MAX879L Maxim Integrated Products, MAX879L Datasheet
MAX879L
Manufacturer Part Number
MAX879L
Description
(MAX877L - MAX879L) Step-Up & Down DC-DC Converters
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX879L.pdf
(12 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX879LCSA
Manufacturer:
MAXIM/美信
Quantity:
20 000
Company:
Part Number:
MAX879LCSA+T
Manufacturer:
IDT
Quantity:
4 975
Company:
Part Number:
MAX879LESA+T
Manufacturer:
MAXIM
Quantity:
8 574
www.DataSheet4U.com
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
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
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.
________________________Applications
19-0186; Rev 2; 7/96
Active Rectifier is a trademark of Maxim Integrated Products.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
__________Typical Operating Circuit
_______________General Description
1V TO 4.5V
Adjustable Output, Step-Up DC-DC Converters
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
INPUT
22 F
ON/OFF
TM
turns off in the shutdown mode, disconnect-
________________________________________________________________ Maxim Integrated Products
2
1
7
IN
ILIM
SHDN
PGND
4
MAX777L
AGND
3
OUT
TM
LX
that eliminates the
5
6
Low-Voltage Input, 3V/3.3V/5V/
22µH
OUTPUT
5V
100µF
Ordering Information continued at end of data sheet.
* Dice are specified at T
**Contact factory for availability and processing to MIL-STD-883.
____________________________Features
______________Ordering Information
MAX777LCPA
MAX777LCSA
MAX777LC/D
MAX777LEPA
MAX777LESA
MAX777LMJA
__________________Pin Configuration
1V to 4.5V Input Guarantees Start-Up Under Load
Up to 210mA Output
Load Fully Disconnected in Shutdown
82% Efficiency
Output in Regulation with Input Voltage above
Output Voltage
Internal 1A Power Switch and Active Rectifier
Adjustable Current Limit Allows Low-Cost
Inductors
190µA No Load Supply Current
20µA Shutdown Supply Current
3V/3.3V (MAX778L), 5V (MAX777L), and
Adjustable (MAX779L) Output Voltage
*
TOP VIEW
SEL FOR MAX778L, FB FOR MAX779L.
PART
AGND
PGND
ILIM
IN
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
1
2
3
4
0°C to +70°C
0°C to +70°C
0°C to +70°C
A
= +25°C, DC parameters only.
MAX777L
MAX778L
MAX779L
DIP/SO
8
7
6
5
www.DataSheet4U.com
N.C. (MAX777L)
SHDN
OUT
LX
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
*
1
Related parts for MAX879L
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
MAX7528KCWPMaxim Integrated Products [CMOS Dual 8-Bit Buffered Multiplying DACs]
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Single +5V, fully integrated, 1.25Gbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Single +5V, fully integrated, 155Mbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Highly Integrated Level 2 SMBus Battery Chargers
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Current Monitor and Accumulator with Integrated Sense Resistor; ; Temperature Range: -40°C to +85°C
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TSSOP 14/A/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TSSOP 14/A/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
QFN 16/A/AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TDFN/A/65V, 1A, 600KHZ, SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED SWI
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
Integrated Temperature Controller f
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
SOT23-6/I/45MHz to 650MHz, Integrated IF VCOs with Differential Output
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
SOT23-6/I/45MHz to 650MHz, Integrated IF VCOs with Differential Output
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
EVALUATION KIT/2.4GHZ TO 2.5GHZ 802.11G/B RF TRANSCEIVER WITH INTEGRATED PA
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
QFN/E/DUAL PCIE/SATA HIGH SPEED SWITCH WITH INTEGRATED BIAS RESISTOR
Manufacturer:
Maxim Integrated Products
Datasheet: