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参数资料
| 型号： | LTC3615EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A DL 24QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 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： | 400kHz ~ 4MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 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（4x4） |
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LTC3615/LTC3615-1
APPLICATIONS INFORMATION
Output Voltage Tracking Input
If SRLIM is low, once V TRACK/SS reaches or exceeds 0.6V
the run state is entered, and the MODE selection, power
good and current foldback circuits are enabled.
In the run state, the TRACK/SS pin can be used to track
down/up the output voltage of another supply. If the V TRACK/
SS again drops below 0.6V, the LTC3615 enters the down-
tracking state and the V OUT is referenced to the TRACK/
SS voltage. If V TRACK/SS reaches 0.1V value the switching
frequency is reduced by 4x to ensure that the minimum
duty cycle limit does not prevent the output from following
the TRACK/SS pin. The run state will resume if the V TRACK/
SS again exceeds 0.6V and the V OUT is referenced to the
internal reference.
V OUT1
V OUT2
Through the TRACK/SS pin, the output voltage can be set
up to either coincidental or ratiometric tracking, as shown
in Figures 8 and 9.
To implement the coincidental tracking waveform in
Figure 8, 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 the same as that of the slave
channel’s feedback divider (Figure 10).
In this tracking mode, the master channel’s output must
be set higher than slave channel’s output. To implement
the ratiometric start-up in Figure 9, no extra divider is
needed; simply connect the TRACK/SS pin to the other
channel’s V FB pin (Figure 12).
V OUT1
V OUT2
TIME
3615 F08
TIME
3615 F09
Figure 8. Coincident Start-Up Tracking
V OUT1
Figure 9. Ratiometric Start-Up Tracking
V OUT1
R1
V OUT1
R3
R1
LTC3615
R2
LTC3615
R1
LTC3615
FB1
FB1
FB1
R4
R2
R3
R2
TRACK/SS2
V OUT2
R5
FB2
R6
3615 F10
Figure 10. Set for Coincidentally
Tracking (R3 = R5, R4 = R6)
22
TRACK/SS2
V OUT2
R4
FB2
R5
3615 F11
Figure 11. Alternative Set-Up for Coincident
Start-Up Tracking (R1 = R3, R2 = R3 = R5)
For more information www.linear.com/LTC3615
TRACK/SS2
V OUT2
R3
FB2
R4
3615 F12
Figure 12. Set-Up for
Ratiometric Tracking
3615fb
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