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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 208kB) Download   E-Mail

Description

The MAX4473 PA power control IC is intended for closed-loop bias control of GSM power amplifiers. The device facilitates accurate control of the current delivered to the power amplifier (PA) through a control voltage. The error amplifier senses the voltage drop across an external current-sense resistor placed between the supply and the PA. The output of the error amplifier adjusts the PA gain until the current is proportional to the power control voltage applied to the MAX4473. This unique topology is useful in time-division-multiple-access (TDMA) systems, such as GSM, where accurate transmit burst shaping and power control is required. User-selectable current sensing and gain setting resistors maximize flexibility. The MAX4473 operates from a single 2.7V to 6.5V supply and typically draws 1.2mA of supply current. The error amplifier has a common-mode range that extends from 1V to VCC. The power control input and error amplifier outputs swing rail-to-rail. A low-power shutdown mode reduces supply current to less than 1µA and activates an on-board active pull-down at the error amplifier output. Fast enable/disable times of 0.9µs reduce average power consumption without compromising dynamic performance. The MAX4473 is available in a space-saving 8-pin µMAX® package.

Key Features		Applications/Uses
Optimized for GSM Timing Requirements 2.7V to 6.5V Single-Supply Operation 1.2mA Supply Current ≤ 1µA Supply Current in Shutdown Mode Guaranteed 1.5µs Enable/Disable Times Active Output Pull-Down in Shutdown Mode Rail-to-Rail Error Amplifier Output Rail-to-Rail Power Control Input Output Drive Capability–500Ω and 300pF Loads 1V to VCC Current Sense Input Common-Mode Voltage Range No Phase-Reversal for Common-Mode Voltage from 0 to VCC External Current Sensing and Gain Setting Resistors Maximize Flexibility Available in a Space-Saving 8-Pin µMAX		Cordless Phones GSM Cellular Phones High-Frequency Servo Loops Precision Current Control

Diagram

Typical Operating Circuit

Application Notes

Application Note 1800: Smart IC Maintains Uniform Bias Current For GaAs MESFETs - MAX4473

Design Guides

Amplifiers and Sensors (PDF)

Reliability Reports

Show FIT data for: MAX4473 Request Reliability Report for: MAX4473

Software/Models

MAX4473 Macromodel MAX4473TST Test Circuit File

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-6 of 6

MAX4473	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX4473ESA			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX4473ESA-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX4473EUA+			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4473EUA+T			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4473EUA			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX4473EUA-T			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

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