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Analog Devices Inc./Maxim Integrated MAX1820YEBC-T
- Part No.:
- MAX1820YEBC-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 10-WFBGA, CSPBGA
- Datasheet:
-
MAX1820YEBC-T.pdf
- Description:
- IC REG LINEAR WCDMA 600MA BUCK
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX1820YEBC-T from Maxim Integrated is a 19.8MHz-synchronizable, dynamically adjustable 600mA PWM buck regulator optimized for WCDMA power amplifier supply, featuring 0.4V–3.4V output voltage range, <30µs output settling time, 150mV dropout at 600mA, and 180µA quiescent current in skip mode.
For engineers reviewing the MAX1820YEBC-T datasheet, MAX1820YEBC-T pinout, MAX1820YEBC-T application, or MAX1820YEBC-T equivalent, this page delivers verified electrical parameters, UCSP package details, synchronous rectification architecture, dynamic VOUT control interface, and validated alternatives for RF power management design.
Technical Context
The MAX1820YEBC-T implements a slope-compensated current-mode PWM controller with 100% duty-cycle capability and internal P-channel/N-channel MOSFETs. It supports external 19.8MHz AC-coupled sine-wave synchronization via the SYNC pin, dividing by 18:1 to achieve precise 1.1MHz switching-critical for avoiding interference in WCDMA IF bands.
Its dynamic output control uses an analog REF input (0.227V–1.932V) with 1.76× gain to set VOUT from 0.4V to 3.4V; the OUT pin senses output directly for fast transient response (<30µs full-scale step), while COMP provides error amplifier compensation with 0.45V–2.15V clamp range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600mA guaranteed - supports linear PA biasing under peak WCDMA envelope conditions. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li+ battery operation across discharge profile. |
| Output Voltage Range | 0.4V to 3.4V (dynamically adjustable) - enables real-time PA efficiency optimization across transmit power levels. |
| Dropout Voltage | 150mV at 600mA load - includes RDS(on) + external inductor DCR, enabling low-VIN operation near battery end-of-life. |
| Quiescent Current | 180µA typical in skip mode - extends standby battery life in mobile handsets. |
| Switching Frequency | 1.1MHz (sync'd to 19.8MHz input) - allows use of compact 4.7µH inductors and reduces EMI fundamental below critical RF bands. |
| Shutdown Current | 0.1µA typical - ensures zero-load leakage during system sleep states. |
Pinout & Package
MAX1820YEBC-T is housed in a 3 × 4 mm chip-scale package (UCSP™), pin-compatible with other MAX1820 variants in the same footprint. The UCSP uses a 10-terminal configuration with solder bumps on bottom side; thermal performance relies on proper PCB pad layout per Maxim's UCSP Reliability Notice.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SKIP | PWM/Skip-Mode Control Input | Logic-low enables automatic PWM/pulse-skipping; logic-high forces constant-frequency PWM for noise-sensitive RF sections. |
| COMP | Error Amplifier Compensation Node | Connect 43kΩ resistor + 330pF capacitor to GND to stabilize loop; clamp range 0.45V–2.15V prevents saturation. |
| OUT | Direct Output Voltage Sense | Connected directly to VOUT node; enables fast regulation without feedback divider, supporting <30µs transient settling. |
| REF | Analog Reference Input | Accepts 0.227V–1.932V DAC signal; 1.76× gain sets VOUT = 0.4V–3.4V dynamically for PA envelope tracking. |
| GND | Analog Ground | Reference for internal circuitry; must be separated from PGND in layout to minimize noise coupling. |
| PGND | Power Ground | Return path for high-current LX switching; requires low-inductance connection to input/output capacitors. |
| LX | Switch Node | Drain connection of internal P-channel and N-channel MOSFETs; drives external inductor; high-impedance in shutdown. |
| BATT | Main Supply Input | 2.6V–5.5V input; bypassed to PGND with 10µF low-ESR capacitor to suppress ripple and support peak current delivery. |
| SHDN | Active-Low Shutdown Control | Pulls internal reference, oscillator, and switches offline; reduces supply current to 0.1µA. |
| SYNC | External Clock Synchronization Input | AC-coupled 19.8MHz sine wave (500mVP-P) synchronizes switching at 1.1MHz; must be grounded if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamically adjustable output (0.4V–3.4V) | Enables real-time PA bias optimization via analog REF input, improving average system efficiency over WCDMA transmit envelope. |
| 19.8MHz sync input with 18:1 divider | Locks switching frequency to system clock domain, eliminating beat frequencies and simplifying EMI filtering in cellular RF front-end. |
| Synchronous rectification | Eliminates need for external Schottky diode, reducing BOM count and conduction losses - especially critical at light loads and low VOUT. |
| 100% duty-cycle operation | Maintains regulation down to VIN = VOUT + 150mV, extending usable battery range in portable devices. |
| Sub-30µs output settling time | Supports rapid PA voltage transitions required by WCDMA closed-loop power control without output overshoot or instability. |
Applications
| WCDMA Power Amplifier Supply | Portable RF Transmitter Bias |
|---|---|
Use Scenario: Supplies variable-voltage bias to linear power amplifier in WCDMA handset during dynamic transmit power control. IC Role / Device Role / Timing Role: Dynamically regulated buck converter delivering 0.4V–3.4V at up to 600mA with <30µs settling to track PA envelope. Use Value: Improves PA efficiency across full transmit power range, reducing heat generation and extending talk time. | Use Scenario: Provides clean, low-noise, synchronized DC bias to RF power stages in handheld test equipment and IoT transceivers. IC Role / Device Role / Timing Role: 1.1MHz synchronized buck regulator minimizing spectral interference with sensitive IF receivers and ADC sampling clocks. Use Value: Enables coexistence of high-efficiency power conversion and precision RF/analog functions on shared PCB. |
