SC251EVB SEMTECH [Semtech Corporation], SC251EVB Datasheet - Page 14

• Manufacturer Part Number: SC251EVB
• Description: Step-down DC-DC Converter with Bias LDO for WCDMA Amplifi ers
• Manufacturer: SEMTECH [Semtech Corporation]

Typical Characteristics (Cont.)
POWER MANAGEMENT
© 2006 Semtech Corp.
1.600
1.595
1.590
1.585
1.580
1.575
1.570
1.565
1.560
1.555
1.550
1000
975
950
925
900
875
850
100
90
80
70
60
50
40
30
20
10
0
2.5
0.0
0.0
0.1
I
0.5
OUT
=100mA
Oscillator Frequency vs. V
3
0.2
1.0
I
OUT
Effi ciency vs. V
=600mA
0.3
1.5
V
3.5
OUT
0.4
Vout(V)
V
I
OUT
vs. I
2.0
IN
(A)
(V)
0.5
OUT
4
2.5
OUT
0.6
3.0
0.7
4.5
IN
T
T
T
T
J
3.5
T
J
J
J
=-40
=25
=50
=85
J
0.8
=0
°
V
V
°
°
°
°
C
IN
IN
C
C
C
C
=4V
=4V
4.0
0.9
5
14
2.845
2.840
2.835
2.830
2.825
2.836
2.835
2.831
2.830
2.834
2.833
2.832
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.0001
0.2
2.5 2.7
2.9
0.4
3.1
3.3
0.6
3.5
V
V
V
3.7
OUT
REF
0.8
REF
3.9
0.0010
V
vs. V
I
DAC
vs. I
R EF
V
V
vs. V
MODE
IN
(A)
(V)
(V)
4.1
=V
1.0
IN
REF
DAC
4.3 4.5
IN
1.2
V
4.7
MODE
=GND
Pass-Through
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4.9
1.4
5.1
I
SC251
R EF
=5mA
5.3
0.0100
1.6
5.5