MAX8643A datasheet(4/16 Pages) MAXIM

Part #	MAX8643A

Description	3A, 2MHz Step-Down Regulator with Integrated Switches

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Manufacturer	MAXIM [Maxim Integrated Products]

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4 / 16 page

3A, 2MHz Step-Down Regulator

with Integrated Switches

4

_______________________________________________________________________________________

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ENABLE

EN Input Logic-Low, Falling

1.2

0.7

V

EN Input Logic-High, Rising

1.7

1.4

V

EN Hysteresis

200

mV

TA = +25°C

1

EN, Input Current

VEN = 0V or 3.6V,

VDD = 3.6V

TA = +85°C

0.01

µA

SS

SS Charging Current

VSS = 0.45V

7

8

9

µA

SS Discharge Resistance

500

Ω

THERMAL SHUTDOWN

Thermal-Shutdown Threshold

+165

°C

Thermal-Shutdown Hysteresis

20

°C

POWER-GOOD (PWRGD)

Power-Good Threshold Voltage

VFB falling, 3mV hysteresis

87

90

93

%

Power-Good Falling-Edge Deglitch

48

Clock

cycles

PWRGD Output-Voltage Low

IPWRGD = 4mA

0.03

0.15

V

PWRGD Leakage Current

VDD = VPWRGD = 3.6V, VFB = 0.9V

0.01

µA

OVERCURRENT LIMIT

Current-Limit Startup Blanking

128

Clock

cycles

Restart Time

1024

Clock

cycles

Note 2: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by

design and characterization.

Note 3: Guaranteed by design.

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VDD = 3.3V, VFB = 0.5V, TA = -40°C to +85°C. Typical values are at TA = +25°C, circuit of Figure 1, unless otherwise noted.) (Note 2)

Typical Operating Characteristics

(Typical values are at VIN = VDD = 3.3V, VOUT = 1.8V, RFREQ = 50kΩ, IOUT = 3A, and TA = +25°C, unless otherwise noted.)

EFFICIENCY vs. OUTPUT CURRENT

OUTPUT CURRENT (A)

40

50

60

80

70

90

100

0.1

1

10

VOUT = 1.8V

VOUT = 2.5V

VIN = VDD = 3.3V

VOUT = 1.2V

EFFICIENCY vs. OUTPUT CURRENT

OUTPUT CURRENT (A)

60

65

75

70

80

85

90

95

100

0.1

1

10

VOUT = 1.5V

VOUT = 1.88V

VIN = VDD = 2.5V

VOUT = 1.2V

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