MAX1540 datasheet(4/49 Pages) MAXIM

Part #	MAX1540

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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4 / 49 page

Dual Step-Down Controllers with Saturation

Protection, Dynamic Output, and Linear Regulator

4

_______________________________________________________________________________________

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.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

FB_ = GND

70

145

350

MAX1540

FB_ = VCC or

adjustable

50

115

220

FB1 = OUT1

400

700

1500

FB2 = GND

90

170

350

OUT_ Input Resistance

ROUT_

MAX1541

FB2 = VCC or

adjustable

60

130

270

k

Ω

OUT_ Discharge Mode On-

Resistance

RDISCHARGE

10

25

Ω

OUT_ Synchronous-Rectifier

Discharge-Mode Turn-On Level

0.2

0.3

0.4

V

Soft-Start Ramp Time

tSS

Rising edge on ON_ to full current limit

1.7

ms

TON = GND (620kHz)

149

169

190

TON = REF (485kHz)

191

216

242

TON = open (345kHz)

274

304

335

DH1 On-Time

tON1

V+ = 15V,

VOUT1 = 1.5V

(Note 3)

TON = VCC (235kHz)

402

447

491

ns

TON = GND (460kHz)

201

228

256

TON = REF (355kHz)

260

296

331

TON = open (255kHz)

371

412

453

DH2 On-Time

tON2

V+ = 15V,

VOUT2 = 1.5V

(Note 3)

TON = VCC (170kHz)

556

618

679

ns

On-Time Tracking

tON2 with respect to tON1 (Note 3)

120

135

150

%

Minimum Off-Time

tOFF(MIN)

(Note 3)

400

500

ns

LINEAR REGULATOR (LDO) (Note 1)

0 < ILDOOUT < 10mA

4.85

5.0

5.10

MAX1540 LDO Output-Voltage

Accuracy

VLDOOUT

ON1 = ON2 = GND,

V+ = 6V to 28V

0 < ILDOOUT < 100mA

4.70

5.10

V

0 < ILDOOUT < 10mA

4.85

5.0

5.10

MAX1541 LDO Output-Voltage

Accuracy (Fixed VLDOOUT)

VLDOOUT

FBLDO = ON1 =

ON2 = GND,

VLDOIN = 6V to 28V

0 < ILDOOUT < 100mA

4.70

5.10

V

0 < ILDOOUT < 10mA

1.212

1.25

1.275

MAX1541 LDO Feedback

Accuracy (Adjustable VLDOOUT)

VFBLDO

FBLDO = LDOOUT,

ON1 = ON2 = GND,

VLDOIN = 4.5V to

28V

0 < ILDOOUT < 100mA

1.175

1.275

V

MAX1541 LDO Output

Adjust Range

1.175

24

V

LDOOUT Short-Circuit Current

130

mA

FBLDO Input Bias Current

IFBLDO

-0.1

+0.1

µA

MAX1540: V+ - VLDOOUT, ILDOOUT = 50mA

500

800

Dropout Voltage

MAX1541: VLDOIN - VLDOOUT,

ILDOOUT = 50mA

500

800

mV

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