|Category||Power Management => Power Distribution/Switches => MOSFET Drivers|
|Description||High Efficiency Low-Side N-Channel Controller For Switching Regulator
The 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 reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100kHz and 1MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.
|Company||National Semiconductor Corporation|
|Datasheet||Download LM3478 datasheet
|Cross ref.||Similar parts: MAX887HESA, MAX887HESA+, MAX887HESA+T, MAX887HESA-T, MAX17067EUA+, MAX17067EUA+T, MAX1776EUA, MAX1776EUA+, MAX1776EUA+T, MAX1776EUA-T|
|LM3478/LM3478Q High Efficiency Low-Side N-Channel Controller for Switching Regulator
The 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 reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100kHz and 1MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor. The LM3478 has built in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.Features
Automotive Grade Flow Mini-SO8 (MSOP-8) package Internal push-pull driver with 1A peak current capability Current limit and thermal shutdown Frequency compensation optimized with a capacitor and a resistor Internal softstart Current Mode Operation Undervoltage Lockout with hysteresisApplications
Distributed Power Systems Battery Chargers Offline Power Supplies Telecom Power Supplies Automotive Power Systems
Wide supply voltage range to 1MHz Adjustable clock frequency ±2.5% (over temperature) internal reference 10µA shutdown current (over temperature)Typical High Efficiency Step-Up (Boost) Converter
Order Number LM3478QMM LM3478QMMX Package Type MSOP-8 Package Marking S14B SSFB Supplied As: 1000 units on Tape and Reel 3500 units on Tape and Reel 1000 units on Tape and Reel 3500 units on Tape and Reel AEC-Q100 (Grade 1) qualified. Automotive Grade Production Flow* Feature
* Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products are identified with the letter Q. For more information go to http://www.national.com/automotive.
Pin Name ISEN COMP FB AGND PGND DR FA/SD Pin Number Description Current sense input pin. Voltage generated across an external sense resistor is fed into this pin. Compensation pin. A resistor, capacitor combination connected to this pin provides compensation for the control loop. Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.26V at this pin. Analog ground pin. Power ground pin. Drive pin. The gate of the external MOSFET should be connected to this pin. Frequency adjust and Shutdown pin. A resistor connected to this pin sets the oscillator frequency. A high level on this pin for longer than 30 µs will turn the device off. The device will then draw less than 10µA from the supply. Power Supply Input pin.
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage FB Pin Voltage FA/SD Pin Voltage Peak Driver Output Current (<10µs) Power Dissipation Storage Temperature Range Junction Temperature ESD Susceptibilty Human Body Model (Note -0.4V < VFB -0.4V < VFA/SD 7V 1.0A Internally Limited +150°C 2kVLead Temperature MM Package Vapor Phase (60 sec.) Infared (15 sec.) DR Pin Voltage ISEN Pin Voltage
Supply Voltage Junction Temperature Range Switching Frequency
Specifications in Standard type face are for = 25°C, and in bold type face apply over the full Operating Temperature Range. Unless otherwise specified, VIN = 12V, RFA = 40k Symbol VFB Parameter Feedback Voltage Conditions VCOMP 1.4V, 2.97 VIN 40V Feedback Voltage Line Regulation Output Voltage Load Regulation Input Undervoltage Lock-out Input Undervoltage Lock-out Hysteresis Nominal Switching Frequency RFA 40K 2.97 VIN 40V IEAO Source/Sink VUV(HYS) RDS1 (ON) RDS2 (ON) VDR (max) Dmax Tmin (on) Driver Switch On Resistance (top) Driver Switch On Resistance (bottom) Maximum Drive Voltage Swing(Note 6) Maximum Duty Cycle(Note 7) Minimum On Time IDR = 0.2A, VIN= 5V IDR = 0.2A VIN < 7.2V VIN 16 4.5 VIN ISUPPLY IQ VSENSE Supply Current (nonswitching) Quiescent Current in Shutdown Mode Current Sense Threshold Voltage Short-Circuit Current Limit Sense Voltage (Note 9) VFA/SD = 5V (Note 10), VIN = 5V VIN = 5V VIN = 5V nsec nsec(min) nsec(max) mA (max) µA (max) mV (min) mV (max) mV (min) mV (max) Typical 1.2416/1.228 1.2843/1.292 Limit Units V V(min) V(max) %/V (max) V V(max) mV (min) mV (max) kHz kHz(min) kHz(max) V
|Related products with the same datasheet|
|Some Part number from the same manufacture National Semiconductor Corporation|
|LM3478QMM High Efficiency Low-Side N-Channel Controller For Switching RegulatorThe LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring|
|LM3488 High Efficiency Low-Side N-Channel Controller For Switching RegulatorsThe LM3488 is a versatile Low-Side N-FET high performance controller for switching regulators. It is suitable for use in topologies|
|LMH0384 3 Gbps HD/SD SDI Extended Reach And Configurable Adaptive Cable EqualizerThe LMH0384 3 Gbps HD/SD SDI Extended Reach and Configurable Adaptive Cable Equalizer is designed to equalize data transmitted|
