Rainbow Electronics MAX1771 - Manual (Page 16)

MAX1771
12V or Adjustable, High-Efficiency,
Low I
Q , Step-Up DC-DC Controller
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
___________________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
7 6
1N5820
330 µF
0.1 µF
4
5
1
8
2
3
OUTPUT
5V
1A
0.1 µF 232k Ω
100k Ω
0.04 Ω
150 µF
22 µH
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