Rainbow Electronics MAX1541 - Manual (Page 5)

MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
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ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, V CC = V DD = ON1 = ON2 = 5V, SKIP = GND, 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
REFERENCE (REF)
T A = + 25° C to + 85 ° C 1.986 2.00 2.014
Reference Voltage V REF
V CC = 4.5V to 5.5V,
I REF = 0V T A = 0° C to +85°C 1.983 2.00 2.017
V
Reference Load Regulation ∆V
REF I REF = -10µA to +50µA -0.01 +0.01 V
REF Lockout Voltage V REF(UVLO) Rising edge, hysteresis = 350mV 1.95 V
REFIN1 (MAX1541)
Voltage Range
V REFIN 0.7 V REF V
REFIN1 (MAX1541)
Input Bias Current
I REFIN1 0.01 0.05 µA
FAULT DETECTION
Overvoltage Trip Threshold
With respect to error-comparator threshold,
OVP/UVP = V
CC
12 16 20 %
Overvoltage Fault-Propagation
Delay
t OVP FB forced 2% above trip threshold 10 µs
Output Undervoltage-Protection
Trip Threshold With respect to error-comparator threshold,
OVP/UVP = V
CC
65 70 75 %
Output Undervoltage-Protection
Blanking Time
t BLANK From rising edge of ON_ 10 35 ms
Output Undervoltage Fault-
Propagation Delay
t UVP 10 µs
PGOOD_ Lower Trip Threshold
With respect to error-comparator threshold,
hysteresis = 1%
-13 -10 -7 %
PGOOD_ Upper Trip Threshold
With respect to error-comparator threshold,
hysteresis = 1%
+7 +10 +13 %
PGOOD_ Propagation Delay t PGOOD _ FB forced 2% beyond P GOOD _ trip threshold 10 µs
PGOOD_ Output Low Voltage I SINK = 4mA 0.3 V
PGOOD_ Leakage Current I
PGOOD
_
FB = REF (PGOOD high impedance),
PGOOD forced to 5.5V
1 µA
FBLANK = V CC 120 220 320
FBLANK = open 80 140 205
Fault-Blanking Time
(MAX1541 Only)
t FBLANK
FBLANK = REF 35 65 95
µs
LDOON = V CC +150
Thermal-Shutdown Threshold T SHDN Hysteresis = 10°C
LDOON = GND +160
°C
V CC Undervoltage-Lockout
Threshold
V UVLO(VCC)
Rising edge, PWM disabled below this
level, hysteresis = 20mV
4.1 4.25 4.4 V
CURRENT LIMIT
ILIM_ Adjustment Range 0.25 2 V
CSP_ 0 2.7
Current-Limit Input Range
CSN_ -0.3 +28
V
CSP_/CSN_ Input Current 0.5 µA