CONTROLLER. US3005 Datasheet

US3005 Datasheet PDF

Part US3005
Description 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH DUAL LDO CONTROLLER
Feature US3004/US3005 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH DUAL LDO CONTROLLER FEATURES Me.
Manufacture UNISEM
Datasheet
Download US3005 Datasheet

US3004/US3005 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER US3005 Datasheet





US3005
US3004/US3005
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC WITH DUAL LDO CONTROLLER
FEATURES
Meets Latest VRM 8.4 Specification for PIII
Provides Single Chip Solution for Vcore, GTL+
and Clock Supply
On board DAC programs the output voltage
from 1.3V to 3.5V. The US3004/5 remains on for
VID code of (11111).
Dual linear regulator controller on board for
1.5V GTL+ and 2.5V clock supplies
Loss less Short Circuit Protection
Synchronous operation allows maximum effi-
ciency
Patented architecture allows fixed frequency
operation as well as 100% duty cycle during
dynamic load
Min part count, No external Compensation
Soft Start
High current totem pole driver for direct driv-
ing of the external Power MOSFET
Power Good function
APPLICATIONS
Pentium III & next generation processor DC to DC
converter application
Low cost Pentium with AGP
DESCRIPTION
The US3004/5 series of controller ICs are specifically
designed to meet Intel specification for Pentium III
microprocessor applications as well as the next genera-
tion P6 family processors. The IC provides a single
chip controller IC for the Vcore , GTL+ and clock
supplies required for the Pentium III applications.
These devices feature a patented topology that in
combination with a few external components as shown
in the typical application circuit ,will provide in excess of
20A of output current for an on- board DC/DC converter
while automatically providing the right output voltage via
the 5 bit internal DAC meeting the latest VRM specifica-
tion .These products also feature, loss less current sens-
ing by using the Rds-on of the high side Power
MOSFET as the sensing resistor, a Power Good win-
dow comparator that switches its open collector output
low when the output is outside of a ±10% window. Other
features of the device are ; Undervoltage lockout for both
5V and 12V supplies, an external programmable soft
start function as well as programming the oscillator fre-
quency by using an external capacitor.
TYPICAL APPLICATION
5V
C13
L1
C5
C3
Q1
R1
R2
L2
C7
Q2 R4
R12
R3
R13
Vout 3
C10
3.3V
12V
C1
C2
VID4
VID3
VID2
VID1
VID0
C4
12
V12
1 Ct
13 SS
D4
15
C6 R10
5 8 9 7 11 10 14
V5 CS+ HDrv CS- LDrv Gnd Vfb3
Lin1 2
US3004
Vfb1 3
D3 D2 D1 D0 PGd Vfb2 Lin2
16 17 18 19
6
4 20 C9
Q3
R11
C15
Q4
3.3V
R5
C8
R6 R9
Power Good
C14
Vout 1
C11
R7
R8
Vout 2
C12
R14
3004app2-1.9
R15
Notes: Pentium III is trade mark of Intel Corp.
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
0 TO 70
Device
US3004CW
US3005CW
Package
20 pin Plastic SOIC WB
20 pin Plastic SOIC WB
2.5V Output Voltage
Adjustable
Fixed
Rev. 1.2
12/8/00
4-1



US3005
US3004,US3005
ABSOLUTE MAXIMUM RATINGS
V5 supply Voltage ........................................... 10V
V12 Supply Voltage ............................................ 20V
Storage Temperature Range ................................. -65 TO 150°C
Operating Junction Temperature Range .......... 0 TO 125°C
PACKAGE INFORMATION
20 PIN WIDE BODY PLASTIC SOIC (W)
Ct / En 1
Lin1 2
Vfb1 3
Vfb2 4
V5 5
PGd 6
CS- 7
CS+ 8
HDrv 9
Gnd 10
TOP VIEW
20 Lin2
19 D0
18 D1
17 D2
16 D3
15 D4
14 Vfb3
13 SS
12 V12
11 LDrv
θJA =85°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
VID Section
DAC output voltage
(note 1)
DAC Output Line Regulation
DAC Output Temp Variation
VID Input LO
VID Input HI
VID input internal pull-up
resistor to V5
Power Good Section
Under voltage lower trip point
Under voltage upper trip point
UV Hysterises
Over voltage upper trip point
Over voltage lower trip point
OV Hysterises
Power Good Output LO
Power Good Output HI
Soft Start Section
Soft Start Current
SYM TEST CONDITION
Vout ramping down
Vout ramping up
Vout ramping up
Vout ramping down
RL=3mA
RL=5K pull up to 5V
CS+ =0V , CS- =5V
MIN
0.99Vs
TYP
Vs
2
27
MAX
1.01Vs
0.1
0.5
0.4
UNITS
V
%
%
V
V
k
0.89Vs
.015Vs
1.09Vs
.015Vs
4.8
0.90Vs
0.92Vs
.02Vs
1.10Vs
1.08Vs
.02Vs
10
0.91Vs
.025Vs
1.11Vs
.025Vs
0.4
V
V
V
V
V
V
V
V
uA
4-2
Rev. 1.2
12/8/00




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