RT2857BHGQW Richtek

RT2857B 6A, 18V, Synchronous Step-Down Converter General Description Features Low R Power MOSFET Switches 26m/19m DS(ON) The RT2857B is a high efficiency, monolithic synchronous Input Voltage Range : 4.5V to 18V step-down DC/DC converter that can deliver up to 6A output Adjustable Switching Frequency : 200kHz to 1.6MHz current from a 4.5V to 18V input supply. The RT2857B Current-Mode Control current-mode architecture with external compensation Synchronous to External Clock : 200kHz to 1.6MHz allows the transient response to be optimized over a wide Accurate Voltage Reference 0.6V 1%, Over 40C range of loads and output capacitors. Cycle-by-cycle to 85C current limit provides protection against shorted outputs Monotonic Start-Up into Pre-biased Outputs and soft-start eliminates input current surge during start- Adjustable Soft-Start up. Fault condition protections include output under-voltage Power Good Indicator protection, output over-voltage protection, and over- Selectable Hiccup Mode and Latch-Off Mode temperature protection. The low current shutdown mode Under-Voltage Protection provides output disconnection, enabling easy power Over-Temperature and Over-Voltage Protection management in battery-powered systems. Input Under-Voltage Lockout RoHS Compliant and Halogen Free Applications High Performance Point of Load Regulation Notebook Computers High Density and Distributed Power Systems Simplified Application Circuit RT2857B BOOT V VIN IN C IN C BOOT L PVIN LX V OUT R1 Enable EN FB C PGOOD OUT PGOOD R COMP1 R OSC COMP R2 RT/SYNC C C COMP1 COMP2 C SS SS/TR GND Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS2857B-01 March 2014 www.richtek.com 1RT2857B Ordering Information Marking Information RT2857BHGQW RT2857B 04= : Product Code Package Type YMDNN : Date Code QW : WQFN-14AL 3.5x3.5 (W-Type) 04=YM DNN Lead Plating System G : Green (Halogen Free and Pb Free) UVP Trim Option RT2857BLGQW H : Hiccup 03= : Product Code L : Latch-Off YMDNN : Date Code 03=YM Note : DNN Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Pin Configurations (TOP VIEW) 1 14 GND 2 13 BOOT GND 3 12 LX 4 11 PVIN GND LX PVIN 5 10 EN 15 6 9 VIN SS/TR 7 8 WQFN-14AL 3.5x3.5 Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS2857B-01 March 2014 2 FB RT/SYNC COMP PGOOD