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| 型号： | LT3972IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 10DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.79 V ~ 30 V |
| 输入电压： | 3.6 V ~ 33 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 230kHz ~ 2.45MHz |
| 电流 - 输出： | 3.5A |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LT3972
APPLICATIONS INFORMATION
Table 2. Capacitor Vendors
VENDOR
Panasonic
PHONE
(714) 373-7366
URL
www.panasonic.com
PART SERIES
Ceramic,
COMMANDS
Polymer,
Tantalum
EEF Series
Kemet
Sanyo
(864) 963-6300
(408) 749-9714
www.kemet.com
www.sanyovideo.com
Ceramic,
Tantalum
Ceramic,
Polymer,
T494, T495
POSCAP
Tantalum
Murata
AVX
Taiyo Yuden
(408) 436-1300
(864) 963-6300
www.murata.com
www.avxcorp.com
www.taiyo-yuden.com
Ceramic
Ceramic,
Tantalum
Ceramic
TPS Series
value of output capacitor can be used to save space and
cost but transient performance will suffer. See the Fre-
quency Compensation section to choose an appropriate
compensation network.
When choosing a capacitor, look carefully through the
data sheet to ?nd out what the actual capacitance is under
operating conditions (applied voltage and temperature).
A physically larger capacitor, or one with a higher voltage
typical peak switch current. Peak reverse voltage is equal
to the regulator input voltage. Use a Schottky diode with a
reverse-voltage rating greater than the input voltage. The
overvoltage protection feature in the LT3972 will keep the
switch off when V IN > 35V which allows the use of 40V
rated Schottky even when V IN ranges up to 62V. Table 3
lists several Schottky diodes and their manufacturers.
Table 3. Diode Vendors
rating, may be required. High performance tantalum or
electrolytic capacitors can be used for the output capacitor.
Low ESR is important, so choose one that is intended for
use in switching regulators. The ESR should be speci?ed
by the supplier, and should be 0.05Ω or less. Such a
capacitor will be larger than a ceramic capacitor and will
have a larger capacitance, because the capacitor must be
PART NUMBER
On Semiconductor
MBRA340
Diodes Inc.
PDS340
B340A
B340LA
V R
(V)
40
40
40
40
I AVE
(A)
3
3
3
3
V F AT 3A
(mV)
500
500
500
450
large to achieve low ESR. Table 2 lists several capacitor
vendors.
Catch Diode
The catch diode conducts current only during switch off
-time. Average forward current in normal operation can
be calculated from:
I D(AVG) = I OUT (V IN – V OUT )/V IN
where I OUT is the output load current. The only reason to
consider a diode with a larger current rating than necessary
for nominal operation is for the worst-case condition of
shorted output. The diode current will then increase to the
Ceramic Capacitors
Ceramic capacitors are small, robust and have very low
ESR. However, ceramic capacitors can cause problems
when used with the LT3972 due to their piezoelectric
nature. When in Burst Mode operation, the LT3972’s
switching frequency depends on the load current, and at
very light loads the LT3972 can excite the ceramic capaci-
tor at audio frequencies, generating audible noise. Since
the LT3972 operates at a lower current limit during Burst
Mode operation, the noise is nearly silent to a casual ear.
If this is unacceptable, use a high performance tantalum
or electrolytic capacitor at the output.
3972fa
12
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相关代理商/技术参数 |
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| LT3972IMSE#PBF | 功能描述:IC REG BUCK ADJ 3.5A 10MSOP 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 |
| LT3972IMSE#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A 10MSOP 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 |
| LT3972IMSEPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3.6-33V MSOP10 |
| LT3972IMSE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current |
| LT3972IMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current |
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