MAX747 Maxim, MAX747 Datasheet - Page 12

• Manufacturer Part Number: MAX747
• Description: High-Efficiency PWM / Step-Down P-Channel DC-DC Controller
• Manufacturer: Maxim

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 [phone]
© 1993 Maxim Integrated Products
High-Efficiency PWM, Step-Down
P-Channel DC-DC Controller
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.
Table 1. Component Suppliers
INDUCTORS
CAPACITORS
DIODES
POWER TRANSISTORS
RESISTORS
Coiltronics
Gowanda
Sumida USA
Sumida Japan
Kemet
Matsuo
Nichicon
Sprague
Sanyo USA
Sanyo Japan
United Chemi-Con
Motorola
Nihon USA
Nihon Japan
Harris
International Rectifier
Siliconix
IRC
SUPPLIER
[phone]
[phone]
[phone]
81-3-3607-511
[phone]
[phone]
[phone]
[phone]
[phone]
81-3-3837-6242
[phone]
[phone]
[phone]
81-3-3494-7411
[phone]
[phone]
[phone]
[phone]
PHONE
Additional Notes
Printed USA
[phone]
[phone]
[phone]
81-3-3607-5428
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
81-3-3494-7414
[phone]
[phone]
[phone]
[phone]
FAX
___________________Chip Topography
SHDN
REF
SUBSTRATE CONNECTED TO V+;
TRANSISTOR COUNT: 508.
SS
is a registered trademark of Maxim Integrated Products.
FB
CC
LBI LBO GND
(2.03mm)
MAX747
0.080"
AV+
OUT
CS
V+
EXT
AGND
(3.30mm)
0.130"