MIC5249-2.6YMM

MIC5249 300 mA µCap LDO with Programmable Power-On Reset Delay Features General Description • • • • The MIC5249 is an efficient, precise 300 mA CMOS voltage regulator with power on reset (POR) delay which can be implemented via an external capacitor. It offers 1% initial accuracy, extremely low dropout voltage (typically 400 mV @ 300 mA), and low ground current (typically 85 mA) over load. • • • • • • 300 mA Output Current High PSRR: 65 dB@120 Hz Stable with Ceramic Output Capacitor Power-on-Reset (POR) Output with Adjustable Delay Time High Output Accuracy: - ±1.0% Initial Accuracy - ±3.0% Over Temperature Low Dropout Voltage of 340 mV @ 300 mA Low Quiescent Current: 85 µA Zero Current Shutdown Mode Thermal Shutdown and Current-Limit Protection Tiny MSOP-8 Package Applications • Cellular Phones • PDAs • Fiber Optic Modules Designed specifically for noise-critical applications in hand-held or battery-powered devices, the MIC5249 comes equipped with a noise reduction feature to filter the output noise via an external capacitor. Other features of the MIC5249 include a logic-compatible enable pin, current limit, thermal shutdown, ultra-fast transient response, and an active clamp to speed up device turnoff. The MIC5249 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The MIC5249 is available in the MSOP-8 package. Package Type MIC5249 8-Lead MSOP (MM) (Top View) CBYP 1 DELAY 2 GND 3 VIN 4  2021 Microchip Technology Inc. and its subsidiaries 8 ENABLE 7 RESET 6 NC 5 VOUT DS20006602A-page 1 MIC5249 Typical Application Circuit Ultra-Low Noise Application Functional Block Diagram DS20006602A-page 2  2021 Microchip Technology Inc. and its subsidiaries MIC5249 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Supply Voltage (VIN) ......................................................................................................................................... 0V to +7V Enable Input Voltage (VEN) ............................................................................................................................... 0V to +7V Power Dissipation (PD), Note 1.............................................................................................................. Internally Limited ESD Rating, Note 2.................................................................................................................................... ESD Sensitive Operating Ratings ‡ Supply Voltage (VIN) .................................................................................................................................... +2.7V to +6V Enable Input 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: The maximum allowable power dissipation of any TA (ambient temperature) is PD(MAX) = (TJ(MAX) – TA)/θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 2: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series with 100 pF. ELECTRICAL CHARACTERISTICS Electrical Characteristics: VIN = VOUT + 1V; IOUT = 100 µA; TJ = +25°C; Bold values indicate –40°C to +125°C unless noted. Parameters Symbol Min. Typ. Max. –1.0 — +1.0 –3.0 — +3.0 Units Output Voltage Accuracy VOUT Line Regulation ΔVOUT/ (VOUT x ΔVIN) –0.3 0.02 +0.3 %/V Load Regulation ΔVOUT/VOUT — 1.5 3.0 % — 1 — — 160 225 275 — 340 500 600 Dropout Voltage VDO 85 150 100 200 0.35 1 — 65 — 300 440 — Ground Pin Current IGND Ground Pin Current in Shutdown ISHDN Ripple Rejection PSRR ILIM VIL — — VIH 1.6 — — IIL — 0.01 — IIH — 0.01 — Current Limit — % Enable Input Current  2021 Microchip Technology Inc. and its subsidiaries 0.4 Variation from nominal VOUT VIN = VOUT + 1V to 6V IOUT = 0.1 mA to 300 mA IOUT = 100 µA mV IOUT = 150 mA IOUT = 300 mA µA µA IOUT = 0 mA IOUT = 300 mA VEN < 0.4V (Regulator OFF) dB f = 120 Hz; COUT = 2.2 µF mA VOUT = 0V Enable Input Enable Input Voltage Conditions V µA Logic low (regulator shutdown) Logic high (regulator enabled) VIL < 0.4V (regulator shutdown) VIH > 1.6V (regulator enabled) DS20006602A-page 3 MIC5249 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Characteristics: VIN = VOUT + 1V; IOUT = 100 µA; TJ = +25°C; Bold values indicate –40°C to +125°C unless noted. Parameters Symbol Min. Typ. Max. Units Conditions Delay Pin Current Source IDELAY_TH — 0.55 1 µA — Delay Pin Threshold Voltage VDELAY_TH — 1.4 — V Threshold for RESET = Logic high — Delay Input RESET Output VTHL 89 91 Reset High Threshold VTHH — 93 96 Reset Output Logic-Low Voltage VOL — 0.02 0.1 V IRESET = 100 µA output in fault condition IRESET — 0.01 — µA Flag OFF Reset Low Threshold Flag Leakage Current % of VOUT (Flag ON) % % of VOUT (Flag OFF) TEMPERATURE SPECIFICATIONS Parameters Symbol Min. Typ. Max. Units Conditions Junction Temperature Range TJ –40 — +125 °C Storage Temperature Range TS –65 — +150 °C — Lead Temperature — — — +260 °C Soldering, 5 sec. JA — 160 — °C/W Temperature Ranges Note 1 Package Thermal Resistances Thermal Resistance, MSOP-8 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. DS20006602A-page 4  2021 Microchip Technology Inc. and its subsidiaries MIC5249 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin Number Pin Name Description 1 CBYP Reference Bypass. Connect external 0.01µF capacitor to GND to reduce output noise. May be left open. 2 DELAY Delay Set Input. Connect external capacitor to GND to set the delay of the Error Flag. 3 GND 4 VIN 5 VOUT 6 NC 7 RESET 8 ENABLE Ground. Supply input. Regulator output. No connect. RESET Output. Open-drain output. Active low indicates an output undervoltage condition. Enable Input: CMOS-compatible input. Logic high = enable; Logic low = shutdown. Do not leave open.  2021 Microchip Technology Inc. and its subsidiaries DS20006602A-page 5 MIC5249 3.0 APPLICATION INFORMATION 3.1 Enable/Shutdown The MIC5249 comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a “zero” off-mode-current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. This part is CMOS and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. 3.2 Input Capacitor The MIC5249 is a high-performance, high-bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1.0 µF capacitor 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 to filter out high frequency noise and are good practice in any RF-based circuit. 3.3 Output Capacitor The MIC5249 requires an output capacitor of 2.2 µF or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High-ESR capacitors may cause high frequency oscillation. The maximum recommended ESR is 300 mΩ. The output capacitor can be increased, but performance has been optimized for a 2.2 µF ceramic output capacitor and does not improve significantly with larger capacitance. 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. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than anX7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. 3.4 DELAY Pin Input The power-on-reset (POR) function can be implemented on the MIC5249 by adding an external capacitor from the DELAY pin to ground. This external capacitor sets the delay time (tDELAY) of the RESET output. DS20006602A-page 6 The capacitor value required can be easily calculated using the formula: EQUATION 3-1: T DELAY  I DELAY C DELAY =  -------------------------------------------   V DELAY Where: IDELAY = 0.55 µA VDELAY = 1.4V When no capacitor is used, there will be no delay and the POR output acts like a standard error FLAG output. 3.5 RESET Output The RESET output of the MIC5249 provides the power-on reset signal based on the capacitor from the DELAY pin to ground when input power is applied to the regulator. The reset signal stays low for a preset time period after power is applied to the regulator, and then goes high. The reset output is an active-low, open-drain output that drives low when a fault condition AND an undervoltage detection occurs. Internal circuitry intelligently monitors overcurrent, overtemperature and dropout conditions and ORs these outputs together to indicate some fault condition. The output of that OR gate is ANDed with an output voltage monitor that detects an undervoltage condition. The output drives an open-drain transistor to indicate a fault. This prevents chattering or inadvertent triggering of the reset. There set must be pulled up using a resistor form the RESET pin to either the input or the output. 3.6 Bypass Pin Output A bypass capacitor is required from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.01 µF capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique quick-start circuit allows the MIC5249 to drive a large capacitor on the bypass pin without significantly slowing the turn-on time. 3.7 Active Shutdown The MIC5249 also features an active shutdown clamp, which is a N-Channel MOSFET that turns on when the device is disabled. This allows the output capacitor and load to discharge, de-energizing the load.  2021 Microchip Technology Inc. and its subsidiaries MIC5249 3.8 No-Load Stability The MIC5249 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive application. 