MAX877CSA Maxim Integrated Products, MAX877CSA Datasheet

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MAX877CSA

Manufacturer Part Number
MAX877CSA
Description
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX877CSA.pdf (12 pages)

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Part Number
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Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
MAX877CSA
Manufacturer:
MAX
Quantity:
5 510
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.
________________________Applications
19-0204; Rev 1; 5/94
™ Active Rectifier is a trademark of Maxim Integrated Products.
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
__________________Pin Configuration
*
TOP VIEW
SEL (MAX878), FB (MAX879)
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
AGND
PGND
ILIM
IN
________________________________________________________________ Maxim Integrated Products
1
2
3
4
Step-Up/Step-Down DC-DC Converters
MAX877
MAX878
MAX879
DIP/SO
8
7
6
5
N.C. (MAX877)
SHDN
OUT
LX
5V/3.3V/3V/Adjustable-Output,
*
____________________________Features
Ordering Information continued on last page.
* Contact factory for dice specifications.
__________Typical Operating Circuit
______________Ordering Information
MAX877CPA
MAX877CSA
MAX877C/D
MAX877EPA
MAX877ESA
MAX877MJA
Regulates from Inputs Above & Below the Output
1V to 6.2V Supply-Voltage Range
Internal 1A Active Rectifier with Input-to-Output
Disconnect in Shutdown
Up to 210mA Load Currents, Guaranteed
85% Efficiency
Only 3 External Components
Adjustable Current Limit
195µA Quiescent Supply Current
20µA Shutdown Supply Current
3V/3.3V/5V and Adjustable Output Voltage Versions
Available in 8-Pin DIP and SO Packages
1.8V TO 6.2V
PART
22 F
INPUT
ON/OFF
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
2
1
7
IN
ILIM
SHDN
8
SEL
MAX878
PGND
4
AGND
3
OUT
LX
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
PIN-PACKAGE
5
6
22µH
OUTPUT
3.3V
210mA
100µF
1

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MAX877CSA Summary of contents

Page 1

... Quiescent Supply Current 20µA Shutdown Supply Current 3V/3.3V/5V and Adjustable Output Voltage Versions Available in 8-Pin DIP and SO Packages ______________Ordering Information PART MAX877CPA MAX877CSA MAX877C/D MAX877EPA MAX877ESA MAX877MJA Ordering Information continued on last page. * Contact factory for dice specifications. __________Typical Operating Circuit INPUT 1 ...

Page 2

Step-Up/Step-Down DC-DC Converters ABSOLUTE MAXIMUM RATINGS Supply Voltage (IN to PGND) .......................................0V to +7V Output Short-Circuit Duration to PGND, AGND (Note 1)....30sec Voltage Applied to: LX (switch off).......................................................-0.3V to +7V (switch on) ...................................30sec short OUT – ...

Page 3

Step-Up/Step-Down DC-DC Converters ELECTRICAL CHARACTERISTICS (continued 2.7V 0mA 22µ LOAD typical values are MIN MAX A PARAMETER 6.2V – ...

Page 4

Step-Up/Step-Down DC-DC Converters __________________________________________T ypical Operating Characteristics (Circuit of Figure +25°C, unless otherwise noted.) A MAX877/MAX879 EFFICIENCY vs. LOAD CURRENT OUT ...

Page 5

Step-Up/Step-Down DC-DC Converters ____________________________T ypical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A SWITCHING WAVEFORMS— CONTINUOUS CONDUCTION A B 0mA C 5 s/div A: SWITCH VOLTAGE (LX PIN), 2V/div B: INDUCTOR CURRENT, 0.5A/div C: ...

Page 6

Step-Up/Step-Down DC-DC Converters ______________________________________________________________Pin Description PIN NAME 1 ILIM AGND 4 PGND OUT – — — — – N.C. (MAX877) SEL 8 (MAX878) FB (MAX879) _______________Detailed Description Operating ...

Page 7

Step-Up/Step-Down DC-DC Converters V IN DELAY TIMER t OFF DELAY TIMER t ON MAX878 7 SHDN SHUTDOWN CONTROL Figure 1. MAX878 Block Diagram With ILIM shorted to IN, the peak switch current of the internal NPN power switch is set ...

Page 8

Step-Up/Step-Down DC-DC Converters Active Rectifier The internal active rectifier of the MAX877/MAX878/ MAX879 replaces the external Schottky catch diode in normal boost operation. The rectifier consists of a PNP pass transistor and a unique control circuit which, in shutdown ...

Page 9

Step-Up/Step-Down DC-DC Converters 22µ OUT MAX879 7 SHDN ILIM FB AGND PGND 3 4 Figure 3. MAX879 Adjustable Voltage __________Applications Information Figure 4 shows a MAX877 ...

Page 10

Step-Up/Step-Down DC-DC Converters The MAX877/MAX878/MAX879’s high peak currents and high-frequency operation make PC layout impor- tant for minimum ground bounce and noise. Locate input bypass and output filter capacitors close to the device pins. All connections to the FB ...

Page 11

Step-Up/Step-Down DC-DC Converters __Ordering Information (continued) PART TEMP. RANGE MAX878CPA 0°C to +70°C 8 Plastic DIP MAX878CSA 0°C to +70° MAX878C/D 0°C to +70°C Dice* MAX878EPA -40°C to +85°C 8 Plastic DIP MAX878ESA -40°C to +85° ...

Page 12

Step-Up/Step-Down DC-DC Converters Step-Up/Step-Down DC-DC Converters ________________________________________________________Package Information ______________________________________________________________________________________ 45˚ 0.127mm ...

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