Text version of the page

Preliminary

EP1551

1 MHz Five-channel Power Supply FEATURES APPLICATIONS

Θ Up to 95% efficiency Step-up and up to 92% efficient Step-down converters Combine Θ Digital still camera Θ Digital video camera Θ Step-up and Step-down for up to 87% efficiency buck-boost operations Minimum 0.7V input voltage Θ PDA Θ MP3 Θ 2µA shutdown mode Θ PMP Θ Intern Θ Portable DVD Player Θ al soft start control Overload protection Θ Car navigation Θ Compact Θ QFN-32 5 x 5 mm package

DESCRIPTION

The EP1551 is a small, high efficiency, five-channel, power-supply for digital still and video cameras. It consists of: Θ Step-up DC-DC converter with on-chip power MOSFETs for 3.3V main system supply with up to 95% efficiency. It accepts inputs from 0.7V to 5.5V and regulates a resistor-adjustable output from 2.7V to 5.5V. Θ Step-down main DC-DC converter with on-chip power MOSFETs for 1.5V DSP core supply with up to 92% efficiency. It can operate from the Step-up main system supply providing buck-boost capability with up to 90% compound efficiency, or it can run directly from battery if buck-boost operation is not needed. Θ PWM controller with external FET for Step-up DC-DC converter for 5V motor actuator Θ PWM controller with external FET for 15V LCD supply Θ PWM controller with external FET and transformer for –7.5V and +15V CCD Bias All DC-DC channels operate at one fixed frequency settable from 100KHz to 1MHz to optimize size,cost and efficiency. Other features include soft-start, power-OK outputs, and overload protection. The EP1551 isavailable in apace saving QFN-32 5 x 5 mm packages. An evaluation kit is also available to expedite design.

Rev.01

1/16