Adjustable-Output, Switch-Mode

Current Source with Synchronous Rectifier

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

Note 1: This ratio is generated by a 1:8 clock divider and is not an error source for current calculations.

IN to GND ...............................................................-0.3V to +28V

LDOH to IN ...............................................................+0.3V to -6V

LDOL to GND ...........................................................-0.3V to +6V

D0, D1 to GND .........................................................-0.3V to +6V

CS+, CS- to GND ...................................................-0.3V to +28V

PGND to GND.....................................................................±0.3V

QSOP (derate 8.30mW/°C above +70°C) ................... 667mW

Operating Temperature Range

MAX164_EEE ...................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10sec) ............................ +300°C

D0 = D1 = low

D0 = D1 = low (off mode)

D0 or D1 = high

MAX1641

MAX1641

MAX1640

MAX1640

CONDITIONS

µA

1

mV

4

10

Reference Load Regulation

V

1.96

2.00

2.04

Reference Voltage

V

4.05

4.20

4.35

µA

1

Output Current in Off Mode

500

mA

2

4

0.1

%/V

0.1

0.4

Output Current Compliance

%/V

0.03

Current-Sense Line Regulation

34

37.5

41

mV

36

42

48

147

150

153

mV

142

150

158

Full-Scale Current-Sense

Threshold

V

5.5

5.0

4.5

Linear-Regulator Output

V

4.5

5.0

5.5

Linear-Regulator Output

Voltage, Ground Referenced

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

V

5.5

26

Input Voltage Range

FET Drive Output Resistance

PFET and NFET drive

12

Ω

Off-Time Range

1

10

µs

Off-Time Accuracy

1.7

2.2

2.7

µs

Pulse-Trickle Mode Duty-Cycle

Period

27

33

40

ms

Pulse-Trickle Mode Duty Cycle

(Note 1)

12.5

%

Quarter-Scale Current-Sense

Threshold

MAX1640

MAX1641

µA