Rainbow Electronics MAX726 - Manual

_______________General Description
The MAX724/MAX726 are monolithic, bipolar, pulse-
width modulation (PWM), switch-mode DC-DC regula-
tors optimized for step-down applications. The
MAX724 is rated at 5A, and the MAX726 at 2A. Few
external components are needed for standard opera-
tion because the power switch, oscillator, and control
circuitry are all on-chip. Employing a classic buck
topology, these regulators perform high-current step-
down functions, but can also be configured as invert-
ers, negative boost converters, or flyback converters.
These regulators have excellent dynamic and transient
response characteristics, while featuring cycle-by-cycle
current limiting to protect against overcurrent faults and
short-circuit output faults. The MAX724/MAX726 also
have a wide 8V to 40V input range in the buck step-
down configuration. In inverting and boost configura-
tions, the input can be as low as 5V.
The MAX724/MAX726 are available in a 5-pin TO-220
package. The devices have a preset 100kHz oscillator
frequency and a preset current limit of 6.5A (MAX724)
or 2.6A (MAX726).
_______________________Applications
Distributed Power from High-Voltage Buses
High-Current, High-Voltage Step-Down Applications
High-Current Inverter
Negative Boost Converter
Multiple-Output Buck Converter
Isolated DC-DC Conversion
MAX724/MAX726
5A/2A Step-Down, PWM,
Switch-Mode DC-DC Regulators
________________________________________________________________ Maxim Integrated Products 1
V IN
V SW
GND
V C
FB
CASE IS CONNECTED TO GROUND.
STANDARD PACKAGE HAS STAGGERED LEADS.
CONTACT FACTORY FOR STRAIGHT LEADS.
5-PIN TO-220
FRONT VIEW
MAX724
MAX726
1
2
3
4
5
__________________Pin Configuration
V IN
V C
V SW
220 µ F
GND
2.7k
0.01 µ F
OUTPUT
5V AT 5A
FB
50 µ H
MBR745
2.21k
2.8k
470 µ F
INPUT
8V TO 40V
MAX724
5A STEP-DOWN CONVERTER
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0107; Rev 3; 9/95
___________________________Features
♦ Input Range: Up to 40V
♦ 5A On-Chip Power Switch (MAX724)
2A On-Chip Power Switch (MAX726)
♦ Adjustable Output: 2.5V to 35V
♦ 100kHz Switching Frequency
♦ Excellent Dynamic Characteristics
♦ Few External Components
♦ 8.5mA Quiescent Current
♦ TO-220 Package
______________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX724 CCK 0°C to +70°C 5 TO-220
MAX724ECK -40°C to +85°C 5 TO-220
MAX726 CCK 0°C to +70°C 5 TO-220
MAX726ECK -40°C to +85°C 5 TO-220