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Analog Devices Inc./Maxim Integrated MAX1820ZEBC
- Part No.:
- MAX1820ZEBC
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 10-WFBGA, CSPBGA
- Datasheet:
-
MAX1820ZEBC.pdf
- Description:
- IC REG LINEAR WCDMA 600MA BUCK
- Quantity:
- Payment:
- Shipping:
Inventory:3,023
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Product details
Overview
MAX1820ZEBC 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 input voltage range 2.6V–5.5V, internal 1MHz oscillator (no SYNC), and dynamically adjustable output from 0.4V to 3.4V via analog REF input. Its <30µs output voltage settling time enables rapid PA bias modulation in cellular handset transmit chains.
For engineers reviewing the MAX1820ZEBC datasheet, MAX1820ZEBC pinout, MAX1820ZEBC application, or MAX1820ZEBC equivalent, key selection criteria include its UCSP package footprint, 150mV dropout at 600mA, skip-mode quiescent current of 180µA, and compatibility with dynamic VOUT control in battery-constrained RF power stages.
Technical Context
The MAX1820ZEBC implements a slope-compensated current-mode PWM controller with 100% duty-cycle capability, enabling operation down to 150mV dropout. Its internal P-channel high-side switch (0.3Ω typ) and N-channel synchronous rectifier eliminate external Schottky diodes and support continuous/discontinuous conduction modes.
It features dual operating modes: normal mode (SKIP = GND) enables automatic PWM-to-skip transition at light loads, while forced PWM (SKIP = BATT) maintains constant 1MHz switching for EMI-sensitive RF sections. The REF-to-OUT gain is fixed at 1.76, and output regulation uses an internal 1.932V reference with ±0.005V tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600mA guaranteed - supports full-power WCDMA PA operation without thermal derating in UCSP package. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single Li+ battery (3.0V–4.2V) and regulated 3.3V/5V rails. |
| Output Voltage Range | 0.4V to 3.4V (dynamically adjustable) - matches linear PA VCC requirements across modulation states. |
| Switching Frequency | 1MHz (internal oscillator) - enables use of small 4.7µH inductors and 4.7µF ceramic output capacitors. |
| Quiescent Current | 180µA (typ) in skip mode - extends battery life during standby/idle PA states. |
| Dropout Voltage | 150mV at 600mA load - includes RDS(ON) + external inductor DCR, enabling high-efficiency low-VIN operation. |
| Shutdown Current | 0.1µA (typ) - ensures near-zero leakage when PA is disabled. |
Pinout & Package
The MAX1820ZEBC is housed in a 3 × 4 mm chip-scale package (UCSP™), offering minimal PCB area and low thermal resistance for portable RF applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SKIP | PWM/Skip-mode control input | Logic-low (GND) enables automatic skip mode at light loads; logic-high (BATT) forces constant-frequency PWM. |
| COMP | Compensation node | Connects to RC network (43kΩ + 330pF to GND) to stabilize loop response for dynamic VOUT transitions. |
| OUT | Output voltage sense input | Direct connection to VOUT provides feedback for fast transient response and accurate regulation. |
| REF | Analog reference input | Accepts DAC output; 1.76× gain sets VOUT = 0.4V–3.4V; settling time <30µs supports WCDMA envelope tracking. |
| GND | Analog ground | Reference for error amplifier and internal bias; must be star-connected to minimize noise coupling. |
| PGND | Power ground | Return path for LX switch current; separate from GND to avoid switching noise injection into control circuitry. |
| LX | Switch node | Drain connection of internal P-channel MOSFET and N-channel synchronous rectifier; drives external inductor. |
| BATT | Input supply | 2.6V–5.5V input; requires 10µF low-ESR capacitor to PGND for stable high-frequency operation. |
| SHDN | Active-low shutdown | Pulls device into 0.1µA shutdown state; output goes high-impedance, preserving system isolation. |
| SYNC | Sync clock input | Must be tied to GND (no synchronization capability); unused in MAX1820ZEBC variant. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamically adjustable output | VOUT set via analog REF input (0.227V–1.932V) with 1.76× gain, enabling real-time PA bias control without digital interface overhead. |
| 100% duty-cycle operation | Supports dropout as low as 150mV at 600mA, maintaining regulation even as Li+ battery discharges below 3.0V. |
| No external Schottky diode required | Integrated N-channel synchronous rectifier improves efficiency by >5% vs. diode-based solutions and reduces component count. |
| Fast output settling | <30µs full-scale VOUT transition - meets WCDMA envelope tracking timing requirements for adjacent-channel leakage ratio (ACLR) compliance. |
| Low-light-load quiescent current | 180µA typical in skip mode - minimizes idle current in burst-mode transmission scenarios. |
Applications
| WCDMA Power Amplifier Bias | Portable RF Transmitter Supply |
|---|---|
|
Use Scenario: Dynamic biasing of linear power amplifiers in 3G handsets during varying modulation envelopes. IC Role / Device Role / Timing Role: Primary VCC regulator delivering rapidly modulated output voltage synchronized to baseband envelope signal via REF pin. Use Value: Enables >90% PA efficiency across back-off range while meeting ACLR and spectral mask requirements. |
Use Scenario: Compact, high-efficiency supply for RF front-end ICs in handheld test equipment and IoT transceivers. IC Role / Device Role / Timing Role: Step-down converter providing clean, low-noise 1.8V–3.3V rail with sub-30µs transient recovery for sensitive RF synthesizers. Use Value: Eliminates need for external diode and reduces solution size by 40% vs. legacy buck designs. |
| Microprocessor Core Supply | Digital Camera Image Sensor Bias |
|
Use Scenario: Low-voltage core supply for ARM Cortex-M microcontrollers in battery-powered edge nodes. IC Role / Device Role / Timing Role: Adjustable buck regulator delivering 0.9V–1.3V at up to 600mA with fast load-step response. Use Value: Supports dynamic voltage scaling (DVS) to reduce active power by 35% during low-compute intervals. |
