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
SYMBOL
CONDITIONS
MIN
MAX UNITS
INPUTS AND OUTPUTS
EN Logic-Input Threshold
VEN EN rising edge; hysteresis = 450mV (typ)
1.20
2.20
V
SKIP Quad-Level Input Logic
Levels
VSKIP
High (5V VDD)
Mid (3.3V)
Ref (2.0V)
VCC -
0.4
3.0
1.7
3.6
V
2.3
Low (GND)
0.4
Note 1: Limits are 100% production tested at TA = +25°C. Maximum and minimum limits over temperature are guaranteed by
design and characterization.
Note 2: The 0 to 0.5V range is guaranteed by design, not production tested.
Note 3: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, VBST = 5V,
and a 250pF capacitor connected from DH to LX. Actual in-circuit times can differ due to MOSFET switching speeds.
Typical Operating Characteristics
(MAX8792 Circuit of Figure 1, VIN = 12V, VDD = 5V, SKIP = GND, RTON = 200kΩ, TA = +25°C, unless otherwise noted.)
100
90
80
70
60
50
40
30
20
0.01
1.5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
7V
12V
20V
SKIP MODE
PWM MODE
0.1
1
10
LOAD CURRENT (A)
1.5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
100
SKIP MODE
90
80
70
60
50
LOW-NOISE
40
MODE
30
PWM MODE
20
0.01
0.1
1
10
LOAD CURRENT (A)
1.5V OUTPUT VOLTAGE
vs. LOAD CURRENT
1.54
LOW-NOISE
1.52
MODE
SKIP MODE
1.50
PWM MODE
1.48
0
2
4
6
8
10
LOAD CURRENT (A)
6 _______________________________________________________________________________________
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