MXL1076 [ETC]
5A/2A.Step-Down.PWM.Switch-Mode DC-DC Regulators ; 5A / 2A.Step - Down.PWM.Switch模式DC- DC稳压器\n
| 型号： | MXL1076 |
| 厂家： | 
ETC |
| 描述： | 5A/2A.Step-Down.PWM.Switch-Mode DC-DC Regulators
|
| 文件： | 总4页 (文件大小：44K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0102; Rev 3; 9/95
5 A/2 A S t e p -Do w n , P WM,
S w it c h -Mo d e DC-DC Re g u la t o rs
4/MXL1076
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ Input Range: Up to 40V
The MXL1074/MXL1076 are monolithic, bipolar, pulse-
width 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 exter-
nal 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.
♦ 5A On-Chip Power Switch (MXL1074)
2A On-Chip Power Switch (MXL1076)
♦ Adjustable Output: 2.5V to 35V
♦ 100kHz Switching Frequency
♦ Excellent Dynamic Characteristics
♦ Few External Components
♦ 8.5mA Quiescent Current
♦ TO-220 Package
The regulators have excellent dynamic and transient-
response 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.
______________Ord e rin g In fo rm a t io n
PART
MXL1074CT
MXL1074ET
MXL1076CT
MXL1076ET
TEMP. RANGE
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
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.
5 TO-220
5 TO-220
___________________P in Co n fig u ra t io n
FRONT VIEW
________________________Ap p lic a t io n s
5
V
IN
Distributed Power from High-Voltage Buses
High-Current, High-Voltage Step-Down Applications
High-Current Inverter
V
4
3
2
1
SW
MXL1074
MXL1076
GND
FB
V
C
Negative Step-Up Converter
5-PIN TO-220
Multiple-Output Step-Down Converter
Isolated DC-DC Conversion
CASE IS CONNECTED TO GROUND. STANDARD PACKAGE HAS
STAGGERED LEADS. CONTACT FACTORY FOR STRAIGHT LEADS.
__________________________________________________Typ ic a l Op e ra t in g Circ u it s
INPUT
8V TO 40V
OUTPUT
5V AT 2A
INPUT
8V TO 40V
OUTPUT
5V AT 5A
100µH
50µH
V
IN
V
SW
V
IN
V
SW
220µF
220µF
MXL1076
GND
MXL1074
GND
MBR745
2.8k
MBR745
2.8k
V
C
FB
470µF
V
C
FB
470µF
2.21k
2.21k
2.7k
2.7k
0.01µF
0.01µF
5A STEP-DOWN CONVERTER
2A STEP-DOWN CONVERTER
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .
5 A/2 A S t e p -Do w n , P WM,
S w it c h -Mo d e DC-DC Re g u la t o rs
ABSOLUTE MAXIMUM RATINGS
Input Voltage ..........................................................................45V
Switch Voltage with Respect to Input Voltage .......................50V
Junction Temperature Ranges
MXL1074CT/MXL1076CT .................................0°C to +125°C
MXL1074ET/MXL1076ET ...............................-40°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Switch Voltage with Respect to Ground Pin (V negative)
SW
(Note 1) ..............................................................................35V
Feedback Pin Voltage ...............................................-0.3V, +10V
Operating Temperature Ranges
MXL1074CT/MXL1076CT ...................................0°C to +70°C
MXL1074ET/MXL1076ET .................................-40°C to +85°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
(V = 25V, T = T
to T , unless otherwise noted.)
MAX
IN
j
MIN
PARAMETER
CONDITIONS
UNITS
MIN
TYP
MAX
4/MXL1076
Input Supply Voltage Range
Switch-On Voltage (Note 2)
V
8.0
40.0
1.85
T ≥ 0°C
j
I
= 1A
SW
T < 0°C
j
2.10
2.30
2.50
1.2
MXL1074
T ≥ 0°C
j
I
= 5A
V
SW
T < 0°C
j
I
= 0.5A
= 2A
SW
MXL1076
MXL1074
MXL1076
I
1.7
SW
V
≤ 25V, V = 0V
T = +25°C
j
5
300
IN
SW
V
= 40V, V = 0V
T = +25°C
j
10
500
150
250
IN
SW
Switch-Off Leakage
µA
V
≤ 25V, V = 0V
T = +25°C
j
IN
SW
V
= 40V, V = 0V
T = +25°C
j
IN
SW
Supply Current (Note 3)
Minimum Supply Voltage
V
= 2.5V, V ≤ 40V
8.5
7.3
3.5
3.5
6.5
2.6
90
11
8.0
4.8
5.0
8.5
3.2
mA
V
FB
IN
Normal Mode
T ≥ 0°C
j
Start-Up Mode (Note 4)
T < 0°C
j
MXL1074
MXL1076
5.5
2
Switch-Current Limit (Note 5)
Maximum Duty Cycle
A
85
90
85
%
T = +25°C
j
100
110
120
Switching Frequency
T ≤ +125°C
j
kHz
V
FB
= grounded through 2kΩ (Note 5) T = +25°C
20
j
Switching Frequency Line
Regulation
8V ≤ V ≤ 40V
0.03
0.1
%/V
IN
2
_______________________________________________________________________________________
5 A/2 A S t e p -Do w n , P WM,
S w it c h -Mo d e DC-DC Re g u la t o rs
4/MXL1076
ELECTRICAL CHARACTERISTICS (continued)
(V = 25V, T = T
to T , unless otherwise noted.)
