LM43601-Q1_15 Datasheet, PDF (37/51 Pages) Texas Instruments – LM43601-Q1 SIMPLE SWITCHER 3.5 V to 36 V 1 A Synchronous Step-Down Voltage Converter

www.ti.com
LM43601-Q1
SNVSAA0A – JULY 2015 – REVISED AUGUST 2015
Please refer to Table 2 for Bill of materials for each V_OUT and F_S combination. Unless otherwise stated, application
performance curves were taken at T_A = 25 °C.
90
V_OUT = 5 V F_S = 2.2 MHz
80
70
RT
17.8
kŸ
CVCC
2.2 µF
RT ^{LM43601-Q1 SW}
CBOOT
L=6.8 µH
CBOOT
0.47 µF
VOUT
COUT
22 µF
BIAS
CBIAS
CFF
RFBT
VCC
1 µF
18 pF ^{1 MŸ}
FB
RFBB
255
kŸ
V_OUT = 5 V
F_S = 1 MHz
V_IN = 12 V
60
50
40
30
20
10
0
0.001
V_OUT = 5 V
0.010
0.100
Load Current (A)
F_S = 2.2 MHz
VIN = 12V
1.000
C006
V_IN = 12 V
Figure 77. BOM for V_OUT = 5 V F_S = 2.2 MHz
Figure 78. Efficiency
5.20
5.2
5.15
5.0
5.10
4.8
5.05
5.00
4.6
4.95
4.90
4.85
4.80
0.001
V_OUT = 5 V
0.010
0.100
Load Current (A)
F_S = 2.2 MHz
VIN = 12V
1.000
C016
4.4
4.2
4.0
5.0
V_OUT = 5 V
5.5
6.0
VIN (V)
F_S = 2.2 MHz
Load = 0.25A
Load = 0.5A
Load = 0.75A
Load = 1A
6.5
C026
Figure 79. Output Voltage Regulation
Figure 80. Drop-Out Curve
1.2
VDROP_ON_0.75Ÿ_LOAD
1
(750 mV/DIV)
0.8
VOUT (200 mV/DIV)
0.6
IL (1 A/DIV)
Time (200 µs/DIV)
V_OUT = 5 V
F_S = 2.2 MHz
V_IN = 12 V
Figure 81. Load Transient Between 0.1 A and 1 A
0.4
R,JA = 10 SC/W
0.2
R,JA = 20 SC/W
R,JA = 30 SC/W
0
50 60 70 80 90 100
Temperature (SC)
V_OUT = 5 V
F_S = 2.2 MHz
110 120
C001
V_IN = 12 V
Figure 82. Derating Curve
Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: LM43601-Q1
Submit Documentation Feedback
37