RT9041E-10GQW Richtek

RT9041E Supply 500mA, Low Voltage, LDO Regulator with External Bias General Description Features 2% Output Voltage Accuracy The RT9041E is a low voltage, low dropout linear regulator No Minimum Load Current Required with an external bias supply input. The bias supply drives 1V to 5.5V Input Supply Voltage the gate of the internal N-MOSFET pass transistor, making 3V to 5.5V Input Bias Supply Voltage these devices ideal for applications that require low voltage PGOOD Open-Drain Output outputs from low voltage inputs. The RT9041E provides Supports Fixed/Adjustable Output Voltage fixed output voltage from 1V to 2V with 0.1V increments. Low Supply Current Adjustable output voltage is available for the RT9041E by 5A (max) Shutdown Supply Current using external resistors. Other features include current RoHS Compliant and Halogen Free limit and thermal shutdown to protect regulator from fault conditions. Applications The RT9041E is available in a WDFN-8L 2x2 package. Set Top Box Notebook Computers Ordering Information RT9041E- VID Power Supplies PDAs Package Type Cell Phones QW : WDFN-8L 2x2 Low Dropout Regulators with External Bias Supply Lead Plating System G : Green (Halogen Free and Pb Free) Pin Configurations Output Voltage 10 : 1.0V/Adj (TOP VIEW) 11 : 1.1V/Adj : 1 8 VOUT VIN 19 : 1.9V/Adj 2 7 ADJ NC 3 6 PGOOD VDD 20 : 2.0V/Adj 9 4 5 GND EN Note : Richtek products are : WDFN-8L 2x2 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. Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS9041E-03 November 2014 www.richtek.com 1 GNDRT9041E Typical Application Circuit RT9041E V 8 IN 1 VIN VOUT V 1V to 5.5V OUT C IN C OUT R1 10F 10F 2 ADJ R2 V 6 DD VDD 3.3V to 5.5V C VDD 0.1F 3 Chip Enable PGOOD 5 EN R3 GND 100k 4, Exposed pad (9) Function Pin Description Pin No. Pin Name Pin Function 1 VOUT Output Voltage. Output Voltage Adjust Pin. Set the output voltage by the internal feedback 2 ADJ resistors when ADJ is ground. If external feedback resistors is used, V = V x (R1 + R2)/R2. OUT REF 3 PGOOD Power Good Open Drain Output. Ground. The exposed pad must be soldered to a large PCB and connected to 4, 9 (Exposed pad) GND GND for maximum power dissipation. 5 EN Chip Enable (Active-High). 6 VDD Supply Voltage of Control Circuitry. 7 NC No Internal Connection. 8 VIN Supply Input Voltage. Function Block Diagram VIN VOUT OCP Driver OTP V IN Error Amplifier ADJ EN UVLO Mode 0.8V VDD PGOOD - + 0.7V GND Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS9041E-03 November 2014 2 + -