LT3471EDD#PBF

The dual-channel switching regulator combines two 42V, 1.3A switches with an error amplifier capable of sensing down to ground potential, providing boost and negative output conversion. Low V\u1d04\u1d07\u209b\u2090\u209t bipolar switches enable high-current output in a minimal PCB footprint. The 1.2MHz switching frequency allows the use of compact, low-cost, low-profile inductors and capacitors. Programmable soft-start eliminates high inrush current during startup, with an external RC network setting the current ramp rate. The constant-frequency current-mode PWM architecture produces predictable, low output noise that is easy to filter. The switches are rated at 42V, making this device ideal for boost converters up to ±40V, as well as SEPIC and flyback designs. In a SEPIC design, each channel can generate a 5V/630mA output from a 3.3V supply, or a 5V/510mA output from four alkaline cells. The device can be configured as two boost converters, one boost converter and one negative output converter, or two negative output converters. Available in a low-profile (0.75mm height) 10-lead, 3mm × 3mm DFN package.

Applications

• Organic LED power supplies
• Digital cameras
• White LED power supplies
• Cellular phones
• Medical diagnostic equipment
• Local ±5V or ±12V power supplies
• TFT-LCD bias power supplies
• xDSL power supplies

Key features

• 1.2MHz switching frequency
• Low V_CESAT switch: 330mV/1.3A
• High output voltage: up to 40V
• Wide input range: 2.4V to 16V
• Negative output conversion capability
• 5V/630mA output from 3.3V input
• 12V/320mA output from 5V input
• -12V/200mA output from 5V input
• Compact SMT components
• Low shutdown current: <1μA
• Low-profile (0.75mm height) 10-pin 3mm×3mm DFN package