MAX1958

www.DataSheet4U.com 19-2659; Rev 0; 10/02 KIT ATION EVALU E L B A IL AVA W-CDMA/N-CDMA Cellular Phone HBT PA Management ICs General Description Features o Step-Down Converter Dynamically Adjustable Output Voltage from 0.75V to 3.4V (MAX1958) Dynamically Adjustable Output Voltage from 1V to 3.6V (MAX1959) 800mA Guaranteed Output Current 130mV IC Dropout at 600mA Load Low Quiescent Current 190µA (typ) in Skip Mode (MAX1958) 3mA (typ) in PWM Mode 0.1µA (typ) in Shutdown Mode 1MHz Fixed-Frequency PWM operation 16% to 100% Duty-Cycle Operation No External Schottky Diode Required Soft-Start o Operational Amplifier 5mA Rail-to-Rail Output Active Discharge in Shutdown 800kHz Gain-Bandwidth Product 120dB Open-Loop Voltage Gain (RL = 100kΩ) o Temperature Sensor Accurate Sensor -11.7mV/°C Slope -40°C to +125°C-Rated Temperature Range o 20-Pin Thin QFN (5mm ✕ 5mm), 0.8mm Height (max) MAX1958/MAX1959 The MAX1958/MAX1959 power amplifier (PA) powermanagement ICs (PMICs) integrate an 800mA, dynamically adjustable step-down converter, a 5mA Rail-toRail® operational amplifier (op amp), and a precision temperature sensor to power a heterojunction bipolar transistor (HBT) PA in W-CDMA and N-CDMA cell phones. The high-efficiency, pulse-width modulated (PWM), DCto-DC buck converter is optimized to provide a guaranteed output current of 800mA. The output voltage is dynamically controlled to produce any fixed-output voltage in the range of 0.75V to 3.4V (MAX1958) or 1V to 3.6V (MAX1959), with s...