Input FIGURE 2-16: Density. Output Noise Spectral FIGURE 2-14: Current. Ground Current vs. Output FIGURE 2-17: Load Transient. VIN (1V/div) VOUT (1V/div) CIN = COUT = 4.7μF IOUT = 300mA Time (1.00ms/div) FIGURE 2-15: Voltage. Ground Current vs. Input  2018 Microchip Technology Inc. FIGURE 2-18: Line Transient. DS20006029A-page 7 MIC94305 VIN = 2.8V CIN = COUT = 4.7μF IOUT = 500mA VEN (1V/div) VOUT (2V/div) Time (400μs/div) FIGURE 2-19: Enable Turn-Off. VIN = 2.8V CIN = COUT = 4.7μF VEN (1V/div) VOUT (2V/div) Time (400μs/div) FIGURE 2-20: DS20006029A-page 8 Enable Turn-On.  2018 Microchip Technology Inc. MIC94305 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE Pin Number Pin Name 1, 2 VOUT Power switch output. 3 GND Ground. 4 EN Enable Input. A logic-high signal on this pin enables the part. Logic-low disables the part. Do not leave floating. 5, 6 VIN Power switch input and chip supply. ePad EP Exposed heatsink pad. Connect to Ground for best thermal performance.  2018 Microchip Technology Inc. Description DS20006029A-page 9 MIC94305 4.0 APPLICATION INFORMATION The MIC94305 uses Ripple Blocker technology to integrate a load switch with a high-performance active filter. The MIC94305 includes a low voltage logic enable pin and is fully protected from damage caused by fault conditions, offering linear current-limiting and thermal shutdown. 4.1 Input Capacitor The MIC94305 is a high-performance, high-bandwidth device. An input capacitor of 0.47 µF is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional high-frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics lose most of their capacitance over temperature and are not recommended. 4.2 X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. If you use a ceramic-chip capacitor with a Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. No-Load Stability The MIC94305 will remain stable with no load. This is especially important in CMOS RAM keep-alive applications. 4.4 4.5 Thermal Considerations The MIC94305 is designed to provide 500 mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part, which is fixed at 170 mV typical, 250 mV worst case. For example if the input voltage is 2.75V, the output voltage is 2.5V, and the output current equals 500 mA. The actual power dissipation of the Ripple Blocker™ can be determined using Equation 4-1: EQUATION 4-1: P D =  V IN – V OUT I OUT + V IN I GND Output Capacitance The MIC94305 requires an output capacitor of 4.7 µF or greater to maintain stability. For optimal ripple rejection performance, a 4.7 µF capacitor is recommended. The design is optimized for use with low-ESR ceramic-chip capacitors. High-ESR capacitors are not recommended because they may cause high-frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 4.7 µF ceramic output capacitor and does not improve significantly with larger capacitance. 4.3 consumed by the MIC94305 goes to nearly zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Enable/Shutdown The MIC94305 comes with an active-high enable pin that allows the Ripple Blocker to be disabled. Forcing the enable pin low disables the MIC94305 and sends it into a “zero” off mode current state. In this state, current DS20006029A-page 10 Because this device is CMOS and the ground current is typically