LM1575-12 [NSC]
SIMPLE SWITCHER 1A STEP-DOWN VOLTAGE REGULATOR; SIMPLE SWITCHER 1A降压稳压器
| 型号： | LM1575-12 |
| 厂家： | 
National Semiconductor |
| 描述： | SIMPLE SWITCHER 1A STEP-DOWN VOLTAGE REGULATOR |
| 文件： | 总14页 (文件大小：252K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MICROCIRCUIT DATA SHEET
Original Creation Date: 08/29/95
Last Update Date: 05/22/00
MNLM1575-12-X REV 0D1
Last Major Revision Date: 08/29/95
SIMPLE SWITCHER(TM) 1A STEP-DOWN VOLTAGE REGULATOR
General Description
The LM1575 regulator is a monolithic integrated circuit that provides all the active
functions from a step-down (buck) switching regulator, capable of driving a 1A load with
excellent line and load regulation.
Requiring a minimum number of external components, this regulator is simple to use and
includes internal frequency compensation and a fixed-frequency oscillator.
The LM1575 offers a high-efficiency replacement for popular three-terminal linear
regulators. It substantially reduces the size of the heat sink, and in many cases no heat
sink is required.
A standard series of inductors optimized for use with the LM1575 are available from
several different manufacturers. This feature greatly simplifies the design of switch-mode
power supplies.
Other features include a guaranteed +4% tolerance on output voltage within specified input
voltage and output load conditions, and +10% on the oscillator frequency. External
shutdown is included, featuring 50uA (typical) standby current. The output switch includes
cycle-by-cycle current limiting, as well as thermal shutdown for full protection under
fault conditions.
Industry Part Number
NS Part Numbers
LM1575-12
LM1575J-12-QML
LM1575K-12-QML
LM1575WG-12-QML
Prime Die
LM1575-12
Controlling Document
SEE FEATURES SECTION
Processing
Subgrp Description
Temp (oC)
MIL-STD-883, Method 5004
1
Static tests at
+25
2
Static tests at
+125
-55
3
Static tests at
4
Dynamic tests at
Dynamic tests at
Dynamic tests at
Functional tests at
Functional tests at
Functional tests at
Switching tests at
Switching tests at
Switching tests at
+25
Quality Conformance Inspection
5
+125
-55
6
MIL-STD-883, Method 5005
7
+25
8A
8B
9
+125
-55
+25
10
11
+125
-55
1
MICROCIRCUIT DATA SHEET
MNLM1575-12-X REV 0D1
Features
- Adjustable version output voltage range, 1.23V to 37V +4% max over line
and load conditions
- Guaranteed 1A output current
- Requires only 4 external components
- 52KHz fixed frequency internal oscillator
- TTL shutdown capability, low power standby mode
- High efficiency
- Uses readily available standard inductors
- Thermal shutdown and current limit protection
CONTROLLING DOCUMENTS:
LM1575J-12-QML
LM1575K-12-QML
LM1575WG-12-QML
5962-9167301QEA
5962-9167301QXA
5962-9167301QZA
Applications
- Simple high-efficiency step-down (buck) regulator
- Efficient pre-regulator for linear regulators
- On-card switching regulators
- Positive to negative converted (Buck-Boost)
2
MICROCIRCUIT DATA SHEET
MNLM1575-12-X REV 0D1
(Absolute Maximum Ratings)
(Note 1)
Maximum Supply Voltage
ON/OFF Pin Input Voltage
45V
-0.3V <V< +Vin
-1V
Output Voltage to Ground
(Steady State)
Power Dissipation
(Note 2, 3)
Internally Limited
-65 C < Ta < +150 C
Storage Temperature Range
Lead Temperature
(Soldering, 10 seconds)
METAL CAN
300 C
260 C
260 C
CERDIP
CERAMIC SOIC
Maximum Junction Temperature
150 C
Thermal Resistance
ThetaJA
METAL CAN
(Still Air)
45 C/W
10 C/W
70 C/W
33 C/W
121 C/W
73 C/W
(500LF/Min Air flow)
(Still Air)
CERDIP
(500LF/Min Air flow)
CERAMIC SOIC (Still Air)
(500LF/Min Air flow)
ThetaJC
(Note 3)
METAL CAN
3.3 C/W
2.0 C/W
3.0 C/W
CERDIP (Note 3 applicable to this Pkg only)
CERAMIC SOIC
Package Weight
(Typical)
METAL CAN
CERDIP
TBD
TBD
TBD
CERAMIC SOIC
ESD Tolerance
(Note 4)
3000V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Operating Ratings indicate conditions for which the device is functional, but do not
guarantee specific performance limits. For guaranteed specifications and test
conditions, see the Electrical Characteristics. The guaranteed specifications apply
only for the test conditions listed. Some performance characteristics may degrade
when the device is not operated under the listed test conditions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is
dictated by Tjmax (maximum junction temperature), ThetaJA (package junction to
ambient thermal resistance), and TA (ambient temperature). The maximum allowable
power dissipation at any temperature is Pdmax = (Tjmax - TA)/ThetaJA or the number
given in the Absolute Maximum Ratings, whichever is lower.
3
MICROCIRCUIT DATA SHEET
MNLM1575-12-X REV 0D1
(Continued)
Note 3: The package material for these devices allows much improved heat transfer over our
standard ceramic packages. In order to take full advantage of this improved heat
transfer, heat sinking must be provided between the package base (directly beneath
the die), and either metal traces on, or thermal vias through, the printed circuit
board. Without this additional heat sinking, device power dissipation must be
calculated using junction-to-ambient, rather than junction-to-case, thermal
resistance. It must not be assumed that the device leads will provide substantial
heat transfer out of the package, since the thermal resistance of the leadframe
material is very poor, relative to the material of the package base. The stated
junction-to-case thermal resistance is for the package material only, and does not
account for the additional thermal resistance between the package base and the
printed circuit board. The user must determine the value of the additional thermal
resistance and must combine this with the stated value for the package, to calculate
the total allowed power dissipation for the device.
Note 4: Human body model, 1.5k Ohms in series with 100pF.
Recommended Operating Conditions
Temperature Range
-55 C < Ta < +125 C
Supply Voltage
40V
4
MICROCIRCUIT DATA SHEET
MNLM1575-12-X REV 0D1
Electrical Characteristics
ELECTRICAL CHARACTERISTICS: SYSTEM PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC: Vin = 25V, and Iload = 200mA.
PIN-
NAME
SUB-
SYMBOL
Vout
PARAMETER
CONDITIONS
NOTES
MIN
MAX UNIT
GROUPS
Output Voltage
1
1
1
11.88 12.12 V
11.64 12.36 V
11.52 12.48 V
1
0.2A < Iload < 1A, 15V < Vin < 40V
1
2, 3
ELECTRICAL CHARACTERISTICS: DEVICE PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC: Vin = 25V, and Iload = 200mA.
Vsat
Icl
Il
Saturation
Voltage
Iout = 1A
2
2
2
2
4
4
4
4
1.2
1.4
3.0
3.2
2
V
1
V
2, 3
1
Current Limit
Peak Current, tON < 3uS
1.7
1.3
A
A
2, 3
1
Output Leakage
Current
Vin = 35V, Output = 0V
Vin = 35V, Output = -1V
mA
mA
mA
mA
uA
uA
30
1
Iq
Quiescent Current
10
1
12
2, 3
1
Istby
Standby Quiescent ON/OFF Pin = 5V (OFF)
Current
200
500
2, 3
AC ELECTRICAL CHARACTERISTICS: DEVICE PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
AC: Vin = 25V, and Iload = 200mA.
fo
Dc
Oscillator
Frequency
47
43
93
58
62
KHz 4
KHz 5, 6
Max Duty Cycle
(ON)
3
%
9
5
MICROCIRCUIT DATA SHEET
MNLM1575-12-X REV 0D1
Electrical Characteristics
ELECTRICAL CHARACTERISTICS: ON/OFF CONTROL
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC: Vin = 25V, and Iload = 200mA.
PIN-
NAME
SUB-
SYMBOL
Vih
PARAMETER
CONDITIONS
NOTES
MIN
2.2
2.4
MAX UNIT
GROUPS
ON/OFF Pin Logic Vout = 0V
Input Level
V
1
Vih
Vil
Vil
Iih
Iil
ON/OFF Pin Logic Vout = 0V
Input Level
V
2, 3
ON/OFF Pin Logic Vout = 12V
Input Level
1.0
V
1
ON/OFF Pin Logic Vout = 12V
Input Level
0.8
30
V
2, 3
ON/OFF Pin Input ON/OFF Pin = 5V (OFF)
Current
uA
uA
1
1
ON/OFF Pin Input ON/OFF Pin = 0V (ON)
Current
10
Note 1: External components such as the catch diode, inductor, input and output capacitors
can affect switching regulator system performance.
