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Part Name
Description
LTC1625 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1625
No RSENSE Current Mode Synchronous Step-Down Switching Regulator
Linear Technology
'LTC1625' PDF : 24 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LTC1625
Maximum Current Sense Voltage
vs Duty Cycle
200
150
100
50
0
0
0.2 0.4 0.5 0.8 1.0
DUTY CYCLE
1625 G10
FCB Pin Current vs Temperature
0
– 0.25
– 0.50
– 0.75
– 1.00
– 1.25
– 1.50
– 40 –15
10 35 60 85
TEMPERATURE (
°
C)
110 135
1625 G13
Transient Response
Maximum Current Sense Voltage
vs Temperature
160
Oscillator Frequency
vs Temperature
300
250
SYNC = 1.5V
155
200
SYNC = 0V
150
150
100
145
50
140
– 40 –15
10 35 60 85
TEMPERATURE (
°
C)
110 135
1625 G11
0
– 40 –15
10 35 60 85
TEMPERATURE (
°
C)
110 135
1625 G12
RUN/SS Pin Current
vs Temperature
0
Soft Start:
Load Current vs Time
INDUCTOR
–1
CURRENT
2A/DIV
–2
–3
–4
–5
–40 –15
10 35 60 85
TEMPERATURE (
°
C)
110 135
1625 G14
RUN/SS
2V/DIV
20ms/DIV
V
IN
= 20V
V
OUT
= 5V
R
LOAD
= 1
Ω
FIGURE 1 CIRCUIT
1625 F06
Transient Response
(Burst Mode Operation)
Burst Mode Operation
V
OUT
50mV/DIV
V
IN
= 20V
200
µ
s/DIV
V
OUT
= 5V
I
LOAD
= 1A TO 4A
FIGURE 1 CIRCUIT
V
OUT
50mV/DIV
1625 F07
V
IN
= 20V
500
µ
s/DIV
V
OUT
= 5V
I
LOAD
= 50mA TO 1A
FIGURE 1 CIRCUIT
V
OUT
50mV/DIV
I
TH
100mV/DIV
1625 F08
V
IN
= 20V
50
µ
s/DIV
V
OUT
= 5V
I
LOAD
= 50mA
FIGURE 1 CIRCUIT
1625 F09
5
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