MAX1790 datasheet(3/14 Pages) MAXIM

Part #	MAX1790

Description	Low-Noise Step-Up DC-DC Converters

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Manufacturer	MAXIM [Maxim Integrated Products]

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Low-Noise Step-Up DC-DC Converters

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3

ELECTRICAL CHARACTERISTICS

(VIN = SHDN = 3V, FREQ = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)

ELECTRICAL CHARACTERISTICS (continued)

(VIN = SHDN = 3V, FREQ = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MAX1790

0.30

0.45

0.65

Current-Sense Transresistance

RCS

MAX8715

0.20

0.30

0.43

V/A

SOFT-START

Reset Switch Resistance

100

Ω

Charge Current

VSS = 1.2V

1.5

4

7.0

µA

CONTROL INPUTS

Input Low Voltage

VIL

SHDN, FREQ

0.3 x VIN

V

Input High Voltage

VIH

SHDN, FREQ

0.7 x VIN

V

Hysteresis

SHDN, FREQ

0.1 x VIN

V

FREQ Pulldown Current

IFREQ

1.8

5

9.0

µA

SHDN Input Current

ISHDN

0.001

1µA

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Range

VIN

2.6

5.5

V

VIN Undervoltage Lockout

UVLO

VIN rising, typical hysteresis is 40mV,

LX remains off below this level

2.25

2.52

V

VFB = 1.3V, not switching

0.35

MAX1790

VFB = 1.0V, switching

5

VFB = 1.3V, not switching

0.35

Quiescent Current

IIN

MAX8715

VFB = 1.0V, switching

5

mA

Shutdown Supply Current

IIN

SHDN = GND

10

µA

ERROR AMPLIFIER

Feedback Voltage

VFB

Level to produce VCOMP = 1.24V

1.215

1.24

1.260

V

MAX1790

40

FB Input Bias Current

IFB

VFB = 1.24V

MAX8715

190

nA

Feedback-Voltage Line

Regulation

Level to produce VCOMP = 1.24V,

2.6V < VIN < 5.5V

0.15

%/V

MAX1790

70

260

Transconductance

gm

ΔI = 5µA

MAX8715

70

260

µS

OSCILLATOR

FREQ = GND

490

770

Frequency

fOSC

FREQ = IN

900

1500

kHz

Maximum Duty Cycle

DC

FREQ = GND

78

92

%

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