NIKO-SEM 5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller N1164 GENERAL DESCRIPTION FEATURES The N1164 is a 5 bit TTL-compatible input, digital-to-analog (DAC) programmable, synchronous buck converter with dual LDOs controller designed specifically to power the Pentium ® II as well as the next generation of P6 family or other high performance core logic in desktop personal computer and file servers CPU applications. The N1164 switching section provides programmability of output voltage from 1.3V to 2.05V in 50mV steps and 2.0V to 3.5V in 100 mV increments and the linear sections use external N-Channel power MOSFETs to provide fixed output voltages of 1.5V for GTL bus and 2.5V for clock. The N1164 monitors all the output voltages. A signal Power-Good signal is issued when the core is within ±15% of the DAC setting. Additional features are built-in over-voltage, over-current protections for the core output and logic compatible shutdown. z Synchronous operation with high efficiency z TTL-compatible 5 bit DAC, output voltage selection from 1.3V to 3.5V programmable z High current totem pole output, up to 2 A for direct driving of the external N-Channel power MOSFETs. z 200 KHz fixed frequency internal oscillator z Fast transient response z Provides 2 regulated voltages, 1.5V and 2.5V for linear section z Power-Good output voltage monitor z Over-Voltage and Over-Current protection z Logic level enable input z High performance and low cost solution APPLICATIONS z Powering Pentium ® II, III or Deschutes, K6 and other advanced processor z High power DC to DC controller with triple output supplies TYPICAL APPLICATION 12V 5V N1164 + + ENABLE LINEAR SECTION VID 0~4 SWITCHING SECTION VCORE + POWER-GOOD 1.5V GTC BUS 3.3V + + 2.5V CLOCK + N1164, Motherboard Power Regulation for Computers 1 AUG-03-2001 NIKO-SEM 5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller N1164 ABSOLUTE MAXIMUM RATINGS z VCC to GND - 0.3V to 7V z BST to GND -0.3V to 15V z Thermal Resistance Junction to Case, θJC z Thermal Resistance Junction to Ambient, θJA 25 °C/W 80 °C/W z Operating Temperature Range, TA z Operating Junction Temperature Range, TJ z Storage Temperature Range, TSTG z Lead Temperature, TLEAD (Soldering, 10 Seconds) 0 to 70 °C 0 to 125 °C -65 to 150 °C 300 °C ELECTRICAL SPECIFICATIONS <Unless specified: VCC = 4.75V ~ 5.25V, GND = PGND = 0V, VOSENSE = VO , 0mV < (CS+ - CS-) < 60mV, LDOV = 11.4V ~ 12.6V, TA = 25°C> PARAMETER Supply Voltage Supply Current Output Voltage Load Regulation Line Regulation Gain (AOL) Current Limit Voltage Oscillator Frequency Oscillator Max Duty Cycle Peak DH Sink/Source Current Peak DL Sink/Source Current OVP Threshold Voltage OVP Source Current Power-Good Threshold Voltage Dead Time Quiescent Current Output Voltage (LDO1) Output Voltage (LDO2) Load Regulation Line Regulation Output Impedance CONDITIONS SWITCHING SECTION VCC VCC = 5.0V IO = 2A IO = 0.3A to 15A All VID Codes VOSENSE to VO BSTH - DH = 4.5V, DH - PGNDH = 2V BSTL - DL = 4.5V, DL - PGNDL = 2V VOVP = 3.0V LINEAR SECTIONS LDOV = 12V IO = 0 to 8A 2 MIN TYP MAX UNITS 4.5 7 8 15 See Table 1. 