Rainbow Electronics MAX17101 - Manual (Page 5)

MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, V IN = 12V, V DD = V CC = V SECFB = 5V, V REFIN2 = 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = V CC , T A = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUT2 FAULT DETECTION
With respect to error-comparator threshold 12 16 20 % OUT2 Overvoltage Trip
Threshold
V OVP(OUT2)
Minimum overvoltage threshold 0.7 V
OUT2 Overvoltage
Fault-Propagation Delay
t OVP OUT2 forced 50mV above trip threshold 10 μs
OUT2 Undervoltage Protection
Trip Threshold
V UVP(OUT2) With respect to error-comparator threshold 65 70 75 %
OUT2 Overvoltage
Fault-Propagation Delay
t OVP OUT2 forced 50mV above trip threshold 10 μs
OUT2 Output Undervoltage
Fault-Propagation Delay
t UVP OUT2 forced 50mV below trip threshold 10 μs
PGOOD2 Lower Trip Threshold
With respect to error-comparator threshold,
falling edge, hysteresis = 2%
-20 -16 -12 %
PGOOD2 Propagation Delay t PGOOD _
OUT2 forced 50mV beyond PGOOD1 trip
threshold, falling edge
10 μs
PGOOD2 Output-Low Voltage
V OUT2 = V REFIN2 - 150mV (PGOOD2 low
impedance), I
SINK
= 4mA
0.3 V
PGOOD2 Leakage Current I PGOOD _
OUT2 = REFIN2 (PGOOD2 high impedance),
PGOOD2 forced to 5.5V, T
A = +25°C
1 μA
CURRENT LIMIT
ILIM_ Adjustment Range V ILIM 0.2 2.0 V
ILIM_ Current I ILIM 5 μA
R ILIM _ = 100k 40 50 60 Valley Current-Limit Threshold
(Adjustable)
V VALLEY V AGND - V LX _
R ILIM _ = 200k 87 100 113
mV
Current-Limit Threshold
(Negative)
V NEG
With respect to valley current-limit threshold,
SKIP = V
CC
-120 %
Ultrasonic Current-Limit
Threshold
V NEG(US) V OUT1 = V OUT2 = V FB1 = 0.77V, V REFIN2 = 0.70V 25 mV
Current-Limit Threshold
(Zero Crossing)
V ZX V AGND - V LX _, SKIP = GND or OPEN/REF 1 mV