APW7015 Advanced PWM and Dual Linear Power Control Features • General Description The APW7015 integrates a PWM controller and Dual linear controller, as well as the monitoring and protection functions into a single package, which provides three controlled power outputs with over-voltage and over-current protections. The PWM controller regulates the DDR reference voltage with a synchronous-rectified buck converter. The linear controller regulates power for microprocessor core voltage and Memory Voltage. 3 Regulated Voltage are provided • Switching Power for VTT(1.25V) • Linear1 Regulator for FBVDDQ(2.5V) • Linear2 Regulator for NVVDD(2.05V) • Simple Single-Loop Control Design • Voltage-Mode PWM Control • Excellent Output Voltage Regulation TTL Compatible 3-bit digital-to-analog converter (DAC) that adjusts the output voltage from 1.3VDC to 1.65VDC in 0.05V steps is included in APW7015. The precision reference and voltage-mode PWM control provide ±2% static regulation. The linear controller drives an external N-channel MOSFET to provide adjustable voltage. • PWM Output: ±2% Full Temperature • Linear Output: ±3% Full Temperature • Fast Transient Response • High-Bandwidth Error Amplifier • Full 0% to 100% Duty Ratio • The APW7015 monitors all the output voltages, and a single Power Good signal is issued when the PWM Voltage is within 10% of the DAC setting and the other output levels are above their under-voltage thresholds. Additional built-in over-voltage protection for the PWM output uses the lower MOSFET to prevent output voltages above 115% of the DAC setting. The PWM over-current function monitors the output current by using the voltage drop across the upper MOSFET’s RDS(ON) ,eliminating the need for a current sensing resistor. TTL-Compatible 3-Bit Digital-to-Analog Output Voltage Selection • 0.05V Steps from 1.3VDC to 1.65VDC • Power-Good Output Voltage Monitor • Over-Voltage and Over-Current Fault • Monitors Small Converter Size • Constant Frequency Operation(200kHz) • Programmable Oscillator from 50kHz to Pin Description 1MHz • Reduce External Component Count Applications • Motherboard Power Regulation for Computers • Low-Voltage Distributed Power Supplies • VGA Card Power Regulation VCC 1 24 UGATE DRIVE2 2 23 PHASE NC 3 22 LGATE NC 4 21 PGND VID2 5 20 OCSET VID1 6 19 VSEN1 VID0 7 18 FB PGOOD 8 17 COMP VSEN2 9 16 VSEN3 SS 10 15 DRIVE3 FAULT 11 14 GND NC 12 13 VAUX ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2001 1 www.anpec.com.tw APW7015 Ordering Information APW7015 Package Code K : SOP - 24 Temp. Range C : 0 to 70 °C Handling Code TU : Tube Handling Code Temp. Range Package Code TR : Tape & Reel Block Diagram VSEN1 VSEN3 OCSET VCC VAUX Power-on Reset (POR) × 1.10 + - DRIVE3 + × 0.90 × 0.75 1.26V INHIBIT VSEN2 DRIVE2 - - + + FAULT PGOOD - LINEAR UNDERVOLTAGE - VAUX + LUV + 200µA + - × 1.15 + - VCC OV SOFT START & FAULT LOGIC DRIVER1 UGATE OC1 + - PHASE INHIBIT + ERROR AMP1 - + 1.5V VCC - PWM COMP1 28µA VCC PWM1 TTL D/A CONVERTER (DAC) DACOUT OSCILLATOR GATE CONTROL + - LGATE SYNCH DRIVE PGND GND 4.5V SS FAULT FB COMP VID0 VID1 VID2 Absolute Maximum Ratings Symbol VCC VI , VO Parameter Supply Voltage Input , Output or I/O Voltage Rating Unit 15 V GND -0.3 V to VCC +0.3 V TA Operating Ambient Temperature Range 0 to 70 °C TJ Junction Temperature Range 0 to 125 °C TSTG Storage Temperature Range -65 to +150 °C 300 ,10 seconds °C TS Soldering Temperature Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 2 www.anpec.com.tw APW7015 Thermal Characteristics Symbol R θJA Parameter Thermal Resistance in Free Air SOIC SOIC (with 3in2 of Copper) Value Unit 75 65 °C/W Electrical Characteristics (Recommended operating conditions, Unless otherwise noted) Refer to Block and Simplified Power System Diagrams, and Typical Application Schematic APW7015 Symbol Parameter Test Conditions Min. Typ. Max. Unit VCC Supply Current ICC Nominal Supply Current UGATE, LGATE, DRIVE2, DRIVE3 open 9 mA Power-on Reset Rising VCC Threshold Vocset=4.5V 10.4 8.2 V Falling VCC Threshold Vocset=4.5V Rising VAUX Threshold Vocset=4.5V 2.5 V VAUX Threshold Hysteresis Vocset=4.5V 0.5 V 1.26 V Rising VOCSET Threshold V Oscillator FOCS ∆VOSC Free Running Frequency RT= Open Ramp Amplitude RT= Open DAC and Bandgap Reference DAC(VID0-VID2) Input Low Voltage DAC(VID0-VID2) Input High Voltage DACOUT Voltage accuracy VBG 185 200 215 1.9 VP-P 0.8 2.0 +2.0 1.265 Bandgap Reference Tolerance V V -2.0 Bandgap Reference Voltage kHz -2.5 % V +2.5 % Linear Regulators (OUT2, OUT3) Regulation (All Linears) Output Drive Current (All Liners) VAUX-VDRIVE >0.6V 20 3 % 40 mA 88 dB 15 MHz 6 V/µs Synchronous PWM Controller Error Amplifier DC Gain GBWP Gain-Bandwidth Product SR Slew Rate Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 COMP=10pF 3 www.anpec.com.tw APW7015 Electrical Characteristics Cont. APW7015 Symbol Parameter PWM Controller Gate Driver IUGATE UGATE Source Test Conditions VCC=12V, VUGATE =6V RUGATE UGATE Sink VUGATE1-PHASE =1V ILGATE LGATE Source VCC=12V, VLGATE =1V RLGATE LGATE Sink VLGATE= 1V Protection VSEN1 Over-Voltage (VSEN1/DACOUT) IOVP FAULT Souring Current IOCSET ISS OCSET Current Source Min. 115 VFAULT/RT=2.0V 8.5 170 200 Unit A 3.5 Ω A 3 Ω 120 % 1 VSEN1 Rising VOCSET= 4.5VDC Max. 1 Soft Start Current Power Good VSEN1 Upper Threshold (VSEN1/DACOUT) VSEN1 Under Voltage (VSEN1/DACOUT) VSEN1 Hysteresis (VSEN1 /DACOUT) VPGOOD PGOOD Voltage Low Typ. mA 230 µA µA 28 VSEN1 Rising 108 110 % VSEN1 Rising 92 94 % Upper /Lower Threshold IPGOOD= -4mA 2 % 0.8 V Functional Pin Description of DACOUT sets the VTT converter output voltage, as well as the corresponding PGOOD and OVP thresholds. 