GENERAL DESCRIPTION
RZ3111A consists of step-down switching regulator with PWM control. These devise include a
reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc.
RZ3111A provides low-ripple power, high efficiency, and excellent transient characteristics. The
PWM control circuit is able to the duty ratio linearly form 0 up to 100%. This converter is build out soft
start function that prevents overshoot and inrush current at startup. An over current protect function and
short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency
will be reduced. The operating frequency is decided by outside resistance. An external compensation is
easily to system stable.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected
externally, these ICs can function as step-down switching regulators. They serve as ideal power supply
units for portable devices when coupled with the SOP8-EP with exposed pad package, providing such
outstanding features as low current consumption. Since this converter can accommodate an input
voltage up to 40V, it is also suitable for the operation via an AC adapter.
FEATURES
- Input voltage：4.2V to 40V
- Output voltage：0.8V to 38V
- Duty ratio：0% to 100% PWM control
- Oscillation frequency range is 50K — 500KHz by outside resistance setting
- Current Limit, Short Circuit Protect (SCP) and Thermal Shutdown protection
- Built-in internal SW P-channel MOS.
- SOP8-EP Pb-Free package.