MAX1644EAE-T datasheet(3/11 Pages) MAXIM

Part #	MAX1644EAE-T

Description	2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

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Manufacturer	MAXIM [Maxim Integrated Products]

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2A, Low-Voltage, Step-Down Regulator with

Synchronous Rectification and Internal Switches

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VCC = +3.3V, FBSEL = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

ELECTRICAL CHARACTERISTICS

(VIN = VCC = +3.3V, FBSEL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)

Note 2: Recommended operating frequency, not production tested.

Note 3: Specifications from 0°C to -40°C are guaranteed by design, not production tested.

RTOFF = 150k

Ω

VFB = 1.2V

ILX = 0.5A

VIN = 3.0V to 5.5V, ILOAD = 0,

FBSEL = GND or REF

ILX = 0.5A

CONDITIONS

µs

1.03

1.63

tOFF

Off-Time Default Period

nA

0

250

IFB

FB Input Bias Current

µA

360

IIN + ICC

No-Load Supply Current

A

0.2

0.7

IIM

Idle Mode Current

Threshold

A

2.3

3.5

ILIMIT

Current-Limit Threshold

m

Ω

200

RON, P

PMOS Switch

On-Resistance

m

Ω

150

200

RON, N

2.48

2.57

3.276

3.390

V

3.0

5.5

VIN

Input Voltage

V

1.08

1.12

VREF

Reference Voltage

V

VREF

VIN

Adjustable Output Voltage

1.08

1.12

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

VIN = VCC = 4V to 5.5V,

FBSEL = unconnected

VIN = 3V to 5.5V, FBSEL = VCC

VIN = 3V to 5.5V, FBSEL = REF

VIN = 4.5V

VIN = 3V

NMOS Switch

On-Resistance

150

VIN = 4.5V

VIN = 3V

V

ILOAD = 0 to 2A,

VFB = VOUT

VOUT

Preset Output Voltage

Maximum Output RMS

Current

ARMS

SS Sink Current

ISS

100

µA

SHDN Input Current

I SHDN

-0.5

0.5

µA

SS Source Current

ISS

3.5

5

6.5

µA

SHDN Input Low Threshold

VIL

0.8

V

SHDN Input High Threshold

VIH

2.0

V

FBSEL Input Current

-5

+5

µA

0.9

1.3

5.8

VSS = 1V

V SHDN = 0 to VCC

FBSEL = REF

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

Undervoltage Lockout

Threshold

VUVLO

2.5

2.6

2.7

V

FB Input Bias Current

IFB

0

80

200

nA

tOFF

1.13

1.33

1.53

0.20

0.33

Off-Time Start-Up Period

tOFF

4

· tOFF

µs

On-Time Period

tON

0.4

µs

CONDITIONS

VFB = 1.2V

RTOFF = 150k

Ω

RTOFF = 30.1k

Ω

VIN falling, hysteresis = 40mV

FB = GND

Off-Time Default Period

4.3

5.6

µs

RTOFF = 499k

Ω

FBSEL Logic Thresholds

0.2

V

FBSEL = GND

0.7

· VCC

0.7

· VCC

- 0.2

+ 0.2

FBSEL = unconnected

VCC - 0.2

FBSEL = VCC

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