RT9059 3A, Ultra-Low Dropout Voltage Regulator General Description Features Output Current up to 3A The RT9059 is a high performance positive voltage regulator High Accuracy ADJ Voltage 1.5% designed for use in applications requiring very low input Dropout Voltage 350mV 3A Typically voltage and very low dropout voltage at up to 3A. It operates VOUT Power Good Signal with a VIN as low as 1V and VDD voltage 3V with VOUT Pull Low Resistance when Disable programmable output voltage as low as 0.8V. The RT9059 Current Limiting Protection features ultra low dropout, ideal for applications where Thermal Shutdown Protection VOUT is very close to VIN. Additionally, it has an enable RoHS Compliant and Halogen Free pin to further reduce power dissipation while shutdown. The RT9059 provides excellent regulation over variations Applications in line, load and temperature. The RT9059 provides a power good signal to indicate if the voltage level of V reaches O Notebook PC Applications 90% of its rating value. Motherboard Applications Ordering Information Pin Configurations RT9059(- ) (TOP VIEW) Package Type 8 GND PGOOD SP: SOP-8 (Exposed Pad-Option 1) 2 7 ADJ/NC EN QW : WDFN-10L 3x3 (W-Type) GND 3 6 VIN VOUT 9 4 5 NC Lead Plating System VDD G : Green (Halogen Free and Pb Free) SOP-8 (Exposed Pad) None : Adjustable Output Fixed Output Voltage Code 15 : 1.5V 18 : 1.8V VOUT 1 10 VDD 9 2 VOUT VIN 25 : 2.5V 3 8 VIN VOUT Note : 4 7 ADJ/NC VIN 5 11 6 EN PGOOD Richtek products are : RoHS compliant and compatible with the current require- WDFN-10L 3x3 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. DS9059-08 April 2014 www.richtek.com 1 GNDRT9059 Typical Application Circuit RT9059 RT9059 Chip Enable Chip Enable PGOOD PGOOD EN EN R VDD VDD PGOOD C VDD C VDD R VOUT PGOOD 1F 1F C OUT VIN VIN R1 10F C C IN IN VOUT ADJ 10F 10F C GND GND OUT R2 10F V = 0.8 x (R1+R2)/R2 OUT Figure 1. Adjustable Voltage Regulator Figure 2. Fixed Voltage Regulator Functional Pin Description Pin No. SOP-8 (Exposed Pad) WDFN-10L 3x3 Pin Name Pin Function Adjustable Fixed Output Adjustable Fixed Output Output Voltage Voltage Output Voltage Voltage 1 1 5 5 PGOOD Power Good Open Drain Output. 2 2 6 6 EN Enable Control Input. 3 3 7, 8. 9 7, 8. 9 VIN Supply Input Voltage. 4 4 10 10 VDD Supply Voltage of Control Circuit. 5 5, 7 -- 4 NC No Internal Connection. 6 6 1, 2, 3 1, 2, 3 VOUT Output Voltage. Output Voltage Setting. 7 -- 4 -- ADJ V = V x (R1+R2)/R2. OUT REF Ground. The exposed pad must be 8, 8, 11 11 soldered to a large PCB and GND 9 (Exposed Pad) 9 (Exposed Pad) (Exposed Pad) (Exposed Pad) connected to GND for maximum power dissipation. Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS9059-08 April 2014 2
