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NIKO-SEM 5 Bit Programmable Synchronous Buck
Converter with Dual LDOs Controller
N1164
GENERAL DESCRIPTION
FEATURES
The N1164 is a 5 bit TTL-compatible input,
z Synchronous operation with high efficiency
digital-to-analog (DAC) programmable, syn-
z TTL-compatible 5 bit DAC, output voltage
chronous buck converter with dual LDOs
controller designed specifically to power the
Pentium ® II as well as the next generation of
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
P6 family or other high performance core
logic in desktop personal computer and file
power MOSFETs.
z 200 KHz fixed frequency internal oscillator
servers CPU applications.
z Fast transient response
The N1164 switching section provides pro-
z Provides 2 regulated voltages, 1.5V and
grammability of output voltage from 1.3V to
2.5V for linear section
2.05V in 50mV steps and 2.0V to 3.5V in 100
z Power-Good output voltage monitor
mV increments and the linear sections use
external N-Channel power MOSFETs to
z Over-Voltage and Over-Current protection
z Logic level enable input
provide fixed output voltages of 1.5V for GTL
z High performance and low cost solution
bus and 2.5V for clock.
The N1164 monitors all the output voltages. APPLICATIONS
A signal Power-Good signal is issued when
the core is within ±15% of the DAC setting.
z Powering Pentium ® II, III or Deschutes,
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TYPICAL APPLICATION
12V
+
N1164
ENABLE
VID 0~4
POWER-GOOD
LINEAR
SECTION
SWITCHING
SECTION
3.3V
+
5V
+
VCORE
+
1.5V
GTC BUS
+
2.5V
CLOCK
+
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N1164, Motherboard Power Regulation for Computers
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NIKO-SEM 5 Bit Programmable Synchronous Buck
Converter with Dual LDOs Controller
N1164
ABSOLUTE MAXIMUM RATINGS
z VCC to GND
- 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
25 °C/W
80 °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, LDOV = 11.4V ~ 12.6V, TA = 25°C>
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
et4U.com
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
Quiescent Current
Output Voltage (LDO1)
Output Voltage (LDO2)
Load Regulation
Line Regulation
Output Impedance
SWITCHING SECTION
VCC
VCC = 5.0V
IO = 2A
IO = 0.3A to 15A
All VIDDatCaSohdeeest4U.com
VOSENSE to VO
BSTH - DH = 4.5V, DH - PGNDH = 2V
BSTL - DL = 4.5V, DL - PGNDL = 2V
VOVP = 3.0V
LINEAR SECTIONS
LDOV = 12V
IO = 0 to 8A
4.5 7
8 15
See Table 1.
1
0.5
35
55 70 85
175 200 225
90 95
1
1
120
10
85 115
100 200
5
2.45 2.500 2.55
1.47 1.500 1.53
1
1
1
V
mA
%
%
dB
mV
KHz
%
A
A
%
mA
%
nS
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mA
V
V
%
%
K
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NIKO-SEM 5 Bit Programmable Synchronous Buck
Converter with Dual LDOs Controller
N1164
PIN CONFIGURATIONS
PIN DEFINITIONS
Pin # Pin Name
Pin Function Description
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1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
AGND
GATE1
LDOS1
LDOS2
VCC
OVP
PWRGOOD*
CS-
CS+
PGNDL
DH
PGNDL
DL
BSTL
BSTH
Small signal analog and digital ground
Gate drive output LDO1
Sense input for LDO1
Sense input for LDDaOtaS2heet4U.com
Input voltage
High signal out if VO>set point +20%
Open collector logic output, high if VO within 10% of set point
Current sense input (Negative)
Current sense input (Positive)
Power ground for high side switch
High side driver output
Power ground for low side switch
Low side driver output
Supply for low side driver
Supply for high side driver
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16 EN* Logic low shuts down the converter; high or open for normal operation.
17 VOSENSE Top end of internal feedback chain
18 VID4* Programming input (MSB)
19 VID3* Programming input
20 VID2* Programming input
21 VID1* Programming input
22 VID0* Programming input (LSB)
23 LDOV +12V for LDO section
24 GATE2 Gate drive output LDO2
* : All logic level inputs and outputs are open collector TTL compatible.
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