TPS40422_16 Datasheet, PDF (10/71 Pages) Texas Instruments – Dual-Output or Two-Phase Synchronous Buck Controller with PMBus Interface

TPS40422
SLUSAQ4E – OCTOBER 2011 – REVISED SEPTEMBER 2016
7.5 Typical Characteristics
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4.8
601.0
4.7
600.5
4.6
600.0
4.5
599.5
4.4
599.0
4.3
Switch−over Enabled
598.5
V_DD = 12 V
V_DD = 20 V
Switch−over Disabled
V_DD = 4.5 V
4.2
−40 −25 −10 5 20 35 50 65 80 95 110 125
598.0
−40 −25 −10 5 20 35 50 65 80 95 110 125
Junction Temperature (°C)
G000
Junction Temperature (°C)
G001
.
.
Figure 1. BPEXT Switch-over Voltage vs. Junction
Figure 2. Reference Voltage vs. Junction Temperature
Temperature
1.80
1.6
1.60
1.4
1.40
1.2
1.20
1
1.00
0.8
0.80
0.60
−40 −25 −10 5
R_HDHI
R_HDLO
20 35 50 65 80 95 110 125
Junction Temperature (°C)
G002
.
.
Figure 3. High-Side Driver Resistance vs. Junction
Temperature
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
−40 −25 −10 5
V_DD = 12 V
V_DD = 20 V
V_DD = 4.5 V
20 35 50 65 80 95 110 125
Junction Temperature (°C)
G004
.
.
Figure 5. Non-Switching Quiescent Current vs. Junction
Temperature
0.6
0.4
−40 −25 −10
5 20 35 50 65 80
Junction Temperature (°C)
R_LDHI
R_LDLO
95 110 125
G003
Figure 4. Low-Side Driver Resistance vs. Junction
Temperature
540
530
520
510
V_DD = 12 V
V_DD = 20 V
500
−40 −25 −10 5 20 35 50 65 80
Junction Temperature (°C)
R_T = 40 kΩ
95 110 125
G005
Figure 6. Switching Frequency vs. Junction Temperature
10
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