LTC3876_15 Datasheet, PDF (8/48 Pages) Linear Technology – Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and 50mA VTT Reference

LTC3876
TYPICAL PERFORMANCE CHARACTERISTICS
Output Regulation vs Input Voltage
VDDQ Channel 1
0.2
0.1
0
–0.1
V_OUT = 1.5V
I_LOAD = 5A
V_OUT NORMALIZED AT V_IN = 15V
–0.2
0 5 10 15 20 25 30
V_IN (V)
35 40
3876 G19
CLKOUT/Switching Frequency
vs Input Voltage
2
Output Regulation vs Load Current
VDDQ Channel 1
0.2
0.1
0
–0.1
V_IN = 15V
V_OUT = 1.5V
V_OUT NORMALIZED AT I_LOAD = 4A
–0.2
0
2
4
6
8
I_LOAD (A)
10
3876 G20
CLKOUT/Switching Frequency
vs Load Current
2
Output Regulation vs Temperature
VDDQ Channel 1
0.6
0.4
0.2
0
–0.2
V_IN = 15V
–0.4 VOUT = 1.5V
I_LOAD = 0A
–0.6 ^{VOUT NORMALIZED AT TA = 25°C}
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3876 G21
CLKOUT/Switching Frequency
vs Temperature
2
1
1
1
0
0
0
–1 V_OUT = 1.6V
I_LOAD = 5A
f = 200kHz
FREQUENCY NORMALIZED AT V_IN = 15V
–2
0 5 10 15 20 25 30 35 40
V_IN (V)
3876 G22
VTTR Load Regulation
VDDQ = 2.5V
0.520
V_IN = 15V
0.515 ^{f = 400kHz}
0.510
–40°C
25°C
85°C
125°C
0.505
0.500
0.495
0.490
0.485
0.480
–50
–25
0
25
50
I_VTTR (mA)
3876 G24
8
–1 _{VIN = 15V}
V_OUT = 1.5V
f = 200kHz
FREQUENCY NORMALIZED AT I_LOAD = 4A
–2
0
2
4
6
8
10
I_LOAD (A)
3876 G23
VTTR Load Regulation
VDDQ = 1.5V
0.520
V_IN = 15V
0.515 ^{f = 400kHz}
0.510
–40°C
25°C
85°C
125°C
0.505
0.500
0.495
0.490
0.485
0.480
–50
–25
0
25
50
I_VTTR (mA)
3876 G26
–1
V_IN = 15V, V_OUT = 1.5V
I_LOAD = 0A, f = 200kHz
FREQUENCY NORMALIZED AT T_A = 25°C
–2
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3876 G24
VTTR Load Regulation
VDDQ = 1V
0.520
V_IN = 15V
0.515 ^{f = 400kHz}
0.510
–40°C
25°C
85°C
125°C
0.505
0.500
0.495
0.490
0.485
0.480
–50
–25
0
25
50
I_VTTR (mA)
3876 G27
3876f