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参数资料
| 型号： | LT3695EMSE-3.3#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 1A 16MSOP |
| 标准包装： | 37 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 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 |
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LT3695 Series
OPERATION
The LT3695 series are constant-frequency, current mode
step-down regulators. An oscillator, with frequency set by
R T , enables an RS ?ip-?op, turning on the internal power
switch. An ampli?er and comparator monitor the current
?owing between the V IN and SW pins, turning the switch
off when this current reaches a level determined by the
voltage at V C . An error ampli?er measures the output
voltage through an external resistor divider tied to the FB
pin (LT3695) or through an internal resistor divider con-
nected to the output voltage (LT3695-3.3, LT3695-5), and
servos the V C pin. If the error ampli?er’s output increases,
more current is delivered to the output; if it decreases,
less current is delivered. An active clamp on the V C pin
provides current limit. The V C pin is also clamped to the
voltage on the RUN/SS pin; soft-start is implemented by
generating a voltage ramp at the RUN/SS pin using an
external resistor and capacitor.
An internal regulator provides power to the control circuitry.
The bias regulator normally draws power from the V IN pin,
but if the BD pin is connected to an external voltage higher
than 3V (LT3695) or if the output voltage connected to the
OUT 1 and OUT2 pins exceeds 3V (LT3695-3.3, LT3695-5),
bias power will be drawn from the external source. This
improves ef?ciency. The RUN/SS pin is used to place the
LT3695 regulators in shutdown, disconnecting the output
and reducing the input current to less than 1μA.
The switch driver operates from either the input or from
the BOOST pin. An external capacitor and the internal boost
diode are used to generate a voltage at the BOOST pin that
To further optimize ef?ciency, the LT3695 regulators au-
tomatically switch to Burst Mode operation in light load
situations. Between bursts, all circuitry associated with
controlling the output switch is shut down, reducing the
input supply current to 75μA in a typical application.
The oscillator reduces the LT3695 regulators’ operating
frequency when the voltage at the FB pin (LT3695) or the
OUT1,2 pins (LT3695-3.3, LT3695-5) is low. This frequency
foldback helps to control the output current during start-up
and overload conditions.
Internal circuitry monitors the current ?owing through the
catch diode via the DA pin and delays the generation of
new switch pulses if this current is too high (above 1.6A
nominal). This mechanism also protects the part during
short-circuit and overload conditions by keeping the cur-
rent through the inductor under control.
The LT3695 regulators contain a power good comparator
which trips when the FB pin (LT3695) or the OUT1,2 pins
(LT3695-3.3, LT3695-5) are at 90% of their regulated
value. The PG output is an open-collector transistor that
is off when the output is in regulation, allowing an external
resistor to pull the PG pin high. Power good is valid when
the LT3695 regulators are enabled and V IN is above the
minimum input voltage.
The LT3695 regulators have an overvoltage protection fea-
ture which disables switching action when V IN goes above
38V (typical) during transients. The LT3695 regulators can
then safely sustain transient input voltages up to 60V.
is higher than the input supply. This allows the driver to
fully saturate the internal bipolar NPN power switch for
ef?cient operation.
3695fa
11
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相关代理商/技术参数 |
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|---|---|
| LT3695EMSE-5#PBF | 功能描述:IC REG BUCK 5V 1A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3695EMSE-5#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR MSOP-16 |
| LT3695EMSE-5#TRPBF | 功能描述:IC REG BUCK 5V 1A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3695EMSEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Fault Tolerant Micropower Step-Down Regulator |
| LT3695EMSETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Fault Tolerant Micropower Step-Down Regulator |
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