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| 型号： | LTC3809EMSE-1 |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 10-MSOP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 100% |
| 电源电压： | 2.75 V ~ 9.8 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
LTC3809-1
APPLICATIONS INFORMATION
For most applications, a 59k resistor is suggested for R A .
In applications where minimizing the quiescent current is
critical, R A should be made bigger to limit the feedback
divider current. If R B then results in very high impedance,
it may be bene?cial to bypass R B with a 50pF to 100pF
capacitor C FF .
V OUT
Once the controller is enabled, the start-up of V OUT is con-
trolled by the state of the TRACK/SS pin. If the TRACK/SS
pin is connected to V IN , the start-up of V OUT is controlled
by internal soft-start, which slowly ramps the positive
reference to the error ampli?er from 0V to 0.6V, allowing
V OUT to rise smoothly from 0V to its ?nal value. The default
internal soft-start time is around 0.74ms. The soft-start
time can be changed by placing a capacitor between the
LTC3809-1
R B
C FF
TRACK/SS pin and GND. In this case, the soft-start time
will be approximately:
V FB
R A
38091 F03
t SS = C SS ?
600mV
1 μ A
Figure 3. Setting Output Voltage
Run and Soft-Start/Tracking Functions
The LTC3809-1 has a low power shutdown mode which is
controlled by the RUN pin. Pulling the RUN pin below 1.1V
puts the LTC3809-1 into a low quiescent current shutdown
mode (I Q = 9μA). Releasing the RUN pin, an internal 0.7μA
where 1μA is an internal current source which is always on.
When the voltage on the TRACK/SS pin is less than the
internal 0.6V reference, the LTC3809-1 regulates the V FB
voltage to the TRACK/SS pin voltage instead of 0.6V.
Therefore the start-up of V OUT can ratiometrically track
an external voltage V X , according to a ratio set by a resis-
tor divider at TRACK/SS pin (Figure 5a). The ratiometric
relation between V OUT and V X is (Figure 5c):
= TA ?
(at V IN = 4.2V) current source will pull the RUN pin up
to V IN , which enables the controller. The RUN pin can be
driven directly from logic as showed in Figure 4.
V OUT
V X
R
R A
R A + R B
R TA + R TB
V OUT
3.3V OR 5V
V X
LTC3809-1
RUN
LTC3809-1
RUN
R TB
LTC3809-1
V FB
TRACK/SS
R B
R A
38091 F04
R TA
38091 F5a
Figure 4. RUN Pin Interfacing
Figure 5a. Using the TRACK/SS Pin to Track V X
38091fc
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3809EMSE-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3809EMSE-1#TR | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3809EMSE-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3809IDD-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3809IDD-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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