Rainbow-electronics MAX1639 Manual do Utilizador descarregar pdf (Página 3)

ELECTRICAL CHARACTERISTICS (continued)

= V

= +5V, PGND = AGND = 0V, FREQ = REF, T

= 0°C to +85°C, unless otherwise noted.)

MAX1639

_______________________________________________________________________________________

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

15 38 70

FB = 0V (foldback)

Current-Limit Trip Voltage

DL On-Resistance Ω

50 µABST = 12V, LX = 7V, REF = GNDBST Leakage Current

1536 1 / f

OSC

To full current limitSoft-Start Time

85 100 115FB = 1.1V

FB Input Current

CC2 Clamp Voltage

PARAMETER MIN TYP MAX UNITS

FREQ Input Current 4 µA

±0.1 µA

2.4 3.0

4 V

CC2 Source/Sink Current 100 µA

0.7 2DH On-Resistance

Maximum

0.7 2

Ω

DH, DL Source/Sink Current 2 A

DH, DL Dead Time 0 30 ns

CONDITIONS

Minimum

30mV overdrive

BST - LX = 4.5V

= 4.5V

DH = DL = 2.5V

ELECTRICAL CHARACTERISTICS

= V

= +5V, PGND = AGND = 0V, FREQ = REF, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

Note 1: Specifications from 0°C to -40°C are guaranteed by design, not production tested.

FREQ = REF

FREQ = V

BST - LX = 4.5V

FREQ = V

Falling FB, 1% hysteresis with respect to V

REF

Rising FB, 1% hysteresis with respect to V

REF

FREQ = AGND

= 4.5V

Ω2

%84

DL On-Resistance

rising edge, 1% hysteresis

Ω

= V

CONDITIONS

510 690

Maximum Duty Cycle

800 1200

DH On-Resistance

Switching Frequency

FB = 1.1VCurrent-Limit Trip Voltage mV70 130

6 10

kHz

240 360

-8 -4

PWROK Trip Level

V3.9 4.3Input Undervoltage Range

V4.5 5.5Input Voltage Range

UNITSMIN TYP MAXPARAMETER

CC2 Transconductance

CC1 Output Resistance 10 kΩ

1 mmho

CSH, CSL Input Current 50 µACSH = CSL = 1.1V

= V

5.5V

Supply Current

Includes line and load regulation errors

No load

V1.072 1.128FB Voltage

V3.448 3.553Reference Voltage

= V

= 5.5V, FB forced 60mV above

regulation point, operating or shutdown mode

mA0.2V

Supply Current

Operating mode FB overdrive = 60mV

VREF = 0VShutdown mode

1 2 3 4 5 6 7 8 ... 12 13

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