LTC3831-1 Datasheet, PDF (4/20 Pages) Linear Technology – High Power Synchronous Switching Regulator Controller for DDR Memory Termination

LTC3831-1
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation
0.762
0.760
0.758
0.756
T_A = 25°C
REFER TO FRONT PAGE APPLICATION
NEGATIVE OUTPUT CURRENT
INDICATES CURRENT SINKING
0.754
0.752
0.750
0.748
0.746
0.744
0.742
0.740
0.738
–10 –8 –6 –4 –2 0 2 4 6 8 10
OUTPUT CURRENT (A)
3831 G02
Line Regulation
0.760
10
T_A = 25°C
0.758
8
0.756
6
0.754
4
0.752
2
0.750
0
0.748
–2
0.746
–4
0.744
–6
0.742
–8
0.740
3
4
5
6
7
V_CC SUPPLY VOLTAGE (V)
–10
8
3831 G03
Output Voltage Temperature Drift
0.762
0.760
REFER TO FRONT PAGE APPLICATION
OUTPUT = NO LOAD
0.758
0.756
0.754
0.752
0.750
0.748
0.746
0.744
0.742
0.740
0.738
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
12
10
8
6
4
2
0
–2
–4
–6
–8
–10
–12
125
3831 G05
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
360
FREQSET FLOATING
350
340
330
320
310
300
290
280
270
260
250
240
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3831 G08
Oscillator Frequency
vs FREQSET Input Current
700
T_A = 25°C
600
500
400
300
200
100
0
30 20 10 0 10 20 30
FREQSET INPUT CURRENT (µA)
3831 G09
Error Amplifier Transconductance
vs Temperature
2400
2300
2200
2100
2000
1900
1800
1700
1600
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3831 G04
Error Amplifier Open-Loop Gain
vs Temperature
70
65
60
55
50
–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
38311f
4