AT73C203_14 Datasheet, PDF (74/106 Pages) ATMEL Corporation – Power Management

RAIL1 DC/DC Converter
1.20V, 1.2A
Rail1 is a programmable buck DC/DC converter dedicated to the application processor
core supply. The default voltage is 1.20V. Three other values can be programmed:
1.3V, 1.1V and 1.5V.
An external pin can select 1.75V (SELDC175) output voltage with tuning: 1.80V, 1.70V
and 1.65V. The entire cell is optimized for 1.20V.
When the cell is off, the output is pulled to ground.
The application processor can change the output voltage, as stated above, via registers
accessible by the SPI.
Figure 17. Rail1 Schematic
Seldc175
DC/DC Converter
1.2 V, 1.2A
Trim dc1[1:0]
On dc1
Clk_dc1
VDDPSU1
DCSENSE1
DL1
DL1
VOUT1
R1
C1
L1
T4
C2
Table 11. Rail1 External Components
Schematic Reference
C1
C2
L1
R1
T4
Reference
22 µF Ceramic capacitor
47 µF tantalum low ESR TPSW476M010R0150 capacitor or equivalent
4.7 µH: SMT3106-471M (Gowanda)
100 mΩ ± 2% 250 mW
Si5513DC
74 _AT73C203
2742B–PMGMT–03/04