■ DESCRIPTION

The MB3817 is a pulse width modulator (PWM) type switching regulator controller IC designed for low-voltage and high-speed operation. This can be used in applications as down-conversion or down/up-conversion (Zeta method) .

With fewer external components and faster operating speed, the MB3817 enables reduction in power supply unit size, making it ideal for use with internal power supplies in compact, high-performance portable devices.

■ FEATURES

• Wide range of operating power supply voltages : 2.5 V to 18 V

• Built-in high-precision reference voltage generator : 1.5 V ± 2

• High speed operation is possible : Max 500 kHz

• Wide input voltage range of error amplifier : 0 V to VCC − 0.9 V

• Built-in soft start function

• Built-in timer/latch-actuated short-circuiting protection circuit

• Totem-pole type output with adjustable on/off current (for PNP transistors)

• Built-in standby function

• Small package : SSOP-16P (FPT-16P-M05)