Rainbow-electronics MAX1554 Bedienungsanleitung PDF herunterladen (Seite 2)

MAX1553/MAX1554

High-Efficiency, 40V Step-Up

Converters for 2 to 10 White LEDs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= 3.3V, V

= 0V, C

OUT

= 1µF, R

SENSE

= 10Ω, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

, FB, OV to GND..............................................-0.3V to +6.0V

LX to GND ..............................................................-0.3V to +45V

EN, BRT, SS to GND...................................-0.3V to (V

+ 0.3V)

...................................................................................0.9A

RMS

Continuous Power Dissipation (T

= +70°C)

8-Pin 3mm x 3mm TDFN

(derate 24.4mW/°C above +70°C).............................1951mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

MAX1553 2.7 5.5

Supply Voltage

MAX1554 3.15 5.50

Undervoltage Lockout Threshold V

rising or falling, 35mV hysteresis typical 2.35 2.5 2.65 V

Not switching 0.33 0.65

Quiescent Current

Switching 0.44 0.9

= +25°C 0.1 1

Shutdown Supply Current V

= 0V

= +85°C1

µA

OV Threshold Rising edge 1.18 1.25 1.33 V

= +25°C 1 200

OV Input Bias Current V

= 1V

= +85°C10

BRT Input Resistance 0 < V

BRT

< 1.5V, EN = V

200 400 600 kΩ

TIMING CONTROL

Maximum On-Time V

= 3.3V 2.0 3.4 4.8 µs

On-Time Constant (K) t

= K / V

6.3 µs-V

Minimum Off-Time 150 250 350 ns

ERROR AMPLIFIER

BRT

= 1.25V 192 203 212

FB Threshold

BRT

= 3.3V 280

= +25°C 15 200

FB Input Bias Current V

= 1.0V

= +85°C 100

N-CHANNEL SWITCH

LX On-Resistance 0.8 1.4 Ω

1 2 3 4 5 6 7 ... 10 11

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