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 design-
ed specifically to power the Pentium
廬
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.
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
廬
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
1
AUG-03-2001
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