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SC488 Datasheet(PDF) 3 Page - Semtech Corporation

Part # SC488
Description  Complete DDR1/2/3 Memory Power Supply
PDF  24 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC488 Datasheet(HTML) 3 Page - Semtech Corporation

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



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