MAX1896 datasheet(2/10 Pages) MAXIM

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1.4MHz SOT23 Current-Mode

Step-Up DC-DC Converter

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = VSHDN = 3V, FB = GND, SS = open, TA = 0°C to +85°C, unless otherwise noted.)

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.

LX to GND ..............................................................-0.3V to +14V

IN, SHDN, FB to GND...............................................-0.3V to +6V

SS to GND ...................................................-0.3V to (VIN + 0.3V)

RMS LX Pin Current ..............................................................0.6A

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

6-Pin SOT23 (derate 9.1mW/°C above +70°C)...........727mW

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

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

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

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Range

VIN

2.6

5.5

Output Voltage Adjust Range

VOUT

Circuit of Figure 1

VIN Undervoltage Lockout

UVLO

VIN rising, 50mV hysteresis

2.25

2.4

2.55

VFB = 1.3V, not switching

0.2

0.4

Quiescent Current

IIN

VFB = 1.0V, switching

V SHDN = 0, TA = +25°C

0.01

0.5

Shutdown Supply Current

V SHDN = 0

0.01

µA

ERROR AMPLIFIER

Feedback Regulation Set Point

VFB

1.2

1.24

1.25

FB Input Bias Current

IFB

VFB = 1.24V

Line Regulation

2.6V < VIN < 5.5V

0.05

0.20

%/V

OSCILLATOR

Frequency

fOSC

1000

1400

1800

kHz

Maximum Duty Cycle

POWER SWITCH

Current Limit (Note 2)

ILIM

VFB = 1V, duty cycle = 50%

0.55

0.8

On-Resistance

RON

0.7

Ω

VLX = 12V, TA = +25°C

0.1

Leakage Current

ILXOFF

VLX = 12V

µA

SOFT-START

Reset Switch Resistance

100

Ω

Charge Current

VSS = 1.2V

1.5

7.0

µA

CONTROL INPUT

Input Low Voltage

VIL

V SHDN, VIN = 2.6V to 5.5V

0.3

Input High Voltage

VIH

V SHDN, VIN = 2.6V to 5.5V

1.0

V SHDN = 3V

SHDN Input Current

ISHDN

V SHDN = 0

0.01

0.1

µA

Note 1: Thermal properties are specified with product mounted on PC board with one square-inch of copper area and still air.

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