RT9919GQW

RT9919 Functional Pin Description Pin No. Pin Name Pin Function 1 PVDD1 Power Input pin of CH1. 2 3 LX6 PVDD6 Switch Node of CH6. High impedance in shutdown. Power Input Pin of CH6. 4 5 CP CN Charge Pump External Driver Pin. Charge Pump External Driver Pin. 6 PNEG Negative Output Pin of Charge Pump. 7 FB6 Feedback Input Pin of CH6. High impedance in shutdown. 8 FB4 Feedback Input Pin of CH4. High impedance in shutdown. 9 EN6 Enable Pin of CH6. 10 LX4 Switch Node of CH4. High impedance in shutdown. 11 PVDD4 Power Input Pin of CH4. 12 13 EN5 SW5O Enable Pin of CH5. Output Pin of CH5 Load Disconnect. 14 15 SW5I FB5 Input Pin of CH5 Load Disconnect. Feedback Input Pin of CH5. High impedance in shutdown. 16 VREF 1.25V Reference Output Pin. 17 SEL Li or 2AA Select Pin. Logic state can not be changed during operation. 18 RTC_R RTC Reset Output Pin. 19 RTC_PWR Power Input Pin of RTC-Reset. 20 PVDD3 Power Input Pin of CH3 21 LX3 Switch Node of CH3. High impedance in shutdown. 22 EN7 Enable Pin of CH7. 23 FB3 Feedback Input Pin of CH3. High impedance in shutdown. 24 VOUT7 Sense Pin for CH7 Output Voltage. 25 LX5 Switch Node of CH5. High impedance in shutdown. 26 LX7 27, GND 41 (Exposed Pad) 28 CFB7 Switch Node of CH7. High impedance in shutdown. Ground Pin. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation. Feedback Input Pin of CH7. 29 VDDM IC analog Input Power Pin. 30 PVDD2 Power Input Pin of CH2. 31 LX2 Switch Node of CH2. High impedance in shutdown. 32 EN1234 Enable Pin of CH1, CH2, CH3 and CH4. 33 COMP2 Compensation Pin of CH2. 34 FB2 Feedback input pin of CH2. High impedance in shutdown. 35 VOUT1 Sense Pin for CH1 Output Voltage. High impedance in shutdown. 36 OK External Switch Control Pin. High impedance in shutdown. 37 FB1 Feedback Input Pin of CH1. High impedance in shutdown. 38 COMP1 Compensation Pin of CH1. Pull to GND in shutdown. 39 SYS_R System Reset Output Pin. 40 LX1 Switch Node of CH1. High impedance in shutdown. www.richtek.com 6 DS9919-01 April 2011 RT9919 Absolute Maximum Ratings z z (Note 1) Supply Voltage, VDDM ------------------------------------------------------------------------------ 0.3V to 7V Power Switch : LX1, LX2, LX4 ---------------------------------------------------------------------------------------- 0.3V to 6.5V LX5, LX7, SW5I, SW5O, VOUT7 ---------------------------------------------------------------- 0.3V to 21V LX6 ----------------------------------------------------------------------------------------------------- (PVDD6  14V) to (PVDD6 + 0.3V) z The Other Pins -------------------------------------------------------------------------------------- 0.3V to 6.5V z Power Dissipation, PD @ TA = 25qC WQFN 40L 5x5 -------------------------------------------------------------------------------------- 2.778W z Package Thermal Resistance (Note 2) WQFN 40L 5x5, TJA --------------------------------------------------------------------------------- 36qC/W z z z z WQFN 40L 5x5, TJC -------------------------------------------------------------------------------- 7qC/W Junction Temperature ------------------------------------------------------------------------------ 150qC Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------- 260qC Storage Temperature Range ---------------------------------------------------------------------- 65qC to 150qC ESD Susceptibility (Note 3) HBM (Human Body Mode) ------------------------------------------------------------------------ 2kV MM (Machine