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MAX1959

Part Number	MAX1959
Manufacturer	Maxim Integrated Products
Description	(MAX1958 / MAX1959) W-CDMA/N-CDMA Cellular Phone HBT PA Management ICs
Published	Oct 27, 2006
Detailed Description	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 Manageme...
Datasheet	MAX1959 PDF File

Overview

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 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 synchronous rectifier to maximize efficiency and minimize external component count.
The 100% duty-cycle operation allows for an IC dropout voltage of only 130mV (typ) at 600mA load.
The micropower op am...

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