1 0.5 35 55 70 85 175 200 225 90 95 1 1 120 10 85 115 100 200 V mA % % dB mV KHz % A A % mA % nS 5 2.45 2.500 2.55 1.47 1.500 1.53 1 1 1 mA V V % % KΩ AUG-03-2001 NIKO-SEM 5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller N1164 PIN CONFIGURATIONS PIN DEFINITIONS Pin # Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 AGND GATE1 LDOS1 LDOS2 VCC OVP PWRGOOD* CSCS+ PGNDL DH PGNDL DL BSTL BSTH Pin Function Description Small signal analog and digital ground Gate drive output LDO1 Sense input for LDO1 Sense input for LDO2 Input voltage High signal out if VO>set point +20% Open collector logic output, high if VO within 10% of set point Current sense input (Negative) Current sense input (Positive) Power ground for high side switch High side driver output Power ground for low side switch Low side driver output Supply for low side driver Supply for high side driver 16 Logic low shuts down the converter; high or open for normal operation. EN* 17 VOSENSE Top end of internal feedback chain 18 VID4* Programming input (MSB) 19 VID3* Programming input 20 VID2* Programming input 21 VID1* Programming input 22 VID0* Programming input (LSB) 23 LDOV +12V for LDO section 24 GATE2 Gate drive output LDO2 * : All logic level inputs and outputs are open collector TTL compatible. 3 AUG-03-2001 NIKO-SEM 5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller N1164 OUTPUT VOLTAGE <Unless specified: VCC = 4.75V ~ 5.25V, GND = PGND = 0V, VOSENSE = VO , 0mV < (CS+ - CS-) < 60mV, LDOV = 11.4V ~ 12.6V, TA = 25°C> − Table 1 − VID Min. Typ. Max. 43210 (V) (V) (V) 01111 1.274 1.300 1.326 01110 1.323 1.350 1.377 01101 1.372 1.400 1.428 01100 1.421 1.450 1.479 01011 1.470 1.500 1.530 01010 1.527 1.550 1.573 01001 1.576 1.600 1.624 01000 1.625 1.650 1.675 00111 1.675 1.700 1.726 00110 1.724 1.750 1.776 00101 1.773 1.800 1.827 00100 1.822 1.850 1.878 00011 1.871 1.900 1.929 00010 1.921 1.950 1.979 00001 1.970 2.000 2.030 00000 2.019 2.050 2.081 11111 1.940 2.000 2.060 11110 2.058 2.100 2.142 11101 2.156 2.200 2.244 11100 2.254 2.300 2.346 11011 2.352 2.400 2.448 11010 2.450 2.500 2.550 11001 2.548 2.600 2.652 11000 2.646 2.700 2.754 10111 2.744 2.800 2.856 10110 2.842 2.900 2.958 10101 2.940 3.000 3.060 10100 3.038 3.100 3.162 10011 3.136 3.200 3.264 10010 3.234 3.300 3.366 10001 3.332 3.400 3.468 10000 3.430 3.500 3.570 Note: IO = 2.0A in Application Circuit 4 AUG-03-2001 NIKO-SEM 5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller 1.3V (VID=01111) 2.05V (VID=00000) - Turn On Overshoot - - Turn On Overshoot - 5 N1164 2.0V (VID=11111) 3.5V (VID=10000) AUG-03-2001 NIKO-SEM 5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller N1164 Transient Response, VO=2.8V, IO=0.3A to 10A Typical Ripple & Noise, VO=2.8V, IO=10A 6 AUG-03-2001 5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller NIKO-SEM N1164 APPLICATION CIRCUIT Mn-Cu Wire 10mOHM x 2 2 uH MOSFET P50N02L x 2 1000uF x 2 4uH 1500uF x 4 0.1uF 5V VCORE + 1000uF + 0.1uF + + SBD 1A/30V 10 + + + 10K 1K 0.1uF CS+ VID 2 CS- VID 3 VID 3 VO SENSE VID 4 VID 4 PWRGOOD EN OVP 12V EN GATE1 OVP GATE2 BSTH LDOS2 BSTL LDOS1 LDOV + MOSFET P3055L x 2 330uF + 1.5V GTC BUS 2.5V CLOCK + AGND PGNDH + 100K VID 1 VID 2 330uF VID 1 3.3V 100K DL 2.32K DH VID 0 0.1uF VCC VID 0 330uF PGNDL N1164 P.G 7 AUG-03-2001 NIKO-SEM 5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller N1164 SOIC-24 (DW) MECHANICAL DATA mm Dimension Min. Typ. mm Dimension Max. Min. Typ. Max. A 15.2 15.6 H 0.4 1.27 B 7.3 7.7 I 0.23 0.32 C 10 10.65 J 0.25 0.74 D 0.33 0.51 K 0° 8° E 1.27 F 2.1 G 0.1 2.3 L 2.5 M 0.3 N 8 AUG-03-2001