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Analog Devices Inc./Maxim Integrated MAX1820ZEBC+T
- Part No.:
- MAX1820ZEBC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 10-WFBGA, CSPBGA
- Datasheet:
-
MAX1820ZEBC+T.pdf
- Description:
- IC REG LINEAR WCDMA 600MA BUCK
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX1820ZEBC+T from Maxim Integrated is a low-dropout, pulse-width-modulated (PWM) DC-DC buck regulator optimized for dynamically powering WCDMA power amplifiers. It delivers 600mA output current with 0.4V–3.4V programmable output voltage, 1MHz switching frequency, and 150mV dropout at full load - enabling compact, high-efficiency battery-powered RF front-end designs.
For engineers reviewing the MAX1820ZEBC+T datasheet, MAX1820ZEBC+T pinout, MAX1820ZEBC+T application, or MAX1820ZEBC+T equivalent, key selection criteria include dynamic voltage control bandwidth (<30µs settling), skip-mode quiescent current (180µA), internal 1MHz oscillator (no SYNC required), UCSP package footprint (3×4 mm), and synchronous rectification eliminating external Schottky diodes.
Technical Context
The MAX1820ZEBC+T implements a slope-compensated current-mode PWM controller supporting 0%–100% duty cycle operation, enabling true low-dropout regulation down to 0.4V output from a single Li+-cell input. Its internal P-channel high-side switch (0.3Ω typ RDS(ON)) and N-channel synchronous rectifier eliminate external diode losses and support efficient light-load operation via automatic pulse-skipping.
Dynamic output voltage is controlled via an analog REF input with 1.76× gain, referenced to a 0.227V internal reference (±5mV tolerance). The device operates in forced PWM mode when SKIP = BATT (3.3mA typical IQ) or normal skip mode when SKIP = GND (180µA typical IQ), with UVLO threshold fixed at 2.35V (typ) and shutdown current of 0.1µA (typ).
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 - supports real-time PA bias optimization in WCDMA handsets. |
| Max Output Current | 600mA guaranteed - sufficient to drive linear power amplifiers without external current boosting. |
| Switching Frequency | 1MHz fixed (internal oscillator), no external SYNC required - enables use of small 4.7µH inductors and 4.7µF ceramic output capacitors. |
| Dropout Voltage | 150mV at 600mA load (including inductor DCR) - maintains regulation even as battery discharges to ~2.9V for 3.4V output. |
| Quiescent Current | 180µA typical in skip mode - extends battery life during standby or low-Power amplifier states. |
| Shutdown Current | 0.1µA typical - ensures near-zero leakage during system sleep modes. |
| Package | 3×4 mm UCSP (chip-scale) - provides minimal PCB area consumption for space-constrained mobile RF modules. |
Pinout & Package
The MAX1820ZEBC+T is housed in a 10-terminal, 3×4 mm UCSP™ (Ultra Compact Surface Package) with bottom-side solder balls. Pin assignment follows standard UCSP ball grid layout with thermal pad exposed on underside for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SKIP | PWM/Skip-mode control input | Logic-low (GND) enables automatic pulse-skipping at light loads; logic-high (BATT) forces constant-frequency PWM - critical for RF noise management. |
| COMP | Compensation node | Connects to RC network (43kΩ + 330pF to GND) to stabilize loop response and ensure stability across 0.4V–3.4V output range. |
| OUT | Output voltage sense | Direct connection to VOUT enables accurate feedback for dynamic voltage regulation without external resistor divider. |
| REF | Analog reference input | Accepts 0.227V–1.932V DAC signal; output scales as VOUT = 1.76 × VREF - enables fast PA envelope tracking. |
| GND | Analog ground | Reference for error amplifier and internal bias circuits - must be routed separately from PGND to minimize noise coupling. |
| PGND | Power ground | High-current return path for LX switch and synchronous rectifier - requires low-inductance connection to minimize switching noise. |
| LX | Switch node | Connects to inductor; carries high dv/dt switching waveform - requires tight layout and guard ring to reduce EMI. |
| BATT | Input supply | 2.6V–5.5V battery input; bypassed with 10µF low-ESR capacitor to PGND - critical for maintaining stable input under pulsed PA loads. |
| SHDN | Active-low shutdown | Pulling to GND disables all circuitry and reduces IQ to 0.1µA; open or pulled to BATT enables operation. |
| SYNC | Sync input (NC) | No-connect for MAX1820ZEBC+T; must be tied to GND per datasheet - internal 1MHz oscillator only, no external sync capability. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamically adjustable output | Voltage set via analog REF input (0.227V–1.932V) with 1.76× gain and <30µs full-scale settling - enables precise, real-time PA bias control. |
| Synchronous rectification | Integrated N-channel rectifier eliminates need for external Schottky diode - improves efficiency by ~5–8% and reduces component count. |
| 100% duty-cycle operation | Supports dropout regulation down to (VOUT + 150mV) input - maintains PA bias stability as Li+ battery discharges from 4.2V to 2.9V. |
| Low-quiescent skip mode | 180µA typical IQ at light loads - extends talk time in WCDMA handset standby and low-power transmission modes. |
| UCSP package | 3×4 mm footprint with 0.5mm pitch - saves >60% board area vs. µMAX, ideal for ultra-thin mobile RF front-end modules. |
Applications
| WCDMA Power Amplifier Bias | Mobile Baseband Core Supply |
|---|---|
Use Scenario: Dynamically adjusting PA supply voltage in WCDMA handsets to match instantaneous transmit power requirements and maximize PA efficiency. IC Role / Device Role / Timing Role: Primary buck regulator delivering 0.4V–3.4V output under analog REF control with <30µs transient response - acts as envelope-tracking power source. Use Value: Reduces average PA power dissipation by up to 40% compared to fixed-voltage bias, extending battery life and lowering thermal load. | Use Scenario: Providing tightly regulated core voltage to baseband processors during variable computational load in smartphones and feature phones. IC Role / Device Role / Timing Role: Low-noise, high-transient-response buck converter supplying 1.2V–1.8V to ARM-based SoCs with rapid load-step handling. Use Value: Maintains processor stability during burst-mode operations (e.g., GPS acquisition, camera processing) without requiring oversized bulk capacitance. |
| Digital Camera Flash Driver Supply | PCMCIA/CardBus Interface Power |
Use Scenario: Generating adjustable bias for high-current LED flash drivers in compact digital cameras and smartphone camera modules. IC Role / Device Role / Timing Role: High-efficiency buck stage delivering 3.0V–3.4V at up to 600mA with fast turn-on and low dropout - powers flash ICs during short-duration bursts. Use Value: Enables brighter flash output from single-cell Li+ batteries while minimizing voltage sag and thermal rise during 200–500ms flash pulses. | Use Scenario: Supplying clean, regulated 3.3V power to PCMCIA or CardBus peripherals in portable computing devices. IC Role / Device Role / Timing Role: Standby-optimized buck regulator with 0.1µA shutdown current - powers card interface logic when host is active and disconnects cleanly during sleep. Use Value: Eliminates need for discrete LDO + enable logic, reducing BOM cost and PCB area while meeting PCMCIA hot-swap voltage ramp requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1821ZEUB+ | Fixed-output variant using external FB resistors; 1.25V–5.5V range; same 1MHz oscillator and UCSP-compatible µMAX package. | Designed for stable core supplies (e.g., microprocessor I/O rails), not dynamic PA bias - lacks REF input and OUT sense pin. | Select MAX1821ZEUB+ only when fixed output voltage suffices and analog control is unnecessary. |
| TPS62231DRYR | TI 600mA buck with 2.05V–6.0V input, 0.6V–5.5V output; 3.6MHz switching; 17µA quiescent current; 1.5mm × 1.5mm WSON package. | Higher switching frequency enables smaller passives but lacks dynamic analog control interface and UCSP thermal performance. | Choose TPS62231DRYR for ultra-compact size and lowest IQ, but verify REF-controlled settling meets PA envelope-tracking timing. |
Compared with MAX1821ZEUB+, the MAX1820ZEBC+T provides essential analog voltage control for RF power optimization; versus TPS62231DRYR, it offers superior thermal resistance in UCSP and proven WCDMA PA integration, albeit at higher quiescent current in skip mode.
Availability
MAX1820ZEBC+T is available at Aetrix Electronics and suitable for WCDMA handset design, mobile baseband power management, and compact digital camera flash systems requiring stable component supply, consistent UCSP packaging, and verified dynamic voltage control performance.
Supply support for MAX1820ZEBC+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for mobile, industrial, and communications markets.
The MAX1820/MAX1821 product line was designed specifically for battery-powered RF power amplifier biasing in 3G cellular handsets, emphasizing dynamic voltage control, low dropout, and minimal PCB footprint.
FAQ
What is the function of the REF pin on the MAX1820ZEBC+T?
The REF pin on the MAX1820ZEBC+T accepts an analog control voltage (0.227V–1.932V) that sets the output voltage via VOUT = 1.76 × VREF. This enables real-time, dynamic adjustment of the output - a core requirement for envelope-tracking power amplifiers in WCDMA systems. The MAX1820ZEBC+T uses this pin instead of a feedback resistor divider, distinguishing it from fixed-output regulators like the MAX1821.
Does the MAX1820ZEBC+T require an external synchronization signal?
No. The MAX1820ZEBC+T features an internal 1MHz oscillator and no SYNC capability - its SYNC pin must be connected to GND per the datasheet. This distinguishes it from MAX1820XEBC+T (13MHz sync) and MAX1820YEBC+T (19.8MHz sync) variants. The fixed internal clock simplifies design and eliminates external clock routing in noise-sensitive RF sections.
What is the minimum input voltage required for the MAX1820ZEBC+T to operate?
The MAX1820ZEBC+T has an undervoltage lockout (UVLO) threshold of 2.35V (typical), with 1% hysteresis. Operation begins when BATT rises above ~2.35V and ceases below ~2.20V. This ensures reliable startup from partially discharged Li+ cells while preventing erratic regulation near battery depletion - a critical safeguard for WCDMA PA bias integrity.
How does the MAX1820ZEBC+T achieve 100% duty-cycle operation?
The MAX1820ZEBC+T achieves 100% duty cycle by allowing the P-channel MOSFET on-time to exceed one oscillator period. When input voltage approaches output voltage plus IR drop (~150mV at 600mA), the high-side switch remains continuously on, functioning as a low-dropout linear regulator. This maintains regulation during deep battery discharge - a key advantage for single-cell WCDMA handset operation.
Can the MAX1820ZEBC+T be used with ceramic output capacitors?
Yes. The MAX1820ZEBC+T is fully compatible with low-ESR ceramic output capacitors (e.g., 4.7µF X5R/X7R). Its compensation network (43kΩ + 330pF from COMP to GND) is optimized for ceramic caps, eliminating the need for electrolytic or tantalum types. This reduces board area, improves reliability, and avoids aging-related capacitance drift common in wet electrolytics.
MAX1820ZEBC+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)
MAX1820ZEBC+T FAQ
1.How can I place an order for MAX1820ZEBC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1820ZEBC+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 MAX1820ZEBC+T reliable?
The price and inventory of MAX1820ZEBC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1820ZEBC+T is usually 5 days.
3.What payment methods are accepted for MAX1820ZEBC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1820ZEBC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1820ZEBC+T?
MAX1820ZEBC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1820ZEBC+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 MAX1820ZEBC+T?
For technical support, including MAX1820ZEBC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1820ZEBC+T requirements.
6.How does Aetrix verify that MAX1820ZEBC+T is sourced from the original manufacturer or authorized distributors?
All MAX1820ZEBC+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 MAX1820ZEBC+T meets industry standards.
7.What is the process for return or replacement of MAX1820ZEBC+T?
All MAX1820ZEBC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1820ZEBC+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 MAX1820ZEBC+T part is unused and in its original packaging.
Return procedure for MAX1820ZEBC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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