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19-0102; Rev 3; 9/95
5A/2A Step-Down, PWM, Switch-Mode DC-DC Regulators
_______________General Description
The MXL1074/MXL1076 are monolithic, bipolar, pulsewidth modulation (PWM), switch-mode DC-DC regulators optimized for step-down applications. The MXL1074 is rated at 5A, while the MXL1076 is rated at 2A. Few external components are needed for standard operation 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 an inverter, a negative boost converter, or a flyback converter. The regulators have excellent dynamic and transientresponse characteristics, while featuring cycle-by-cycle current limiting to protect against overcurrent faults and short-circuit output faults. The MXL1074/MXL1076 also have a wide 8V to 40V input range in the step-down configuration. In inverting and step-up configurations, the input can be as low as 5V. The MXL1074/MXL1076 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 for the MXL1074, and 2.6A for the MXL1076. The MXL1074/ MXL1076 are pin compatible with the LT1074/LT1076.
____________________________Features
o Input Range: Up to 40V o 5A On-Chip Power Switch (MXL1074) 2A On-Chip Power Switch (MXL1076) o Adjustable Output: 2.5V to 35V o 100kHz Switching Frequency o Excellent Dynamic Characteristics o Few External Components o 8.5mA Quiescent Current o TO-220 Package
MXL1074/MXL1076
______________Ordering Information
PART MXL1074CT MXL1074ET MXL1076CT MXL1076ET TEMP. RANGE 0C to +70C -40C to +85C 0C to +70C -40C to +85C PIN-PACKAGE 5 TO-220 5 TO-220 5 TO-220 5 TO-220
___________________Pin Configuration
FRONT VIEW
5 4 3 2 1 VIN VSW GND VC FB
________________________Applications
Distributed Power from High-Voltage Buses High-Current, High-Voltage Step-Down Applications High-Current Inverter Negative Step-Up Converter Multiple-Output Step-Down Converter Isolated DC-DC Conversion
MXL1074 MXL1076
5-PIN TO-220
CASE IS CONNECTED TO GROUND. STANDARD PACKAGE HAS STAGGERED LEADS. CONTACT FACTORY FOR STRAIGHT LEADS.
__________________________________________________Typical Operating Circuits
INPUT 8V TO 40V VIN 220F VC 2.7k 0.01F VSW 50H OUTPUT 5V AT 5A INPUT 8V TO 40V VIN MBR745 FB 2.21k GND 0.01F 220F 2.8k 470F 2.7k VC VSW 100H OUTPUT 5V AT 2A
MXL1074
MXL1076
FB
MBR745
2.8k 470F
2.21k GND
5A STEP-DOWN CONVERTER
2A STEP-DOWN CONVERTER 1
________________________________________________________________ Maxim Integrated Products
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5A/2A Step-Down, PWM, Switch-Mode DC-DC Regulators MXL1074/MXL1076
ABSOLUTE MAXIMUM RATINGS
Input Voltage ..........................................................................45V Switch Voltage with Respect to Input Voltage .......................50V Switch Voltage with Respect to Ground Pin (VSW negative) (Note 1) ..............................................................................35V Feedback Pin Voltage ...............................................-0.3V, +10V Operating Temperature Ranges MXL1074CT/MXL1076CT ...................................0C to +70C MXL1074ET/MXL1076ET .................................-40C to +85C Junction Temperature Ranges MXL1074CT/MXL1076CT .................................0C to +125C MXL1074ET/MXL1076ET ...............................-40C to +125C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
