RT6576AGQW Richtek

V OUT2 V OUT1 RT6576A/B Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs General Description Features Support Connected Standby Mode for Ultrabook The RT6576A/B is a dual-channel step-down controller CCRCOT Control with 100ns Load Step Response generating supply voltages for battery-powered systems. PWM Maximum Duty Ratio > 98% It includes two Pulse-Width Modulation (PWM) controllers 5V to 25V Input Voltage Range adjustable from 2V to 5.5V, and two fixed 5V/3.3V linear Dual Adjustable Output : regulators. Each linear regulator provides up to 100mA CH1 : 2V to 5.5V output current and 3.3V linear regulator provides 1% CH2 : 2V to 4V accuracy under 35mA. The RT6576A/B has an oscillator 5V/3.3V LDOs with 100mA Output Current output to drive the external charge pump application. Other 1% Accuracy on 3.3V LDO Output features include on-board power-up sequencing, a power- Oscillator Driving Output for Charge Pump good output, internal soft-start, and soft-discharge output Application that prevents negative voltage during shutdown. Internal Frequency Setting A constant current ripple PWM control scheme operates 300kHz/355kHz (CH1/CH2) without sense resistors and provides 100ns response to Internal Soft-Start and Soft-Discharge load transient. For maximizing power efficiency, the 4700ppm/C R Current Sensing DS(ON) RT6576A/B automatically switches to the diode-emulation Independent Switcher Enable Control mode in light load applications. The RT6576A/B is available Built-in OVP/UVP/OCP/OTP in the WQFN-20L 3x3 package. Non-Latch UVLO Power Good Indicator RoHS Compliant and Halogen Free Simplified Application Circuit V IN UGATE2 VIN RT6576A/B BOOT2 UGATE1 PHASE2 BOOT1 LGATE2 PHASE1 LGATE1 FB2 CS1 CS2 BYP1 LDO5 FB1 Channel 1 Enable EN1 PGOOD Channel 2 Enable EN2 LDO3 VCLK GND Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS6576A/B-02 January 2016 www.richtek.com 1 5V PGOOD Indicator 3.3VRT6576A/B Applications Marking Information RT6576AGQW Notebook and Sub-Notebook Computers 6V= : Product Code System Power Supplies YMDNN : Date Code 6V=YM 2-Cell to 4-Cell Li+ Battery-Powered Devices DNN Ordering Information RT6576A/B RT6576BGQW 6U= : Product Code Pin 1 Orientation*** YMDNN : Date Code (2) : Quadrant 2, Follow EIA-481-D 6U=YM DNN Package Type QW : WQFN-20L 3x3 (W-Type) Lead Plating System Pin Configurations G : Green (Halogen Free and Pb Free) (TOP VIEW) Pin Function With A : LDO3 Always On B : LDO3/LDO5 Always On Note : 20 19 18 17 16 1 15 CS1 LGATE1 ***Empty means Pin1 orientation is Quadrant 1 FB1 2 14 BYP1 Richtek products are : 3 13 LDO3 GND LDO5 FB2 4 21 12 VIN RoHS compliant and compatible with the current require- CS2 5 11 LGATE2 ments of IPC/JEDEC J-STD-020. 6 7 8 9 10 Suitable for use in SnPb or Pb-free soldering processes. WQFN-20L 3x3 Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS6576A/B-02 January 2016 2 EN2 EN1 PGOOD VCLK PHASE2 PHASE1 BOOT2 BOOT1 UGATE2 UGATE1