PDF RT9911 Data sheet ( Hoja de datos )

Número de pieza	RT9911
Descripción	6 Channel DC/DC Converters
Fabricantes	Richtek Technology Corporation
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No Preview Available ! RT9911 6 Channel DC/DC Converters with a Linear Controller General Description The RT9911 is a complete power-supply solution for digital still cameras and other hand-held devices. It integrates one selectable Boost/Buck DC-DC converter, one high- efficiency step-down DC-DC converter, one high-efficiency main step-up converter, one PWM converter for CCD www.DataShpeoesti4tUiv.ecovmoltage, one inverter for CCD negative voltage and one white LEDdriver for LCD backlight and a linear controller that drives an external P-Channel MOSFET for a linear regulator. The RT9911 is targeted for applications that use either two or three primary cells or a single lithium-ion battery. RT9911 is available in VQFN-40L6x6. Each DC-DC converter has independent shutdown input. Ordering Information RT9911 Package Type QV : VQFN-40L 6x6 (V-Type) Note : Operating Temperature Range P : Pb Free with Commercial Standard RichTek Pb-free 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. `100% matte tin (Sn) plating. Pin Configurations (TOP VIEW) Features z 1.6V to 5.5V Battery Input Voltage Range z Synchronous Boost/Buck Selectable DC-DC Converter `Internal Switches `Up to 95% efficiency z Syn-Buck DC-DC Converters `0.8V to 5.5V Adjustable Output Voltage `Up to 95% efficiency `100%(MAX) Duty Cycle `Internal Switches z Main Boost DC-DC Converter `Adjustable Output Voltage `Up to 97% efficiency z PWM Converter for CCD positive voltage z Inverter for CCD negative voltage z White LED Driver for LCD panel backlight z Up to 1.4MHz Adjustable Switching Frequency z 1μA Supply Current in Shutdown mode z External compensation network for all converters z Independent enable pin to shutdown each channel. z 40-Lead VQFN Package z RoHS Compliant and 100% Lead (Pb)-Free Applications z Digital Still Camera z PDA z Protable Device 40 39 38 37 36 35 34 33 32 31 LFB 1 30 LX2 OK2 2 29 PGND2 RT 3 28 FB3 VREF 4 27 COMP3 VDDM 5 GND 6 GND 26 CS3 25 DRN3 FB1 7 24 DRP3 COMP1 8 23 VFB6 PGND1 9 22 CFB6 LX1 10 21 COMP6 11 12 13 14 15 16 17 18 19 20 VQFN-40L 6x6 DS9911-00 February 2006 www.richtek.com 1 1 page RT9911 Pin No. Pin Name Pin Function I/O 18 EXT4 External Power Switch of CH4. OUT Internal State at I/O Configuration Shut Down PVDD5 Pull Low EXT4 www.DataSheet41U9.com EXT6 External Power Switch of CH6. OUT Pull Low PVDD5 EXT6 20 PVDD3 Power Input Pin of CH3. IN 24 DRP3 External PMOS Switch Pin for CH3. OUT 21 COMP6 Feedback Compensation Pin of CH6. 22 CFB6 Current Feedback Input Pin for CH6. OUT IN 23 VFB6 Voltage Feedback Input Pin for CH6. IN -- Pull High PVDD3 DRP3 Pull Low 0.2V + COMP6 CFB6 - High Impedance VFB6 1.0V High Impedance 50uA + - 25 DRN3 External NMOS Switch Pin for CH3. OUT Pull Low PVDD3 DRN3 VDDM 26 CS3 Current Sense Input Pin for CH3 IN High Impedance CS3 DS9911-00 February 2006 To be continued www.richtek.com 5 5 Page RT9911 Parameter Symbol Test Conditions Power Switch CH5 On Resistance of MOSFET CH6 On Resistance of MOSFET RDS(ON)P5 P-MOSFET, PVDD5 = 3.3V RDS(ON)N5 N-MOSFET, PVDD5 = 3.3V RDS(ON)P6 P-MOSFET, PVDD5 = 3.3V RDS(ON)N6 N-MOSFET, PVDD5 = 3.3V Linear Controller Linear Controller Feedback Regulation www.DataShVeoetl4taUg.ceom VLFB OK2 pin Sink Current OK2 = 1V External Current Setting (CH3) CS3 Sourcing Current VFB6 Sink Current Protection Under Voltage Protection Threshold Voltage @ FB1, FB2 Over Voltage Protection @ FB1, FB2 ICS3 IVFB6 SELECT = 0V SELECT = 0V Control EN1, EN2, EN3, EN4, EN5, EN6 Input High Level Threshold EN1, EN2, EN3, EN4, EN5, EN6 Input Low Level Threshold EN1, EN2, EN3, EN4, EN5, EN6 Sink Current Select Pin Input High Level Threshold Select Pin Input Low Level Threshold Select Pin Sink Current ISELECT Thermal Protection Thermal Shutdown Thermal Shutdown Hysteresis TSD ΔTSD VDDM = 3.3V VDDM = 3.3V VDDM = 3.3V Min Typ Max Units -- 6 15 Ω -- 6 15 Ω -- 6 15 Ω -- 6 15 Ω 0.788 0.8 0.812 V 90 -- -- uA 5 10 15 uA 40 50 60 uA 0.3 0.4 0.5 -- 1 -- V V -- -- 1.3 V 0.4 -- -- V -- 2 6 uA -- -- 1.3 V 0.4 -- -- V -- 2 6 uA 125 180 -- 20 -- -- °C °C Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 5. A Schottky retifier connected from LX1 to PVDD1 is required for low-voltage startup, refer to Figure 1. DS9911-00 February 2006 www.richtek.com 11 11 Page

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