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MAX778LCSA ,Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC ConvertersFeaturesThe MAX777L/MAX778L/MAX779L are pulse-skipping DC-DC' 1V to 4.5V Input Guarantees Start-Up ..
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MAX777LCSA-MAX778LCSA-MAX778LESA-MAX779LCSA-MAX779LESA
Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
_______________General DescriptionThe 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 RectifierTMthat 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 RectifierTMturns 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.
________________________ApplicationsSingle 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
____________________________Features1V to 4.5V Input Guarantees Start-Up Under LoadUp to 210mA OutputLoad Fully Disconnected in Shutdown82% EfficiencyOutput in Regulation with Input Voltage above
Output VoltageInternal 1A Power Switch and Active RectifierAdjustable Current Limit Allows Low-Cost
Inductors190µA No Load Supply Current20µA Shutdown Supply Current3V/3.3V (MAX778L), 5V (MAX777L), and
Adjustable (MAX779L) Output Voltage
______________Ordering Information
Ordering Information continued at end of data sheet.* Dice are specified at TA= +25°C, DC parameters only.
**Contact factory for availability and processing to MIL-STD-883.
MAX777L/MAX778L/MAX779L
Low-Voltage Input, 3V/3.3V/5V/
Adjustable Output, Step-Up DC-DC Converters
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration
__________Typical Operating Circuit
& the latest literature: http://, Active Rectifier is a trademark of Maxim Integrated Products.
MAX777L/MAX778L/MAX779L
Low-Voltage Input, 3V/3.3V/5V/
Adjustable Output, Step-Up DC-DC Converters_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= +2.5V, ILOAD= 0mA, L = 22µH, COUT= 100µF, SHDNand ILIM connected to IN, AGND connected to PGND, TA= TMINto TMAX,
typical values are at TA= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (IN to PGND).......................................0V to 4.5V
Output Short-Circuit Duration to PGND, AGND (Note 1)....30sec
Voltage Applied to:
LX (switch off).......................................................-0.3V to 4.5V
(switch on)....................................30sec short to IN or OUT
OUT, SHDN...........................................................-0.3V to +7V...........................................................-0.3V to (OUT + 0.3V)
AGND to PGND........................................................-0.3V, +0.3V
Reverse Battery Current....................................................900mA
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C).............727mW
SO (derate 5.88mW/°C above +70°C)..........................471mW
CERDIP (derate 8.00mW/°C above +70°C)..................640mW
Operating Temperature Ranges:
MAX77_LC_A.......................................................0°C to +70°C
MAX77_LE_A....................................................-40°C to +85°C
MAX77_LMJA.................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
Note 1:The output may be shorted to ground if the package power dissipation is not exceeded.
MAX777L/MAX778L/MAX779L
Low-Voltage Input, 3V/3.3V/5V/
Adjustable Output, Step-Up DC-DC Converters
_______________________________________________________________________________________3
Note 2:Output in regulation, VOUT= VOUT(nominal) ±4%.
Note 3:At high VINto VOUTdifferentials, the maximum load current is limited by the maximum allowable power dissipation in the
package (see Absolute Maximum Ratings).
Note 4:Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.
Note 5:VOUTis set to a target value of +5V by 0.1% external feedback resistors. VOUTis measured to be 5V ±2.5% to guarantee the
error comparator trip point.
Note 6:Start-Up guaranteed under these load conditions.
ELECTRICAL CHARACTERISTICS (continued)(VIN= +2.5V, ILOAD= 0mA, L = 22µH, COUT= 100µF, SHDNand ILIM connected to IN, AGND connected to PGND, TA= TMINto TMAX,
typical values are at TA= +25°C, unless otherwise noted.)
MAX777L/MAX778L/MAX779L
Low-Voltage Input, 3V/3.3V/5V/
Adjustable Output, Step-Up DC-DC Converters_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics(Typical Operating Circuit, TA= +25°C, unless otherwise noted).5
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE AND TEMPERATUREMAX777-7
INPUT VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (706
MAX778L
SHDN THRESHOLD VOLTAGE
vs. INPUT VOLTAGE AND TEMPERATURE
MAX777-8
INPUT VOLTAGE (V)
SHDN THRESHOLD VOLTAGE (V)
MAX777L/MAX779L
EFFICIENCY vs. LOAD CURRENT
MAX777-1
LOAD CURRENT (mA)
EFFICIENCY (%)100
MAX778L
EFFICIENCY vs. LOAD CURRENT
MAX777-2
LOAD CURRENT (mA)
EFFICIENCY (%)100
MAX777L/MAX779L
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX777-4
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
MAX778L
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX777-5
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
NO-LOAD SUPPLY CURRENT
vs. VOLTAGE AND TEMPERATURE
MAX777-6
SUPPLY VOLTAGE (V)
NO-LOAD SUPPLY CURRENT (µA)
1006
MAX777L/MAX778L/MAX779L
Low-Voltage Input, 3V/3.3V/5V/
Adjustable Output, Step-Up DC-DC Converters
_______________________________________________________________________________________5
_____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1, TA= +25°C, unless otherwise noted.)
MAX777L/MAX778L/MAX779L
Low-Voltage Input, 3V/3.3V/5V/
Adjustable Output, Step-Up DC-DC Converters_______________________________________________________________________________________
_____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1, TA= +25°C, unless otherwise noted.)
______________________________________________________________Pin Description
