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參數(shù)資料
| 型號： | IRU3018 |
| 廠商： | International Rectifier |
| 英文描述： | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON-BOARD |
| 中文描述： | 5位可編程同步降壓普樂士LDO控制器和200mA LDO的板載 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 148K |
| 代理商： | IRU3018 |
4
Rev. 1.5
07/24/01
IRU3018
This pin is connected to the 12 V supply and serves as the power Vcc pin for the output
drivers. A high frequency capacitor (typically 1
μ
F) must be placed close to this pin and
PGnd pin and be connected directly from this pin to the ground plane for the noise free
operation.
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 2.0V 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 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 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.
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 Vsen1 pin is more than
10% above the DAC voltage setting.
5V supply voltage. A high frequency capacitor (0.1 to 1
μ
F) must be placed close to this
pin and connected from this pin to the ground plane for noise free operation.
This pin provides the soft start for the switching regulator. An internal resistor charges an
external capacitor that is connected from 5V supply to this pin which ramps up the out-
puts of the switching regulators, preventing the outputs from overshooting as well as
limiting the input current. The second function of the Soft Start cap is to provide long off
time (HICCUP) for the synchronous MOSFET during current limiting.
PIN DESCRIPTIONS
PIN# PIN SYMBOL PIN DESCRIPTION
1
V12
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
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.05
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
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
Table 1 - Set point voltage vs. VID codes
2
3
4
5
6
7
8
9
Vid4
Vid3
Vid2
Vid1
Vid0
PGood
V5
SS
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