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RT9226 Dataheets PDF



Part Number RT9226
Manufacturers Richtek
Logo Richtek
Description PWM Step-down DC/DC Converter Controller
Datasheet RT9226 DatasheetRT9226 Datasheet (PDF)

RT9226 March, 2000 PWM Step-down DC/DC Converter Controller General Description Features The RT9226 is a low cost, high-efficiency voltage-mode PWM controller for motherboard power supply application. High-side N-channel MOSFET driver, short-circuit protection, and soft start function are integrated in a single chip. A simple high power buck regulator with shutdown function can be implemented with minimum external components. The RT9226 provides current-limit protection by monitoring the volt.

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RT9226 March, 2000 PWM Step-down DC/DC Converter Controller General Description Features The RT9226 is a low cost, high-efficiency voltage-mode PWM controller for motherboard power supply application. High-side N-channel MOSFET driver, short-circuit protection, and soft start function are integrated in a single chip. A simple high power buck regulator with shutdown function can be implemented with minimum external components. The RT9226 provides current-limit protection by monitoring the voltage drop across N-channel MOSFET in over current condition, therefore, eliminates the current sensing resistor and minimizes the efficiency loss. The soft start function reduces the stress on power supply and components in power on duration. The 200 kHz operating frequency and high speed PWM control loop with high-side N-channel MOSFET driver provide optimized compromise between efficiency, cost, and response speed. l Low cost and small size l High efficiency l Fast response with 200kHz operating frequency l Adjustable current limit by sensing MOSFET rDS(ON), without extra current sensing resistor l Shutdown function Applications l Low cost CPU power supply l Motherboard I/O power supply l Add-on card power supply Ordering Information RT9226-oo Pin Configurations Part Number Pin Configuration Package type S: SOP-14 Operation temperature range C: Commercial standard RT9226CS (Plastic SOP-14) TOP VIEW RT 1 14 VCC OCSET 2 13 NC SS 3 12 NC NC 4 11 NC FB 5 10 BOOT EN 6 9 UGATE GND 7 8 PHASE RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 1 / 6 -- DS9226-01 Tel: (8863)5510047 Fax: (8863)5537749 Absolute Maximum Ratings l Supply Voltage (VCC) l Input, Output or I/O Voltage l Ambient Temperature Range(TA) l Operating Junction Temperature Range (TJ) l Storage Temperature Range (TSTG) l Power Dissipation and Thermal Characteristics: l SOP Plastic Package, PD @ TA=25 l Thermal Resistance, R JA l Lead Temperature (Soldering) 10 seconds (TLEAD) Electrical Characteristics Vcc=12V, GND=0V, TA=25 , unless other wise specified. Parameter Symbol Test condition VCC Supply Current Nominal Supply Current Power-on Reset ICC UGATE Open VCC Rising Threshold VCC Falling Threshold Enable Input Threshold VOCSET = 4.5V VOCSET = 4.5V Oscillator Frequency Ramp Amplitude Internal Voltage Reference Reference Voltage VREF PWM Controller Error Amplifier DC Gain PWM Controller Gate Driver UGATE Source UGATE Sink Protection RUGATE RUGATE IUGATE = 0.3A IUGATE = 0.3A OCSET Sink Current SS Current IOCSET ISS VOCSET = 4.5V VSS = 1.5V RT9226 March, 2000 15V GND–0.3V to Vcc+0.3V 0 to 70 0 to 125 −65 to 150 0.625W 160 /W 260 Min Typ Max Units -- 3 -- mA -- 9.5 --- 7.5 -0.2 -- 2.2 V V V 170 200 230 kHz -- 1.9 -- -- 1.225 1.250 1.275 V -- 65 -- dB -- 8 --- 6 -- 170 200 230 -- 10 -- µA µA RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 2 / 6 -- DS9226-01 Tel: (8863)5510047 Fax: (8863)5537749 Function Block Diagram EN 10µA SS Soft Start 4.5V Power-on Reset _ + PWM Control + Comparator Logic Over Current Comparator Vref _+ + FB _ Error Amp Oscillator RT RT9226 March, 2000 VCC OCSET 200µA PHASE BOOT UGATE GND RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 3 / 6 -- DS9226-01 Tel: (8863)5510047 Fax: (8863)5537749 Pin Description Pin No. Pin Name 1 RT 2 OCSET 3 SS 4 NC 5 FB 6 EN 7 GND 8 PHASE 9 UGATE 10 BOOT 11 NC 12 NC 13 NC 14 VCC RT9226 March, 2000 Pin Function Oscillator frequency adjusting pin The switching frequency (f) is increased by placing a resistor (R) from this pin to GND and reduced by placing a resistor (R) to VCC according to following formulae: Speed up: f = 200(1+ 2 × 10 4 ) kHz R 1 Speed down: f = 200(1– ) kHz 6 × 10− 6 R Current limit set pin with 200µA current sink Soft start pin, connect a capacitor from this pin to GND No connected Voltage-control feedback loop input Regulator enable pin Ground pin Current limit sense pin MOSFET driver output Driver power No connected No connected No connected IC power RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 4 / 6 -- DS9226-01 Tel: (8863)5510047 Fax: (8863)5537749 Typical Applications RT9226 March, 2000 R1 C3 12V 10Ω C1 1µF D2 15V 10 1000 pF L1 BOOT 2 14 VCC OCSET R4 2.2k + 1µH C4 1 RT 9 1000µF x 2 6 EN UGATE CET6030L Q1 L2 38 C2 0.1µ F SS 5 FB PHASE 7 GND D1 7µ H C5 + 1000µF x 6 RT9226 R2 330 R3 200 VIN 5V V OUT 3.3V/10A C4, C5: Each 1000µF 6.3WV DC, Sanyo MV-GX or Equivalent. L1: Core: Micrometals T50-52; Winding: 5 turns of 18 AWG. L2: Core: Micrometals T60-52; Winding: 14 turns of 17 AWG. D1: BYV118 Q1: CET6030L RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 5 / 6 -- DS9226-01 Tel: (8863)5510047 Fax: (8863)5537749 Package Information RT9226 March, 2000 14 8.


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