IR3876MPBF Datasheet, PDF (7/21 Pages) International Rectifier – 12A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR

IR3876MPBF
TYPICAL OPERATING DATA
Tested with demoboard shown in Figure 7, VIN = 12.6V, VCC = 5V, Vout = 1.05V, Fs = 300kHz, TA = 25^oC, no airflow,
unless otherwise specified
95%
85%
75%
65%
55%
45%
16V_IN
12.6V_IN
7V_IN
35%
0.01
0.1
1
10
100
Output Current (A)
Figure 1. Efficiency vs. Output Current for
VOUT = 1.05V, L = 1.2µH (2.9mΩ)
100%
90%
80%
70%
60%
50%
1.05V_OUT; L = 1.2uH, 2.9mΩ
1.5V_OUT; L = 1.2uH, 2.9mΩ
3.3V_OUT; L = 2.2uH, 4.2mΩ
40%
0.01
0.1
1
10
100
Output Current (A)
Figure 2. Efficiency vs. Output Current for
VIN = 12.6V
350
1200
5.0 Vout
4.5
300
1000
4.0
3.5
3.0
2.5
2.0
1.5
250
800
1.0
0.5
200
150
600
100
400
50
0
0
200
2
4
6
8
10
12
Output Current (A)
0
200
400
600
800
Frequency (kHz)
1000
Figure 3. Switching Frequency vs. Output
Current
Figure 4. Frequency vs. R_FF
1.058
1.057
1.056
1.055
V_OUT @ 16V_IN ^{VOUT @ 12.6VIN}
V_OUT @ 7V_IN
1.058
1.057
1.056
1.055
1.054
0
2
4
6
8
10 12
Output Current (A)
Figure 5. Output Voltage Regulation vs.
Output Current
1.054
6 7 8 9 10 11 12 13 14 15 16 17
Input Voltage (V)
Figure 6. Output Voltage Regulation vs.
Input Voltage at I_OUT = 12A
7