SC480EVB Просмотр технического описания (PDF) - Semtech Corporation

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SC480EVB

Complete DDR1/2/3 Memory Power Supply

Semtech Corporation 

SC480

PPOOWWEERR MMAANNAAGGEEMMEENNTT

Electrical Characteristics (Cont.)

TEST CONDITIONS: VIN = 15V, VCCA = VDDP = VTTEN = EN/PSV = 5V, VDDQ = VTTIN = 1.8V, RTON = 1MΩ. TAMB = -40 TO +85C.

Parameter

Conditions

25°C

Min Typ Max

-40°C to 85°C

Min Max

Units

Under-Voltage Fault Delay

Under-Voltage Blank Time

FB Forced Below UV VTH

8

From EN High

440

clks(3)

clks(3)

Output Over-Voltage Fault

With Respect to FB Regulation Point

+16

+12 +20

%

Over-Voltage Fault Delay

FB Above Over-Voltage Threshold

5

μs

PGD Low Output Voltage

Sink 1mA

0.1

V

PGD Leakage Current

FB in Regulation, PGD = 5V

1

μA

PGD UV Threshold

With Respect to FB Regulation Point

-10

-12

-8

%

PGD Fault Delay

FB Forced Outside PGD Window

5

μs

VCCA Under-Voltage (UVLO)

Falling Edge (Hysteresis 100 mV)

4

3.70 4.35

V

VTT Fault Protection

UV Lower Threshold

OV Upper Threshold

Fault Shutdown Delay

Thermal Shutdown(4)(5)

Inputs/Outputs

Logic Input Low Voltage

Logic Input High Voltage

Logic Input High Voltage

EN/PSV Input Resistance

VTTEN Leakage Current

Soft-Start

VDDQ Soft-Start Ramp Time

VTT w/rt REF

VTT w/rt REF

VTT Outside OV/UV Window

EN/PSV Low/Low (Disabled)

VTTEN Low (VTT Disabled)

EN/PSV Low/High

(Enabled, Psave Disabled)

VTTEN High (VTT Enabled)

EN/PSV High/High

(Enabled, Psave Enabled)

Sourcing

Sinking

EN/PSV High to PGD High

-12

-16

-8

%

+12

+8 +16

%

50

μs

160

150 170

°C

1.2

V

0.6

1.2

2.4

V

2.4

3.1

V

1.5

MΩ

1.0

MΩ

-1

+1

μA

440

clks(3)

VTT Soft-Start Ramp Rate(6)

5.5

mV/μs

© 2006 Semtech Corp.

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