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MAX779LCSA

Description
Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
CategoryPower/power management    The power supply circuit   
File Size117KB,12 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Parametric View All

MAX779LCSA Overview

Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters

MAX779LCSA Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerMaxim
Parts packaging codeSOIC
package instructionSOP, SOP8,.25
Contacts8
Reach Compliance Code_compli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE FREQUENCY MODULATION
Maximum input voltage4.5 V
Minimum input voltage1.1 V
Nominal input voltage2.5 V
JESD-30 codeR-PDSO-G8
JESD-609 codee0
length4.9 mm
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP8,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)245
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationBOOST
Maximum switching frequency150 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3.9 mm
Base Number Matches1
19-0186; Rev 2; 7/96
ANUAL
N KIT M
LUATIO ATA SHEET
EVA
WS D
FOLLO
Low-Voltage Input, 3V/3.3V/5V/
Adjustable Output, Step-Up DC-DC Converters
____________________________Features
o
1V to 4.5V Input Guarantees Start-Up Under Load
o
Up to 210mA Output
o
Load Fully Disconnected in Shutdown
o
82% Efficiency
o
Output in Regulation with Input Voltage above
Output Voltage
o
Internal 1A Power Switch and Active Rectifier
o
Adjustable Current Limit Allows Low-Cost
Inductors
o
190µA No Load Supply Current
o
20µA Shutdown Supply Current
o
3V/3.3V (MAX778L), 5V (MAX777L), and
Adjustable (MAX779L) Output Voltage
_______________General Description
The MAX777L/MAX778L/MAX779L are pulse-skipping DC-DC
converters that step up from low-voltage inputs (1V guaran-
teed). They require only three external components—an induc-
tor (typically 22µH) and two capacitors. The MAX777L delivers
a 5V output, the MAX778L generates pin-selectable voltages of
3.0V or 3.3V, and the MAX779L output can be adjusted from
2.5V to 6V through an external resistive divider.
The devices include an Active Rectifier
TM
that eliminates the
need for an external catch diode, and permits regulation even
when the input is greater than the output. Also, unlike those in
other step-up converters, the MAX777L/MAX778L/MAX779L’s
Active Rectifier
TM
turns off in the shutdown mode, disconnect-
ing the output from the source. This eliminates the current drain
associated with conventional step-up converters when off or in
shutdown.
High-frequency operation (up to 150kHz) allows the use of
small, surface-mount inductors with values of 10µH or less.
Supply current is 190µA under no load and only 20µA in stand-
by mode; supply voltage can range from 1V to 4.5V (1 to 3
cells). With a 2V input, the devices typically deliver 200mA at
5V, or 300mA at 3V.
For fully specified devices designed for step-up/step-down
applications (where the input can be above or below the out-
put), refer to the MAX877L/MAX878L/MAX879L data sheet.
MAX777L/MAX778L/MAX779L
______________Ordering Information
PART
MAX777LCPA
MAX777LCSA
MAX777LC/D
MAX777LEPA
MAX777LESA
MAX777LMJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
________________________Applications
Single Battery-Cell (1V), Step-Up Voltage Conversion
Efficient, High-Power Step-Up Regulation from
Low Input Voltages
Pagers
Portable Instruments & Hand-Held Terminals
Notebook and Palmtop Computers
Ordering Information continued at end of data sheet.
* Dice are specified at T
A
= +25°C, DC parameters only.
**Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit
INPUT
1V TO 4.5V
2
__________________Pin Configuration
TOP VIEW
22µF
IN
ILIM
MAX777L
SHDN
PGND
4
LX
OUT
AGND
3
5
6
22µH
ILIM 1
IN 2
8
N.C. (MAX777L)
*
SHDN
OUT
LX
1
7
ON/OFF
OUTPUT
5V
100µF
AGND 3
PGND 4
MAX777L
MAX778L
MAX779L
7
6
5
DIP/SO
*
SEL FOR MAX778L, FB FOR MAX779L.
Active Rectifier is a trademark of Maxim Integrated Products.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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