MAX
IN
j
MIN
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Error-Amplifier Voltage Gain
1V ≤ V ≤ 4V
T = +25°C
j
2000
V/V
C
Error-Amplifier
Transconductance
T = +25°C
j
3000
5000
9000
µmho
Error-Amplifier Source Current
Error-Amplifier Sink Current
Feedback Pin Bias Current
Reference Voltage
V
= 2V
T = +25°C
j
100
0.6
140
1.0
225
1.7
µA
mA
µA
V
FB
V
FB
= 2.5V
= VREF
T = +25°C
j
V
FB
0.5
2
V
C
= 2V
2.155
2.210
2.265
VREF (nominal) = 2.21V
T = +25°C
±0.5
±1
±1.5
±2.5
j
Reference Voltage Tolerance
%
All conditions of input voltage, output voltage,
temperature and load current
Reference Voltage Line
Regulation
8V ≤ V ≤ 40V
0.005
1.5
0.02
%/V
V
IN
T = +25°C
j
V
C
Voltage at 0% Duty Cycle
T = T
j
MIN
-4
mV/°C
to T
MAX
MXL1074
MXL1076
2.5
4.0
Thermal Resistance Junction
to Case (Note 6)
°C/W
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 V pin is forced to its low clamp level and the switch duty cycle is forced to
C
zero, approximating the zero load condition.
Note 4: For proper regulation, total voltage from V to ground must be ≥8V after start-up.
IN
Note 5: To avoid extremely short switch-on times, the switch frequency is internally scaled down when V is less than 1.3V. Switch
FB
current limit is tested with V adjusted to give a 1µs minimum switch-on time.
FB
Note 6: Guaranteed, not production tested.
_______________________________________________________________________________________
3
5 A/2 A S t e p -Do w n , P WM,
S w it c h -Mo d e DC-DC Re g u la t o rs
________________________________________________________P a c k a g e In fo rm a t io n
INCHES
MILLIMETERS
DIM
A
MIN
MAX
0.190
0.040
0.022
0.650
0.420
MIN
3.56
0.38
0.41
14.23
9.66
MAX
4.82
E
F
A
B
0.140
0.015
φP
1.01
Q
C1 0.014
0.50
H1
D
E
e
0.560
0.380
16.51
10.66
0.067 BSC
1.70 BSC
D
F
0.045
0.055
0.270
0.115
0.185
0.335
0.200
0.340
0.720
0.161
0.120
1.14
5.85
2.04
4.32
8.31
4.32
6.60
17.78
3.54
2.54
1.39
6.85
2.92
4.70
8.51
5.08
8.64
18.29
4.08
H1 0.230
L2
J1
J2
J3
L
0.080
0.170
0.327
0.170
0.260
0.700
J1
L1
L2
φP 0.139
4/MXL1076
Q
0.100
3.04
21-005-
L
L1
J2
5-PIN TO-220
(STAGGERED LEAD)
PACKAGE
C1
B
e
J3
INCHES
MILLIMETERS
DIM
MIN
MAX
0.190
0.040
0.022
0.650
0.420
MIN
3.56
0.38
0.41
14.23
9.66
MAX
4.82
A
E
A
B
0.140
0.015
F
1.01
φP
Q
C1 0.014
0.50
D
E
e
0.560
0.380
16.51
10.66
H1
0.067 BSC
1.70 BSC
F
0.045
0.055
0.270
0.115
0.580
0.161
0.120
1.14
5.85
2.04
12.70
3.54
2.54
1.39
6.85
D
H1 0.230
J1
L
0.080
0.500
2.92
14.73
4.08
φP 0.139
0.100
Q
3.04
21-4737-
J1
L
5-PIN TO-220
(STRAIGHT LEAD)
PACKAGE
B
C1
e
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
___________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 (4 0 8 ) 7 3 7 -7 6 0 0
© 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products
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