MAX8778 Просмотр технического описания (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 = -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
LINEAR REGULATOR (LDO)
LDO Output-Voltage Accuracy
LDOREFIN Input Range
LDOREFIN Dual-Mode
Threshold Voltage
VLDO
VLDOREFIN
VIN = 24V, LDOREFIN = BYP = GND,
0mA < ILDO < 100mA
VIN = 24V, LDOREFIN = VCC, BYP = GND,
0mA < ILDO < 100mA
VIN = 24V, BYP = GND, VLDOREFIN = 0.5V,
0mA < ILDO < 100mA
VLDO = 2x VLDOREFIN
LDOREFIN low threshold
LDOREFIN high threshold
4.85
3.20
0.960
0.3
0.10
VCC -
2V
5.15
3.40
V
1.040
2.0
V
0.25
VCC -
V
0.9V
LDO Short-Circuit Current
IILIM(LDO) LDO = GND
LDO Regulation Reduction/
Falling edge of BYP
-12
Bypass Switchover Threshold
VCC Undervoltage-Lockout
Threshold
VUVLO(VCC)
Falling edge of VCC,
PWM disabled below this threshold
3.8
260
mA
-5
%
4.3
V
3.3V ALWAYS-ON LINEAR REGULATOR (RTC)
RTC Output-Voltage Accuracy
RTC Short-Circuit Current
REFERENCE (REF)
VRTC
IILIM(RTC)
ON1 = ON2 = GND, VIN = 6V to 24V,
0 < IRTC < 5mA
ON1 = ON2 = ONLDO = GND,
VIN = 6V to 24V, 0 < IRTC < 5mA
RTC = GND
3.18
3.16
5
3.45
V
3.50
30
mA
Reference Voltage
Reference Load-Regulation Error
OUT1 FAULT DETECTION
VREF
VREF
VCC = 4.5V to 5.5V, IREF = 0
IREF = -20µA to 50µA
1.975
-10
2.025
V
+10
mV
OUT1 Overvoltage Trip
Threshold
VOVP(OUT1) With respect to error-comparator threshold
12
20
%
OUT1 Undervoltage-Protection
Trip Threshold
VUVP(OUT1) With respect to error-comparator threshold
63
77
%
PGOOD1 Lower Trip Threshold
With respect to error-comparator threshold,
falling edge, hysteresis = 1%
-20
-12
%
PGOOD1 Output-Low Voltage
OUT2 FAULT DETECTION
VFB1 = 0.56V (PGOOD1 low impedance),
ISINK = 4mA
0.4
V
OUT2 Overvoltage Trip
Threshold
Preset mode (REFIN2 = RTC or VCC): with
12
VOVP(OUT2) respect to error-comparator threshold
Tracking mode: with respect to REFIN2 voltage 160
20
%
240
mV
8 _______________________________________________________________________________________
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