Rainbow Electronics MAX729 - Manual

_______________General Description
The MAX727/MAX728/MAX729 are monolithic, bipolar,
pulse-width modulation (PWM), switch-mode, step-down
DC-DC regulators. Each is rated at 2A. 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.
These regulators have excellent dynamic and transient
response characteristics, while featuring cycle-by-cycle cur-
rent 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 2.6A. See the MAX724/
MAX726 data sheet for more applications information.
_______________________Applications
Distributed Power from High-Voltage Buses
High-Current, High-Voltage Step-Down Applications
Multiple-Output Buck Converter
MAX727/MAX728/MAX729
5V/3.3V/3V 2A 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
MAX727
MAX728
MAX729
1
2
3
4
5
__________________Pin Configuration
VIN
VC
VSW
220 µ F
GND
2.7k
0.01 µ F
OUTPUT
5V AT 2A
SENSE
100 µ H
MBR745
470 µ F
INPUT
8V TO 40V
MAX727
STEP-DOWN CONVERTER
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0149; Rev 2; 9/95
___________________________Features
♦ Input Range: Up to 40V
♦ 2A On-Chip Power Switch
♦ Fixed Outputs: 5V (MAX727)
3.3V (MAX728)
3V (MAX729)
♦ 100kHz Switching Frequency
♦ Excellent Dynamic Characteristics
♦ Few External Components
♦ 8.5mA Quiescent Current
♦ TO-220 Package
______________Ordering Information
PART
MAX727 CCK
MAX727ECK -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
5 TO-220
5 TO-220
MAX728 CCK
MAX728ECK -40°C to +85°C
0°C to +70°C 5 TO-220
5 TO-220
MAX729 CCK
MAX729ECK -40°C to +85°C
0°C to +70°C 5 TO-220
5 TO-220