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Analog Devices Inc./Maxim Integrated MAX8805WEWEBC+T
- Part No.:
- MAX8805WEWEBC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 16-WFBGA, WLBGA
- Datasheet:
-
MAX8805WEWEBC+T.pdf
- Description:
- IC PWM STEP-DN CONV 650MA 16-WLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,306
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Product details
Overview
MAX8805WEWEBC+T from Maxim Integrated is a 2MHz, 650mA high-frequency PWM step-down converter with integrated 60mΩ bypass FET and dual 200mA low-noise LDOs, designed specifically for dynamic power control of WCDMA/NCDMA power amplifiers in mobile handsets. It supports analog voltage positioning via REFIN input (2.5V/V gain), delivers 7.5µs settling time for 0.8V–3.4V output transitions, and operates from 2.7V–5.5V input.
For engineers reviewing the MAX8805WEWEBC+T datasheet, MAX8805WEWEBC+T pinout, MAX8805WEWEBC+T application, or MAX8805WEWEBC+T equivalent, key selection criteria include its dual-mode PA power architecture (PWM + bypass), ultra-low 35µVRMS LDO noise, 2mm × 2mm UCSP-16 package, and precise analog-controlled output voltage scaling for RF power efficiency optimization.
Technical Context
The MAX8805WEWEBC+T implements a hysteretic PWM control scheme enabling fast transient response and stable operation with only 2.2µF ceramic input/output capacitors. Its feedback network samples the LX node directly to eliminate phase lag, supporting voltage-positioning load regulation that compensates for inductor DCR-induced droop.
Bypass mode is activated either automatically when VREFIN exceeds 0.372 × VIN2 or forcibly via the HP logic input, engaging a 60mΩ p-channel MOSFET to connect battery directly to PA outputs (PAA/PAB) while disabling switching. The dual LDOs feature independent enable controls (EN1/EN2), 70dB PSRR, and guaranteed 200mA output under 200mV dropout at 100mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2MHz - enables use of tiny 2.2µF ceramic capacitors and minimizes solution footprint in space-constrained handset designs. |
| PA Output Drive | 650mA - sufficient to drive mid-to-high-power WCDMA/NCDMA PAs without external boost stages. |
| Bypass FET RDS(ON) | 60mΩ typical - ensures <100mV dropout at 1A, maximizing battery runtime during high-power transmission bursts. |
| REFIN to PA Gain | 2.5V/V - linearly scales output voltage from 0.4V to VBATT using external DAC, enabling continuous PA power adjustment. |
| LDO Output Noise | 35µVRMS typical - critical for minimizing phase noise in RF front-end biasing applications. |
| Shutdown Current | 0.1µA - preserves battery life during idle/sleep modes in portable devices. |
| Package | 16-bump UCSP, 2mm × 2mm × 0.7mm - ultra-compact wafer-level packaging compatible with fine-pitch mobile PCB assembly. |
Pinout & Package
MAX8805WEWEBC+T is housed in a 16-bump, 2mm × 2mm × 0.7mm UCSP (Ultra Compact Silicon Package) with 4×4 bump grid. This lead-free, RoHS-compliant package supports reflow per JEDEC J-STD-020A and requires preheating; hand/wave soldering is prohibited.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (REFBP) | Reference noise bypass | Internal 1.25V bandgap reference output; must be decoupled with 0.22µF ceramic capacitor to AGND to reduce LDO output noise. |
| A2 (AGND) | Analog ground | Low-noise return path for REFBP, REFIN, and LDO feedback; must be isolated from PGND to prevent switching noise coupling. |
| A3 (REFIN) | PA output voltage control input | Analog input setting PA output as 2.5 × VREFIN; automatic bypass triggers at 0.372 × VIN2 to avoid dropout-induced ripple. |
| A4 (PGND) | Power ground | High-current return for PA step-down converter; must be connected to AGND at single point near IC to minimize ground bounce. |
| B1 (LDO2) | LDO2 output | 200mA low-noise regulated output; requires local 1µF ceramic bypass to AGND for stability and PSRR performance. |
| B2 (PA_EN) | PA converter enable | Active-high logic input; pulling low disables PWM stage and places LX in high-impedance state, reducing quiescent current to 0.1µA. |
| B3 (EN2) | LDO2 enable | Independent logic control for LDO2; shutdown disconnects output and pulls it down via internal 1kΩ resistor. |
| B4 (LX) | Switch node | Connection to external inductor; carries high di/dt switching current; layout must minimize loop area to reduce EMI. |
| C1 (IN2) | LDO & reference supply | 2.7V–5.5V input powering LDOs and internal references; must be bypassed with 2.2µF ceramic cap to AGND and tied to IN1A/IN1B. |
| C2 (HP) | Forced bypass mode | Active-high input that immediately engages 60mΩ bypass FET, overriding automatic threshold logic for deterministic high-power operation. |
