MAX1641 datasheet(3/11 Pages) MAXIM

Part #	MAX1641

Description	Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier

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Manufacturer	MAXIM [Maxim Integrated Products]

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Adjustable-Output, Switch-Mode

Current Source with Synchronous Rectifier

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS

(VIN = +12V, VOUT = 6V, Circuit of Figure 2, TA = -40°C to +85°C, unless otherwise noted.)

IREF = 0 to 50µA

VOUT = 2V to 24V (MAX1640)

D0 = D1 = low

D0 or D1 = high

FET Drive Output Resistance

MAX1641

MAX1640

VIN = 5.5V to 26V,

ILOAD = 0 to 20mA

VIN = 5.5V to 26V,

ILOAD = 0 to 20mA

MAX1640

CONDITIONS

µA

1

VSET Input Current

mV

10

Reference Load Regulation

V

1.94

2.06

VREF

Reference Voltage

V

4.0

4.4

VLDOL Undervoltage Lockout

µA

1

Output Current in Off Mode

mA

4

Quiescent VIN Supply Current

%/V

0.4

Output Current Compliance

mV

34

48

Quarter-Scale Current-Sense

Threshold

12

Ω

Off-Time Range

V

5.5

26

VIN

Input Voltage Range

1.5

8

µs

Off-Time Accuracy

RTOFF = 62kΩ

1.5

2.5

µs

146

154

Pulse-Trickle Mode Duty-Cycle

Period

mV

141

159

Full-Scale Current-Sense

Threshold

V

VIN -

5.5

4.5

VLDOH

Linear-Regulator Output

Voltage, VIN Referenced

D0 = low, D1 = high, RTOFF = 50kΩ

25

42

ms

V

4.5

5.5

VLDOL

Linear-Regulator Output

Voltage, Ground Referenced

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

PWM Maximum Duty Cycle

100

%

Input Low Voltage

VIL

D0, D1

0.8

V

Input High Voltage

VIH

D0, D1

2.4

V

Input Leakage Current

IIN

D0, D1

±

1

µA

33

42

MAX1641

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +12V, VOUT = 6V, Circuit of Figure 2, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

CONDITIONS

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

PWM Maximum Duty Cycle

100

%

Input Low Voltage

VIL

D0, D1

0.8

V

Input High Voltage

VIH

D0, D1

2.4

V

Input Leakage Current

IIN

D0, D1

±

1

µA

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