Datasheet

MAX1771
12V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controller
16
______________________________________________________________________________________
___________________Chip Topography
V+
FB
0.126"
(3.200mm)
0.080"
(2.032mm)
EXT
CS
GND
AGND
SHDN REF
TRANSISTOR COUNT: 501
SUBSTRATE CONNECTED TO V+
100
50
1m 10m 100m 1


EFFICIENCY vs. LOAD CURRENT
60
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 3V

MAX1771


GND
76




1N5820
330µF
0.1µF
4
5
1
8
2
3
OUTPUT
5V
1A
0.1µF
232k
100k
0.04Ω
150µF
22µH
MTD20N03HDL
INPUT
2.7V TO 5.5V
CS
EXT
V+
FB
100pF
AGND
SHDN
REF
OFF
ON
V
IN
= 4V
Figure 9. 5V/1A Boost Converter