RT6219AGQW

® RT6219 4A, 23V, 500kHz, ACOTTM Synchronous Buck Converter General Description Features The RT6219 is a synchronous Buck converter with Advanced Constant On-Time (ACOTTM) mode control which  5V to 23V Input Voltage Range  provides a very fast transient response with no external compensators. The RT6219 operates from 5V to 23V input voltage, provides complete protection functions including Over Current Protection(OCP), Under Voltage Protection (UVP) and Over Voltage Protection (OVP). This IC also provides a 1.5ms internal soft-start function and an opendrain power good indicator.  Adjustable from 0.6V to 5V Output Range Up to 98% Duty for 2S Battery Application 500kHz Switching Frequency ACOTTM Mode Performs Fast Transient Response Integrated MOSFETs  67mΩ Ω of High-Side MOSFET  41mΩ Ω of Low-Side MOSFET Supports MLCC Output Capacitors Internal Soft-Start (1.5ms typ) Built-in OVP/UVP/OCP Power Good Indicator Thermal Shutdown      Ordering Information  RT6219   Package Type QW : WDFN-10L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) PWM Operation / VOUT Protection A : with DEM/Latch AH : with DEM/Hiccup BL : without DEM/Latch BH : without DEM/Hiccup Applications      Note :  Richtek products are :   Laptop Computers Tablet PCs Networking Systems Servers Personal Video Recorders Flat Panel Television and Monitors Distributed Power Systems RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Simplified Application Circuit BOOT VIN VIN CIN Enable L EN RBYP SW PGND VOUT R1 VBYP FB CBYP PGOOD VCC Copyright © 2018 Richtek Technology Corporation. All rights reserved. DS6219-06 January 2018 CB RT6219 CEN VSYS RB RPGOOD VCC COUT R2 CVCC is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT6219 Marking Information RT6219AGQW RT6219AHGQW 7S= : Product Code 6K= : Product Code 6K=YM DNN YMDNN : Date Code 7S=YM DNN RT6219BLGQW RT6219BHGQW 7Q= : Product Code 7Q=YM DNN YMDNN : Date Code 7R= : Product Code YMDNN : Date Code 7R=YM DNN YMDNN : Date Code Pin Configuration PGOOD VBYP VIN EN FB 1 2 3 4 5 PGND (TOP VIEW) 11 10 9 8 7 6 SW SW SW BOOT VCC WDFN-10L 3x3 Functional Pin Description Pin No. Pin Name Pin Function 1 PGOOD Open-drain power good indicator output. 2 VBYP Switch over input supply voltage for VCC. A low pass filter should be connected to AGND, if VBYP is applied. If VBYP is not used, then connect to AGND. Do not connect to VCC pin. 3 VIN Power input connect to high-side MOSFET drain. 4 EN Enable control input. Do not leave this pin floating. The slew rate of EN is recommended to be slower than 4.8V/s. 5 FB Feedback voltage input. 6 VCC 5V linear regulator output for internal control circuit. Bypass VCC to AGND with a 2.2F capacitor. VCC can only supply internal circuits. Do not connect to external loads. 7 BOOT Bootstrap supply for high-side gate driver. A capacitor is needed to drive the power switch's gate above the supply voltage. It is connected between the SW and BOOT pins to form a floating supply across the power switch driver. SW Switch node. PGND Power ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 8, 9, 10 11 (Exposed Pad) Copyright © 2018 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS6219-06 January 2018 RT6219 Functional Block Diagram VBYP VCC VCC POR & Reference Soft-Start FB VREF VFB VCC Switch-Over + + - VIN On-Time One shot Gate Control Logic Min off Time BOOT SW VCC EN PGND SW VOC 125% x VREF - + - OVP PGND Fault Logic + 91.5% x VREF PGOOD OCP + POK 58% x VREF + UVP VCC VIN VCC Regulator - Operation Overall OCP The RT6219 is a synchronous step-down converter with advanced constant on-time control mode. Using the ACOTTM control mode can reduce the output capacitance and provide fast transient response. It can minimize the component size without additional external compensation network. The inductor valley current is monitored cycle-by-cycle via the internal swiches, preventing an on-time until the current drops below the current limit. Power Good After soft-start is finished, the power good output goes high. The PGOOD pin is an open-drain output. Internal VCC Regulator The regulator provides 5V power to supply the internal control circuit. Connecting a 2.2μF ceramic capacitor for decoupling and stability is required. VCC Switch-Over Soft-Start Power Off In order to prevent the converter output voltage from overshooting during the startup period, the soft-start function is necessary. The soft-start time is internal setting and the duration is around 1.5ms. There is an internal discharging circuit to discharge the residual charge of output capacitor when converter is power off. Copyright © 2018 Richtek Technology Corporation. All rights reserved. DS6219-06 January 2018 The internal regulator output will switch over to VBYP if VBYP level is higher than 4.6V. is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT6219 Absolute Maximum Ratings              (Note 1) VIN to PGND -------------------------------------------------------------------------------------------------- −0.3V to 27V SW to PGND -------------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)