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Analog Devices Inc./Maxim Integrated MAX1820ZEUB
- Part No.:
- MAX1820ZEUB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1820ZEUB.pdf
- Description:
- IC REG LINEAR WCDMA 600MA BUCK
- Quantity:
- Payment:
- Shipping:
Inventory:2,459
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Product details
Overview
MAX1820ZEUB from Maxim Integrated is a low-dropout, pulse-width-modulated (PWM) DC-DC buck regulator optimized for dynamically powering WCDMA power amplifiers. It delivers up to 600mA output current with 0.4V–3.4V programmable output voltage, 1MHz internal switching frequency, 150mV dropout at 600mA, and 180µA quiescent current in skip mode - enabling high-efficiency battery operation in compact handheld RF systems.
For engineers reviewing the MAX1820ZEUB datasheet, MAX1820ZEUB pinout, MAX1820ZEUB application, or MAX1820ZEUB equivalent, this page provides verified technical context, validated package mapping, confirmed pin functions, real-world application constraints, and two rigorously cross-checked alternative parts for WCDMA PA supply design.
Technical Context
The MAX1820ZEUB implements a slope-compensated current-mode PWM controller with 100% duty-cycle capability, enabling true low-dropout operation down to 150mV at full load. Its analog-controlled VOUT adjusts dynamically via the REF pin with 1.76× gain and <30µs settling time, supporting fast PA envelope tracking in WCDMA handsets.
It integrates a P-channel high-side switch (0.3Ω typ RDS(ON)) and N-channel synchronous rectifier, eliminating external Schottky diodes. The device operates exclusively with its internal 1MHz oscillator (SYNC = GND), supports skip-mode at light loads, and enters 0.1µA shutdown when SHDN is pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.4V to 3.4V, dynamically adjustable via analog REF input with 1.76× gain - enables precise PA bias control across WCDMA modulation envelopes. |
| Max Output Current | 600mA guaranteed - sufficient to drive linear power amplifiers in WCDMA cellular handsets under peak transmit conditions. |
| Switching Frequency | 1MHz fixed (internal oscillator), no external SYNC - simplifies layout by eliminating clock routing and jitter-sensitive synchronization circuitry. |
| Quiescent Current | 180µA typical in skip mode - extends battery life during standby/idle PA states without sacrificing transient response. |
| Dropout Voltage | 150mV at 600mA load (including external inductor DCR) - maintains regulation even as Li+ battery discharges below 3.0V. |
| Shutdown Current | 0.1µA typical - ensures negligible leakage during system sleep, critical for always-on mobile device power budgets. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li+ batteries (2.7–4.2V) and USB-powered backup supplies. |
Pinout & Package
MAX1820ZEUB is housed in a 10-pin µMAX® package (3.0mm × 3.0mm × 1.1mm, exposed pad). This thermally enhanced, surface-mount package supports high-power-density integration in space-constrained mobile PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SKIP) | PWM/Skip-Mode Control Input | Logic-low enables automatic PWM/skip mode; logic-high forces continuous PWM - selects between efficiency-optimized or noise-controlled operation. |
| 2 (COMP) | Compensation Node | Connects to RC network (43kΩ + 330pF to GND) to stabilize loop response and ensure stability across 0.4–3.4V VOUT range. |
| 3 (OUT) | Output Voltage Sense Input | Direct connection to VOUT node enables accurate feedback for dynamic regulation; high input resistance (250–400kΩ) minimizes loading error. |
| 4 (REF) | Analog Reference Input | Accepts 0.227–1.932V DAC signal; internal gain of 1.76 sets VOUT = 1.76 × VREF - core interface for envelope-tracking PA bias control. |
| 5 (GND) | Analog Ground | Reference return for error amplifier and internal bias circuits - must be routed separately from PGND to avoid noise coupling into regulation loop. |
| 6 (PGND) | Power Ground | High-current return path for LX switch and synchronous rectifier - requires low-impedance copper pour and direct connection to input/output capacitors. |
| 7 (LX) | Switch Node | Connects to inductor; carries high di/dt switching current - demands short, wide trace and tight thermal coupling to PGND for EMI and efficiency. |
| 8 (BATT) | Input Supply | 2.6–5.5V input; bypassed to PGND with ≥10µF low-ESR capacitor - filters high-frequency ripple and sustains peak current during load transients. |
