MAX639 查看數據表（PDF） - Maxim Integrated
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MAX639 Datasheet PDF : 13 Pages
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5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
V+ ...........................................................................................12V
LX .........................................................(V+ - 12V) to (V+ + 0.3V)
LBI, LBO, VFB, SHDN, VOUT........................-0.3V to (V+ + 0.3V)
LX Output Current (Note 1) ......................................................1A
LBO Output Current ............................................................10mA
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:
MAX639C_ _ .......................................................0°C to +70°C
MAX639E_ _ ....................................................-40°C to +85°C
MAX639MJA ..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Peak inductor current must be limited to 600mA by using an inductor of 100µH or greater.
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.
ELECTRICAL CHARACTERISTICS
(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, ILOAD = 0mA, TA = TMIN to TMAX, typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETER
Supply Voltage
Supply Current
Output Voltage (Note 2)
Dropout Voltage
Efficiency
Switch On-Time
Switch Off-Time
CONDITIONS
MIN TYP MAX UNITS
4.0
11.5
V
SHDN = V+, no load
10
20
µA
MAX639, V+ = 6.0V to 11.5V, 0mA < IOUT < 100mA
4.80 5.00 5.20
MAX640, V+ = 4.0V to 11.5V, 0mA < IOUT < 100mA
3.17 3.30 3.43
V
MAX653, V+ = 4.0V to 11.5V, 0mA < IOUT < 100mA
2.88 3.00 3.12
IOUT = 100mA, L = 100µH
0.5
V
MAX639
IOUT = 100mA, L = 100µH
91
IOUT = 25mA, L = 470µH
94
MAX640
IOUT = 100mA, L = 100µH
87
%
IOUT = 25mA, L = 470µH
91
MAX653
IOUT = 100mA, L = 100µH
85
IOUT = 25mA, L = 470µH
89
MAX639
V+ = 9V, VOUT = 5V
V+ = 6V, VOUT = 3V
10.6 12.5 14.4
14.2 16.7 19.2
MAX640
V+ = 9V, VOUT = 3.3V
V+ = 4V, VOUT = 3.3V
7.5
8.8
10.1
µs
60.7 71.4 82.1
MAX653
V+ = 9V, VOUT = 3V
V+ = 4V, VOUT = 3V
7.1
8.3
9.5
42.5 50.0 57.5
MAX639
V+ = 9V, VOUT = 5V
V+ = 6V, VOUT = 3V
9.0
11.7 13.5
16.6 19.5 22.4
MAX640
V+ = 9V, VOUT = 3.3V
V+ = 4V, VOUT = 3.3V
13.3 15.6 17.9
µs
13.3 15.6 17.9
MAX653
V+ = 9V, VOUT = 3V
V+ = 4V, VOUT = 3V
14.6 17.2 19.8
14.6 17.2 19.8
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