LC2332H 1MHz, 18V, 2A Synchronous Step-Down Converter DESCRIPTION FEATURES High Efficiency: Up to 96% The LC2332H is a fully integrated, high-efficiency 2A 1MHz Frequency Operation synchronous rectified step-down converter. The 2A Output Current LC2332H operates at high efficiency over a wide No Schottky Diode Required output current load range. 4.2V to 18V Input Voltage Range 0.8V Reference This device offers two operation modes, PWM Slope Compensated Current Mode Control for control and PFM Mode switching control, which Excellent Line and Load Transient Response allows a high efficiency over the wider range of the Integrated internal compensation load. Stable with Low ESR Ceramic Output Capacitors The LC2332H requires a minimum number of Over Current Protection with Hiccup-Mode readily available standard external components and Thermal Shutdown is available in a 6-pin SOT23 ROHS compliant Inrush Current Limit and Soft Start package. Available in SOT23-6 -40C to +85C Temperature Range APPLICATIONS Distributed Power Systems Digital Set Top Boxes Flat Panel Television and Monitors Wireless and DSL Modems Notebook Computer TYPICAL APPLICATION C3 C3 VIN 1uF VIN 1uF L L 4.7uH 4.7uH VIN BST VOUT VIN BST VOUT 3.3V/2A 3.3V/2A Ren Ren C1 C1 SW SW 100k 100k 10uF C4 8.2pF 10uF R1 EN LC2332H EN LC2332H 300k R3 10k R1 C2 C2 FB FB 22uF 22uF 121k GND GND R2 R2 39.2k 96k Figure 2. Figure 1. Note: 1) C1 and C2 recommended using 10uF, 22uF ceramic capacitors. If the electrolytic capacitor is used, it is recommended that the ceramic capacitor in parallel with a capacitance value of 0.1uF or more. 2) The resistance R3 in Figure 1 makes the loop more stable. If it isn t used, the resistance R1R2 should be adjusted(See Figure2.). The value of R1 is recommended to be about 300k. 3) C3 can be valued as 1uF, 0.1uF. www.leadchip.com 1 Your final power solution LC2332H ORDERING INFORMATION BST EN FB Mark Explanation Ordering Information 6 5 4 Product ID LC2332HCB6TR SOT23-6 Package GM: Product Code YW: Date code (Year & Week) 1 2 3 Devices per reel 3000 GND SW VIN ABSOLUTE MAXIMUM RATING Parameter Value Supply Voltage V -0.3V to 19V IN Switch Node Voltage V -0.3V to (V +0.5V) SW IN Boost Voltage V V -0.3V to V +5V BST SW SW Enable Voltage V -0.3V to 19V EN All Other Pins -0.3V to 6V Operating Temperature Range -40 C to 85C Storage Temperature Range -65C to 150C Lead Temperature (Soldering, 10s) 300C ELECTRICAL CHARACTERISTICS (V =12V, V =5V, T =25C, unless otherwise stated) IN OUT A Parameter Conditions Min Typ Max Unit Input Voltage Range 4.2 18 V UVLO Threshold 4.1 V Supply Current in Operation V = 2.0V, V = 1.1V 0.5 mA EN FB Supply Current in Shutdown V = 0V or V = GND 5 10 uA EN EN Regulated Feedback Voltage 4.2VV 18V 0.784 0.8 0.816 V IN High-side Switch On Resistance V = 5V 150 m BST-SW Low-side Switch On Resistance V = 5V 70 m IN High-side Switch Leakage Current V = 0V, V = 0V 0 10 uA EN SW Upper Switch Current Limit Minimum Duty Cycle 3.8 A Oscillation Frequency 1 MHz Maximum Duty Cycle V = 0.7V 92 % FB Minimum On Time 100 ns EN Input Voltage H 1.5 V EN Input Voltage L 0.6 V Thermal Shutdown 160 C PIN DESCRIPTION PIN NAME DESCRIPTION 1 GND Ground 2 SW Switching Pin 3 VIN Power supply Pin Adjustable version feedback input. Connect FB to the center point of the external resistor 4 FB divider. Drive this pin to a logic-high to enable the IC. Drive to a logic-low to disable the IC and 5 EN enter micro-power shutdown mode. Boostrap. A capacitor connected between SW and BST pins is required to form a floating 6 BST supply across the high-side switch driver. www.leadchip.com 2 Your final power solution GMYW