SD6410 SHOUDING | Alldatasheet

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Technical content

The SD6410 is offered in a low profile (1mm) as low as 0.6V. The SD6410 can also run at 1.5A output currents. The SD6410 can The SD6410 are high-efficiency, high SD6410

FEATURES

  • High Efficiency: Up to 96%
  • 1.4MHz Constant Frequency Operation
  • 1500mA 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: 35µA
  • 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 Typical Application

Figure 1. Basic Application Circuit to minimize the conduction loss. extending battery life in portable system. the wider range of the load.

SD6410 1.4MHz Absolute Maximum Ratings (Note 1) Input Supply Voltage ……… -0.3V to 6V Operating Temperature Range … -40° C to +85° C SW Voltage ……………-0.3V to (Vin+0.3V) Storage Temperature Range ..…-65° C to 150° C Peak SW Sink and Source Current 2.5A Lead Temperature(Soldering,10s) ….…..+300° C Package/Order Information Part Number SWICHING FREQUENCY Temp Range OUTPUT VOLTAGE (V) OUTPUT CURRENT (A) -40° C to +85° C ADJ 1.5 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

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 10µF 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. SD6410 1.4MHz, 1.5A Synchronous Step-Down Converter Shouding http://www.shouding.net

Electrical Characteristics (Note 3) (VIN=V RUN =3.6V, VOUT =1.8V, TA = 25° C, unless otherwise noted.) Parameter Conditions MIN TYP MAX unit Input Voltage Range 2.3 5.5 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 0.1 300 1.0 µA µA µA µA TA = 25° C 0.588 0.600 0.612 V TA = 0° C ≤ TA ≤ 85° C 0.586 0.600 0.613 V Regulated Feedback Voltage TA = -40° C ≤ TA ≤ 85° C 0.585 0.600 0.615 V Reference Voltage Line Regulation Vin=2.5V to 5.5V 0.04 0.40 %/V Output Voltage Line Regulation VIN = 2.5V to 5.5V 0.04 0.4 % Output Voltage Load Regulation 0.5 %

1.5 MHz

Oscillation Frequency Vout=100% Vout=0V 300 KHz On Resistance of PMOS I SW =100mA 0.13 0.2 Ω ON Resistance of NMOS I SW =-100mA 0.1 0.2 Ω Peak Current Limit V IN= 3V, Vout=90% 2.5 A RUN Threshold 0.30 1.0 1.50 V RUN Leakage Current ±0.01 ±1.0 µA SW Leakage Current V RUN =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 SD6410 1.4MHz, 1.5A Synchronous Step-Down Converter Shouding http://www.shouding.net

Typical Performance Characteristics Effi-1.8Vout 65.00 70.00 75.00 80.00 85.00 90.00 95.00 0.9 1.4 9.7 49.4 99. 299.8 499. 749.1 999.0 120 1.1 1301.1 2.7V 3.6 4.2 5.0 Effi--3.3V output 70.00 75.00 80.00 85.00 90.00 95.00 100.00 3.8 4.2 load VS output 3.2050 3.2100 3.2150 3.2200 3.2250 0 .9 52 740 1.4 43 580 9 .59032 0 4 9.45 93 99.87 80 300.8 18 90 0 500 .8 1510 0 750 .1 3820 0 1 000.03 30 1 20 2. 14 80 00 1 30 2. 13 90 00 3.8 4.2 TEMPERATURE (C) FREQUENCY (MHz) Oscillator Frequency vs Temperature -48 -32 -16 0 16 32 48 64 80 96 1.200 1.300 1.400 1.500 1.600 1.700 1.800 Iout=50mA Vout=1.8V VOUT 10mV/DIV 400ns/DIV SW 5V/DIV IL 500mA/DIV Vin=3.6V PFM MODE SD6410 1.4MHz, 1.5A Synchronous Step-Down Converter Shouding http://www.shouding.net

Figure 2. SD6410 Block Diagram ranging from 0.6V to the input voltage. drop of the high-side MOSFET. and output overshoot during start up.

proper operation of the SD6410. Check the For most designs, the SD6410 operates with APPLICATIONS INFORMATION Inductor Selection 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: OSCLIN OUTINOUT fIV VVVL ×Δ × −×= Where LIΔ 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 Ω to 150mΩ range. Input Capacitor Selection With the maximum load current at 1.5A, the maximum ripple current through input capacitor is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greater than 10uF capacitance can handle this ripple current well. To minimize the potential noise problem, place this ceramic capacitor really close to the IN and GND pins. Care should be taken to minimize the loop area formed by CIN, and IN/GND pins. 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: −×≤Δ 38 1)( CfESRLfV VVVV oscOSCIN OUTINOUT OUT 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 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 SD6410 1.4MHz, 1.5A Synchronous Step-Down Converter Shouding http://www.shouding.net

1.4MHz, 1.5A Synchronous Step-Down Converter Shouding http://www.shouding.net