LTC3772BETS8 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3772BETS8' PDF : 20 Pages View PDF
TYPICAL PERFOR A CE CHARACTERISTICS
LTC3772B
Maximum Current Sense
Threshold vs Temperature
300
250
IPRG = VIN
200
150
IPRG = FLOAT
100
IPRG = GND
50
0
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3772B G13
Soft-Start Time vs Temperature
1100
1000
900
800
700
600
500
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3772B G14
Foldback Frequency
vs Temperature
230 VFB = 0V
220
210
200
190
180
170
160
150
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3772B G15
Efficiency vs Load Current
100
VIN = 3.3V
90
VIN = 4.2V
80
VIN = 7V
VIN = 5V
70
Efficiency vs Load Current
100
90
VOUT = 3.3V
VOUT = 2.5V
80
VOUT = 1.8V
70
60
60
50
VOUT = 2.5V
FIGURE 5 CIRCUIT
40
1
10
100
1000 10000
LOAD CURRENT (mA)
3772B G16
Start-Up
50
40
10
VIN = 5V
FIGURE 5 CIRCUIT
100
1000
LOAD CURRENT (mA)
10000
3772B G17
Load Step
VOUT
1V/DIV
ITH/RUN
1V/DIV
INDUCTOR
CURRENT
2A/DIV
VIN = 5V
500µs/DIV
VOUT = 2.5V
RLOAD = 1.5Ω
FIGURE 5 CIRCUIT
3772B G18
VOUT
100mV/DIV
(AC)
IL
2A/DIV
ILOAD
2A/DIV
VIN = 5V
20µs/DIV
VOUT = 2.5V
ILOAD = 100mA TO 1.5A
FIGURE 5 CIRCUIT
3772B G19
3772bfa
5
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