MAX189 datasheet(3/10 Pages) MAXIM

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1.4MHz SOT23 Current-Mode

Step-Up DC-DC Converter

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ELECTRICAL CHARACTERISTICS

(VIN = VSHDN = 3V, FB = GND, SS = open, TA = -40°C to +85°C, unless otherwise noted.) (Note 3)

Note 2: Current limit varies with duty cycle due to slope compensation. See the Output Current Capability section.

Note 3: Specifications to -40°C are guaranteed by design and not production tested.

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

2.55

VFB = 1.3V, not switching

0.4

Quiescent Current

IIN

VFB = 1.0V, switching

Shutdown Supply Current

V SHDN = 0

µA

ERROR AMPLIFIER

Feedback Regulation Set Point

VFB

1.2

1.25

FB Input Bias Current

IFB

VFB = 1.24V

Line Regulation

2.6V < VIN < 5.5V

0.20

%/V

OSCILLATOR

Frequency

fOSC

1000

1800

kHz

Maximum Duty Cycle

POWER SWITCH

Current Limit (Note 2)

ILIM

VFB = 1V, duty cycle = 50%

0.55

On-Resistance

RON

Ω

Leakage Current

ILXOFF

VLX = 12V

µA

SOFT-START

Reset Switch Resistance

100

Ω

Charge Current

VSS = 1.2V

1.25

7.50

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

I SHDN

V SHDN = 0

0.1

µA

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