收藏本站
LTM8048
APPLICATIONS INFORMATION
V OUT1
C OUT1
PCBLayout
Most of the headaches associated with PCB layout have
been alleviated or even eliminated by the high level of
integration of the LTM8048. The LTM8048 is neverthe-
less a switching power supply, and care must be taken to
minimize electrical noise to ensure proper operation. Even
with the high level of integration, you may fail to achieve
specified operation with a haphazard or poor layout. See
Figure 1 for a suggested layout. Ensure that the grounding
and heat sinking are acceptable.
ADJ1
LTM8048
SS
BIAS
GND
V OUT–
RUN
ADJ2 BYP
C OUT2
V OUT2 C IN V IN
THERMAL/INTERCONNECT VIAS
8048 F01
Figure 1. Layout Showing Suggested External Components,
Planes and Thermal Vias
A few rules to keep in mind are:
1. Place the R ADJ1 and R ADJ2 resistors as close as possible
to their respective pins.
2. Place the C IN capacitor as close as possible to the V IN
and GND connections of the LTM8048.
3. Place the C OUT1 capacitor as close as possible to V OUT1
and V OUT– . Likewise, place the C OUT2 capacitor as close
as possible to V OUT2 and V OUT– .
4. Place the C IN and C OUT capacitors such that their
ground current flow directly adjacent or underneath
the LTM8048.
5. Connect all of the GND connections to as large a copper
pour or plane area as possible on the top layer. Avoid
breaking the ground connection between the external
components and the LTM8048.
6. Use vias to connect the GND copper area to the board’s
internal ground planes. Liberally distribute these GND
vias to provide both a good ground connection and
thermal path to the internal planes of the printed circuit
board. Pay attention to the location and density of the
thermal vias in Figure 1. The LTM8048 can benefit from
the heat sinking afforded by vias that connect to internal
GND planes at these locations, due to their proximity
to internal power handling components. The optimum
number of thermal vias depends upon the printed
circuit board design. For example, a board might use
very small via holes. It should employ more thermal
vias than a board that uses larger holes.
Hot-Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of the LTM8048. However, these capaci-
tors can cause problems if the LTM8048 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 underdamped tank circuit, and the volt-
age at the V IN pin of the LTM8048 can ring to more than
twice the nominal input voltage, possibly exceeding the
LTM8048’s rating and damaging the part. A similar phe-
nomenon can occur inside the LTM8048 module, at the
output of the integrated EMI filter, with the same potential
of damaging the part. If the input supply is poorly con-
trolled or the user will be plugging the LTM8048 into an
energized supply, the input network should be designed
to prevent this overshoot. This can be accomplished by
installing a small resistor in series to V IN , but the most
popular method of controlling input voltage overshoot is
adding an electrolytic bulk capacitor to the V IN or f IN net.
This capacitor’s relatively high equivalent series resistance
damps the circuit and eliminates the voltage overshoot.
The extra capacitor improves low frequency ripple filter-
ing and can slightly improve the efficiency of the circuit,
though it can be a large component in the circuit.
8048ff
For more information www.linear.com/LTM8048
13
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LTM8052AEV#PBF IC UMODULE 36VIN 5A CVCC 81LGA
M30R224K5 CAP CER 0.22UF 50V 10% RADIAL
M39014/22-0709 CAP CER 1000PF 100V 1% RADIAL
M41L0Q1U JOYSTICK MINI 3AXIS W/BUTTON
M57140-01 CONV DC/DC ISO FOR IPM MOD
M57182N-315 CONV DC/DC HI-VOLT INPUT
M57184N-715B CONV DC-DC STPDWN IPM 9-SIP
M7LXK-5010K IDC CABLE - MDH50K/MC50F/X
相关代理商/技术参数
LTM8048MPY#PBF 制造商:Linear Technology 功能描述:DC/DC CONVERTER ISOLATED FB UMODULE BG 制造商:Linear Technology 功能描述:DC/DC CONVERTER, ISOLATED FB UMODULE, BG
LTM8050EY#PBF 制造商:Linear Technology 功能描述:DC/DC CONVERTER 0.8-24V 48W 制造商:Linear Technology 功能描述:BUCK UMODULE 58VIN 2A 2.4M 制造商:Linear Technology 功能描述:BUCK, UMODULE, 58VIN, 2A, 2.4MHZ, BGA-70 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, BGA-70, Primary Input Voltage:58V, No. of Outputs:1, 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, BGA-70, Primary Input Voltage:58V, No. of Outputs:1, Output Current:2A, No. of Pins:70, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 3 - 168 hours, Package / Case:70-BGA , RoHS Compliant: Yes
LTM8050IY#PBF 制造商:Linear Technology 功能描述:DC/DC CONVERTER 0.8-24V 48W 制造商:Linear Technology 功能描述:BUCK UMODULE 58VIN 2A 2.4M 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, BGA-70, Primary Input Voltage:58V, No. of Outputs:1,
LTM8050MPY#PBF 制造商:Linear Technology 功能描述:DC/DC CONVERTER 0.8-24V 48W 制造商:Linear Technology 功能描述:BUCK UMODULE 58VIN 2A 2.4M 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, BGA-70, Primary Input Voltage:58V, No. of Outputs:1,
LTM8052 制造商:LINER 制造商全称:Linear Technology 功能描述:36VIN, 5A, 2-Quadrant CVCC Step-Down
LTM8052AEV#PBF 功能描述:IC UMODULE 36VIN 5A CVCC 81LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:* 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:66V 电压 - 输入（最大）:160V Voltage - Output 1:12V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:50W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:*
LTM8052AIV#PBF 功能描述:IC UMODULE 36VIN 5A CVCC 81LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:* 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:55V 电压 - 输入（最大）:100V Voltage - Output 1:5.8V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:100W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9 针半砖 BusMod 尺寸/尺寸:2.36" L x 2.28" W x 1.08" H（59.9mm x 57.9mm x 27.4mm） 包装:散装 工作温度:-25°C ~ 100°C 效率:* 电源（瓦特）- 最大:*
LTM8052EV#PBF 功能描述:IC DC/DC UMODULE BUCK 5A 81LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:66V 电压 - 输入（最大）:160V Voltage - Output 1:12V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:50W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:*