MAX8792 データシートの表示（PDF） - Maxim Integrated

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MAX8792

Single Quick-PWM Step-Down Controller with Dynamic REFIN

Maxim Integrated 

Single Quick-PWM Step-Down

Controller with Dynamic REFIN

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN = 12V, VDD = VCC = VEN = 5V, REFIN = ILIM = REF, SKIP = GND. TA = 0°C to +85°C, unless otherwise spec-

ified. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

FAULT DETECTION

Output Overvoltage-Protection

Trip Threshold

Output Overvoltage

Fault-Propagation Delay

SYMBOL

CONDITIONS

OVP

tOVP

With respect to the internal target voltage

(error comparator threshold); rising edge;

hysteresis = 50mV

Dynamic transition

Minimum OVP threshold

FB forced 25mV above trip threshold

MIN TYP MAX UNITS

250 300 350

mV

VREF +

0.30

V

0.7

5

μs

Output Undervoltage-Protection

Trip Threshold

With respect to the internal target voltage

UVP (error comparator threshold); falling edge;

-240 -200 -160

mV

hysteresis = 50mV

Output Undervoltage

Fault-Propagation Delay

tUVP FB forced 25mV below trip threshold

100 200 350

μs

UVP falling edge, 25mV overdrive

5

PGOOD Propagation Delay

tPGOOD OVP rising edge, 25mV overdrive

Startup delay

5

μs

100 200 350

PGOOD Output-Low Voltage

ISINK = 3mA

0.4

V

PGOOD Leakage Current

IPGOOD

FB = REFIN (PGOOD high impedance),

PGOOD forced to 5V, TA = +25°C

1

μA

Dynamic REFIN Transition Fault

Blanking Threshold

Fault blanking initiated; REFIN deviation

from the internal target voltage (error

±50

mV

comparator threshold); hysteresis = 10mV

Thermal-Shutdown Threshold

TSHDN Hysteresis = 15°C

160

°C

VCC Undervoltage Lockout

Threshold

VUVLO(VCC)

Rising edge, PWM disabled below this

level; hysteresis = 100mV

3.95 4.2 4.45

V

CURRENT LIMIT

ILIM Input Range

Current-Limit Threshold

VILIMIT

VILIM = 0.4V

ILIM = REF (2.0V)

0.4

VREF

V

18

20

22

mV

92

100 108

Current-Limit Threshold

(Negative)

VINEG VILIM = 0.4V

-24

mV

Current-Limit Threshold

(Zero Crossing)

VZX

VILIM = 0.4V,

VGND - VLX, SKIP = GND or open

1

mV

Ultrasonic Frequency

SKIP = open (3.3V); VFB = VREFIN + 50mV

18

30

kHz

Ultrasonic Current-Limit Threshold

SKIP = open (3.3V); VFB = VREFIN + 50mV

35

mV

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