Product category:
Power Supply ICs and Controllers
News Release from: Intersil | Subject: ISL9000/11/12 family
Edited by the Electronicstalk Editorial
Team on 21 October 2005
LDOs promise the quiet life
A new family of LDOs claims a significant performance advantage in demanding noise-sensitive applications such as cellphone camera modules and digital still camera image sensors.
Intersil reckons its ISL9000/11/12 family of LDOs (low-dropout regulators) offers a significant performance advantage in demanding noise-sensitive applications such as cellphone camera modules and digital still camera image sensors The highest PSRR (power supply rejection ratio) is necessary to improve image quality, which is increasingly critical with the move towards megapixel resolutions in these applications
This article was originally published on Electronicstalk on 8 Oct 2008 at 8.00am (UK)
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By using leading-edge technology, the family of devices offers a significant advantage over competitors' in overall solution size and provide the industry's best combination of ultrahigh PSRR, very low noise, and low quiescent supply current to boost overall performance.
The ISL9000 offers 90dB PSRR at 1kHz, and the quiescent current is typically only 21uA per LDO when active.
The output voltage accuracy over temperature is 1.8% with a dropout of typically 200mV at 300mA.
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Separate enable pins control each individual LDO output.
When both enable pins are low, the device is in shutdown, typically drawing less than 0.1uA.
The ISL9000 integrates output voltage sequencing and individual power-on-reset (POR) functions for each output to remove the requirement for separate voltage monitoring/reset circuits.
The POR delay for VO2 (voltage output) can be externally programmed by connecting a timing capacitor to the CPOR pin.
The POR delay for VO1 is internally fixed at approximately 2ms to ensure voltage stability after startup.
A reference bypass pin is provided for connecting a noise filtering capacitor to increase the noise and PSRR performance.
Intersil's ISL9011 and ISL9012 are high-performance dual LDOs capable of sourcing 150mA current from channel 1 and 300mA from channel 2.
These devices have low standby current and are stable with output capacitance values of 1 to 10uF with ESR of up to 200mohm.
A reference bypass pin allows an external capacitor for adjusting a noise filter for low-noise and high-PSRR applications.
The ISL9011 and ISL9012 offer a PSRR of 70dB at 1kHz and the quiescent current is typically only 45uA with both LDOs enabled and active.
Separate enable pins control each individual LDO output.
When both enable pins are low, these devices are in shutdown mode, typically drawing less than 0.1uA.
Several combinations of voltage outputs are standard on the ISL9000/11/12.
Output voltage options for each LDO range from 1.2 to 3.6V.
The ISL9011/12 also offer pin compatibility with improved performance of some of the most popular dual LDOs on the market today.
Key features of the devices include: a wide input voltage capability of 2.3-6.5V; low output noise (typically 30uV RMS at 100uA (1.5V)); a +/-1.8% output voltage accuracy over all operating conditions; low dropout voltages - typically 200mV at 300mA (ISL9000) and 120mV at 150mA (ISL9011 and ISL9012); an excellent transient response to large current steps; excellent load regulation; and less than 0.1% voltage change across full range of load currents.
Target applications for the devices include PDAs, cellular phones and smart phones, digital still and video cameras, portable instruments, MP3 players, and other handheld devices - including medical handhelds.
Intersil's ISL9000, ISL9011 and ISL9012 are available now in 10-pin, lead-free DFN packages.
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