Rainbow-electronics MAX1677 Manual do Utilizador descarregar pdf (Página 2)

MAX1677

Compact, High-Efficiency, Dual-Output

Step-Up and LCD Bias DC-DC Converter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

OUT

= 3.3V, C

REF

= 0.1µF, POUT = OUT, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +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 (V

OUT

+ 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 (T

= +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 V

(Note 1) 0.7 5.5 V

Minimum Startup Voltage

STARTUP

= +25°C, I

LOAD

< 1mA 0.9 1.1 V

Reference Voltage V

REF

= 0

1.23 1.25 1.27

Reference Load Regulation I

REF

= 0 to 50µA (Note 2) 2 15 mV

Reference Line Rejection V

OUT

= 2.5V to 5.5V 0.2 5 mV

Supply Current

Main DC On, LCD Off

LCDOFF

No load, current into OUT 20 40 µA

Supply Current All On,

Main DC-DC in PFM Mode

PFM

No load, current into OUT 35 60 µA

Supply Current All On,

Main DC-DC in PWM Mode

PWM

No load, current into OUT

115 300

µA

Supply Current in Shutdown 0.3 5 µA

MAIN BOOST DC-DC

Output Voltage V

OUT

FB = GND, 0 ≤ I

≤ 350mA,

CLK/SEL = OUT (Note 3)

3.20 3.30 3.43

FB Regulation Voltage

(

REG

)

Adjustable mode, CLK/SEL = OUT (Note 3) 1.225 1.25 1.275

FB Input Current I

= 1.3V

0.02

50 nA

Output Voltage Adjustment

Range

2.5 5.5 V

Startup to Normal Mode

Transition Voltage (Note 4)

LOCKOUT

2.1 2.4 V

Line Regulation I

OUT

= 150mA, V

= 2V to 3V 0.6 %

Load Regulation

CLK/SEL = OUT, V

= 2.4V,

LOAD

= 10mA to 200mA

Frequency in Startup Mode

STARTUP

OUT

= 15V 40

300

kHz

LX Leakage Current

(

LEAK

)

0.2 5 µA

1 2 3 4 5 6 7 ... 15 16

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