MAX8778 데이터 시트보기 (PDF) - Maxim Integrated
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MAX8778 Datasheet PDF : 34 Pages
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Dual Quick-PWM Step-Down Controller
with Low-Power LDO, RTC Regulator
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN = 12V, VDD = VCC = VSECFB = 5V, VREFIN2 = 1.0V, BYP =
LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = VCC, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
(Note 3)
PARAMETER
OUT2 FAULT DETECTION
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
OUT2 Overvoltage Trip
Threshold
Preset mode (REFIN2 = RTC or VCC): with
respect to error-comparator threshold
13
16
19
%
VOVP(OUT2)
Dynamic transition,
SKIP = REF or VCC and OUT2 > REFIN2
VREF +
0.20
V
Tracking mode: with respect to REFIN2 voltage 170
200
230
mV
Minimum overvoltage threshold
0.7
V
OUT2 Overvoltage
Fault-Propagation Delay
tOVP OUT2 forced 50mV above trip threshold
10
µs
OUT2 Undervoltage-Protection
Trip Threshold
Preset mode: with respect to
VUVP(OUT2) error-comparator threshold
65
70
75
%
Tracking mode: with respect to REFIN2 voltage -250 -300 -350 mV
OUT2 Overvoltage
Fault-Propagation Delay
tOVP OUT2 forced 50mV above trip threshold
10
µs
OUT2 Output Undervoltage
Fault-Propagation Delay
tUVP OUT2 forced 50mV below trip threshold
10
µs
Dynamic REFIN2 Transition
PGOOD Blanking Threshold
Blanking initiated; REFIN2 deviation from the
internal target voltage (error-comparator
±25
mV
threshold); hysteresis = 5mV
PGOOD2 Lower Trip Threshold
Preset mode: with respect to error-comparator
threshold, falling edge, hysteresis = 1%
-19
-16
-13
%
Tracking mode: with respect to REFIN2
voltage, falling edge, hysteresis = 12mV
-175 -150 -125 mV
PGOOD2 Propagation Delay
tPGOOD2
OUT2 forced 50mV beyond PGOOD1 trip
threshold, falling edge
10
µs
PGOOD2 Output-Low Voltage
PGOOD2 Leakage Current
CURRENT LIMIT
IPGOOD2
VOUT2 = VREFIN2 - 150mV (PGOOD2 low
impedance), ISINK = 4mA
OUT2 = REFIN2 (PGOOD2 high impedance),
PGOOD2 forced to 5.5V, TA = +25°C
0.3
V
1
µA
ILIM_ Adjustment Range
VILIM
0.2
2.0
V
ILIM_ Current
IILIM
5
µA
Valley Current-Limit Threshold
(Adjustable)
VVALLEY VAGND - VLX_
RILIM_ = 100k
RILIM_ = 200k
RILIM_ = 400k
44
50
56
90
100
110
mV
180
200
220
Current-Limit Threshold
(Negative)
VNEG
With respect to valley current-limit threshold,
SKIP = VCC
-120
%
Ultrasonic Current-Limit Threshold VNEG(US) VOUT1 = VOUT2 = VFB1 = 0.77V, VREFIN2 = 0.70V
25
mV
Current-Limit Threshold
(Zero Crossing)
VZX
VAGND - VLX_, SKIP = GND or OPEN/REF
3
mV
_______________________________________________________________________________________ 5
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