5V/3.3V/3V 5A Step-Down / PWM / Switch-Mode DC-DC Regulators
Description
19-0182; Rev 3; 9/95
5V/3.
3V/3V 5A Step-Down, PWM, Switch-Mode DC-DC Regulators
_______________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.
___________________________Features
o Input Range: Up to 40V o 5A On-Chip Power Switch o Fixed Outputs: 5V (MAX787) 3.
3V (MAX788) 3V (MAX789) o 100kHz Switching Frequency o Excellent Dynamic Characteristics o Few External Components o 8.
5mA Quiescent Current o TO-220 Package
MAX787/MAX788/MAX789
______________Ordering Information
PART MAX787CCK MAX787ECK MAX788CCK MAX788ECK MAX789CCK MAX789ECK 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 Multiple-Output Buck Converter
___________Product Selection Guide
PART MAX724 MAX726 MAX727 VOUT (V) Adjustable Adjustable 5 3.
3 3 5 3.
3 3 IOUT MAX (A) 5 2 2 2 2 5 5 5
__________Typical Operating Circuit
MAX728 MAX729 MAX787 MAX788
INPUT 8V TO 40V VIN 220µF VSW
50µH
OUTPUT 5V AT 5A
MAX789
__________________Pin Configuration
FRONT VIEW
MAX787...
Similar Datasheet
