MAX158 datasheet(2/10 Pages) MAXIM

2 / 10 page

High-Efficiency, 26V Step-Up Converter

for White LED Main and Subdisplay Backlighting

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VV+ = +3.0V, VOUT1 = 20V, L1 = 22µH, COUT = 0.1µF, CCOMP = 0.022µF, RSENSE = 7.5

Ω, VCTRL = +1.5V, EN1 = EN2 = V+, TA =

0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

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.

V+, VP, CTRL to GND............................................-0.3V to +6.0V

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

LX, OUT1 to GND ...................................................-0.3V to +30V

OUT2 to GND .........................................................-0.3V to +14V

COMP, CS, EN1, EN2 to GND ....................-0.3V to (VV+ + 0.3V)

ILX ....................................................................................................1ARMS

Continuous Power Dissipation (TA = +70

°C)

12-Pin Thin QFN (derate 16.9mW/

°C above +70°C) ....1349mW

16-Pin UCSP (derate 6.5mW/

°C above +70°C)..............518mW

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

Undervoltage Lockout (UVLO)

Threshold

V+ rising or falling

2.10

2.38

2.55

UVLO Hysteresis

Quiescent Current

No switching, VCTRL = VCS = +0.25V

0.40

0.56

TA = +25

°C0.01

Shutdown Supply Current

EN1 = EN2 = GND, OUT1 = V+

TA = +85

°C0.1

µA

Overvoltage Lockout (OVLO)

Threshold

OVLO Hysteresis

VOUT1 = +26V, EN1 = EN2 = V+

TA = +25

°C0.01

OUT1 Input Bias Current

OUT1 = V+, EN1 = EN2 = GND

TA = +85

°C0.05

µA

Output Voltage Range

(Note 2)

(VV+ -

VDIODE)

25.5

ERROR AMPLIFIER

CTRL to CS Regulation

VCTRL = +1.0V, VV+ = +2.6V to +5.5V

0.095

0.100

0.106

TA = +25

°C0.01

CS Input Bias Current

VCS = VCTRL / 10

TA = +85

°C1

µA

CTRL Input Resistance

0 < VCTRL < +1V

290

500

780

Ω

CS to COMP Transconductance

VCOMP = +1.0V

µS

OSCILLATOR

Operating Frequency

0.80

1.0

1.25

MHz

PWM mode

Minimum Duty Cycle

Pulse skipping

Maximum Duty Cycle

CTRL = V+, CS = GND

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