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, syn-
chronous buck converter with dual LDOs
controller designed specifically to power the
Pentium
廬
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 pro-
grammability 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
鹵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
廬
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
1
AUG-03-2001
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