Rainbow Electronics MAX17101 - Manual (Page 4)

MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
4 _______________________________________________________________________________________
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
LDO Short-Circuit Current I ILIM(LDO) LDO = GND 100 260 mA
LDO Regulation Reduction/
Bypass Switchover Threshold With respect to the LDO voltage,
falling edge of BYP
-11.0 -8.5 -6.0 %
LDO Bypass Switchover
Threshold With respect to the LDO voltage,
rising edge of BYP
-6.5 %
LDO Bypass Switchover
Startup Timeout
t BYP
Rising edge of BYP to bypass gate pulled
low
500 μs
LDO Bypass Switch Resistance LDO to BYP, V BYP = 5V (Note 4) 1.2 4.5
Falling edge of V CC ,
PWM disabled below this threshold
3.8 4.0 4.3 V
CC
Undervoltage-Lockout
(UVLO) Threshold
V UVLO(VCC)
Rising edge of V CC 4.2
V
Thermal-Shutdown Threshold T SHDN Hysteresis = 10°C +160 °C
3.3V ALWAYS-ON LINEAR REGULATOR (RTC)
ON1 = ON2 = GND, V IN = 6V to 24V,
0 < I RTC < 5mA
3.23 3.33 3.43
RTC Output-Voltage Accuracy V
RTC
ON1 = ON2 = ONLDO = GND,
V
IN = 6V to 24V, 0 < I RTC < 5mA
3.16 3.50
V
RTC Short-Circuit Current I ILIM(RTC) RTC = GND 5 mA
REFERENCE (REF)
Reference Voltage V REF V CC = 4.5V to 5.5V, I REF = 0 1.980 2.00 2.020 V
Reference Load Regulation V REF I REF = -20μA to +50μA -10 +10 mV
REF Lockout Voltage V REF(UVLO) Rising edge, 350mV (typ) hysteresis 1.95 V
OUT1 FAULT DETECTION
OUT1 Overvoltage Trip
Threshold
V OVP(OUT1) With respect to error-comparator threshold 12 16 20 %
OUT1 Overvoltage
Fault-Propagation Delay
t OVP FB1 forced 50mV above trip threshold 10 μs
OUT1 Undervoltage Protection
Trip Threshold
V
UVP(OUT1)
With respect to error-comparator threshold 65 70 75 %
OUT1 Output-Undervoltage
Fault-Propagation Delay
t UVP 10 μs
PGOOD1 Lower Trip Threshold
With respect to error-comparator threshold,
falling edge, hysteresis = 1%
-20 -16 -12 %
PGOOD1 Propagation Delay t PGOOD1
FB1 forced 50mV beyond PGOOD1 trip
threshold, falling edge
10 μs
PGOOD1 Output Low Voltage
V FB1 = 0.56V (PGOOD1 low impedance),
I SINK = 4mA
0.3 V
PGOOD1 Leakage Current I PGOOD1
V FB1 = 0.70V (PGOOD1 high impedance),
PGOOD1 forced to 5.5V
1 μA