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参数资料
| 型号： | LTC1174CS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK INV ADJ 1A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 18 V |
| 输入电压： | 4 V ~ 18.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LTC1174
LTC1174-3.3/LTC1174-5
APPLICATIO S I FOR ATIO
V OUT
LTC1174-5 regulator and also to one or more loads in
6.8nF**
R2
parallel with the the regulator’s V IN . If the battery is dis-
LTC1174
V FB
1
100pF*
R1
connected while the LTC1174/LTC1174-3.3/LTC1174-5
regulator is supplying a light load and one of the parallel
circuits is a heavy load, the input capacitor of the LTC1174/
LTC1174-3.3/LTC1174-5 regulator could be pulled down
* ADJUSTABLE APPLICATIONS
** LOW NOISE APPLICATIONS
1174 F04
faster than the output capacitor, causing the absolute
Figure 4. LTC1174 Adjustable Configuration
INPUT VOLTAGE
4V TO 12V
maximum ratings to be exceeded. The result is often a
latchup which can be destructive if V IN is reapplied. Bat-
tery disconnect is possible as a result of mechanical stress,
bad battery contacts or use of a lithium-ion battery with
a built-in internal disconnect. The user needs to assess
3
LB IN
6
V IN
SHUTDOWN
8
0.1 μ F
+
47 μ F*
16V
× 2
his/her application to determine whether this situation
could occur. If so, additional protection is necessary.
2
LB OUT
V OUT
1
Prevention against latchup can be accomplished by sim-
7
I PGM SW
LTC1174HV-5
GND
4
* AVX TPSD476K016
** COILTRONICS CTX50-4
5
50 μ H**
MBRS140T3
+
47 μ F*
16V
× 2
V OUT
–5V
45mA
1174 F05
ply connecting a Schottky diode across the SW and V IN
pins as shown in Figure 6. The diode will normally be
reverse biased unless V IN is pulled below V OUT at which
time the diode will clamp the (V OUT – V IN ) potential to less
than the 0.6V required for latchup. Note that a low leakage
Schottky should be used to minimize the effect on no-load
Figure 5. Positive-to-Negative 5V Converter
output voltage is now taken off the GND pin. Therefore,
the maximum input voltage is now determined by the
difference between the absolute maximum voltage rating
and the output voltage. A maximum of 12V is specified in
Figure 5, giving the circuit a 1.5V of headroom for V IN . Note
that the circuit can operate from a minimum of 4V, making
it ideal for a 4 NiCad cell application. For a higher output
current circuit, please refer to the Typical Applications
section.
Absolute Maximum Ratings and Latchup Prevention
supply current. Schottky diodes such as MBR0530, BAS85
and BAT84 work well. Another more serious effect of the
protection diode leakage is that at no load with nothing to
provide a sink for this leakage current, the output voltage
can potentially float above the maximum allowable toler-
ance. To prevent this from occuring, a resistor must be
connected between V OUT and ground with a value low
enough to sink the maximum possible leakage current.
LATCHUP
PROTECTION
SCHOTTKY
The absolute maximum ratings specify that SW (Pin 5) can
never exceed V IN (Pin 6) by more than 0.3V. Normally this
situation should never occur. It could, however, if the
V IN SW
LTC1174
LTC1174-3.3
LTC1174-5
+
V OUT
1174 F06
output is held up while the supply is pulled down. A con-
dition where this could potentially occur is when a battery
is supplying power to an LTC1174/LTC1174-3.3/
Figure 6. Preventing Absolute Maximum
Ratings from Being Exceeded
1174fe
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1174HVCN8 | 功能描述:IC REG BUCK INV ADJ 1A 8DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1174HVCN8#PBF | 功能描述:IC REG BUCK INV ADJ 1A 8DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1174HVCN8-3.3 | 功能描述:IC REG BUCK INV 3.3V 1A 8DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1174HVCN8-3.3#PBF | 功能描述:IC REG BUCK INV 3.3V 1A 8DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1174HVCN8-5 | 功能描述:IC REG BUCK INV 5V 1A 8DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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