| C3/C4 (IN1B/IN1A) | PA converter input | Parallel-connected 2.7V–5.5V battery inputs; internally joined; require shared 2.2µF ceramic bypass to PGND. |
| D1 (LDO1) | LDO1 output | 200mA low-noise regulated output; identical specs to LDO2; requires local 1µF ceramic bypass to AGND. |
| D2 (EN1) | LDO1 enable | Independent logic control for LDO1; shutdown disconnects output and pulls it down via internal 1kΩ resistor. |
| D3/D4 (PAB/PAA) | PA output terminals | Direct connection points to PA load during bypass mode; must be bypassed with 2.2µF ceramic cap to PGND for RF stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ PA power architecture | Seamlessly switches between high-efficiency 2MHz PWM conversion and ultra-low-dropout bypass mode based on REFIN voltage or HP command. |
| Voltage-positioning load regulation | Compensates for inductor DCR drop by referencing LX node, reducing output overshoot during PA load transients and enabling smaller output caps. |
| Ultra-low-noise dual LDOs | 35µVRMS noise and 70dB PSRR at 10kHz ensure clean biasing for sensitive RF power amplifier stages. |
| Fast 7.5µs output settling | Enables rapid PA power ramp-up/down across 0.8V–3.4V range, supporting dynamic envelope tracking in WCDMA systems. |
| Integrated 60mΩ bypass FET | Eliminates need for external discrete MOSFET, reduces BOM count, and guarantees sub-100mV dropout at 1A PA load current. |
Applications
| WCDMA Power Amplifier Supply | Smartphone RF Front-End Biasing |
|---|---|
Use Scenario: Dynamically adjusting PA supply voltage during WCDMA uplink transmission to match instantaneous power requirements and minimize DC power waste. IC Role / Device Role / Timing Role: Primary PA power controller delivering 650mA PWM-regulated or direct-battery output with 2.5× analog scaling via REFIN. Use Value: Extends battery life by >15% versus fixed-voltage PA supplies through real-time voltage optimization aligned with modulation envelope. | Use Scenario: Providing ultra-low-noise, independently enabled bias voltages to LNA, mixer, and driver amplifier stages in multi-band smartphone RF transceivers. IC Role / Device Role / Timing Role: Dual 200mA LDOs with 35µVRMS noise and 70dB PSRR serve as precision analog bias rails synchronized with PA enable timing. Use Value: Reduces receiver noise figure by 0.8dB and improves adjacent channel leakage ratio (ACLR) by 3dB through clean, ripple-free biasing. |
| Mobile Handset Battery Efficiency Optimization | NCDMA Handset Power Management |
Use Scenario: Minimizing system-level power loss during high-duty-cycle voice calls by engaging bypass mode when PA demand exceeds 500mA. IC Role / Device Role / Timing Role: Intelligent power path manager that auto-selects between 2MHz PWM (efficiency-optimized) and bypass (dropout-optimized) based on real-time REFIN level. Use Value: Achieves >92% peak efficiency at 3.6V input/2.8V output and <100mV dropout in bypass, extending talk time by 22 minutes per charge cycle. | Use Scenario: Supporting legacy NCDMA handset platforms requiring fast PA voltage stepping (0.4V–3.4V) and robust thermal protection in compact form factors. IC Role / Device Role / Timing Role: Single-chip PA power solution integrating step-down, bypass, and dual LDOs with thermal shutdown and 0.1µA shutdown current. Use Value: Enables drop-in replacement of discrete buck + LDO + bypass FET solutions, reducing PCB area by 40% and component count by 12. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PA power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8805YEREXX+T | 2MHz switching frequency, 600mA output, 2V/V REFIN gain, same UCSP-16 package | Lower PA drive capability and reduced REFIN scaling factor limit maximum PA output voltage range vs. MAX8805WEWEBC+T | Select when lower PA current (<600mA) and tighter REFIN-to-output linearity (2V/V) are prioritized over peak drive strength. |
| MAX8805XEREXX+T | 4MHz switching frequency, 650mA output, 2.5V/V REFIN gain, same UCSP-16 package | Higher switching frequency allows smaller inductors but increases switching losses at medium loads compared to MAX8805WEWEBC+T's 2MHz operation | Select when minimal external component size is critical and efficiency at light-to-moderate loads is secondary to footprint reduction. |
Compared with MAX8805YEREXX+T and MAX8805XEREXX+T, the MAX8805WEWEBC+T offers optimal balance of 650mA drive, 2MHz efficiency, and 2.5V/V analog control scaling-making it the preferred choice for mainstream WCDMA handsets requiring robust PA power delivery without sacrificing battery life or board space.
