MAX8743(2004) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8743
(Rev.:2004)

Dual, High-Efficiency, Step-Down Controller with High Impedance in Shutdown

Maxim Integrated 

Dual, High-Efficiency, Step-Down

Controller with High Impedance in Shutdown

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VDD = VCC = 5V, SKIP = AGND, V+ = 15V, TA = 0°C to +85°C, typical values are at +25°C, unless otherwise

noted.)

PARAMETER

Current-Limit Threshold (Fixed)

Current-Limit Threshold

(Adjustable)

ILIM_ Adjustment Range

Negative Current-Limit Threshold

(Fixed)

Thermal-Shutdown Threshold

VCC Undervoltage-Lockout

Threshold

DH Gate-Driver On-Resistance

DL Gate-Driver On-Resistance

DL Gate-Driver On-Resistance

DH_ Gate-Driver Source/Sink

Current

DL_ Gate-Driver Sink Current

DL_ Gate-Driver Source Current

Logic Input High Voltage

SYMBOL

CONDITIONS

AGND - VCS_, ILIM_ = VCC

AGND - VCS_, ILIM_ = 0.5V

AGND - VCS_, ILIM_ = 1V

VILIM_

VCS_ - AGND, ILIM_ = VCC, TA = +25 oC

Hysteresis = 15oC

Rising edge, hysteresis = 20mV, PWMs

disabled below this level

BST - LX forced to 5V MAX8743EEI

(Note 4)

MAX8743ETX

DL, high state

(Note 4)

MAX8743EEI

MAX8743ETX

DL, low state

(Note 4)

MAX8743EEI

MAX8743ETX

VDH_ = 2.5V, VBST_ = VLX_ = 5V

VDL_ = 2.5V

VDL_ = 2.5V

ON_, SKIP

VIH

UVP

Logic Input Low Voltage

ON_, SKIP

VIL

UVP

VCC level

TON Input Logic Level

Logic Input Current

Logic Input Current

PGOOD Trip Threshold (Lower)

Float level

REF level

AGND level

TON (AGND or VCC)

ON_, SKIP, UVP

With respect to error-comparator trip

threshold, falling edge

MIN

40

40

85

0.3

-75

4.05

2.4

VCC -

0.4

VCC -

0.4

3.15

1.65

-3

-1

-12.5

TYP

50

50

100

-60

+160

1.5

1.5

1.5

1.5

0.5

0.5

1

3

1

-10

MAX

60

60

115

2.5

UNITS

mV

mV

V

-45

mV

oC

4.40

V

5

Ω

6

Ω

5

Ω

6

Ω

1.7

Ω

2.7

Ω

A

A

A

V

0.8

V

0.05

3.85

V

2.35

0.5

+3

µA

+1

µA

-7.5

%

PGOOD Trip Threshold (Upper)

With respect to error-comparator trip

threshold, rising edge

+7.5 +10 +12.5 %

PGOOD Propagation Delay

PGOOD Output Low Voltage

PGOOD Leakage Current

Falling edge, FB_ forced 2% below PGOOD

trip threshold

ISINK = 1mA

High state, forced to 5.5V

1.5

µs

0.4

V

1

µA

4 _______________________________________________________________________________________

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