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RT8249D Dataheets PDF



Part Number RT8249D
Manufacturers Richtek
Logo Richtek
Description Dual-Channel Synchronous DC/DC Step-Down Controller
Datasheet RT8249D DatasheetRT8249D Datasheet (PDF)

® RT8249D Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs General Description The RT8249D is a dual-channel step-down, controller generating supply voltages for battery-powered systems. It includes two Pulse-Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and two fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current and 3.3V linear regulator provides 1% accuracy under 35mA. The RT8249D provides a mode selection pin, SKIP.

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® RT8249D Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs General Description The RT8249D is a dual-channel step-down, controller generating supply voltages for battery-powered systems. It includes two Pulse-Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and two fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current and 3.3V linear regulator provides 1% accuracy under 35mA. The RT8249D provides a mode selection pin, SKIPSEL, to select Diode-Emulation Mode (DEM) or Audio Skipping Mode (ASM). Other features include on-board power-up sequencing, a power-good output, internal soft-start, and soft-discharge output that prevents negative voltage during shutdown. A constant current ripple PWM control scheme operates without sense resistors and provides 100ns response to load transient. For maximizing power efficiency, the RT8249D automatically switches to the diode-emulation mode in light load applications. The RT8249D is available in the WQFN-20L 3x3 package. Features  Support Connected Standby Mode for Ultrabook  CCRCOT Control with 100ns Load Step Response  PWM Maximum Duty Ratio > 98%  5V to 25V Input Voltage Range  Dual Adjustable Output :  CH1 : 2V to 5.5V  CH2 : 2V to 4V  5V/3.3V LDOs with 100mA Output Current  1% Accuracy on 3.3V LDO Output  Oscillator Driving Output for Charge Pump Application  Internal Frequency Setting  500kHz/600kHz (CH1/CH2)  Internal Soft-Start and Soft-Discharge  4700ppm/°C RDS(ON) Current Sensing  Independent Switcher Enable Control  Built in OVP/UVP/OCP/OTP  Non-latch UVLO  Power Good Indicator  20-Lead WQFN Package  RoHS Compliant and Halogen Free Simplified Application Circuit VIN VOUT1 VIN UGATE2 RT8249D BOOT2 UGATE1 BOOT1 PHASE2 LGATE2 PHASE1 LGATE1 FB2 CS1 BYP1 CS2 FB1 Channel 1 Enable EN1 Channel 2 Enable On Off EN2 LDO5 PGOOD LDO3 GND VOUT2 5V PGOOD Indicator 3.3V Copyright ©2016 Richtek Technology Corporation. All rights reserved. DS8249D-00 May 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT8249D Applications  Notebook and Sub-Notebook Computers  System Power Supplies  3-Cell and 4-Cell Li+ Battery-Powered Devices Pin Configurations (TOP VIEW) EN1 SKIPSEL PHASE1 BOOT1 UGATE1 Ordering Information RT8249D Pin 1 Orientation*** (2) : Quadrant 2, Follow EIA-481-D Package Type QW : WQFN-20L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : ***Empty means Pin1 orientation is Quadrant 1 Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. CS1 FB1 LDO3 FB2 CS2 20 19 18 17 16 1 15 LGATE1 2 14 BYP1 3 GND 13 LDO5 4 21 12 VIN 5 11 LGATE2 6 7 8 9 10 EN2 PGOOD PHASE2 BOOT2 UGATE2 WQFN-20L 3x3 Marking Information RT8249DGQW 9N=YM DNN 9N= : Product Code YMDNN : Date Code Functional Pin Description Pin No. 1 2 3 4 5 6 Pin Name CS1 FB1 LDO3 FB2 CS2 EN2 Pin Function Current Limit Setting. Connect a resistor to GND to set the threshold for Channel 1 synchronous RDS(ON) sense. The GND  PHASE1 current limit threshold is 1/8th the voltage seen at CS1 over a 0.2V to 2V range. There is an internal 50A current source from LDO5 to CS1. Feedback Voltage Input for Channel 1. Connect FB1 to a resistive voltage divider from VOUT1 to GND to adjust output from 2V to 5.5V. 3.3V Linear Regulator Output. It is always on when VIN is higher than VINPOR threshold. Feedback Voltage Input for Channel 2. Connect FB2 to a resistive voltage divider from VOUT2 to GND to adjust output from 2V to 4V. Current Limit Setting. Connect a resistor to GND to set the threshold for Channel 2 synchronous RDS(ON) sense. The GND  PHASE2 current limit threshold is 1/8th the voltage seen at CS2 over a 0.2V to 2V range. There is an internal 50A current source from LDO5 to CS2. Enable Control Input for Channel 2. 7 PGOOD Power Good Indicator Output for Channel 1 and Channel 2. (Logical AND) Switch Node of Channel 2 MOSFETs. PHASE2 is the internal lower supply rail for 8 PHASE2 the UGATE2 high-side gate driver. PHASE2 is also the current-sense input for the Channel 2. 9 BOOT2 Bootstrap Supply for Channel 2 High-Side Gate Driver. Connect to an external capacitor according to the typical application circuits. 10 UGATE2 High-Side Gate Driver Output for Channel 2. UGATE2 swings between PHASE2 and BOOT2. Copyright ©2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS8249D-00 May 2016 RT8249D Pin No. 11 12 13 14 15 16 17 Pin Name LGATE2 VIN LDO5 BYP1 LGATE1 UGATE1 BOOT1 18 PHASE1 19 SKIPSEL 20 EN1 21 (Exposed Pad) GND Pin Function Low-Side Gate Driver Output for Channel 2. LGATE2 swings between GND and LDO5. Power Input for 5V and 3.3V LDO Regulators and Buck Controllers. 5V Linear Regulator Output. LDO5 is a.


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