MAX1820, MAX1820Y, MAX1820Z, MAX1821, MAX1821X WCDMA Cellular Phone 600mA Buck Regulators

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

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

I_OUT (A)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX1820

2.6

5.5

0.4

3.5

0.6

Dyn. REF In
Preset
Resistor

0.36

1000

•	Adjustable Frequency

•	Current Limit

•	External Synchronization

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•

Shutdown

•	Synchronous Rectifier

•	Voltage or PWM Controllable Output

Yes

UCSP/0
UCSP/10
uMAX/10

Yes

-40 to +85

$1.95 @ 1k

MAX1821

1.25

5.5

Preset
Resistor

•	Adjustable Frequency

•	Current Limit

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•

Shutdown

•	Synchronous Rectifier

uMAX/10

$1.84 @ 1k

See All Step-Down Switching Regulators (223)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Operating Freq. (kHz)

Internal Power Switch(es)

Package

Price^**

MAX1820

Step-Down

2.6

5.5

0.4

3.5

0.6

0.36

1000

Yes

UCSP/0
UCSP/10
uMAX/10

$1.95 @ 1k

MAX1821

1.25

5.5

uMAX/10

$1.84 @ 1k

See All Switch-Mode DC-DC Power Supplies (429)

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.

Reliability Reports


		Show FIT data for:

		Reliability Report: MAX1820ZEUB.pdf

		Request Reliability Report for:

Ordering Information

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. More: SeeFull Data Sheet or Part 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.

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;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12-9*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820XEBC+

UCSP;0 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12+9*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1820XEBC-T

UCSP;10 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12-9*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820XEBC+T

UCSP;0 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12+9*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1820EUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820XEUB-T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820XEUB+T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1820XEUB+

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1820XEUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820EUB-T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
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;0 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12+9*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1820YEBC+

UCSP;0 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12+9*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1820YEBC-T

UCSP;10 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12-9*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820YEBC

-40°C to +85°C

See data sheet

MAX1820YEUB-T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820YEUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
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;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12-9*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820ZEBC+

UCSP;0 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12+9*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1820ZEBC-T

UCSP;10 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12-9*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820ZEBC+T

UCSP;0 pin;
Dwg: 21-0104F (PDF)
Use pkgcode/variation: B12+9*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1820ZEUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1820ZEUB-T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
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

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1821EUB+

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1821EUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1821EUB-T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
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

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1821XEUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis