SHOUDING SD6303E30C

SD6303 is a BOOST topology, step-up PFM control mode DC-DC converter. The chip integrates an output voltage feedback and correction network, startup circuit, oscillator circuit, reference voltage circuit, PFM control circuit, overcurrent protection circuit, and power transistor. SD6303 requires very few external components — only one inductor, one Schottky diode, and input/output capacitors to provide a stable, low-noise output voltage of 2.5V to 5.0V. The PFM control circuit is the core of SD6303; this block controls the switching of the power transistor based on the input voltage signal, load signal, and current signal from other blocks, thereby achieving constant voltage output. In the PFM control system, the oscillation frequency and pulse width are fixed; stable output voltage is achieved by pulse-skipping to regulate the on-time of the power transistor per unit time according to the input-to-output voltage ratio and load conditions. The oscillator circuit provides the reference oscillation frequency and fixed pulse width. The reference voltage circuit provides a stable reference level. Due to the internal correction technique, output voltage accuracy is guaranteed to ±2.5%. Additionally, owing to careful temperature compensation design of the reference voltage, the output voltage temperature coefficient is less than 100ppm/°C. The high-gain error amplifier ensures stable output voltage under varying input voltages and load currents.

• High efficiency, low ripple, high operating frequency
• Only four external components required; boosts low battery input voltage to required operating voltage; suitable for portable 1~4 cell standard battery applications
• High-performance, low-power reference voltage circuit architecture with trimming technology; high output voltage accuracy and low temperature drift; output voltage accuracy better than ±2.5%; maximum efficiency up to 89%
• Available in four package options: SOT23, SOT23-5, SOT89-3, and TO-92; SOT23-5 package features built-in EN enable pin; when EN pin is driven low, the chip enters shutdown power-saving state with minimum power consumption
• Maximum operating frequency: 300KHz
• Output voltage: 2.5V~5.0V (0.1V step)
• Low startup voltage: 0.8V (1mA)
• Output accuracy: better than ±2.5%
• Maximum efficiency: 89%
• Output current: greater than 300mA (Vi = 2.5V, Vo = 3.3V)
• Low ripple, low noise
• Only four external components required

• Electronic devices powered by 1~3 dry-cell batteries
• LED flashlights, LED lights, blood pressure monitors
• Handheld electronic devices such as electronic dictionaries, car alarms, chargers, VCRs, and PDAs