MAX1821, MAX1821X

WCDMA Cellular Phone 600mA Buck Regulators


Please check latest availability status for a specific part variant.

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.
MAX1820, MAX1821: Typical Operating Circuits MAX1820, MAX1821: Typical Operating Circuits Enlarge+

Key Features

  • 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

Applications/Uses

  • Digital Still Cameras
  • Handheld Instruments (PDAs, Palmtops)
  • Microprocessor Core Supplies
  • PCMCIA and Network Cards
  • PDA, Palmtop, and Notebook Computers
  • WCDMA Cell Phone Power Amplifiers
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1820 2.65.50.43.4Dyn. REF In0.6InternalYes11000
UCSP (B)/12
UMAX/10
-
MAX1821 1.255.5Resistor
UMAX/10
$1.93 @1k
See All Step-Down Switching Regulators (404)
Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Quality and Environmental Data

Request Reliability Report for: MAX1821  MAX1821X 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

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