Datasheet > AS3649

AS3649

更新时间： 2022-02-26 13:33:21

品牌	Logo	应用领域
艾迈斯 - AMSCO		/
页数	文件大小	规格书
39页	3486K
描述
2500mA High Current LED Flash Driver

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AS3649 数据手册

AS3649

2500mA High Current LED Flash Driver

1 General Description

2 Key Features

High efficiency 4MHz fixed frequency DCDC Boost converter

The AS3649 is an inductive high efficient DCDC step up converter

with two current sources. The DCDC step up converter operates at a

fixed frequency of 4MHz and includes soft startup to allow easy

integration into noise sensitive RF systems. The two current sources

can operate in flash / torch or video light modes.

with soft start allows small coils

- Stable even in coil current limit

LED current adjustable up to 2x1000mA(2x1250mA with current

boost) or 2000mA and automatic load balancing for two LEDs

The AS3649 includes flash timeout, overvoltage, overtemperature,

undervoltage and LED short/open circuit protection functions. A

TXMASK/TORCH function reduces the flash current in case of

parallel operation to the RF power amplifier and avoids a system

shutdown. Alternatively this pin can be used to directly operate the

torch light directly. If the TXMask function is not used, it can be used

as a hardware torch input (programmable).

Automatic current adjustment for low battery voltage

PWM operation for lower output current for reliable light output

of the LED; can run at 31.5kHz to avoid audible noise

Protection functions:

Automatic Flash Timeout timer to protect the LED(s)

Overvoltage and undervoltage Protection

Overtemperature Protection

A hardware NTC pin can be used to measure the LED temperature

with the ADC and to automatically reduce the LED current if a

temperature threshold is exceeded.

LED short/open circuit protection

ADC to measure LED temperature

The AS3649 is controlled by an I²C interface and has a hardware

reset pin ON. Setting ON=0 resets the AS3649. Interface input

voltage levels are 1.8V compliant.

NTC to automatically reduce the flash current if the LED

temperature is too high (programmable level)

I²C Interface with hardware reset pin

The AS3649 is available in a space-saving WL-CSP package

measuring only 2.06x2.02x0.6mm and operates over the -30ºC to

+85ºC temperature range.

Available in tiny WL-CSP Package, 16 balls 0.5mm pitch,

2.06x2.02x0.6mm package size

3 Applications

Flash/Torch for mobile phones

Figure 1. Typical Operating Circuit

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AS3649

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