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MAX879CSA

Description
5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters
CategoryPower/power management    The power supply circuit   
File Size125KB,12 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Parametric View All

MAX879CSA Overview

5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters

MAX879CSA Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
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 voltage6.2 V
Minimum input voltage1 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 current0.24 A
Nominal output voltage0.2025 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP8,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height1.75 mm
Maximum supply current (Isup)0.31 mA
surface mountYES
Switch configurationBOOST
Maximum switching frequency300 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
19-0204; Rev 1; 5/94
UAL
IT MAN
TION K
A
EET
EVALU
ATA SH
OWS D
FOLL
5V/3.3V/3V/Adjustable-Output,
Step-Up/Step-Down DC-DC Converters
____________________________Features
o
Regulates from Inputs Above & Below the Output
o
1V to 6.2V Supply-Voltage Range
o
Internal 1A Active Rectifier with Input-to-Output
Disconnect in Shutdown
o
Up to 210mA Load Currents, Guaranteed
o
85% Efficiency
o
Only 3 External Components
o
Adjustable Current Limit
o
195µA Quiescent Supply Current
o
20µA Shutdown Supply Current
o
3V/3.3V/5V and Adjustable Output Voltage Versions
o
Available in 8-Pin DIP and SO Packages
_______________General Description
The MAX877/MAX878/MAX879 are pulse-skipping, step-
up/step-down DC-DC converters that provide a regulated
output from inputs both above and below the output. They
require only three external components—an inductor
(typically 22µH) and two filter capacitors.
The MAX877 delivers a regulated 5V output from 2.5V to
6.2V inputs. The MAX878 generates pin-selectable volt-
ages of 3.0V or 3.3V from 1.5V to 6.2V inputs. The MAX879
output can be adjusted from 2.5V to 6V via an external
resistor divider from 2.5V to 6.2V inputs.
A unique high-power, internal, synchronous rectifier design
(Active Rectifier™) enables the devices to regulate in a
switched linear mode if the input voltage is higher than the
desired output voltage. When the input voltage falls below
the output voltage, the MAX877/MAX878/MAX879 will
smoothly switch into a pulse-skipping boost mode and
step up from input voltages as low as 1V. In shutdown, the
active rectifier disconnects the output from the source. This
stops the current drain from input to output associated with
conventional step-up converters.
High-frequency operation (up to 300kHz) allows the use of
small surface-mount inductors. Supply current is 195µA
under no load, and only 20µA in shutdown mode. For 1-cell
(1V) step-up converters with similar performance and the
same pinout, refer to the MAX777/MAX778/MAX779 data
sheet.
MAX877/MAX878/MAX879
______________Ordering Information
PART
MAX877CPA
MAX877CSA
MAX877C/D
MAX877EPA
MAX877ESA
MAX877MJA
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
Two or Three NiCd Cells to 3V/3.3V Conversion
Three or Four Alkaline Cells to 5V Conversion
One Lithium Cell to 3V/3.3V Conversion
Pagers
Palmtop and Notebook Computers
Battery-Powered and Hand-Held Instruments
Ordering Information continued on last page.
* Contact factory for dice specifications.
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
INPUT
1.8V TO 6.2V
2
22µF
IN
ILIM
MAX878
SHDN
SEL
8
PGND
4
LX
OUT
AGND
3
5
6
22µH
ILIM 1
IN 2
AGND 3
PGND 4
8
N.C. (MAX877)
*
SHDN
ON/OFF
OUT
LX
1
7
MAX877
MAX878
MAX879
7
6
5
OUTPUT
3.3V
210mA
100µF
DIP/SO
*
SEL (MAX878), FB (MAX879)
™ Active Rectifier is a trademark of Maxim Integrated Products.
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
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