Chip topography – Rainbow Electronics MAX747 User Manual
Page 12
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.
12
__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 1993 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX747
High-Efficiency PWM, Step-Down
P-Channel DC-DC Controller
Additional Notes
When probing the MAX747 circuit, avoid shorting AV+
to GND (the two pins are adjacent to each other) as
this may cause the IC to malfunction due to large
ground currents. Also, the MAX747 may continue to
operate with AV+ disconnected, but erratic switching
waveforms will appear at EXT. Finally, due to its fast
switching and high drive capability requirements, EXT
is a low-impedance point that is not short-circuit
protected. Therefore, do not short EXT to any node
(including AGND and V+, which are adjacent to EXT)
to prevent damaging the device.
SUPPLIER
PHONE
FAX
INDUCTORS
Coiltronics
(305) 781-8900
(305) 782-4163
Sumida USA
(708) 956-0666
(708) 956-0702
Sumida Japan
81-3-3607-511
81-3-3607-5428
CAPACITORS
Kemet
(803) 963-6300
(803) 963-6322
Matsuo
(714) 969-2491
(714) 960-6492
Nichicon
(708) 843-7500
(708) 843-2798
Sprague
(603) 224-1961
(603) 224-1430
Sanyo USA
(619) 661-6322
Sanyo Japan
81-3-3837-6242
United Chemi-Con
(714) 255-9500
(714) 255-9400
DIODES
Motorola
(800) 521-6274
Nihon USA
(805) 867-2555
(805) 867-2698
Nihon Japan
81-3-3494-7411
81-3-3494-7414
POWER TRANSISTORS
Harris
(407) 724-3739
(407) 724-3937
International Rectifier
(213) 772-2000
(213) 772-9028
Siliconix
(408) 988-8000
(408) 727-5414
RESISTORS
IRC
(512) 992-7900
(512) 992-3377
Gowanda
(716) 532-2234
(716) 532-2702
Table 1. Component Suppliers
___________________Chip Topography
V+
AGND
EXT
SS
REF
SHDN
LBI LBO GND
CS
OUT
CC
FB
AV+
0.130"
(3.30mm)
0.080"
(2.03mm)
MAX747
SUBSTRATE CONNECTED TO V+;
TRANSISTOR COUNT: 508.