5V/3.3V/3V 5A Step-Down / PWM / Switch-Mode DC-DC Regulators - Maxim
Description
19-0149; Rev 2; 9/95
5V/3.
3V/3V 2A Step-Down, PWM, Switch-Mode DC-DC Regulators
_______________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 current limiting to protect against overcurrent faults and shortcircuit 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.
___________________________Features
o Input Range: Up to 40V o 2A On-Chip Power Switch o Fixed Outputs: 5V (MAX727) 3.
3V (MAX728) 3V (MAX729) o 100kHz Switching Frequency o Excellent Dynamic Characteristics o Few External Components o 8.
5mA Quiescent Current o TO-220 Package
MAX727/MAX728/MAX729
______________Ordering Information
PART MAX727CCK MAX727ECK MAX728CCK MAX728ECK MAX729CCK MAX729ECK TEMP.
RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE 5 TO-220 5 TO-220 5 TO-220 5 TO-220 5 TO-220 5 TO-220
_______________________Applications
Distributed Power from High-Voltage Buses High-Current, High-Voltage Step-Down Applications Multiple-Output Buck Converter
__________Typical Operating Circuit
__________________Pin Configuration
FRONT VIEW
INPUT 8V TO 40V VIN 220µF VSW
100µH
OUTPUT 5V AT 2A
MAX727
VC 2.
7k GND 0.
01µF SENSE
MBR745 470µF
MAX727 MAX728 MAX729
5 4 3 2 1
VIN VSW GND VC SENSE
5-PIN TO-220
CASE IS CONNECTED TO GROUND.
STANDARD PACKAGE HAS STAGGERED L...
Similar Datasheet
