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Details, datasheet, quote on part number:LM2575T-012
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| Part: | LM2575T-012 |
| Category: | Power Management => DC-DC Converters => DC-DC Switching => Converters |
| Description: | 1A, Adjustable Output Voltage, Step-down Switching Regulator , Package: D2PAK, Pins=5 |
| Company: | ON Semiconductor |
| Datasheet: | Download LM2575T-012 datasheet File size : 250 kB |
| Request For quote: | Find where to buy LM2575T-012
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Datasheet text preview:
LM2575 1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
The LM2575 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regulator (buck converter). All circuits of this series are capable of driving a 1.0 A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version. These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2575 are offered by several different inductor manufacturers. Since the LM2575 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated by the LM2575 regulator is so low, that no heatsink is required or its size could be reduced dramatically. The LM2575 features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency (±2% over 0°C to 125°C). External shutdown is included, featuring 80 µA typical standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
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TO-220 TV SUFFIX CASE 314B
Heatsink surface connected to Pin 3
TO-220 T SUFFIX CASE 314D 1 5 Pin 1. 2. 3. 4. 5. Vin Output Ground Feedback ON/OFF
· 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions · Adjustable Version Output Voltage Range of 1.23 V to 37 V ±4% · · · · · · · · · · · · · · ·
Maximum Over Line and Load Conditions Guaranteed 1.0 A Output Current Wide Input Voltage Range: 4.75 V to 40 V Requires Only 4 External Components 52 kHz Fixed Frequency Internal Oscillator TTL Shutdown Capability, Low Power Standby Mode High Efficiency Uses Readily Available Standard Inductors Thermal Shutdown and Current Limit Protection Moisture Sensitivity Level (MSL) Equals 1 Simple and High-Efficiency Step-Down (Buck) Regulators Efficient Pre-Regulator for Linear Regulators On-Card Switching Regulators Positive to Negative Converters (Buck-Boost) Negative Step-Up Converters Power Supply for Battery Chargers
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D2PAK D2T SUFFIX CASE 936A
Heatsink surface (shown as terminal 6 in case outline drawing) is connected to Pin 3
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 24 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking section on page 24 of this data sheet.
Applications
© Semiconductor Components Industries, LLC, 2005
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August, 2003 - Rev. 5
Publication Order Number: LM2575/D
LM2575
Typical Application (Fixed Output Voltage Versions)
Feedback 7.0 V - 40 V Unregulated DC Input +Vin Cin 100 µF 1 3 Gnd 5 LM2575 4 Output 2 ON/OFF L1 330 µH D1 1N5819 Cout 330 µF 5.0 V Regulated Output 1.0 A Load
Representative Block Diagram and Typical Application
Unregulated DC Input Cin 4 Feedback R2 Fixed Gain Error Amplifier Comparator Current Limit +Vin 1
3.1 V Internal Regulator
ON/OFF
ON/OFF 5
Output Voltage Versions 3.3 V 5.0 V 12 V 15 V For adjustable version R1 = open, R2 = 0
R2 () 1.7 k 3.1 k 8.84 k 11.3 k
R1 1.0 k
Driver Freq Shift 18 kHz 52 kHz Oscillator Latch Output 1.0 Amp Switch Reset Thermal Shutdown 2 Gnd 3 D1 L1
Regulated Output Vout Cout Load
1.235 V Band-Gap Reference
This device contains 162 active transistors.
Figure 1. Block Diagram and Typical Application
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)
Rating Maximum Supply Voltage ON/OFF Pin Input Voltage Output Voltage to Ground (Steady-State) Power Dissipation Case 314B and 314D (TO-220, 5-Lead) Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 936A (D2PAK) Thermal Resistance, Junction-to-Ambient (Figure 34) Thermal Resistance, Junction-to-Case Storage Temperature Range Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 k) Lead Temperature (Soldering, 10 s) Maximum Junction Temperature Symbol Vin - - PD R J A R J C PD R J A R J C Tstg - - TJ Value 45 -0.3 V V +Vin -1.0 Internally Limited 65 5.0 Internally Limited 70 5.0 -65 to +150 3.0 260 150 Unit V V V W °C/W °C/W W °C/W °C/W °C kV °C °C
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LM2575
OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee
specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.) Rating Operating Junction Temperature Range Supply Voltage Symbol TJ Vin Value -40 to +125 40 Unit °C V
SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 14)
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 200 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.)
Characteristics LM2575-3.3 ([Note 1] Test Circuit Figure 14) Output Voltage (Vin = 12 V, ILoad = 0.2 A, TJ = 25°C) Output Voltage (4.75 V Vin 40 V, 0.2 A ILoad 1.0 A) TJ = 25°C TJ = -40 to +125°C Efficiency (Vin = 12 V, ILoad = 1.0 A) LM2575-5 ([Note 1] Test Circuit Figure 14) Output Voltage (Vin = 12 V, ILoad = 0.2 A, TJ = 25°C) Output Voltage (8.0 V Vin 40 V, 0.2 A ILoad 1.0 A) TJ = 25°C TJ = -40 to +125°C Efficiency (Vin = 12 V, ILoad = 1.0 A) LM2575-12 ([Note 1] Test Circuit Figure 14) Output Voltage (Vin = 25 V, ILoad = 0.2 A, TJ = 25°C) Output Voltage (15 V Vin 40 V, 0.2 A ILoad 1.0 A) TJ = 25°C TJ = -40 to +125°C Efficiency (Vin = 15V, ILoad = 1.0 A) LM2575-15 ([Note 1] Test Circuit Figure 14) Output Voltage (Vin = 30 V, ILoad = 0.2 A, TJ = 25°C) Output Voltage (18 V Vin 40 V, 0.2 A ILoad 1.0 A) TJ = 25°C TJ = -40 to +125°C Efficiency (Vin = 18 V, ILoad = 1.0 A) LM2575 ADJUSTABLE VERSION ([Note 1] Test Circuit Figure 14) Feedback Voltage (Vin = 12 V, ILoad = 0.2 A, Vout = 5.0 V, TJ = 25°C) Feedback Voltage (8.0 V Vin 40 V, 0.2 A ILoad 1.0 A, Vout = 5.0 V) TJ = 25°C TJ = -40 to +125°C Efficiency (Vin = 12 V, ILoad = 1.0 A, Vout = 5.0 V) VFB VFB 1.193 1.18 - 1.23 - 77 1.267 1.28 - % 1.217 1.23 1.243 V V Vout Vout 14.4 14.25 - 15 - 88 15.6 15.75 - % 14.7 15 15.3 V V Vout Vout 11.52 11.4 - 12 - 88 12.48 12.6 - % 11.76 12 12.24 V V Vout Vout 4.8 4.75 - 5.0 - 77 5.2 5.25 - % 4.9 5.0 5.1 V V Vout Vout 3.168 3.135 - 3.3 - 75 3.432 3.465 - % 3.234 3.3 3.366 V V Symbol Min Typ Max Unit
1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2575 is used as shown in the Figure 14 test circuit, system performance will be as shown in system parameters section. 2. Tested junction temperature range for the LM2575: Tlow = -40°C Thigh = +125°C
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