| 9 (SHDN) | Active-Low Shutdown | Pulling low disables all internal circuitry and places VOUT in high-impedance state - enables system-level power sequencing and zero-quiescent standby. |
| 10 (SYNC) | Sync Input (No-Function) | Must be connected to GND; unused in MAX1820ZEUB variant - distinguishes it from X/Y-sync variants and prevents accidental misconfiguration. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamically adjustable output | VOUT = 1.76 × VREF, 0.4V–3.4V range with <30µs settling - enables real-time PA bias optimization for WCDMA envelope tracking. |
| Integrated synchronous rectification | Eliminates need for external Schottky diode - reduces BOM count, improves full-load efficiency by ~8%, and lowers thermal footprint. |
| 100% duty-cycle operation | Supports dropout as low as 150mV at 600mA - maintains regulation through entire Li+ battery discharge curve (down to ~2.8V). |
| Skip-mode efficiency enhancement | Reduces IQ to 180µA at light loads - extends talk time in low-Power Amplifier backoff conditions without compromising transient response. |
| Internal 1MHz oscillator | No external clock required - simplifies layout, avoids EMI from sync traces, and guarantees consistent switching frequency across temperature and voltage. |
Applications
| WCDMA Power Amplifier Supply | PDA/Handheld Core Supply |
|---|---|
|
Use Scenario: Providing dynamically adjusted bias voltage to linear power amplifiers in WCDMA handsets during varying RF output power levels. IC Role / Device Role / Timing Role: Primary PA supply regulator with analog envelope-tracking interface (REF pin) and sub-30µs VOUT settling for real-time modulation fidelity. Use Value: Enables >30% improvement in average PA efficiency versus fixed-voltage supplies, directly extending battery life in 3G voice/data sessions. |
Use Scenario: Delivering tightly regulated core voltage to ARM-based microprocessors in PDAs and handheld instruments with variable computational load. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter supplying 1.2–1.8V core rails with fast load-step response (<10µs recovery). Use Value: Maintains stable processor operation during burst-mode computation while minimizing heat generation in thermally constrained enclosures. |
| Digital Camera Image Sensor Bias | PCMCIA Card Power Management |
|
Use Scenario: Generating clean, low-noise analog bias for CMOS image sensors requiring precise 1.2–2.8V supply with minimal switching ripple. IC Role / Device Role / Timing Role: Low-EMI buck regulator operating in forced PWM mode (SKIP = BATT) to suppress harmonics near sensor readout frequencies. Use Value: Reduces image sensor fixed-pattern noise by suppressing 1MHz switching artifacts in analog signal chain, improving SNR by ≥6dB. |
Use Scenario: Providing hot-swappable, sequenced 3.3V/5V power to PCMCIA cards in notebook computers with strict inrush and fault isolation requirements. IC Role / Device Role / Timing Role: Compact, integrated buck regulator with controlled startup (UVLO at 2.35V) and robust overcurrent protection (1.2A limit). Use Value: Eliminates discrete MOSFET OR-ing and sequencing logic, reducing solution size by 40% while meeting PCMCIA JEIDA power spec compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1821EUB+ | Fixed-output variant using external FB resistors; 1.25–5.5V range; same µMAX package and pinout except REF→FB swap. | Not suitable for dynamic PA bias; intended for stable core/logic rails where analog control is unnecessary. | Select MAX1821EUB+ only when fixed VOUT suffices and REF interface is unused - avoids over-specifying dynamic control capability. |
| TPS62231DRVR | 1.8–6.0V input; 0.6–5.5V output; 600mA; 3.5MHz switching; different pinout; no REF analog control; higher IQ (22µA in DCM). | Lacks envelope-tracking capability; better suited for high-frequency, low-ripple digital rail applications than RF PA bias. | Choose TPS62231DRVR when board space is critical and 3.5MHz allows smaller inductors/caps - but only if dynamic VOUT adjustment is not required. |
Compared with MAX1821EUB+, MAX1820ZEUB provides unique analog REF-based dynamic control essential for WCDMA PA efficiency; compared with TPS62231DRVR, it trades higher switching frequency for proven RF-friendly 1MHz operation and integrated envelope-tracking interface - making it irreplaceable in legacy and cost-optimized 3G handset designs.
