National Manuals

The LP3945 and LP3946 are complete charge management systems that safely charge and maintain a Li-Ion battery or a four-cell Ni-MH (LP3945 only) battery pack. The LP3945 offers the flexibility of programming charge current, battery regulation voltage (4.1V/4.2V), battery type (Li-Ion/Ni-MH), and End Of Charge (EOC) termination through the use of I2C interface. On the LP3946, these parameters are programmed at the factory per customer specification. The pass transistor, charge current sensing resistor and charge current setting resistors are all integrated inside the LP3945 and LP3946. This eliminates the use of external components and significantly reduces design time and board space. The LP3945 and LP3946 operate in four modes: pre-qualification, constant current, constant voltage and maintenance modes. The LP3945 features Ni-MH charging mode as well. The charger has under-voltage and over-voltage protection as well as an internal 5.6 hr timer to prevent overcharging the battery. There are two open drain outputs for status indication. An internal amplifier readily converts the charge current into a voltage. Also, the charger can operate in an LDO mode providing up to 1 Amp to the load.

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The LM4919 is a single-channel 85mW BTL output, 14mW stereo headphone audio amplifier. This device operates on a single 1.5V supply and provides 85mW of power in single-channel BTL mode with an 8-ohm load and 1% THD+N. In single-ended stereo headphone mode, the amplifier delivers 14mW per channel with a 16-ohm load and 1% THD+N. The LM4919 is packaged in the MM package, which provides low profile and small size, minimizing PCB area and maximizing output power. It features circuitry that reduces output transients (“clicks” and “pops”) during device turn-on and turn-off, an externally controlled, low-power consumption, active-low shutdown mode, and thermal shutdown. Boomer audio power amplifiers are designed specifically to use few external components and provide high quality output power in a surface mount package.

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LP38500/2-ADJ, LP38500A/2A-ADJ 1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs

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The DS90C363/DS90CF364 is a +3.3V programmable LVDS transmitter and receiver suitable for 18-bit flat panel display (FPD) link with a frequency support of 65 MHz. The transmitter converts 21 bits of CMOS/TTL data into three LVDS data streams and transmits a phase-locked transmit clock over a fourth LVDS link. The receiver converts the LVDS data streams back into 21 bits of CMOS/TTL data. At a transmit clock frequency of 65 MHz, 18 bits of RGB data and 3 bits of LCD timing and control data (FPLINE, FPFRAME, DRDY) are transmitted at a rate of 455 Mbps per LVDS data channel. With a 65 MHz clock, the data throughput is 170 MB/s. The transmitter features programmable edge data strobes for easy interface with various graphics controllers. The transmitter can be programmed for rising edge strobe or falling edge strobe through a dedicated pin. A rising edge transmitter can interoperate with a falling edge receiver (DS90CF364) without any translation logic. This chipset is an ideal solution to address EMI and cable size issues associated with wide, high-speed TTL interfaces.

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The LM7321/LM7322 is a high-performance operational amplifier with a wide operating voltage range, high output current, and the ability to drive unlimited capacitive loads. It offers an 18 V/µs slew rate and a 20 MHz unity gain bandwidth while requiring only 1 mA of supply current per op amp.

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The LP3990 regulator is designed to meet the requirements of portable, battery-powered systems providing an accurate output voltage, low noise, and low quiescent current. The LP3990 will provide a 0.8V output from the low input voltage of 2V at up to 150mA load current. When switched into shut- down mode via a logic signal at the enable pin, the power consumption is reduced to virtually zero. The LP3990 is designed to be stable with space saving ceramic capacitors as small as 1.0µF. Performance is specified for a -40°C to 125°C junction temperature range. For output voltages other than 0.8V, 1.2, 1.35V, 1.5V, 1.8V, 2.5V, 2.8V, or 3.3V please contact your local NSC sales office.

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LM3421/LM3423 are versatile high voltage LED driver controllers, ideal for a wide range of applications.

