EP1551 Datasheet, PDF (1/16 Pages) Eorex Corporation – 1 MHz Five-channel Power Supply

Preliminary
EP1551
1 MHz Five-channel Power Supply
FEATURES
‧ Up to 95% efficiency Step-up and up to 92%
efficient Step-down converters
‧ Combine Step-up and Step-down for up to 87%
efficiency buck-boost operations
‧ Minimum 0.7V input voltage
‧ 2µA shutdown mode
‧ Internal soft start control
‧ Overload protection
‧ Compact QFN-32 5 x 5 mm package
APPLICATIONS
‧ Digital still camera
‧ Digital video camera
‧ PDA
‧ MP3
‧ PMP
‧ Portable DVD Player
‧ Car navigation
DESCRIPTION
The EP1551 is a small, high efficiency, five-channel, power-supply for digital still and video cameras. It consists
of:
‧ 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.
‧ 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.
‧ PWM controller with external FET for Step-up DC-DC converter for 5V motor actuator
‧ PWM controller with external FET for 15V LCD supply
‧ 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 is available
in apace saving QFN-32 5 x 5 mm packages. An evaluation kit is also available to expedite design.
Rev.01
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