MAX1561ETA datasheet(2/10 Pages) MAXIM

2 / 10 page

High-Efficiency, 26V Step-Up Converters

for Two to Six White LEDs

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = 3V, VOUT = 20V, COUT = 0.1µF, CCOMP = 0.15µF, RSENSE = 7.5

Ω, VCTRL = 1.5V, Figure 1, TA = 0°C to +85°C, unless other-

wise 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.

IN to GND .................................................................-0.3V to +6V

PGND to GND .......................................................-0.3V to +0.3V

LX, OUT to GND .....................................................-0.3V to +30V

CTRL to GND...................-0.3V to the lower of +6V or (VIN + 2V)

COMP, CS to GND.........................................-0.3 to (VIN + 0.3V)

ILX.............................................................................................1A

Continuous Power Dissipation (TA = +70°C)

3mm x 3mm 8-Pin TDFN

(derate 24.4mW/°C above +70°C) .............................1950mW

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

Supply Voltage

2.6

5.5

UVLO Threshold

VIN rising or falling

2.10

2.38

2.55

UVLO Hysteresis

Quiescent Current

No switching

0.38

0.55

TA = +25

°C

0.3

Shutdown Supply Current

CTRL = GND, VOUT = VIN

TA = +85

°C1

µA

OVLO Threshold

VOUT rising

OVLO Hysteresis

VOUT = 26V, VCTRL > 0.24V

OUT Input Bias Current

VOUT = VIN, CTRL = GND

0.01

µA

Output Voltage Range

(Note 1)

(VIN - VD1)

25.5

ERROR AMPLIFIER

CTRL to CS Regulation

VCTRL = 1V, VIN = 2.6V to 5.5V

0.095

0.100

0.105

TA = +25

°C

0.01

CS Input Bias Current

VCS = VCTRL/10

TA = +85

°C

0.03

µA

CTRL Input Resistance

VCTRL

≤ 1.0V

290

500

780

Ω

CTRL Dual-Mode Threshold

100

170

240

CTRL Dual-Mode Hysteresis

5mV

MAX1561

6.5

8.2

10.5

CTRL Shutdown Enable Delay

(Note 2)

MAX1599

13.6

16.4

21.0

CS-to-COMP Transconductance

VCOMP = 1.0V

µS

OSCILLATOR

MAX1561

0.80

1.0

1.25

Operating Frequency

MAX1599

0.4

0.5

0.6

MHz

PWM mode

Minimum Duty Cycle

Pulse skipping

Maximum Duty Cycle

CTRL = IN, CS = GND

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