MAX1553/MAX1554

High-Efficiency, 40V Step-Up

Converters for 2 to 10 White LEDs

Maxim Integrated | 2

www.maximintegrated.com

Absolute Maximum Ratings

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

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

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

V

Undervoltage Lockout Threshold

2.35

2.5

2.65

V

Not switching

0.33

0.65

Quiescent Current

Switching

0.44

0.9

mA

0.1

1

Shutdown Supply Current

1

µA

OV Threshold

Rising edge

1.18

1.25

1.33

V

1

200

OV Input Bias Current

10

nA

BRT Input Resistance

200

400

600

k

Ω

TIMING CONTROL

Maximum On-Time

2.0

3.4

4.8

µs

On-Time Constant (K)

6.3

µs-V

Minimum Off-Time

150

250

350

ns

ERROR AMPLIFIER

192

203

212

FB Threshold

280

mV

15

200

FB Input Bias Current

100

nA

N-CHANNEL SWITCH

LX On-Resistance

0.8

1.4

Ω