LTC4401-1ES6

Product Summary

The LTC4401-1ES6 is a RF Power Controller. The LTC4401-1ES6 is a SOT-23 RF power controller for slow turn-on RF power amplifiers operating in the 300MHz to 2.7GHz range. The loop bandwidth is set at 250kHz to improve frequency stability when controlling slow turn-on RF power amplifiers such as the Conexant CX77301/CX77302, CX77304, CX77314, Anadigics AWT6107 and the RF Micro Devices RF3160. RF power is controlled by driving the RF amplifier power control pins and sensing the resultant RF output power via a directional coupler. The RF sense voltage is peak detected using an on-chip Schottky diode. This detected voltage is compared to the DAC voltage at the PCTL pin to control the output power. The RF power amplifier is protected against high power control pin voltages. Internal and external offsets are cancelled over temperature by an autozero control loop, allowing accurate low power programming. The shutdown feature disables the part and reduces the supply current to <10μA. The applications of the LTC4401-1ES6 include GSM/GPRS Cellular Telephones, PCS Devices, Wireless Data Modems and U.S. TDMA Cellular Phones.

Parametrics

LTC4401-1ES6 absolute maximum ratings: (1)VCC to GND: – 0.3V to 6.5V; (2)VPCA/B Voltage to GND: – 0.3V to 3.2V; (3)PCTL Voltage to GND: – 0.3V to (VCC + 0.3V); (4)RF Voltage to GND: (VCC – 2.6V) to 7V; (5)BSEL, SHDN Voltage to GND: – 0.3V to (VCC + 0.3V); (6)IVPCA/B: 10mA; (7)Operating Temperature Range (Note 2): –30℃ to 85℃; (8)Storage Temperature Range: –65℃ to 150℃; (9)Maximum Junction Temperature: 125℃; (10)Lead Temperature (Soldering, 10 sec): 300℃.

Features

LTC4401-1ES6 features: (1)Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets; (2)Wide VCC Range: 2.7V to 6V; (3)Automatic Bandwidth Control Improves Low Power Ramp Response; (4)Allows Direct Connection to Battery; (5)RF Output Power Set by External DAC; (6)Internal Frequency Compensation; (7)Rail-to-Rail Power Control Output; (8)Power Control Signal Overvoltage Protection; (9)Low Operating Current: 1mA; (10)Low Shutdown Current: 10μA; (11)Two Pole PCTL Input Filtering.

Diagrams