MAX8792 查看數據表（PDF） - Maxim Integrated
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MAX8792 Datasheet PDF : 28 Pages
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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 = -40°C to +85°C, unless otherwise
specified.) (Note 1)
PARAMETER
Minimum Off-Time
REFIN Voltage Range
FB Voltage Range
FB Voltage Accuracy
REFERENCE
Reference Voltage
FAULT DETECTION
SYMBOL
tOFF(MIN)
VREFIN
VFB
VFB
CONDITIONS
(Note 3)
(Note 2)
(Note 2)
Measured at FB,
VIN = 2V to 26V,
SKIP = VDD
VREFIN = 0.5V
VREFIN = 1.0V
VREFIN = 2.0V
VREF VCC = 4.5V to 5.5V
MIN
0
0
0.49
0.99
1.985
1.985
MAX
350
VREF
VREF
0.51
1.01
2.015
UNITS
ns
V
V
V
2.015
V
Output Overvoltage-Protection
Trip Threshold
With respect to the internal target voltage
OVP (error comparator threshold); rising edge;
250
hysteresis = 50mV
350
mV
Output Undervoltage-Protection
Trip Threshold
With respect to the internal target voltage
UVP (error comparator threshold);
falling edge; hysteresis = 50mV
-240
-160
mV
Output Undervoltage
Fault-Propagation Delay
PGOOD Output Low Voltage
VCC Undervoltage Lockout
Threshold
CURRENT LIMIT
ILIM Input Range
Current-Limit Threshold
Ultrasonic Frequency
GATE DRIVERS
DH Gate Driver On-Resistance
DL Gate Driver On-Resistance
Internal BST Switch On-Resistance
tUVP FB forced 25mV below trip threshold
ISINK = 3mA
V U V L O( V C C )
Rising edge, PWM disabled below this level;
hysteresis = 100mV
VILIMIT
VILIM = 0.4V
ILIM = REF (2.0V)
SKIP = open (3.3V); VFB = VREFIN + 50mV
RON(DH)
RON(DL)
RBST
BST - LX forced Low state (pulldown)
to 5V
High state (pullup)
High state (pullup)
Low state (pulldown)
IBST = 10mA, VDD = 5V
80
3.95
0.4
17
90
17
400
μs
0.4
V
4.45
V
VREF
V
23
mV
110
kHz
3.5
Ω
3.5
4
Ω
2
7
Ω
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