MAX1541 datasheet(9/49 Pages) MAXIM

Part #	MAX1541

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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9 / 49 page

Dual Step-Down Controllers with Saturation

Protection, Dynamic Output, and Linear Regulator

_______________________________________________________________________________________

9

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, VCC = VDD = ON1 = ON2 = 5V, SKIP = GND, LDOIN (MAX1541) = V+, TA = -40°C to +85°C, unless otherwise noted.)

(Note 4)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNITS

0 < ILDOOUT < 10mA

4.85

5.10

MAX1541 LDO Output-Voltage

Accuracy (Fixed VLDOOUT)

VLDOOUT

FBLDO = ON1 =

ON2 = GND,

VLDOIN = 6V to 28V

0 < ILDOOUT < 100mA

4.65

5.10

V

0 < ILDOOUT < 10mA

1.212

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

MAX1540A: V+ - VLDOOUT, ILDOOUT = 50mA

800

Dropout Voltage

MAX1541: VLDOIN - VLDOOUT,

ILDOOUT = 50mA

800

mV

REFERENCE (REF)

Reference Voltage

VREF

VCC = 4.5V to 5.5V, IREF = 0

1.98

2.02

V

REFIN1 Input Bias Current

IREFIN1

0.05

µA

FAULT DETECTION

Overvoltage Trip Threshold

With respect to error-comparator threshold,

OVP/UVP = VCC

10

21

%

Output Undervoltage-Protection

Trip Threshold

With respect to error-comparator threshold,

OVP/UVP = VCC

64

76

%

PGOOD_ Lower Trip Threshold

With respect to error-comparator threshold,

hysteresis = 1%

-14

-5

%

PGOOD_ Upper Trip Threshold

With respect to error-comparator threshold,

hysteresis = 1%

+5

+14

%

PGOOD_ Output Low Voltage

ISINK = 4mA

0.3

V

VCC Undervoltage-Lockout

Threshold

VUVLO(VCC)

Rising edge, PWM disabled below this

level, hysteresis = 20mV

4.1

4.4

V

CURRENT LIMIT

CSP_

0

2.7

Current-Limit Input Range

CSN_

-0.3

+28.0

V

Valley Current-Limit Threshold

(Fixed)

VLIM_ (VAL) VCSP_ - VCSN_, ILIM_ = VCC

40

60

mV

Valley Current-Limit Threshold

(Adjustable)

VLIM_ (VAL) VCSP_ - VCSN_, VILIM_ = 2.00V

160

240

mV

INPUTS AND OUTPUTS

Logic Input Threshold

ON1, ON2,

SKIP, GATE, rising edge,

hysteresis = 225mV

1.2

2.2

V

LDOON Input Trip Level

Rising edge, hysteresis = 250mV

1.2

1.3

V

High

1.9

2.1

Dual Mode Threshold Voltage

FB1 (MAX1540A),

FB2 (MAX1540A/MAX1541)

Low

0.05

0.15

V

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