LM3677LEE-1.8/NOPB

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The LM3677LEE-1.8/NOPB is a step-down switch-mode voltage regulator with an integrated power MOSFET. It is a DC-to-DC converter optimized to minimize external component count while providing ultra low-noise and excellent load transient response, allowing performance enhancement of a typical data communications system. The LM3677LEE-1.8/NOPB can accept an input voltage range of up to 2.35V, making it suitable for use in most applications where a low-voltage, low-current supply is required, such as output voltage range of 1.8V and 1.9V.

The LM3677LEE-1.8/NOPB is a PMIC (Power Management IC) classified in Voltage Regulators type DC DC Switching Regulators. It is an ideal Voltage converter in applications with power sources that range from 1.8V to 5.5V. This makes the LM3677LEE-1.8/NOPB especially suitable for use with microprocessors in portable equipment. The LM3677LEE-1.8/NOPB has two integrated enable/shutdown inputs for increased system design flexibility.

The LM3677LEE-1.8/NOPB is designed to minimize the system design effort and cost with built-in features such as thermal overload and frequency jitter, as well as minimize external component count. Its maximum output current is 260mA, so it can handle most applications even with reduced power waste. Its quiescent current is only 1.5mA, so the power dissipation is significantly reduced. The small package size (9-pin small Outline Package or SOP) yields a compact design suitable for space-constrained products. The LM3677LEE-1.8/NOPB features internal current limiting, thermal shutdown and frequency-jittering in order to minimize RF emissions.

The LM3677LEE-1.8/NOPB employs current-mode control theory. This method provides improved load and line regulation, along with low-noise operation and short transient recovery time due to the fast loop response. The applied current mode control technique has the advantage of excellent current regulator which results in better line-regulation and fast transient response. The internal oscillator of the LM3677LEE-1.8/NOPB can be set to build a frequency from 200 kHz to 1.5 MHz. The level of the output voltage is adjustable by means of a single power divider resistor.

The operation of the LM3677LEE-1.8/NOPB is based on the input voltage applied to the power input VIN and the control signal applied to the gate of the power MOSFET, controlled by the internal oscillator. When the power MOSFET is turned-on, the current is limited and regulated by the integrated current regulator. The output voltage is determined by the values of the internal resistor divider and the voltage drop across the power MOSFET. The internal current source is activated only when the voltage across the output exceeds the ‘Vc’ (current limiting threshold).

The LM3677LEE-1.8/NOPB enables designers to minimize external power and control circuit components. It is designed to minimize external power loss and supply voltage ripple for communication and computer processor applications, as well as enable high-performance system power management solutions. Its adaptive on-time feature, combined with its high efficiency and low quiescent current, make it an ideal choice for systems that require minimal power consumption. This allows the design of compact, cost-effective, and low-noise electronic systems.

The LM3677LEE-1.8/NOPB features integrated undervoltage lockout (UVLO) making it suitable for wide input voltage range applications. It includes an internal power MOSFET (rated up to 25V and 5.5A) to reduce switch noise and losses. The internal soft-start circuitry eliminates high inrush current and shutdown sequencing. The LM3677LEE-1.8/NOPB also features adjustable over-current protection (OCP) and over-temperature protection (OTP) providing reliable system protection for a wide range of applications.

This chip is well suited for a variety of low-voltagω applications such as telecommunications, computer processor and personal electronics. The LM3677LEE-1.8/NOPB the ultimate solutions for customers who need high efficiency, low noise, and excellent transient response in a low profile, cost-effective voltage converter.

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