MAX1685EEE+T

Product Summary

The MAX1685EEE+T are high-efficiency, internalswitch, PWM step-down switching regulators intended to power cellular phones, communicating PDAs, and handy-terminals. The MAX1685EEE+T delivers a guaranteed 1A output current from two Li-Ion batteries. Their wide input voltage range of 2.7V to 14V gives design flexibility and allows batteries to charge from a wall cube, since the ICs operate at the higher voltages that occur when the battery is removed. The MAX1685EEE+T output voltage is preset to 3.3V or can be externally adjusted from 1.25V to VIN. The MAX1685EEE+T runs at 600kHz to allow use of smaller external components. These devices can also be synchronized to an external clock. Other features include a 100% duty cycle for low-dropout applications, an auxiliary 3V/5mA output, and a 1% accurate reference.

Parametrics

MAX1685EEE+T absolute maximum ratings: (1)AIN to AGND: -0.3 to +15V; (2)IN to PGND: -0.3V to (VAIN + 0.3V); (3)LX to PGND: -0.5V to (VIN + 0.3V); (4)PGND to AGND: ±0.3V; (5)SHDN to AGND: -0.3V to (VAIN + 0.3V); (6)ILIM/SS, FB, CC, BOOT, REF to AGND: -0.3V to (VCVL+ 0.3V); (7)CVH to IN: -6V to +0.3V; (8)CVL, STBY, SYNC/PWM to AGND: -0.3V to +6V; (9)Reference Current: ±1mA; (10)CVL Current: 10mA to -1mA; (11)LX Peak Current (Internally Limited): 2.3A; (12)Continuous Power Dissipation (TA = +70℃), 16-Pin QSOP (derate 8.3mW/℃ above +70℃): 667mW; (13)Operating Temperature Range: -40℃ to +85℃; (14)Junction Temperature: +150℃; (15)Storage Temperature Range: -65℃ to +150℃; (16)Lead Temperature (soldering, 10sec ): +300℃.

Features

MAX1685EEE+T features: (1)Up to 96% Efficiency; (2)1A Guaranteed Output Current; (3)100% Duty Cycle in Dropout; (4)2.7V to 14V Input Range (15V absolute max); (5)1% Accurate Reference Output; (6)0.24Ω P-Channel On-Resistance; (7)Synchronizable Switching Frequency; (8)Fixed-Frequency PWM Operation: 300kHz (MAX1684); 600kHz (MAX1685); (9)150μA Normal Mode Quiescent Current; (10)25μA Low-Power Mode Quiescent Current; (11)2μA Shutdown Current; (12)Dual ModeFixed 3.3V (%) Output or Adjustable Output (1.25V to VIN); (13)Small 16-QSOP Package; (14)Auxiliary Output (CVL): 3V/5mA.

Diagrams