MAX1992_05 datasheet(5/36 Pages) MAXIM

Part #	MAX1992

Description	Quick-PWM Step-Down Controllers

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Manufacturer	MAXIM [Maxim Integrated Products]

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Quick-PWM Step-Down Controllers with Inductor

Saturation Protection and Dynamic Output Voltages

_______________________________________________________________________________________

5

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, VCC = VDD = SHDN = 5V, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

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

SHDN, SKIP, GATE

rising edge, hysteresis = 225mV

1.20

1.7

2.20

V

Logic Input Current

SHDN, SKIP, GATE

-1

+1

µA

High

1.9

2.0

2.1

Dual Mode™ Threshold Voltage

MAX1992 FB

Low

0.05

0.1

0.15

V

High

VCC -

0.4V

Open

3.15

3.85

REF

1.65

2.35

Four-Level Input Logic Levels

TON, OVP/UVP,

LSAT, FBLANK

Low

0.5

V

Four-Level Logic Input Current

TON, OVP/UVP, LSAT,

FBLANK forced to GND or VCC

-3

+3

µA

ELECTRICAL CHARACTERISTICS

(V+ = 15V, VCC = VDD = SHDN = 5V, SKIP = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 4)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNITS

PWM CONTROLLER

VIN

Battery voltage, V+

2

28

Input Voltage Range

VBIAS

VCC, VDD

4.5

5.5

V

FB = GND

2.462

2.538

Output Voltage Accuracy

(MAX1992 Fixed)

VOUT

MAX1992,

V+ = 4.5V to 28V,

SKIP = VCC

(Note 2)

FB = VCC

1.773

1.827

V

Feedback Voltage Accuracy

(MAX1992 Adjustable)

VFB

MAX1992, V+ = 4.5V to 28V,

SKIP = VCC

(Note 2)

0.689

0.711

V

REFIN = 0.35

× REF

0.689

0.711

Feedback Voltage Accuracy

(MAX1993)

VFB

MAX1993,

V+ = 4.5V to 28V,

SKIP = VCC

(Note 2)

REFIN = REF

1.970

2.030

V

TON = GND (600kHz)

170

219

TON = REF (450kHz)

213

273

TON = open (300kHz)

316

389

On-Time

tON

V+ = 15V,

VOUT = 1.5V

(Note 3)

TON = VCC (200kHz)

461

571

ns

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

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