MAX685 datasheet(2/12 Pages) MAXIM

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Dual-Output (Positive and Negative),

DC-DC Converter for CCD and LCD

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD = VP = 5V, 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.

VDD, VP to GND........................................................-0.3V to +6V

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

VDD to VP...............................................................-0.3V to +0.3V

LXN, POK to GND ..................................................-0.3V to +30V

LXP to VDD..............................................................-15V to +0.3V

REF, SEQ, SHDN to GND...........................-0.3V to (VDD + 0.3V)

FBP, FBN, SYNC to GND .........................................-0.3V to +6V

Continuous Power Dissipation (TA = +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW

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

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

Storage Temperature Range .............................-65°C to +165°C

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

2.7V < VDD < 5.5V

VDD = 5.5V (Note 1)

No load

VDD = VP

No load

C3 = C4 = 10µF, ILOAD = 5mA

IOUT = 0 to 10mA, C1 = 10µF

VDD = rising

VDD = 4.5V to 5.5V

VFBP = 1.35V, VFBN = -0.1V

VDD = 4.5V, VOUT+ ≥ 14.25V, VOUT- ≤ -7.125V,

Figure 3

TA = +25°C

VDD = 4.5V

SYNC = SEQ = SHDN = GND

SYNC = VDD

CONDITIONS

µA

0.1

Input Bias Current

0.7 x VDD

Logic-High Input

0.3 x VDD

Logic-Low Input

µA

±0.01

±0.1

FBP, FBN Input Leakage Current

-16

FBN Threshold Voltage

1.21

1.24

1.27

FBP Threshold Voltage

UVLO Hysteresis

2.35

2.5

2.65

UVLO Threshold

µA

0.1

Shutdown Supply Current

-9

-1.27

Negative Output Voltage Range

2.7

5.5

Input Voltage Range

Positive Output Voltage Range

mVp-p

Output Voltage Ripple

%/mA

0.13

Load Regulation

%/V

0.2

Line Regulation

µA

300

500

Idle Quiescent Current

Output Current

440

LX Current Limit

Ω

0.6

LXP, LXN On-Resistance

0.8

Quiescent Current

UNITS

MIN

TYP

MAX

PARAMETER

0 < IREF < 50µA

No load

-2

VREF Load Regulation

1.23

1.250

1.27

VREF Output Voltage

SHUTDOWN (SHDN)

UNDERVOLTAGE LOCKOUT

REFERENCE VOLTAGE

FB INPUTS

LOGIC INPUTS (SEQ, SHDN, SYNC)

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