Datasheet > AS1334-BTDT-15

AS1334-BTDT-15

更新时间： 2024-02-06 16:53:52

品牌	Logo	应用领域
艾迈斯 - AMSCO		转换器
页数	文件大小	规格书
17页	1733K
描述
650mA, Ultra low Ripple Step Down DC/DC Converter

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AS1334-BTDT-15 技术参数

是否无铅：	不含铅	生命周期：	Active
Reach Compliance Code：	unknown	风险等级：	5.74
Is Samacsys：	N	Base Number Matches：	1

AS1334-BTDT-15 数据手册

AS1334

Datasheet - Detailed Description

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.

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.

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.

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 the 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.

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 achived 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.

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与AS1334-BTDT-15相关器件

型号	品牌	描述	获取价格	数据表
AS1334-BTDT-18	AMSCO	650mA, Ultra low Ripple Step Down DC/DC Converter	获取价格
AS1334-BTDT-25	AMSCO	650mA, Ultra low Ripple Step Down DC/DC Converter	获取价格
AS1334-BTDT-30	AMSCO	650mA, Ultra low Ripple Step Down DC/DC Converter	获取价格
AS1334-BTDT-33	AMSCO	650mA, Ultra low Ripple Step Down DC/DC Converter	获取价格
AS1334-BTDT-XX	AMSCO	650mA, Ultra low Ripple Step Down DC/DC Converter	获取价格
AS1335	AMSCO	1.5A, 1.5MHz, Synchronous DC/DC Step-Down Converter	获取价格

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