Use Scenario: Precision analog bias for CMOS image sensor pixel arrays requiring low-noise, stable VDD. IC Role / Device Role / Timing Role: Low-ripple DC-DC source with 150mV dropout and 180µA quiescent current for always-on imaging subsystems. Use Value: Reduces dark current and fixed-pattern noise by minimizing supply-induced thermal drift and ripple. |
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 version using external FB resistors; no REF input; 1.25V–5.5V programmable range; same UCSP/µMAX packages. | Suitable for non-dynamic, stable-core supplies (e.g., MCU I/O rails), not envelope-tracking PA bias. | Select MAX1821EUB when output voltage is static and feedback resistor tuning is acceptable. |
| TPS62231DRVR | TI 600mA buck with 2.05V–6.0V input, 0.6V–5.5V output, 3.6MHz switching, but no analog REF control or sub-30µs settling. | Better suited for general-purpose portable logic rails where high-frequency switching reduces inductor size, not RF PA bias. | Choose TPS62231DRVR only if higher switching frequency and smaller passive components outweigh dynamic control needs. |
Compared with MAX1821EUB and TPS62231DRVR, the MAX1820ZEBC uniquely supports analog-dynamic VOUT control with <30µs settling-critical for WCDMA PA efficiency-while maintaining ultra-low quiescent current and 150mV dropout in a 3×4mm UCSP package.
Availability
MAX1820ZEBC is available at Aetrix Electronics and suitable for WCDMA handset design, portable RF transmitter development, and battery-powered microprocessor core supply applications requiring stable component supply and long-term lifecycle support.
Supply support for MAX1820ZEBC 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 industrial, communications, and consumer applications.
The MAX1820/MAX1821 product line was designed specifically for high-efficiency, dynamically controlled power delivery to RF power amplifiers in cellular handsets, emphasizing fast transient response, low dropout, and minimal external component count.
FAQ
What is the function of the REF pin on the MAX1820ZEBC?
The REF pin on the MAX1820ZEBC accepts an analog control voltage (0.227V–1.932V) that is amplified by a fixed 1.76× gain to set the output voltage between 0.4V and 3.4V. This enables direct envelope-tracking bias for WCDMA power amplifiers without digital interface overhead. The MAX1820ZEBC achieves <30µs full-scale VOUT settling time from REF changes, making it suitable for real-time PA efficiency optimization.
Does the MAX1820ZEBC support external clock synchronization?
No, the MAX1820ZEBC does not support external clock synchronization. Its SYNC pin must be connected to GND to enable the internal free-running 1MHz oscillator. Synchronization capability is exclusive to the MAX1820XEBC (13MHz) and MAX1820YEBC (19.8MHz) variants. Using SYNC incorrectly (e.g., leaving it floating or applying voltage) may cause unstable operation or failure to regulate in the MAX1820ZEBC.
What is the maximum guaranteed output current for the MAX1820ZEBC?
The MAX1820ZEBC guarantees 600mA output current across the full operating temperature range (–40°C to +85°C) and input voltage range (2.6V to 5.5V). This rating is validated under worst-case conditions including 150mV dropout (including external inductor DCR) and thermal limits of the 3×4mm UCSP package. Derating is not required for typical WCDMA PA peak-current profiles.
How does skip mode reduce quiescent current in the MAX1820ZEBC?
In skip mode (SKIP = GND), the MAX1820ZEBC disables switching when the output voltage remains within regulation, reducing average supply current to 180µA (typ). During light loads (<65mA), pulses are skipped entirely until output droop triggers a new switching cycle. This eliminates switching losses in the internal MOSFETs and external inductor, significantly extending battery life in standby or low-duty-cycle RF transmission modes.
What package type is used for the MAX1820ZEBC?
The MAX1820ZEBC uses a 3 × 4 mm chip-scale package (UCSP™), designated in the ordering code as "EBC". This ultra-compact, near-chip-die footprint minimizes PCB area and thermal resistance-critical for space-constrained mobile handset designs. The UCSP marking "AAB" identifies this specific MAX1820Z variant, and assembly requires adherence to Maxim's UCSP reliability guidelines for solder profile and board material selection.
MAX1820ZEBC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFBGA, CSPBGA
- 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:
- 12-UCSP (2.02x1.54)
MAX1820ZEBC FAQ
1.How can I place an order for MAX1820ZEBC through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1820ZEBC 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 MAX1820ZEBC reliable?
The price and inventory of MAX1820ZEBC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1820ZEBC is usually 5 days.
3.What payment methods are accepted for MAX1820ZEBC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1820ZEBC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1820ZEBC?
MAX1820ZEBC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1820ZEBC 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 MAX1820ZEBC?
For technical support, including MAX1820ZEBC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1820ZEBC requirements.
6.How does Aetrix verify that MAX1820ZEBC is sourced from the original manufacturer or authorized distributors?
All MAX1820ZEBC 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 MAX1820ZEBC meets industry standards.
7.What is the process for return or replacement of MAX1820ZEBC?
All MAX1820ZEBC units undergo pre-shipment inspection (PSI). If there is an issue with MAX1820ZEBC, 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 MAX1820ZEBC part is unused and in its original packaging.
Return procedure for MAX1820ZEBC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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