sc250wltrt Semtech Corporation, sc250wltrt Datasheet - Page 15

• Manufacturer Part Number: sc250wltrt
• Description: Sc250 Step-down Dc-dc Converter With Bias Ldo For Rf Power Amplifiers
• Manufacturer: Semtech Corporation

© 2006 Semtech Corp.
POWER MANAGEMENT
Typical Characteristics (Cont.)
450
400
350
300
250
200
150
100
Condition V
50
Condition V
V
0
-45
DAC
Step Response (Pass-through)
V
IN
R
IN
DAC
=4.2V, Load=15Ω, V
=3.6V, Load=15Ω, V
DSON
Time (40μs/div)
Time (40μs/div)
Step Response
5
vs. Temperature, V
PMOS
NMOS
PASS
T J (°C)
55
DAC
DAC
=0.5 to 1.1V
=0.7 to 1.7V
IN
= 3.6V
105
V
V
V
OUT
DAC
LX
V
V
V
OUT
DAC
LX
(2V/div)
(1V/div)
(500mV/div)
(2V/div)
(1V/div)
(1V/div)
155
15
400
350
300
250
200
150
100
V
Condition V
50
0
Condition V
DAC
2.5
Step Response (100% duty)
Enable Transient
IN
3.0
IN
=3V, Load=15Ω, V
Time (40μs/div)
=3.6V, Load=15Ω, V
Time (40μs/div)
3.5
R
DSON
PMOS
NMOS
PASS
V
DAC
IN
4.0
vs. V
(V)
=0.7 to 1V
DAC
=0.7V
IN
4.5
PRELIMINARY
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V
V
V
V
V
V
OUT
LX
EN
OUT
DAC
LX
SC250
5.0
(2V/div)
(2V/div)
(2V/div)
(1V/div)
(1V/div)
(500mV/div)
5.5