MAX747 데이터 시트보기 (PDF) - Maxim Integrated
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MAX747 Datasheet PDF : 12 Pages
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High-Efficiency PWM, Step-Down
P-Channel DC-DC Controller
ABSOLUTE MAXIMUM RATINGS
Supply Voltage V+, AV+ to GND ..............................-0.3V to 17V
AGND to GND..........................................................-0.3V to 0.3V
Operating Temperature Ranges:
MAX747C_D .......................................................0°C to +70°C
All Other Pins................................................-0.3V to (V+ + 0.3V)
Reference Current (IREF) ....................................................±2mA
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 10.00mW/°C above +70°C) ..........800mW
SO (derate 8.33mW/°C above +70°C) .........................667mW
MAX747E_D.....................................................-40°C to +85°C
MAX747MJD ..................................................-55°C to +125°C
Junction Temperature
MAX747C_D/E_D .........................................................+150°C
MAX747MJD ...............................................................+175°C
CERDIP (derate 9.09mW/°C above +70°C) .................727mW
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
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+ = 10V, ILOAD = 0mA, IREF = 0mA, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
Input Voltage Range
V+ For regulated outputs
4
Output Voltage
VOUT
V+ = 6V to 15V, 0V < V+ - CS < 0.125V, FB = 0V
(includes line and load regulation)
4.85
5.08
Feedback Voltage
V+ - CS = 0V, external MAX747C
feedback mode
MAX747E/M
1.96 2.00
1.95 2.00
Line Regulation
V+ = 6V to 15V, FB = 0V
0.05
V+ = 4V to 15V, external feedback mode
Load Regulation
0V < V+ - CS < 0.125V
1.3
Efficiency
Circuit of Figure 1, ILOAD = 0.5A to 2.5A
91
OUT Leakage Current
VOUT = 5V
50
FB Input Logic Low
For dual-mode switchover
FB Input Leakage Current
FB = 2V
0.1
Reference Voltage
VREF IREF = 0µA
MAX747C
MAX747E/M
1.97 2.00
1.96 2.00
Reference Load Regulation
IREF = 0µA to 100µA
9
Soft-Start Source Current
SS = 0V
1
Soft-Start Fault Current
SS = 2V
100
500
Operating, V+ = 15V
0.95
Supply Current
Operating, V+ = 10V
0.8
Shutdown mode
0.6
Oscillator Frequency
fOSC
MAX747C
MAX747E/M
85
100
80
100
Maximum Duty Cycle
V+ = 6V
91
96
CS Amp ILIM Threshold
VLIMIT V+ - CS
125
150
EXT Output High
IEXT = -1mA (sourcing)
V+ – 0.1
EXT Output Low
IEXT = 1mA (sinking)
EXT Sink Current
VEXT = 7.5V
110
EXT Source Current
VEXT = 2.5V
170
CC Impedance
24
LBI Threshold Voltage
VTH LBI falling
MAX747C
MAX747EM
1.97 2.00
1.96 2.00
LBO Output Voltage Low
ISINK = 0.5mA
LBI Input Leakage Current
LBI = 2.5V
LBO Output Leakage Current
V+ = 15V, LBO = 15V, LBI = 2.5V
SHDN Input Voltage Low
VIL
SHDN Input Voltage High
VIH
2.0
SHDN Input Leakage Current
SHDN = 10V
0.1
MAX
15
5.25
2.04
2.05
0.1
2.5
80
40
100
2.03
2.04
20
1.3
20
115
120
175
0.25
2.03
2.04
0.4
100
1
0.4
100
UNITS
V
V
V
%V
%
%
µA
mV
nA
V
mV
µA
µA
mA
µA
kHz
%
mV
V
V
mA
mA
kΩ
V
V
nA
µA
V
V
nA
2 _______________________________________________________________________________________
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