ML1565 Datasheet, PDF (1/21 Pages) Minilogic Device Corporation Limited – Step-Up-Down DC-DC Converts

ML1565
Step-Up-Down DC-DC Converts
Digital Still camera Power Supply
High-Efficiency, 5-channel
ML1565
General Description
The ML1565 provides a complete power-supply solution
for digital still and video cameras through the integration
of ultra-high-efficiency step-up/step-down DC-to-DC con-
verters along with three auxiliary step-up controllers. The
ML1565 is targeted for applications that use either 2 or 3
alkaline or NiMH batteries as well as those using a single
lithium-ion (Li+) battery.
The step-up DC-to-DC converter accepts inputs from 0.7V
to 5.5V and regulates a resistor-adjustable output from
2.7V to 5.5V. It uses internal MOSFETs to achieve
95% efficiency. Adjustable operating frequency facilitates
design for optimum size, cost, and efficiency.
The step-down DC-to-DC converter can produce output
voltages as low as 1.25V and also utilizes internal
MOSFETs to achieve 95% efficiency. An internal softstart
ramp minimizes surge current form the battery. The
converter can operate from the step-up output providing
buck-boost capability with up to 90% compound efficiency,
or it can run directly from the battery if buck-boost
operation is not needed. The ML1565 features auxiliary
step-up controllers that power CCD, LCD, motor actuator,
and backlight circuits. The ML1565 is available in a
space-saving QFN-32 thin package.
■ Pin Configuration
Features
Step-up DC-to-DC Converter:
95% Efficient
3.3V (Fixed) or 2.7V to 5.5V (Adjustable) Output
Voltage
Step-Down DC-to-DC Converter:
Operate form Battery for 95% Efficient Buck
Combine with Step-Up for 90% Efficient Buck-Boost
Adjustable Output Down to 1.25V
Three Auxiliary PWM Controllers
Up to 1MHz Operating Frequency
1µA Shutdown Mode
Internal Soft-Start control
Overload Protection
Compact 32-Pin, 5mmx5mm Thin QFN Package
Ordering Information
Item
ML1565QFNG
Package Mark
Shipping
QFN-32 ML1565 160pcs/ Tray
Applications
Digital Still Cameras
Digital video Cameras
PDAs
■ Typical operating Circuit
ML1565
ML1565
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P1/21
Rev. C, Sep 2005