MIC2230 - Dual Synchronous 800 mA/800 mA Step-Down ww1. • Stable with 2.2...

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Transcript of MIC2230 - Dual Synchronous 800 mA/800 mA Step-Down ww1. • Stable with 2.2...

  • 2017 Microchip Technology Inc. DS20005748A-page 1

    MIC2230

    Features High Efficiency: Over 96% Ultra-Low Quiescent Current: Only 28 A Ultra-Low Shutdown Current: Less Than 1 A Fast Transient Performance 2.5 MHz PWM Operation High Output Current Capability per Channel:

    800 mA No Schottky Diodes Required Stable with 2.2 H Inductor, 10 F Ceramic

    Capacitor Adjustable Output Voltage Down to 0.8V Built-In Soft-Start Circuitry Current-Limit Protection Automatic Switching into Light Load Mode

    Operation /FPWM Pin allows Low-Noise Forced PWM Mode

    Operation Power Good Output with Internal 5 A Current

    Source allows Sequencing with Programmable Delay Time

    Small Thermally Enhanced 3 mm 3 mm TDFN-12L Package

    Applications MPU & ASIC Power PDAs Digital Cameras PC Cards Wireless and DSL Modems

    General DescriptionThe MIC2230 is a dual output, high-efficiencysynchronous step-down DC/DC converter. TheMIC2230 is ideally suited for portable and embeddedsystems that demand high power conversionefficiencies and fast transient performance, whileoffered in a very small package. The MIC2230 offers anultra-low quiescent current in light load mode, assuringminimum current draw from battery poweredapplications in standby modes. The MIC2230 wasdesigned to only require miniature 2.2 H inductorsand 10 F ceramic capacitors.

    The MIC2230 features a selectable mode that allowsthe user to trade-off lowest noise performance for lowpower efficiency. Trickle mode operation providesultra-high efficiency at light loads, while PWM operationprovides very low ripple noise performance. Tomaximize battery life in low-dropout conditions,MIC2230 can operate with a maximum duty cycle of100%.

    The MIC2230 is available in a space-saving3 mm 3 mm TDFN-12L package with a junctiontemperature range from 40C to +125C.

    Package TypesMIC2230

    3x3 TDFN* (Fixed)Top View

    AGND SW15

    1OUT2

    EN2

    AVIN

    SW2

    12 OUT1

    EN1

    PGOOD

    VIN

    11

    10

    9

    2

    3

    4

    8

    PGND /FPWM6 7

    MIC22303x3 TDFN* (Adjustable)

    Top View

    AGND SW15

    1FB2

    EN2

    AVIN

    SW2

    12 FB1

    EN1

    PGOOD

    VIN

    11

    10

    9

    2

    3

    4

    8

    PGND /FPWM6 7

    Dual Synchronous 800 mA/800 mA Step-Down DC/DC Regulator

  • MIC2230

    DS20005748A-page 2 2017 Microchip Technology Inc.

    Typical Application Circuit

    Functional Block Diagram

    MIC22303x3 TDFN

    EN2

    SW2

    PGND

    OUT2

    PGOOD

    VIN2.5V to 5.5V

    10F

    10F

    VOUT11.8V / 800mA

    EN1

    MIC2230/FPWM

    SW1

    OUT1

    2.2H

    VINAVIN

    AGND

    10F

    390pF

    2.2H VOUT21.575V / 800mA

    ONOFF

    ONOFF

    CompensationTrickle Mode

    Logic

    AntiShoot-throughLogic

    HSD

    LSD

    AntiShoot-through

    Logic

    HSD

    LSD

    ENABLELOGIC

    VIN

    EN1

    SW1

    PGOOD

    FB1

    PGND AGND

    FB2

    /FPWM

    SW2

    EN2

    AVIN

    ISENSE2ISENSE1

    AVIN

    EA1 EA2

    5A

    0.8V 0.8V

    1k

  • 2017 Microchip Technology Inc. DS20005748A-page 3

    MIC22301.0 ELECTRICAL CHARACTERISTICS

    Absolute Maximum Ratings Supply Voltage, (VIN) ................................................................................................................................................. +6VEnable 1 Voltage........................................................................................................................................................ +6VEnable 2 Voltage........................................................................................................................................................ +6VLogic Input Voltage, (VEN, VFPWM)..................................................................................................................... 0V to VINESD Protection.........................................................................................................................................................+2 kV

    Operating Ratings Supply Voltage, VIN..................................................................................................................................... +2.5V to 5.5V

    Notice: Exceeding the absolute maximum rating may damage the device. Notice: The device is not guaranteed to function outside its operating rating.

    DC CHARACTERISTICS (Note 1) Electrical Characteristics: Unless otherwise indicated, TA = 25C with VIN = VEN1 = VEN2 = 3.6V, VOUT1, VOUT2: L = 2.2 H, C = 10 F. Bold values indicate 40C TJ +125C.

