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| 型号： | AS1334-BTDT |
| 厂商： | ams |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.65A 8TDFN |
| 设计资源： | Design Support Tool |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 3.4 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 650mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-TDFN（3x3） |
AS1334
Datasheet - D e t a i l e d D e s c r i p t i o n
8.2 Internal Synchronous Rectifier
To reduce the rectifier forward voltage drop and the associated power loss, the AS1334 uses an internal NFET as a synchronous rectifier. The
big advantage of a synchronous rectification is the higher efficiency in a condition where the output voltage is low compared to the voltage drop
across an ordinary rectifier diode. During the inductor current down slope in the second part of each cycle the synchronous rectifier is turned on.
Before the next cycle the synchronous rectifier is turned off.
There is no need for an external diode because the NFET is conducting through its intrinsic body diode during the transient intervals before it
turns on.
8.3 Power-OK
The POK output indicates if the output voltage is within 90% of the nominal voltage level. As long as the output voltage is within regulation the
open-drain POK output sinks current.
8.4 Shutdown Mode
If EN is set to high (>1.2V) the AS1334 is in normal operation mode. During power-up and when the power supply is less than 2.7V minimum
operating voltage, the chip should be turned off by setting EN low. In shutdown mode the following blocks of the AS1334 are turned off, PFET
switch, NFET synchronous rectifier, reference voltage source, control and bias circuitry. The AS1334 is designed for compact portable
applications, such as mobile phones where the system controller controls operation mode for maximizing battery life and requirements for small
package size outweigh the additional size required for inclusion of UVLO (Under Voltage Lock-Out) circuitry.
Note: Setting the EN digital pin low (<0.5V) places the AS1334 in a 0.01μA (typ) shutdown mode.
8.5 Thermal Overload Protection
To prevent the AS1334 from short-term misuse and overload conditions the chip includes a thermal overload protection. To block the normal
operation mode the device is turning the PFET and the NFET off in PWM mode as soon as the junction temperature exceeds 150°C. To resume
normal operation the temperature has to drop below 140°C.
Note: Continuing operation in thermal overload conditions may damage the device and is considered bad practice.
8.6 Current Limiting For Protection
If in the PWM mode the cycle-by-cycle current limit of 1200mA (max.) is reached the current limit feature takes place and protects the device and
the external components. A timed current limiting mode is working when a load pulls the output voltage down to approximately 0.375V. In this
timed current limit mode the inductor current is forced to ramp down to a safe value. This is achieved by turning off the internal PFET switch and
delaying the start of the next cycle for 3.5us. The synchronous rectifier is also turned off in the timed current limit mode.
The advantage of the timed current limit mode is to prevent the device from the loss of the current control.
Revision 1.09
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1334-BTDT-12 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:650mA, Ultra low Ripple Step Down DC/DC Converter |
| AS1334-BTDT-15 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:650mA, Ultra low Ripple Step Down DC/DC Converter |
| AS1334-BTDT-18 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:650mA, Ultra low Ripple Step Down DC/DC Converter |
| AS1334-BTDT-25 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:650mA, Ultra low Ripple Step Down DC/DC Converter |
| AS1334-BTDT-30 | 功能描述:IC REG BUCK SYNC 3V 0.65A 8TDFN 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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