参数资料
型号: LT3957EUHE#PBF
厂商: Linear Technology
文件页数: 22/28页
文件大小: 0K
描述: IC REG MULTI CONFIG ADJ 36VQFN
特色产品: LT?3957/LT?3958 Converters
标准包装: 61
类型: 升压(升压),反相,回扫,Sepic
输出类型: 可调式
输出数: 1
输出电压: 1.6 V ~ 40 V
输入电压: 3 V ~ 40 V
PWM 型: 电流模式
频率 - 开关: 100kHz ~ 1MHz
电流 - 输出: 5A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 36-WFQFN 裸露焊盘
包装: 管件
供应商设备封装: 36-QFN-EP(6x5)
LT3957
APPLICATIONS INFORMATION
? In ?yback con?guration, the high di/dt primary loop
contains the input capacitor, the primary winding, the
internal power MOSFET. The high di/dt secondary loop
contains the output capacitor, the secondary winding
and the output diode.
? In SEPIC con?guration, the high di/dt loop contains
the internal power MOSFET, output capacitor, Schottky
diode and the coupling capacitor.
? In inverting con?guration, the high di/dt loop contains
internal power MOSFET, Schottky diode and the coupling
capacitor.
Check the stress on the internal power MOSFET by measur-
ing the SW-to-GND voltage directly across the IC terminals.
Make sure the inductive ringing does not exceed the
maximum rating of the internal power MOSFET (40V).
The small-signal components should be placed away from
high frequency switching nodes. For optimum load regula-
tion and true remote sensing, the top of the output voltage
sensing resistor divider should connect independently to
the top of the output capacitor (Kelvin connection), staying
away from any high dV/dt traces. Place the divider resis-
tors near the LT3957 in order to keep the high impedance
FBX node short.
Figure 9 shows the suggested layout of the 4.5V to16V
input, 24V output boost converter in the Typical Applica-
tion section.
R1
C SS
VIA TO V OUT
R2
1
2
R T
36 35 34 33 32 31 30
R C
28
27
C C
C VCC
3
4
6
8
9
37
LT3957
38
25
24
23
21
20
R4
R3
10
12 13 14 15 16 17
L1
C OUT
C OUT
D1
C IN
GND
V OUT
VIA TO V OUT
V IN
3958 F09
VIAS TO SGND GROUND PLANE
VIAS TO SW PLANE
Figure 9. Suggested Layout of the 4.5V to 16V Input. 24V Output Boost Converter in the Typical Application Section
3957f
22
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LT3957EUHETRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch
LT3957IUHE#PBF 功能描述:IC REG MULTI CONFIG ADJ 36VQFN 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
LT3957IUHE#TRPBF 功能描述:IC REG MULTI CONFIG ADJ 36VQFN 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
LT3957IUHEPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch
LT3957IUHETRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch