The MAX1901EAI+ is a high performance, 500KHz multi output, low noise power supply controller for notebook computers in 28 pin SSOP package. This buck topology, step-down, switch mode power supply controller generates logic supply voltages in battery powered systems. It includes on-board power-up sequencing, power good signalling with delay, digital soft start, secondary winding control, low dropout circuitry, internal frequency compensation networks & automatic bootstrapping. Up to 97% efficiency is achieved through synchronous rectification and Maxim's Idle Mode control scheme. Efficiency is greater than 80% over 1000:1 load current range which extends battery life in system suspend or standby mode. It includes two PWM regulators, adjustable from 2.5V to 5.5V with fixed 5V and 3.3V modes. It includes secondary feedback input (SECFB) plus control pin (STEER) that selects which PWM (3.3V or 5V) receives secondary feedback signal.
- Supply voltage range from 4.2V to 30V
- Operating temperature range from -40°C to 85°C
- Adjustable secondary feedback, logic controlled & synchronized fixed frequency PWM operating mode
- 5V/50mA linear regulator output and precision 2.5V reference output
- Programmable power-up sequencing and power good (active-low RESET) output
- Output overvoltage protection and output undervoltage shutdown mode
- 333KHz (SYNC = 0)/500KHz (SYNC = VL) low noise fixed frequency operation
- Maximum duty factor of 97% (SYNC = VL) and 98% (SYNC = 0)
- 2.5mW typical quiescent power (12V input, both SMPS on) at TA = 0°C to +85°C
- 4μA typical shutdown current at TA = 0°C to 85°C
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