MAX1540AETJ datasheet(6/49 Pages) MAXIM

Part #	MAX1540AETJ

Description	Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual Step-Down Controllers with Saturation

Protection, Dynamic Output, and Linear Regulator

6

_______________________________________________________________________________________

Dual Mode is a trademark of Maxim Integrated Products, Inc.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Valley Current-Limit Threshold

(Fixed)

VLIM_ (VAL) VCSP_ - VCSN_, ILIM_ = VCC

45

50

55

mV

VILIM_ = 250mV

15

25

35

Valley Current-Limit Threshold

(Adjustable)

VLIM_ (VAL) VCSP_ - VCSN_

VILIM_ = 2.00V

170

200

230

mV

Current-Limit Threshold

(Negative)

VNEG

VCSP_ - VCSN _, SKIP = ILIM_ = VCC,

TA = +25°C

-90

-65

-45

mV

Current-Limit Threshold

(Zero Crossing)

VZX

With respect to valley current-limit

threshold, VCSP_ - VCSN _, SKIP = GND,

ILIM_ = VCC

2.5

mV

LSAT = VCC

180

200

220

LSAT = open

157

175

193

Inductor-Saturation Current-Limit

Threshold

With respect to

valley current-

limit threshold,

ILIM_ = VCC

LSAT = REF

135

150

165

%

ILIM_ Saturation Fault Sink

Current

IILIM_ (LSAT)

VCSP - VCSN > inductor saturation current

limit, 0.25V < VILIM_ < 2.0V

468

µA

ILIM_ Leakage Current

VCSP_ - VCSN _ < inductor saturation current

limit

0.1

µA

GATE DRIVERS

DH_ Gate-Driver On-Resistance

RDH

BST_-LX_ forced to 5V

1.5

5

Ω

DL_, high state

1.5

5

DL_ Gate-Driver On-Resistance

RDL

DL_, low state

0.6

3

Ω

DH_ Gate-Driver Source/Sink

Current

IDH

DH_ forced to 2.5V, BST_-LX_ forced to 5V

1

A

DL_ Gate-Driver Source Current

IDL

(SOURCE)

DL_ forced to 2.5V

1

A

DL_ Gate-Driver Sink Current

IDL (SINK)

DL_ forced to 2.5V

3

A

DL_ rising

35

Dead Time

tDEAD

DH_ rising

26

ns

INPUTS AND OUTPUTS

OD On-Resistance

ROD

GATE = VCC

10

25

Ω

OD Leakage Current

GATE = GND, OD forced to 5.5V

1

200

nA

Logic Input Threshold

ON1, ON2,

SKIP, GATE rising edge,

hysteresis = 225mV

1.2

1.7

2.2

V

LDOON Input Trip Level

Rising edge, hysteresis = 250mV

1.20

1.25

1.30

V

Logic Input Current

ON1, ON2, LDOON,

SKIP, GATE

-1

+1

µA

High

1.9

2.0

2.1

Dual Mode™ Threshold Voltage

FB1 (MAX1540A),

FB2 (MAX1540A/

MAX1541)

Low

0.05

0.1

0.15

V

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, VCC = VDD = ON1 = ON2 = 5V, SKIP = GND, LDOIN (MAX1541) = V+, TA = 0°C to +85°C, unless otherwise noted. Typical

values are at TA = +25

°C.)

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