Rainbow Electronics MAX1745 - Manual (Page 4)

MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(VIN = SHDN = 5.5V to 36V, 3/5 = GND, ILOAD = 0, TA = -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS MIN MAX UNITS
Input Voltage Range 4.5 36 V
Supply Current into IN SHDN = V
IN = 5.5V to 36V 140 µA
Shutdown Supply Current SHDN = GND 15 µA
3/5 = VL 4.85 5.15
Output Voltage (MAX1744)
3/5 = GND 3.20 3.40
V
OUT Input Current (MAX1744) 3/5 = VL, V OUT = 5V 44 µA
FB Threshold Voltage (MAX1745) Falling edge, hysteresis = 8mV 1.22 1.28 V
FB Input Current (MAX1745) -50 50 nA
VH Output Voltage with Respect to IN V IN = 5.5V to 36V, I VH = 100µA to 20mA -6.0V -4.3V V
VL Output Voltage V IN = 5.5V to 36V, I VL = 100µA to 2mA 4.5 5.5 V
VL Undervoltage Lockout 1.6 4.1 V
V CS = V OUT = 2.5V to 18V 85 115
CS Threshold Voltage
V CS = V OUT = GND 80 150
mV
V CS = V OUT = 2.5V to 18V 0 25
CS Input Current
V
CS
= V
OUT
= GND -25 0
µA
SHDN, 3/5 Logic-High Threshold V IN = 4.5V to 36V 2.4 V
SHDN, 3/5 Logic-Low Threshold V IN = 4.5V to 36V 0.4 V
3/5 Input Current SHDN = GND ±1 µA
3/5 = GND ±1
SHDN Input Current
SHDN = 36V 12
µA
EXT Resistance 20 Ω
Minimum EXT Off-Time 1.5 2.5 µs
Minimum EXT On-Time 0.7 1.5 µs
Reference Voltage I REF = 0 1.22 1.28 V
REF Load Regulation 0 ≤ I
REF
≤ 100µA 10 mV
REF Line Regulation V IN = 4.5V to 36V, I REF = 0 80 µV/V
Note 1: Specifications to -40°C are guaranteed by design, not production tested.