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MAX1958 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1958 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 24 page General Description The MAX1958/MAX1959 power amplifier (PA) power- management ICs (PMICs) integrate an 800mA, dynami- cally adjustable step-down converter, a 5mA Rail-to- Rail® 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), DC- to-DC buck converter is optimized to provide a guaran- teed output current of 800mA. The output voltage is dynamically controlled to produce any fixed-output volt- age in the range of 0.75V to 3.4V (MAX1958) or 1V to 3.6V (MAX1959), with settling time less than 30µs for a full-scale change in voltage and current. The 1MHz PWM switching frequency allows the use of small external components while pulse-skip mode reduces quiescent current to 190µA with light loads. The converter utilizes a low on-resistance internal MOSFET switch and synchro- nous rectifier to maximize efficiency and minimize external component count. The 100% duty-cycle opera- tion allows for an IC dropout voltage of only 130mV (typ) at 600mA load. The micropower op amp is used to provide bias to the HBT PA to maximize efficiency. The amplifier features active discharge in shutdown for full PA bias control. It has 5mA rail-to-rail drive capability, 800kHz gain-band- width product, and 120dB open-loop voltage gain. The precision temperature sensor measures tempera- tures between -40°C to +125°C, with linear tempera- ture-to-voltage analog output characteristics. The MAX1958/MAX1959 are available in a 20-pin 5mm ✕ 5mm thin QFN package (0.8mm max height). Applications W-CDMA and N-CDMA Cellular Phones Wireless PDAs and Modems 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 = 100k Ω) 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) W-CDMA/N-CDMA Cellular Phone HBT PA Management ICs ________________________________________________________________ Maxim Integrated Products 1 13 12 11 14 15 LX IN INP PWM PGND 4 3 2 1 TOUT AGND SHDN2 AOUT 5 REF MAX1958/ MAX1959 TOP VIEW THIN QFN 5mm x 5mm Pin Configuration Ordering Information 19-2659; Rev 0; 10/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE MAX1958ETP -40 °C to +85°C 20 Thin QFN-EP* MAX1959ETP -40 °C to +85°C 20 Thin QFN-EP Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. Typical Operating Circuit and Functional Diagram appear at end of data sheet. EVALUATION KIT AVAILABLE *EP = Exposed paddle. |
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