MAX1565:Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply

Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply Integrates Ultra-High-Efficiency Step-Up/Step-Down DC-DC Converters Along with Three Auxiliary Step-Up Controllers

The MAX1565 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 MAX1565 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 soft-start ramp minimizes surge current from 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 MAX1565 features auxiliary step-up controllers that power CCD, LCD, motor actuator, and backlight circuits. The device also features low-cost expandability by supplying power, an oscillator signal, and a reference to the MAX1801 SOT23 slave controller that supports step-up, SEPIC, and flyback configurations. The MAX1565 is available in a space-saving 32-pin thin QFN package.

Key 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 from 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, 5mm x 5mm Thin QFN Package
MAX1565: Typical Operating Circuit
MAX1565: Typical Operating Circuit
  • Digital Still Cameras
  • Digital Video Cameras
  • PDAs
titleDownload file
MAX1565 Data SheetMAX1565.pdf
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesLCD/LED/Flash/CCD FeaturesVIN
Oper. Freq.
minmaxminmaxSee Notes
Low Batt./POK Output
Output OVP
Output UVP
Adj. Frequency
Current Limit
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
TFT Bias0.75.51.2550.80.81000TQFN/32$2.61 @1k
Design kits & evaluation modules
Related Products
  • MAX1800:Digital Camera Step-Up Power Supply
  • MAX1802:Digital Camera Step-Down Power Supply
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1565ETJNo Longer AvailableMAX1565ETJ+TQFN,;32 pin;26 mm²-40°C to +85°CNo
MAX1565ETJ+ActiveTQFN,;32 pin;26 mm²-40°C to +85°CLead Free
MAX1565ETJ+TActiveTQFN,;32 pin;26 mm²-40°C to +85°CLead Free
MAX1565ETJ-TNo Longer AvailableMAX1565ETJ+TQFN;32 pin-40°C to +85°CSee data sheet
MAX1565.pdf MAX1565
典型工作电路 MAX1565