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| APW7015 Advanced PWM and Dual Linear Power Control Features * 3 Regulated Voltage are provided 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. 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. 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. * 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 * PWM Output: 2% Full Temperature * Linear Output: 3% Full Temperature * Fast Transient Response * * High-Bandwidth Error Amplifier * Full 0% to 100% Duty Ratio * 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 1MHz Pin Description VCC DRIVE2 NC NC VID2 VID1 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 UGATE PHASE LGATE PGND OCSET VSEN1 FB COMP VSEN3 DRIVE3 GND VAUX * Reduce External Component Count Applications * Motherboard Power Regulation for Computers VID0 PGOOD VSEN2 SS FAULT NC * Low-Voltage Distributed Power Supplies * VGA Card Power Regulation 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 Handling Code Temp. Range Package Code Package Code K : SOP - 24 Temp. Range C : 0 to 70 C Handling Code TU : Tube TR : Tape & Reel Block Diagram VSEN3 VAUX Power-on Reset (POR) VSEN1 OCSET VCC x 1.10 DRIVE3 + x 0.90 LUV VAUX VSEN2 DRIVE2 + + Absolute Maximum Ratings Symbol VCC VI , VO TA TJ TSTG TS Supply Voltage Input , Output or I/O Voltage Operating Ambient Temperature Range Junction Temperature Range Storage Temperature Range Soldering Temperature 2 Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 + x 0.75 + + - 200A PGOOD + - 1.26V LINEAR UNDERVOLTAGE x 1.15 + - INHIBIT FAULT SOFT START & FAULT LOGIC OV OC1 VCC DRIVER1 UGATE + INHIBIT PHASE + ERROR AMP1 - + PWM COMP1 PWM1 GATE CONTROL VCC SYNCH DRIVE + 1.5V OSCILLATOR VCC DACOUT 28A 4.5V LGATE PGND GND TTL D/A CONVERTER (DAC) FAULT SS FB COMP VID0 VID1 VID2 Parameter Rating 15 GND -0.3 V to VCC +0.3 0 to 70 0 to 125 -65 to +150 300 ,10 seconds Unit V V C C C C www.anpec.com.tw APW7015 Thermal Characteristics Symbol R JA Parameter Thermal Resistance in Free Air SOIC SOIC (with 3in2 of Copper) Value 75 65 Unit C/W Electrical Characteristics (Recommended operating conditions, Unless otherwise noted) Refer to Block and Simplified Power System Diagrams, and Typical Application Schematic APW7015 Symbol VCC Supply Current ICC Nominal Supply Current UGATE, LGATE, DRIVE2, DRIVE3 open Vocset=4.5V Vocset=4.5V Vocset=4.5V Vocset=4.5V 8.2 2.5 0.5 1.26 RT= Open RT= Open 185 200 1.9 215 9 mA Parameter Test Conditions Min. Typ. Max. Unit Power-on Reset Rising VCC Threshold Falling VCC Threshold Rising VAUX Threshold VAUX Threshold Hysteresis Rising VOCSET Threshold Oscillator FOCS VOSC Free Running Frequency Ramp Amplitude kHz VP-P 10.4 V V V V V DAC and Bandgap Reference DAC(VID0-VID2) Input Low Voltage DAC(VID0-VID2) Input High Voltage DACOUT Voltage accuracy VBG Bandgap Reference Voltage Bandgap Reference Tolerance Linear Regulators (OUT2, OUT3) Regulation (All Linears) Output Drive Current (All Liners) DC Gain GBWP Gain-Bandwidth Product SR Slew Rate COMP=10pF 3 0.8 2.0 -2.0 1.265 -2.5 3 VAUX-VDRIVE >0.6V 20 40 88 15 6 +2.5 +2.0 V V % V % % mA dB MHz V/s Synchronous PWM Controller Error Amplifier Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 www.anpec.com.tw APW7015 Electrical Characteristics Cont. APW7015 Symbol Parameter Test Conditions Min. Typ. 1 3.5 1 3 Max. PWM Controller Gate Driver IUGATE UGATE Source RUGATE ILGATE RLGATE UGATE Sink LGATE Source LGATE Sink Unit VCC=12V, VUGATE =6V VUGATE1-PHASE =1V VCC=12V, VLGATE =1V VLGATE= 1V A A Protection VSEN1 Over-Voltage (VSEN1/DACOUT) IOVP FAULT Souring Current IOCSET ISS OCSET Current Source Soft Start Current VSEN1 Rising VFAULT/RT=2.0V VOCSET= 4.5VDC 170 115 8.5 200 28 120 % mA A A 230 Power Good VSEN1 Upper Threshold (VSEN1/DACOUT) VSEN1 Under Voltage (VSEN1/DACOUT) VSEN1 Hysteresis (VSEN1 /DACOUT) VPGOOD PGOOD Voltage Low VSEN1 Rising VSEN1 Rising Upper /Lower Threshold IPGOOD= -4mA 108 92 2 110 94 % % % 0.8 V 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. The voltage at this pin is monitored for Power-On Reset (POR) purposes. 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. VID2, VID1, VID0 (Pins 5, 6 and 7) 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 Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 4 of DACOUT sets the VTT converter output voltage, as well as the corresponding PGOOD and OVP thresholds. 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 within 10% of the DACOUT reference voltage or when any of the other outputs are below their undervoltage thresholds. VSEN2 (Pin 9) Connect this pin to a resistor divider to set the linear regulator (NVVDD) output voltage. www.anpec.com.tw APW7015 Functional Pin Description (Cont.) SS (Pin 10) 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. 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) (RT to GND) COMP and FB (Pin 17, and 18) 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. 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. OCSET (Pin 20) Connect a resistor from this pin to the drain of the respective upper MOSFET. This resistor, an internal 200A 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. PGND (Pin 21) This is the power ground connection. Tie the synchronous PWM converter's lower MOSFET source to this pin. LGATE (Pin 22) Connect LGATE to the PWM converter's lower MOSFET gate. This pin provides the gate drive for the lower MOSFET. 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. 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 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) (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. GND (Pin 14) Signal ground for the IC. All voltage levels are measured with respect to this pin. DRIVE3 (Pin 15) 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. APW7015 Functional Pin Description (Cont.) UGATE (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 Output Voltage Program 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 Nominal OUT1 Voltage DACOUT 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 VOUT2 Q3 Linear Controller APW7015 Q4 VOUT3 Linear Controller PWM1 Controller Q1 VOUT1 Q2 Customer Service Anpec Electronics Corp. Head Office : 5F, No. 2 Li-Hsin Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050 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 Copyright ANPEC Electronics Corp. Rev. P.1 - Mar., 2000 6 www.anpec.com.tw |
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