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AS1170

Detailed description

Datasheet

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Detailed description

The AS1170 is a high performance DCDC step up converter with internal PMOS and NMOS

switches. Its output is connected to one or two flash LEDs1 with an internal current sink. The

device is controlled by the pins SDA and SCL in I²C mode.

The actual operating mode like standby, assist light, indicator or flash mode, can then be

chosen by the interface. If not in standby mode, the device automatically enters shutdown

mode by keeping SCL low for more than t2.

The AS1170 includes a fixed frequency DCDC step-up with accurate startup control. Together

with the current sink (on LED_OUT1/2) it includes several protection and safety functions.

Figure 16: Internal circuit diagram

1 If two LEDs are connected, it is possible to operate each of the two LEDs individually as the LED current can be selected

individually.

2 Following registers are reset to their default value if the timeout expires: out_on=0, mode_setting=00, const_v_mode=0.

AS1170 数据表(PDF) 16 Page - ams-OSRAM AG