MAX1992ETG datasheet(6/36 Pages) MAXIM

Part #	MAX1992ETG

Description	Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages

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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

6

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(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

Minimum Off-Time

tOFF(MIN)

(Note 3)

500

ns

FB forced above the regulation point,

LSAT = GND

0.85

Quiescent Supply Current (VCC)

ICC

FB forced above the regulation point,

VLSAT > 0.5V

1.0

mA

Quiescent Supply Current (VDD)

IDD

FB forced above the regulation point

5

µA

Quiescent Supply Current (V+)

IV+

40

µA

Shutdown Supply Current (VCC)

SHDN = GND

7

µA

Shutdown Supply Current (VDD)

SHDN = GND

5

µA

Shutdown Supply Current (V+)

SHDN = GND, V+ = 28V,

VCC = VDD = 0 or 5V

5µA

REFERENCE

Reference Voltage

VREF

VCC = 4.5V to 5.5V, IREF = 0

1.980

2.020

V

REFIN Voltage Range

0.7

VREF

V

FAULT DETECTION

Overvoltage Trip Threshold

With respect to error comparator threshold,

OVP/UVP = VCC

10

20

%

Output Undervoltage Protection

Trip Threshold

With respect to error comparator threshold,

OVP/UVP = VCC

65

75

%

PGOOD Lower Trip Threshold

With respect to error comparator threshold,

hysteresis = 1%

-14

-6

%

PGOOD Upper Trip Threshold

With respect to error comparator threshold,

hysteresis = 1%

+6

+14

%

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

35

65

mV

Valley Current-Limit Threshold

(Adjustable)

VLIM(VAL)

VCSP - VCSN, VILIM = 2.00V

160

240

mV

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