General Description
The AP2014 controller IC is designed to provide a low cost synchronous Buck regulator for on-board DC to DC converter applications. With the migration of today’s ASIC products requiring low supply voltages such as 1.8V and lower, together with currents in excess of 3A, traditional linear regulators are simply too lossy to be used when input supply is 5V or even in some cases with 3.3V input supply. The AP2014 together with dual N-channel MOSFETs such as AF9410, provide a low cost solution for such applications. This device features an internal 200KHz oscillator (400KHz for "A" version), under-voltage lockout for both Vcc and Vc supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected.

Features
*Synchronous Controller in 8-Pin Package
*Operating with single 5V or 12V supply voltage
*Internal 200KHz Oscillator (400KHz for AP2014A)
*Soft-Start Function
*Fixed Frequency Voltage Mode
*500mA Peak Output Drive Capability
*Protects the output when control FET is shorted
*SOP-8L/PDIP-8L Pb-Free package

Applications
*Graphic Card
*Hard Disk Drive
*DDR memory source sink Vtt application
*Low cost on-board DC to DC such as 5V to 3.3V, 2.5V or 1.8V

AP2014A, AP2014S, AP2014-AS, AP2014N, AP2014-AN

Trackback :: http://datasheetblog.com/trackback/2892

댓글을 달아 주세요 Comment

General Description
ASM8P18xx is a high performance, adjustable frequency, PWM controller with an integrated spread spectrum modulator for EMI reduction. It contains all the functions of a standard PWM controller along with a user configurable spread spectrum modulation with adjustable spread. ASM8P18xx allows significant system cost savings by reducing the number of PCB layers and shielding that are traditionally required to pass EMI regulation.
ASM8P18xx is the industry’s first general purpose EMI reduction IC, specifically designed for use in SMPS systems. ASM8P18xx is compatible to any other 3842 PWM controllers.
ASM8P18xx is capable of driving 1A maximum current output and it covers a wide supply voltage range from 7V DC to 30V DC. The PWM frequency is selectable from 40 KHz to 400 KHz.
ASM8P18xx provides under voltage lockout, thermal shutdown, overload, and undercurrent protection. It is available in 8-pin MicroSO, P-DIP and SOIC package.

Features
*30V maximum operating voltage with CMOS technology
*Adjustable PWM frequencies (40 KHz to 400 KHz)
*Maximum Output drive current of 1A.
*Wide duty cycle range (0% minimum to 95% maximum)
*Spread spectrum modulation with adjustable spread.
*Under voltage lockout with hysteresis.
*Low startup current: 275?A maximum
*Pin compatible with industry standard 3842 PWM controller.
*Temperature range –40°C to +85°C.
*Thermal shutdown, overload and undercurrent protection.
*Frequency skip mode.
*Available in 8-pin plastic MicroSO, P-DIP and SOIC packages.

Applications
*Off-line converter
*DC-DC converter
*Monitor power supply
*Computer/DVD/STB power supply
*Wireless base station power supply
*Telecom power supply

ASM8P18S42ER, ASM8P1843, ASM8P18S43ER, ASM8P18S44ER, ASM8P18S45ER

Trackback :: http://datasheetblog.com/trackback/2889

댓글을 달아 주세요 Comment

General Description
The RT9247 is a multi-phase buck DC/DC controller integrated with all control functions for GHz CPU VRM. The RT9247 controls 2 or 3 buck switching stages operating in interleaved phase set automatically. The multi-phase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equivalent operating frequency also reduces the component dimension and the output voltage ripple in load transient.
RT9247 controls both voltage and current loops to achieve good regulation, response & power stage thermal balance. Precise current loop using RDS(ON) as sense component builds precise load line for strict VRM DC & transient specification and also ensures thermal balance of different power stages. The settings of current sense, droop tuning, VCORE initial offset and over current protection are independent to compensation circuit of voltage loop. The feature greatly facilitates the flexibility of CPU power supply design and tuning.
The DAC output of RT9247 supports VRD10 by 6-bit VID input, precise initial value & smooth VCORE transient at VID jump. The IC monitors the VCORE voltage for PGOOD and over-voltage protection. Soft-start, over-current protection and programmable under-voltage lockout are also provided to assure the safety of microprocessor and power system.

Features
*Multi-Phase Power Conversion with Automatic Phase Selection
*VRD10 DAC Output with Active Droop Compensation for Fast Load Transient
*Smooth VCORE Transition at VID Jump
*Power Stage Thermal Balance by RDS(ON) Current Sense
*Hiccup Mode Over-Current Protection
*Programmable Switching Frequency (50kHz to 400kHz per Phase), Under-Voltage Lockout and Soft-Start
*High Ripple Frequency Times Channel Number
*RoHS Compliant and 100% Lead (Pb)-Free

Applications
*Intel® Processors Voltage Regulator: VRD10
*Low Output Voltage, High Current DC-DC Converters
*Voltage Regulator Modules

RT9247PC, RT9247GC

Trackback :: http://datasheetblog.com/trackback/2869

댓글을 달아 주세요 Comment