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参数资料
| 型号： | LTC1159CG#TR |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20-SSOP |
| 标准包装： | 1,800 |
| 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： | 带卷 (TR) |
LTC1159
LTC1159-3.3/LTC1159-5
APPLICATIO S I FOR ATIO
) )
V OUT = 1 + R2 1.25V
4. EXTV CC ConnectedtoanExternalSupply.Ifanexternal
supply is available in the 5V to 12V range, it may be used
to power EXTV CC providing it is compatible with the
MOSFET gate drive requirements. There are no restrictions
on the EXTV CC voltage relative to V IN . EXTV CC may be
higher than V IN providing EXTV CC does not exceed the 15V
absolute maximum rating.
When driving standard threshold MOSFETs, the exter-
nal supply must always be present during operation to
prevent MOSFET failure due to insufficient gate drive. The
LTC1149 family should also be considered for applications
which require the use of standard threshold MOSFETs.
Important Information About LTC1159 Adjustable
Applications
When an output voltage other than 3.3V or 5V is required,
the LTC1159 adjustable version is used with an external
resistive divider from V OUT to the V FB pin (Figure 6). The
regulated voltage is determined by:
R1
The V FB pin is extremely sensitive to pickup from the
inductor switching node. Care should be taken to isolate
the feedback network from the inductor, and the 100pF
capacitor should be connected between the V FB and SGND
In LTC1159N and LTC1159S applications with V OUT >
5.5V, the V CC pin may self-power through the SENSE pins
when SHDN2 is taken high, preventing shutdown. In these
applications, a pull-down must be added to the SENSE – pin
as shown in Figure 6. This pull-down effectively takes the
place of the SHDN1 pin, ensuring complete shutdown.
Note: For versions in which both the SHDN1 and SHDN2
pins are available (LTC1159G and all fixed output ver-
sions), the two pins are simply connected to each other and
driven together to guarantee complete shutdown.
The Figure 6 circuit cannot be used to regulate a V OUT which
is greater than the maximum voltage allowed on the
LTC1159 SENSE pins (13V). In applications with V OUT >
13V, R SENSE must be moved to the ground side of the
output capacitor and load. This operates the current sense
comparator at 0V common mode, increasing the off-time
approximately 40% and requiring the use of a smaller
timing capacitor C T .
Inverting Regular Applications
The LTC1159 can also be used to obtain negative output
voltages from positive inputs. In these inverting applica-
tions, the current sense resistor connects to ground while
the LTC1159 and N-channel MOSFET connections, which
would normally go to ground, instead ride on the negative
output. This allows the negative output voltage to be set by
pins next to the package.
V IN
V IN
1N4148
+
100 μ F
50V
+
1 μ F
0.15 μ F
CAP
V CC
V CC
P-GATE
LTC1159
P-DRIVE
N-GATE
0.1 μ F
5M
Si4401DY
Si4840DY
100 μ H
1N5819
3
1
R SENSE
0.039 ?
2
4
V OUT
3300pF
I TH
C T
PGND
EXTV CC
R2
215k
+
150 μ F
16V
1k
C T
390pF
V FB
100pF
R1
24.9k
OS-CON
( )
V OUT = 1 + R2 1.25
0V = NORMAL
>3V = SHUTDOWN
SHDN2
SGND
SENSE +
SENSE –
0.01 μ F
VN2222LL
100 ?
100 ?
R1
LTC1159 ? F06
VALUES SHOWN FOR V OUT = 12V/2.5A
Figure 6. High Efficiency Adjustable Regulator with 5.5V < V OUT < 13V
12
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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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