- 您现在的位置：买卖IC网 > PDF目录15503 > LTC1622IS8#PBF (Linear Technology)IC REG CTRLR BUCK PWM CM 8-SOIC PDF资料下载
参数资料
| 型号： | LTC1622IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 8-SOIC |
| 标准包装： | 100 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 625kHz |
| 占空比： | 100% |
| 电源电压： | 2 V ~ 10 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： | -45°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
LTC1622
APPLICATIO N S I N FOR M ATIO N
R DS ( ON ) ?
= 0 . 11 ?
( ) ( ) p δ
1 +
down to 2.7V. Let’s assume that the MOSFET dissipation
is to be limited to P P = 250mW and its thermal resistance
is 50 ° C/W. Hence the junction temperature at T A = 25 ° C
will be 37.5 ° C and δ p = 0.005 (37.5 – 25) = 0.0625. The
required R DS(ON) is then given by:
P P
2
DC I OUT
The P-channel MOSFET requirement can be met by an
Si6433DQ.
The requirement for the Schottky diode is the most strin-
gent when V OUT = 0V, i.e., short circuit. With a 0.025 ?
R SENSE resistor, the short-circuit current through the
Schottky is 0.1/0.025 = 4A. An MBRS340T3 Schottky
diode is chosen. With 4A flowing through, the diode is
rated with a forward voltage of 0.4V. Therefore, the worst-
case power dissipated by the diode is 1.6W. The addition
of D FB (Figure 5) will reduce the diode dissipation to
approximately 0.8W.
The input capacitor requires an RMS current rating of at
least 0.75A at temperature, and C OUT will require an ESR
of 0.1 ? for optimum efficiency.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1622. These items are illustrated graphically in the
layout diagram in Figure 6. Check the following in your
layout:
1. Is the Schottky diode closely connected between ground
at (–) lead of C IN and drain of the external MOSFET?
2. Does the (+) plate of C IN connect to the sense resistor
as closely as possible? This capacitor provides AC
current to the MOSFET.
3. Is the input decoupling capacitor (0.1 μ F) connected
closely between V IN (Pin 8) and ground (Pin 6)?
4. Connect the end of R SENSE as close to V IN (Pin 8) as
possible. The V IN pin is the SENSE + of the current
comparator.
5. Is the trace from the SENSE – (Pin 1) to the Sense
resistor kept short? Does the trace connect close to
R SENSE ?
6. Keep the switching node, SW, away from sensitive
small signal nodes.
7. Does the V FB pin connect directly to the feedback
resistors? The resistive divider R1 and R2 must be
connected between the (+) plate of C OUT and signal
ground. Optional capacitor C1 should be located as
close as possible to the LTC1622.
R1 and R2 should be located as close as possible to the
LTC1622. R2 should connect to the output as close to
the load as practicable.
R SENSE
+
C IN
V IN
R ITH
1
2
3
SENSE – V IN
I TH PDRV
LTC1622
V FB GND
8
7
6
0.1 μ F
M1
SW
L1
+
V OUT
C ITH
C1
4 RUN/
SS
SYNC/ 5
MODE
C OUT
C SS
QUIET SGND
R1
R2
1622 F06
BOLD LINES INDICATE HIGH CURRENT PATHS
Figure 6. LTC1622 Layout Diagram (See PC Board Layout Checklist)
12
相关PDF资料 |
PDF描述 |
|---|---|
| MIC2182-5.0YSM | IC REG CTRLR BUCK PWM CM 16-SSOP |
| SPD62-352M | INDUCTOR PWR SHIELDED 3.50UH SMD |
| SPD62-242M | INDUCTOR PWR SHIELDED 2.40UH SMD |
| URZ0J332MHD | CAP ALUM 3300UF 6.3V 20% RADIAL |
| UPM1A122MHD6 | CAP ALUM 1200UF 10V 20% RADIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1623CMS8 | 功能描述:IC HI-SIDE SW CNTRLR DUAL 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:5 系列:- 配置:低端 输入类型:非反相 延迟时间:600ns 电流 - 峰:12A 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:- 电源电压:14.2 V ~ 15.8 V 工作温度:-20°C ~ 60°C 安装类型:通孔 封装/外壳:21-SIP 模块 供应商设备封装:模块 包装:散装 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名称:835-1063 |
| LTC1623CMS8#PBF | 功能描述:IC HI-SIDE SW CNTRLR DUAL 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:50 系列:- 配置:高端 输入类型:非反相 延迟时间:200ns 电流 - 峰:250mA 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:600V 电源电压:12 V ~ 20 V 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-DIP 包装:管件 其它名称:*IR2127 |
| LTC1623CMS8#TR | 功能描述:IC CTRLR SW SMBUS DUAL 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:5 系列:- 配置:低端 输入类型:非反相 延迟时间:600ns 电流 - 峰:12A 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:- 电源电压:14.2 V ~ 15.8 V 工作温度:-20°C ~ 60°C 安装类型:通孔 封装/外壳:21-SIP 模块 供应商设备封装:模块 包装:散装 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名称:835-1063 |
| LTC1623CMS8#TRPBF | 功能描述:IC HI-SIDE SW CNTRLR DUAL 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:50 系列:- 配置:高端 输入类型:非反相 延迟时间:200ns 电流 - 峰:250mA 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:600V 电源电压:12 V ~ 20 V 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-DIP 包装:管件 其它名称:*IR2127 |
| LTC1623CS8 | 功能描述:IC HI-SIDE SW CNTRLR DUAL 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:5 系列:- 配置:低端 输入类型:非反相 延迟时间:600ns 电流 - 峰:12A 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:- 电源电压:14.2 V ~ 15.8 V 工作温度:-20°C ~ 60°C 安装类型:通孔 封装/外壳:21-SIP 模块 供应商设备封装:模块 包装:散装 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名称:835-1063 |
发布紧急采购，3分钟左右您将得到回复。