500mV to 5.5V Input nanoPower

Boost Converter with Short-Circuit

Protection

and True Shutdown

MAX18000

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(VIN = 3V, VOUT = 3.3V, EN = HIGH, TJ = -40°C to +125°C, unless otherwise specified, (Note 2).)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Select Resistor

Detection Time

tRSEL

CRSEL < 2pF, (Note 7)

600

1320

µs

Active Discharge

Resistance

RDIS

Between OUT and GND, when EN = low

100

Ω

Enable Input Leakage

ILEAK_EN

TJ = 25°C, VEN = 5.5V

1.5

100

nA

Enable Voltage

Threshold

VIH

VEN rising, LX begins switching

0.8

1.2

V

VIL

VEN falling, LX stops switching

0.4

PROTECTION

Inductor Peak Current

Limit

IPEAK_LX

VOUT = 3.3V (Note 6)

3

3.6

4

A

Short Circuit Current

Limit

ISC

VIN = VEN = 2.5V, VOUT < 0.5V, VOUT

Hysteresis = 100mV

400

700

1000

mA

Short Circuit Detection

Time

tSC

VIN – VOUT = 0.7V

100

ns

Thermal Shutdown

Threshold

TSHUT_R

TJ Rising

165

˚C

TSHUT_F

TJ Falling

150

Note 2: Limits over the specified operating temperature and supply voltage range are guaranteed by design and characterization,

and production is tested at room temperature only.

Note 3: VIN should be at least 200mV lower than VOUT, so that part operates in boost mode.

Note 4: Guaranteed by measuring LX frequency and duty cycle. Maximum duty cycle is a function of input voltage since LX on time

varies with VIN.

Note 5: This does not account for ripple, load regulation, and line regulation.

Note 6: This is a static measurement. The actual peak current limit and zero-crossing threshold depend on VIN and L due to

propagation delays.

Note 7: This is the time required to determine the RSEL value. This time adds to the startup time.

Note 8: nanoPower is disabled when OUT regulation is set above 5V.

Note 9: The 83mV (typical) was measured at 3.3VIN, 3.3VOUT. The regulation hysteresis is typically set to 2.5% of the output

voltage for other VOUT levels. The hysteresis measurement does not account for ripple.