| Low-Voltage Microprocessor Core Supply | Digital Camera Flash LED Driver Support |
Use Scenario: Powers low-voltage core logic (e.g., ARM Cortex-M series) in battery-operated embedded controllers requiring fast load transient response. IC Role / Device Role / Timing Role: Fast-settling buck regulator with direct output sensing and 100% duty-cycle dropout recovery for stable core voltage during burst processing. Use Value: Prevents core brownout during CPU wake-up spikes, ensuring deterministic real-time execution. | Use Scenario: Supplies auxiliary bias to flash LED driver ICs during camera capture sequences where battery voltage sags under pulse load. IC Role / Device Role / Timing Role: Low-dropout (150mV @ 600mA), high-efficiency buck regulator maintaining regulated VOUT as Li+ cell discharges from 4.2V to 3.0V. Use Value: Guarantees consistent flash brightness and color temperature across full battery cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1820ZEBC-T | No SYNC capability; uses internal 1MHz oscillator only. | Suitable for non-synchronized, cost-sensitive designs where EMI spectrum control is less critical. | Select when 19.8MHz sync is unnecessary and fixed 1MHz operation suffices. |
| MAX1820XEBC-T | Synchronizes to 13MHz external clock (13:1 division), yielding 1MHz switching. | Better suited for systems with 13MHz crystal references (e.g., GPS modules, baseband processors). | Choose when existing 13MHz system clock is available and 1MHz sync alignment is preferred. |
Compared with MAX1820YEBC-T, MAX1820ZEBC-T lacks synchronization entirely and offers no RF-band EMI control, while MAX1820XEBC-T aligns to 13MHz sources instead of 19.8MHz - making MAX1820YEBC-T uniquely matched to WCDMA baseband timing architectures requiring 1.1MHz switching.
Availability
MAX1820YEBC-T is available at Aetrix Electronics and suitable for WCDMA handset power amplifiers, portable RF transmitter biasing, and low-voltage microprocessor core supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX1820YEBC-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 power management ICs for demanding industrial, communications, and consumer applications.
The MAX1820 product line targets high-efficiency, dynamically controlled DC-DC conversion in battery-powered RF systems-specifically engineered for WCDMA PA supply with sub-30µs voltage agility and synchronized switching.
FAQ
What is the exact switching frequency of MAX1820YEBC-T when synchronized?
The MAX1820YEBC-T divides a 19.8MHz AC-coupled sine-wave input by 18:1, resulting in a precise 1.1MHz switching frequency. This ratio is hard-coded in silicon and guarantees stable synchronization without jitter accumulation, making it ideal for WCDMA systems where switching harmonics must avoid critical IF bands.
How does MAX1820YEBC-T achieve <30µs output voltage settling time?
The MAX1820YEBC-T achieves <30µs full-scale output settling via direct OUT pin sensing (no feedback divider), high-transconductance error amplifier (30–85µS), and optimized internal compensation. This architecture minimizes phase lag and enables rapid correction of large VOUT steps-essential for dynamic PA biasing in WCDMA closed-loop power control.
Can MAX1820YEBC-T operate with input voltage below 2.6V?
No. The MAX1820YEBC-T has an undervoltage lockout (UVLO) threshold of 2.35V (typical), but guaranteed operation begins only at 2.6V per datasheet specifications. Below 2.6V, output regulation is not assured, and the device may enter dropout or disable entirely-designs must ensure BATT remains ≥2.6V during active operation.
What is the role of the REF pin on MAX1820YEBC-T?
The REF pin on MAX1820YEBC-T accepts an analog control voltage (0.227V–1.932V) that is amplified by 1.76× internally to set the output voltage from 0.4V to 3.4V. It enables true dynamic adjustment-e.g., driven by a DAC or baseband processor-making MAX1820YEBC-T suitable for envelope-tracking PA supply in WCDMA handsets.
Is external compensation required for MAX1820YEBC-T stability?
Yes. The MAX1820YEBC-T requires external compensation on the COMP pin: a 43kΩ resistor in series with a 330pF capacitor to GND. This network sets the dominant pole and phase margin for the current-mode control loop; omitting it risks oscillation or poor transient response, especially with ceramic output capacitors.
MAX1820YEBC-T 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)
MAX1820YEBC-T FAQ
1.How can I place an order for MAX1820YEBC-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1820YEBC-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 MAX1820YEBC-T reliable?
The price and inventory of MAX1820YEBC-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1820YEBC-T is usually 5 days.
3.What payment methods are accepted for MAX1820YEBC-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1820YEBC-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1820YEBC-T?
MAX1820YEBC-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1820YEBC-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 MAX1820YEBC-T?
For technical support, including MAX1820YEBC-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1820YEBC-T requirements.
6.How does Aetrix verify that MAX1820YEBC-T is sourced from the original manufacturer or authorized distributors?
All MAX1820YEBC-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 MAX1820YEBC-T meets industry standards.
7.What is the process for return or replacement of MAX1820YEBC-T?
All MAX1820YEBC-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1820YEBC-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 MAX1820YEBC-T part is unused and in its original packaging.
Return procedure for MAX1820YEBC-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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