MAX158 datasheet(3/10 Pages) MAXIM

3 / 10 page

High-Efficiency, 26V Step-Up Converter

for White LED Main and Subdisplay Backlighting

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(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)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

N-CHANNEL SWITCH

LX On-Resistance

1.50

2.25

Ω

TA = +25

°C0.01

LX Leakage Current

VLX = +28V

TA = +85

°C0.02

µA

LX Current Limit

Duty cycle = 90%

450

650

950

MAIN AND SUBDISPLAY ON/OFF SWITCHES

OUT1 to OUT2 On-Resistance

EN1 = GND, EN2 = V+

2.5

Ω

OUT2 to CS On-Resistance

EN1 = V+, EN2 = GND

2.5

Ω

OUT1 to OUT2 Leakage Current

EN1 = EN2 = V+, VOUT1 = 25V, VOUT2 = +9V, TA = +85

°C

0.05

µA

OUT2 to CS Leakage Current

EN1 = EN2 = V+, VOUT2 = 12V, VCS = 0, TA = +85

°C0.05

µA

EN1 and EN2 Logic Input Voltage

High

+2.6V < VV+ < +5.5V

1.6

EN1 and EN2 Logic Input Voltage

Low

+2.6V < VV+ < +5.5V

0.6

TA = +25

°C0.02

EN1 and EN2 Input Leakage

VV+ = VEN1 = VEN2 = +5.5V

TA = +85

°C0.1

µA

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 =

-40°C to +85°C, unless otherwise noted.) (Notes 1, 3)

PARAMETER

CONDITIONS

MIN

MAX

UNITS

Supply Voltage

2.6

5.5

Undervoltage Lockout (UVLO)

Threshold

V+ rising or falling

2.10

2.55

Quiescent Current

No switching, VC = +0.25V

0.56

Overvoltage Lockout (OVLO)

Threshold

Rising

OUT1 Input Bias Current

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

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

0.093

0.107

CTRL Input Resistance

0 < VCTRL < +1.0V

290

780

Ω

CS to COMP Transconductance

VCOMP = 1.0V

µS

OSCILLATOR

Operating Frequency

0.75

1.30

MHz

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