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参数资料
| 型号： | AS1341 EB |
| 厂商： | ams |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AS1341 |
| 设计资源： | Design Support Tool |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 600mA |
| 输入电压： | 4.5 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 200kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AS1341 |
AS1341
Datasheet - D e t a i l e d D e s c r i p t i o n
8.2 Dropout Voltage
A buck converter ’s minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply voltage. In battery-
powered systems, this limits the useful end-of-life battery voltage. To maximize battery life, the AS1341 operates with duty cycles up to 100%,
which minimizes the dropout voltage and eliminates switching losses while in dropout. When the supply voltage approaches the output voltage,
the P-channel MOSFET remains on continuously to supply the load.
Note: Dropout voltage is defined as the difference between the input and output voltages when the input is low enough for the output to drop
out of regulation.
For a step-down converter with 100% duty cycle, dropout is related to the MOSFET drain-to-source on-resistance (R DSON ) and inductor series
resistance (R INDUCTOR ), and thus it is proportional to the load current:
V DROPOUT = I OUT x (R DSON + R INDUCTOR )
(EQ 1)
8.3 Shutdown
A logic low on pin SHDNN shuts down the AS1341; a logic high on SHDNN powers on the device.
In shutdown mode the supply current drops to 0.8μA to maximize battery life, and the internal P-channel MOSFET turns off to isolate the output
from the input. The output capacitance and load current determine the output voltage decay rate.
Note: Pin SHDNN should not be left floating. If the shutdown feature is not used, connect SHDNN to IN.
8.4 Power-OK Output
The AS1341 provides a Power OK output (POK) that goes high-impedance when the output reaches 92.5% of its regulation point. POK goes low
when the output is below 92.5% of the regulation point and the AS1341 is turned on (IN ≥ 4.5V and SHDNN ≥ 2.4V). A 12k ? to 1M ? pullup
resistor between pin POK and pin IN or pin OUT or another voltage ( ≤ IN) can provide a microprocessor logic control signal.
Note: Connect pin POK to GND when the Power-Ok feature is not used.
8.5 Thermal-Overload Protection
Integrated thermal-overload protection limits total power dissipation in the AS1341. During continuous thermal-overload conditions, when the
AS1341 junction temperature exceeds T J = +145oC, the internal thermal sensor turns off the pass transistor, allowing the AS1341 to cool down.
When the AS1341 junction temperature cools by 10oC, the thermal sensor turns the pass transistor on again resulting in a pulsed output.
www.ams.com/DC-DC_Step-Up/AS1341
Revision 1.09
9 - 18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1341-TD_EK_ST | 功能描述:AS1341 - DC/DC, Step Down with LDO 1, Non-Isolated Outputs Evaluation Board 制造商:ams 系列:- 零件状态:有效 主要用途:DC/DC，LDO 步降 输出和类型:1，非隔离 功率 - 输出:- 电压 - 输出:3.3V 电流 - 输出:600mA 电压 - 输入:4.5 V ~ 20 V 稳压器拓扑:降压 频率 - 开关:200kHz 板类型:完全填充 所含物品:板 使用的 IC/零件:AS1341 标准包装:1 |
| AS1343 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:42V, 1-2 Cells, Micropower, DC-DC Boost Converter |
| AS1343 EB | 功能描述:BOARD EVAL AS1343 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| AS1343ABTDT10 | 制造商:ams 功能描述:IC BOOST DC/DC CONVERTER TDFN-10 |
| AS1343A-BTDT-10 | 功能描述:IC REG BOOST ADJ 1.4A 10TDFN 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:50 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:5 V ~ 25 V 输入电压:2.3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:600kHz，1.2MHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 包装:管件 供应商设备封装:8-MSOP |
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