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MAX1820, MAX1820Y, MAX1820Z, MAX1821, MAX1821X

WCDMA Cellular Phone 600mA Buck Regulators

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

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.

Data Sheet

Download	Rev 3	(PDF, 624kB)
E-Mail

An evaluation kit is available: MAX1820EVKIT

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

Key Specifications:

Step-Down Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX1820

2.6

5.5

0.4

3.5

0.6

Dyn. REF In

1000

µMAX/10

UCSP/10

15.4

MAX1821

1.25

5.5

Resistor

µMAX/10

See All Step-Down Switching Regulators (284)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuits

Application Notes

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

Reliability Reports

Reliability Report:	MAX1820Z.pdf
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Software/Models

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Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1820EUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1820EUB-T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1820XEBC+T			Active	UCSP;10 pin;3.3 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			Active	UCSP;10 pin;3.3 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
MAX1820XEUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1820XEUB+			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1820XEUB+T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1820XEUB-T			Active	uMAX;10 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1820YEBC+T			Active	UCSP;10 pin;3.3 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			Active	UCSP;10 pin;3.3 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
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1820YEUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1820YEUB-T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1820ZEBC+T			Active	UCSP;10 pin;3.3 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			Active	UCSP;10 pin;3.3 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
MAX1820ZEUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1820ZEUB-T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1821EUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1821EUB+			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1821EUB+T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1821EUB-T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1821XEUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1821XEUB-T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* 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.

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Evaluation Kits

MAX1820EVKIT

Evaluation Kit for the MAX1820, MAX1821

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