Datasheet

C
SS
PVIN
AVIN
EN
SS
SGND
PGND
SNS
SW
LM2852
+
V
OUT
= 1.8V
I
LOAD
= 0A to 2A
L
O
C
IN
V
IN
= 3.3V
C
f
R
f
C
INX
C
O
U
1
LM2852
www.ti.com SNVS325D –JANUARY 2005–REVISED APRIL 2013
2. All ground connections must be tied together. Use a broad ground plane, for example a completely filled
back plane, to establish the lowest resistance possible between all ground connections.
3. The sense pin connection should be made as close to the load as possible so that the voltage at the load is
the expected regulated value. The sense line should not run too close to nodes with high EMI (such as the
switch node) to minimize interference.
4. The switch node connections should be low resistance to reduce power losses. Low resistance means the
trace between the switch pin and the inductor should be wide. However, the area of the switch node should
not be too large since EMI increases with greater area. So connect the inductor to the switch pin with a short,
but wide trace. Other high current connections in the application such as PVIN and V
OUT
assume the same
trade off between low resistance and EMI.
5. Allow area under the chip to solder the entire exposed die attach pad to ground for improved thermal and
electrical performance.
LM2852 Example Circuit Schematic
Figure 15.
Table 4. Bill of Materials for 500kHz (LM2852Y) 3.3V
IN
to 1.8 V
OUT
Conversion
ID Part Number Type Size Parameters Qty Vendor
U
1
LM2852YMXA-1.8 2A Buck HTSSOP-14 1 TI
L
O
DO3316P-153 Inductor 15 µH 1 Coilcraft
C
O
* 595D107X_6R3C2T Capacitor Case Code “C” 100 µF ±20% 1 Vishay-Sprague
C
IN
GRM32ER60J476ME20B Capacitor 1210 47µF/X5R/6.3V 1 Murata
C
INX
GRM21BR71C105KA01B Capacitor 0805 1µF/X7R/16V 1 Murata
C
SS
VJ0805Y272KXXA Capacitor 0805 2.7nF ±10% 1 Vishay-Vitramon
R
f
CRCW060310R0F Resistor 0603 10Ω ±10% 1 Vishay-Dale
C
f
GRM21BR71C105KA01B Capacitor 0805 1µF/X7R/16V 1 Murata
Table 5. Bill of Materials for 1500kHz (LM2852X) 3.3V to 1.8V Conversion
ID Part Number Type Size Parameters Qty Vendor
U
1
LM2852XMXA-1.8 2A Buck HTSSOP-14 1 TI
L
0
DO1813P-102HC Inductor 1 µH 1 Coilcraft
C
0
GRM32DR61E106K Capacitor 1210 10 µF/X5R/25V 1 Murata
C
IN
GRM32ER60J476ME20B Capacitor 1210 47µF/X5R/6.3V 1 Murata
C
INX
GRM21BR71C105KA01B Capacitor 0805 1µF/X7R/16V 1 Murata
C
SS
VJ0805Y272KXXA Capacitor 0805 2.7nF ±10% 1 Vishay-Vitramon
R
f
CRCW060310R0F Resistor 0603 10Ω ±10% 1 Vishay-Dale
C
f
GRM21BR71C105KA01B Capacitor 0805 1µF/X7R/16V 1 Murata
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