Smallest 6-Channel, 2-Cell Li+ PMIC for Digital SLR Cameras

The MAX8682 power-management IC (PMIC) provides a compact and complete power-supply solution for Digital Single-Lens Reflex (DSLR) cameras. Six DC-DC converters with internal switches provide up to 94% efficiency to generate the critical power-supply voltages required in DSLR camera systems. The two H-bridge and three step-down DC-DC converters are internally compensated and switch only as necessary at light loads to optimize efficiency. The H-bridge channels utilize Maxim’s proprietary H-bridge topology, providing a seamless transition through all operating modes without the glitches commonly seen in competing H-bridge converters.

All six converters offer True Shutdown™ short-circuit protection, and overload protection. To prevent current runaway in the event of a hard short, channels 1 and 2 latch off immediately if the output voltage drops below 1.25V anytime after startup. The white LED step-up converter provides regulated current and dimming control. If a short-circuit condition is detected on the output capacitor of the white LED converter, only this converter turns off. If a short or overload condition is detected on any other output for at least 66ms, the PMIC turns off all converters.

Applications

* 2-Cell Li+ DVC * Digital SLR Cameras

* 4V to 14V Input Voltage Range

* Internal MOSFET H-Bridge Converters for Up to 94% Efficiency

* Minimal Output Ripple Variation on H-Bridge Converters

* No Mode Transition Glitches on Proprietary H-Bridge

* Internal Compensation on Channels 1–5

* Fast Line-Transient and Load-Transient Response

* True Shutdown on All Converters

* Internal Soft-Start and Short-Circuit Protection on All Outputs

* Individual ON/OFF Control

* Fault Blanking

* ±2% Regulated LED Current for Six White LEDs

* 2% Switching Frequency Accuracy

* 3µA Shutdown Current

* Small, 48-Pin 6mm x 6mm TQFN Package