MAX685 datasheet(3/12 Pages) MAXIM

3 / 12 page

Dual-Output (Positive and Negative),

DC-DC Converter for CCD and LCD

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ELECTRICAL CHARACTERISTICS (continued)

(VDD = VP = 5V, TA = 0°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.)

ELECTRICAL CHARACTERISTICS

(VDD, VP = 5V, TA = -40°C to +85°C unless otherwise noted.) (Note 2)

Note 1: Negative output voltage can be larger magnitude for lower values of VDD. The voltage between VDD and VOUT- must not

exceed 14.5V.

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

VDD = 5.5V (Note 1)

VDD = VP

No load

VDD = rising

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

Figure 3

SYNC = GND

SYNC = SEQ = SHDN = GND

CONDITIONS

-9

-1.27

Negative Output Voltage Range

2.7

5.5

Input Voltage Range

Positive Output Voltage Range

1.205

1.275

FBP Threshold Voltage

2.35

2.65

UVLO Threshold

Maximum Output Current

µA

500

Idle Quiescent Current

µA

Shutdown Supply Current

UNITS

MIN

MAX

PARAMETER

CONDITIONS

SYNC = VDD

SYNC = GND

kHz

320

400

480

Oscillator Frequency (internal)

175

220

265

kHz

200

480

Sync Frequency Range (external)

IPOK = 2mA

FBN falling

FBP rising

0.4

POK Output Low Voltage

UNITS

MIN

TYP

MAX

108

PARAMETER

FBN POK Threshold

1.090

1.122

1.150

FBP POK Threshold

VPOK = 10V

µA

POK Output Off Current

2.7V < VDD ≤ 5.5V

No load

0.3 x VDD

Logic-Low Input

-20

FBN Threshold Voltage

2.7V < VDD ≤ 5.5V

0.7 x VDD

Logic-High Input

FBP rising

1.090

1.150

FBP POK Threshold

FBN falling

108

FBN POK Threshold

SYNC INPUT

POK COMPARATORS

No load

1.225

1.275

VREF Output Voltage

SHUTDOWN

UNDERVOLTAGE LOCKOUT

FB INPUTS AND REFERENCE VOLTAGE

LOGIC INPUTS (SEQ, SHDN, SYNC)

POK COMPARATORS

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