RT9227A

RT9227A RICHTEK | Alldatasheet

Document overview

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Technical content

Features

z 3-in-one Regulated Voltages for Microprocessor Core, Clock, and GTL z Compatible with HIP6016 z Power-good Output Voltage Monitor Switching section z 5-bit DAC Programmable from 1.3V to 3.5V z ±±±±1% DAC Accuracy z Fast Transient Response z Full 0% to 100% Duty Cycle Driver z Fixed 200kHz Switching Frequency z Adaptive Non-overlapping Gate Driver z Over-current Monitor Uses MOSFET RDS(ON) z Over-voltage Protection Uses Lower MOSFET Linear Section z Fixed Linear Regulator Output Voltage z MOSFET or NPN Driving Capability z Ultra Fast Response Speed z Under-voltage Protection z Internal Thermal Shutdown

Applications

z Full Motherboard Power Regulation for Computer z Low-voltage Distributed Power Supplies Pin Configurations Part Number Pin Configurations RT9227ACS (Plastic SOP-24) TOP VIEW Operating temperature range C: Commercial standard Package type S : SOP-24 VID4 VID3 VID2 VID1 VID0 PGOOD FAULT SS NC UGATE1 PHASE1 LGATE1 PGND OCSET1 VSEN1 FB1 NC FB3 GATE3 VCC VIN2 FB2 GND VOT2 12 13

www.richtek-ic.com.tw DS9227A-02 July 2001 Absolute Maximum Ratings z Supply Voltage +15V z PGOOD and GATE Voltage GND −0.3V to VCC+0.3V z Input, Output or I/O Voltage GND − 0.3V to 7V z Ambient Temperature Range 0 °C to +70°C z Junction Temperature Range 0 °C to +125°C z Storage Temperature Range -65 °C to +150°C z Lead Temperature (Soldering, 10 sec.) 300 °C z Package Thermal Resistance SOP-24,θJA 75°C/W Recommended Operating Conditions z Supply Voltage +12V±10% z Ambient Temperature Range 0 °C to 70°C z Junction Temperature Range 0 °C to 125 °C CAUTION: Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

Electrical Characteristics

(VCC = 12V, PGND = 0V, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units VCC Supply Current Nominal Supply Current ICC UGATE1, GATE3, LGATE1, and VOUT2 Open -- 10 -- mA Power-On Reset VCC Rising Threshold VOCSET1 = 4.5V 7.5 -- 9.5 V VCC Falling Threshold VOCSET1 = 4.5V 7- -9V Rising VIN2 Under-Voltage Threshold -- -- 2.8 V VIN2 Under-Voltage Hysteresis -- 0.5 -- V Rising VOCSET1 Threshold -- 1.25 -- V Oscillator Free Running Frequency 180 200 225 KHz Ramp Amplitude ∆VOSC -- 1.9 -- VP-P Reference and DAC DAC (VID0 – VID4) Input Low Voltage -- -- 0.8 V DAC (VID0 – VID4) Input High Voltage 2.0 -- -- V DACOUT Voltage Accuracy DACOUT = 2.05 ~ 3.50V -1 -- 1 % DACOUT Voltage Accuracy DACOUT = 1.30 ~ 2.00V -1% -- 20mV -- To be continued

DS9227A-02 July 2001 www.richtek-ic.com.tw Parameter Symbol Test Conditions Min Typ Max Units Linear Regulator Regulation Voltage VREG 10mA < IVOUT2 < 150mA 2.437 2.500 2.563 V Under-Voltage Level FB2 Rising -- 1.875 2.175 V Under-Voltage Hysteresis -- 100 -- mV Over-Current Protection 180 230 -- mA Over-Current Protection During Start-Up -- 700 -- mA Linear Controller Regulation Voltage VREG VSEN3 = GATE3 0 < IGATE3 < 20mA 1.462 1.500 1.538 V Under-Voltage Level FB3 Rising -- 1.125 1.305 V Under-Voltage Hysteresis -- 100 -- mV PWM Controller Error Amplifier DC Gain -- 65 -- dB PWM Controller Gate Driver UGATE Source RUGATE1 VCC = 12V VCC - VUGATE1 = 1V -- 3 7 Ω UGATE Sink RUGATE1 VUGATE1 = 1V -- 3 7 Ω LGATE Source ILGATE1 VCC = 12V, VLGATE1 = 2V -- 1 -- A LGATE Sink RLGATE1 VLGATE1 = 1V -- 2 6 Ω Protection VOUT1 Over-Voltage Trip VSEN1 Rising 112 115 120 % FAULT Souring Current VFAULT = 8V 10 14 -- mA OCSET1 Current Source IOCSET VOCSET1 = 4.5V 170 200 230 µA Soft-Start Current ISS VSS = 1V -- 11 -- µA Power Good VOUT1 Upper Threshold VSEN1 Rising 108 -- 112 % VOUT1 Under Voltage VSEN1 Rising 89 -- 95 % VOUT1 Hysteresis (VSEN1 / DACOUT) Upper/Lower Threshold -- 2 -- % PGOOD Voltage Low VPGOOD IPGOOD = -4mA -- -- 0.5 V