Mode) ------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 4) z Junction Temperature Range --------------------------------------------------------------------- 40qC to 125qC z Ambient Temperature Range --------------------------------------------------------------------- 40qC to 85qC Electrical Characteristics (VDDM = 3.3V, TA = 25 C, unless otherwise specified) Parameter Symbol T est Condition Min Typ Max Units Supply Voltage VDDM Operating Voltage V DDM 2.7 -- 5.5 V VDDM Minimum Startup Voltage VDDM Over Voltage Protection V ST 1.5 5.6 -6 -6.5 V V Supply Current Shutdown Supply Current into VDDM CH1 (Syn-Boost) : Supply Current into VDDM CH2 (Syn-Boost or Syn-Buck) : Supply Current into VD DM CH3 (Syn-Buck) : Supply Current into VDDM CH4 (Syn-Buck) : Supply Current into VDDM CH5 (Asyn-Boost) : Supply Current into VDDM CH6 (Invert ing) + Charge pump : Supply Current into VDDM CH7 (WLED): Supply Current into VDDM I OFF All EN = 0, CN = 3.3V -- 1 10 uA I Q1 Non Switching, EN1234 = 3.3V -- -- 800 uA I Q2 Non Switching, EN1234 = 3.3V -- -- 800 uA I Q3 Non Switching, EN1234 = 3.3V -- -- 800 uA I Q4 Non Switching, EN1234 = 3.3V -- -- 800 uA I Q5 Non Switching, EN5 = 3.3V -- -- 800 uA IQ6 Non Switching, EN6 = 3.3V PVDD 6 = 3.3V -- -- 800 uA IQ7 Non Switching, EN7 = 3.3V -- -- 800 uA To be continued www.richtek.com 8 DS9919-01 April 2011 RT9919 Parameter Oscillator CH1,2,3,4 Operating Frequency CH5, 6, 7 Operating Frequency Symbol Test Condition f OSC f OSC2 Min Typ Max Units 1800 900 2000 1000 2200 1100 kHz kHz CH1 Maximum Duty Cycle (Boost) CH2 Maximum Duty Cycle (Boost) VFB1 = 0.7V VFB2 = 0.7V 80 80 83 83 86 86 % % CH2 Maximum Duty Cycle (Buck) CH3 Maximum Duty Cycle (Buck) CH4 Maximum Duty Cycle (Buck) VFB2 = 0.7V VFB3 = 0.7V VFB4 = 0.7V ---- ---- 100 100 100 % % % CH5 Maximum Duty Cycle (Boost) CH6 Maximum Duty Cycle (Inverting) CH7 Maximum Duty Cycle (WLED) VFB5 = 1.15V VFB6 = 0.1V CFB 7 = 0.15V 91 91 91 94 94 94 97 97 97 % % % 0.788 0.8 0.812 V 1.237 1.25 1.263 V -15 0 15 mV 0.237 0.25 0.263 V 60 -- -- uA 1.237 1.25 1.263 V -- -- 10 mV 3.9 3.4 4.1 4 3.6 4.5 4.2 3.8 4.9 V V V P-MOSFET, PVDD 1 = 3.3V -- 150 -- m: N-MOSFET, PVDD1 = 3.3V -- 150 -- m: -- 3 -- A -- 150 -- m: -- 150 -- m: -- 1.5 -- A -- 3 -- A -- 200 -- m: N-MOSFET, PVDD3 = 3.3V -- 200 -- m: P-MOSFET, PVDD 4 = 3.3V --- 1.5 200 --- A m: N-MOSFET, PVDD4 = 3.3V -- 200 -- m: -- 1.5 -- A Feedback Regulation Voltage Feedback Regulation Voltage @ FB1, FB2, FB3, FB4 Feedback Regulation Voltage @ FB5 Feedback Regulation Voltage @ FB6 (Inverting) Feedback Regulation Voltage @ CFB7 OK Sink Current Reference VREF Output Voltage OK = 1V V REF VREF Load Regulation Negative Charge Pump 0uA < IREF < 200uA PVDD6 High Threshold to Stop Pump PVDD6 Low Threshold to Stop Pump (PVDD6  PNEG) Clamped Voltage PVDD6 = 3.3V Power Switch CH1 On Resistance of MOSFET RDS(ON) CH1 Current Limitation (Boost) CH2 On Resistance of MOSFET RDS(ON) P-MOSFET, PVDD 2 = 3.3V N-MOSFET, PVDD2 = 3.3V CH2 Current Limitation (Buck) CH2 Current Limitation (Boost) CH3 On Resistance of MOSFET R DS(ON) P-MOSFET, PVDD 3 = 3.3V CH3 Current Limitation (Buck) CH4 On Resistance of MOSFET R DS(ON) CH4 Current Limitation (Buck) CH5 Load Disconnect MOSFET P-MOSFET , SW5I = 3.3V -- 0.5 -- : CH5 On Resistance of MOSFET N-MOSFET -- 0.5 -- : CH5 Current Limitation N-MOSFET -- 1.2 -- A To be continued DS9919-01 April 2011 www.richtek.com 9 RT9919 Application information The RT9919 includes the following seven DC/DC converter channels to build a