TPMP1470GJ-Z

TPMP147 0GJ -Z 18V 2 A 6 00KH z Syncharonous Step-Dow n Converter www.sot23.com.tw    PU  Distributed Power Systems Digital Set Top Boxes Flat Panel Television and Monitors Wireless and DSL Modems Notebook Computer TE CH        High Efficiency: Up to 95%max 600KHz Frequency Operation 2.0A Output Current No Schottky Diode Required 3.5V to 18V Input Voltage Range 0.8V Reference Slope Compensated Current Mode Control for Excellent Line and Load Transient Response Integrated internal compensation Stable with Low ESR Ceramic Output Capacitors Over Current Protection with Hiccup-Mode Input over voltage protection(OVP) Thermal Shutdown Inrush Current Limit and Soft Start Available in SOT23-6 Package -40°C to +85°C Temperature Range IC    BL The TPMP1470 is a fully integrated,high– efficiency 2.0A synchronous rectified step-down converter. The TPMP1470 operates at high efficiency over a wide output current load range. 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 TPMP1470 requires a minimum number of readily available standard external components and is available in a 6-pin SOT23 ROHS compliant package.       PIN CONFIGURATION PIN NAME FUNCTION 1 GND 2 LX Switching Pin 3 IN Power supply Pin 4 FB Adjustable version feedback input. Connect FB to the center point of the external resistor divider. 5 EN Drive this pin to a logic-high to enable the IC. Drive to a logic-low to disable the IC and enter micro-power shutdown mode. BS Bootstrap. A capacitor connected between LX and BST pins is required to form a floating supply across the high-side switch driver. Ground 1 6 TPMP147 0GJ -Z 18V 2 A 6 00KH z Syncharonous Step-Dow n Converter www.sot23.com.tw LI C TYPICAL APPLICATION Figure 1. Basic Application Circuit UB Setting the Output Voltage R1 Vout / VFB  1 TE R2  CH P The external resistor divider is used to set the output voltage (see Typical Application on page 1). The feedback resistor R1 also sets the feedback loop bandwidth with the internal compensation capacitor. Choose R1 to be around 10kΩ for optimal transient response. R2 is then given by: Use a T-type network for when VOUT is low. 2 Vout R1(KΩ) 5.0V 3.3V 2.5V 1.8V 1.2V 1.05V 40.2 40.2 40.2 40.2 20.5 10 R2(KΩ) RT(KΩ) 7.68 13 19.1 32.4 41.2 32.4 75 75 100 120 249 300 TPMP147 0GJ -Z 18V 2 A 6 00KH z Syncharonous Step-Dow n Converter www.sot23.com.tw Absolute Maximum Rating ( TA=25°C Parameter unless otherwise noted) Symbol Input Supply Voltage,EN LX Voltage FB Voltage BS Voltage Pink Current limit Junction Temperature Operating Temperature Storage Temperature Range Lead Temperature Power Dissipation Vcc VLX V Max. Unit -0.3 -0.3 -0.3 -0.6 20 20 6.0 25 3 155 +85 150 300 600 135 60 V V V V A °C °C °C °C mW °C/W °C/W I peak IC -40 -65 PD QJA QJC BL Thermal Resistance ( TA=25°C unless otherwise noted) PU Electrical Characteristics Min. ( VIN=12V ,VOUT=5V , TA = 25°C, unless otherwise noted.) MIN TYP 3.5 18.5 3.0 TE Input Voltage Range OVP Threshold UVLO Threshold Supply Current in Operation Supply Current in Shutdown Regulated Feedback Voltage High-Side Switch On-Resistance Low-Side Switch On-Resistance High-Side Switch Leakage Current Upper Switch Current Limit Oscillation Frequency Maximum Duty Cycle Minimum On-Time Thermal Shutdown Conditions CH Parameter VEN=2.0V, VFB=1.1V 0.4 VEN =0 or EN = GND 1 TA = 25°C, 3.5V≤VIN ≤18V 0.784 VEN=0V, VLX=0V Minimum Duty Cycle 0.8 unit 18 19.5 V V V 0.6 mA uA 0.816 V 120 mΩ 70 mΩ 0 2.5 10 uA A 600 95 60 160 VFB=0.8V MAX KHz % nS ℃ WWW.TECHPUBLIC.COM.TW 3 TPMP147 0GJ -Z 18V 2 A 6 00KH z Syncharonous Step-Dow n Converter www.sot23.com.tw TE CH PU BL IC BLOCK DIAGRAM 4 TPMP147 0GJ -Z 18V 2 A 6 00KH z Syncharonous Step-Dow n Converter www.sot23.com.tw Package informantion TE CH PU BL IC SOT23-6 SYMBOL MILLIMETERS INCHES MIN MAX MIN MAX A 1.050 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e e1 L 0.950TYP 1.800 0.037TYP 2.000 0.071 0.700REF L1 0.300 θ 0° 0.079 0.028REF 0.600 0.012 0.024 8° 0° 8° 5