MIC2205-1.3YML-TR

MIC2205 2 MHz PWM Synchronous Buck Regulator with LDO Standby Mode Feature General Description • 2.7 to 5.5V Supply Voltage • Light Load LDO Mode - 18 μA Quiescent Current - Low Noise, 75 μVRMS • 2 MHz PWM Mode - Output Current to 600 mA - >95% Efficiency - 100% Maximum Duty Cycle • Adjustable Output Voltage Option Down to 1V - Fixed Output Voltage Options Available • Ultra-Fast Transient Response • Stable with 1 μF Ceramic Output Capacitor • Fully Integrated MOSFET Switches • Micropower Shutdown • Thermal Shutdown and Current Limit Protection • Pb-Free 3 mm x 3 mm VDFN Package • –40°C to +125°C Junction Temperature Range The MIC2205 is a high efficiency 2 MHz PWM synchronous buck (step-down) regulator that features an LDO standby mode that draws only 18 μA of quiescent current. The MIC2205 allows an ultra-low noise, small size, and high efficiency solution for portable power applications. In PWM mode, the MIC2205 operates with a constant frequency 2 MHz PWM control. Under light load conditions, such as in system sleep or standby modes, the PWM switching operation can be disabled to reduce switching losses. In this light load mode, the LDO maintains the output voltage and draws only 18 μA of quiescent current. The LDO mode of operation saves battery life while not introducing spurious noise and high ripple as experienced with pulse skipping or bursting mode regulators. Applications The MIC2205 operates from 2.7V to 5.5V input and features internal power MOSFETs that can supply up to 600 mA output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low dropout conditions. • Cellular Phones • PDAs • USB Peripherals The MIC2205 is available in a 3 mm x 3 mm VDFN-10L package with an operating junction temperature range from –40°C to +125°C. Package Type MIC2205 VDFN-10 (ML)  2019 Microchip Technology Inc. DS20006177A-page 1 MIC2205 Functional Block Diagram Typical Application MIC2205 VIN 2.7V to 5.5V C1 1μF LowQ C2 0.1μF 8 VIN 4 AVIN 6 EN 7 LOWQ 3 BIAS SW 9 LDO 2 FB 5 2.2μH R1 100k R2 125k VOUT C3 100pF C4 2.2μF PGND AGND GND DS20006177A-page 2 10 1 GND  2019 Microchip Technology Inc. MIC2205 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Supply Voltage (VIN) .................................................................................................................................................. +6V Output Switch Voltage (VSW) ..................................................................................................................................... +6V Output Switch Current (ISW)..........................................................................................................................................2A Logic Input Voltage (VEN, VLOWQ)) ................................................................................................................ –0.3V to VIN Storage Temperature (TS) ......................................................................................................................–60°C to +150°C ESD Rating (Note 1) ..................................................................................................................................................3 kV Operating Ratings ‡ Supply Voltage (VIN) ................................................................................................................................. +2.7V to +5.5V Logic Input Voltage (VEN, VLOWQ)) ................................................................................................................ –0.3V to VIN Junction Temperature (TJ)......................................................................................................................