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参数资料
| 型号： | LTC1142CG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 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： | -40°C ~ 85°C |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
LTC1142/LTC1142L/LTC1142HV
APPLICATIO S I FOR ATIO
To prevent stray pickup a 100pF capacitor is suggested
across R1 located close to the LTC1142HV-ADJ/LTC1142L-
ADJ as in Figure 6. The external divider network must be
placed across C OUT with the negative plate of C OUT returned
to signal ground. Refer to the Board Layout Checklist.
the layout diagram of Figure 7. In general each block
should be self-contained with little cross coupling for best
performance. Check the following in your layout:
1. Are the signal and power grounds segregated? The
LTC1142 signal ground [Pin 3 (17) for the LTC1142, Pin
V FB
[PIN 2(16)]
R2
+
R SENSE
V OUT
4 (18) for LTC1142-ADJ] 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,
SGND
[PIN 4(18)]
100pF
R1
C OUT
and (–) plate of C IN , which should have as short lead
lengths as possible.
1142 F06
Figure 6. LTC1142-ADJ External Feedback Network
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1142. These items are also illustrated graphically in
1000pF
+
2. Does the LTC1142 Sense – , Pin 28 (14) connect to a
point close to R SENSE and the (+) plate of C OUT ?
3. Are the Sense – and Sense + leads routed together with
minimum PC trace spacing? The 1000pF capacitor
between Pins 1 (15) and 28 (14) should be as close as
possible to the LTC1142. Ensure accurate current sens-
SENSE RESISTOR PCB PATTERN
R SENSE3
+
V OUT3
C OUT3
1
SENSE + 3
SENSE – 3
28
3300pF
1k
SENSE + SENSE –
–
L1
SHDN (3.3V OUTPUT)
2
SHDN3
3 SGND3
I TH3
INTV CC3
27
26
C T3
+
4
PGND3
C T3
25
N-CH
5 NC
6
NDRIVE 3
7 NC
24
V IN3
PDRIVE 3 23
NC 22
+
V IN3
1 μ F
P-CH
D2
C IN5
V IN5
–
D1
8 NC
LTC1142
NC 21
–
V IN3
C IN3
P-CH
V IN5
1 μ F
9 PDRIVE 5
10
V IN5
20
NDRIVE 5
NC 19
N-CH
+
C T5
3300pF
11
12
13
C T5
INTV CC5
I TH5
PGND5
SGND5
SHDN5
18
17
16
SHDN (5V OUTPUT)
L2
–
1k
14
SENSE – 5
SENSE + 5
15
C OUT5
V OUT5
R SENSE5
+
BOLD LINES INDICATE HIGH CURRENT PATHS
1000pF
1142 F07
Figure 7. LTC1142 Layout Diagram (see Board Layout Checklist)
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1142HV | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1142HV-ADJ | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1142HVCG | 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 |
| LTC1142HVCG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP 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 |
| LTC1142HVCG#TR | 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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