MAX1820 Maxim Integrated Products, MAX1820 Datasheet
MAX1820
Manufacturer Part Number
MAX1820
Description
(MAX1829 / MAX1821) W-cdma Cellular Phone 600mA Buck Regulators
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1820.pdf
(18 pages)
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The MAX1820/MAX1821 low-dropout, pulse-width-mod-
ulated (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 guar-
anteed 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 vary-
ing 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
Typical Operating Circuits continued at end of data sheet.
19-2011; Rev 2; 7/02
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
________________________Applications
UCSP is a trademark of Maxim Integrated Products, Inc.
Reliability Notice in the UCSP Reliability section of this data sheet for more information.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
*UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP
www.DataSheet4U.com
MAX1820ZEBC*
MAX1820YEBC*
MAX1820XEBC*
MAX1820ZEUB
MAX1820YEUB
MAX1820XEUB
WCDMA Cell Phone Power Amplifiers
PDA, Palmtop, and Notebook Computers
Microprocessor Core Supplies
Digital Cameras
PCMCIA and Network Cards
Hand-Held Instruments
PART
✕
________________________________________________________________ Maxim Integrated Products
4 chip-scale (UCSP™) packages.
FREQ (MHz)
No Sync
No Sync
SYNC
General Description
19.8
19.8
13
13
OUTPUT VOLTAGE
Dynamic
Dynamic
Dynamic
Dynamic
Dynamic
Dynamic
WCDMA Cellular Phone 600mA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
o Dynamically Adjustable Output from 0.4V to 3.4V
o Programmable Output from 1.25V to 5.5V
o SYNC to 13MHz External Clock (MAX1820X)
o SYNC to 19.8MHz External Clock (MAX1820Y)
o NO SYNC, Internal 1MHz Oscillator (MAX1820Z)
o Low Quiescent Current
o No External Schottky Diode Required
o 600mA Guaranteed Output Current
o 0% to 100% Duty-Cycle Operation
o 150mV Dropout at 600mA Load (Including R
o µMAX or UCSP Packaging
(MAX1820)
(MAX1821)
of External Inductor)
180µA (typ) in Skip Mode
0.1µA (typ) in Shutdown Mode
19.8MHz
13MHz
2.6V TO
INPUT
V
OUT
5.5V
OR
CONTROL
DAC
Typical Operating Circuits
Buck Regulators
PIN-PACKAGE
3
3
3
10 µMAX
10 µMAX
10 µMAX
✕
✕
✕
Ordering Information
4 UCSP
4 UCSP
4 UCSP
REF
BATT
SHDN
SYNC
SKIP
MAX1820
COMP
GND
PGND
OUT
LX
4.7 H
UCSP MARK
Features
AAM
AAB
AAL
4.7 F
—
—
—
DYNAMIC
OUTPUT
0.4V TO 3.4V
DC
1
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