SC488 datasheet(4/24 Pages) SEMTECH

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POWER MANAGEMENT

SC488

Parameter

Conditions

25°C

-40°C to 85°C

Units

Min

Typ

Max

Min

Max

VDDQ Fault Protection (continued)

Under-Voltage Fault Delay

FB Forced Below UV V

clks(3)

Under-Voltage Blank Time

From EN High

440

clks(3)

Output Over-Voltage Fault

With Respect to FB Regulation Point

+16

+12

+20

Over-Voltage Fault Delay

FB Above Over-Voltage Threshold

μs

PGD Low Output Voltage

Sink 1mA

0.1

PGD Leakage Current

FB in Regulation, PGD = 5V

μA

PGD UV Threshold

With Respect to FB Regulation Point

-10

-12

-8

PGD Fault Delay

FB Forced Outside PGD Window

μs

VCCA Under-Voltage (UVLO)

Falling Edge (Hysteresis 100 mV)

3.70

4.35

VTT Fault Protection

UV Lower Threshold

VTT w/rt REF

-12

-16

-8

OV Upper Threshold

VTT w/rt REF

+12

+16

Fault Shutdown Delay

VTT Outside OV/UV Window

μs

Thermal Shutdown(4)(5)

160

150

170

°C

Inputs/Outputs

Logic Input Low Voltage

EN/PSV Low/Low (Disabled)

1.2

VTTEN Low (VTT Disabled)

0.6

Logic Input High Voltage

EN/PSV Low/High

(Enabled, Psave Disabled)

1.2

2.4

VTTEN High (VTT Enabled)

2.4

Logic Input High Voltage

EN/PSV High/High

(Enabled, Psave Enabled)

3.1

EN/PSV Input Resistance

Sourcing

1.5

MΩ

Sinking

1.0

VTTEN Leakage Current

-1

μA

Soft-Start

VDDQ Soft-Start Ramp Time

EN/PSV High to PGD High

440

clks(3)

VTT Soft-Start Ramp Rate(6)

5.5

mV/μs

FB Input Thresholds

FB Logic Input Low

VDDQ Set for 2.5V (DDR1)

0.3

FB Logic Input High

VDDQ Set for 1.8V (DDR2)

VCCA

- 0.7

Electrical Characteristics (Cont.)

SC488 Datasheet(PDF) 4 Page - Semtech Corporation

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