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参数资料
| 型号： | LTC3614EUDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/30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： | 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（3x5） |
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LTC3614
APPLICATIONS INFORMATION
SV IN
t SS = R SS ? C SS ? ln ? ?
DDRMode
The LTC3614 can both source and sink current if the MODE
pin is configured to forced continuous mode.
Current sinking is typically limited to 3A for 1MHz frequency
and a 0.47μH inductor, but can be lower at higher frequen-
cies and low output voltages. If higher ripple current can
be tolerated, smaller inductor values can increase the sink
current limit. See the Typical Performance Characteristics
curves for more information.
In addition, by tying the SRLIM/DDR pin to SV IN , lower
external reference voltage and tracking output voltage are
possible. See the Output Voltage Tracking and External
Reference Input sections.
Soft-Start
The RUN pin provides a means to shut down the LTC3614.
Tying the RUN pin to SGND places the LTC3614 in a low
quiescent current shutdown state (I Q < 1μA).
The LTC3614 is enabled by pulling the RUN pin high.
However, the applied voltage must not exceed SV IN . In
some applications the RUN signal is generated within
another power domain and is driven high while the SV IN
and PV IN are still 0V. In this case, it’s required to limit
the current into the RUN pin by either adding a 1M?
resistor or a 100k resistor plus a Schottky diode to SV IN .
After pulling the RUN pin high the chip enters a soft start-up
state. The type of soft start-up behavior is set by the
TRACK/SS pin:
1. Tying TRACK/SS to SV IN selects the internal soft-start
circuit. This circuit ramps the output voltage to the final
value within 1ms.
2. If a longer soft-start period is desired, it can be set
externally with a resistor and capacitor on the TRACK/
SS pin as shown in Figure 1. The TRACK/SS pin reduces
the value of the internal reference at V FB until TRACK/
SS is pulled above 0.6V. The external soft-start duration
can be calculated by using the following formula:
? ?
? SV IN – 0.6V ?
3. The TRACK/SS pin can be used to track the output
voltage of another supply.
Each time the RUN pin is tied high and the LTC3614 is
turned on, the TRACK/SS pin is internally pulled down
for ten microseconds in order to discharge the external
capacitor. This discharging time is typically adequate
for capacitors up to about 33nF. If a larger capacitor is
required, connect the external soft-start resistor to the
RUN pin.
10k
100k
OPEN
OPEN
100k
10k
V IN = 3.3V
V OUT = 1.8V
f SW = 2.25MHz
2ns/DIV
V IN = 3.3V
V OUT = 1.8V
f SW = 2.25MHz
2ns/DIV
3614 F05
Figure 5. Slew Rate at SW Pin vs SRLIM/DDR Resistor: Open, 100k, 10k
19
For more information www.linear.com/LTC3614
3614fb
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| LTC3614MPUDD#TRPBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN |
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