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NIKO-SEM
5 Bit Programmable Synchronous DC/DC Controller
FEATURES
N1153
GENERAL DESCRIPTION
The N1153 is a low-cost, 5 bit TTL-compatible input, digital-to-analog (DAC) programmable, synchronous buck converter 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 CPU applications. Additional features also include temperature compensated voltage reference, triangle wave oscillator, current limits comparator, frequency shift over-current protection, and an accessible, internally compensated error amplifier, power good signal, logic compatible shutdown, and over voltage protection are also provide. The N1153 operates at a fixed 200KHz, providing an optimum compromise between efficiency, external component size, and cost.
High performance and low cost solution 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 Power-Good output voltage monitor Over-Voltage and Over-Current protection
APPLICATIONS
Powering Pentium (R) II, III or Deschutes, K6 and other advanced processor Multiple microprocessor supplies High power DC to DC controller Programmable power supplies
TYPICAL APPLICATION
12V
5V +
VID 0 VID 1 VID 2 VID 3 VID 4 P.G S.D
D/A AND SHUT-DOWN LOGIC
CURRENT LIMIT COMPARATOR
+
TEMP. COMPENSATED VOLTAGE REFERENCE
FREQUENCY SHIFT OVER-CURRENT PROTECTION
VCORE +
TRIANGLE WAVE OSCILLATOR
INTERNALLY COMPENSATED ERROR AMPLIFIER
N1153, Motherboard Power Regulation for Computers
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AUG-03-2001
NIKO-SEM
5 Bit Programmable Synchronous DC/DC Controller
N1153
ABSOLUTE MAXIMUM RATINGS
VCC to GND, VIN BST to GND Thermal Resistance Junction to Case, JC Thermal Resistance Junction to Ambient, JA - 0.3V to 7V -0.3V to 15V 30 C/W 90 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
CONDITIONS VCC VCC = 5.0V IO = 2A IO = 0.3A to 15A All VID Codes VOSENSE to VO
MIN 4.2
TYP MAX UNITS 7 V mA % % dB mV KHz % A A % mA % nS
BSTH - DH = 4.5V, DH - PGNDH = 2V BSTL - DL = 4.5V, DL - PGNDL = 2V
VOVP = 3.0V
5 See Table 1. 1 0.5 35 60 70 80 180 200 220 90 95 1 1 120 10 85 115 100 200
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AUG-03-2001
NIKO-SEM
5 Bit Programmable Synchronous DC/DC Controller
N1153
PIN CONFIGURATIONS
PIN DEFINITIONS
Pin # Pin Name Pin Function Description 1 GND Small signal analog and digital ground 2 VCC Input voltage 3 OVP High signal out if VO>set point +20% 4 PWRGOOD* Open collector logic output, high if VO within 10% of set point 5 CSCurrent sense input (Negative) 6 CS+ Current sense input (Positive) PGNDL Power ground for high side switch 7 8 DH High side driver output 9 NC No connected 10 PGNDL Power ground for high side switch 11 DL Low side driver output 12 BSTL Supply for low side driver 13 BSTH Supply for high side driver 14 SHUTDOWN Logic low shuts down the converter 15 VOSENSE Top end of internal feedback chain 16 VID4* Programming input (MSB) 17 VID3* Programming input 18 VID2* Programming input 19 VID1* Programming input 20 VID0* Programming input (LSB) * : All logic level inputs and outputs are open collector TTL compatible.
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AUG-03-2001
NIKO-SEM
5 Bit Programmable Synchronous DC/DC Controller
N1153
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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AUG-03-2001
NIKO-SEM
5 Bit Programmable Synchronous DC/DC Controller
N1153
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 0.1uF 1K VCC VID 0 VID 1 VID 2 VID 3 VID 4 P.G OVP VID 0 VID 1 VID 2 VID 3 VID 4 DH 2.32K DL 0.1uF X CS+ CSVO SENSE SHUTDOWN NC + POWERGOOD OVP BSTH 12V BSTL PGNDH PGNDL GND
N1153
S.D
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AUG-03-2001
NIKO-SEM
5 Bit Programmable Synchronous DC/DC Controller
N1153
SOIC-20 (DW) MECHANICAL DATA
mm Dimension A B C D E F G 2.1 0.1 Min. 12.6 7.3 10 0.33 1.27 2.3 2.5 0.3 Typ. Max. 13.0 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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AUG-03-2001

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