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参数资料
| 型号： | LTC3632IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 20MA 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 50 V |
| 输入电压： | 4.5 V ~ 50 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 20mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3632
APPLICATIONS INFORMATION
Output Voltage Programming
The output voltage is set by an external resistive divider
according to the following equation:
controller is enabled. Figure 7 shows examples of con-
figurations for driving the RUN pin from logic.
V SUPPLY V IN
V OUT = 0.8V ? ? 1 +
R2 ?
?
?
R1 ?
?
LTC3632
RUN
4.7M
LTC3632
RUN
The resistive divider allows the V FB pin to sense a fraction
of the output voltage as shown in Figure 6. Output voltage
adjustment range is from 0.8V to V IN .
Figure 7. RUN Pin Interface to Logic
3632 F07
R3
Δ I VIN = ? OUT ? ? ? OUT ?
Rising ? V IN ? UVLO ? Threshold = 1.21V ? ? 1 +
R2 ?
Falling ? V IN ? UVLO ? Threshold = 1.10V ? ? 1 +
R2 + R3 ?
V OUT
R1
V FB
LTC3632 R2
GND
3632 F06
Figure 6. Setting the Output Voltage
To minimize the no-load supply current, resistor values in
the megohm range should be used; however, large resistor
values should be used with caution. The feedback divider
is the only load current when in shutdown. If PCB leak-
age current to the output node or switch node exceeds
the load current, the output voltage will be pulled up. In
normal operation, this is generally a minor concern since
the load current is much greater than the leakage. The
increase in supply current due to the feedback resistors
can be calculated from:
? V ? ? V ?
? R1 + R2 ? ? V IN ?
Run Pin with Programmable Hysteresis
The LTC3632 has a low power shutdown mode controlled
by the RUN pin. Pulling the RUN pin below 0.7V puts the
LTC3632 into a low quiescent current shutdown mode
(I Q ~ 3μA). When the RUN pin is greater than 1.2V, the
The RUN pin can alternatively be configured as a precise
undervoltage lockout (UVLO) on the V IN supply with a
resistive divider from V IN to ground. The RUN pin com-
parator nominally provides 10% hysteresis when used in
this method; however, additional hysteresis may be added
with the use of the HYST pin. The HYST pin is an open-
drain output that is pulled to ground whenever the RUN
comparator is not tripped. A simple resistive divider can
be used as shown in Figure 8 to meet specific V IN voltage
requirements.
V IN
R1
RUN
R2 LTC3632
HYST
3632 F08
Figure 8. Adjustable Undervoltage Lockout
Specific values for these UVLO thresholds can be computed
from the following equations:
? R1 ?
?
?
? R1 ?
?
?
3632fc
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相关代理商/技术参数 |
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| LTC3632IMS8E#PBF | 功能描述:IC REG BUCK SYNC ADJ 20MA 8MSOP 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 |
| LTC3632IMS8E#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 20MA 8MSOP 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 |
| LTC3633AEFE#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 28-Pin TSSOP EP 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 3A DL 28TSSOP 制造商:Linear Technology 功能描述:BUCK DUAL 3.6-20V 4MHZ 3A 28TSSOP 制造商:Linear Technology 功能描述:BUCK, DUAL, 3.6-20V, 4MHZ, 3A, 28TSSOP 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Dual 3A, 20Vin, 4MHz, Monolithic Synchronous Step-Down Regu 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 4MHZ, TSSOP-28, Primary Input Voltage:15V, No. of Outputs:2, Output Current:3A, No. of Pins:28, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:28-TSSOP , RoHS Compliant: Yes |
| LTC3633AEFE#TRPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 28-Pin TSSOP EP T/R 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 3A DL 28TSSOP |
| LTC3633AEFE-1#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 28-Pin TSSOP EP 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 3A DL 28TSSOP 制造商:Linear Technology 功能描述:BUCK DUAL 3.6-20V 4MHZ 3A 28TSSOP 制造商:Linear Technology 功能描述:BUCK, DUAL, 3.6-20V, 4MHZ, 3A, 28TSSOP 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Dual 3A, 20Vin, 4MHz, Monolithic Synchronous Step-Down Regu 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 4MHZ, TSSOP-28, Primary Input Voltage:15V, No. of Outputs:2, Output Current:3A, No. of Pins:28, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:28-TSSOP , RoHS Compliant: Yes |
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