The MAX17085BETL+ is an integrated charger, dual main step-down controller and dual LDO regulator in 40 pin TQFN package. It is an all-in-one notebook power solution integrating a multichemistry battery charger, dual fixed output Quick-PWM step-down controllers and dual keep-alive linear regulators. The high-frequency 1.4MHz multichemistry battery charger uses a current-mode, fixed inductor current ripple architecture. Low-offset sense amplifiers allow the use of low-value sense resistors for charging and input current limit. The dual Quick-PWM step-down controllers with synchronous rectification generate the 5V and 3.3V main power in a notebook. Low side MOSFET sensing provides a simple low-cost, highly efficient valley current-limit protection. An internal 5V/100mA LDO5 with switchover can be used to either generate the 5V bias needed for power-up or other lower power "always-on" suspend supplies. Another 3.3V/50mA LDO3 provides "always-on" power to a system microcontroller.
Feature
- AC adapter overvoltage and overcurrent protection
- Operating temperature range from -40°C to 85°C
- Dual quick PWM with fast transient response and extended on-time
- Switching frequency is 300KHz to 800KHz
- Low noise ultrasonic mode
- Autoretry fault protection
- Automatic selection of system power source
- Internal charge pump for adapter n-channel MOSFETs drive
- Monitor o/ps for AC adapter current (±2% accuracy), battery discharge current (±2% accuracy)
- Analogue/PWM (100Hz to 500KHz) adjustable charge current setting
Applications
- 2-to-4, Li+-Cell, Battery-Powered Devices
- 5V and 3.3V Supplies
- Notebook Computers
- PDAs and Mobile Communicators
