- 您现在的位置：买卖IC网 > PDF目录15347 > LTC1622CS8#TR (Linear Technology)IC REG CTRLR BUCK PWM CM 8-SOIC PDF资料下载
参数资料
| 型号： | LTC1622CS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 625kHz |
| 占空比： | 100% |
| 电源电压： | 2 V ~ 10 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1622CS8TR Q1155309 |
LTC1622
APPLICATIO N S I N FOR M ATIO N
Transition Loss = 3(V IN ) 2 I O(MAX) C RSS (f)
Other losses including C IN and C OUT ESR dissipative
losses, and inductor core losses, generally account for
LTC1622
I TH V FB
R2
+
D FB
V OUT
less than 2% total additional loss.
Run/Soft-Start Function
The RUN/SS pin is a dual purpose pin that provides the
soft-start function and a means to shut down the LTC1622.
Soft-start reduces input surge current from V IN by gradu-
ally increasing the internal current limit. Power supply
sequencing can also be accomplished using this pin.
An internal 2.5 μ A current source charges up an external
capacitor C SS . When the voltage on the RUN/SS reaches
0.7V the LTC1622 begins operating. As the voltage on
RUN/SS continues to ramp from 0.7V to 1.8V, the internal
current limit is also ramped at a proportional linear rate.
The current limit begins near 0A (at V RUN/SS = 0.7V) and
ends at 0.1/R SENSE (V RUN/SS ≥ 1.8V). The output current
R1
1622 F05
Figure 5. Foldback Current Limiting
Design Example
Assume the LTC1622 is used in a single lithium-ion
battery-powered cellular phone application. The V IN will be
operating from a maximum of 4.2V down to a minimum of
2.7V. Load current requirement is a maximum of 1.5A but
most of the time it will be on standby mode, requiring only
2mA. Efficiency at both low and high load current is
important. Output voltage is 2.5V.
In the above application, Burst Mode operation is enabled
thus ramps up slowly, reducing the starting surge current
required from the input power supply. If the RUN/SS has
been pulled all the way to ground, there will be a delay
before the current limit starts increasing and is given by:
by connecting Pin 5 to V IN .
Maximum Duty Cycle =
V OUT + V D
V IN ( MIN ) + V D
= 93 %
t DELAY = 2.8 ? 10 5 ? C SS in seconds
Pulling the RUN/SS pin below 0.4V puts the LTC1622 into
a low quiescent current shutdown (I Q < 15 μ A).
From Figure 2, SF = 57%.
Use the curve of Figure 2 since the operating frequency is
the free running frequency of the LTC1622.
=
Foldback Current Limiting
As described in the Output Diode Selection, the worst-
case dissipation occurs with a short-circuited output
R SENSE =
SF 0 . 57
( 15 )( I OUT )( 100 ) ( 15 )( 1 . 5 A )
= 0 . 0253 ?
when the diode conducts the current limit value almost
continuously. To prevent excessive heating in the diode,
foldback current limiting can be added to reduce the
In the application, a 0.025 ? resistor is used. For the
inductor, the required value is:
? 0 . 025 ?
current in proportion to the severity of the fault.
Foldback current limiting is implemented by adding diode
D FB (1N4148 or equivalent) between the output and the I TH
pin as shown in Figure 5. In a hard short (V OUT = 0V), the
L MIN =
4 . 2 ? 2 . 5 ? 2 . 5 + 0 . 3 ?
? 0 . 036 ? ? ? 4 . 2 + 0 . 3 ? ?
550 kHz ? ?
= 1 . 33 μ H
current will be reduced to approximately 50% of the
maximum output current.
In the application, a 3.9 μ H inductor is used to reduce
inductor ripple current and thus, output voltage ripple.
For the selection of the external MOSFET, the R DS(ON)
must be guaranteed at 2.5V since the LTC1622 has to work
11
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1872ES6#TR | IC REG CTRLR BST PWM CM SOT23-6 |
| LTC1872ES6#TRPBF | IC REG CTRLR BST PWM CM SOT23-6 |
| LTC1872ES6#TRM | IC REG CTRLR BST PWM CM SOT23-6 |
| UVY1C332MHD | CAP ALUM 3300UF 16V 20% RADIAL |
| URU0J472MRD | CAP ALUM 4700UF 6.3V 20% RADIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1622IS8 | 功能描述:IC REG CTRLR BUCK PWM CM 8-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) |
| LTC1622IS8#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-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) |
| LTC1622IS8#TR | 功能描述:IC REG CTRLR BUCK PWM CM 8-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) |
| LTC1622IS8#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-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) |
| LTC1623CMS8 | 功能描述:IC HI-SIDE SW CNTRLR DUAL 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:5 系列:- 配置:低端 输入类型:非反相 延迟时间:600ns 电流 - 峰:12A 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:- 电源电压:14.2 V ~ 15.8 V 工作温度:-20°C ~ 60°C 安装类型:通孔 封装/外壳:21-SIP 模块 供应商设备封装:模块 包装:散装 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名称:835-1063 |
发布紧急采购，3分钟左右您将得到回复。