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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX729 Datasheet

5V/3.3V/3V 5A Step-Down / PWM / Switch-Mode DC-DC Regulators

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MAX729 pdf
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.
_______________________Applications
Distributed Power from High-Voltage Buses
High-Current, High-Voltage Step-Down
Multiple-Output Buck Converter
__________Typical Operating Circuit
INPUT
8V TO 40V
220µF
VIN VSW
MAX787
VC SENSE
2.7k
0.01µF
GND
50µH
OUTPUT
5V AT 5A
MBR745
470µF
___________________________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
______________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
___________Product Selection Guide
PART
MAX724
MAX726
MAX727
MAX728
MAX729
MAX787
MAX788
MAX789
VOUT (V)
Adjustable
Adjustable
5
3.3
3
5
3.3
3
IOUT MAX (A)
5
2
2
2
2
5
5
5
__________________Pin Configuration
FRONT VIEW
MAX787
MAX788
MAX789
5
4
3
2
1
VIN
VSW
GND
VC
SENSE
STEP-DOWN CONVERTER
5-PIN TO-220
CASE IS CONNECTED TO GROUND. STANDARD PACKAGE HAS STAGGERED LEADS.
CONTACT FACTORY FOR STRAIGHT LEADS.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX729 Datasheet

5V/3.3V/3V 5A Step-Down / PWM / Switch-Mode DC-DC Regulators

No Preview Available !

MAX729 pdf
5V/3.3V/3V 5A Step-Down, PWM,
Switch-Mode DC-DC Regulators
ABSOLUTE MAXIMUM RATINGS
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45V
Switch Voltage with Respect to Input Voltage. . . . . . . . . . . . . . . . 50V
Switch Voltage with Respect to GND Pin (VSW negative)
(Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
SENSE Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V, +10V
Operating Temperature Ranges
MAX78_CCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
MAX78_ECK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Junction Temperature Ranges
MAX78_CCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +125°C
MAX78_ECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40°C to +125°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . -65°C to +160°C
Lead Temperature (soldering, 10sec). . . . . . . . . . . . . . . . . . . . +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 25V, Tj = TMIN to TMAX, unless otherwise noted.)
PARAMETER
CONDITIONS
Input Supply Voltage Range
Switch-On Voltage (Note 1)
Switch-Off Leakage
Supply Current (Note 3)
Minimum Supply Voltage
Switch-Current Limit (Note 5)
Maximum Duty Cycle
Switching Frequency
Switching Frequency Line Regulation
Error-Amplifier Voltage Gain
Error-Amplifier Transconductance
Error-Amplifier Source Current
Error-Amplifier Sink Current
ISW = 1A
ISW = 5A
VIN = 25V, VSW = 0V
VIN = 40V, VSW = 0V
VIN 40V, VSENSE = 5.5V
Normal Mode
Start-Up Mode (Note 4)
VOUT = VSENSE = 0V (Note 5)
8V VIN 40V
1V VC 4V
VSENSE = VOUT - 10%
VSENSE = VOUT + 10%
Tj 0°C
Tj < 0°C
Tj 0°C
Tj < 0°C
Tj = +25°C
Tj = +25°C
Tj 0°C
Tj < 0°C
Tj = +25°C
Tj +125°C
Tj = +25°C
Tj = +25°C
Tj = +25°C
Tj = +25°C
Tj = +25°C
MIN
8.0
5.5
85
90
85
3000
100
0.6
TYP
5
10
8.5
7.3
3.5
3.5
6.5
90
100
20
0.03
2000
5000
140
1.0
MAX
40.0
1.85
2.10
2.30
2.50
300
500
11
8.0
4.8
5.0
8.5
110
120
UNITS
V
V
µA
mA
V
A
%
kHz
0.10
9000
225
1.7
%/V
V/V
µmho
µA
mA
2 _______________________________________________________________________________________


Part Number MAX729
Description 5V/3.3V/3V 5A Step-Down / PWM / Switch-Mode DC-DC Regulators
Maker Maxim
Total Page 4 Pages
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