500mV to 5.5V Input, Ultrasonic

Boost Converter with Short-Circuit

Protection and True Shutdown

MAX18002

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Analog Devices | 4

Electrical Characteristics

(VIN = 3V, VOUT = 3.3V, EN = high, TJ = -40ºC to +125ºC, unless otherwise specified. See Note 2.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

VIN

Input range after start-up

0.5

5.5

V

Input Voltage UVLO

VIN_UVLO

VIN rising, when VOUT is 1V or below

1.75

1.8

1.85

V

VIN falling, when VOUT is 1V or below

1.65

1.7

1.75

Supply Current Into

OUT

IQ_OUT

VEN = VIN, not switching, TJ = +25°C,

RSEL = 191kΩ (Note 3)

150

1600

µA

Supply Current Into IN

IQ_IN

VEN = VIN, not switching, TJ = +25°C,

RSEL = 191kΩ (Note 3)

-3

-1

1

µA

Input Shutdown Current

ISD_IN

VEN = 0V, VOUT = 0V, TJ = +25°C

7

36

nA

LX Maximum Duty

Cycle

DC_USM

TJ = +25°C (Note 4)

85

%

POWER SWITCHES

High-Side RDSON

RDS_H

60

90

mΩ

Low-Side RDSON

RDS_L

30

60

mΩ

OUTPUT VOLTAGE

Output-Voltage Range

VOUT

(Note 5)

2.5

5.5

V

Output Accuracy

VOUT_ACC

Measured when the part exits USM and

is in skip mode (Note 6)

-1

+1

%

DC Load Regulation

ACCLOAD

Load from 20mA to IOUT at 80% of peak

inductor current

-1

%

DC Line Regulation

ACCLINE

Duty cycle varied from 25% to maximum

-1

%

LX SWITCHING WAVEFORMS

Switching Frequency

FSW

VIN = 3.3V, VOUT - VIN > 0.25V, TJ =

+25°C

2

MHz

LX TON

TON_3.3V

VIN = 3.3V, VOUT = 5V

136

170

204

ns

TON_1.8V

VIN = 1.8V, VOUT = 5V

256

320

384

LX Minimum TON

TONMIN

VIN = 3V, VOUT = 3.3V

50

60

70

ns

LX Minimum TOFF

TOFFMIN

VIN = 3V, VOUT = 3.3V

50

60

70

ns

LIGHT LOAD CONDITION

Ultrasonic Mode

Minimum Switching

Frequency

FUSM

VIN = 3.3V, VOUT - VIN > 0.25V

22

29

35

kHz

Zero Crossing

Threshold

IZX_LX

(Note 7)

75

150

225

mA

STARTUP

Soft-Start Time

tSS_LINEAR

Target VIN = VOUT = 3.6V, linear mode,

COUTEFF = 22μF, TJ = +25°C

350

µs

Soft-Start Rate

dV/dt

VIN = 3.6V, VOUT from 3.3V to 5V, boost

mode, COUTEFF = 22μF, TJ = +25°C

3

V/ms

ENABLE, RSEL, ACTIVE DISCHARGE

Required Select

Resistor Accuracy

ACCRSEL

Use the resistor from the RSEL selection

table

±1

%

Select Resistor

Detection Time

tRSEL

CRSEL < 2pF (Note 8)

600

1320

µs

Active Discharge

Resistance

RDIS

Between OUT and GND when EN = low,

TJ = +25°C

100

Ω