LM3478MAX
IC 1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8, SOP-8, Switching Regulator or ControllerLM3478MAX
IC 1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8, SOP-8, Switching Regulator or Controller
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Manufacturer Part # : LM3478MAX
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Package/Case: SOP-8
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Brand: Texas Instruments
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Product Categories : DC DC Switching Controllers
Quality Assurance
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Shipping & Payment
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Service & Packaging
Service & Packaging
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LM3478MAX DataSheet
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Current price plan is under preparation. Please contact our customer service team for the latest pricing information. Thank you for your understanding and support!
Details
for the LM3478The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators.It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC,etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reducethe overall solution size. The switching frequency of the LM3478 can be adjusted to any valuebetween 100 kHz and 1 MHz by using a single external resistor. Current mode control providessuperior bandwidth and transient response, besides cycle-by-cycle current limiting. Output currentcan be programmed with a single external resistor.The LM3478 has built-in features such as thermal shutdown, short-circuit protection, overvoltage protection, etc. Power saving shutdown mode reduces the total supply current to 5 µA andallows power supply sequencing. Internal soft-start limits the inrush current at start-up.
Key Features
- 8-leadVSSOP-8 and SOIC-8 packages
- Internal Push-Pull Driver With 1-A Peak CurrentCapability
- Current Limit and Thermal Shutdown
- FrequencyCompensation Optimized With a Capacitor and a Resistor
- Internal SoftStart
- Current Mode Operation
- Undervoltage Lockout WithHysteresis
- Create a Custom Design Using the LM3478 with theWEBENCHPower Designer
Specifications
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
Pbfree Code | No | Rohs Code | No |
Part Life Cycle Code | Obsolete | Part Package Code | SOIC |
Pin Count ! | 8 | Reach Compliance Code | compliant |
ECCN Code | EAR99 | HTS Code ! | 8542.39.00.01 |
Analog IC - Other Type | SWITCHING REGULATOR | Control Mode | CURRENT-MODE |
Control Technique | PULSE WIDTH MODULATION | Input Voltage-Max | 40 V |
Input Voltage-Min | 2.97 V | Input Voltage-Nom | 12 V |
JESD-30 Code | R-PDSO-G8 | JESD-609 Code | e0 |
Length | 4.9 mm | Number of Functions | 1 |
Number of Terminals | 8 | Operating Temperature-Max | 125 °C |
Operating Temperature-Min | -40 °C | Output Current-Max | 1 A |
Package Body Material | PLASTIC/EPOXY | Package Code | SOP |
Package Shape | RECTANGULAR | Package Style | SMALL OUTLINE |
Surface Mount ! | YES | Switcher Configuration | BOOST |
Switching Frequency-Max | 1000 kHz | Temperature Grade ! | AUTOMOTIVE |
Terminal Finish | TIN LEAD | Terminal Form ! | GULL WING |
Terminal Pitch ! | 1.27 mm | Terminal Position | DUAL |
Width | 3.9 mm |
Datasheet PDF
Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.
FAQs
What is LM3478MAX?
The LM3478MAX is a high-efficiency, 2.5A synchronous buck regulator designed by Texas Instruments. It is suitable for various power management applications, such as industrial power supplies, automotive systems, and LED lighting.
How Does LM3478MAX Work?
The LM3478MAX operates as a synchronous buck regulator, converting higher input voltage to a lower output voltage with high efficiency. It utilizes a pulse-width modulation (PWM) control scheme to regulate the output voltage. The regulator also features a built-in low-side N-channel power MOSFET and a high-side P-channel controller to achieve high efficiency.
How Many Pins does LM3478MAX have and What are the Functions of the Pinout Configuration?
The LM3478MAX is housed in a 10-pin MAX package. The pinout configuration includes:
- VIN: Input voltage pin.
- SW: Switch node for the internal MOSFET.
- GND: Ground pin.
- FB: Feedback pin for regulating the output voltage.
- SS/TR: Soft-start/tracking pin for controlling start-up behavior.
- EN: Enable pin for turning the regulator on/off.
- PWM: Pulse-width modulation pin for frequency synchronization.
- PGND1, PGND2: Power ground pins.
- VOUT: Regulated output voltage pin.
What are the Pros and Cons of LM3478MAX?
Pros:
- High Efficiency: Provides high efficiency in voltage conversion, reducing power dissipation.
- Integrated MOSFETs: The built-in low-side N-channel power MOSFET simplifies the design and layout.
- Wide Input Voltage Range: Suitable for a variety of input voltage levels.
- Synchronization Feature: Allows frequency synchronization for noise-sensitive applications.
- Compact Package: The 10-pin MAX package is space-efficient and thermally enhanced.
Cons:
- Complexity: Synchronous buck regulators may require careful consideration of layout and component selection for optimal performance.
- External Components: May require external components such as inductors and capacitors for specific applications.
- Thermal Considerations: High-efficiency converters may require thermal management in certain operating conditions.
Are There Any Equivalents/Alternatives to LM3478MAX for Recommendation?
- The LM2678 from Texas Instruments is a comparable synchronous buck regulator with similar features.
- Alternatives to the LM3478MAX include the LT8610 from Analog Devices and the TPS53515 from Texas Instruments.
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