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NIKO-SEM
5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller
FEATURES
N1164
GENERAL DESCRIPTION
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 (R) 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.
Synchronous operation with high efficiency TTL-compatible 5 bit DAC, output voltage selection from 1.3V to 3.5V programmable High current totem pole output, up to 2 A for direct driving of the external N-Channel power MOSFETs. 200 KHz fixed frequency internal oscillator Fast transient response Provides 2 regulated voltages, 1.5V and 2.5V for linear section Power-Good output voltage monitor Over-Voltage and Over-Current protection Logic level enable input High performance and low cost solution
APPLICATIONS
Powering Pentium (R) II, III or Deschutes, K6 and other advanced processor High power DC to DC controller with triple output supplies
TYPICAL APPLICATION
12V 5V
N1164 + +
ENABLE VID 0~4 POWER-GOOD 3.3V
LINEAR SECTION
SWITCHING SECTION
VCORE +
1.5V GTC BUS + + 2.5V CLOCK +
N1164, Motherboard Power Regulation for Computers
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NIKO-SEM
5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller
N1164
ABSOLUTE MAXIMUM RATINGS
VCC to GND BST to GND Thermal Resistance Junction to Case, JC Thermal Resistance Junction to Ambient, JA - 0.3V to 7V -0.3V to 15V 25 C/W 80 C/W Operating Temperature Range, TA Operating Junction Temperature Range, TJ Storage Temperature Range, TSTG Lead Temperature, TLEAD (Soldering, 10 Seconds) 0 to 70 C 0 to 125 C -65 to 150 C 300 C
ELECTRICAL SPECIFICATIONS

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
MIN 4.5
TYP MAX UNITS V mA % % dB mV KHz % A A % mA % nS mA V V % % K
BSTH - DH = 4.5V, DH - PGNDH = 2V BSTL - DL = 4.5V, DL - PGNDL = 2V
VOVP = 3.0V
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 5 2.45 2.500 2.55 1.47 1.500 1.53 1 1 1
LINEAR SECTIONS LDOV = 12V
IO = 0 to 8A
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NIKO-SEM
5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller
N1164
PIN CONFIGURATIONS
PIN DEFINITIONS
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Pin Name 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.
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NIKO-SEM
5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller
N1164
OUTPUT VOLTAGE

- 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
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NIKO-SEM
5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller
N1164
1.3V (VID=01111)
- Turn On Overshoot -
2.0V (VID=11111)
2.05V (VID=00000)
- Turn On Overshoot -
3.5V (VID=10000)
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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
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AUG-03-2001
NIKO-SEM
5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller
N1164
APPLICATION CIRCUIT
Mn-Cu Wire
10mOHM x 2
2 uH 5V + 1000uF 0.1uF 10
1000uF x 2 + +
MOSFET P50N02L x 2
4uH +
1500uF x 4 + + +
0.1uF VCORE
SBD 1A/30V
10K 1K DH 2.32K DL 0.1uF CS+ CSVO SENSE PWRGOOD GATE1 GATE2 LDOS2 LDOS1 AGND PGNDL + 330uF 2.5V CLOCK 100K 100K + 0.1uF
VCC VID 0 VID 1 VID 2 VID 3 VID 4 EN OVP VID 0 VID 1 VID 2 VID 3 VID 4 EN OVP BSTH 12V BSTL LDOV PGNDH
3.3V
+ 330uF
MOSFET P3055L x 2 1.5V GTC BUS
330uF
+
N1164
P.G
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NIKO-SEM
5 Bit Programmable Synchronous Buck Converter with Dual LDOs Controller
N1164
SOIC-24 (DW) MECHANICAL DATA
mm Dimension A B C D E F G 2.1 0.1 Min. 15.2 7.3 10 0.33 1.27 2.3 2.5 0.3 Typ. Max. 15.6 7.7 10.65 0.51 Dimension H I J K L M N Min. 0.4 0.23 0.25 0 mm Typ. Max. 1.27 0.32 0.74 8
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