RZ3111A Datasheet | Wuxi Microelectronics

PWM Control 3A Step-Down Converter 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 pensation 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 acmodate 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. Block Diagram OCSET P OSC - + - Reference Voltage Source with Soft Start Vcc + Oscillation Circuit PWM-Switched Control Circuit Thermal VEN Shutdown SW 60u A VSS V1.0 2010-10 Tel. 0510-85898501 18061979821 Fax. 0510-85898500 1/7 PWM Control 3A Step-Down Converter PIN ASSIGNMENT The package of RZ3111A is SOP8-EP; the pin assignment is given...