multiple-output power-supply system. CH1 : Step-up synchronous current modeDC/DC converter with internal power MOSFETs. The output voltage could be load disconnected by a switch controller and an external P-MOSFET. CH2 : Selectable step-up or step-down synchronous current mode DC/DC converter with internal power MOSFETs. CH2 : Selectable Step-Up or Step-Down Converter Step-up : The converter operates at fixed frequency PWM mode, continuous current mode (CCM), and discontinuous current m ode (DCM) with internal MOSFET and synchronous rectifier for up to 95% efficiency. Step-down : The converter operates at fixed frequency PWM mode and continuous current mode (CCM) with internal MOSFET and synchronous rectifier for up to 95% efficiency. CH3 : Step-down synchronous current mode DC/DC converter with internal power MOSFETs and internal compensation network. While the input voltage is close to the output voltage, the converter enters low dropout mode. The duty could be as long as 100% to extend battery life. CH4 : Step-down synchronous current mode DC/DC converter with internal power MOSFETs and internal CH3 : Step-Down DC/DC Converter compensation network. CH5 : Step-up asynchronous current mode DC/DC converter with internal power MOSFET and internal compensation network. The output voltage could be load The converter operates at fixed frequency PWM mode, CCM and integrated internal compensation. While the input voltage is close to the output voltage, the converter could enter low dropout mode with low output ripple. The duty could be as long as 100% to extend battery life. disconnected by an internal P-MOSFET. CH6 : Inverting current modeDC/DC converter with internal power MOSFET and internal compensation network. CH7 : Current mode WLED driver with internal power MOSFET and internal compensation network. This channel also provides open LED protection. CH4 : Step-Down DC/DC Converter The converter operates at fixed frequency PWM mode, CCM and integrated internal compensation. While the input voltage is close to the output voltage, the converter could enter low dropout mode with low output ripple. The duty could be as long as 100% to extend battery life. SW1 : Load disconnect controller. SW5 : Load disconnect switch for CH5 CH1 to CH4 operate in PWM mode with 2MHz and CH5 to CH7 operate in PWM mode with 1MHz constant frequency under moderate to heavy loading. RTC_LDO : Low quiescent current, high output voltage accuracy LDO for Real Time Clock. RTC_Reset : Accurate voltage detector for RTC LDO. System_Reset : Accurate voltage detector for power sequence. CH1 : Step-Up Converter Step-up : The converter operates at fixed frequency PWM mode, continuous current mode (CCM), and discontinuous current m ode (DCM) with internal MOSFET and synchronous rectifier for up to 95% efficiency. DS9919-01 April 2011 CH5 : Step-Up DC/DC Converter It integrates asynchronous boost with an internal MOSFET, internal compensation and an external schottky diode to provide CCD positive power supply. The converter is inactive until the SW5 soft start procedure is finished. This feature provides load disconnect function and effectively limits inrush current at start up. CH6 : INV DC/DC Controller This controller integrates an internal P-MOSFET and an external schottky diode to provide CCD negative power supply. The output voltage is set as VOUT = (R13/R14) x (VREF) where R13 and R14 are the feedback resisters connected to FB6, VREF equals to 1.25V in typical. www.richtek.com 17