DESCRIPTION

· The MIC9131 is a high-voltage, high-speed telecom DC-to-DC controller designed for efficient conversion of -48V telecom voltages to logic levels.
· It features a high voltage start-up circuit, allowing connection to input voltages up to 180V, protecting against telecom line transients.
· The device supports high-speed operation with sub-25ns pulse width control and an internal oscillator capable of over 2.5MHz.
· It achieves over 90% efficiency at high output currents and has a low quiescent current of 1.3mA.
· Available in 16-pin SOP and QSOP packages, operating from -40°C to +125°C.

FEATURES

· Input voltages up to 180V.
· Internal oscillator capable of > 2.5MHz operation.
· Accurate 75% maximum duty cycle.
· Synchronisation capability to 6MHz.
· Current sense delay of 34ns.
· Minimum pulse width of <25ns.
· 90% efficiency.
· 1.3mA quiescent current.
· 1µA shutdown current.
· Soft-start.
· Resistor programmable current sense threshold.
· Selectable soft-start retry.
· 4Ω sink, 12Ω source output driver.
· Programmable under-voltage lockout.
· Constant-frequency PWM current-mode control.
· 16-pin SOIC and 16-pin QSOP.

APPLICATIONS

· Telecom power supplies.
· Line cards.
· ISDN network terminators.
· Micro- and pico-cell base stations.
· Low power (< 100W) dc-dc converters.
· DSL line cards.