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MAX877 Datasheet(PDF) 4 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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 4 page
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5V/3.3V/3V/Adjustable-Output,
Step-Up/Step-Down DC-DC Converters
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(Circuit of Figure 4, TA = +25°C, unless otherwise noted.)
90
40
0.1
1
1000
MAX877/MAX879
EFFICIENCY vs. LOAD CURRENT
50
LOAD CURRENT (mA)
60
70
80
10
100
30
VIN = 2.5V
VIN = 6.2V
VIN = 1.8V
VOUT = 5V
VIN = 5V
VIN = 4V
90
40
0.1
1
1000
MAX878
EFFICIENCY vs. LOAD CURRENT
50
LOAD CURRENT (mA)
60
70
80
10
100
30
VIN = 2.5V
VIN = 3.3V
VIN = 1.8V
VOUT = 3.3V OR 3.0V
VIN = 5V
VIN = 6.2V
350
100
01
MAX877/MAX879 MAXIMUM OUTPUT
CURRENT AT LOW INPUT VOLTAGE
150
INPUT VOLTAGE (V)
200
250
300
23
0
VOUT = 5V
50
350
50
03
MAX878 MAXIMUM OUTPUT
CURRENT vs. INPUT VOLTAGE
100
INPUT VOLTAGE (V)
150
200
250
67
0
TA = +70°C
300
12
4
5
VOUT = 3.0V
DIP PACKAGE
DISSIPATION LIMIT
SO PACKAGE
DISSIPATION LIMIT
2.0
12
5
SHDN THRESHOLD VOLTAGE
vs. INPUT VOLTAGE AND TEMPERATURE
2.5
INPUT VOLTAGE (V)
3.0
3.5
34
1.5
0.5
1.0
7
6
TA = +25°C
TA = -55°C
TA = +125°C
300
200
12
5
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
220
SUPPLY VOLTAGE (V)
240
260
280
34
180
(SWITCH = OFF)
120
140
160
100
7
6
TA = 0°C
TA = -40°C
TA = +25°C
TA = +85°C
50
12
5
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE AND TEMPERATURE
60
INPUT VOLTAGE (V)
70
80
34
40
10
20
30
0
7
6
TA = 0°C
TA = -40°C
TA = +85°C
A: IOUT, 200mA/div, 0mA to 200mA
B: VOUT, 50mV/div, AC COUPLED
MAX878, VOUT = 3.3V, VIN = 2.5V
LOAD-TRANSIENT RESPONSE
A
B
2ms/div
A: VIN, 2V/div, 2V to 4V
B: VOUT, 50mV/div, AC COUPLED
IOUT = 240mA
MAX878, VOUT = 3.3V, CINBYPASS = 47µF
LINE-TRANSIENT RESPONSE
GND
2ms/div
A
B




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