N1153

N1153 ETC

Document overview

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Technical content

5 Bit Programmable Synchronous

The N1153 is a low-cost, 5 bit TTL-compatible input, digital-to-analog (DAC) programmable, synchronous buck converter controller design- ed specifically to power the Pentium ® II as well as the next generation of P6 family or other high performance core logic in desktop person- al computer CPU applications. Additional features also include temperature compensated voltage reference, triangle wave oscillator, current limits comparator, frequency shift over-current protection, and an access- ible, internally compensated error amplifier, power good signal, logic compatible shutdown, and over voltage protection are also provide. The N1153 operates at a fixed 200KHz, provid- ing an optimum compromise between efficien- cy, external component size, and cost.

FEATURES

z High performance and low cost solution 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 Power-Good output voltage monitor zzzz Over-Voltage and Over-Current protection

APPLICATIONS

z Powering Pentium ® II, III or Deschutes, K6 and other advanced processor z Multiple microprocessor supplies z High power DC to DC controller z Programmable power supplies TYPICAL APPLICATION 12V VID 0 VID 4 VID 1 VID 2 VID 3 P.G S.D VCORE D/A AND SHUT-DOWN LOGIC TEMP. COMPENSATED VOLTAGE REFERENCE TRIANGLE WAVE OSCILLATOR CURRENT LIMIT COMPARATOR FREQUENCY SHIFT OVER-CURRENT PROTECTION INTERNALLY COMPENSATED ERROR AMPLIFIER N1153, Motherboard Power Regulation for Computers

z VCC to GND, VIN - 0.3V to 7V z Operating Temperature Range, T A 0 to 70 °C z BST to GND -0.3V to 15V z Operating Junction Temperature Range, TJ 0 to 125 °C z Thermal Resistance Junction to Case, θJC 30 °C/W z Storage Temperature Range, T STG -65 to 150 °C z Thermal Resistance Junction to Ambient, θJA 90 °C/W z Lead Temperature, TLEAD (Soldering, 10 Seconds) 300 °C ELECTRICAL SPECIFICATIONS <Unless specified: VCC = 4.75V ~ 5.25V, GND = PGND = 0V, VOSENSE = VO , 0mV < (CS+ - CS-) < 60mV, TA = 25°C> PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Voltage V CC 4.2 7 V Supply Current V CC = 5.0V 5 mA Output Voltage I O = 2A See Table 1. Load Regulation I O = 0.3A to 15A 1 % Line Regulation All VID Codes 0.5 % Gain (AOL) V OSENSE to VO 35 dB Current Limit Voltage 60 70 80 mV Oscillator Frequency 180 200 220 KHz Oscillator Max Duty Cycle 90 95 % Peak DH Sink/Source Current BSTH - DH = 4.5V, DH - PGNDH = 2V 1 A Peak DL Sink/Source Current BSTL - DL = 4.5V, DL - PGNDL = 2V 1 A OVP Threshold Voltage 120 % OVP Source Current V OVP = 3.0V 10 mA Power-Good Threshold Voltage 85 115 % Dead Time 100 200 nS

Pin # Pin Name Pin Function Description

1 GND Small signal analog and digital ground

2 V CC Input voltage

3 OVP High signal out if V O>set point +20%

4 PWRGOOD * Open collector logic output, high if V O within 10% of set point

5 CS- Current sense input (Negative)

6 CS+ Current sense input (Positive)

7 PGNDL Power ground for high side switch

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.

<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 4 3 2 1 0 Min. (V) Typ. (V) Max. (V) 0 1 1 1 1 1.274 1.300 1.326 0 1 1 1 0 1.323 1.350 1.377 0 1 1 0 1 1.372 1.400 1.428 0 1 1 0 0 1.421 1.450 1.479 0 1 0 1 1 1.470 1.500 1.530 0 1 0 1 0 1.527 1.550 1.573 0 1 0 0 1 1.576 1.600 1.624 0 1 0 0 0 1.625 1.650 1.675 0 0 1 1 1 1.675 1.700 1.726 0 0 1 1 0 1.724 1.750 1.776 0 0 1 0 1 1.773 1.800 1.827 0 0 1 0 0 1.822 1.850 1.878 0 0 0 1 1 1.871 1.900 1.929 0 0 0 1 0 1.921 1.950 1.979 0 0 0 0 1 1.970 2.000 2.030 0 0 0 0 0 2.019 2.050 2.081 1 1 1 1 1 1.940 2.000 2.060 1 1 1 1 0 2.058 2.100 2.142 1 1 1 0 1 2.156 2.200 2.244 1 1 1 0 0 2.254 2.300 2.346 1 1 0 1 1 2.352 2.400 2.448 1 1 0 1 0 2.450 2.500 2.550 1 1 0 0 1 2.548 2.600 2.652 1 1 0 0 0 2.646 2.700 2.754 1 0 1 1 1 2.744 2.800 2.856 1 0 1 1 0 2.842 2.900 2.958 1 0 1 0 1 2.940 3.000 3.060 1 0 1 0 0 3.038 3.100 3.162 1 0 0 1 1 3.136 3.200 3.264 1 0 0 1 0 3.234 3.300 3.366 1 0 0 0 1 3.332 3.400 3.468 1 0 0 0 0 3.430 3.500 3.570 Note: IO = 2.0A in Application Circuit

+++ + +++ VID 0 VID 1 VID 2 VID 3 VID 4 P.G 12V OVP S.D VCORE 1000uF 4uH SBD P50N02L x 2 10K 0.1uF 10mOHM x 2 Mn-Cu Wire 1500uF x 4MOSFET 1A/30V0.1uF 1000uF x 22 uH 0.1uF VID 0 VID 1 VID 2 VID 3 VID 4 POWERGOOD OVP GND PGNDL PGNDH BSTH BSTL DH DL VCC CS- CS+ VO SENSE SHUTDOWN N1153 XNC 0.1uF 2.32K

SOIC-20 (DW) MECHANICAL DATA mm mm A 12.6 13.0 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 L F 2.1 2.3 2.5 M G 0.1 0.3 N