- 您现在的位置：买卖IC网 > PDF目录13888 > LT3980IDE#PBF (Linear Technology)IC REG BUCK ADJ 2A 14DFN PDF资料下载
参数资料
| 型号： | LT3980IDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 14DFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.79 V ~ 52.2 V |
| 输入电压： | 3.6 V ~ 58 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 225kHz ~ 2.25MHz |
| 电流 - 输出： | 2A |
| 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： | 14-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
LT3980
APPLICATIONS INFORMATION
C2
C C
V IN pin. Figure 8 shows a circuit that will run only when
the input voltage is present and that protects against a
shorted or reversed input.
D4
MBRS360
V IN V IN BOOST
LT3980
RUN/SS SW V OUT
V C
GND FB
BACKUP
3980 F08
Figure 8. Diode D4 Prevents a Shorted Input from Discharging a
Backup Battery Tied to the Output. It Also Protects the Circuit from
a Reversed Input. The LT3980 Runs Only When the Input Is Present
PCB Layout
For proper operation and minimum EMI, care must be
taken during printed circuit board layout. Figure 9 shows
the recommended component placement with trace,
ground plane and via locations. Note that large, switched
currents flow in the LT3980’s V IN and SW pins, the catch
diode (D1) and the input capacitor (C1). The loop formed
by these components should be as small as possible. These
components, along with the inductor and output capacitor,
should be placed on the same side of the circuit board,
and their connections should be made on that layer. Place
a local, unbroken ground plane below these components.
The SW and BOOST nodes should be as small as possible.
Finally, keep the FB and V C nodes small so that the ground
traces will shield them from the SW and BOOST nodes.
The Exposed Pad on the bottom of the package must be
soldered to ground so that the pad acts as a heat sink. To
keep thermal resistance low, extend the ground plane as
much as possible, and add thermal vias under and near
the LT3980 to additional ground planes within the circuit
board and on the bottom side.
pacitors can cause problems if the LT3980 is plugged into
a live supply (see Linear Technology Application Note 88
for a complete discussion). The low loss ceramic capacitor,
combined with stray inductance in series with the power
source, forms an under damped tank circuit, and the
voltage at the V IN pin of the LT3980 can ring to twice the
nominal input voltage, possibly exceeding the LT3980’s
rating and damaging the part. If the input supply is poorly
controlled or the user will be plugging the LT3980 into an
energized supply, the input network should be designed
to prevent this overshoot. Figure 10 shows the waveforms
that result when an LT3980 circuit is connected to a 24V
supply through six feet of 24-gauge twisted pair. The
first plot is the response with a 4.7μF ceramic capacitor
at the input. The input voltage rings as high as 50V and
the input current peaks at 26A. A good solution is shown
in Figure 10b. A 0.7Ω resistor is added in series with the
input to eliminate the voltage overshoot (it also reduces
the peak input current). A 0.1μF capacitor improves high
frequency filtering. For high input voltages its impact on
efficiency is minor, reducing efficiency by 1.5 percent for
a 5V output at full load operating from 24V.
L1
V OUT
R RT
R C
R2
R1
D1 C1
GND R PG
Hot Plugging Safely
VIAS TO LOCAL GROUND PLANE
VIAS TO RUN/SS
VIAS TO V IN
3980 F09
VIAS TO V OUT
VIAS TO PG
VIAS TO SYNC
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LT3980 circuits. However, these ca-
OUTLINE OF LOCAL
GROUND PLANE
Figure 9. A Good PCB Layout Ensures Proper, Low EMI Operation
3980fa
For more information www.linear.com/LT3980
17
相关PDF资料 |
PDF描述 |
|---|---|
| LT3508HUF#TRPBF | IC REG BUCK ADJ 1.4A DL 24QFN |
| LT3480IMSE#TRPBF | IC REG BUCK ADJ 2A 10MSOP |
| LT1374CS8-5SYNC#TR | IC REG BUCK 5V 4.5A 8SOIC |
| LT1374CS8-SYNC#TR | IC REG BUCK ADJ 4.5A 8SOIC |
| LT3680EMSE#TRPBF | IC REG BUCK ADJ 3.5A 10MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3980IMSE#PBF | 功能描述:IC REG BUCK ADJ 2A 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 |
| LT3980IMSE#TRPBF | 功能描述:IC REG BUCK ADJ 2A 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 |
| LT3980IMSEPBF | 制造商:Linear Technology 功能描述:58V 2A 2.4MHz Buck Regulator 85uA MSOP16 |
| LT3988 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 60V Monolithic 1A Step-Down Switching |
| LT3988EMSE#PBF | 功能描述:IC REG BUCK ADJ 1A DL 16-MSOP 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 |
发布紧急采购，3分钟左右您将得到回复。