RS8017 Dual Channel 1.5MHz, 1.2A, Synchronous Step-Down DC/DC Converter DESCRIPTION FEATURES The RS8017 dual-channel switch regulator is a 1.2A step-down converter with an input voltage range of 2.7V to 5.5V and an adjustable output voltage from 0.6V to VIN The 1.5MHz switching frequency enables the use of small external components. The small footprint and high efficiency make the RS8017 an ideal choice for portable applications. The RS8017 channel 1 or channel 2 delivers 1.2A maximum output current while consuming only 55μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the RS8017 an ideal choice for high output voltage, high current applications which require a low dropout threshold. Channel Output Current: Up to 1.2A Output Voltage: 0.6V to VIN Input Voltage: 2.7 to 5.5V Efficiency up to 95% 45μA No Load Quiescent current Shutdown Current: <1μA Internal Soft Start Thermal Shutdown Current Limit Protection No external Compensation Required 100% Duty Cycle Operation 1.5MHz Switching Frequency DFN-12L green package APPLICATIONS The RS8017 provides excellent transient response and high output accuracy across the operating range. No external compensation components are required. The RS8017 maintains high efficiency throughout the load range. The RS8017’s unique architecture produces reduced ripple and spectral noise. Over-temperature and short-circuit protection safeguard the RS8017 and system components from damage. DSC、DV、BT device ADXL、Mobil Phone Portable Media Players Handheld Computers BLOCK DIAGRAM VIN EN OSC & Shutdown Control Slope Compensation FB/VOUT Current Limit Detector Current Sense PWM Comparator Control Logic Driver LX Error Amplifier Current Source Controller UVLO& Power Good Detector Mux Current Detector VREF GND Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan RS8017 APPLICATION CIRCUIT L2 2.2μH VOUT2 COUT2 4.7μF VIN2 1 CIN2 2 VIN2 EN2 LX2 NC2 GND FB2 12 R21 850k 11 22pF 4.7μF 3 10 RS8017 R12 4 5 C11 22pF R11 850k 6 FB1 GND NC1 LX1 EN1 VIN1 C21 R22 9 8 7 CIN1 4.7μF VIN1 VOUT1 COUT1 4.7μF L1 2.2μH Figure : Adjustable Voltage Regulator V1.0 2 January 2014 RS8017 ORDER INFORMATION Device RS8017-X YY Z Device Code X is nominal output voltage designator : A : ADJ YY is package designator : DF: DFN-12 (3mm x 3mm) Z is Lead Free designator : P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package G : Green (Halogen Free with Commercial Standard) PIN ASSIGNMENTS DFN-12 PIN DESCRIPTION Symbol VIN2 LX2 GND FB1 NC1, NC2 EN1 VIN1 LX1 FB2 EN2 V1.0 Description Power Input of Channel 2. Pin for Switching of Channel 2. Ground. Exposed pad should be soldered to PCB board and connected to GND. Feedback of Channel 1. No Connection or Connect to VIN. Chip Enable of Channel 1. Power Input of Channel 1. Pin for Switching of Channel 1. Feedback of Channel 2. Chip Enable of Channel 2. Pin No. 1 2 3, 9, 13 4 5, 11 6 7 8 10 12 3 January 2014 RS8017 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 13 January 2014