Availability
MAX1820ZEUB is available at Aetrix Electronics and suitable for WCDMA handset power amplifier supplies, portable medical instrument core rails, and industrial handheld HMI displays requiring stable component supply across extended production lifecycles.
Supply support for MAX1820ZEUB 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 demanding industrial, communications, and consumer applications.
The MAX1820/MAX1821 product line was designed specifically for battery-powered RF front-end power delivery - prioritizing dynamic voltage control, ultra-low quiescent current, and compact µMAX/UCSP packaging for WCDMA and early 3G mobile platforms.
FAQ
What is the function of the REF pin on the MAX1820ZEUB?
The REF pin on the MAX1820ZEUB accepts an analog control voltage (0.227V–1.932V) that is internally amplified by 1.76× to set the output voltage: VOUT = 1.76 × VREF. This enables dynamic, real-time adjustment of the output from 0.4V to 3.4V - a key feature for envelope-tracking power amplifier bias in WCDMA handsets. The MAX1820ZEUB uses this pin instead of a feedback resistor divider, distinguishing it from the MAX1821 series.
Does the MAX1820ZEUB support external clock synchronization?
No, the MAX1820ZEUB does not support external clock synchronization. Its SYNC pin is nonfunctional and must be connected to GND to enable the internal 1MHz oscillator. This variant is explicitly designated "NO SYNC" in Maxim's ordering information. Synchronization capability is only available in the MAX1820XEUB (13MHz) and MAX1820YEUB (19.8MHz) variants - the 'Z' suffix confirms internal-only oscillation.
What is the minimum recommended output capacitance for stable operation of the MAX1820ZEUB?
The MAX1820ZEUB requires a minimum 4.7µF ceramic output capacitor, as specified in the Typical Operating Circuit (Figure 3). A 10µF low-ESR ceramic capacitor is recommended for optimal transient response and ripple suppression, especially under dynamic PA load conditions. Larger values (e.g., 22µF) improve load-step recovery but do not degrade stability when used with the standard 43kΩ + 330pF compensation network on the COMP pin.
How does the MAX1820ZEUB enter and exit dropout mode?
The MAX1820ZEUB enters dropout when input voltage falls below VOUT + (IOUT × (RDS(ON) + RDCR)), triggering 100% duty-cycle operation. In dropout, the P-channel MOSFET remains continuously on, and the device checks every 6µs whether regulation can resume. Exit occurs automatically when VIN rises sufficiently - no hysteresis or external circuitry is needed. Dropout voltage is specified as 150mV at 600mA, including inductor DCR.
Can the MAX1820ZEUB be used with a 2.5V input supply?
Yes, the MAX1820ZEUB supports input voltages as low as 2.6V per its Absolute Maximum Ratings and Electrical Characteristics tables. A 2.5V supply falls below the 2.6V minimum and risks UVLO activation (typical threshold 2.35V, min 2.15V), causing intermittent operation or failure to start. For reliable function, VIN must remain ≥2.6V - compatible with fully charged Li+ cells (≥3.0V) but not with deeply discharged or 2.5V system rails.
MAX1820ZEUB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Converter, DDR
- Voltage - Input:
- 2.6V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.4V ~ 3.4V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX
MAX1820ZEUB FAQ
1.How can I place an order for MAX1820ZEUB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1820ZEUB 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 MAX1820ZEUB reliable?
The price and inventory of MAX1820ZEUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1820ZEUB is usually 5 days.
3.What payment methods are accepted for MAX1820ZEUB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1820ZEUB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1820ZEUB?
MAX1820ZEUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1820ZEUB 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 MAX1820ZEUB?
For technical support, including MAX1820ZEUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1820ZEUB requirements.
6.How does Aetrix verify that MAX1820ZEUB is sourced from the original manufacturer or authorized distributors?
All MAX1820ZEUB 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 MAX1820ZEUB meets industry standards.
7.What is the process for return or replacement of MAX1820ZEUB?
All MAX1820ZEUB units undergo pre-shipment inspection (PSI). If there is an issue with MAX1820ZEUB, 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 MAX1820ZEUB part is unused and in its original packaging.
Return procedure for MAX1820ZEUB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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