MAX618_09 datasheet(2/14 Pages) MAXIM

2 / 14 page

28V, PWM, Step-Up DC-DC Converter

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = +6V, PGND = GND, CVL = 4.7µF, 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.

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

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

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

SHDN, COMP, FB to GND ............................-0.3V to (VL + 0.3V)

PGND to GND.....................................................................±0.3V

Continuous Power Dissipation (TA = +70°C) (Note 1)

16-Pin QSOP (derate 15mW/°C above +70°C)...................1W

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

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

Storage Temperature Range .............................-65°C to +150°C

Soldering Temperature (reflow) .......................................+260°C

Note 1: With part mounted on 0.9 in.2 of copper.

Shutdown Supply Current

IIN

µA

VIN = 28V, VFB = 1.6V, SHDN = GND

Maximum Duty Cycle

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

VL Output Voltage

VVL

2.9

3.05

3.2

Supply Current, Full Load

IIN

2.5

3.5

Supply Current, Full Load, VL

Connected to IN

IIN

6.5

VL Load Regulation

∆VVL

VL Undervoltage Lockout

2.58

2.7

2.8

FB Set Voltage

VFB

1.47

1.5

1.53

FB Input Bias Current

IFB

150

Supply Current, No Load

Input Voltage

VIN

328

IIN

500

700

µA

Line Regulation

∆VOUT

0.01

0.08

%/V

Load Regulation

∆VOUT

0.2

LX Voltage

VLX

LX Switch Current Limit

ILXON

1.7

2.2

2.7

Idle Mode Current-Limit

Threshold

0.25

0.35

0.45

LX On-Resistance

RLXON

0.3

0.6

Ω

LX Leakage Current

ILXOFF

0.02

µA

COMP Maximum Output Current

ICOMP

100

200

µA

COMP Current vs. FB Voltage

Transconductance

0.8

mmho

SHDN Input Logic Low

VIL

0.8

SHDN Input Logic High

VIH

2.0

Shutdown Input Current

µA

Switching Frequency

200

250

300

kHz

CONDITIONS

VIN = 3V to 6V, VOUT = 12V

VIN = 3.5V or 28V, no load

VOUT = 12V, ILOAD = 10mA to 500mA

VIN = 3.4V to 28V, VFB = 1.4V, SHDN = VL,

VVL < VIN

VIN = 3V to 5.5V, VFB = 1.4V, SHDN = VL = IN

ILOAD = 0 to 2mA, VFB = 1.6V

Rising edge, 1% hysteresis

PWM mode

VFB = 1.6V

VLX = 28V

FB = GND

VIN = 3V to 28V, VFB = 1.6V, SHDN = VL

∆FB = 0.1V

SHDN = GND or VL

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