Datasheet

FB
SW
BST
VCC
ISEN
SGND
VIN
SS
RTN
GND
A2
On
Timer
Minimum
Off
Timer
Logic
Regulation
Comparator
A3
Current Limit
Detect
GND
R5
RON/SD
V
IN
C10
C5
D1
LM34919B
C8
6V to 24V
B3
A1
D1
C6
0.022 PF
C1
1 PF
1 PF
0.1 PF
R1
28k
C2
2.5V
V
OUT
3.3V
C4
0.1 PF
C3
D3
D2
B1
C1
C9
L1 8.2 PH
R6 0:
R4
0.27:
C7
C3
R2
787:
R3
2.49k
10 PF
10 PF
OUTPUT
0.022 PF
SW
IN
Minimum Load Current www.ti.com
Figure 5. Complete Evaluation Board Schematic
Table 1. Bill of Materials (BOM)
Item Description Mfg., Part Number Package Value
C1 Ceramic Capacitor TDK C3216X7R1H105M 1206 1.0 µF, 50V
C2 Ceramic Capacitor TDK C3216X7R1H105M 1206 1.0 µF, 50V
C3 Ceramic Capacitor TDK C1608X7R1H104K 0603 0.1 µF, 50V
C4 Ceramic Capacitor TDK C1608X7R1H104K 0603 0.1 µF, 50V
C5 Ceramic Capacitor TDK C1608X7R1H223K 0603 0.022 µF, 50V
C6 Ceramic Capacitor TDK C1608X7R1H223K 0603 0.022 µF, 50V
C7, C8 Ceramic Capacitor TDK C3216X7R1C106K 1206 10 µF, 16V
C9 Ceramic Capacitor Unpopulated 0603
C10 Ceramic Capacitor Unpopulated 0603
D1 Schottky Diode Zetex ZLLS2000 SOT23-6 40V, 2.2A
L1 Power Inductor Bussman DR74-8R2–R 7.6 mm x 7.6 mm 8.2 µH, 2.5A
R1 Resistor Vishay CRCW060328KOFK 0603 28 kΩ
R2 Resistor Vishay CRCW0603787RFK 0603 787 Ω
R3 Resistor Vishay CRCW06032K49FK 0603 2.49 kΩ
R4 Resistor Panasonic ERJ3RQFR27 0603 0.27Ω
R5 Resistor Unpopulated 0603
R6 Resistor Vishay CRCW08050000Z 0805 0Ω Jumper
U1 Switching Regulator LM34919 10 Bump DSBGA
6
AN-2016 LM34919B Evaluation Board SNVA418A–May 2010–Revised April 2013
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