MAX1566-MAX1567 Datasheet, PDF (24/35 Pages) Maxim Integrated Products – Six-Channel, High-Efficiency, Digital Camera Power Supplies

Six-Channel, High-Efficiency, Digital
Camera Power Supplies
INPUT
1-CELL
Li+
V_SU
PV PVSU
DL_
PART OF
MAX1566
MAX1567
(PARTIAL) _{FB_}
L1
L2
D1
C2
Q1
OUTPUT
3.3V
R1
R2
Figure 13. SEPIC Converter Additional Boost-Buck Channel
TO BATT
PVSU
VOUT
DL
IN
MAX1801 ^OSC
FB
COMP
GND
REF
DCON
MAX1566
MAX1567
OSC _(PARTIAL)
REF
Figure 14. Adding a PWM Channel with an External MAX1801
Slave Controller
MAX1566
MAX1567
(PARTIAL)
PVM
SUSD
CURRENT-
MODE UP
OR DOWN
PWM
L3
LXM
PGM
FBM
SDOK
V_M
+3.3V
3.3V
TO
CPU
PVSD
CURRENT-
MODE
STEP-
DOWN
PWM
LXSD
FBSD
PGSD
TO
V_BATT
L4
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
24 ______________________________________________________________________________________