LTC3838-2_15 Datasheet, PDF (8/56 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with xternal Reference Voltage and Dual Differential Output Sensing

LTC3838-2
TYPICAL PERFORMANCE CHARACTERISTICS
Output Regulation
vs Input Voltage
0.2
V_OUT = 0.6V
I_LOAD = 5A
V_OUT NORMALIZED AT V_IN = 15V
0.1
Output Regulation
vs Load Current
0.2
V_IN = 15V
V_OUT = 0.6V
V_OUT NORMALIZED AT I_LOAD = 4A
0.1
0
0
–0.1
–0.1
–0.2
0
5 10 15 20 25 30 35 40
V_IN (V)
38382 G18
Error Amplifier Transconductance
vs Temperature
1.80
1.75
1.70
1.65
1.60
1.55
1.50
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
38382 G27
t_ON(MIN)
vs V_OUT
(aVnodltta^Og^Fe^F(Mon^INS⁾ ENSE^–
Pin)
100
90
t_OFF(MIN)
80
70
60
50
t_ON(MIN)
40
30
20
10 ^VIN ^{= 38V}
R_T ADJUSTED FOR f_CLKOUT = 2MHz
0
0
1
2
3
4
5
6
V_SENSE– (V)
38382 G24
–0.2
0
2
4
6
8
10
I_LOAD (A)
38382 G19
CLKOUT/Switching Frequency
vs Input Voltage
2
1
0
–1 _{VOUT = 0.6V}
I_LOAD = 5A
f = 500kHz
FREQUENCY NORMALIZED AT V_IN = 15V
–2
0 5 10 15 20 25 30 35 40
V_IN (V)
38382 G21
t_ON(MIN) and t_OFF(MIN)
vs Voltage on V_IN Pin
100
90
t_OFF(MIN)
80
70
60
50
t_ON(MIN)
40
30
20
10 ^VOUT ^{= 0.6V}
R_T ADJUSTED FOR f_CLKOUT = 2MHz
0
0 5 10 15 20 25 30
V_IN (V)
35 40
38382 G25
8
For more information www.linear.com/3838-2
Output Regulation
vs Temperature
0.6
V_IN = 15V
V_OUT = 0.6V
0.4 _{ILOAD = 0A}
V_OUT NORMALIZED AT T_A = 25°C
0.2
0
–0.2
–0.4
–0.6
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
38382 G20
CLKOUT/Switching Frequency
vs Temperature
2
V_IN = 15V, V_OUT = 0.6V
I_LOAD = 0A
f = 500kHz
1 ^{FREQUENCY NORMALIZED AT T}A ^{= 25°C}
0
–1
–2
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
38382 G23
t_ON(MIN) and t_OFF(MIN)
vs Switching Frequency
100
90
t_OFF(MIN)
80
70
60
50
40
30
t_ON(MIN)
20
10 ^VIN ^{= 38V}
V_OUT = 0.6V
0
200 500 800
1100 1400 1700 2000
CLKOUT/SWITCHING FREQUENCY (kHz)
38382 G26
38382f