Datasheet
PVIN
AVIN
EN
AGND PGND
FB
SW
LM2854MHX-500
VIN
VOUT
SS
Cin1
Lf
Co1
Rfb1
Rc1
Cc1
Rfb2
Css
Cf
Rf
U1
Cin2
Rtrk
Ra
Ren1
Ren2
SS / TRK
EN
VTEST
VREF
GND
GND
+
Co2
+
1.2V, 4A
2.95V ± 5.5V
12,13
16
15
14
1,2,3,
4,8,9
10
11
5,6,7
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LM2854 Evaluation Board Schematic
4 LM2854 Evaluation Board Schematic
Figure 3. LM2854 Evaluation Board Schematic Diagram
Table 2. LM2854 500 kHz Bill of Materials, V
IN
= 2.95V to 5.5V, V
OUT
= 1.2V, I
OUT(MAX)
= 4A
Ref. Des. Function Description Case Size Manufacturer Manufacturer P/N
U1 Regulator Synchronous Buck HTSSOP-16 Texas LM2854
Regulator Instruments
Cin1 Input Filter 47 µF, X5R, 10V 1210 TDK C3225X5R1A476M
Cin2 Input Filter 150 µF, 6.3V C2 Case Panasonic 6TPE150MIC2
Co1 Output Filter 100 µF, X5R, 6.3V 1210 TDK C3225X5R0J107M
Co2 Output Filter Not Assembled C2 Case - -
Lf Output Filter 1.5 µH, 14 mΩ 6.9 x 6.5 x 3.0 Vishay IHLP2525CZER1R5M01
mm
Rfb1 Upper FB Resistor 249 kΩ 0603 Vishay Dale CRCW06032493F-e3
Rfb2 Lower FB Resistor 499 kΩ 0603 Vishay Dale CRCW06034993F-e3
Rc1 Compensation Resistor 1.0 kΩ 0603 Vishay Dale CRCW06031001F-e3
Rf AVIN Filter Resistor 1.0Ω 0603 Vishay Dale CRCW06031R0F-e3
Ren1 Enable Resistor 100 kΩ 0603 Vishay Dale CRCW06031003F-e3
Ren2 Enable Resistor Not Assembled 0603 - -
Rtrk Track Resistor 10 kΩ 0603 Vishay Dale CRCW06031002F-e3
Ra Injection Resistor 50Ω 0603 Vishay Dale CRCW06035000F-e3
Cc1 Compensation 47 pF, ±5%, C0G, 50V 0603 TDK C1608C0G1H470J
Capacitor
Css Soft-start Capacitor 10 nF, ±10%, X7R, 50V 0603 TDK C1608X7R1H103K
Cf AVIN Filter Capacitor 1.0 µF, ±10%, X7R, 16V 0603 TDK C1608X7R1C105K
TP1,TP2,TP3 Measurement Scope Probe Connector Tektronix 131-5031-00
5 LM2854 Evaluation Board Details
This application solution relates to the bill of materials shown in Table 2 and references the schematic
diagram in Figure 3 above. The board contains the LM2854MHX-500 buck regulator IC with nominal
switching frequency, f
SW
, of 500 kHz.
6 Quick Step Procedure
1. Set the power supply current limit to 3A. Turn off the power supply. Connect the power supply to the
VIN and GND terminals.
3
SNVA323B–March 2008–Revised May 2013 AN-1786 LM2854 500 kHz Buck Regulator Evaluation Board
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