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参数资料
| 型号： | LTC3416EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 20TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
LTC3416
APPLICATIO S I FOR ATIO
coincidentally or ratiometrically track another output volt-
age as shown in Figure 3.
If the voltage on the TRACK pin is less than 0.8V, voltage
tracking is enabled. During voltage tracking, the output
voltage regulates to the tracking voltage through a resistor
divider network. The output voltage during tracking can be
calculated with the following equation:
selected the same as that of V OUT1 ’s resistor divider. To
implement the ratiometric sequencing in Figure 3b, the
extra resistor divider’s ratio should be set so that the
TRACK pin voltage exceeds 1.05V by the end of the start-
up period. The LTC3416 utilizes a method in which the
TRACK pin’s control over the output voltage is gradually
released as the TRACK pin voltage approaches 0.8V. With
this technique, some overdrive will be required on the
V OUT = V TRACK ? 1 +
? , V TRACK < 0.8V
?
?
R 2 ?
R 1 ?
TRACK pin to ensure that the tracking function is com-
pletely disabled at the end of the start-up period.
R 4 = R 3 ? OUT 2 – 1 ?
Voltage tracking can be accomplished by sensing a frac-
tion of the output voltage from another regulator. This is
typically done by using a resistor divider to attenuate the
output voltage that is being tracked. Setting this attenua-
tion factor equal to the reciprocal of the gain factor
provided by the feedback resistors will force the regulator
outputs to be equal to each other during tracking. If
tracking is not desired, connect the TRACK pin to SV IN .
To implement the coincident tracking shown in Figure 3a,
connect an extra resistor divider to the output of V OUT2 and
connect its midpoint to the TRACK pin of the LTC3416 as
shown in Figure 4. The ratio of this divider should be
V OUT2
V OUT1
For coincident tracking, the following condition should be
satisfied to ensure that tracking is disabled at the end of
start-up.
V OUT2 ≥ 1.32 V OUT1
For ratiometric tracking, the following equation can be
used to calculate the resistor values:
? V ?
? V TRACK ?
V TRACK ≥ 1 . 05 V
V OUT2
V OUT1
TIME
TIME
3416 F03
(3a) Coincident Tracking
(3b) Ratiometric Sequencing
Figure 3. Two Different Modes of Output Voltage Sequencing
V OUT2
TO
TRACK
PIN
R4
R3
R2
R1
TO
V FB(MASTER)
PIN
3416 F04
Figure 4. Setup for Tracking and Ratiometric Sequencing
3416fa
10
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