LT1767EMS8E-2.5#PBF

LT1767EMS8E-2.5#PBF is a 1.25MHz monolithic buck-switching regulator. A high-efficiency 1.5A, 0.22-ohm switch is included on the die together with all the control circuitry required to complete a high-frequency, current-mode switching regulator. Current-mode control provides fast transient response and excellent loop stability. New design techniques achieve high efficiency at high switching frequencies over a wide operating range. A low dropout internal regulator maintains consistent performance over a wide range of inputs from 24V systems to Li-Ion batteries. An operating supply current of 1mA improves efficiency, especially at lower output currents. Shutdown reduces quiescent current to 6µA. Maximum switch current remains constant at all duty cycles. Synchronization allows an external logic-level signal to increase the internal oscillator from 1.5MHz to 2MHz. Applications include DSL modems, portable computers, wall adapters, battery-powered systems, and distributed power.

• Wide operating voltage range from 3V to 25V, current mode loop control
• Constant maximum switch current rating at all duty cycles
• Maximum switch current limit is 2A typical at (TA = 0°C to 125°C)
• Oscillator frequency is 1.25MHz typical at (3.3V < VIN < 25V, TA = 25°C)
• VIN supply current is 1mA typical at (VFB = VNOM + 17%)
• Shutdown supply current is 6µA typical at (active-low VSHDN = 0V, VIN = 25V, VSW = 0V)
• Maximum switch duty cycle is 90% typical at (VC = 1.2V, ISW = 400mA, TA = 25°C)
• FB input resistance is 21Kohm typical
• Operating junction temperature range from -40°C to 125°C
• 8-lead plastic MSOP package (exposed pad)

Notes

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