SC488 Semtech Corporation, SC488 Datasheet - Page 3

• Manufacturer Part Number: SC488
• Description: Complete DDR1/2/3 Memory Power Supply
• Manufacturer: Semtech Corporation

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POWER MANAGEMENT
Electrical Characteristics (Cont.)
© 2006 Semtech Corp.
Parameter
VDDQ Controller
FB Error Comparator
Threshold
VDDQS Regulation Threshold
On-Time
Minimum Off-Time
VDDQS Input Resistance
VDDQS Shutdown
Discharge Resistance
FB Leakage Current
VDDQ Smart
Psave Threshold
VTT Controller
REF Source Current
REF Sink Resistance
REF Output Accuracy
Shutdown Discharge
Resistance (EN/PSV = GND)
VTT Output Accuracy
(with respect to REF)
VTTS Leakage Current
Current Sensing
ILIM Current
Current Comparator Offset
Zero-Crossing Threshold
VDDQ Fault Protection
Current Limit (Positive)
Current Limit (Negative)
Output Under-Voltage Fault
(1)
(2)
With Respect to FB Regulation Point
With Adjustable Resistor Divider
RTON = 500kΩ, VDDQ = 1.8V
RTON = 1MΩ, VDDQ = 1.8V
PGND1 - LX, EN/PSV = 5V
PGND1 - LX, RLIM = 10kΩ
PGND1 - LX, RLIM = 20kΩ
PGND1 - LX, RLIM = 5kΩ
IREF = 0 to 10mA
EN/PSV = GND
-2A < I
PGND1 - ILIM
PGND1 - LX
Conditions
FB = AGND
FB = VCCA
FB < 0.3V
FB > 0.3V
DL High
VTT
REF
VTT
< 2A
(9)
3
Min
1.500
25°C
0.32
-125
Typ
460
265
400
900
100
200
-30
2.5
1.8
80
91
16
50
10
50
8
8
0
5
Max
1.4775
2.4625
1.773
-160
-40°C to 85°C
Min
-1.0
-1.0
368
212
882
170
-40
-10
-35
10
35
80
9
1.5225
2.5375
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1.827
Max
+40
552
318
550
918
120
230
-90
-25
1.0
1.0
10
65
11
SC488
Units
mA
mV
mV
mV
mV
mV
mV
kΩ
kΩ
μA
μA
μA
ns
ns
%
%
Ω
Ω
V
V
V