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UC3550 Datasheet Pwm/pfm Switchable Step-up DC-dc Controller

Manufacturer: Unisonic Technologies

Overview: UNISONIC TECHNOLOGIES CO., LTD UC3550 PWM CONTROLLED, PWM/PFM SWITCHABLE STEP-UP.

General Description

The UTC UC3550 series is a compact, high efficiency, step-up DC/DC controllers includes an error amplifier, oscillator, PWM comparator, skip cycle comparator, voltage reference, soft-start, and high speed lower ON-resistance driver for driving external power devices (NMOS or NPN) ,Additionally, a CE (chip enable) function that reduces power consumption during shut-down mode.

That typically operated from a single-or dual-cell battery packs.

It have a driver pin ,ext pin, for connecting to an external transistor(NMOS or NPN).

Key Features

  • S.
  • Input Voltage Range：0.9~8V.
  • Output Voltage Range：1.8~6V Programmable in 0.1V with High Accuracy ± 2.5%.
  • High Efficiency 88% (Typ. ).
  • Low Start-up Voltage of 0.9V Typical at IOUT = 1.0mA.
  • Oscillator Frequency: 300kHz. (±20%).
  • Chip Enable Pin with Pull-up Current Source.
  • High Output Current up to 1000mA (VIN = 2.0V, VOUT =3.3V).

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