LTC3831 Datasheet, PDF (4/20 Pages) Linear Technology – High Power Synchronous Switching Regulator Controller for DDR Memory Termination

LTC3831
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation
1.270
1.265
1.260
T_A = 25°C
REFER TO FIGURE 1
NEGATIVE OUTPUT CURRENT
INDICATES CURRENT SINKING
1.255
1.250
1.245
1.240
1.235
1.230
–6
–4 –2 0
2
4
6
OUTPUT CURRENT (A)
3831 G02
Line Regulation
1.260
10
T_A = 25°C
1.258
8
1.256
6
1.254
4
1.252
2
1.250
0
1.248
–2
1.246
–4
1.244
–6
1.242
–8
1.240
3
4
5
6
7
SUPPLY VOLTAGE (V)
–10
8
3831 G03
Output Temperature Drift
1.270
20
REFER TO FIGURE 1
1.265 ^{OUTPUT = NO LOAD}
15
1.260
10
1.255
5
1.250
0
1.245
–5
1.240
–10
1.235
–15
1.230
–50 –25 0
25 50 75
TEMPERATURE (°C)
–20
100
3831 G04
Error Amplifier Sink/Source
Current vs Temperature
200
180
160
140
120
100
80
60
40
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3831 G06
Oscillator Frequency
vs Temperature
250
FREQSET FLOATING
240
230
220
210
200
190
180
170
160
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3831 G08
Oscillator Frequency
vs FREQSET Input Current
600
T_A = 25°C
500
400
300
200
100
0
–40
–30 –20 –10 0 10 20
FREQSET INPUT CURRENT (µA)
3831 G09
Error Amplifier Transconductance
vs Temperature
800
750
700
650
600
550
500
–50 –25
0 25 50 75
TEMPERATURE (˚C)
100 125
3831 G05
Error Amplifier Open-Loop Gain
vs Temperature
60
55
50
45
40
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3831 G07
Oscillator (V_SAWH – V_SAWL)
vs External Sync Frequency
1.5
T_A = 25°C
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
100
200
300
400
500
EXTERNAL SYNC FREQUENCY (kHz)
3831 G10
3831f
4