–40°C to +125°C Package Thermal Resistance VDFN-10 (JA)...................................................................................................................................................... 60°C/W † 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. Specifications are for packaged product only. ‡ Notice: The device is not guaranteed to function outside its operating ratings. Note 1: Devices are ESD sensitive. Handling precautions recommended. Human body model: 1.5 kΩ in series with 100 pF. ELECTRICAL CHARACTERISTICS (Note 2) Electrical Characteristics: VIN= VEN = VLOWQ = 3.6V; L = 2.2 μH; TA = 25°C, Bold values indicate –40°C ≤ TA ≤ +125°C; unless otherwise noted. Parameter Symbol Min. Typ. Max. Supply Voltage Range — 2.7 — 5.5 Undervoltage Lockout Threshold — 2.45 2.55 UVLO Hysteresis — — 100 Quiescent Current, PWM mode — — Quiescent Current, LDO mode — — Shutdown Current — — [Adjustable] Feedback Voltage — 0.99 0.98 [Fixed Output] Voltages — FB pin input current Current Limit in PWM Mode Units Conditions V — 2.65 V Turn-On — mV — 690 900 μA VFB = 0.9 * VNOM (not switching) 16 29 μA VLOWQ = 0V; IOUT = 0 mA 0.01 5 μA VEN = 0V 1 1.01 1.02 V ±1% ±2% (over temperature) –1 –2 — +1 +2 % Nominal VOUT tolerance — — 1 — nA — — 0.75 1 1.85 A VFB = 0.9 * VNOM Output Voltage Line Regulation — — 0.13 — % VOUT > 2V; VIN = VOUT + 300 mV to 5.5V; ILOAD = 100 mA VOUT < 2V; VIN = 2.7V to 5.5V; ILOAD = 100 mA Output Voltage Load Regulation, PWM Mode — — 0.2 0.5 % 20 mA < ILOAD < 300 mA Output Voltage Load Regulation, LDO Mode — — 0.1 0.2 % 100 μA < ILOAD < 50 mA VLOWQ = 0V Maximum Duty Cycle — 100 — — % VFB ≤ 0.4V  2019 Microchip Technology Inc. DS20006177A-page 3 MIC2205 ELECTRICAL CHARACTERISTICS (Note 2) Electrical Characteristics: VIN= VEN = VLOWQ = 3.6V; L = 2.2 μH; TA = 25°C, Bold values indicate –40°C ≤ TA ≤ +125°C; unless otherwise noted. Parameter Symbol Min. Typ. Max. — — 0.4 — — — 0.4 — Oscillator Frequency — 1.8 2 2.2 MHz — LOWQ Threshold Voltage — 0.5 0.85 1.3 V — LOWQ Input Current — — 0.1 2 μA — Enable Threshold — 0.5 0.85 1.3 V — Enable Input Current — — 0.1 2 μA — LDO Dropout Voltage (Note 1) — — 110 — mV IOUT = 50 mA Output Voltage Noise — — 75 — μVrms LOWQ = 0V; COUT = 2.2 μF, 10 Hz to 100 kHz LDO Current Limit — 60 120 — mA LOWQ = 0V; VOUT = 0V (LDO Mode) Overtemperature Shutdown — — 160 — °C — Overtemperature Hysteresis — — 20 — °C — PWM Switch-On Resistance Note 1: 2: Units Conditions Ω ISW = 50 mA VFB = 0.7VFB_NOM (High Side Switch) ISW = -50 mA VFB = 1.1VFB_NOM (Low Side Switch) Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value that is initially measured at a 1V differential. For outputs below 2.7V, the dropout voltage is the input-to-output voltage differential with a minimum input voltage of 2.7V S pe cifica tion for pa cka ge d product only. DS20006177A-page 4  2019 Microchip Technology Inc. MIC2205 TEMPERATURE SPECIFICATIONS (Note 1) Parameters Symbol Min. Typ. Max. Units Conditions Storage Temperature TS –60 — +150 °C — Junction Temperature Range TJ –40 — +125 °C — JA — — 60 °C/W — Temperature Ranges Package Thermal Resistances Thermal Resistance 10-Lead VDFN 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.  