参数资料
| 型号： | LTC3819EG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR STEP DOWN 36-SSOP |
| 标准包装： | 2,000 |
| 应用： | 控制器，Sun 服务器 |
| 输入电压： | 4 V ~ 36 V |
| 输出数： | 1 |
| 输出电压： | 1.03 V ~ 1.41 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
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LTC3819
APPLICATIO S I FOR ATIO
Output Voltage
Table 1. VID Output Voltage Programming
The LTC3819 has a true remote voltage sense capablity.
The sensing connections should be returned from the load
back to the differential amplifier’s inputs through a com-
mon, tightly coupled pair of PC traces. The differential
amplifier corrects for DC drops in both the power and
ground paths. The differential amplifier output signal is
divided down and compared with the internal precision
0.6V voltage reference by the error amplifier.
Output Voltage Programming
The output voltage is digitally programmed as defined in
Table 1 using the VID0 to VID4 logic input pins. The VID
logic inputs program a precision, 0.25% internal feedback
resistive divider. The LTC3819 has an output voltage range
of 1.025V to 1.4125V in 12.5mV steps.
Between the ATTENOUT pin and ground is a variable
resistor, R1, whose value is controlled by the five VID input
pins (VID0 to VID4). Another resistor, R2, between the
ATTENIN and the ATTENOUT pins completes the resistive
divider. The output voltage is thus set by the ratio of
(R1 + R2) to R1.
Each VID digital input is pulled up by a 40k resistor in series
with a diode from V BIAS . Therefore, it must be grounded to
get a digital low input, and can be either floated or con-
nected to V BIAS to get a digital high input. The series diode
is used to prevent the digital inputs from being damaged
or clamped if they are driven higher than V BIAS . The digital
inputs accept CMOS voltage levels.
V BIAS is the supply voltage for the VID section. It is
normally connected to INTV CC but can be driven from
other sources. If it is driven from another source, that
source must be in the range of 2.7V to 5.5V and must be
alive prior to enabling the LTC3819.
CODE
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
VID4
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
VID3
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
VID2
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
VID1
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
VID0
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
OUTPUT
1.4125V
1.4000V
1.3875V
1.3750V
1.3625V
1.3500V
1.3375V
1.3250V
1.3125V
1.3000V
1.2875V
1.2750V
1.2625V
1.2500V
1.2375V
1.2250V
1.2125V
1.2000V
1.1875V
1.1750V
1.1625V
1.1500V
1.1375V
1.1250V
1.1125V
1.1000V
1.0875V
1.0750V
1.0625V
1.0500V
1.0375V
1.0250V
3819f
18
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