MAX1644 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1644

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

Maxim Integrated 

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

Synchronous Rectification and Internal Switches

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.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

Undervoltage Lockout

Threshold

VUVLO VIN falling, hysteresis = 40mV

2.5

2.6

2.7

FB Input Bias Current

IFB

Off-Time Default Period

tOFF

Off-Time Start-Up Period

On-Time Period

SS Source Current

SS Sink Current

SHDN Input Current

SHDN Input Low Threshold

SHDN Input High Threshold

FBSEL Input Current

tOFF

tON

ISS

ISS

I SHDN

VIL

VIH

VFB = 1.2V

RTOFF = 150kΩ

RTOFF = 30.1kΩ

RTOFF = 499kΩ

FB = GND

VSS = 1V

V SHDN = 0 to VCC

0

80

200

1.13 1.33 1.53

0.20 0.33

4.3

5.6

4 · tOFF

0.4

3.5

5

6.5

100

-0.5

0.5

0.8

2.0

-5

+5

FBSEL Logic Thresholds

Maximum Output RMS

Current

FBSEL = GND

FBSEL = REF

FBSEL = unconnected

FBSEL = VCC

0.9

0.7 · VCC

- 0.2

VCC - 0.2

0.2

1.3

0.7 · VCC

+ 0.2

5.8

UNITS

V

nA

µs

µs

µs

µA

µA

µA

V

V

µA

V

ARMS

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)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Input Voltage

Preset Output Voltage

VIN

VOUT

ILOAD = 0 to 2A,

VFB = VOUT

VIN = VCC = 4V to 5.5V,

FBSEL = unconnected

VIN = 3V to 5.5V, FBSEL = VCC

VIN = 3V to 5.5V, FBSEL = REF

3.0

3.276

2.48

1.08

5.5

V

3.390

2.57

V

1.12

Adjustable Output Voltage

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

FBSEL = GND or REF

VREF

VIN

V

Reference Voltage

PMOS Switch

On-Resistance

NMOS Switch

On-Resistance

Current-Limit Threshold

VREF

RON, P

ILX = 0.5A

RON, N

ILIMIT

ILX = 0.5A

VIN = 4.5V

VIN = 3V

VIN = 4.5V

VIN = 3V

1.08

1.12

V

150

mΩ

200

150

mΩ

200

2.3

3.5

A

Idle Mode Current

Threshold

IIM

0.2

0.7

A

No-Load Supply Current

FB Input Bias Current

Off-Time Default Period

IIN + ICC

IFB

tOFF

VFB = 1.2V

VFB = 1.2V

RTOFF = 150kΩ

360

µA

0

250

nA

1.03

1.63

µs

Note 2: Recommended operating frequency, not production tested.

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

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