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RT8230B Dataheets PDF



Part Number RT8230B
Manufacturers RICHTEK
Logo RICHTEK
Description Dual-Channel Synchronous DC/DC Step-Down Controller
Datasheet RT8230B DatasheetRT8230B Datasheet (PDF)

® RT8230A/B/C/D/E Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs General Description The RT8230A/B/C/D/E 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. The 5V linear regulator supplies power to the PWM drivers. The RT8230A/B/C/D/E includes .

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® RT8230A/B/C/D/E Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs General Description The RT8230A/B/C/D/E 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. The 5V linear regulator supplies power to the PWM drivers. The RT8230A/B/C/D/E includes 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. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, the diodeemulation mode maximizes efficiency for light load applications. The RT8230A/B/C/D/E is available in the WQFN-20L 3x3 package. Features  Maximum Duty Up to 96%  CCRCOT Control with 100ns Load Step Response  Wide Input Voltage Range : 5V to 25V  Dual Adjustable Output :  CH1 : 2V to 5.5V  CH2 : 2V to 4V  Fixed 3.3V and 5V LDO Output : 100mA  1% Accuracy on 3.3V LDO Output  Frequency Adjustable Via TON Setting  4700ppm/ °C RDS(ON) Current Sensing  Adjustable Current Limit Combined with Enable Control  Internal Soft-Start and Soft-Discharge  Thermal Shutdown  RoHS Compliant and Halogen Free Applications  Notebook and Sub-Notebook Computers  2-Cell, 3-Cell and 4-Cell Li+ Battery-Powered Devices Simplified Application Circuit VOUT1 VIN ENLDO/ENC VIN RT8230A/B/C/D/E VIN UGATE2 ENLDO/ENC BOOT2 PHASE2 UGATE1 * BOOT1 LGATE2 FB2 PHASE1 ENTRIP2 LGATE1 ENTRIP1 * VIN RTON FB1 TON LDO3 3.3V VOUT2 ENM/SECFB * : optional BYP1 ENM/SECFB GND LDO5 PGOOD 5V PGOOD Copyright ©2014 Richtek Technology Corporation. All rights reserved. DS8230A/B/C/D/E-04 February 2014 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT8230A/B/C/D/E Ordering Information RT8230A/B/C/D/E Package Type QW : WQFN-20L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Pin Function With A : ENM+ENLDO B/D : SECFB+ENLDO C/E : SECFB+ENC 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) BYP1 BOOT1 UGATE1 PHASE1 LGATE1 FB1 ENTRIP1 TON ENTRIP2 FB2 20 19 18 17 16 1 15 LDO3 2 14 LDO5 3 GND 13 ENM 4 21 12 ENLDO 5 11 VIN 6 7 8 9 10 PGOOD BOOT2 UGATE2 PHASE2 LGATE2 RT8230A BYP1 BOOT1 UGATE1 PHASE1 LGATE1 Marking Information RT8230AGQW 2F= : Product Code 2F=YM DNN YMDNN : Date Code FB1 ENTRIP1 TON ENTRIP2 FB2 20 19 18 17 16 1 15 LDO3 2 14 LDO5 3 GND 13 SECFB 4 21 12 ENLDO 5 11 VIN 6 7 8 9 10 PGOOD BOOT2 UGATE2 PHASE2 LGATE2 RT8230BGQW 2E=YM DNN 2E= : Product Code YMDNN : Date Code RT8230CGQW 2D=YM DNN 2D= : Product Code YMDNN : Date Code RT8230DGQW 3C=YM DNN 3C= : Product Code YMDNN : Date Code RT8230EGQW 3D=YM DNN 3D= : Product Code YMDNN : Date Code RT8230B/D BYP1 BOOT1 UGATE1 PHASE1 LGATE1 FB1 ENTRIP1 TON ENTRIP2 FB2 20 19 18 17 16 1 15 LDO3 2 14 LDO5 3 GND 13 SECFB 4 21 12 ENC 5 11 VIN 6 7 8 9 10 PGOOD BOOT2 UGATE2 PHASE2 LGATE2 RT8230C/E WQFN-20L 3x3 Copyright ©2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS8230A/B/C/D/E-04 February 2014 RT8230A/B/C/D/E Functional Pin Description Pin No. Pin Name Pin Function 1 FB1 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. 2 ENTRIP1 Enable and Current Limit Setting for Channel 1. There is an internal 5A current source to the ENTRIP1 pin. Connect a resistor to GND to set the threshold between 0.2V and 3V for channel 1 current limit. The GND  PHASE1 current limit threshold is 1/10th the voltage on the ENTRIP1 pin. 3 TON Switching Frequency Setting. Connect a resistor to GND to adjust switching frequency. 4 ENTRIP2 Enable and Current Limit Setting for Channel 2. There is an internal 5A current source to the ENTRIP2 pin. Connect a resistor to GND to set the threshold between 0.2V and 3V for channel 2 current limit. The GND  PHASE2 current limit threshold is 1/10th the voltage on the ENTRIP2 pin. 5 FB2 Feedback Voltage Input for Channel 2. Connect FB2 to a resistive voltage-divider from VOUT2 to GND to adjust output from 2V to 4V. 6 PGOOD Power Good Output for Channel 1 and Channel 2. (Logical AND) 7 BOOT2 Bootstrap Supply for Channel 2 High-Side Gate Driver. Connect to an external capacitor according to the typical application circuits. 8 UGATE2 Gate Drive Output for Channel 2 High-Side MOSFET. 9 P.


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