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MAX877 Datasheet(PDF) 3 Page - Maxim Integrated Products

Part No. MAX877
Description  5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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 3 page
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5V/3.3V/3V/Adjustable-Output,
Step-Up/Step-Down DC-DC Converters
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 2.7V, ILOAD = 0mA, LX = 22µH, COUT = 100µF,
S
H
D
N
and ILIM connected to IN, AGND connected to PGND,
TA = TMIN to TMAX, typical values are at TA = +25°C, unless otherwise noted.)
Note 2: Output in regulation, VOUT = VOUT (nominal) ±4%.
Note 3: At high VIN to VOUT differentials, the maximum load current is limited by the maximum allowable power dissipation in the
package (see
Absolute Maximum Ratings and Maximum Output Current graphs in the Typical Operating Characteristics).
Note 4: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.
Note 5: VOUT is set to a target value of 5V by 0.1% external feedback resistors. VOUT is measured to be within 5V ±2.5%
to guarantee error-comparator trip point.
Note 6: Startup guaranteed under these load conditions.
PARAMETER
Maximum Switch On Time
CONDITIONS
MIN
TYP
MAX
VIN = 1V
12.6
UNITS
ISW = 400mA
µs
0.275
MAX877/MAX879
Current-Limit Temperature
Coefficient
1.3
-0.3
%/°C
Current Limit
1.0
µs
Minimum Switch Off Time
ISW = 600mA
0.33
Switch Saturation Voltage
ISW = 1000mA
0.50
V
MAX878
2.3
µs
ISW = 400mA
VIN = 2.5V
4.0
0.21
VIN = 1.8V
5.9
ISW = 600mA
0.31
Rectifier Forward Voltage Drop
S
H
D
N
Threshold
ISW = 1000mA
0.50
V
VIN = 1V to 6.2V
VIN/2 +0.25
Error-Comparator Trip Point
(VREF)
MAX879, VIN = 1.8V to 5V (Note 5)
197.5
202.5
207.5
mV
FB Pin Bias Current
VIN = 2.7V
1.3
1.7
MAX879
10
40
nA
Switch Off Leakage Current
S
H
D
N
Enable Delay
0.1
150
Rectifier Off Leakage Current
0.1
µA
V
A
µA




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