Note 2: Output sourcing current. No diode, inductor or capacitor connected to output.
Note 3: Feedback removed from output and connected to 0V.
Note 4: Feedback removed from output and connected to 25V to force the output transistor OFF.
6
MICROCIRCUIT DATA SHEET
MNLM1575-12-X REV 0D1
Graphics and Diagrams
GRAPHICS#
DESCRIPTION
06153HRA2
06265HRB2
06379HRA1
J16ARL
METAL CAN (KA), TO-3, 4LD, LOW PROFILE (B/I CKT)
CERDIP (J), 16 LEAD (B/I CKT)
CERAMIC SOIC (WG), 16 LEAD (B/I CKT)
CERDIP (J), 16 LEAD (P/P DWG)
KA04BRA
METAL CAN (KA), TO-3, 4 LEAD, LOW PROFILE(P/P DWG)
METAL CAN (KA), TO-3, 4LD, LOW PROFILE (PINOUT)
CERDIP (J), 16 LEAD (PINOUT)
P000232A
P000371A
P000464A
WG16ARC
CERAMIC SOIC (WG), 16 LEAD (PIN OUT)
CERAMIC SOIC (WG), 16 LEAD (P/P DWG)
See attached graphics following this page.
7
+V
IN
OUTPUT
CASE IS GROUND
FEEDBACK
ON/OFF
LM1575K, LM1575HVK
4 - LEAD TO-3
CONNECTION DIAGRAM
BOTTOM VIEW
P000232A
MIL/AEROSPACE OPERATIONS
2900 SEMICONDUCTOR DRIVE
SANTA CLARA, CA 95050
V
*
*
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN
*
OUTPUT
GND
GND
GND
*
GND
GND
*
FB
*
*
ON/OFF
*No Internal Connection
LM1575J
16 - LEAD DIP
CONNECTION DIAGRAM
TOP VIEW
P000371A
MIL/AEROSPACE OPERATIONS
2900 SEMICONDUCTOR DRIVE
SANTA CLARA, CA 95050
NC
NC
1
16
INPUT
NC
2
3
4
5
6
7
8
15
14
13
12
11
10
9
OUTPUT
NC
N/C
N/C
GND
NC
N/C
NC
NC
FEEDBACK
GND
ON/OFF
LM1575WG
16 - LEAD CERAMIC SOIC
CONNECTION DIAGRAM
TOP VIEW
P000464A
MIL/AEROSPACE OPERATIONS
2900 SEMICONDUCTOR DRIVE
SANTA CLARA, CA 95050
MICROCIRCUIT DATA SHEET
MNLM1575-12-X REV 0D1
Revision History
Rev ECN # Rel Date Originator Changes
0C0
M0001549 05/22/00
Barbara Lopez
Changed: MNLM1575-X-12 Rev 0B0 to MNLM1575-12-X Rev.
0C0. Added power dissipation note for Aluminum Nitride
package. Changed nomenclature.
0D1
M0003688 05/22/00
Rose Malone
Update MDS: MNLM1575-12-X, Rev. 0C0 to MNLM1575-12-X,
Rev. 0D1. Added reference to WG package to Main Table,
Market Dwg., B/I Ckt., Pin Out to Graphics Section and
to Absolute Maximum Ratings Section. Moved Controlling
Documents (SMD numbers) to Features Section. Corrected
typo in Recommended Operating Conditions Section.
8
相关型号：
LM1575-5.0AK
Switching Regulator, Voltage-mode, 1.3A, 52kHz Switching Freq-Max, BIPolar, MBFM2, TO-3, 4 PIN
MICROCHIP
LM1575-5.0MD8
IC 3.2 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or Controller
NSC
LM1575-5.0MW8
IC 3.2 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator or Controller
NSC
LM1575-ADJMD8
IC 3.2 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or Controller
NSC
LM1575AK
Switching Regulator, Voltage-mode, 1.3A, 52kHz Switching Freq-Max, BIPolar, MBFM2, TO-3, 4 PIN
MICROCHIP
©2020 ICPDF网 联系我们和版权申明