ApplicationSimple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to negative converter (Buck-Boost)Pinout
Specifications
| Output Current |
1000 mA |
| Input Min Voltage |
4 Volt |
| Input Max Voltage |
40 Volt |
| Output Min |
1.23, 12, 15, 5 Volt |
| Output Max |
37, 12, 15, 5 Volt |
| Frequency Min |
52 kHz |
| Frequency Max |
52 kHz |
| Efficiency (peak) |
88 % |
| On/Off Pin |
Yes |
| Error Flag |
No |
| SoftStart |
No |
| Sync Pin |
No |
| Inverting |
Yes |
| RegType |
Switching Regulator |
| Temperature Min |
-55 deg C |
| Temperature Max |
150 deg C |
| Adjustable Output |
No |
| Adj Switch Frequency |
No |
| PWM Mode |
Voltage |
| Topology |
Buck |
| Special Features |
SIMPLE SWITCHER regulator |
| Step-Down |
Yes |
| Multiple Output Capability |
No |
| Output Voltage |
12, 15, 5 Volt |
| Output Range |
15V, 5V, 12V, 1.23V to 37V |
| Switching Frequency |
52 kHz |
| Regulator Family |
SIMPLE SWITCHER |
| View Using Catalog |
Maximum Supply Voltage
LM1575/LM2575 45V
LM2575HV 63V
Output Voltage to Ground
(Steady State)−1V
Power DissipationInternally Limited
Storage Temperature Range −65˚C to +150˚C
Maximum Junction Temperature 150˚CDescriptionThe LM1575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.
The LM1575 series 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 voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 A (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM1575J-ADJ-QML |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.For more information on Reliability Metrics, please click here.
Design Tools
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The LM1575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator. The LM2575 series 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 voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
LM1575 Data Sheet
