MAX747
High-Efficiency PWM, Step-Down
P-Channel DC-DC Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Supply Voltage V+, AV+ to GND..............................-0.3V to 17V
AGND to GND..........................................................-0.3V to 0.3V
All Other Pins................................................-0.3V to (V+ + 0.3V)
Reference Current (I
REF
) ....................................................±2mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 10.00mW/°C above +70°C) ..........800mW
SO (derate 8.33mW/°C above +70°C).........................667mW
CERDIP (derate 9.09mW/°C above +70°C).................727mW
Operating Temperature Ranges:
MAX747C_D .......................................................0°C to +70°C
MAX747E_D.....................................................-40°C to +85°C
MAX747MJD..................................................-55°C to +125°C
Junction Temperature
MAX747C_D/E_D.........................................................+150°C
MAX747MJD ...............................................................+175°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
ELECTRICAL CHARACTERISTICS
(V+ = 10V, I
LOAD
= 0mA, I
REF
= 0mA, T
A
= T
MIN
to T
MAX
, 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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V+ For regulated outputs 415V
Output Voltage V
OUT
V+ = 6V to 15V, 0V < V+ - CS < 0.125V, FB = 0V
(includes line and load regulation)
4.85 5.08 5.25 V
Feedback Voltage
1.96 2.00 2.04
V
V+ = 6V to 15V, FB = 0V 0.05
Line Regulation
V+ = 4V to 15V, external feedback mode 0.1
%V
Load Regulation 0V < V+ - CS < 0.125V 1.3 2.5 %
Efficiency Circuit of Figure 1, I
LOAD
= 0.5A to 2.5A 91 %
OUT Leakage Current V
OUT
= 5V 50 80 µA
FB Input Logic Low For dual-mode switchover 40 mV
FB Input Leakage Current FB = 2V 0.1 100 nA
Reference Voltage I
REF
= 0µA
1.97 2.00 2.03
V
Reference Load Regulation I
REF
= 0µA to 100µA 920mV
Soft-Start Source Current SS = 0V 1 µA
Soft-Start Fault Current SS = 2V 100 500 µA
Operating, V+ = 15V 0.95 1.3
Operating, V+ = 10V 0.8
mA
Supply Current
Shutdown mode 0.6 20 µA
Oscillator Frequency f
OSC
MAX747C 85 100 115
kHz
Maximum Duty Cycle V+ = 6V 91 96 %
CS Amp I
LIM
Threshold V
LIMIT
V+ - CS 125 150 175 mV
EXT Output High I
EXT
= -1mA (sourcing) V+ – 0.1 V
EXT Output Low I
EXT
= 1mA (sinking) 0.25 V
EXT Sink Current V
EXT
= 7.5V 110 mA
EXT Source Current V
EXT
= 2.5V 170 mA
CC Impedance 24 kΩ
LBI Threshold Voltage V
TH
LBI falling
1.97 2.00 2.03
V
LBI Input Leakage Current LBI = 2.5V 100 nA
SHDN Input Voltage Low V
IL
0.4 V
SHDN Input Voltage High V
IH
2.0 V
SHDN Input Leakage Current SHDN = 10V 0.1 100 nA
V
REF
LBO Output Leakage Current V+ = 15V, LBO = 15V, LBI = 2.5V 1 µA
LBO Output Voltage Low I
SINK
= 0.5mA 0.4 V
MAX747C
MAX747EM 1.96 2.00 2.04
MAX747E/M 80 100 120
MAX747C
MAX747E/M 1.96 2.00 2.04
V+ - CS = 0V, external
feedback mode
MAX747C
MAX747E/M 1.95 2.00 2.05
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