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Analog Devices Inc./Maxim Integrated MAX4473ETA-T
- Part No.:
- MAX4473ETA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX4473ETA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
MAX4473ETA-T from Maxim Integrated is a voltage-controlled, unidirectional high-side current-setting amplifier for closed-loop bias control of GSM power amplifiers. It delivers precise PA supply current regulation via external sense/gain resistors, features rail-to-rail PC input and error amplifier output, operates from 2.7V–6.5V, draws 1.2mA typical supply current, and supports fast 0.9µs enable/disable timing in TDMA burst applications.
For engineers reviewing the MAX4473ETA-T datasheet, MAX4473ETA-T pinout, MAX4473ETA-T application, or MAX4473ETA-T equivalent, this device is selected for GSM transmit burst shaping, precision current control in RF front-ends, and low-voltage PA bias management where shutdown leakage <1µA and 1V–VCC common-mode sensing are critical.
Technical Context
The MAX4473ETA-T implements a three-stage analog control loop: an input buffer (A1) scales the PC voltage by 1/4; a V-to-I converter (A2 + Q1) sets current through RG3; and a rail-to-rail error amplifier (A3) compares SR1/SR2 voltages to regulate PA gain. Its architecture decouples PA current from supply voltage variation via the equation ICCPA = (VPC·RG1)/(4·RSENSE·RG3).
It supports true high-side sensing with 1V–VCC common-mode range at SR1/SR2, no phase reversal from 0V to VCC, and active pull-down at OUT during shutdown. The 2MHz gain-bandwidth product and 1.8V/µs slew rate ensure stable servo-loop response up to GSM burst frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 6.5V - Enables direct integration into single-supply GSM handset rails without level-shifting. |
| Supply Current (Active) | 1.2mA typical - Minimizes battery drain in portable RF transmitters during active transmit bursts. |
| Shutdown Supply Current | <1µA - Ensures negligible standby power in time-division systems between transmit slots. |
| Enable/Disable Time | 0.9µs typical - Matches GSM 577µs burst timing with margin for control latency. |
| Input Common-Mode Range | 1V to VCC at SR1/SR2 - Supports high-side sensing across full battery voltage range (e.g., Li-ion 3.0V–4.2V). |
| Error Amplifier Output Swing | Rail-to-rail - Delivers full dynamic range to PA gain control pin without headroom loss. |
| PC Input Bandwidth | 2MHz - Accommodates fast power ramping profiles required for GSM EDGE modulation. |
Pinout & Package
MAX4473ETA-T is housed in an 8-pin, 3mm × 3mm, 0.8mm-thick thin QFN package with exposed thermal pad (T833-1), optimized for RF board density and thermal performance in cellular handsets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SR1 | Inverting input of error amplifier / Drain of V-to-I FET (Q1) | Connects to supply side of RSENSE via RG1; senses high-side current drop with 1V–VCC common-mode tolerance. |
| 2 - SR2 | Noninverting input of error amplifier | Connects to load side of RSENSE via RG2; enables differential current sensing independent of ground path noise. |
| 3 - SHDN | Active-low shutdown control | Pulling below 0.4V disables all internal amplifiers, turns off Q1, and actively pulls OUT to GND. |
| 4 - PC | Power control voltage input | Accepts 0–(VCC−0.15V) DC control voltage; internally divided by 4 to set reference for V-to-I conversion. |
| 5 - GND | Analog and power ground | Reference for all internal circuitry; must be connected to low-impedance system ground plane. |
| 6 - SR3 | Inverting input of V-to-I converter / Source of Q1 | Connected to GND via RG3; sets V-to-I conversion gain and defines current scaling factor in control equation. |
| 7 - OUT | Error amplifier output | Rail-to-rail output driving PA gain control pin; provides active pull-down in shutdown mode. |
| 8 - VCC | Positive supply input | 2.7V–6.5V operation; requires local 0.1µF ceramic bypass capacitor to GND for RF stability. |
Key Features
| Feature | Design Value |
|---|---|
| GSM-optimized timing | Guaranteed 1.5µs max enable/disable ensures compliance with GSM slot timing and minimizes inter-slot leakage. |
| Rail-to-rail PC input & OUT | Full utilization of control voltage range and output drive capability into 500Ω/300pF loads typical of PA gain pins. |
| High CMRR & PSRR | 80dB min CMRR and 75dB min PSRR suppress supply and common-mode noise in noisy RF environments. |
| External resistor programmability | RG1, RG2, RG3, and RSENSE allow precise tailoring of current range, accuracy, and efficiency per PA design. |
| No phase reversal | Stable operation with SR1/SR2 inputs from 0V to VCC, eliminating risk of latch-up during power-up or transient events. |
Applications
| GSM Cellular Handsets | Cordless Phone Base Stations |
|---|---|
Use Scenario: Regulating PA bias current during 577µs TDMA transmit bursts to meet GSM spectral mask and power ramp requirements. IC Role / Device Role / Timing Role: High-side current-setting amplifier providing closed-loop feedback to PA gain control pin with sub-microsecond response. Use Value: Enables accurate 0–33dBm output power control across battery voltage range while maintaining EVM and ACLR compliance. |
Use Scenario: Stabilizing RF output power in DECT 1.88–1.90GHz base station PAs under varying line voltage and temperature. IC Role / Device Role / Timing Role: Precision current regulator implementing voltage-controlled constant-current source for linear PA bias. Use Value: Reduces PA thermal drift-induced power variation to ±0.3dB over -10°C to +60°C ambient. |
| Precision Current Control | High-Frequency Servo Loops |
Use Scenario: Setting calibrated DC current in instrumentation-grade current sources requiring <0.5% full-scale accuracy. IC Role / Device Role / Timing Role: Programmable gain, high-CMRR error amplifier with external sense resistor for ultra-stable current regulation. Use Value: Achieves 0.1% typical current matching using 0.1% tolerance resistors and 0.5mV input offset voltage. |
