MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LINEAR REGULATOR (LDO5)
LDO5 Output-Voltage Accuracy V
LDO5
V
IN
= 6V to 24V, ON1 = GND,
0 < I
LDO5
< 100mA
4.90 5.0 5.10 V
LDO5 Short-Circuit Current LDO5 = GND 100 260 mA
Falling edge of OUT1 -11.0 -8.8 -6.0
LDO5 Regulation Reduction/
Bootstrap Switchover Threshold
Rising edge of OUT1 -7.0
%
LDO5 Bootstrap Switch Resistance LDO5 to OUT1, V
OUT1
= 5V (Note 3) 1.9 4.5
Falling edge of V
CC
, PWM disabled
below this threshold
3.8 4.0 4.3
V
CC
Undervoltage Lockout
Threshold
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
3.19 3.47
V
RTC Short-Circuit Current RTC = GND 5 22 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 Error 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 and PGOOD
Trip Threshold
With respect to error comparator threshold 10 13 16 %
OUT1 Overvoltage Fault
Propagation Dela y
t
OVP
OUT1 forced 50mV above trip threshold 10 µs
OUT1 Undervoltage Protection
Trip Threshold
With respect to error comparator threshold 65 70 75 %
OUT1 Output Undervoltage
Fault Propagation Delay
t
UVP
10 µs
OUT2 FAULT DETECTION
OUT2 Overvoltage and PGOOD
Trip Threshold
With respect to error comparator threshold 10 13 16 %
OUT2 Overvoltage Fault
Propagation Dela y
t
OVP
OUT2 forced 50mV above trip threshold 10 µs
OUT2 Undervoltage Protection
Trip Threshold
With respect to error comparator threshold 65 70 75 %
OUT2 Output Undervoltage Fault
Propagation Dela y
t
UVP
10 µs
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, V
IN
= 12V, V
DD
= V
CC
= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(17 Seiten)
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