AT73C224-A Datasheet, PDF (7/75 Pages) ATMEL Corporation – Power Management and Analog Companions (PMAAC)

AT73C224
Figure 4-3. Application Schematic 3: BOOST in SEPIC Configuration (BUCK/BOOST)
Rechargeable
Backup
Battery
(NBL type)
R2
C11
X1
32
uP uP uP
VO4
C12
V_BAT
C4 C9
1
V_BAT
C3 C8
VO3
VDD3
GNDANA
VO4
VDD4
VDD1
nc VCAPP
VSENSE1
C14
V_BAT
C5
VINT
VDD0
nc VCAPN
AT73C224-B
DL1
DH1 nc
VO1
VBG
C10
GND2
V_BAT
3V
to
4.2V
Li_Ion
Battery
V_BAT
C7
V_BAT
C13
uP uP uP
BUTTON
L2
GND/AVSS
Die
Paddle
VO2
C2
C16
BOOST1 = 3.3V
Analog Cells
LDO4 = 1.8V
VDDIO
V_{BAT C6}
R1
L1
C15
D1
VO1
C1
Q1
L3
BOOST1 = 3.3V
Microcontroller
BUCK2 = 1.2V
VCORE
SPI / TWI
POK ITB/RDY D1 D2 D3 D4
In the Application Schematic 3, the BOOST (VO1) is in SEPIC configuration (BUCK/BOOST)
and generates a 3.3V output voltage for analog cells. The BUCK (VO2) supplies the core of the
microcontroller, and LDO4 supplies the I/Os.
Note that, in the SEPIC configuration, the maximum load current on VO1 should not exceed 300
mA.
For external components, see Table 4-1.
7
6266A–PMAAC–08-Sep-08