Datasheet

0
100 200 300 400 500 600
LOAD CURRENT (mA)
50
60
70
80
90
100
EFFICIENCY (%)
V
IN
= 8V
12V
30V
V
IN
(V)
5
8 10 15 20 25 30
350
300
250
200
150
FREQUENCY (kHz)
Load Curent = 400 mA
FB
SW
L1
R1
2.5k
LM2694
BST
VCC
C3
C4
D1
V
OUT
ISEN
SGND
SS
RTN
0.1 PF
5V
GND
0.022 PF
R2
2.5k
R3
1.5
C2
22 PF
C6
0.022 PF
C1
3.3 PF
C5
0.1 PF
R
ON
140k
150 PH
8V - 30V
Input
VIN
RON/SD
LM2694
SNVS444A –MAY 2006–REVISED APRIL 2013 www.ti.com
FINAL CIRCUIT
The final circuit is shown in Figure 14, and its performance is shown in Figure 15 and Figure 16. Current limit
measured approximately 0.64A.
Figure 14. Example Circuit
Item Description Value
C1 Ceramic Capacitor 3.3 µF, 50V
C2 Ceramic Capacitor 22 µF, 16V
C4, C6 Ceramic Capacitor 0.022 µF, 16V
C3, C5 Ceramic Capacitor 0.1 µF, 50V
D1 Schottky Diode 60V, 1A
L1 Inductor 150 µH
R1 Resistor 2.5 kΩ
R2 Resistor 2.5 kΩ
R3 Resistor 1.5 Ω
R
ON
Resistor 140 kΩ
U1 TI Semi LM2694
Figure 15. Efficiency vs Load Current and V
IN
Figure 16. Frequency vs V
IN
Circuit of Figure 14 Circuit of Figure 14
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