MAX1992ETG datasheet(3/36 Pages) MAXIM

Part #	MAX1992ETG

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

_______________________________________________________________________________________

3

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

TON = GND (600kHz)

170

194

219

TON = REF (450kHz)

213

243

273

TON = open (300kHz)

316

352

389

On-Time

tON

V+ = 15V,

VOUT = 1.5V

(Note 3)

TON = VCC (200kHz)

461

516

571

ns

Minimum Off-Time

tOFF(MIN)

(Note 3)

400

500

ns

FB forced above the regulation point,

LSAT = GND

0.55

0.85

Quiescent Supply Current (VCC)

ICC

FB forced above the regulation point,

VLSAT > 0.5V

1

mA

Quiescent Supply Current (VDD)

IDD

FB forced above the regulation point

<1

5

µA

Quiescent Supply Current (V+)

IV+

25

40

µA

Shutdown Supply Current (VCC)

SHDN = GND

<1

7

µA

Shutdown Supply Current (VDD)

SHDN = GND

<1

5

µA

Shutdown Supply Current (V+)

SHDN = GND, V+ = 28V,

VCC = VDD = 0 or 5V

<1

5

µA

REFERENCE

TA = +25°C to +85°C

1.986

2

2.014

Reference Voltage

VREF

VCC = 4.5V to 5.5V,

IREF = 0

TA = 0°C to +85°C

1.983

2

2.017

V

Reference Load Regulation

ΔVREF

IREF = -10µA to 50µA

-0.01

+0.01

V

REF Lockout Voltage

VREF(UVLO) Rising edge, hysteresis = 350mV

1.95

V

REFIN Voltage Range

0.7

VREF

V

REFIN Input Bias Current

IREFIN

0.01

0.05

µA

FAULT DETECTION

Overvoltage Trip Threshold

With respect to error comparator threshold,

OVP/UVP = VCC

12

16

20

%

Overvoltage Fault Propagation

Delay

tOVP

FB forced 2% above trip threshold

10

µs

Output Undervoltage Protection

Trip Threshold

With respect to error comparator threshold,

OVP/UVP = VCC

65

70

75

%

Output Undervoltage Protection

Blanking Time

tBLANK

From rising edge of

SHDN

10

35

ms

Output Undervoltage Fault

Propagation Delay

tUVP

10

µs

PGOOD Lower Trip Threshold

With respect to error comparator threshold,

hysteresis = 1%

-13

-10

-7

%

PGOOD Upper Trip Threshold

With respect to error comparator threshold,

hysteresis = 1%

+7

+10

+13

%

PGOOD Propagation Delay

tPGOOD

FB forced 2% beyond PGOOD trip

threshold

10

µs

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