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參數(shù)資料
| 型號： | SC480IMLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Complete DDR1/2/3 Memory Power Supply |
| 中文描述： | 完全DDR1/2/3內(nèi)存供電 |
| 文件頁數(shù)： | 3/25頁 |
| 文件大小： | 858K |
| 代理商： | SC480IMLTRT |
3
2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC480
TEST CONDITIONS: V
IN
= 15V, VCCA = VDDP = VTTEN = EN/PSV = 5V, VDDQ = VTTIN = 1.8V, R
TON
= 1M
Ω
. T
AMB
= -40 TO +85C.
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
1.485
1.515
V
VDDQS Regulation Threshold
FB = AGND
2.5
2.475
2.525
V
FB = VCCA
1.8
1.782
1.818
V
On-Time
RTON = 1M
Ω
, VDDQ = 1.8V
460
368
552
ns
RTON = 500k
Ω
, VDDQ = 1.8V
265
212
318
Minimum Off-Time
425
550
ns
VDDQS Input Resistance
FB < 0.3V
80
k
Ω
FB > 0.3V
91
k
Ω
VDDQS Shutdown
Discharge Resistance
EN/PSV = GND
16
Ω
FB Leakage Current
-1.0
1.0
μ
A
VDDQ Smart Psave Threshold
8
%
VTT Controller
REF Source Current
10
mA
REF Sink Resistance
50
k
Ω
REF Output Accuracy
IREF = 0 to 10mA
900
882
918
mV
Shutdown Discharge Resistance
(EN/PSV = GND)
VTT
0.25
Ω
REF
8
Ω
VTT Output Accuracy
(with respect to REF)
-2A < I
VTT
< 2A
(9)
0
-40
+40
mV
VTTS Leakage Current
-1.0
1.0
μ
A
Current Sensing
ILIM Current
DL High
10
9
11
μ
A
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 = 5k
Ω
50
35
65
mV
PGND1 - LX, RLIM = 10k
Ω
100
80
120
PGND1 - LX, RLIM = 20k
Ω
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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