    Parameters Sym. Min. Typ. Max. Units Conditions

    Supply Voltage and Current

    Supply Voltage Range 2.5 5.5 V

    UVLO (Rising) 2.3 2.4 2.5 V

    UVLO Hysteresis 100 mV

    PWM Mode Supply Current 560 950 A

    /FPWM = Low; VOUT1,VOUT2 = 1.03 * VNOM (not switching)

    Trickle Mode Supply Current 28 50 A

    /FPWM = High; VOUT1,VOUT2 = 1.03 * VNOM (not switching)

    Shutdown Quiescent Current 0.1 1 A VEN = 0V

    Output Voltage Accuracy

    Feedback Voltage, VFB 0.780 0.8 0.820 V Adjustable

    Output Voltage, VOUT 2.5 +2.5 % Fixed Output Options

    Feedback Bias Current 10 nA

    Output Voltage Line Regulation 0.1 0.5 % 2.5V VIN 5.5V

    Output Voltage Load Regulation 0.5 %

    VIN = 5V, IOUT = 10 mA to 800 mA, /FPWM = 0VVIN = 3V; IOUT = 10 mA to 800 mA, /FPWM = 0V

    Ripple in Trickle Mode 40 mV VIN=3.6V; IOUT = 1 mA; COUT = 10 F, L = 2.2 H.

    Note 1: Specification for packaged product only.

  • MIC2230

    DS20005748A-page 4 2017 Microchip Technology Inc.

    Logic Inputs

    EN Input Threshold 0.8 1.2 V On

    0.3 0.7 V Off

    EN Input Current 0.01 1 A

    /FPWM Input Threshold 0.6VIN V On

    0.3VIN V Off

    /FPWM Input Current 0.01 1 A

    Protection

    Current-Limit 0.9 1.2 1.8 A

    Control

    Maximum Duty Cycle 100 %

    Oscillator

    PWM Mode Frequency 2.125 2.5 2.875 MHz

    Power Good

    Power Good Reset Threshold

    6.25 12 % Upper Threshold14 8.5 % Lower Threshold

    PGOOD Series Resistance 1 1.4 k

    PGOOD Pull-Up Current 5 A Output within 8.5% of regulation

    Power Switch

    Switch On-Resistance 0.4 ISW = 150 mA (PFET)

    0.35 ISW = 150 mA (NFET)

    DC CHARACTERISTICS (Note 1) (CONTINUED)Electrical Characteristics: Unless otherwise indicated, TA = 25C with VIN = VEN1 = VEN2 = 3.6V, VOUT1, VOUT2: L = 2.2 H, C = 10 F. Bold values indicate 40C TJ +125C.

    Parameters Sym. Min. Typ. Max. Units Conditions

    Note 1: Specification for packaged product only.

  • 2017 Microchip Technology Inc. DS20005748A-page 5

    MIC2230

    TEMPERATURE SPECIFICATIONS (Note 1)Parameters Sym. Min. Typ. Max. Units Conditions

    Temperature RangesStorage Temperature Range TA 65 +150 C Junction Operating Temperature TJ 40 +125 C Package Thermal Resistances

    Thermal Resistance, 3 x 3 QFN-12LdJA 60 C/W JC 15 C/W

    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 +125C rating. Sustained junction temperatures above +125C can impact the device reliability.

  • MIC2230

    DS20005748A-page 6 2017 Microchip Technology Inc.

    2.0 TYPICAL PERFORMANCE CURVES

    FIGURE 2-1: Enabled Threshold vs. Temperature.

    FIGURE 2-2: Frequency vs. Temperature.

    FIGURE 2-3: Efficiency.

    FIGURE 2-4: MIC2230 Efficiency VOUT = 1.575V.

    FIGURE 2-5: MIC2230 Efficiency VOUT = 1.8V.

    FIGURE 2-6: MIC2230 Efficiency VOUT1 = VOUT2 = 1.8V.

    Note: The graphs and tables provided following this note are a statistical summary based on a limited number ofsamples and are provided for informational purposes only. The performance characteristics listed hereinare not tested or guaranteed. In some graphs or tables, the data presented may be outside the specifiedoperating range (e.g., outside specified power supply range) and therefore outside the warranted range.

  • 2017 Microchip Technology Inc. DS20005748A-page 7

    MIC2230

    FIGURE 2-7: Capacitance vs. Delay Time.

    FIGURE 2-8: Trickle Mode Current vs. Input Voltage.

    FIGURE 2-9: Output Voltage vs. Input Voltage.

    .

    FIGURE 2-10: Output Voltage vs. Load.

    FIGURE 2-11: Enable Threshold vs. Supply Voltage.

    FIGURE 2-12: Feedback Voltage vs. Temperature.

  • MIC2230

    DS20005748A-page 8 2017 Microchip Technology Inc.

    FIGURE 2-13: Output Voltage vs. Temperature.

    FIGURE 2-14: FPWM Mode.

    FIGURE 2-15: Trickle Mode.

    FIGURE 2-16: Load Transient Trickle Mode.

    FIGURE 2-17: Load Transient Trickle Mode.

    FIGURE 2-18: Load Transient PWM Mode.

    VS

    W(2

    V/d

    iv)

    Out

    put V

    olta

    geA

    C C

    oupl

    ed(2

    0mV

    /div

    )In

    duct

    or C

    urre

    nt(2

    00m

    A/d

    iv)

    0A

    200ns/div

    VIN = 3.6VVOUT = 1.8VL = 2.2H/FPWM = 0IOUT = 400mA

  • 2017 Microchip Technology Inc. DS20005748A-page 9

    MIC2230

    FIGURE 2-19: Load Transient PWM Mode.

    FIGURE 2-20: Enable Response.

  • MIC2230

    DS20005748A-page 10 2017 Microchip Technology Inc.

    3.0 PIN DESCRIPTIONSThe descriptions of the pins are listed in Table 3-1.

    TABLE 3-1: PIN FUNCTION TABLE MIC2230

    Adjustable3X3 QFN

    MIC2230Fixed

    3X3 QFNSymbol Description

    1 FB2 Feedback 2: For adjustab