www.richtek-ic.com.tw DS9227A-02 July 2001 Function Block Diagram Functional Pin Description VCC (Pin 1) Provide a 12V bias supply for the IC to this pin. This pin also provides the gate bias charge for all the MOSFETs controlled by the IC. VID0, VID1, VID2, VID3, VID4 (Pin 6, 5, 4, 3, and 2) VIDO-4 are the input pins to the 5-bit DAC. The states of these five pins program the internal voltage reference, DACOUT. The level of DACOUT sets the core converter output voltage. It also sets the core PGOOD and OVP thresholds. Table 1 specifies the DACOUT voltage of 32 combinations of VID levels. PGOOD (Pin 7) PGOOD is an open collector output used to indicate the status of the output voltage. This pin is pulled low when the core output is not within ±10% of the DACOUT reference voltage and the other outputs are below their under-voltage thresholds. The PGOOD output is open for ‘11111’ VID codes that inhibit operation. See table 1. FAULT (Pin 8) This pin is low during normal operation, but it is pulled to about 8V (V CC = 12V) in the event of an over-voltage or over-current condition. SS (Pin 9) Connect a capacitor from this pin to ground. This capacitor, along with an internal 11 µA (V SS >1V) current source, sets the soft-start interval of the converter. 110% 90% 115% POWER-ON RESET (POR) SOFT-START & FAULT LOGIC TTL D/A CONVERTER (DAC) OSCILLATOR GATE CONTROL LOGIC LINEAR UNDER VOLTAGE PGOOD PHASE1 LGATE1 PGND GND VCC VSEN3 FAULT VID0 VID1 VID2 VID3 SS 3.3V OCSET1VSEN1 COMPENSATION GATE3 0.3V 3.3V VIN2 1.26V VOUT2 FB2 OC2 0.25A VCC 11µA VID4 DACOUT ERROR AMP LUV OC1 FB1 PWM INHIBIT PWM COMP LOWER DRIVE VCC VCC UPPER DRIVE UGATE1 200µA +_ +

DS9227A-02 July 2001 www.richtek-ic.com.tw FB2 (Pin 11) Connect this pin to V OUT2 to set the linear regulator output voltage. VIN2 (Pin 12) This pin supplies power to the internal regulator. Connect this pin to a suitable 3.3V source. Additionally, this pin is used to monitor the 3.3V supply. If, following a startup cycle, the voltage drops below 2.55V (typically), the chip shuts down. A new soft-start cycle is initiated upon return of the 3.3V supply above the under-voltage threshold. VOUT2 (Pin 13) Output of the linear regulator. Supplies current up to 230mA. GND (Pin 14) Signal ground for the IC. All voltage levels are measured with respect to this pin. GATE3 (Pin 15) Connect this pin to the gate of an external MOSFET or the base of an NPN. This pin provides the drive for the linear controller’s pass transistor. FB3 (Pin 16) Connect this pin to V OUT3 to set the linear controller output voltage. FB (Pin 18) The FB1 pin is the inverting input of the error amplifier. VSEN1 (Pin 19) This pin is connected to the PWM converter’s output voltage. The PGOOD and OVP comparator circuits use this signal to report output voltage status and for over voltage protection. OCSET1 (Pin 20) Connect a resistor (R OCSET1) from this pin to the drain of the upper MOSFET. R OCSET1, an internal 200µA current source (I OCSET1), and the upper MOSFET on-resistance (RDS(ON)) set the PWM converter over-current (OC) trip point according to the following equation: IOCSET1×ROCSET1IPEAK = RDS(ON) PGND (Pin 21) This is the power ground of UGATE1 and LGATE1. Tie the PWM converter’s lower MOSFET source to this pin. LGATE1 (Pin 22) Connect LGATE1 to the PWM converter’s lower MOSFET gate. This pin provides the gate drive for the lower MOSFET. An over-current trip cycles the soft-start function. Sustaining an over-current for 2 soft-start intervals shuts down the controller. PHASE1 (Pin 23) Connect the PHASE1 pin to the PWM converter’s upper MOSFET source. This pin is used to monitor the voltage drop across the upper MOSFET for over- current protection. UGATE1 (Pin 24) Connect UGATE pin to the PWM converter’s upper MOSFET gate. This pin provides the gate drive for the upper MOSFET.

Table 1. VOUT1 Voltage Program

11111 I N H I B I T

DS9227A-02 July 2001 www.richtek-ic.com.tw Typical Application Circuit 1µH 3.5µH 1000pF 1.21k SS FAULT FB1 VSEN1 PGND LGATE1 PHASE1 UGATE1 PGOOD OCSET1 VCC VIN2 GATE3 FB3 VOUT2 FB2 OCSET1 VID0 VID1 VID2 VID3 VID4 GND POWERGOOD C5-6 2x1µF C20 1µF C1-4 4x1000µF 1000µF RFD3055 1000µF C10 270µF V OUT3 1.5V V OUT2 2.5V 3.3V GND 12V C12 0.039µF 732K C11 0.68µF PHB83N03LT PHB95N03LT Q2 R4 4.99K C13-19 7x1000µF 10K V OUT1 1.3 to 3.5VRT9227A 15A

www.richtek-ic.com.tw DS9227A-02 July 2001

Package Information

Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 15.189 15.596 0.598 0.614 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 M H B J B A C IFD

DS9227A-02 July 2001 www.richtek-ic.com.tw

www.richtek-ic.com.tw DS9227A-02 July 2001 RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw