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Maxim > Products > [Power and Battery Management] 
MAX1820, MAX1820Y, MAX1820Z, MAX1821, MAX1821X
WCDMA Cellular Phone 600mA Buck Regulators


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Data Sheet
FULL DATA SHEET (PDF, 624kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1820/MAX1821 low-dropout, pulse-width-modulated (PWM) DC-DC buck regulators are optimized to provide power to the power amplifier (PA) in WCDMA cell phones; however, they may be applied in many other applications where high efficiency is a priority. The supply voltage range is from 2.6V to 5.5V, and the guaranteed output current is 600mA; 1MHz PWM switching allows for small external components, while skip mode reduces quiescent current to 180µA with light loads.

The MAX1820 is dynamically controlled to provide varying output voltages from 0.4V to 3.4V. The circuit is designed such that the output voltage settles in <30µs for a full-scale change in voltage and current. The MAX1821 is set with external resistors to provide any fixed output voltage in the 1.25V to 5.5V range.

The MAX1820/MAX1821 include a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count; 100% duty-cycle operation allows for low dropout of only 150mV at 600mA load, including the external inductor resistance. The devices are offered in 10-pin µMAX® and tiny 3 x 4 chip-scale (UCSP™) packages.

Key Features   Applications/Uses
  • Dynamically Adjustable Output from 0.4V to 3.4V (MAX1820)
  • Programmable Output from 1.25V to 5.5V (MAX1821)
  • SYNC to 13MHz External Clock (MAX1820X)
  • SYNC to 19.8MHz External Clock (MAX1820Y)
  • NO SYNC, Internal 1MHz Oscillator (MAX1820Z)
  • Low Quiescent Current
    • 180µA (typ) in Skip Mode
    • 0.1µA (typ) in Shutdown Mode
  • No External Schottky Diode Required
  • 600mA Guaranteed Output Current
  • 0% to 100% Duty-Cycle Operation
  • 150mV Dropout at 600mA Load (Including RDC of External Inductor)
  • µMAX or UCSP Packaging

 
  		• Digital Still Cameras
  		• Handheld Instruments (PDAs, Palmtops)
  		• Microprocessor Core Supplies
  		• PCMCIA and Network Cards
  		• PDA, Palmtop, and Notebook Computers
  		• WCDMA Cell Phone Power Amplifiers

    Key Specifications:   Step-Down Switching Regulators
    Part Number VIN (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) IOUT (A) IOUT (A) Output Adj. Method Operating Current, ICC (max) (mA) Number of DC-DC Outputs Operating Freq. (kHz) Package Smallest Available Package (max w/pins) (mm2) Price**
    MAX1820  2.6 5.5 0.4 3.5 0.6 0.6 Dyn. REF In
    Preset
    Resistor     		0.36 1 1000 µMAX/10
    UCSP/10     		3 $1.95 @ 1k
    MAX1821  1.25 5.5 Preset
    Resistor     		µMAX/10 15 $1.84 @ 1k
    See All Step-Down Switching Regulators (252)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX1820, MAX1821: Typical Operating Circuits
    Typical Operating Circuits

    Application Notes
  		• Application Note 1205: W-CDMA Power Supply Dramatically Improves Transmit Efficiency - MAX1820
  		• Application Note 2233: Block Diagram and Description of Maxim's TDD-WCDMA Transceiver Solution at 1.9GHz - MAX1821

    Evaluation Kits
  		• MAX1820EVKIT

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-28 of 28

    MAX1820 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1820XEBC  
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12-9*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820XEBC+  
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12+9*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1820XEBC-T    
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12-9*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820XEBC+T    
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12+9*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1820EUB    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820XEUB-T    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820XEUB+T    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1820XEUB+  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1820XEUB    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820EUB-T    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820Y Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1820YEBC+T    
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12+9*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1820YEBC+  
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12+9*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1820YEBC-T    
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12-9*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820YEBC  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1820YEUB-T    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820YEUB    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820Z Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1820ZEBC  
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12-9*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820ZEBC+  
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12+9*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1820ZEBC-T    
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12-9*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820ZEBC+T    
    		UCSP;10 pin;3 mm²
    Outline Drawing: 21-0104 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B12+9*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1820ZEUB    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1820ZEUB-T    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1821 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1821EUB+T    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1821EUB+  
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1821EUB    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1821EUB-T    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1821X Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1821XEUB-T    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1821XEUB    
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    More Information
  		• Topmark Coding: MAX1820 MAX1821
  		• New Product Press Release 2001-05-14 

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    Document Ref.: 19-2011; Rev 3; 2005-07-04
    This page last modified: 2007-07-24


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