■ DESCRIPTION
The LM1204 Series is a CMOS PFM-control step-up switching regulator that mainly consists of a reference voltage source, an oscillator, and a comparator. enabling products with a low ripple over a wide range, high efficiency, and high output current. Products with a fixed duty ratio of 75 %（Lower Output Voltage）or 88%(Higher Output Volrage) are also available. With the LM1204 Series, a step-up switching regulator can be configured by using an external coil, capacitor, and diode. A protection circuit turns off the built-in MOS FET when the voltage at the CONT pin exceeds the limit to prevent it from being damaged. This feature, along with the mini package and low current consumption, makes the LM1204 Series ideal for applications such as the power supply unit of portable equipment. The LM1204 Series, which features an external transistor, is suitable for applications requiring a high output current.
■ FEATURES
Low voltage operation: Startup at 0.9 V min. (IOUT=1 mA) guaranteed
Low input current: During maximum operation: 23 υA (VOUT=3.3 V, typ.)
Duty ratio: 75 % Built-in fixed-type PFM controller
External parts: Coil, capacitor, and diode
Output voltage: Settable to between 1.5 to 6.0V accuracy of ±2%
■ APPLICATIONS
Power supply for portable equipment such as digital cameras, electronic notebooks, and PDA
Power supply for audio equipment such as portable CD/MD players
Constant voltage power supply for cameras, video equipment, and communications equipment
Power supply for microcomputers
■ PACKAGE
S0T-23-3
SOT-89-3
