LT1129IQ

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OverviewThe LT1129IQ is a voltage regulator intended for low voltage, low power applications. It is a CMOS version of the popular LM2502 regulator, featuring improved dynamic performance and ultra-low quiescent current. It is capable of supply current up to 350mA at an output voltage of 1.2 to 15V and is designed for operation between 1.8 and 15V input supply. The low heat dissipated by the device allows the device to be used in traditional IC packages, in extremely noisy environments, or within slim form factor designs.

FeaturesThe LT1129IQ features important features and advantages. It is designed to meet the most demanding requirements for low power, low output voltages, low noise and fast transient response. The device operates with extreme efficiency, as it is capable of supply current up to 350mA at an output voltage of 1.2 to 15V. It is internally protected from reverse voltage, over temperature, over current and short circuit faults. The LT1129IQ includes very low power dissipation, low quiescent current and low input bias current.

The LT1129IQ includes an on-chip current limit circuitry to protect the device and the load. The current limit can be externally programmed and is factory preset to a safe value. The device also includes an over temperature shutdown that disables the output drivers when the die temperature exceeds a pre-set threshold. The device also features a power-on reset signal which resets the shutdown circuit when power is applied. The output voltage can be trimmed with an external resistor divider.

Application fieldsThe LT1129IQ can be used to regulate the input voltage and current for a variety of applications. It can be used in portable devices such as cell phones and PDAs, as well as other low voltage, low power applications such as PDAs and portable logic level converters. The device can also be used in industrial control systems, process controls and analog control systems to regulate the output voltage and current.

The LT1129IQ is also suitable for battery-powered applications such as remote RF transmitters and smart cards. It can also be used in medical or military applications to ensure that the output voltage is accurately regulated and remains within the required voltage range. The LT1129IQ is also suitable for automotive applications due to its low power operation and wide operating temperature range.

Working principleThe LT1129IQ is a linear regulator device that uses a negative feedback loop to maintain the output voltage. The device has an internal reference voltage which is compared to the output voltage. If the output voltage deviates from the reference voltage, the error amplifier compares the reference voltage to the feedback voltage and adjusts the output voltage accordingly. The size of the change in output voltage is dependent on the gain and bandwidth of the error amplifier.

The device also has an internal current limit temp and current limit circuitry which protect the device and the load. The current limit and temperature limit both operate in the same fashion, when the current or temperature limit is reached, the voltage regulator shuts down. When the device is powered up again, the power-on reset signal resets the current limit and temperature limit circuits so that the voltage regulator can start up again.

ConclusionThe LT1129IQ is an excellent voltage regulator that features low power consumption, low input bias current and low output noise. The device is designed specifically for low voltage and low power applications. It has an adjustable current limit and an over temperature shutdown to protect the device and the load. The device is ideal for portable and automotive applications, process control, battery-powered applications, and industrial control systems.

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