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        M3406

        1.5MHz, 600mA Synchronous Step-Down Converter

        FEATURES

        • High Efficiency: Up to 96%
        • 1.5MHz Constant Frequency Operation
        • 600mA Output Current
        • No Schottky Diode Required
        • 2.3V to 5.5V Input Voltage Range
        • Output Voltage as Low as 0.6V
        • 100% Duty Cycle in Dropout
        • Low Quiescent Current: 20µA
        • Slope Compensated Current Mode Control for Excellent Line and Load Transient Response
        • Short Circuit Protection
        • Thermal Fault Protection
        • Inrush Current Limit and Soft Start
        • <1µA Shutdown Current
        • Tiny SOT23-5 Package

        APPLICATIONS

        • Cellular and Smart Phones
        • Wireless and DSL Modems
        • PDAs
        • Digital Still and Video Cameras
        • MP3 Players

        The M3406 is a constant frequency, current mode PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low as 0.6V. The M3406 can also run at 100% duty cycle for low dropout operation, extending battery life in portable system. This device offers two operation modes, PWM control and PFM Mode switching control, which allows a high efficiency over the wider range of the load.
        The M3406 is offered in a low profile (1mm) 5-pin, thin SOT package, and is available in an adjustable version and fixed output voltage of 1.2V,1.5V, 1.8V,2.5V and 3.3V.


        Typical Application

        Basic Application Circuit Output
        Absolute Maximum Ratings (Note 1)
        Input Supply Voltage ……… -0.3V to 6V
        RUN,VOUT Voltages……… -0.3V to 6V
        SW Voltage ………………-0.3V to (Vin+0.3V)
        Peak SW Sink and Source Current…1.8A
        Operating Temperature Range … -40°C to +85°C
        Junction Temperature(Note2) ……………125°C
        Storage Temperature Range…-65°C to 150°C
        Lead Temperature(Soldering,10s) …+300°C

        Package/Order Information

        sot23-5

        Part Number SWICHING FREQUENCY Temp Range OUTPUT VOLTAGE (V) OUTPUT CURRENT (A)
        M3406-ADJ 1.5MHz -40°C to +85°C ADJ 0.6

         

        Pin Description

        PIN

        NAME

        FUNCTION

        1

        RUN

        Chip Enable Pin. Drive RUN above 1.5V to turn on the part. Drive RUN below 0.3V to turn it off. Do not leave RUN floating.

        2

        GND

        Ground Pin

        3

        SW

        Power Switch Output. It is the switch node connection to Inductor. This pin connects to the drains of the internal P-ch and N-ch MOSFET switches.

        4

        VIN

        Power Supply Input. Must be closely decoupled to GND with a 4.7µF or greater ceramic capacitor.

        5

        VOUT

        Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for comparison to the internal reference voltage.

         

        Electrical Characteristics (Note 3)

        (VIN=VRUN=3.6V, VOUT=1.8V, TA = 25°C, unless otherwise noted.)

        Parameter

        Conditions

        MIN

        TYP

        MAX

        unit

        Input Voltage Range

         

        2.3

         

        6

        V

        UVLO Threshold

         

        1.7

        1.9

        2.1

        V

        Input DC Supply Current
        PWM Mode
        PFM Mode
        Shutdown Mode

        (Note 4)
        Vout = 90%, Iload=0mA Vout = 105%, Iload=0mA VRUN = 0V, VIN=4.2V

         


        140
        20
        0.1


        300
        35
        1.0

        µA µA µA µA

        Regulated Feedback Voltage

        TA = 25°C

        0.588

        0.600

        0.612

        V

        TA = 0°C ≤ TA ≤ 85°C

        0.586

        0.600

        0.613

        V

        TA = -40°C ≤ TA ≤ 85°C

        0.585

        0.600

        0.615

        V

        Reference Voltage Line Regulation

        Vin=2.7V to 5.5V

         

        0.04

        0.40

        %/V

        Output Voltage Line Regulation

        VIN = 2.7V to 5.5V

         

        0.04

        0.4

        %

        Output Voltage Load Regulation

         

         

        0.5

         

        %

        Oscillation Frequency

        Vout=100% Vout=0V

         

        1.5

         

        MHz

         

        300

         

        KHz

        On Resistance of PMOS

        ISW=100mA

         

        0.35

        0.45

        Ω

        ON Resistance of NMOS

        ISW=-100mA

         

        0.3

        0.45

        Ω

        Peak Current Limit

        VIN= 3V, Vout=90%

         

        1.5

         

        A

        RUN Threshold

         

        0.30

        1.0

        1.50

        V

        RUN Leakage Current

         

         

        ±0.01

        ±1.0

        µA

        SW Leakage Current

        VRUN=0V,VIN=Vsw=5V

         

        ±0.01

        ±1.0

        µA

        Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
        Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD) x (250°C/W).
        Note3: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
        Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency

         

        Typical Performance Characteristics

        12v

        15v

        18v

        25v

        output

        Oscillator

        temperature

        pfm mode

         

        Functional Block Diagram

        m3406 block diagram
        Figure2. M3406 Block Diagram

        Functional Description
        The M3406 is a high performance 600mA 1.5MHz monolithic step-down converter. The M3406 requires only three external power components (Cin, Cout and L). The adjustable version can be programmed with external feedback to any voltage, ranging from 0.6V to the input voltage.
        At dropout, the converter duty cycle increases to 100% and the output voltage tracks the input voltage minus the Rdson drop of the high-side MOSFET. The internal error amplifier and compensation provides excellent transient response, load, and line regulation. Soft start function prevents input inrush current and output overshoot during start up.
        APPLICATIONS INFORMATION
        Inductor Selection
        For most designs, the M3406 operates with inductors of 1µH to 4.7µH. Low inductance values are physically smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from the following equation:
        公式
        Where ΔI L is inductor Ripple Current.
        Large value inductors result in lower ripple current and small value inductors result in high ripple current. For optimum voltage-positioning load transients, choose an inductor with DC series resistance in the 50m。 to 150m。 range.
        Input Capacitor Selection
        The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency should be less than input source impedance to prevent high frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must be used. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. A 4.7µF ceramic capacitor for most applications is sufficient. A large value may be used for improved input voltage filtering.
        Output Capacitor Selection
        The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The output capacitor must have low impedance at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their low ESR and high ripple current ratings. The output ripple VOUT is determined by:
        公式
        A 10µF ceramic can satisfy most applications.
        PC Board Layout Checklist
        When laying out the printed circuit board, the following checking should be used to ensure proper operation of the M3406. Check the following in your layout:

        1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct and wide.
        2. Does the (+) plates of Cin connect to Vin as closely as possible. This capacitor provides the AC current to the internal power MOSFETs.
        3. Keep the switching node, SW, away from the sensitive VOUT node.
        4. Keep the (-) plates of Cin and Cout as close as possible

        Package Description

         

        package description
         
         
         
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