US3018CW Ver la hoja de datos (PDF) - Unisem
Número de pieza
componentes Descripción
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US3018CW Datasheet PDF : 17 Pages
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US3018
Enable Section
En pin input LO voltage
En pin input HI voltage
En pin input LO current
En pin input HI current
Venl
Venh
Regulator OFF
Regulator ON
Ven=0V to 0.8V
Ven=2V to 5V
0.8
V
2
V
0.01
uA
20
uA
D4 D3 D2 D1 D0 Vs
01
1
1
1
1.30
01
1
1
0
1.35
01
1
0
1
1.40
01
1
0
0
1.45
01
0
1
1
1.50
01
0
1
0
1.55
01
0
0
1
1.60
01
0
0
0
1.65
00
1
1
1
1.70
00
1
1
0
1.75
00
1
0
1
1.80
00
1
0
0
1.85
00
0
1
1
1.90
00
0
1
0
1.95
00
0
0
1
2.00
00
0
0
0
2.05
D4 D3 D2 D1 D0 Vs
1
1
1
1
1
2.0
1
1
1
1
0
2.1
1
1
1
0
1
2.2
1
1
1
0
0
2.3
1
1
0
1
1
2.4
1
1
0
1
0
2.5
1
1
0
0
1
2.6
1
1
0
0
0
2.7
1
0
1
1
1
2.8
1
0
1
1
0
2.9
1
0
1
0
1
3.0
1
0
1
0
0
3.1
1
0
0
1
1
3.2
1
0
0
1
0
3.3
1
0
0
0
1
3.4
1
0
0
0
0
3.5
PIN DESCRIPTIONS
Table 1 - Set point voltage vs. VID codes
PIN# PIN SYMBOL
6 VID0
5 VID1
4 VID2
3 VID3
2 VID4
7 PGOOD
18 FB1
Pin Description
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,his pin is pulled up internally
by a 27kΩ 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,his pin is pulled up internally
by a 27kΩ 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,his pin is pulled up internally
by a 27kΩ 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,his pin is pulled up
internally by a 27kΩ resistor to 5V supply.
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,his
pin is pulled up internally by a 27kΩ 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.
This pin provides the feedback for the synchronous switching regulator. Typically this
pin can be connected directly to the output of the switching regulator. However, a
resistor divider is recommended to be connected from this pin to vout1 and GND to
adjust the output voltage for any drop in the output voltage that is caused by the trace
resistance. The value of the resistor connected from Vou1 to FB1 must be less than
100Ω.
4-4
Rev. 1.4
12/8/00
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