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| 型号： | LT3695EMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 16MSOP |
| 标准包装： | 37 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 20 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 250kHz ~ 2.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
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LT3695 Series
APPLICATIONS INFORMATION
This reduces the minimum input voltage to approximately
300mV above V OUT . At higher load currents, the inductor
current is continuous and the duty cycle is limited by the
maximum duty cycle of the LT3695 regulators, requiring
a higher input voltage to maintain regulation.
Soft-Start
The RUN/SS pin can be used to soft-start the LT3695
regulators, reducing the maximum input current during
start-up. The RUN/SS pin is driven through an external
RC network to create a voltage ramp at this pin. Figure 6
shows the start-up and shutdown waveforms with the
soft-start circuit. By choosing a large RC time constant,
the peak start-up current can be reduced to the current
that is required to regulate the output, with no overshoot.
Choose the value of the resistor so that it can supply 7.5μA
when the RUN/SS pin reaches 2.5V. For fault tolerant ap-
plications, see the discussion of the RUN/SS resistor in
the Fault Tolerance section.
Synchronization
To select low ripple Burst Mode operation, tie the SYNC
pin below 0.3V (this can be ground or a logic output).
Synchronizing the oscillator of the LT3695 regulators to
an external frequency can be done by connecting a square
wave (with 20% to 80% duty cycle) to the SYNC pin. The
square wave amplitude should have valleys that are below
0.3V and peaks that are above 0.8V (up to 6V).
The LT3695 regulators will not enter Burst Mode operation
at low output loads while synchronized to an external clock,
but instead will skip pulses to maintain regulation.
The maximum load current that the part can supply is
reduced when a clock signal is applied to SYNC.
The LT3695 regulators may be synchronized over a 300kHz
to 2.2MHz range. The R T resistor should be chosen to set
the LT3695 regulators switching frequency 20% below the
lowest synchronization input. For example, if the synchro-
nization signal is 360kHz, the R T should be chosen for
300kHz. To assure reliable and safe operation the LT3695
regulators will only synchronize when the output voltage is
near regulation as indicated by the PG ?ag. It is therefore
necessary to choose a large enough inductor value to
supply the required output current at the frequency set
by the R T resistor. See the Inductor Selection section for
more information. It is also important to note that slope
compensation is set by the R T value; to avoid subharmonic
oscillations, calculate the minimum inductor value using
the frequency determined by R T .
Shorted and Reversed Input Protection
If the inductor is chosen so that it will not saturate exces-
sively, the LT3695 regulators will tolerate a shorted output.
When operating in short-circuit condition, the LT3695
regulators will reduce their frequency until the valley cur-
rent is at a typical value of 1.6A (see Figure 7). There is
another situation to consider in systems where the output
will be held high when the input to the LT3695 regulators is
absent. This may occur in battery charging applications or
in battery backup systems where a battery or some other
supply is diode ORed with the LT3695 regulators’ output.
If the V IN pin is allowed to ?oat and the RUN/SS pin is held
high (either by a logic signal or because it is tied to V IN ),
RUN
15k
RUN/SS
V RUN
5V/DIV
V RUN/SS
5V/DIV
V SW
20V/DIV
0V
0.22μF
GND
V OUT
5V/DIV
I L
500mA/DIV
I L
1A/DIV
5ms/DIV
3695 F05
0A
Figure 6. To Soft-Start the LT3695 Regulators,
2μs/DIV
3695 F07
Add a Resistor and Capacitor to the RUN/SS Pin
Figure 7. The LT3695 Regulators Reduce Their Frequency
to Protect Against Shorted Output with 36V Input
3695fa
20
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相关代理商/技术参数 |
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| LT3695EMSETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Fault Tolerant Micropower Step-Down Regulator |
| LT3695HMSE#PBF | 功能描述:IC REG BUCK ADJ 1A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3695HMSE#TRPBF | 功能描述:IC REG BUCK ADJ 1A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3695HMSE-3.3#PBF | 功能描述:IC REG BUCK 3.3V 1A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3695HMSE-3.3#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR MSOP-16 |
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