Rainbow Electronics MAX789 - Manual

___________Product Selection Guide
_______________General Description
The MAX787/MAX788/MAX789 are monolithic, bipolar,
pulse-width modulation (PWM), switch-mode, step-down
DC-DC regulators. Each is rated at 5A. Very few external
components are needed for standard operation because
the power switch, oscillator, feedback, and control circuitry
are all on-chip. Employing a classic buck topology, these
regulators perform high-current step-down functions.
The MAX787/MAX788/MAX789 have excellent dynamic
and transient response characteristics, while featuring
cycle-by-cycle current limiting to protect against overcurrent
faults and short-circuit output faults. They also have a wide
8V to 40V input range.
Each regulator is available in a 5-pin TO-220 package.
These devices have a preset 100kHz oscillator frequency
and a preset current limit of 6.5A. See the MAX724/
MAX726 data sheet for more applications information.
_______________________Applications
Distributed Power from High-Voltage Buses
High-Current, High-Voltage Step-Down
Multiple-Output Buck Converter
MAX787/MAX788/MAX789
5V/3.3V/3V 5A Step-Down, PWM,
Switch-Mode DC-DC Regulators
________________________________________________________________ Maxim Integrated Products 1
V IN
V SW
GND
V C
SENSE
CASE IS CONNECTED TO GROUND. STANDARD PACKAGE HAS STAGGERED LEADS.
CONTACT FACTORY FOR STRAIGHT LEADS.
5-PIN TO-220
FRONT VIEW
MAX787
MAX788
MAX789
1
2
3
4
5
__________________Pin Configuration VIN
VC
VSW
220 µ F
GND
2.7k
0.01 µ F
OUTPUT
5V AT 5A
SENSE
50 µ H
MBR745
470 µ F
INPUT
8V TO 40V
MAX787
STEP-DOWN CONVERTER
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0182; Rev 3; 9/95
___________________________Features
♦ Input Range: Up to 40V
♦ 5A On-Chip Power Switch
♦ Fixed Outputs: 5V (MAX787)
3.3V (MAX788)
3V (MAX789)
♦ 100kHz Switching Frequency
♦ Excellent Dynamic Characteristics
♦ Few External Components
♦ 8.5mA Quiescent Current
♦ TO-220 Package
______________Ordering Information
PART V OUT (V) I OUT MAX (A)
MAX724 Adjustable 5
MAX728 3.3 2
MAX726 Adjustable 2
MAX727 5 2
MAX787 5 5
MAX788 3.3 5
MAX789 3 5
MAX729 3 2
PART
MAX787 CCK
MAX787ECK
MAX788 CCK
MAX788ECK
-40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
5 TO-220
5 TO-220
-40°C to +85°C
0°C to +70°C 5 TO-220
5 TO-220
MAX789 CCK
MAX789ECK -40°C to +85°C
0°C to +70°C 5 TO-220
5 TO-220