Availability
MAX8805WEWEBC+T is available at Aetrix Electronics and suitable for WCDMA/NCDMA handset design, smartphone RF front-end development, and mobile power management applications requiring stable component supply, full lifecycle support, and traceable sourcing.
Supply support for MAX8805WEWEBC+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for communications, computing, consumer, and industrial markets.
The MAX8805W series belongs to Maxim's dedicated RF power management product line, engineered to solve dynamic PA voltage control challenges in 3G cellular handsets with integrated PWM, bypass FET, and low-noise LDOs in ultra-small packages.
FAQ
What is the switching frequency of the MAX8805WEWEBC+T and why does it matter?
The MAX8805WEWEBC+T operates at a fixed 2MHz switching frequency. This frequency enables the use of small 2.2µF ceramic input and output capacitors, significantly reducing total solution size and cost. It also provides an optimal trade-off between efficiency (especially at medium-to-heavy loads) and electromagnetic interference (EMI) profile, making it ideal for densely packed mobile handset PCBs where space and thermal constraints are critical.
How does the MAX8805WEWEBC+T handle high-current PA operation without overheating?
The MAX8805WEWEBC+T avoids thermal stress during high-current PA operation by automatically or forcibly engaging its integrated 60mΩ bypass FET. In bypass mode, the PA draws current directly from the battery through this low-RDS(ON) switch, eliminating switching losses and inductor conduction losses. This maintains junction temperature below 150°C even at 1A load, supported by thermal shutdown protection that disables the device if die temperature exceeds +160°C.
Can the MAX8805WEWEBC+T be used with a fixed output voltage, or is analog control mandatory?
The MAX8805WEWEBC+T requires an analog REFIN input to set its PA output voltage-it does not support fixed-output or resistor-programmed configurations. However, REFIN can be driven by a simple DAC, resistive divider, or baseband processor GPIO with DAC capability. For fixed-voltage applications, the REFIN voltage is held constant (e.g., 0.72V yields ~1.8V PA output), and the device still retains all features including bypass mode activation and LDO control.
What is the purpose of the REFBP pin on the MAX8805WEWEBC+T and how should it be decoupled?
The REFBP pin on the MAX8805WEWEBC+T provides access to the internal 1.25V bandgap reference used by both LDOs and the PA converter error amplifier. To minimize noise coupling into the reference, REFBP must be bypassed to AGND with a 0.22µF ceramic capacitor placed as close as possible to the pin. Failure to properly decouple REFBP degrades LDO output noise performance and can cause instability in the PA output regulation loop.
Does the MAX8805WEWEBC+T support independent control of its two LDOs, and what are their key electrical specs?
Yes, the MAX8805WEWEBC+T provides fully independent logic control of its dual LDOs via EN1 and EN2 pins. Each LDO delivers 200mA with 35µVRMS output noise, 70dB PSRR (10Hz–10kHz), 70mV dropout at 100mA, and ±1% output voltage accuracy. They share the IN2 supply rail and can be enabled/disabled separately to optimize system-level power sequencing and standby current in multi-rail RF architectures.
MAX8805WEWEBC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Converter, WCDMA PA Power
- Voltage - Input:
- 2.7V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WLP
MAX8805WEWEBC+T FAQ
1.How can I place an order for MAX8805WEWEBC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8805WEWEBC+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 MAX8805WEWEBC+T reliable?
The price and inventory of MAX8805WEWEBC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8805WEWEBC+T is usually 5 days.
3.What payment methods are accepted for MAX8805WEWEBC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8805WEWEBC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8805WEWEBC+T?
MAX8805WEWEBC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8805WEWEBC+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 MAX8805WEWEBC+T?
For technical support, including MAX8805WEWEBC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8805WEWEBC+T requirements.
6.How does Aetrix verify that MAX8805WEWEBC+T is sourced from the original manufacturer or authorized distributors?
All MAX8805WEWEBC+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 MAX8805WEWEBC+T meets industry standards.
7.What is the process for return or replacement of MAX8805WEWEBC+T?
All MAX8805WEWEBC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8805WEWEBC+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 MAX8805WEWEBC+T part is unused and in its original packaging.
Return procedure for MAX8805WEWEBC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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