MAX8660

The MAX8660 power management ICs (PMICs) power applications processors (APs) in smart cellular phones, PDAs, Internet appliances, and other portable devices.Four step-down DC-DC outputs, three linear regulators, and an 8th always-on LDO are integrated with powermanagement functions. Two dynamically controlled DCDC outputs of MAX8660 power the processor core and internal memory.Two other DC-DC converters power I/O, memory, and other peripherals.

Features of the MAX8660 are:(1)optimized for marvell's PXA300 and armada 100 family of processors; (2)protected to 7.5V--Shutdown above 6.3V; (3)four synchronous step-down converters REG1, REG2, REG3, REG4; (4)four LDO regulators REG5, REG6, REG7, REG8; (5)2MHz switching allows small components; (6)low, 20A Deep-sleep current; (7)low-battery monitor and reset output.All step-down DC-to-DC outputs use fast 2MHz PWM switching and tiny external components. MAX8660 automatically switch from PWM to high-efficiency, light-load operation to reduce operating current and extend battery life. In addition, a forced-PWM option allows lownoise operation at all loads. Overvoltage lockout protects the device against inputs up to 7.5V.

The absolute maximum ratings of the MAX8660 can be summarized as:(1)operating temp:-40 to 85;(2)PV1 to PG1:-0.3V to +7.5V;(3)PV, PV1, PV2, PV3, PV4, IN8 to IN:-0.3V to +0.3V;(4)GND to AGND:-0.3V to +0.3V;(5)PV, PV1, PV2, PV3, PV4, IN8 to IN:-0.3V to +0.3V;(6)storage temp:-65 to 150;(7)lead temperature (soldering, 10s):+260.Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the MAX8660. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Internal n-channel synchronous rectifiers eliminate the need for external Schottky diodes and improve efficiency.The synchronous rectifier of MAX8660 turns on during the second half of each switching cycle (off-time). During this time, the voltage across the inductor is reversed, and the inductor current ramps down. In PWM mode, the synchronous rectifier turns off at the end of the switching cycle. In normal mode, the synchronous rectifier turns off when the inductor current falls below 25mA or at the end of the switching cycle, whichever occurs first.