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 Input Supply Voltage Range ISW = 1A MXL1074 Switch-On Voltage (Note 2) ISW = 5A ISW = 0.5A ISW = 2A VIN 25V, VSW = 0V MXL1074 Switch-Off Leakage MXL1076 Supply Current (Note 3) VIN = 40V, VSW = 0V VIN 25V, VSW = 0V VIN = 40V, VSW = 0V Tj = +25C Tj = +25C Tj = +25C Tj = +25C 8.5 7.3 Tj 0C Tj < 0C 5.5 2 85 Tj = +25C Switching Frequency Tj +125C VFB = grounded through 2k (Note 5) Tj = +25C Switching Frequency Line Regulation 8V VIN 40V 90 85 20 0.03 0.1 %/V 3.5 3.5 6.5 2.6 90 100 110 120 kHz 5 10 Tj 0C Tj < 0C Tj 0C Tj < 0C CONDITIONS MIN 8.0 TYP MAX 40.0 1.85 2.10 2.30 2.50 1.2 1.7 300 500 150 250 11 8.0 4.8 5.0 8.5 3.2 A % V mA A V UNITS V
MXL1076
VFB = 2.5V, VIN 40V Normal Mode
Minimum Supply Voltage
Start-Up Mode (Note 4) MXL1074 MXL1076
Switch-Current Limit (Note 5) Maximum Duty Cycle
2
_______________________________________________________________________________________
5A/2A Step-Down, PWM, Switch-Mode DC-DC Regulators
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 25V, Tj = TMIN to TMAX, unless otherwise noted.) PARAMETER Error-Amplifier Voltage Gain Error-Amplifier Transconductance Error-Amplifier Source Current Error-Amplifier Sink Current Feedback Pin Bias Current Reference Voltage Reference Voltage Tolerance Reference Voltage Line Regulation VC Voltage at 0% Duty Cycle Thermal Resistance Junction to Case (Note 6) MXL1074 MXL1076 VFB = 2V VFB = 2.5V VFB = VREF VC = 2V VREF (nominal) = 2.21V Tj = +25C 2.155 1V VC 4V CONDITIONS Tj = +25C Tj = +25C Tj = +25C Tj = +25C 3000 100 0.6 5000 140 1.0 0.5 2.210 0.5 1 0.005 Tj = +25C Tj = TMIN to TMAX 1.5 -4 2.5 4.0 MIN TYP MAX 2000 9000 225 1.7 2 2.265 1.5 % 2.5 0.02 %/V V mV/C C/W UNITS V/V mho A mA A V
MXL1074/MXL1076
All conditions of input voltage, output voltage, temperature and load current 8V VIN 40V
Note 1: Do not exceed switch-to-input voltage limitation. Note 2: For switch currents between 1A and 5A, maximum switch on voltage can be calculated via linear interpolation. Note 3: By setting the feedback pin (FB) to 2.5V, the VC pin is forced to its low clamp level and the switch duty cycle is forced to zero, approximating the zero load condition. Note 4: For proper regulation, total voltage from VIN to ground must be 8V after start-up. Note 5: To avoid extremely short switch-on times, the switch frequency is internally scaled down when VFB is less than 1.3V. Switch current limit is tested with VFB adjusted to give a 1s minimum switch-on time. Note 6: Guaranteed, not production tested.
_______________________________________________________________________________________
3
5A/2A Step-Down, PWM, Switch-Mode DC-DC Regulators MXL1074/MXL1076
________________________________________________________Package Information
A E Q H1 P F
DIM A B C1 D E e F H1 J1 J2 J3 L L1 L2 P Q INCHES MAX MIN 0.190 0.140 0.040 0.015 0.022 0.014 0.650 0.560 0.420 0.380 0.067 BSC 0.055 0.045 0.270 0.230 0.115 0.080 0.185 0.170 0.335 0.327 0.200 0.170 0.340 0.260 0.720 0.700 0.161 0.139 0.120 0.100 MILLIMETERS MIN MAX 3.56 4.82 0.38 1.01 0.41 0.50 14.23 16.51 9.66 10.66 1.70 BSC 1.14 1.39 5.85 6.85 2.04 2.92 4.32 4.70 8.31 8.51 4.32 5.08 6.60 8.64 17.78 18.29 3.54 4.08 2.54 3.04
21-005-
D L2
J1
L L1 C1 B e J2 J3
INCHES MAX MIN 0.190 0.140 0.040 0.015 0.022 0.014 0.650 0.560 0.420 0.380 0.067 BSC 0.055 0.045 0.270 0.230 0.115 0.080 0.580 0.500 0.161 0.139 0.120 0.100
5-PIN TO-220 (STAGGERED LEAD) PACKAGE
MILLIMETERS MIN MAX 3.56 4.82 0.38 1.01 0.41 0.50 14.23 16.51 9.66 10.66 1.70 BSC 1.14 1.39 5.85 6.85 2.04 2.92 12.70 14.73 3.54 4.08 2.54 3.04
21-4737-
A E Q H1 P F
DIM A B C1 D E e F H1 J1 L P Q
D
J1
L
B
e
C1
5-PIN TO-220 (STRAIGHT LEAD) PACKAGE
CONTACT FACTORY FOR AVAILABILITY
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
4 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products

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