LT1616ES6#TRPBF Integrated Circuits (ICs)

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1. Describe

The LT®1616 is a current mode PWM step-down DC/DC converter with an internal 0.6A power switch in a tiny 6-pin SOT-23 package. The wide 3.6V to 25V input range makes the LT1616ES6#TRPBF suitable for regulating a wide variety of power supplies, from 4 cells and 5V logic rails to unregulated wall transformers and lead acid batteries. Its high operating frequency allows the use of tiny, low-cost inductors and ceramic capacitors. Since its internal compensation eliminates additional components, a complete 400mA buck regulator fits into a 0.15 square inch PC board area. The constant frequency current mode PWM architecture and stable operation of ceramic capacitors result in low, predictable output ripple. Current limit prevents output shorting. Low current (<1µA) shutdown provides complete output disconnection for easy power management in battery powered systems.

2. Feature

    1. Wide input range: 3.6V to 25V

    2. 5V @ 400mA from 7V to 25V input

    3. 3.3V at 400mA at 4.7V to 25V input

    4. Fixed frequency 1.4MHz operation

    5. Use of tiny capacitors and inductors

    6. Internal compensation

    7. Low Shutdown Current: <1µA

    8. Low VCESAT switch: 220mV at 300mA

    9. Tiny 6-Pin SOT-23 Package

3. Application

    1. Wall transformer regulation

    2. Local logic power conversion:

        - 12V to 5V

        - 12V or 5V to 3.3V, 2.5V or 1.8V

    3. Distributed Supply Supervision

    4. Digital camera

    5. Battery powered equipment

4. Pin configuration

5. Application Information

The LT1616ES6#TRPBF efficiently converts power from the input voltage source to a lower output voltage using an inductor for energy storage. The LT1616ES6#TRPBF uses its internal power switch and an external clamp diode to generate a PWM square wave. Inductor L1 and output capacitor C2 filter this square wave to produce a DC output voltage. The error amplifier regulates the output by comparing it to an internal reference. The LT1616ES6#TRPBF uses current mode control; instead of directly modulating the pulse width, the error amplifier controls the peak current in the switch and inductor. Current-mode control has several advantages, including simplified loop compensation and cycle-by-cycle current limiting. This circuit converts a 12V input to 3.3V at 300mA. When the internal switch is turned on, the SW pin voltage is close to the 12V input. This applies a voltage across the inductor L1 and the current in the switch and inductor increases. When the switch turns off, the switch current drops to zero immediately, and the inductor current flows through the clamp diode D1, which clamps the switch node to 0.4V below ground. In this state, the voltage across the inductor has the opposite meaning, equal to the output voltage plus the clamp diode drop, so the inductor current begins to decrease. At light loads, the inductor current may reach zero on each pulse. This is discontinuous mode operation and is the normal behavior of switching regulators.