- 您现在的位置：买卖IC网 > PDF目录13913 > LT3695HMSE#PBF (Linear Technology)IC REG BUCK ADJ 1A 16MSOP PDF资料下载
参数资料
| 型号： | LT3695HMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/30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 ~ 150°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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
LT3695 Series
APPLICATIONS INFORMATION
A good choice of switching frequency should allow an
adequate input voltage range (see Input Voltage Range sec-
tion) and keep the inductor and capacitor values small.
Input Voltage Range
The minimum input voltage is determined by either the
LT3695 regulators’ minimum operating voltage of ~3.6V
(V BD > 3V) or by their maximum duty cycle (see equation
in Operating Frequency Trade-Offs section). The minimum
input voltage due to duty cycle is:
input voltage. Conversely, a lower switching frequency
will be necessary to achieve optimum operation at high
input voltages.
Special attention must be paid when the output is in
start-up, short-circuit or other overload conditions. Dur-
ing these events, the inductor peak current might easily
reach and even exceed the maximum current limit of
the LT3695 regulators, especially in those cases where
the switch already operates at minimum on-time. The
circuitry monitoring the current through the catch diode
V IN ( MIN ) =
V OUT + V D
1 ? f SW t OFF ( MIN )
? V D + V SW
via the DA pin prevents the switch from turning on again
if the inductor valley current is above 1.6A nominal. In
these cases, the inductor peak current is therefore the
V IN ( MAX ) ? V OUT ( OL )
I L ( PEAK ) = 2 A + ? t ON ( MIN )
whereV IN(MIN) istheminimuminputvoltage,andt OFF(MIN)
is the minimum switch off time. Note that a higher switch-
ing frequency will increase the minimum input voltage.
If a lower dropout voltage is desired, a lower switching
frequency should be used.
The maximum input voltage for LT3695 regulator applica-
tions depends on switching frequency, the absolute maxi-
mum ratings of the V IN and BOOST pins and the operating
mode. The LT3695 regulators can operate from continuous
input voltages up to 36V. Input voltage transients of up to
60V are also safely withstood. However, note that while
V IN > V OVLO (overvoltage lockout, 38V typical), the LT3695
regulators will stop switching, allowing the output to fall
out of regulation.
For a given application where the switching frequency
and the output voltage are already ?xed, the maximum
input voltage that guarantees optimum output voltage
ripple for that application can be found by applying the
following expression:
maximum current limit of the LT3695 regulators plus the
additional current overshoot during the turn off delay due
to minimum on time:
L
where I L(PEAK) is the peak inductor current, V IN(MAX) is
the maximum expected input voltage, L is the inductor
value, t ON(MIN) is the minimum on time and V OUT(OL) is the
output voltage under the overload condition. The parts are
robust enough to survive prolonged operation under these
conditions as long as the peak inductor current does not
exceed 3.5A. Inductor current saturation and excessive
junction temperature may further limit performance.
Input voltage transients of up to V OVLO are acceptable
regardless of the switching frequency. In this case, the
LT3695 regulators may enter pulse-skipping operation
where some switching pulses are skipped to maintain
output regulation. In this mode the output voltage ripple
and inductor current ripple will be higher than in normal
f SW ON ( MIN )
V IN ( MAX ) =
t
V OUT + V D
? V D + V SW
operation.
Input voltage transients above V OVLO and up to 60V can
where V IN(MAX) is the maximum operating input voltage,
V OUT is the output voltage, V D is the catch diode drop
(~0.5V), V SW is the internal switch drop (~0.5V at max load),
f SW is the switching frequency (set by R T ) and t ON(MIN) is
the minimum switch on time (~150ns). Note that a higher
switching frequency will reduce the maximum operating
be tolerated. However, since the parts will stop switching
during these transients, the output will fall out of regulation
and the output capacitor may eventually be completely
discharged. This case must be treated then as a start-up
condition as soon as V IN returns to values below V OVLO
and the part starts switching again.
3695fa
13
相关PDF资料 |
PDF描述 |
|---|---|
| V300B5C150B2 | CONVERTER MOD DC/DC 5V 150W |
| LT1959CS8 | IC REG BUCK ADJ 4.5A 8SOIC |
| EYM24DTAD-S189 | CONN EDGECARD 48POS R/A .156 SLD |
| LT3689HMSE-5#PBF | IC REG BUCK 5V 0.7A 16MSOP |
| MAX6724AUTRDD2+T | IC SUPERVISOR MPU SOT23-6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3695HMSETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Fault Tolerant Micropower Step-Down Regulator |
| LT3695IMSE#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 |
| LT3695IMSE#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 |
| LT3695IMSE-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 |
| LT3695IMSE-3.3#TRPBF | 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 |
发布紧急采购，3分钟左右您将得到回复。