ON BOARD. US3018 Datasheet

US3018 BOARD. Datasheet pdf. Equivalent

Part US3018
Description 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON BOARD
Feature US3018 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON BOARD FEATURES Provi.
Manufacture UNISEM
Datasheet
Download US3018 Datasheet




US3018
US3018
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS
FEATURES
LDO CONTROLLER AND 200mA LDO ON BOARD
PRELIMINARY DATASHEET
DESCRIPTION
Provides Single Chip Solution for Vcore, GTL+
& Clock Supply
200 mA On board LDO regulator
Designed to meet the latest Intel specification
for Pentium II
On board DAC programs the output voltage
from 1.3V to 3.5V
Linear regulator controller on board for 1.5V
GTL+ supply
Loss less Short Circuit Protection with HICCUP
Synchronous operation allows maximum effi-
ciency
Patented architecture allows fixed frequency
operation as well as 100% duty cycle during
dynamic load
Soft Start
High current totem pole driver for direct driv-
ing of the external Power MOSFET
Power Good function Monitors all Outputs
OVP Circuitry Protects the Switcher Output and
generates a Fault signal
Thermal Shutdown
Logic Level Enable Input
APPLICATIONS
The US3018 controller IC is specifically designed to meet
Intel specification for Pentium IImicroprocessor ap-
plications as well as the next generation of P6 family
processors. The US3018 provides a single chip con-
troller IC for the Vcore , LDO controller for GTL+
and an internal 200mA regulator for clock supply
which are required for the Pentium II applications.
These devices feature a patented topology that in com-
bination with a few external components as shown in
the typical application circuit ,will provide in excess of
18A of output current for an on- board DC/DC converter
while automatically providing the right output voltage via
the 5 bit internal DAC. The US3018 also features, loss
less current sensing for both switchers by using the
Rds-on of the high side Power MOSFET as the sens-
ing resistor, internal current limiting for the clock
supply, a Power Good window comparator that switches
its open collector output low when any one of the out-
puts is outside of a pre programmed window. Other fea-
tures of the device are ; Undervoltage lockout for both
5V and 12V supplies, an external programmable soft
start function , programming the oscillator frequency via
an external resistor, OVP circuitry for both switcher out-
puts and an internal thermal shutdown.
Total Power Soloution for Pentium II processor
application
TYPICAL APPLICATION
5V
3.3V
Vout3
US3018 SWITCHER1
CONTROL
LINEAR
LINEAR
CONTROL REGULATOR
Vout1
3018app3-1.1
Vout2
Notes: Pentium II is trade mark of Intel Corp.
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
Device
US3018CW
Rev. 1.4
12/8/00
Package
24 pin Plastic SOIC WB
4-1



US3018
US3018
ABSOLUTE MAXIMUM RATINGS
V5 supply Voltage ........................................... 7V
V12 Supply Voltage ............................................ 20V
Storage Temperature Range ................................. -65 TO 150°C
Operating Junction Temperature Range .......... 0 TO 125°C
PACKAGE INFORMATION
24 PIN WIDE BODY PLASTIC SOIC (W)
V12 1
VID4 2
VID3 3
VID2 4
VID1 5
VID0 6
PGood 7
V5 8
SS 9
Fault / Rt 10
Fb2 11
Vin2 12
TOP VIEW
24 UGate1
23 Phase1
22 LGate1
21 PGnd
20 OCSet1
19 Vsen1
18 Fb1
17 En
16 Fb3
15 Gate3
14 Gnd
13 Vout2
θJA =80°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over ,V12 = 12V, V5 = 5V and Ta=0 to 70°C. Typical values
refer to Ta =25°C. Low duty cycle pulse testing are used which keeps junction and case temperatures equal to the
ambient temperature.
PARAMETER
SYM TEST CONDITION
MIN TYP MAX UNITS
Supply UVLO Section
UVLO Threshold-12V
Supply ramping up
10 V
UVLO Hysterises-12V
0.4 V
UVLO Threshold-5V
Supply ramping up
4.3 V
UVLO Hysterises-5V
0.3 V
Supply Current
Operating Supply Current
I12
V12 6
mA
I5 V5 20
Switching Controller, Vcore (Vout 1)
VID Section
DAC output voltage (note 1) Vdac
0.99Vs Vs
1.01Vs V
DAC Output Line Regulation
0.1 %
DAC Output Temp Variation
0.5 %
VID Input LO
0.8 V
VID Input HI
2V
VID input internal pull-up
27 k
resistor to V5
4-2
Rev. 1.4
12/8/00







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