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| 型号： | LTC1148CS-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 14-SOIC |
| 标准包装： | 55 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 100% |
| 电源电压： | 3.5 V ~ 18 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： | 0°C ~ 70°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LTC1148
LTC1148-3.3/LTC1148-5
APPLICATIO S I FOR ATIO
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1148 series. These items are also illustrated graphi-
cally in the layout diagram of Figure 9. Check the following
in your layout:
1. Are the signal and power grounds segregated? The
LTC1148 signal ground Pin 11 must return to the (–)
plate of C OUT . The power ground returns to the
source of the N-channel MOSFET, anode of the
Schottky diode, and (–) plate of C IN , which should
have as short lead lengths as possible.
2. Does the LTC1148 SENSE – Pin 7 connect to a point
3. Are the SENSE – and SENSE + leads routed together
with minimum PC trace spacing? The 1000pF capacitor
between Pins 7 and 8 should be as close as possible to
the LTC1148.
4. Does the (+) plate of C IN connect to the source of the
P-channel MOSFET as closely as possible? This capaci-
tor provides the AC current to the P-channel MOSFET.
5. Is the 1 μ F V IN decoupling capacitor connected closely
between Pin 3 and power ground Pin 12? This capacitor
carries the MOSFET driver peak currents.
6. Is the Shutdown Pin 10 actively pulled to ground during
normal operation? The Shutdown pin is high imped-
ance and must not be allowed to float.
close to R SENSE and the (+) plate of C OUT ? In adjust-
able applications, the resistive divider R1, R2 must be
connected between the (+) plate of C OUT and signal
ground.
+
BOLD LINES INDICATE HIGH CURRENT PATHS
P-CHANNEL
D1
N-CHANNEL
C IN
V IN
–
1
2
P-DRIVE
NC
N-DRIVE
NC
14
13
1 μ F
3
4
V IN
C T
LTC1148
PGND
SGND
12
11
L
–
5
INTV CC
SHDN
10
SHUTDOWN
R1
6
I TH
NC (V FB )
9
C OUT
V OUT
C T
10nF
3300pF
7
SENSE –
SENSE +
8
R2
LTC1148 ? F09
1k
1000pF
R SENSE
+
OUTPUT DIVIDER REQUIRED WITH
ADJUSTABLE VERSION ONLY
Figure 9. LTC1148 Layout Diagram (See Board Layout Checklist)
114835fd
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1148HV | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1148HVCN | 功能描述:IC REG CTRLR BUCK PWM CM 14-DIP 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 |
| LTC1148HVCN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 14-DIP RoHS:是 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 |
| LTC1148HVCN-3.3 | 功能描述:IC REG CTRLR BUCK PWM CM 14-DIP 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 |
| LTC1148HVCN-3.3#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 14-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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