Rainbow-electronics MAX1745 Uživatelský manuál stáhnout pdf (Strana 4)

MAX1744/MAX1745

High-Voltage, Step-Down DC-DC

Controller in µMAX

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

= SHDN = 5.5V to 36V, 3/5 = GND, I

LOAD

= 0, T

= -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

= 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

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

= 5.5V to 36V, I

= 100µA to 20mA -6.0V -4.3V V

VL Output Voltage V

= 5.5V to 36V, I

= 100µA to 2mA 4.5 5.5 V

VL Undervoltage Lockout 1.6 4.1 V

= V

OUT

= 2.5V to 18V 85 115

CS Threshold Voltage

= V

OUT

= GND 80 150

= V

OUT

= 2.5V to 18V 0 25

CS Input Current

= V

OUT

= GND -25 0

µA

SHDN, 3/5 Logic-High Threshold V

= 4.5V to 36V 2.4 V

SHDN, 3/5 Logic-Low Threshold V

= 4.5V to 36V 0.4 V

3/5 Input Current SHDN = GND ±1µA

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

= 4.5V to 36V, I

REF

= 0 80 µV/V

Note 1: Specifications to -40°C are guaranteed by design, not production tested.

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MAX1744/MAX1745 1
Controller in µMAX 1

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