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| 型号： | LTC1879EGN |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.2A 16SSOP |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 10 V |
| 输入电压： | 2.65 V ~ 10 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 550kHz |
| 电流 - 输出： | 1.2A |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SSOP |
LTC1879
APPLICATIO S I FOR ATIO
PC Board Layout Checklist
As with all high frequency switchers, when considering
layout, care must be taken in order to achieve optimal
electrical, thermal and noise performance. Figure 8 is a
sample of PC board layout for the design example shown
in Figure 9. A 4-layer PC board is used in this design.
Several guidelines are followed in this layout:
1. In order to minimize switching noise and improve
output load regulation, the PGND pins of the LTC1879
should be connected directly to 1) the negative terminal
of the output decoupling capacitors, 2) the negative
terminal of the input capacitor and 3) vias to the ground
plane immediately adjacent to Pins 1, 7 and 10. The
ground trace on the top layer of the PC board should be
as wide and short as possible to minimize series resis-
tance and inductance.
2. Beware of ground loops in multiple layer PC boards. Try
to maintain one central ground node on the board and
use the input capacitor to avoid excess input ripple for
high output current power supplies. If the ground is to
be used for high DC currents, choose a path away from
the small-signal components.
VIAS TO GND PLANE
3. The high di/dt loop from the top terminal of the input
capacitor, through the power MOSFETs and back to the
input capacitor should be kept as tight as possible to
reduce inductive ringing. Excess inductance can cause
increased stress on the power MOSFET and increase
noise on the input. If low ESR ceramic capacitors are
used to reduce input noise, place these capacitors close
to the DUT in order to keep the series inductance to a
minimum.
4. Place the small-signal components away from high
frequency switching nodes. In the layout shown in
Figure 8, all of the small-signal components have been
placed on one side of the IC and all of the power
components have been placed on the other.
5. For optimum load regulation and true sensing, the top
of the output resistor divider should connect indepen-
dently to the top of the output capacitor (Kelvin connec-
tion), staying away from any high dV/dt traces. Place
the divider resistors near the LTC1879 in order to keep
the high impedance FB node short.
C C1
R C
C C2
C PL
R PL
R SVIN
VIA CONNECTION TO R FB1
C SS
R PG
R SS
R FB2
R FB1
C IN1
C IN2
DUT
C OUT
L1
V IN
PGND
V OUT
1879 F08
VIAS TO GND PLANE
Figure 8. Typical Application and Suggested Layout (Topside Only)
1879f
15
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相关代理商/技术参数 |
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| LTC1879EGN#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.2A 16SSOP 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 |
| LTC1879EGN#TR | 功能描述:IC REG BUCK SYNC ADJ 1.2A 16SSOP RoHS:否 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 |
| LTC1879EGN#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1.2A 16SSOP 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 |
| LTC1879EGNPBF | 制造商:Linear Technology 功能描述:1.2A Synch Buck Regulator 15uA IQ SSOP16 |
| LTC1909-8EG | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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