RT9224E Preliminary Function Block Diagram VCC VSEN 110% Power-On Reset (POR) + 90% PGOOD + - 115% + Over Voltage OVP Soft Start + OCSET - Over Current Reference VID0 VID1 VID2 VID3 VID25 TTL D/A Converter (DAC) DACOUT Error Amplifier + - SS BOOT UGATE 4.5V 200uA 10uA PWM Comparator + - FB Oscillator Inhibit PHASE Gate Control Logic PWM LGATE PGND GND DS9224E-02 March 2004 www.richtek.com 3 RT9224E Preliminary Functional Pin Description Pin No. Pin Name 1 VSEN Pin Function Output Voltage Monitoring Input for OVP and PGOOD Over current set pin, sinks 200µA through a resistor (ROCS) from this upper N-MOSFET to set the trip point: 2 OCSET IPEAK = 200uA × ROCS MOSFET - on resistance An over-current trip cycles the soft-start function 3 SS Soft start speed is set by internal 10µA current source and capacitor from this pin to GND 4 VID25 Switching regulator output voltage setting 5 VID0 Switching regulator output voltage setting 6 VID1 Switching regulator output voltage setting 7 VID2 Switching regulator output voltage setting 8 VID3 Switching regulator output voltage setting 9,20 NC No connection 10 FB Feedback input pin 11 GND IC signal ground 12 PGOOD Open drain logic output This pin is pulled low when the converter output is not within ±10% of the DACOUT reference voltage 13 PHASE Current limit sense input 14 UGATE High side driver output 15 BOOT Driver power 16 PGND Low-side driver GND 17 LGATE Low side driver output 18 VCC Power supply input 19 OVP Over voltage protection This pin is pulled high when the VSEN voltage is over 15% of the DACOUT reference voltage www.richtek.com 4 DS9224E-02 March 2004 RT9224E Preliminary Table 1 Output Voltage Program Pin Name Nominal Output Voltage DACOUT VID25 VID3 VID2 VID1 VID0 0 0 1 0 0 1.050V 1 0 1 0 0 1.075V 0 0 0 1 1 1.100V 1 0 0 1 1 1.125V 0 0 0 1 0 1.150V 1 0 0 1 0 1.175V 0 0 0 0 1 1.200V 1 0 0 0 1 1.225V 0 0 0 0 0 1.250V 1 0 0 0 0 1.275V 0 1 1 1 1 1.300V 1 1 1 1 1 1.325V 0 1 1 1 0 1.350V 1 1 1 1 0 1.375V 0 1 1 0 1 1.400V 1 1 1 0 1 1.425V 0 1 1 0 0 1.450V 1 1 1 0 0 1.475V 0 1 0 1 1 1.500V 1 1 0 1 1 1.525V 0 1 0 1 0 1.550V 1 1 0 1 0 1.575V 0 1 0 0 1 1.600V 1 1 0 0 1 1.625V 0 1 0 0 0 1.650V 1 1 0 0 0 1.675V 0 0 1 1 1 1.700V 1 0 1 1 1 1.725V 0 0 1 1 0 1.750V 1 0 1 1 0 1.775V 0 0 1 0 1 1.800V 1 0 1 0 1 1.825V Note: (1) 0:Connected to GND (2) 1:Open DS9224E-02 March 2004 www.richtek.com 5 RT9224E Preliminary Absolute Maximum Ratings Supply Voltage ------------------------------------------------------------------------------------------------------ +15V Boot Voltage --------------------------------------------------------------------------------------------------------- +15V Input, Output or I/O Voltage -------------------------------------------------------------------------------------- GND -0.3V to VCC + 0.3V Storage Temperature Range -------------------------------------------------------------------------------------- −65° C to150°C Package Thermal Resistance SOP-20, θJA -------------------------------------------------------------------------------------------------------------------------------------------------------- 87° C/W Recommended Operating Conditions Supply Voltage ------------------------------------------------------------------------------------------------------- +12V ±10% Ambient Temperature Range -------------------------------------------------------------------------------------- 0° C to 70°C Junction Temperature Range -------------------------------------------------------------------------------------- 0° C to 125°C Electrical Characteristics (TA = 25° C, recommended operating conditions, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units UGATE and LGATE -- 3 -- mA VCC Rising Threshold VOCSET = 4.5V -- 9.5 -- V VCC Falling Threshold VOCSET = 4.5V -- 7.5 -- V -- 1.6 -- V 170 200 230 kHz -- 1.9 -- VP-P DAC (VID0-VID25) Input Low Voltage -- -- 0.8 V DAC (VID0-VID25) Input High Voltage 2.0 -- -- V DACOUT Voltage Accuracy -1.0 -- +1.0 % -- 65 -- dB VCC Supply Current Nominal Supply ICC Power-on Reset Rising VOCSET Threshold Oscillator Free Running Frequency Ramp Amplitude ∆VOSC Reference and DAC Error Amplifier DC Gain Gate Drivers UGATE Source RUGATE VBOOT – VPHASE = 12V -- 8 -- Ω UGATE Sink RUGATE VUGATE – VPHASE = 1V -- 5 -- Ω LGATE Source ILGATE VCC = 12V, VLGATE = 6V -- 500 -- mA LGATE Sink RLGATE VLGATE = 1V -- 5 -- Ω To be continued www.richtek.com 6 DS9224E-02 March 2004 RT9224E Preliminary Parameter Symbol Test Conditions Min Typ Max Units -- 115 120 % Protection Over-voltage Trip (VSEN/DACOUT) OCSET Current Source IOCSET VOCSET = 4.5V 167 200 233 µA OVP Sourcing Current IOVP VSEN = 5.5V, VOVP = 0V 60 -- -- mA Soft-Start Current ISS VSS = 1.5V -- 10 -- µA Power Good Upper Threshold (VSEN/DACOUT) VSEN Rising 106 -- 114 % Lower Threshold (VSEN/DACOUT) VSEN Falling 89 -- 96 % Hysteresis (VSEN/DACOUT) Upper and Lower Threshold -- 2 -- % -- 0.5 -- V PGOOD Voltage Low DS9224E-02 March 2004 VPGOOD ICPGOOD = -5mA www.richtek.com 7 RT9224E Preliminary Outline Dimension H A M J B F C I D Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 12.598 13.005 0.496 0.512 B 7.391 7.595 0.291 0.299 C 2.362 2.642 0.093 0.104 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.229 0.330 0.009 0.013 I 0.102 0.305 0.004 0.012 J 10.008 10.643 0.394 0.419 M 0.381 1.270 0.015 0.050 20–Lead SOP Plastic Package RICHTEK TECHNOLOGY CORP. RICHTEK TECHNOLOGY CORP. Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)89191466 Fax: (8862)89191465 Email: [email protected] www.richtek.com 8 DS9224E-02 March 2004