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| 型号： | AS1341 EB |
| 厂商： | ams |
| 文件页数： | 8/18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 Detailed Description
The AS1341 step-down converter was specifically designed for battery-powered portable devices, including laptop computers, PDAs, and MP3/
DVD/CD players. The advanced current-limited control scheme provides high-efficiency over a wide range of output loads. The highly-efficient
operation (up to 100% duty cycle) allows extremely low dropout voltage, increasing the usable supply voltage range. In no-load conditions the
AS1341 draws only 12μA; in shutdown mode it draws only 0.8μA to further reduce power consumption and extend battery life.
The AS1341 features an integrated 20V switching MOSFET, internal current sensing, and a high switching frequency, for minimal PCB space
and external component requirements.
Figure 21. AS1341 - Block Diagram - 5V fixed Output Voltage
3
5
+
–
+
–
–
+
POK
4
R PULL
L1
IN
C IN
LX
8
AS1341
OUT
C OUT
+
1
7
SHDNN
6
Current Limit
Q
R
S
+
–
FB
D1
ILIMIT
Control
Maximum On-
Time Delay
Minimum Off-Time
Delay
–
+
V SET
1.25V
+
–
100mV
+
–
2
GND
8.1 Current-Limit Control
The AS1341 uses a proprietary current-limiting control scheme with operation up to 100% duty cycle. The DC-DC converter pulses as needed to
maintain regulation, resulting in a variable switching frequency that increases with the load. This eliminates the high-supply currents associated
with conventional constant-frequency pulse-width-modulation (PWM) controllers that unnecessarily switch the MOSFET.
When the output voltage is too low, the error comparator sets a flip-flop, which turns on the internal P-channel MOSFET and begins a switching
cycle. The inductor current ramps up linearly, storing energy in a magnetic field while charging the output capacitor and servicing the load (see
Figure 19 on page 7) .
The MOSFET turns off when the peak current limit is reached, or when the maximum on-time of 10μs is exceeded and the output voltage is in
regulation. If the output is out of regulation and the peak current is never reached, the MOSFET remains on, allowing a duty cycle up to 100%.
This feature ensures the lowest possible dropout voltage.
Once the MOSFET turns off, the flip-flop resets, the inductor current is pulled through D1 (see Figure 21) , and the current through the inductor
ramps back down, transferring the stored energy to the output capacitor and load. The MOSFET remains off until the 0.4μs minimum off-time
expires, and the output voltage goes out of regulation.
www.ams.com/DC-DC_Step-Up/AS1341
Revision 1.09
8 - 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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