ZXLD1601

ZXLD1601 ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH IN SC70 DESCRIPTION The ZXLD1601 is a PFM inductive boost converter designed to provide output voltages of up to 28V from a 2.5V to 5.5V input supply. The ZXLD1601 includes the output switch and peak current sense resistor, and can provide up to 10mA output current at maximum output voltage. Higher current is available at lower output voltages. Quiescent current is typically 60␮A and a shutdown function is provided to reduce this current to less than 100nA in the ‘off’ state. Output voltage is set to a nominal value between 26V and 28V, by an internal resistor network, but can be adjusted to lower values by external resistors, an external PWM control signal applied to the ‘Enable’ pin, or a combination of the two. Depending upon the control frequency, the PWM signal will provide either continuous (low ripple) or gated control. The PWM filter components are contained within the chip. Minimum output voltage is determined by the input supply. The device is assembled in a low profile SC70-6 pin package. ADVANCED FEATURES Internal 30V NDMOS switch, current sense and output setting resistors. APPLICATIONS LCD and OLED bias Cellular / mobile phones Digital cameras PDAs LCD modules Varactor and PIN diode bias Palmtop computers True analogue output voltage control via PWM with internal filter FEATURES Low profile SC70-6 pin package Internal PWM filter for adjustable output High efficiency (85%...