3.9 Thermal Considerations The MIC5249 is designed to provide 300 mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the device. To determine the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: EQUATION 3-2: Where: TJ(MAX) = The maximum junction temperature of the die, 125°C TA = The ambient operating temperature JA = Layout independent Table 3-1 shows examples of the junction-to-ambient thermal resistance for MIC5249. MSOP-8 THERMAL RESISTANCE Package P D  MAX  =  125C – 50C    160C/W  The junction-to-ambient thermal resistance for the minimum footprint is 160°C/W, from Table 3-1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.0V, and an output current of 300 mA, the maximum input voltage can be determined. Because this device is CMOS and the ground current is typically 90 µA over the load range, the power dissipation contributed by the ground current is < 1.0% and can be ignored for this calculation: EQUATION 3-5: T J  MAX  – T A P D  MAX  =  --------------------------------    JA TABLE 3-1: EQUATION 3-4: θJA Recommended Minimum Footprint 468mW =  V IN – 3.0V 300mA 468mW = V IN  300mA – 900mW 1368mW = V IN  300mA V IN  MAX  = 4.56V Therefore, a 3.0V application at 300 mA of output current can accept a maximum input voltage of 4.56V in the MSOP-8 package. For a full discussion of heat sinking and thermal effects on the voltage regulators, refer to the Regulator Thermals section of Designing with Low-Dropout Voltage Regulators handbook. MSOP-8 160°C/W The actual power dissipation of the regulator circuit can be determined using the equation: EQUATION 3-3: P D =  V IN – V OUT I OUT + V IN  I GND Substituting PD(MAX) for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the MIC5249-3.0YMM at 50°C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows:  2021 Microchip Technology Inc. and its subsidiaries DS20006602A-page 7 MIC5249 4.0 PACKAGING INFORMATION 4.1 Package Marking Information 8-Lead MSOP* Legend: XX...X Y YY WW NNN e3 * Example XXXX 5249 X.XY 3.3Y Product code or customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. ●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle mark). Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Package may or may not include the corporate logo. Underbar (_) and/or Overbar (‾) symbol may not be to scale. DS20006602A-page 8  2021 Microchip Technology Inc. and its subsidiaries MIC5249 8-Lead MSOP Package Outline and Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging.  2021 Microchip Technology Inc. and its subsidiaries DS20006602A-page 9 MIC5249 NOTES: DS20006602A-page 10  2021 Microchip Technology Inc. and its subsidiaries MIC5249 APPENDIX A: REVISION HISTORY Revision A (October 2021) • Converted Micrel document MIC5249 to Microchip data sheet DS20006602A. • Minor text changes throughout.  2021 Microchip Technology Inc. and its subsidiaries DS20006602A-page 11 MIC5249 NOTES: DS20006602A-page 12  2021 Microchip Technology Inc. and its subsidiaries MIC5249 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office. PART NO. Device X -XX XX Package Junction Voltage Option Temperature Range -XX Media Type Device: MIC5249: 300 mA µCap LDO with Programmable Power-On Reset Delay Voltage Option 1.5 = 1.5V 1.8 = 1.8V 2.5 = 2.5V 2.6 = 2.6V 2.8 = 2.8V 2.85 = 2.85V 3.0 = 3.0V 3.3 = 3.3V Junction Temperature Range: Y Package: MM = Media Type: =100/Tube TR = 2,500/Reel = Examples: a) MIC5249-1.8YMM 300 mA µCap LDO with Programmable Power-On Reset Delay, 1.8V, –40°C to +125°C, 8-Lead MSOP, 100/Tube b) MIC5249-1.8YMM-TR 300 mA µCap LDO with Programmable Power-On Reset Delay, 1.8V, –40°C to +125°C, 8-Lead MSOP, 2,500/Reel c) MIC5249-2.85YMM 300 mA µCap LDO with Programmable Power-On Reset Delay, 2.85V, –40°C to +125°C, 8-Lead MSOP, 100/Tube c) MIC5249-2.85YMMTR 300 mA µCap LDO with Programmable Power-On Reset Delay, 2.85V, –40°C to +125°C, 8-Lead MSOP, 2,500/Reel –40°C to +125°C Note 1: 8-Lead MSOP (Pb-Free)  2021 Microchip Technology Inc. and its subsidiaries Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering purposes and is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option. DS20006602A-page 13 MIC5249 NOTES: DS20006602A-page 14  2021 Microchip Technology Inc. and its subsidiaries Note the following details of the code protection feature on Microchip products: • Microchip products meet the specifications contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and under normal conditions. • Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not mean that we are guaranteeing the product is “unbreakable”. Code protection is constantly evolving. Microchip is committed to continuously improving the code protection features of our products. This publication and the information herein may be used only with Microchip products, including to design, test, and integrate Microchip products with your application. Use of this information in any other manner violates these terms. Information regarding device applications is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. Contact your local Microchip sales office for additional support or, obtain additional support at https:// www.microchip.com/en-us/support/design-help/client-supportservices. THIS INFORMATION IS PROVIDED BY MICROCHIP "AS IS". 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