参数资料
型号: LTC3614EUDD#PBF
厂商: Linear Technology
文件页数: 21/30页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 4A 24QFN
标准包装: 73
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 5.5 V
输入电压: 2.25 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 300kHz ~ 4MHz
电流 - 输出: 4A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 24-WFQFN 裸露焊盘
包装: 管件
供应商设备封装: 24-QFN 裸露焊盘(3x5)
LTC3614
APPLICATIONS INFORMATION
To implement the coincident tracking behavior in Fig-
ure 6a, connect an extra resistive divider to the output
of the master channel and connect its midpoint to the
TRACK/SS pin for the slave channel. The ratio of this
divider should be selected to be the same as that of the
slave channel’s feedback divider (Figure 7a). In this track-
ing mode, the master channel’s output must be set higher
than slave channel’s output. To implement the ratiometric
tracking behavior in Figure 6b, different resistor divider
values must be used as specified in Figure 7b.
For coincident start-up, the voltage value at the TRACK/SS
pin for the slave channel needs to reach the final reference
value after the internal soft-start time (around 1ms). The
master start-up time needs to be adjusted with an external
capacitor and resistor to ensure this.
External Reference Input (DDR Mode)
If the DDR pin is tied to SV IN (DDR mode), the run state is
entered when V TRACK/SS exceeds 0.3V and tracking down
behavior is possible if the V TRACK/SS voltage is below 0.6V.
LTC3614
LTC3614
V OUT2
R4
R2
V OUT2
V OUT1
R4 R3
V FB2 V FB1
R2 R2
TRACK/SS2 TRACK/SS1
R4 ≤ R3
LTC3614 CHANNEL 2 LTC3614 CHANNEL 1
SLAVE MASTER
Figure 7a. Setup for Coincident Tracking
V OUT1
V IN
3614 F07a
This allows TRACK/SS to be used as an external reference
between 0.3V and 0.6V if desired. During the run state in
DDR mode, the power good window moves in relation
to the actual TRACK/SS pin voltage if the voltage value
is between 0.3V and 0.6V. Note: if TRACK/SS voltage is
0.6V, either the tracking circuit or the internal reference
can be used.
During up/down tracking the output current foldback is
disabled and the PGOOD pin is always pulled down (see
Figure 9).
R1
V FB2
R5
R3 R1/R2 < R5/R6
V FB1
R2
LTC3614
R6
R4
LTC3614
TRACK/SS2
LTC3614 CHANNEL 2
SLAVE
TRACK/SS1
LTC3614 CHANNEL 1
MASTER
V IN
3614 F07b
Figure 7b. Setup for Ratiometric Tracking
21
For more information www.linear.com/LTC3614
3614fb
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