2019 Microchip Technology Inc. DS20006177A-page 5 MIC2205 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. PWM Mode FIGURE 2-1: Bode Plot. FIGURE 2-4: 1.5 VOUT Efficiency. FIGURE 2-2: 2.5 VOUT Efficiency. FIGURE 2-5: 1.38 VOUT Efficiency. FIGURE 2-3: 1.8 VOUT Efficiency. FIGURE 2-6: 1.2 VOUT Efficiency. DS20006177A-page 6  2019 Microchip Technology Inc. MIC2205 FIGURE 2-7: 1.0 VOUT Efficiency. FIGURE 2-10: Frequency vs. Temperature. FIGURE 2-8: Load Regulation. FIGURE 2-11: Voltage. Peak Current Limit vs. FIGURE 2-9: Supply Voltage. Quiescent Current vs. FIGURE 2-12: Voltage. Enable Threshold vs.  2019 Microchip Technology Inc. DS20006177A-page 7 MIC2205 FIGURE 2-13: Voltage. Turn-On Time vs. Supply FIGURE 2-16: Dropout vs. Output Current. FIGURE 2-14: PSRR. FIGURE 2-17: Voltage. Current Limit vs. Supply FIGURE 2-15: PSRR. FIGURE 2-18: Temperature. Dropout Voltage vs. LDO Mode DS20006177A-page 8  2019 Microchip Technology Inc. MIC2205 FIGURE 2-19: Temperature. Dropout Voltage vs. FIGURE 2-22: Temperature. FIGURE 2-20: Temperature. Dropout Voltage vs. FIGURE 2-23: Enable Threshold Voltage vs. Supply Voltage. FIGURE 2-21: Temperature. Dropout Voltage vs. FIGURE 2-24: Voltage.  2019 Microchip Technology Inc. Output Voltage vs. Turn-On Time vs. Supply DS20006177A-page 9 MIC2205 FIGURE 2-25: Temperature. Quiescent Current vs. FIGURE 2-28: Output Current. Quiescent Current vs. FIGURE 2-26: Temperature. Quiescent Current vs. FIGURE 2-29: Current. Output Voltage vs. Output FIGURE 2-27: Supply Voltage. Quiescent Current vs. FIGURE 2-30: Load Transient PWM Mode. DS20006177A-page 10  2019 Microchip Technology Inc. MIC2205 FIGURE 2-31: Load Transient LDO Mode. FIGURE 2-34: Transient. PWM Mode to LDO Mode FIGURE 2-32: Mode. Enable Transient PWM FIGURE 2-35: Transient. LDO Mode to PWM Mode FIGURE 2-33: Mode. Enable Transient LDO FIGURE 2-36: PWM Waveform.  2019 Microchip Technology Inc. DS20006177A-page 11 MIC2205 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 Description 1 AGND 2 LDO LDO (Output): Connect to VOUT for LDO mode operation. 3 BIAS Internal circuit bias supply. Must be de-coupled to signal ground with a 0.1 μF capacitor and should not be loaded. 4 AVIN Analog Supply Voltage (Input): Supply voltage for the analog control circuitry and LDO input power. Requires bypass capacitor to GND. Analog (Signal) Ground. 5 FB Feedback. Input to the error amplifier. For the adjustable option, connect to the external resistor divider network to set the output voltage. For fixed output voltage options, connect the feed forward capacitor between this pin and VOUT; the internal resistor network sets the output voltage. 6 EN Enable (Input). Logic low will shut down the device, reducing the quiescent current to less than 5 μA. 7 LOWQ Enable LDO Mode (Input): Logic low enables the internal LDO and disables the PWM operation. Logic high enables the PWM mode and disables the LDO mode. 8 VIN Supply Voltage (Input): Supply voltage for the internal switches and drivers. Switch (Output): Internal power MOSFET output switches. 9 SW 10 PGND EP GND DS20006177A-page 12 Power Ground. Ground, backside pad.  2019 Microchip Technology Inc. MIC2205 4.0 FUNCTIONAL DESCRIPTION 4.1 VIN VIN provides power to the MOSFETs for the switch mode regulator section, along with the current limiting sensing. Due to the high switching speeds, a 1 μF capacitor is recommended close to VIN and the power ground (PGND) pin for bypassing. 4.2 LDO The LDO pin is the output of the linear regulator and should be connected to the output. In LOWQ mode (LOWQ < 1.5V), the LDO provides the output voltage. In PWM mode (LOWQ > 1.5V) the LDO pin is high impedance. 4.4 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