Datasheet > AS1325-BSTT-50

AS1325-BSTT-50

更新时间： 2024-01-03 11:41:06

品牌	Logo	应用领域
艾迈斯 - AMSCO		转换器
页数	文件大小	规格书
16页	973K
描述
300mA Step-Up DC-DC Converter

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AS1325-BSTT-50 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
Base Number Matches：	1

AS1325-BSTT-50 数据手册

AS1325

austriamicrosystems

Data Sheet

Shutdown

When pin SHDNN is low the AS1325 is switched off and no current is drawn from battery; when pin SHDNN is high the

device is switched on. If SHDNN is driven from a logic-level output, the logic high-level (on) should be referenced to

VOUT to avoid intermittently switching the device on.

Note: If pin SHDNN is not used, it should be connected directly to pin OUT.

In shutdown the battery input is connected to the output through the inductor and the internal synchronous rectifier P-

FET. This allows the input battery to provide backup power for devices such as an idle microcontroller, memory, or real-

time-clock, without the usual diode forward drop. In this way a separate backup battery is not needed.

In cases where there is residual voltage during shutdown, some small amount of energy will be transferred from pin

OUT to pin BATT immediately after shutdown, resulting in a momentary spike of the voltage at pin BATT. The ratio of

CIN and COUT partly determine the size and duration of this spike, as does the current-sink ability of the input device.

Low-Battery Cutoff

The AS1325 SHDNN trip threshold (1.228V) can be used as an input voltage detector that disables the device when

the battery input voltage falls to a pre-set level. An external resistor-divider network can be used to set the battery-

detection voltage (see Figure 27).

Figure 27. Low-Battery Cutoff Application Diagram

+5.0V Output only

+1.5 to +3.3V or

+1.5 to +5.0V

Battery

+3.3V or +5.0V

Output

BATT

OUT

COUT

22µF

CIN

22µF

100kΩ

Power-On

Reset

AS1325

RESETN

10µH

220kΩ

SHDNN

GND

10nF

1MΩ

For the resistor-divider network shown in Figure 27, calculate the value for R1 by:

R1 = R2 x ((VOFF/VSHDNN) - 1)

(EQ 1)

Where:

VOFF is the battery voltage at which the AS1325 shuts down.

VSHDNN = 1.228V

The value of R2 should be between 100kΩ and 1MΩ to minimize battery drain.

Note: Input ripple can cause false shutdowns, therefore to minimize the effect of ripple, a low-value capacitor from

SHDNN to GND should be used to filter out input noise. The value of the capacitor should be such that the R/C

time constant is > 2ms.

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