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参数资料
| 型号： | LTC1266CS-3.3#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 16-SOIC |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 400kHz |
| 占空比： | 100% |
| 电源电压： | 3.5 V ~ 18 V |
| 降压： | 是 |
| 升压： | 是 |
| 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
LTC1266
LTC1266-3.3/LTC1266-5
APPLICATIO S I FOR ATIO
Troubleshooting Hints
Since efficiency is critical to LTC1266 series applications,
it is very important to verify that the circuit is functioning
correctly in both continuous and Burst Mode operation.
The waveform to monitor is the voltage on the timing
capacitor, Pin 6.
In continuous mode (I LOAD > I BURST ) the voltage on the C T
pin should be a sawtooth with a 0.9V P-P swing. This
voltage should never dip below 2V as shown in Figure 9a.
When load currents are low (I LOAD < I BURST ) Burst Mode
operation should occur with the C T pin waveform periodi-
cally falling to ground for periods of time as shown in
Figure 9b.
3.3V
If Pin 6 is observed falling to ground at high output
currents, it indicates poor decoupling or improper ground-
ing. Refer to the Board Layout Checklist.
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1266 series. These items are also illustrated graphi-
cally in the layout diagram of Figure 10. Check the follow-
ing in your layout:
1. Are the signal and power grounds segregated? The
LTC1266 signal ground (Pin 12) must return to the (–)
plate of C OUT . The power ground returns to the source
of the bottom-side MOSFET, anode of the Schottky
diode and (–) plate of C IN , which should have as short
lead lengths as possible.
(a) Continuous Mode Operation
(b) Burst Mode Operation
0V
3.3V
0V
1266 F09
2. Does the LTC1266 SENSE – (Pin 8) connect to a point
close to R SENSE and the (+) plate of C OUT ? In adjustable
applications, the resistive divider R1 and R2 must be
connected between the (+) plate of C OUT and signal
ground.
Figure 9. C T Waveforms
+
BOLD LINES INDICATE
HIGH CURRENT PATHS
C B
C IN
V IN
1
2
3
TDRIVE
PWR V IN
PINV
BDRIVE
PGND
LB OUT
16
15
14
L
–
4
BINH
LTC1266
LB IN
13
5
V IN
SGND
12
–
CT
6
7
3300pF 8
470 ?
C T
I TH
SENSE –
SHDN
V FB
SENSE +
11
10
9
SHUTDOWN
R1
R2
+
C OUT
R SENSE
V OUT
+
1000pF
OUTPUT DIVIDER REQUIRED WITH
ADJUSTABLE VERSION ONLY
1266 F10
Figure 10. LTC1266 Layout Diagram (See Layout Checklist)
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1266CS-5 | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1266CS-5#PBF | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1266CS-5#TR | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1266CS-5#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1266IS | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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