Low-current LDOs

3 August 2011 Power Electronics / Power Management

New from ON Semiconductor are five low dropout (LDO) linear voltage regulators capable of delivering output current of 150 mA.

With an output voltage range of 1,2 V to 3,3 V, the NCP4682 and NCP4685 have a supply current of just 1 μA typical. They incorporate output current protection and a fully integrated soft-start circuit to minimise inrush current and ensure there is no output voltage overshoot. Output voltage accuracy is ±0,8%. Available packages include a UDFN-4 package measuring 1 x 1 x 0,6 mm.

With ±1,0% output voltage accuracy, the NCP4681 and NCP4684 also have a 1 μA typical supply current and are specified over a wider output voltage range of 0,8 V to 3,6 V. They benefit from the same soft-start and output current protection features as the NCP4682 and NCP4685. Available packages include an XDFN-4 measuring just 0,8 x 0,8 x 0,4 mm.

The NCP4682 and NCP4681 both include an enable function to reduce supply current by employing a standby mode. In contrast, the NCP4684 and NCP4685 eliminate this function in order to avoid any associated pull-down current, thereby lowering the quiescent current for battery-powered portable applications which are required to spend most of their time in an active mode.

The NCP4680, which completes the new lineup, can operate with an input voltage of 1,4 V minimum. The device delivers strong transient response with ripple rejection of 75 dB and output voltage accuracy of ±1%. Its output voltage range covers 0,8 V to 3,5 V and the available packages include the XDFN-4.

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