Rainbow-electronics MAX1698 Manual do Utilizador descarregar pdf (Página 3)

MAX1698

High-Efficiency Step-Up

Current Regulator for LEDs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS

= +3.3V, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

CONDITIONS

Supply Voltage 2.7 5.5

UNITSMIN MAXSYMBOLPARAMETER

CS Trip Current FB = GND 0.8 3.0 A

Minimum Off Time t

OFF(MIN)

FB = GND, ADJ = REF 0.6 1.4 µs

Maximum On Time t

ON(MAX)

FB = GND, ADJ = REF, CS = GND 921µs

ADJ Start Threshold 25 75 mV

FB Input Bias Current I

= 300mV -20 20 nA

ADJ Input Bias Current I

ADJ

ADJ = REF -50 50 nA

Shutdown Supply Current

SHDN = GND

1 µA

REF Output Voltage V

REF

= 0 1.17 1.33 V

REF Load Regulation ∆V

REF

= 0 to 150µA -30 mV

REF Short-Circuit Current REF = GND 1 mA

REF Power-Supply Rejection

Ratio

PSRR V

= 2.7V to 5.5V +2 mV/V

EXT On-Resistance V

= 5V 8 Ω

SHDN Input High Voltage

= 2.7V to 5.5V 2 V

SHDN Input Low Voltage

= 2.7V to 5.5V 0.8 V

SHDN Input Bias Current

SHDN

= 2.7V to 5.5V -1 1 µA

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

Rising edge VUndervoltage Lockout 2.20 2.65

ADJ

= 100mV

ADJ = REF

13 35

FB Regulation Voltage

280 320

= 0.3V µAI

Quiescent Supply Current 500

1 2 3 4 5 6 7 8

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