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US3027CW の電気的特性と機能

US3027CWのメーカーはUNISEMです、この部品の機能は「5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPPLE LDO CONTROLLER」です。


製品の詳細 ( Datasheet PDF )

部品番号 US3027CW
部品説明 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPPLE LDO CONTROLLER
メーカ UNISEM
ロゴ UNISEM ロゴ 




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US3027CW Datasheet, US3027CW PDF,ピン配置, 機能
US3027
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK
FEATURES
PLUS TRIPPLE LDO CONTROLLER
PRELIMINARY DATASHEET
DESCRIPTION
Designed to meet VRM 9.0 specification for
next generation micrprocessors
On board 5 bit DAC programs the output
voltage from 1.075V to 1.850V in 25mV steps
Linear regulator controller on board for 1.8V
Provides Single Chip Solution for Vcore,
GTL+ ,AGP Bus, and 1.8V
Automatic Voltage Selection for AGP slot
Vddq supply
Linear regulator controller on board for 1.5V
GTL+ supply
Loss less Short Circuit Protection for all
outputs
Synchronous operation allows maximum
efficiency
Patented architecture allows fixed frequency
operation as well as 100% duty cycle during
dynamic load
Minimum part count
Soft Start
High current totem pole driver for direct
driving of the external Power MOSFET
Power Good function Monitors all Outputs
OVP Circuitry Protects the Switcher Output
and generates a Fault output
APPLICATIONS
Total Power Soloution for Next Generation Intel
Processor application
AMD K7 Low Cost Solution
The US3027 controller IC is specifically designed to meet
VRM 9.0 specification for next generation microproces-
sor applications requiring multiple on board regulators .
The US3027 provides a single chip controller IC for
the Vcore , 3LDO controllers, one with the auto-
matic select pin that connects to the TYPE DETECT
pin of the AGP slot for the AGP Vddq supply, one
for GTL+ and the other for the 1.8V chip set regula-
tor as required for the next generation PC applica-
tions. The US3027 is designed to use either Bipolar
transistors for Vout3(1.5V) and Vout4(1.8V) or if Vaux
pin is connected to 12V, then MOSFETs can also be
used as external pass elements. No external resis-
tor divider is necessary for any of the regulators.
The switching regulator feature a patented topology that
in combination with a few external components as shown
in the typical application circuit ,will provide well in ex-
cess 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 .The US3027 also fea-
tures, loss less current sensing for both switcher by
using the Rds-on of the high side Power MOSFET
as the sensing resistor, an output under voltage
shutdown that detects short circuit condition for the
linear outputs and latches the system off, and a
Power Good window comparator that switches its open
collector output low when any one of the outputs is out-
side of a pre programmed window.
TYPICAL APPLICATION
5V
3.3V
Vout2
LINEAR
CONTROL
US3027
SWITCHER
CONTROL
Vout1
Vout3
LINEAR
CONTROL
LINEAR
CONTROL
3027app3-1.0
Vout4
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
Device
US3027CW
Rev. 1.3
12/8/00
Package
28 pin Plastic SOIC WB
4-1

1 Page





US3027CW pdf, ピン配列
US3027
Error Comparator Section
Input bias current
Input Offset Voltage
Delay to Output
Current Limit Section
C.S Threshold Set Current
C.S Comp Offset Voltage
Hiccup Duty Cycle
Output Drivers Section
Rise Time
Fall Time
Dead band Time Between
High side and Synch Drive
(Vcore Switcher Only)
Oscillator Section (internal)
Osc Frequency
1.8V Regulator (Vsen 4)
Vsense Voltage
Vsense Voltage
Input bias current
Output Drive Current
Vo4
1.5V Regulator (Vsen 3)
Vsense Voltage
Vsense Voltage
Input bias current
Output Drive Current
Vo3
Power Good Section
Vsen1 UV lower trip point
Vsen1 UV upper trip point
Vsen1 UV Hysterises
Vsen1 HV upper trip point
Vsen1 HV lower trip point
Vsen1 HV Hysterises
Vsen2 trip point
Vsen4 trip point
Vsen3 trip point
Power Good Output LO
Power Good Output HI
Fault (Overvoltage) Section
Core O.V. upper trip point
Core O.V. lower trip point
FAULT Output HI
Soft Start Section
Soft Start Current
Vdiff=10mV
Css=0.1 uF
CL=3000pF
CL=3000pF
CL=3000pF
Rt=Open
Ta=25, Drive4 = Vsen4
Vaux-Vdrive>0.6V
Ta=25, Drive3 = Vsen3
Vaux-Vdrive>0.6V
Vsen1 ramping down
Vsen1 ramping up
Vsen1 ramping up
Vsen1 ramping down
Select<0.8V
Select>2V
Fix=GND
Fix=Open
Fix=GND
Fix=Open
RL=3mA
RL=5K pull up to 5V
Vsen1 ramping up
Vsen1 ramping down
Io=3mA
OCset=0V , Phase=5V
-2
-5
50
50
2 uA
+2 mV
100 nS
200
+5
10
uA
mV
%
70 nS
70 nS
200
217
1.800
1.800
2
nS
Khz
V
V
uA
mA
1.500
1.500
2
V
V
uA
mA
0.90Vs
0.92Vs
.02Vs
1.10Vs
1.08Vs
.02Vs
1.100
2.560
0.920
1.320
0.920
1.140
0.4
4.8
1.17Vs
1.15Vs
10
20
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
uA
Rev. 1.3
12/8/00
4-3


3Pages


US3027CW 電子部品, 半導体
US3027
BLOCK DIAGRAM
V12
V5
SD
Vsen1
PGood
Vsen3
Vsen4
Fix
Vaux
Drive4
Drive3
Select
Drive2
Vsen2
Enable
UVLO
1.26V
R
3R
1.17Vset
Over
Voltage
1.1Vset
Vset
+
Slope
Comp
0.9Vset
Enable
Soft
Start &
Fault
Logic
Enable
PWM
Control
Osc
V12
V12
Over
Current
200uA
Vset
1.5V
3.3V
R
3R
5Bit
DAC
Fb
UGate
LGate
Phase
OCSet
PGnd
Gnd
Fault / Rt
SS
VID0
VID1
VID2
VID3
VID4
3027blk1-1.0
Figure 1 - Simplified block diagram of the US3027.
4-6
Rev. 1.3
12/8/00

6 Page



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部品番号部品説明メーカ
US3027CW

5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPPLE LDO CONTROLLER

UNISEM
UNISEM


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