Hig h -Effic ie n c y, P WM, S t e p -Do w n
DC-DC Co n t ro lle rs in 1 6 -P in QS OP
2–MAX165
BATTERY VOLTAGE
TO
V+
CSL
+5V LINEAR
REGULATOR
OUT
VL
+5V AT 5mA
4.5V
AUXILIARY
OUTPUT
SHDN
BST
SECFB
DH
LX
PWM
LOGIC
MAIN
OUTPUT
DL
+2.50V
REF
PGND
PWM
COMPARATOR
CSH
CSL
+2.50V
AT 100µA
REF
LPF
GND
3.3V FB
5V FB
12kHz
ON/OFF
SHDN
SS
ADJ FB
FB
MAX1652
MAX1653
MAX1654
MAX1655
4V
1V
SYNC
Figure 2. MAX1652–MAX1655 Functional Diagram
______________________________________________________________________________________ 13