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

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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TOP6o5嘉泰姆

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l  Adjustable Output Voltage from +0.7V to +5.5V6o5嘉泰姆

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l  0.7V Reference Voltage6o5嘉泰姆

l  ±1% Accuracy Over-Temperature6o5嘉泰姆

l  Operates from an Input Battery Voltage Range of +1.8V to +32V6o5嘉泰姆

l  Power-On-Reset Monitoring on VCC Pin6o5嘉泰姆

l  Excellent Line and Load Transient Responses6o5嘉泰姆

l  PFM Mode for Increased Light Load Efficiency6o5嘉泰姆

l  Selectable PWM Frequency from 4 Preset Values6o5嘉泰姆

l  Integrated MOSFET Drivers6o5嘉泰姆

l  Integrated Bootstrap Forward P-CH MOSFET6o5嘉泰姆

l  Adjustable Integrated Soft-Start and Soft-Stop6o5嘉泰姆

l  Selectable Forced PWM or Automatic PFM/PWM Mode6o5嘉泰姆

l  Power Good Monitoring6o5嘉泰姆

l  70% Under-Voltage Protection6o5嘉泰姆

l  125% Over-Voltage Protection6o5嘉泰姆

l  Adjustable Current-Limit Protection6o5嘉泰姆

l  Using Sense Low-Side MOSFET’s RDS(ON)6o5嘉泰姆

l  Over-Temperature Protection6o5嘉泰姆

l  TDFN-10 3x3 Package6o5嘉泰姆

l  Lead Free and Green Devices Available (RoHS Compliant)6o5嘉泰姆

   应用范围 返回TOP6o5嘉泰姆

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l  Notebook6o5嘉泰姆

l  Table PC6o5嘉泰姆

l  Hand-Held Portable6o5嘉泰姆

l  AIO PC6o5嘉泰姆

l  LCD Monitor / TV6o5嘉泰姆

l  Battery Charger6o5嘉泰姆

l  ADSL Modem6o5嘉泰姆

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