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 = -40°C to +85°C, unless otherwise noted.) (Note 5)

PARAMETER

Current-Limit Threshold

(Adjustable)

SYMBOL

CONDITIONS

AGND - VCS_, ILIM_ = 0.5V

AGND - VCS_, ILIM_ = 1V

MIN TYP MAX

35

65

80

120

VCC Undervoltage-Lockout

Threshold

Rising edge, hysteresis = 20mV, PWMs

disabled below this level

4.05

4.40

ON_, SKIP

2.4

Logic Input High Voltage

VIH

UVP

VCC -

0.4

ON_, SKIP

0.8

Logic Input Low Voltage

VIL

UVP

0.05

Logic Input Current

TON (AGND or VCC)

ON_, SKIP, UVP

-3

+3

-1

+1

UNITS

mV

V

V

V

µA

Note 2: When the inductor is in continuous conduction, the output voltage will have a DC regulation level higher than the error-compara-

tor threshold by 50% of the output voltage ripple. In discontinuous conduction (SKIP = AGND, light load), the output voltage

has a DC regulation higher than the error-comparator threshold by approximately 1.5% due to slope compensation.

Note 3: On-time and off-time specifications are measured from the 50% point to the 50% point at DH_ with LX_ = GND, BST_ = 5V,

and a 250pF capacitor connected from DH_ to LX_. Actual in-circuit times may differ due to MOSFET switching speeds.

Note 4: Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the QFN

package. The MAX8743EEI and MAX8743ETX contain the same die, and the QFN package imposes no additional resis-

tance in-circuit.

Note 5: Specifications to -40°C are guaranteed by design, not production tested.

__________________________________________Typical Operating Characteristics

(Circuit of Figure 1, components from Table 1, VIN = 15V, SKIP = GND, TON = unconnected, TA = +25°C, unless otherwise noted.)

FREQUENCY vs. LOAD CURRENT

400

350

OUT1, SKIP = VCC

300

250

OUT2, SKIP = VCC

200

OUT1, SKIP = GND

150

100

50

0

0.01

OUT2, SKIP = GND

0.1

1

10

LOAD CURRENT (A)

FREQUENCY vs. INPUT VOLTAGE

(TON = FLOAT, SKIP = VCC)

400

OUT1

350

300

250

OUT2

200

150

100

50

0

4

IOUT1 = 8A

IOUT2 = 4A

8

12

16

20

24

INPUT VOLTAGE (V)

6 _______________________________________________________________________________________

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