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N1153

5 Bit Programmable Synchronous



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N1153 pdf
NIKO-SEM
5 Bit Programmable Synchronous
DC/DC Controller
N1153
GENERAL DESCRIPTION
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
z 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 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
TRIANGLE
WAVE
OSCILLATOR
INTERNALLY
COMPENSATED
ERROR AMPLIFIER
5V
+
VCORE
+
N1153, Motherboard Power Regulation for Computers
1 AUG-03-2001



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N1153 pdf
NIKO-SEM
5 Bit Programmable Synchronous
DC/DC Controller
N1153
ABSOLUTE MAXIMUM RATINGS
z VCC to GND, VIN
- 0.3V to 7V
z BST to GND
z Thermal Resistance
Junction to Case, θJC
z Thermal Resistance
Junction to Ambient, θJA
-0.3V to 15V
30 °C/W
90 °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, TA = 25°C>
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
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
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
4.2 7
5
See Table 1.
1
0.5
35
60 70 80
180 200 220
90 95
1
1
120
10
85 115
100 200
V
mA
%
%
dB
mV
KHz
%
A
A
%
mA
%
nS
2 AUG-03-2001



Part Number N1153
Description 5 Bit Programmable Synchronous
Maker ETC - ETC
Total Page 6 Pages
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