MAX1553_15 datasheet(2/10 Pages) MAXIM

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MAX1553/MAX1554

High-Efficiency, 40V Step-Up

Converters for 2 to 10 White LEDs

Maxim Integrated | 2

www.maximintegrated.com

Absolute Maximum Ratings

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

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

EN, BRT, SS to GND...................................-0.3V to (VCC + 0.3V)

ILX ...................................................................................0.9ARMS

Continuous Power Dissipation (TA = +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

Electrical Characteristics

(VCC = 3.3V, VOV = 0V, COUT = 1µF, RSENSE = 10

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

MAX1553

2.7

5.5

Supply Voltage

MAX1554

3.15

5.50

Undervoltage Lockout Threshold

VCC rising or falling, 35mV hysteresis typical

2.35

2.5

2.65

Not switching

0.33

0.65

Quiescent Current

Switching

0.44

0.9

TA = +25°C

0.1

Shutdown Supply Current

VEN = 0V

TA = +85°C

µA

OV Threshold

Rising edge

1.18

1.25

1.33

TA = +25°C

200

OV Input Bias Current

VOV = 1V

TA = +85°C

BRT Input Resistance

0 < VBRT < 1.5V, EN = VCC

200

400

600

TIMING CONTROL

Maximum On-Time

VCC = 3.3V

2.0

3.4

4.8

µs

On-Time Constant (K)

tON = K / VCC

6.3

µs-V

Minimum Off-Time

150

250

350

ERROR AMPLIFIER

VBRT = 1.25V

192

203

212

FB Threshold

VBRT = 3.3V

280

TA = +25°C

200

FB Input Bias Current

VFB = 1.0V

TA = +85°C

100

N-CHANNEL SWITCH

LX On-Resistance

0.8

1.4

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