參數(shù)資料
型號(hào): IRU3027CW
廠商: International Rectifier
英文描述: 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH TRIPLE LDO CONTROLLER
中文描述: 5位可編程同步降壓控制器芯片,三聯(lián)LDO控制器
文件頁(yè)數(shù): 4/10頁(yè)
文件大?。?/td> 66K
代理商: IRU3027CW
4
Rev. 1.5
07/17/02
IRU3027
www.irf.com
This pin controls the gate of an external MOSFET for the AGP linear regulator.
Leaving this pin open provides fixed output voltages of the 1.5V and 1.8V for the #3 and
#4 linear regulators. When this pin is grounded the reference to the linear regulators are
set to 1.26V and therefore the output of the regulators can be programmed to any volt-
ages above the 1.26V using: V
OUT
= 1.26
×
(1 + R
TOP
/R
BOT
)
Where:
R
TOP
=Top resistor connected from the output to the V
SENSE
pin
R
BOT
=Bottom resistor connected from the V
SENSE
pin to ground.
This pin selects a range of output voltages for the DAC. When in the LOW state the
range is 1.3V to 2.05V and when it switches to HI state the range is 2V to 3.5V. This pin
is TTL compatible that realizes a logic “1” as either HI or Open. When left open, this pin
is pulled up internally by a 27K
resistor to 5V supply.
MSB input to the DAC that programs the output voltage. This pin is TTL compatible that
realizes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by
a 27K
resistor to 5V supply.
Input to the DAC that programs the output voltage. This pin is TTL compatible that real-
izes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by a
27K
resistor to 5V supply.
Input to the DAC that programs the output voltage. This pin is TTL compatible that real-
izes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by a
27K
resistor to 5V supply.
LSB input to the DAC that programs the output voltage. This pin is TTL compatible that
realizes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by
a 27K
resistor to 5V supply.
This pin is an open collector output that switches LO when any of the outputs are outside
of the specified under-voltage trip point. It also switches low when V
SEN
1 pin is more than
10% above the DAC voltage setting.
PIN DESCRIPTIONS
PIN# PIN SYMBOL PIN DESCRIPTION
1
2
Fix
D4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
D1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Vs
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
1.275
1.300
1.325
1.350
1.375
1.400
1.425
1.450
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
D1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Vs
1.475
1.500
1.525
1.550
1.575
1.600
1.625
1.650
1.675
1.700
1.725
1.750
1.775
1.800
1.825
1.850
Table 1 - Set point voltage vs. VID codes.
3
4
5
6
7
8
Drive2
VID4
VID3
VID2
VID1
VID0
PGood
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