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. The voltage at this pin is monitored for Power-On Reset (POR) purposes. PGOOD (Pin 8) PGOOD is an open collector output used to indicate the status of the output voltages. This pin is pulled low when the synchronous regulator output is not DRIVE2 (Pin 2) Connect this pin to the gate of an external MOSFET. This pin provides the drive for the NVVDD regulator’s pass transistor. within ±10% of the DACOUT reference voltage or when any of the other outputs are below their undervoltage thresholds. VID2, VID1, VID0 (Pins 5, 6 and 7) VSEN2 (Pin 9) VID0-2 are the TTL-compatible input pins to the 3-bit DAC. The logic states of these three pins program the internal voltage reference (DACOUT). The level Connect this pin to a resistor divider to set the linear regulator (NVVDD) output voltage. Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 4 www.anpec.com.tw APW7015 Functional Pin Description (Cont.) SS (Pin 10) COMP and FB (Pin 17, and 18) Connect a capacitor from this pin to ground. This capacitor, along with an internal 28mA current source, sets the soft-start interval of the converter. COMP and FB are the available external pins of the PWM converter error amplifier. The FB pin is the inverting input of the error amplifier. Similarly, the COMP pin is the error amplifier output. These pins are used to compensate the voltage-mode control feedback loop of the synchronous PWM converter. FAULT (Pin 11) This pin provides oscillator switching frequency adjustment. By placing a resistor (RT) from this pin to GND, the nominal 200kHz switching frequency is increased according to the following equation: Fs =200kHz + 5 ´ 10 6 / RT (kW) 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. (RT to GND) Conversely, connecting a resistor from this pin to VCC reduces the switching frequency according to the following equation: Fs =200kHz + 4 ´ 10 7 / RT (kW) OCSET (Pin 20) Connect a resistor from this pin to the drain of the respective upper MOSFET. This resistor, an internal 200µA current source, and the upper MOSFET’s onresistance set the converter over-current trip point. An over-current trip cycles the soft-start function. The voltage at this pin is monitored for power-on reset (POR) purposes and pulling this pin low with an open drain device will shutdown the IC. (RT to 12V) Nominally, the voltage at this pin is 1.26V. In the event of an over-voltage or over-current condition, this pin is internally pulled to VCC. VAUX (Pin 13) This pin provides boost current for the linear regulator’s output drives in the event bipolar NPN transistors (instead of N-channel MOSFETs) are employed as pass elements. The voltage at this pin is monitored for power-on reset purposes. PGND (Pin 21) GND (Pin 14) LGATE (Pin 22) Signal ground for the IC. All voltage levels are measured with respect to this pin. Connect LGATE to the PWM converter’s lower MOSFET gate. This pin provides the gate drive for the lower MOSFET. This is the power ground connection. Tie the synchronous PWM converter’s lower MOSFET source to this pin. DRIVE3 (Pin 15) PHASE (Pin 23) Connect this pin to the gate of an external MOSFET. This pin provides the drive for the FBVDDQ regulator’s pass transistor. Connect the PHASE pin to the PWM converter’s upper MOSFET source. This pin represents the gate drive return current path and is used to monitor the voltage drop across the upper MOSFET for over-current protection. VSEN3 (Pin 16) Connect this pin to a resistor divider to set the linear regulator (FBVDDQ) output voltage. Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 5 www.anpec.com.tw APW7015 Functional Pin Description (Cont.) UGATE (Pin 24) Table 1 Output Voltage Program Connect UGATE pin to the PWM converter’s upper MOSFET gate. This pin provides the gate drive for the upper MOSFET. Nominal OUT1 Voltage DACOUT Pin Name VID2 1 1 1 1 0 0 0 0 VID1 1 1 0 0 1 1 0 0 VID0 1 0 1 0 1 0 1 0 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 Note : 0 = connected to GND or Vss, 1 = open or connected to 5V through pull-high resistors. Typical Characteristics +5VIN +3.3VIN Q3 Linear Controller VOUT2 APW7015 Q4 VOUT3 Q1 PWM1 Controller VOUT1 Q2 Linear Controller Customer Service Anpec Electronics Corp. Taipei Branch : 7F, No. 137, Lane 235, Pac Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, R. O. C. Tel : 886-2-89191368 Fax : 886-2-89191369 Head Office : 5F, No. 2 Li-Hsin Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050 Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 6 www.anpec.com.tw