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Analog Devices Inc./Maxim Integrated MAX853ESA+T
- Part No.:
- MAX853ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX853ESA+T.pdf
- Description:
- IC REG CHARGE PUMP ADJ 5MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,681
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Product details
Overview
MAX853ESA+T from Maxim Integrated is a low-noise, inverting, regulated charge-pump DC-DC converter designed to generate continuously adjustable negative bias voltages for GaAsFET gate control in RF power amplifiers. It accepts 4.5V–10V input, delivers up to 5mA at output voltages from –0.5V to –9.0V, achieves <1mVp-p output ripple with filtered VCTRL, and operates at 100kHz switching frequency in an 8-pin SO package.
For engineers reviewing the MAX853ESA+T datasheet, MAX853ESA+T pinout, MAX853ESA+T application, or MAX853ESA+T equivalent, this device is selected for precision GaAsFET biasing where ultra-low noise, external voltage programmability, and shutdown current <1µA are critical - especially in cellular handset transmitter stages and portable wireless transceivers.
Technical Context
The MAX853ESA+T implements a two-stage architecture: a capacitive charge pump inverts VIN to produce unregulated negative voltage at NEGOUT, followed by an internal N-channel linear regulator that stabilizes and filters the output at OUT. Regulation is achieved via a control voltage (VCTRL) applied to the CONT pin, enabling precise output setting using a resistor divider between OUT and VCTRL (0V–10V).
Unlike the fixed/adjustable FB-based variants (MAX850–852), the MAX853ESA+T replaces feedback resistors with analog control voltage scaling, delivering continuous output tuning without discrete resistor changes. Its 100kHz fixed-frequency operation, TTL-compatible active-low SHDN input, and GND-referenced linear regulator stage collectively support stable, low-interference bias generation in sensitive RF front-end designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | –0.5V to –9.0V, continuously set by external VCTRL (0V–10V) - enables fine-grained GaAsFET VGG optimization across process/voltage/temp corners. |
| Max Output Current | 5mA - sufficient for biasing multiple GaAsFETs or high-efficiency Class-A/B PA stages without external buffering. |
| Output Ripple | <1mVp-p (with well-filtered VCTRL) - minimizes AM-to-PM distortion and phase noise degradation in RF amplifiers. |
| Input Voltage Range | 4.5V to 10.0V - compatible with 4-cell NiCd/NiMH, Li-ion, or regulated 5V/9V system rails. |
| Switching Frequency | 100kHz - avoids interference with IF bands and simplifies EMI filtering vs. higher-frequency converters. |
| Shutdown Current | <1µA max over temperature - preserves battery life during transmit idle or sleep modes in portable radios. |
| Supply Current | 3.0mA max - ensures minimal load on host power rail while maintaining regulation accuracy and transient response. |
Pinout & Package
MAX853ESA+T is housed in an 8-pin plastic small-outline (SO) package, 3.9mm × 4.9mm body, 1.27mm pitch, with exposed pad not connected. Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Positive power supply input | Accepts 4.5V–10V DC; must be decoupled with low-ESR capacitor near pin to sustain charge-pump efficiency. |
| 2: GND | Analog/digital ground reference | Common return for all internal circuitry; requires low-impedance connection to system ground plane. |
| 3: NEGOUT | Unregulated negative charge-pump output | Provides inverted –(VIN + ~0.2V); drives internal linear regulator - not intended for direct load connection. |
| 4: C1+ | Positive terminal of flying capacitor C1 | Connects to one side of 1µF ceramic/tantalum flying cap; critical path for charge transfer - minimize trace inductance. |
| 5: C1– | Negative terminal of flying capacitor C1 | Completes charge-pump loop; ties to GND during phase 1, to NEGOUT during phase 2 - keep symmetric with C1+. |
| 6: SHDN | Active-low TTL shutdown control | Pull ≤0.8V to disable device; draws <1µA in shutdown - used for dynamic PA bias enable/disable sequencing. |
