High-Efficiency PWM, Step-Down

P-Channel DC-DC Controller

2

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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

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

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

415

V

Output Voltage

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

91

%

OUT Leakage Current

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

1.97

2.00

2.03

V

Reference Load Regulation

920

mV

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

MAX747C

85

100

115

kHz

Maximum Duty Cycle

V+ = 6V

91

96

%

V+ - CS

125

150

175

mV

EXT Output High

V+ – 0.1

V

EXT Output Low

0.25

V

EXT Sink Current

110

mA

EXT Source Current

170

mA

CC Impedance

24

k

Ω

LBI Threshold Voltage

LBI falling

1.97

2.00

2.03

V

LBI Input Leakage Current

LBI = 2.5V

100

nA

SHDN Input Voltage Low

0.4

V

SHDN Input Voltage High

2.0

V

SHDN Input Leakage Current

SHDN = 10V

0.1

100

nA

LBO Output Leakage Current

V+ = 15V, LBO = 15V, LBI = 2.5V

1

µA

LBO Output Voltage Low

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