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参数资料
| 型号： | LT3695EMSE-3.3#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 2420 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件页数： | 18/30页 |
| 文件大小： | 491K |
| 代理商： | LT3695EMSE-3.3#TRPBF |
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LT3695 Series
25
3695fa
APPLICATIONS INFORMATION
Table 8. LT3695-3.3, LT3695-5: Example Values for R3 and R4
for Common Combinations of VIN and VOUT. IR4 is the Current
Drawn by R4 in Normal Operation
VIN(MAX)
(V)
VIN(MIN)
(V)
VOUT
(V)
R3
(kΩ)
R4
(kΩ)
IR4
(μA)
16
5.3
3.3
309
None
24
5.3
3.3
365
215
15
36
5.3
3.3
365
66.5
50
16
7
5
267
None
24
7
5
464
None
36
7
5
590
442
11
The BOOST pin must not be shorted to a low impedance
node like VOUT that clamps its voltage. For best fault toler-
ance of the LT3695, supply current into the BD pin through
the Schottky diode D2 as shown in Figure 10. Note that
this diode must be able to handle the maximum output
current in case there is a short between the BD pin and
the GND pin.
A short between RUN/SS and SW may also increase the
output ripple. To suppress this, connect the soft-start
network consisting of RSS and CSS to RUN/SS as shown
in Figure 10. CSS should not be smaller than 0.22μF.
The SYNC pin must not be directly connected to either
ground or VIN. A short between RT and a SYNC pin that
is connected to VIN could violate the absolute maximum
ratings of the RT pin. A short between the SYNC pin and
the VIN pin could damage an external driver circuit which
may be connected to SYNC or would short VIN to ground
if SYNC is grounded.
VIN
LT3695
LT3695-3.3
LT3695-5
CS
100pF
RS
100k
SYNC
RT
VIN
3695 F13
RT
The recommended connection for SYNC is shown in
Figure 13. If SYNC is to be driven by an external circuitry,
RS may be used to isolate this circuitry from VIN. CS must
be used in this case to provide a low impedance path
for the synchronization signal. If SYNC is pulled low, RS
prevents VIN from being shorted to ground in case of
an inadvertent short between SYNC and VIN. If SYNC is
pulled high to VIN, then RS protects the RT pin during an
inadvertent short between SYNC and RT.
If the DA pin or the PGND pin are inadvertently left oat-
ing, the current path of the catch diode is interrupted
unless a bypass resistor is connected from DA to ground.
Use a 360mΩ (5% tolerance) resistor rated for a power
dissipation of:
P = I2LOAD(MAX) 0.36 (1 – DCMIN)
where ILOAD(MAX) is the maximum load current and DCMIN
is the minimum duty cycle. For example, this would require
a power rating of at least 219mW for an output current of
800mA and a minimum duty cycle of 5%. Make sure not
to exceed VIN(MAX) (see Input Voltage Range section for
details) during start-up or overload conditions.
Other Linear Technology Publications
Application Notes 19, 35 and 44 contain more detailed
descriptions and design information for buck regulators
and other switching regulators. The LT1376 data sheet
has a more extensive discussion of output ripple, loop
compensation and stability testing. Design Note 318
shows how to generate a bipolar output supply using a
buck regulator.
Figure 13. The Dashed Lines Show Where a Connection Would Occur
if There Were an Inadvertent Short from SYNC to an Adjacent Pin. In
This Case, RS Protects Circuitry Connecting to SYNC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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