ML1565QFNG

ML1565 ML1565 Step-Up-Down DC-DC Converts Digital Still camera Power Supply High-Efficiency, 5-channel 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 converters 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. 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 QFN-32 ML1565 Shipping 160pcs/ Tray Applications Digital Still Cameras Digital video Cameras PDAs ■ Pin Configuration ■ Typical operating Circuit ML1565 ML1565 -- P1/21 Rev. C, Sep 2005 ML1565 ■ Function Diagram Absolute Maximum Ratings (VOUTSU=3.3V, TA=0℃ Parameter OUTSU_, INSD, SDOK, ON_, FB_, FBSEL_ to GND PGND to GND DL_ to PGND LXSU Current(Note 1) LXSU Current(Note 1) REF, OSC, COMP_ to GND Continuous Power Dissipation(TA = +70℃) 32-Pin Thin QFN (derate 22mW/℃above +70℃) Operating Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (soldering, 10s) Ratings to + 85℃unless otherwise noted.) Unit V V V A A V mW ℃ ℃ ℃ ℃ -0.3V to +6V -0.3V to +0.3V -0.3V to OUTSU + 0.3V 3.6A 2.25A -0.3V to OUTSU + 0.3V 1700mW -40℃to + 85℃ +150℃ -65℃ to + 150℃ +300℃ Note 1: LXSU has internal clamp diodes to OUTSU and PGND, and LXSD has internal clamp diodes to INSD and PGND. Applications that forward bias these diodes should take care not to exceed the devices power dissipation limits. P2/21 Rev. C, Sep 2005 ML1565 Electrical Characteristics (VOUTSU = 3.3V, TA = 0℃ General Parameter Input Voltage Range Minimum Startup Voltage Overload Protection Fault Interval Thermal Shutdown Thermal Shutdown Hysteresis Shutdown Supply Current into OUTSU Step-Up DC-to-DC Supply Current into OUTSU Step-Up Plus 1 AUX Supply Current into OUTSU Step-Up Plus Step-Down Supply Current into OUTSU Reference Output Voltage Reference Load Regulation Reference Line Regulation OSC Discharge Trip Level OSC Discharge Resistance OSC Discharge Pulse Width OSC Frequency Condition to +85℃,unless otherwise noted.) Min 0.7 Typ. Max 5.5 Unit V V OSC cycles ℃ ℃ (Note 2) ILOAD