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Power/Alternative Energy  

LDOs offer ultra-low standby power

Posted: 09 Aug 2012     Print Version  Bookmark and Share

Keywords:low drop-out regulator  LDO  PMIC 

ZMD AG (ZMDI) launches the ZSPM4121 and ZSPM4141 ultra-low-power, low drop-out (LDO) regulators and under-voltage battery protection switches with standby power consumption of 70nA and 20nA, respectively.

The ZSPM4121 is designed to protect batteries from destructive discharge by connecting or disconnecting the battery from the load based on a set threshold voltage. Even in off-mode, charger current can be delivered to the battery through an internal Schottky diode. In off-mode, the ZSPM4121 draws only 100pA standby current (Iqq-off), and in on-mode, standby current is at 70nA.

The device features an open-drain pull-down power-good-not (NPG ) pin that allows for an LED for power-good indication. Its factory-programmable threshold voltage ranges from 1.2V to 4.2V, in 100mV steps. It also offers over-current protection of 3A that eliminates external components, minimising the application footprint and engineering effort. The ZSPM4121 is suited for a wide range of applications including voltage monitoring in conventional or solar trickle-charging applications.

On the other hand, the ZSPM4141 is an ultra-low power LDO that can drive up to 200mA while consuming only 20nA in standby and 100pA in power-down mode. Its power consumption is up to 100 times lower than conventional LDOs. It offers Vin range of 2.5V to 5.5V and voltage output of 1.2V to 4.2V, factory-programmable in 100mV steps. It is suited for battery-operated applications because it is said to extend battery life to its maximum.

Both devices operate from -20°C to 85°C and come in 2mm x 2mm 8-L DFN package. The ZSPM4121 is priced at Rs.40.98 ($0.75), and the ZSPM4141, Rs.19.13 ($0.35), both at 1K units.





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