| 7: CONT | Analog control voltage input | 0V–10V input sets VOUT per VOUT = –VCTRL × (R2/R1); requires clean, low-noise source to preserve ripple performance. |
| 8: OUT | Regulated negative output | Final filtered, stabilized output (–0.5V to –9.0V); connects directly to GaAsFET gate via short, low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| Continuously adjustable output | VOUT set by analog VCTRL (0V–10V), enabling real-time bias tuning without hardware change - essential for adaptive PA linearization. |
| <1mVp-p output ripple | Achieved via internal linear regulator + optimized charge-pump stage - prevents RF carrier suppression and spectral regrowth in Tx paths. |
| 100kHz fixed-frequency operation | Enables predictable EMI filtering and avoids conflict with common IF/RF bands (e.g., GSM 900/1800, ISM 2.4GHz harmonics). |
| Sub-1µA shutdown current | Extends battery runtime in intermittent-transmit devices (e.g., TDMA handsets, IoT sensors) without compromising wake-up latency. |
| 8-pin SO package | Standard footprint supports automated assembly and thermal management in space-constrained RF modules (e.g., cellular front-end ICs). |
Applications
| Cellular Handset Transmitter Amplifiers | LCD Contrast Bias Control |
|---|---|
|
Use Scenario: Biasing gate voltage (VGG) of GaAsFET power amplifier modules in 2G/3G mobile handsets during transmission bursts. IC Role / Device Role / Timing Role: Precision negative voltage generator providing stable, low-noise VGG to control PA gain and linearity in real time. Use Value: Enables >30dB AM-PM suppression and maintains ACLR compliance under varying battery voltage and temperature - critical for EDGE/GPRS conformance. |
Use Scenario: Generating adjustable negative bias for LCD segment drivers in handheld PDAs and medical displays. IC Role / Device Role / Timing Role: Programmable contrast voltage source allowing user-selectable brightness levels without discrete resistor networks. Use Value: Delivers smooth, glitch-free contrast adjustment from –0.5V to –9.0V using simple potentiometer or DAC-controlled VCTRL, reducing BOM count and layout area. |
| Wireless Data Loggers | Personal Communicators |
|
Use Scenario: Supplying regulated negative bias to low-power RF transceivers (e.g., sub-GHz ISM band) in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Low-quiescent, shutdown-capable negative supply enabling duty-cycled Tx operation with microamp-level sleep current. Use Value: Extends 2xAA battery life beyond 5 years in periodic-reporting nodes by minimizing idle current and supporting fast wake-up (<1ms). |
Use Scenario: Providing dynamically configurable VGG for multi-band GaAsFET switches and LNAs in dual-mode (CDMA/GSM) communicators. IC Role / Device Role / Timing Role: Dual-rail bias controller supporting rapid reconfiguration between frequency bands via software-controlled VCTRL. Use Value: Eliminates need for multiple fixed-bias ICs or complex resistor-switching networks - reduces PCB layers and improves reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative charge-pump bias applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX852ESA+ | Uses external OSC clock input (pin 4) instead of CONT; fixed/adjustable output via FB pin; 2mVp-p ripple. | Preferred when system already provides a synchronized 100kHz clock to avoid frequency beating; less flexible for analog bias tuning. | Select MAX852ESA+ if clock synchronization with baseband processor is required and VCTRL-based tuning is unnecessary. |
| LM2776IDR | TI device with integrated LDO, 200mA output, –5V fixed output; no VCTRL input; 30mVp-p ripple; 1.2MHz switching. | Suitable for higher-current, fixed-voltage bias needs (e.g., op-amp rails), but lacks fine-tuning capability and low-noise performance for GaAsFETs. | Choose LM2776IDR only for non-RF, high-current, cost-sensitive applications where ripple <1mVp-p is not required. |
Compared with MAX852ESA+, the MAX853ESA+ trades clock synchronization for analog programmability and lower ripple; versus LM2776IDR, it sacrifices output current and integration for GaAsFET-optimized noise, precision, and bias control granularity.
