Rainbow Electronics MAX1567 - Manual (Page 24)

MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
24 ______________________________________________________________________________________
CURRENT-
MODE UP
OR DOWN
PWM
PVM
LXM
L3
PGM
MAX1566
MAX1567
(PARTIAL)
FBM
SUSD
SDOK
3.3V
TO
CPU
V M
+3.3V
TO
V
BATT
CURRENT-
MODE
STEP-
DOWN
PWM
PVSD
LXSD
L4
PGSD
FBSD
V SD
+1.8V
350mA
Figure 15. Using SDOK to Drive External PFET that Gates 3.3V Power to CPU After 1.8V Core Voltage Is in Regulation
MAX1566
MAX1567
(PARTIAL) MAX1801
TO BATT
DL
FB
COMP
GND
REF
OSC
IN
DCON
PVSU
OSC
REF
V OUT
Figure 14. Adding a PWM Channel with an External MAX1801
Slave Controller
Q1
C2
D1
R1
OUTPUT
3.3V
L1
R2
V SU
PV PVSU
PART OF
MAX1566
MAX1567
(PARTIAL)
DL_
FB_
INPUT
1-CELL
Li+
L2
Figure 13. SEPIC Converter Additional Boost-Buck Channel