|LM2841 300 MA/600 MA Up To 42V Input Step-Down DC/DC Regulator In Thin SOT-23The LM2841 and LM2842 are PWM DC/DC buck (step-down) regulators. With a wide input range from 4.5V-42V, they are suitable for a wide|
|LM3429 N-Channel Controller For Constant Current LED DriversThe LM3429 is a versatile high voltage LED driver controller. With the capability to be configured in a Buck, Boost, Buck-Boost (Flyback), or SEPIC|
|DS22EV5110 DVI, HDMI Extended Reach Equalizer With Retimer And Output De-EmphasisThe DS22EV5110 is a 6.75 Gbps (3 x 2.25 Gbps) extended reach equalizer optimized for DVIand HDMI cable extension applications with|
|DS34RT5110 DVI, HDMI Retimer With Input Equalization And Output De-EmphasisThe DS34RT5110 is a 10.2 Gbps (3 x 3.4 Gbps) high performance re-clocking device that supports 3 Transition Minimized Differential Signaling|
|LM98725 Three Channel, 16-Bit, 81 MSPS Analog Front End With LVDS/CMOS Output And Integrated CCD/CIS Sensor Timing GeneratorThe LM98725 is a fully integrated, high performance 16-Bit, 81 MSPS signal processing|
|ADC11DV200 Dual 11-bit, 200 MSPS Low-Power A/D Converter With Parallel LVDS/CMOS OutputsThe ADC11DV200 is a monolithic analog-to-digital converter capable of converting two analog input signals into 11-bit digital|
|LM3550 5A Flash LED Driver With Automatic Vf And ESR Detection For Mobile Camera SystemsLM3550 is a low noise, switched capacitor DC/DC converter designed to operate as a current-limited and adjustable (up to 5.3V)|
|DS64BR401 Quad Bi-Directional Transceiver With Equalization And De-EmphasisThe DS64BR401 is a quad lane bi-directional signal conditioning transceiver suitable for 6.0/3.0/1.5 Gbps SATA/SAS and other high-speed|
|DS50PCI401 2.5 Gbps / 5.0 Gbps 4 Lane PCI Express Transceiver With Equalization And De-EmphasisThe DS50PCI401 is a low power, 4 lane bidirectional buffer/equalizer designed specifically for PCI Express Gen1 and Gen2|
|LMV1090 Dual Input, Far Field Noise Suppression Microphone AmplifierThe LMV1090 is a fully analog dual differential input, differential output, microphone array amplifier designed to reduce background acoustic|
|LMH2190 Quad Channel 26 MHz Clock Tree Driver With IC InterfaceThe LMH2190 is a quad channel configurable clock distribution device which supplies the system clock to peripherals in mobile handsets or other|
|LM3554 1.2A Dual Flash LED Driver System With I2C Compatible InterfaceThe LM3554 is a 2 MHz fixed frequency, current mode synchronous boost converter. The device is designed to operate as a dual 600mA (1.2A|
|LP5553 PowerWise AVS Energy Management Unit With SPMIThe LP5553 is a System Power Management Interface (SPMI) compliant Energy Management Unit for reducing power consumption of low power hand held applications|
|LM57 Resistor-Programmable Temperature Switch And Analog Temperature Sensor From The PowerWise® FamilyThe LM57 is a precision, dual-output, temperature switch with integrated analog temperature sensor. The trip|
|LM25011 42V, 2A Constant On-Time Switching Regulator With Adjustable Current LimitThe LM25011 Constant On-time Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient,|
|LMK04031B Precision Clock Conditioners Low-Noise Clock Jitter Cleaner With Cascaded PLLs From The PowerWise® FamilyThe LMK04000 family of precision clock conditioners provides low-noise jitter cleaning, clock|
|LM3000 Dual Synchronous Emulated Current-Mode Controller From The PowerWise® FamilyThe LM3000 is a dual output synchronous buck controller which is designed to convert input voltages ranging from 3.3V to 18.5V|
|LM48311 Ultra-Low EMI, Filterless, 2.6W, Mono, Class D Audio Power Amplifier With E2SThe LM48311 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48311 features Nationals|
LM1084I-ADJ : Positive Voltage->Adjustable LM1084 - 5A Low Dropout Positive Regulators, Package: TO263, Pin Nb=3
LM35DH : LM35 - Precision Centigrade Temperature Sensor, Package: TO-46, Pin Nb=3
LM4041CIM7X-ADJ : LM4041 - Precision Micropower Shunt Voltage Reference, Package: SOT-23, Pin Nb=3
LM136AH-2.5RLQV : Reference Diode
VJ0805A1R8DXQAP2L : Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM26LVCISD-110 : 1.6 V, Llp-6 Factory Preset Temperature Switch and Temperature Sensor
COP8SGC728M9 : 8-bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and Usart
COP8SGC928M3 : 8-bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and Usart
54123FMQB : DUAL Retriggerable One-shop WITH Clear AND Complementary Outputs
2KBP02M/3N255 : 2.0 Ampere Bridge Rectifiers. IO if(surge) PD RJA Tstg TJ Average Rectified Current Peak Forward Surge Current Total Device Dissipation Derate above 25°C Thermal Resistance, Junction to Ambient,** per leg Storage Temperature Range Operating Junction Temperature *These ratings are limiting values above which the serviceability of any semiconductor device may be impaired. **Device.
