LP2989AIM-1.8

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The LP2989AIM-1.8 is a micro power, low-dropout (LDO) 3-terminal, adjustable regulator that works with a wide range of input and output voltages. With its wide power-supply range of 3.0 V to 28 V and the ability to adjust its output voltage precisely, the LP2989AIM-1.8 is suitable for many power-supply applications. It features low dropout voltage, low quiescent current, high current-support capabilities and fast transient response.

Introduction

The LP2989AIM-1.8 is a micro power, low drop-out, 3-pin, adjustable regulator from Texas Instruments (TI). It is designed to work with a wide range of input and output voltages. Featuring a wide power-supply range from 3.0 to 28 V, the LP2989AIM-1.8 offers precise output voltage adjustment and can support high current-support capabilities with fast transient response. The IC’s low-dropout voltage, low quiescent current, and high current ratings makes it suitable for many power-supply applications.

Features

• Wide input voltage: 3.0V to 28V
• Low dropout voltage: 150mV
• Output voltage range: from 1.2V to 3.2V
• High current capability: 2A
• High accuracy: ±1%
• Very low quiescent current: 500μA
• Low thermal resistance: 7.3C/W
• Fast transient response
• Small size: 8-pin VSON package

Structure and Working Principle

The LP2989AIM-1.8 is a monolithic 8-pin Vertical Small Outline No-lead (VSON) IC, as shown in Figure 1.

Figure 1:LP2989AIM-1.8 Pin Out

In Figure 1, the pins from 1 to 5 are input stages, pins 6 and 7 are output stages, and pin 8 is a ground.

The input stage is an error amplifier with an internal 1.25V reference voltage (VREF) as shown in Figure 2. This reference voltage is connected to the inverting input of the error amplifier and the output voltage (Vout) is connected to the non-inverting input of the error amplifier.

Figure 2: LP2989AIM-1.8 Block Diagram

The LP2989AIM-1.8 also has a PFM/PWM (Pulse Frequency Modulation/Pulse Width Modulation) control system. When the output voltage Vout is below the reference voltage VREF, the internal comparator will be in the HIGH Vout and LOW Vout condition. If the voltage is lower, the internal comparator will be in the Low Vout condition, and the Low-side MOSFET will be "ON", and the output voltage will decrease. If the voltage is higher, the internal comparator will be in the High Vout condition, and the Low-side MOSFET will "OFF", and the output voltage will increase.

This PFM/PWM control system operates with a high switching frequency of 1MHz and a low-side MOSFET gate controlled by the PWM/PFM, so the LP2989AIM-1.8 can achieve fast transient response. The LP2989AIM-1.8 has current and temperature protection: During normal operation, the current limit protects the IC and if the temperature is too high, the thermal shutdown protection is activated.

Applications

The LP2989AIM-1.8 is suitable for many power-supply applications, such as: battery-powered devices, power supervisory and power loop systems, medical equipment and consumer products. It can also be used in systems such as: Network Interface Cards, Small and Medium-sized servers, Motherboards, Set-top boxes, Wireless and Wired modems, and Automotive applications.

Conclusion

The LP2989AIM-1.8 is a highly integrated, low drop-out, adjustable regulator from Texas Instruments. It has a wide range of input and output voltages, as well as a range of current-support capabilities and fast transient responses. The device is suitable for many power-supply applications, such as in battery-powered devices and consumer products. Thanks to its low dropout voltage, low quiescent current, and fast transient response times, the LP2989AIM-1.8 makes a great choice for many applications.

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