LTC3876_15 Datasheet, PDF (9/48 Pages) Linear Technology – Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and 50mA VTT Reference

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3876
Error Amplifier Transconductance
vs Temperature
1.80
VDDQ CH2
VTT CH2
1.75
1.70
1.65
1.60
1.55
1.50
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3876 G28
RUN Pin Thresholds
vs Temperature
1.6
1.4
SWITCHING REGION
1.2
1.0
STAND-BY REGION
0.8
0.6
SHUTDOWN REGION
0.4
0.2
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3876 G31
INTV_CC Undervoltage Lockout
Thresholds vs Temperature
4.5
4.3
UVLO RELEASE
(INTV_CC RISING)
4.1
3.9
3.7
UVLO LOCK
(INTV_CC FALLING)
3.5
3.3
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3876 G34
VDDQ Current Sense Voltage
vs ITH Voltage
120
100
80
60
40
20
0
–20
–40
–60
0
V_RNG = 2V
V_RNG = 1V
V_RNG = 0.6V
0.4 0.8 1.2 1.6 2 2.4
ITH VOLTAGE (V)
3876 G29
RUN Pull-Up Currents
vs Temperature
16
14
12
RUN PIN ABOVE SWITCHING
THRESHOLD
10
8
6
4 ^{RUN PIN BELOW SWITCHING}
THRESHOLD
2
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3876 G32
Shutdown Current into V_IN Pin
vs Voltage on V_IN Pin
40
35
30
25
20
15
10
130°C
5
25°C
–45°C
0
0 5 10 15 20 25 30 35 40
V_IN (V)
3876 G35
VTT Current Sense Voltage
vs ITH Voltage
120
90
60
30
0
–30
–60
–90
–120
0
V_RNG = 2V
V_RNG = 1V
V_RNG = 0.6V
0.4 0.8 1.2 1.6 2 2.4
ITH VOLTAGE (V)
3876 G30
TRACK/SS Pull-Up Current
vs Temperature
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3876 G33
Quiescent Current Into V_IN Pin
vs Temperature with EXTV_CC = 0V
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3876 G36
3876f
9