CJ9117C33T5

The CJ9117 Series is a CMOS PFM-control step-up switching DC/DC converter. The PFM controller allows the duty ratio to be automatically switched according to the load (light load: 66%, high output current: 78%), enabling products with a low ripple over a wide range, high efficiency, and high output current. With the CJ9117 Series, a step-up switching DC/DC converter can be configured by using an external coil, capacitor, and diode. The built-in MOSFET is turned off by a protection circuit when the voltage at the LX pin exceeds the limit to prevent it from being damaged. This feature, along with the mini package and low current consumption, makes the CJ9117 Series ideal for applications such as the power supply unit of portable equipment.

Applications

• Digital cameras
• Electronic notebooks and PDAs
• Portable CD/MD players
• Cameras, video equipment
• Communications equipment
• Power supply for microcomputers

Key features

• Low voltage operation: Startup at 0.9 V min. (I_OUT = 1 mA) guaranteed
• Duty ratio: 66/78%, built in auto switching type PFM controller
• External parts: Coil, capacitor, diode
• Output voltage: Settable to between 1.8V to 6.0 V in 0.1 V steps
• Accuracy of ±2%
• High efficiency: ±85% (typ.)
• Standard function (product type A)
• Shutdown function (product type C,D)
• External transistor type available (product type B、D)