Use Scenario: Closed-loop control of laser diode or RF switch bias in real-time adaptive systems with >100kHz update rates. IC Role / Device Role / Timing Role: Fast-settling error amplifier (2MHz GBW, 1.8V/µs slew) driving capacitive loads up to 300pF. Use Value: Maintains phase margin >60° and stable step response without external compensation in servo feedback paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PA power control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4472ETA-T | Same pinout and architecture but lacks rail-to-rail PC input; PC common-mode range limited to 0.3V–VCC−0.3V. | Not suitable for low-VPC (<0.5V) GSM burst shaping where full rail swing is needed for fine power resolution. | Select MAX4473ETA-T when PC input must operate down to 0V or up to VCC−0.15V with guaranteed linearity. |
| ADP1650ACPZ-R7 | Dual-channel LED driver with integrated current DAC; no external sense resistor support or high-side sensing capability. | Designed for flash LED bias, not RF PA control; lacks GSM-timed shutdown and burst-response optimization. | Choose MAX4473ETA-T for true high-side, resistor-programmable, burst-synchronized PA current control-not LED drivers. |
Compared with MAX4472ETA-T and ADP1650ACPZ-R7, the MAX4473ETA-T uniquely combines rail-to-rail PC input, 1V–VCC high-side sensing, and sub-microsecond enable timing-making it the only option qualified for GSM-compliant closed-loop PA bias in space-constrained QFN layouts.
Availability
MAX4473ETA-T is available at Aetrix Electronics and suitable for GSM cellular handsets, cordless phone base stations, and precision current control systems requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX4473ETA-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and RF ICs for automotive, industrial, communications, and consumer applications.
The MAX4473ETA-T belongs to Maxim's RF power control product line, engineered specifically for closed-loop GSM/DECT PA bias applications demanding low-voltage operation, rail-to-rail signal handling, and microsecond-level timing accuracy.
FAQ
What is the primary function of the MAX4473ETA-T in a GSM transmitter?
The MAX4473ETA-T serves as a voltage-controlled, high-side current-setting amplifier that regulates power amplifier (PA) supply current in closed-loop fashion. By comparing the voltage across an external sense resistor to a scaled version of the power control (PC) input voltage, it adjusts the PA gain to maintain precise current-and thus output power-during GSM TDMA transmit bursts. This ensures compliance with spectral mask and power ramp requirements.
Does the MAX4473ETA-T support true high-side current sensing?
Yes, the MAX4473ETA-T supports true high-side sensing via its SR1 and SR2 inputs, which accept common-mode voltages from 1V to VCC. This allows placement of the current-sense resistor between the supply rail and the PA-an essential configuration for avoiding ground path interference and enabling accurate current measurement independent of system ground noise.
What is the significance of rail-to-rail operation on the PC input and OUT pins of the MAX4473ETA-T?
Rail-to-rail operation on the PC input allows the full 0V to VCC−0.15V range to be used for power control voltage, maximizing resolution for fine-grained output power adjustment. Rail-to-rail output at OUT ensures the full supply range is delivered to the PA gain control pin, eliminating headroom loss and preserving dynamic range-critical for maintaining linearity in GSM EDGE modulation schemes.
How does the MAX4473ETA-T achieve low-power shutdown?
When SHDN is driven below 0.4V, the MAX4473ETA-T disables its internal amplifiers (A1, A2, A3), turns off the V-to-I FET (Q1), and activates an on-chip N-channel FET to actively pull the OUT pin to GND. This reduces total supply current to less than 1µA while ensuring the PA gain control node is held at a known safe state-preventing unintended PA conduction during idle slots.
Can the MAX4473ETA-T be used outside GSM applications?
Yes-the MAX4473ETA-T is applicable in any precision current control or high-frequency servo loop requiring programmable, high-side, closed-loop regulation. Its 2MHz bandwidth, 1.8V/µs slew rate, and 1V–VCC common-mode range make it suitable for laser diode bias, RF switch control, and instrumentation current sources-provided the external resistor network is configured per the ICCPA = (VPC·RG1)/(4·RSENSE·RG3) equation.
MAX4473ETA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- 400 nA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 1.2mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (3x3)
MAX4473ETA-T FAQ
1.How can I place an order for MAX4473ETA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4473ETA-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX4473ETA-T reliable?
The price and inventory of MAX4473ETA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4473ETA-T is usually 5 days.
3.What payment methods are accepted for MAX4473ETA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4473ETA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4473ETA-T?
MAX4473ETA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4473ETA-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX4473ETA-T?
For technical support, including MAX4473ETA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4473ETA-T requirements.
6.How does Aetrix verify that MAX4473ETA-T is sourced from the original manufacturer or authorized distributors?
All MAX4473ETA-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX4473ETA-T meets industry standards.
7.What is the process for return or replacement of MAX4473ETA-T?
All MAX4473ETA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4473ETA-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX4473ETA-T part is unused and in its original packaging.
Return procedure for MAX4473ETA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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