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参数资料
| 型号： | LTC1159CG-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20-SSOP |
| 标准包装： | 66 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 100% |
| 电源电压： | 4 V ~ 40 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： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
LTC1159
LTC1159-3.3/LTC1159-5
APPLICATIO S I FOR ATIO
)
)
V OFFSET = V OUT
certain types of inductors in high current (I OUT > 5A)
applications when they are lightly loaded.
An external offset is put in series with the SENSE – pin to
subtract from the built-in 0.025V offset. An example of this
technique is shown in Figure 7. Two 100 ? resistors are
inserted in series with the leads from the sense resistor.
With the addition of R3, a current is generated through R1
causing an offset of:
R1
R1 + R3
If V OFFSET > 0.025V, the minimum threshold will be
cancelled and Burst Mode operation is prevented from
occurring. Since V OFFSET is constant, the maximum load
current is also decreased by the same offset. Thus, to get
back to the same I MAX , the value of the sense resistor must
be reduced:
R SENSE ≈ 75 m ?
I MAX
To prevent noise spikes from erroneously tripping the
current comparator, a 1000pF capacitor is needed across
the SENSE – and SENSE + pins.
L
1
R SENSE
2
Board Layout Checklist
LTC1159
SENSE +
SENSE –
9
8
1000pF
R2
100 ?
R1
100 ?
3
LTC1159 ? F07
4
+
C OUT
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1159. These items are also illustrated graphically in
the layout diagram of Figure 8. Check the following in your
R3
Figure 7. Suppressing Burst Mode Operation
layout:
BOLD LINES INDICATE HIGH CURRENT PATHS
+
1N4148
0.15 μ F
P-CHANNEL
D1
C IN
V IN
1 μ F
N-CHANNEL
–
1
P-GATE
CAP
16
2
V IN
SHDN2
15
SHUTDOWN
0.1 μ F
3
V CC
EXTV CC
14
L
4
5
6
P-DRIVE
V CC
C T
N-GATE
PGND
SGND
13
12
11
5V EXTV CC
CONNECTION
OUTPUT DIVIDER
REQUIRED WITH
ADJUSTABLE
VERSION ONLY
–
C T
3300pF
1k
7
8
I TH
SENSE –
V FB
(SHDN1)
SENSE +
10
9
100pF
R1
R2
C OUT
3
1 V OUT
R SENSE
2
1000pF
4
+
LTC1159 ? F08
Figure 8. LTC1159 Layout Diagram (N and S Packages)
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1159CN | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1159CN-3.3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1159CN-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1159CS | 功能描述:IC REG CTRLR BUCK 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: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 |
| LTC1159CS#PBF | 功能描述:IC REG CTRLR BUCK 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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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