MAX1677 datasheet(2/16 Pages) MAXIM

2 / 16 page

Compact, High-Efficiency, Dual-Output

Step-Up and LCD Bias DC-DC Converter

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VOUT = 3.3V, CREF = 0.1µF, POUT = OUT, 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.

OUT, LCDON, ON, POUT, LBI,

LBO,

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

CLK/SEL, LCDPOL, REF, LCDFB,

FB to GND .............................................-0.3V to (VOUT + 0.3V)

LCDLX to GND .......................................................-0.3V to +30V

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

POUT to OUT.........................................................-0.3V to +0.3V

Continuous Power Dissipation (TA = +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........696mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

GENERAL

Input Voltage Range

VIN

(Note 1)

0.7

5.5

Minimum Startup Voltage

VSTARTUP

TA = +25°C, ILOAD < 1mA

0.9

1.1

Reference Voltage

VREF

IREF = 0

1.23

1.25

1.27

Reference Load Regulation

IREF = 0 to 50µA (Note 2)

Reference Line Rejection

VOUT = 2.5V to 5.5V

0.2

Supply Current

Main DC On, LCD Off

ILCDOFF

No load, current into OUT

µA

Supply Current All On,

Main DC-DC in PFM Mode

IPFM

No load, current into OUT

µA

Supply Current All On,

Main DC-DC in PWM Mode

IPWM

No load, current into OUT

115

300

µA

Supply Current in Shutdown

0.3

µA

MAIN BOOST DC-DC

Output Voltage

VOUT

FB = GND, 0

≤ ILX ≤ 350mA,

CLK/SEL = OUT (Note 3)

3.20

3.30

3.43

FB Regulation Voltage

VFB (REG)

Adjustable mode, CLK/SEL = OUT (Note 3)

1.225

1.25

1.275

FB Input Current

IFB

VFB = 1.3V

0.02

Output Voltage Adjustment

Range

2.5

5.5

Startup to Normal Mode

Transition Voltage (Note 4)

VLOCKOUT

2.1

2.4

Line Regulation

IOUT = 150mA, VIN = 2V to 3V

0.6

Load Regulation

CLK/SEL = OUT, VIN = 2.4V,

ILOAD = 10mA to 200mA

Frequency in Startup Mode

fSTARTUP

VOUT = 15V

300

kHz

LX Leakage Current

ILX (LEAK)

0.2

µA

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