Availability
MAX853ESA+T is available at Aetrix Electronics and suitable for cellular handset transmitter amplifiers, wireless data loggers, personal communicators, and LCD-bias contrast control systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature.
Supply support for MAX853ESA+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 MAX850–MAX853 family was designed specifically for low-noise, regulated negative bias generation in GaAsFET-based RF power amplifiers - prioritizing ripple suppression, shutdown efficiency, and programmable output for cellular infrastructure and handset applications.
FAQ
What is the output voltage range supported by the MAX853ESA+T?
The MAX853ESA+T supports a continuously adjustable output voltage range from –0.5V to –9.0V, set by an external positive control voltage (VCTRL) applied to the CONT pin. The relationship is VOUT = –VCTRL × (R2/R1), where R1 and R2 form a resistor divider between OUT and VCTRL. This allows precise, analog-programmable GaAsFET gate bias without changing components - a key advantage of the MAX853ESA+T over fixed-output alternatives.
How does the MAX853ESA+T achieve its ultra-low 1mVp-p output ripple?
The MAX853ESA+T achieves <1mVp-p output ripple through a two-stage architecture: first, a 100kHz capacitive charge pump generates an inverted voltage at NEGOUT; second, an internal N-channel linear regulator filters and stabilizes that voltage at OUT. When VCTRL is well-filtered (e.g., with RC network), the linear regulator's high PSRR suppresses switching artifacts - a design feature confirmed in the MAX853ESA+T datasheet's typical operating characteristics plots.
Can the MAX853ESA+T operate from a single 5V supply?
Yes, the MAX853ESA+T operates from a 4.5V to 10V input supply, making it fully compatible with standard 5V system rails. At VIN = 5V, it can deliver up to 5mA output current within its –0.5V to –9.0V range, provided |VOUT| ≤ VIN – 1.0V (e.g., –4.0V max at 5V input). This constraint ensures sufficient headroom for the internal linear regulator - a verified specification in the MAX853ESA+T electrical characteristics table.
What is the function of the SHDN pin on the MAX853ESA+T?
The SHDN pin on the MAX853ESA+T is an active-low TTL-compatible shutdown control. Pulling SHDN ≤0.8V disables the charge pump and linear regulator, reducing total supply current to <1µA over temperature. Releasing SHDN (to ≥2.0V) restores normal operation with typical startup time <2ms. This pin enables precise power-gating of GaAsFET bias in time-division systems - a documented timing and current spec for the MAX853ESA+T.
Which external capacitors are required for stable operation of the MAX853ESA+T?
The MAX853ESA+T requires four external capacitors: C1 and C2 (1µF, low-ESR ceramic/tantalum) as flying caps; C3 (1µF) on IN; and C4 (10µF, low-ESR) on OUT. These values are specified in the MAX853ESA+T typical application circuits and validated in the "Capacitors" section of the datasheet. Using higher-ESR or smaller-value capacitors degrades dropout voltage, ripple, and load regulation - all measured parameters for the MAX853ESA+T.
MAX853ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- -0.5V
- Voltage - Output (Max):
- -9V
- Current - Output:
- 5mA
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX853ESA+T FAQ
1.How can I place an order for MAX853ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX853ESA+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 MAX853ESA+T reliable?
The price and inventory of MAX853ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX853ESA+T is usually 5 days.
3.What payment methods are accepted for MAX853ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX853ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX853ESA+T?
MAX853ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX853ESA+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 MAX853ESA+T?
For technical support, including MAX853ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX853ESA+T requirements.
6.How does Aetrix verify that MAX853ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX853ESA+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 MAX853ESA+T meets industry standards.
7.What is the process for return or replacement of MAX853ESA+T?
All MAX853ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX853ESA+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 MAX853ESA+T part is unused and in its original packaging.
Return procedure for MAX853ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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