High-Performance PWM Controller CXMD3257 is a single‐phase, constant‐on‐time, synchronous PWM controller, which drives N‐channel MOSFETs. The CXMD3257 steps down high voltage to generate low‐voltage

   产品概述 返回TOPsBf嘉泰姆

The CXMD3257 is a single‐phase, constant‐on‐time, synchronous PWM controller, which drives N‐channel MOSFETs. The CXMD3257 steps down high voltage to generate low‐voltage chipset or RAM supplies in notebook computers. The CXMD3257 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the CXMD3257 provides very high efficiency over light to heavy loads with loading‐ modulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency for low‐noise requirements. The CXMD3257 is equipped with accurate positive current‐ limit, output under‐voltage, and output over‐voltage protections, perfect for NB applications. The Power‐On‐  Reset function monitors the voltage on VCC to prevent wrong operation during power‐on. The CXMD3257 has a 1ms digital soft‐start and built‐in an integrated output discharge method for soft‐stop. An internal integrated soft‐start ramps up the output voltage with programmable slew rate to reduce the start‐up current. A soft‐stop function actively discharges the output capacitors with controlled reverse inductor current. The CXMD3257 is available in 10pin TDFN 3x3 package.

   产品特点 返回TOPsBf嘉泰姆

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l  Adjustable Output Voltage from +0.7V to +5.5VsBf嘉泰姆

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l  0.7V Reference VoltagesBf嘉泰姆

l  ±1% Accuracy Over-TemperaturesBf嘉泰姆

l  Operates from an Input Battery Voltage Range of +1.8V to +32VsBf嘉泰姆

l  Power-On-Reset Monitoring on VCC PinsBf嘉泰姆

l  Excellent Line and Load Transient ResponsessBf嘉泰姆

l  PFM Mode for Increased Light Load EfficiencysBf嘉泰姆

l  Selectable PWM Frequency from 4 Preset ValuessBf嘉泰姆

l  Integrated MOSFET DriverssBf嘉泰姆

l  Integrated Bootstrap Forward P-CH MOSFETsBf嘉泰姆

l  Adjustable Integrated Soft-Start and Soft-StopsBf嘉泰姆

l  Selectable Forced PWM or Automatic PFM/PWM ModesBf嘉泰姆

l  Power Good MonitoringsBf嘉泰姆

l  70% Under-Voltage ProtectionsBf嘉泰姆

l  125% Over-Voltage ProtectionsBf嘉泰姆

l  Adjustable Current-Limit ProtectionsBf嘉泰姆

l  Using Sense Low-Side MOSFET’s RDS(ON)sBf嘉泰姆

l  Over-Temperature ProtectionsBf嘉泰姆

l  TDFN-10 3x3 PackagesBf嘉泰姆

l  Lead Free and Green Devices Available (RoHS Compliant)sBf嘉泰姆

   应用范围 返回TOPsBf嘉泰姆

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l  NotebooksBf嘉泰姆

l  Table PCsBf嘉泰姆

l  Hand-Held PortablesBf嘉泰姆

l  AIO PCsBf嘉泰姆

l  LCD Monitor / TVsBf嘉泰姆

l  Battery ChargersBf嘉泰姆

l  ADSL ModemsBf嘉泰姆

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