Step-Down Synchronous DC-DCs Compatible with 18V Input and 3A Peak Output

Torex Semiconductor Ltd. has launched the XC9280 series of step-down synchronous dc-dc converters, which are compatible with 18V input and 3A peak output and have a 70% smaller package area than our previous products.

Products in the XC9280 series support 18V input and 3A peak output, and have a switching frequency of 1.2 MHz allowing them to be used with small coils (2.2μH inductance). They employ a compact TSOT-26 package (2.8 x 2.9 x h1.1mm) with mounting feet, which has a 70% smaller package area per unit than our previous products, as well as a 25% smaller mounting area than our previous products due to their higher switching frequency.

These products have an operating voltage range of 4.5V – 18V, and can support output voltages ranging from 1.8V - 7.0V. With a quiescent current of 80μA, their control system uses PFM/PWM automatic switchover control.

Applications are expected to include digital TVs, set top boxs, security cameras, smart meters, security systems, and so on.

Even with their compact packages, they can maintain on-resistance values of 0.166Ω (High Side) and 0.13Ω (Low Side), a level equivalent to previous products. They are also equipped with a built-in external adjustment soft-start function effective in preventing output capacity inrush and output voltage startup delays.

XC9280 Series Features

• 70% smaller package size than previous products (TSOT-26 package: 2.8 x 2.9 x h1.1mm)
• 25% smaller mounting area than our previous products due to reduced package size
• Switching frequency of 1.2 MHz allows use with small coils (2.2μH inductance)
• 90% efficiency (IOUT=1000mA)
• Soft-start external adjustment is possible

Specifications include:

• Input voltage range of 4.5V to 18V（Absolute Max 20V）
• Output voltage range of 1.8V to 0V or VIN x 0.7
• FB Voltage of 0.75V±1.5%
• Oscillation frequency is 1.2MHz
• Output current 3A peak
  • 0Adc (VIN=12V, VOUT=5V)
• Control method is PWM/PFM automatic
• Soft-start time of 0.95ms
  • Adjustable by RC
• Protection Circuits include UVLO
  • Over Current Protection
  • （Automatic Recovery）
  • Thermal Shutdown
• Suitable for use with low ESR ceramic capacitors
• Package, TSOT-26
• Environmentally friendly, EU RoHS compliant, Pb free