L6738ATR

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The STMicroelectronics L6738ATR is a switching controller designed for DC to DC power conversion applications requiring very low power dissipation, ultra-small size, light weight, and low voltage, allowing maximum flexibility. The device is rated for output voltages up to 3.3V and includes current-control PWM based modulation, low-ripple peak current control with slope compensation, and active current limit. It also provides a low-offset, low-power current control mode to enhance efficiency. The L6738ATR also offers adjustable over-voltage and under-voltage protection, as well as thermal protection.

The L6738ATR provides a fully-integrated solution and is suitable for a wide range of applications, such as notebook computers, portable DVD players, and other applications that rely on low-power consumption and high efficiency. The device features an 11-lead TSOP-14 package and the features are suitable for converters ranging from a low input voltage of 6V up to 20V using a 3V output. The device includes an internal 4 V reference, an active internal current-sense amplifier, and an internal LDO providing a regulated 5 V supply.

The device operates in the PFM mode with a fixed frequency, allowing power conversion at low power consumption and low input voltage. In this mode, the L6738ATR provides up to 95% efficiency and 100% duty cycle without any external control signals. Furthermore, the device provides a PWM boost mode for higher efficiency, which also features dynamic current limiting for maximum protection. The low consumption/high efficiency mode can be used for applications where very low current consumption is required.

The L6738ATR operates according to a hysteretic current-mode control architecture. This architecture eliminates the need for external sense resistors and yields higher efficiency and better stability in line with wide input voltage and load range variations. Additionally, the device includes a variable frequency modulation scheme, allowing the optimization of the efficiency/noise trade-off. The device also includes independent soft-start/stop and phase-shifting capabilities as well as a wide range of protections.

The L6738ATR is a highly integrated, yet low-cost solution for implementing DC to DC conversion with the highest efficiency and the lowest possible power consumption. With its small size and weight, it is ideal for implementing power management systems with limited space requirements. Additionally, its integrated features and wide range of protections provide robust system designs with optimal reliability.

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