AD402M168RBA-5 : Low Voltage Operation is More Suitable to be Used on Battery Backup, Portable Electronic.
LM140L : Fixed. LM140L - Series 3-Terminal Positive Regulators, Package: TO-39, Pin Nb=3.
LM385BD-1-2 : ti LM385B-1.2, Micropower Voltage Reference. Operating Current Range mA 1% and 2% Initial Voltage Tolerance Reference Impedance LM385. 1 Max 25°C All Devices. 1.5 Max Over Full Temperature Range Very Low Power Consumption Applications Portable Meter References Portable Test Instruments Battery-Operated Systems Current-Loop Instrumentation Panel Meters Interchangeable With Industry.
MAX1779 : Low-power Triple-output TFT LCD DC-DC Converter. The MAX1779 triple-output DC-DC converter provides highly efficient regulated voltages required by small active matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs). One high-power DC-DC converter and two low-power charge pumps convert the to +5.5V input supply voltage into three independent output voltages. The primary high-power DC-DC.
MIC2590B : MIC2590B Dual-slot Pci Hot Plug Controller. The is a power controller supporting power distribution requirements for Peripheral Component Interconnect (PCI) hot plug compliant systems incorporating the Intelligent Platform Management Interface (IPMI). The MIC2590B provides complete power control support for two PCI slots including the 3.3VAUX defined by the PCI 2.2 . Support for +3.3V, +12V and 12V.
PT8001 : Non-Isolated DC-DC Converters. 60A Output Current Multi-Phase Topology +5V Input 5-bit Programmable: to 1.850V High Efficiency Differential Remote Sense Short Circuit Protection Output Tracking Feature Over-Temp Shutdown Power Good & OV Flag Low-Profile Package Solderable Copper Case "Current Booster" Compatible The PT8000 series 60 A highperformance, Integrated Switching Regulator.
ZTR250 : Fixed. Fixed 2.5 3-terminal Voltage References. The ZTR250 and ZTR500 are precision three terminal references. These devices are ideal for battery powered applications where power saving is important. They offer low power alternatives to other two terminal shunt references. The ZTR devices do not require an external resistor and, in contrast to two terminal references, waste none of the battery power.
AAT3681 : USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger The AAT3681 BatteryManager is a member of AnalogicTech's Total Power Management IC (TPMIC) product family. This product is a highly integrated single cell lithium-ion/polymer battery charger IC, designed to operate from a DC power source or USB port to an input voltage of 6.5V. It requires.
MAX8922L : 30V Li+ Linear Battery Charger With GSM Test Mode In 3mm X 2mm TDFN The MAX8922L linear battery charger safely charges a single-cell lithium-ion (Li+) battery. Charging rate is optimized to accommodate the thermal characteristics of a given application. There is no need to reduce the maximum charge current at the worst-case charger power dissipation.
LMZ10504EXT : 4A, SIMPLE SWITCHER® Power Module With 5.5V Maximum Input Voltage For Military And Rugged Applications The LMZ10504EXT SIMPLE SWITCHER® power module is a complete, easy-to-use DC-DC solution capable of driving up to a 4A load with exceptional power conversion efficiency, output voltage accuracy, line and load regulation. The LMZ10504EXT is available.
MAX890 : 1.2A, Current-Limited, High-Side P-Channel Switch With Thermal Shutdown The MAX890L smart, low-voltage, P-channel, MOSFET power switch is intended for high-side load-switching applications. This switch operates with inputs from +2.7V to +5.5V, making it ideal for both +3V and +5V systems. Internal current-limiting circuitry protects the input supply.
MAX8969 : Step-Up Converter For Handheld Applications The MAX8969 is a simple 1A step-up converter in a small package that can be used in any single-cell Li-ion application. This IC provides protection such as input undervoltage lockout, short circuit, and overtemperature shutdown. The IC transitions to skip mode seamlessly under light-load conditions to improve.
LT1236LS8 : Precision, Low Noise, Low Profile Hermetic Voltage Reference The LT®1236LS8 is a precision reference that combines low drift and noise with excellent long-term stability and high output accuracy. The reference output will both source and sink up to 10mA and remains very constant with input voltage variations. The hermetic package provides outstanding.
NCP1851 : 1.6A Fully Integrated Li-Ion Switching Battery Charger With Power Path Management The NCP1851 is a fully programmable single cell Lithium-ion switching battery charger optimized for charging from a USB compliant input supply and AC adaptor power source. The device integrates a synchronous PWM controller, power MOSFETs, and the entire charge cycle monitoring.