MAX629ESA datasheet(2/12 Pages) MAXIM

2 / 12 page

28V, Low-Power, High-Voltage,

Boost or Inverting DC-DC Converter

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC = +5V, CREF = 0.1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note1)

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.

Supply Voltage (VCC to GND) ..................................-0.3V to +6V

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

ISET, REF, FB, POL to GND .......................-0.3V to (VCC + 0.3V)

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

Continuous Power Dissipation (TA = +70°C)

SO (derate 5.88mW/°C above +70°C) ..........................471mW

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

CONDITIONS

2.7

5.5

VCC Input Voltage (Note 2)

UNITS

MIN

TYP

MAX

PARAMETER

VFB = 1.3V

µA

120

VCC Supply Current

100mV hysteresis

2.3

2.5

2.65

VCC Undervoltage Lockout

SHDN = GND

µA

0.04

VCC Shutdown Current

0.39

0.45

0.51

Circuit of Figure 2

VLX = 28V, TA = +85°C

µA

0.05

2.5

LX Leakage Current

POL = GND

µs

0.7

1.0

1.3

Minimum LX Off-Time

µs

6.5

8.5

10.0

Maximum LX On-Time

0.20

0.25

0.33

LX Switch-Current Limit

Positive Output Voltage

POL = GND, VFB < 1V

3.0

4.5

6.0

POL = VCC

2.0

3.2

3.8

POL = GND

(positive output)

1.218

1.282

1.225

1.250

1.275

FB Input Bias Current

1.225

1.250

1.275

VCC = 5V

Ω

0.6

1.2

VCC = 3.3V

0.7

1.4

LX On-Resistance

TA = 0°C to +85°C

TA = -40°C to +85°C

TA = 0°C to +85°C

TA = -40°C to +85°C

POL = VCC

(negative output)

-25

FB Set Point

-15

VCC = 2.7V to 5.5V,

no load on REF

1.218

1.282

REF Output Voltage

TA = 0°C to +85°C

TA = -40°C to +85°C

VIH

2.4

SHDN, POL, ISET Logic Levels

VIL

0.4

Voltage applied to L1 (VIN)

0.8

VOUT

Input Supply Voltage (Note 2)

Circuit of Figure 3

VIN

-28

Negative Output Voltage

ISET = VCC

ISET = GND

POL = VCC, VFB > 0.25V

3.0

4.5

6.0

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