CDMA handset power
manager packs multiple LDOs
The ADP3502 CDMA power management system is a multifunction chip optimised for CDMA-1x cell phone power management in the handset baseband and RF sections
The device includes 11 low-dropout regulators (LDOs), each optimised for one CDMA subsystem, and four backup LDOs for standby mode operation. Integrated features include a real time clock for the system, serial bus interface, and charging control for Li-ion/Li-polymer batteries. Sophisticated controls are available for power-up during battery charging, keypad interface, and include a general-purpose input/output (GPIO/NT) function.
The ADP3502 has a high level of integration, which significantly reduces the design effort, number of discrete components and solution size/cost.
The main-sub LDO structure reduces the standby current consumption and as a result, greatly extends the standby time of the phone.
System operation is fully compatible with MSM51xx-based designs.
The ADP3502 is priced at $5.37 per unit in 1000-piece quantities, is specified over a wide temperature range of -30 to +85C, and is available now in a 64-lead TQFP.
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