MAX1777, MAX1977, MAX1999 High-Efficiency, Quad Output, Main Power-Supply Controllers For Notebook Computers

The MAX1777 MAX1977 MAX1999 dual Step-down switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX1777 MAX1977 MAX1999 include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear Regulators providing 5V and 3.3V always-on outputs. Each linear Regulator provides up to 100mA output current with Automatic linear Regulator bootstrapping to the main SMPS outputs. The MAX1777 MAX1977 MAX1999 include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown.
Maxim's proprietary Quick-PWM quick-response, constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic pulse-skipping mode maintains the switching frequency above 25kHz, which eliminates noise in Audio applications. Other features include pulse skipping, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications.
The MAX1777 features a 200kHz/5V and 300kHz/3.3V SMPS for highest efficiency, while the MAX1977 features a 400kHz/5V and 500kHz/3.3V SMPS for thin and light applications. The MAX1999 provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respectively. The MAX1777 MAX1977 MAX1999 are available in 28-pin QSOP packages and operate over the extended temperature range (-40C to +85C). The MAX1777 MAX1977 MAX1999 are available in lead-free packages.
By Maxim Integrated Products
MAX1999 's PackagesMAX1999 's pdf datasheet
MAX1999EEI QSOP
MAX1999EEI-T QSOP
MAX1999EEIT QSOP




MAX1999 Pinout, Pinouts
MAX1999 pinout,Pin out
This is one package pinout of MAX1999,If you need more pinouts please download MAX1999's pdf datasheet.

MAX1999 Application circuits
MAX1999 circuits
This is one application circuit of MAX1999,If you need more circuits,please download MAX1999's pdf datasheet.


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