Rainbow-electronics MAX1845 Manual de usuario descargar pdf (Pagina 4)

MAX1845

Dual, High-Efficiency, Step-Down

Controller with Accurate Current Limit

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

= V

= 5V, SKIP = GND, V+ = 15V, T

= 0°C to +85°C, typical values are at +25°C, unless otherwise

noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

GND - V

, V

ILIM

_ = 0.5V 40 50 60

Current-Limit Threshold

(Adjustable)

GND - V

, V

ILIM

_ = 1V 85 100

115

ILIM_ Adjustment Range

ILIM

0.3 2.5 V

Negative Current-Limit Threshold

(Fixed)

CS_ = GND, ILIM_ = V

, T

= +25

C -75 -60

-45

Thermal Shutdown Threshold Hysteresis = 15

C 160

Undervoltage Lockout

Threshold

Rising edge, hysteresis = 20mV, PWMs

disabled below this level

4.05

4.4 V

DH_ Gate Driver On-Resistance V

BST

_ = V

_ = 5V 1.5 5 Ω

DL_ Gate Driver On-Resistance

(Pullup)

DL_, high state 1.5 5 Ω

DL_ Gate Driver On-Resistance

(Pulldown)

DL_, low state 0.5 1.7 Ω

DH_ Gate Driver Source/Sink

Current

_ = 2.5V, V

BST

_ = V

_ = 5V 1 A

DL_ Gate Driver Sink Current V

_ = 2.5V 3 A

DL_ Gate Driver Source Current V

_ = 2.5V 1 A

ON_, SKIP 2.4

Logic Input High Voltage V

UVP

0.4

ON_, SKIP 0.8

Logic Input Low Voltage V

UVP

0.05

TON Threshold TON

0.4

Float level

3.15 3.85

REF level

1.65 2.35

TON

GND level 0.5

Logic Input Current TON (GND or V

)-33µA

Logic Input Current ON_, SKIP, UVP -1 1 µA

PGOOD Trip Threshold (Lower)

With respect to error-comparator trip

threshold, falling edge

-12.5

-10

-7.5

PGOOD Trip Threshold (Upper)

With respect to error-comparator trip

threshold, rising edge

+7.5 +10 +12.5

PGOOD Propagation Delay

Falling edge, FB_ forced 2% below PGOOD

trip threshold

1.5 µs

PGOOD Output Low Voltage I

SINK

= 1mA 0.4 V

PGOOD Leakage Current High state, forced to 5.5V 1 µA

1 2 3 4 5 6 7 8 9 ... 23 24

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Rainbow-electronics MAX1845 Manual de usuario Pagina 4

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