SC1480A Ver la hoja de datos (PDF) - Semtech Corporation

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Fabricante

SC1480A

DDR and DDR Memory VTT power Supply Controller

Semtech Corporation 

SC1480A

POWER MANAGEMENT

Electrical Characteristics Cont.

Test Conditions: VBAT = 2.5V, REFIN = 1.25, VCCA = VDDP = 5.0V, VOUT = 1.25V, RTON = 1MΩ

Parameter

Conditions

25°C

-40°C to 125°C Units

Min Typ Max Min

Max

Controller

Error Comparator Threshold

(FB Turn-on Threshold) (1)

On-Time

Minimum Off Time

VCCA = 4.5V to 5.5V

R

TON

=

1MΩ

RTON = 500kΩ

REFOUT

1660

913

400

REFOUT REFOUT mV

-10

+10

1411

1909

ns

776

1050 ns

550

ns

FB Input Resistance

Over-Current Sensing

500

kΩ

ILIM Sink Current

DL high

10

9

11

µA

Current Comparator Offset

PGND - ILIM

-10

+10

mV

Reference Buffer

REFOUT Source Current

3

mA

REFIN Enable Threshold

REFIN rising

0.50

0.60

V

REFIN Enable Hysteresis

30

mV

REFOUT DC Accuracy

No load, REFIN = 1.25V

1.240

1.260 1.238 1.262 mV

Fault Protection

Current Limit (Positive) (2)

Current Limit (Negative)

PGND-LX, RILIM = 5kΩ

PGND-LX, RILIM = 10kΩ

PGND-LX, RILIM = 20kΩ

PGND-LX

50

100

200

-125

35

80

170

-160

65

mV

120 mV

230

mV

-90

mV

Output Under-Voltage Fault

With respect to REFOUT

-20

-28

-15

%

Output Over-Voltage Fault

With respect to REFOUT

+10

+8

+12

%

Over-Voltage Fault Delay

FB forced above OV

5

µs

threshold

PGD Low Output Voltage

Sink 1mA

0.4

V

PGD Leakage Current

FB in regulation, PGD = 5V

1

µA

PGD UV Threshold

With respect to REFOUT

-10

-15

-8

%

 2003 Semtech Corp.

3

www.semtech.com

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