Datasheet

www.ti.com Maximum Output Current
Table 1. Bill of Materials (BOM)
Component Value Description Model Number
C
OUT
10 µF Output Capacitor TMK432BJ106MM (Taiyo Yuden)
C
IN
22 µF Input Capacitor LMK432BJ226MM (Taiyo Yuden)
C
C
4.7nF Compensation Capacitor VJ0805Y472MXAAT (Vishay)
C
BYP
0.1 µF Bypass Capacitor VJ0805Y104KXAAT (Vishay)
D 1A, 20 V Schottky Power Diode MBRM120LT3 (ON-Semiconductor)
L 10 µH Power Inductor CDRH6D38-100 (Sumida)
R
C
24.9k Compensation Resistor CRCW 0805 2492 FRT1 (Vishay)
R
FB1
30.1k Top Feedback Resistor CRCW 0805 3012 FRT1 (Vishay)
R
FB2
3.48k Bottom Feedback Resistor CRCW 0805 3481 FRT1 (Vishay)
Table 2. Jumper Settings
Jumper Setting Description
J1 600 kHz 600 kHz switching frequency
1.25 MHz 1.25 MHz switching frequency
J2 Run LM2698 is regulating
SD LM2698 is shutdown
3 Maximum Output Current
The current limit of the LM2698 is with respect to the switch current. This means that the maximum output
current to the load is dependent on duty cycle. With a fixed V
OUT
, the maximum output current will be a
function of V
IN
, as shown in Figure 2.
Figure 2. Maximum Output Current vs Input Voltage
3
SNVA040C–September 2001–Revised April 2013 AN-1202 LM2698 Demo Board
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