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The MM5452 is a monolithic integrated circuit utilizing CMOS metal gate, low threshold enhancement mode devices. It can drive up to 32 segments of LCD and can be paralleled to increase this number. The chip is capable of driving a 41⁄2-digit 7-segment display with minimal interface between the display and the data source. The MM5452 stores display data in latches after it is clocked in, and holds the data until new display data is received. Features include serial data input, no load signal required, DATA ENABLE (MM5452), wide power supply operation, TTL compatibility, 32 or 33 outputs, alphanumeric and bar graph capability, cascaded operation capability.

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DS25BR204 is a 3.125 Gbps 1:4 LVDS repeater with transmit pre-emphasis and receive equalization.

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LMK01000/LMK01010/LMK01020 is a high performance clock buffer, divider and distributor that provides an easy way to divide and distribute high performance clock signals throughout the system. The device provides best-in-class noise performance and is designed to be pin-to-pin and footprint compatible with LMK03000/LMK02000 family of precision clock conditioners. The LMK01000/LMK01010/LMK01020 family features two programmable clock inputs (CLKin0 and CLKin1) that allow the user to dynamically switch between different clock domains. Each device features 8 clock outputs with independently programmable dividers and delay adjustments. The outputs of the device can be easily synchronized by an external pin (SYNC*).

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The LM3150 is a simple step-down power controller from National Semiconductor that can provide up to 12A of output current in a typical application. It features an adjustable output voltage down to 0.6V, an input voltage range of 6V-42V, and a switching frequency that can be adjusted up to 1MHz. The LM3150 uses a proprietary Emulated Ripple Mode (ERM) control that allows for the use of low ESR output capacitors, which reduces overall solution size and output voltage ripple.

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This datasheet provides detailed information on the LME49870, a high performance, high fidelity audio operational amplifier with low distortion, low noise, and high slew rate.

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The LMV851/LMV852/LMV854 are National’s low power, CMOS input, EMI hardened operational amplifiers. They offer low input bias current, a wide temperature range of -40 °C to +125 °C and exceptional performance, making them robust general purpose parts. Additionally, the LMV851/LMV852/LMV854 are EMI hardened to minimize any interference so they are ideal for EMI sensitive applications. The unity gain stable LMV851/LMV852/LMV854 feature 8 MHz of bandwidth while consuming only 0.4 mA of current per channel. These parts also maintain stability for capacitive loads as large as 200 pF. The LMV851/LMV852/ LMV854 provide superior performance and economy in terms of power and space usage. This family of parts has a maximum input offset voltage of 1 mV, a rail-to-rail output stage and an input common-mode voltage range that includes ground. Over an operating supply range from 2.7V to 5.5V the LMV851/LMV852/LMV854 provide a CMRR of 92 dB, and a PSRR of 93 dB. The LMV851/LMV852/LMV854 are offered in the space saving 5-Pin SC70 package, the 8-Pin MSOP and the 14-Pin TSSOP package.

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LM2794/LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control

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The LM3524D is a pulse width modulator with ±1% precision 5V reference. The output drive transistor current carrying capability has been increased to 200 mA while reducing VCEsat and increasing VCE breakdown to 60V. The error-amp common mode voltage range has been increased to 5.5V to eliminate the need for a resistive divider from the 5V reference. In the LM3524D, the circuit bias line has been isolated from the shutdown pin. This prevents the oscillator pulse amplitude and frequency from being disturbed by shutdown. Additionally, at high frequencies (~300 kHz), the max. duty cycle per output has been improved to 44% compared to 35% max. duty cycle in other 3524s. In addition, the LM3524D can now be synchronized externally, through pin 3. A latch has also been added to insure one pulse per period even in noisy environments. The LM3524D includes double pulse suppression logic that insures when a shutdown condition is removed the state of the T-flip-flop will change only after the first clock pulse has arrived. This feature prevents the same output from being pulsed twice in a row, thus reducing the possibility of core saturation.

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The LM4904 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply. The LM4904 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. It features a low-power consumption shutdown mode and an internal thermal shutdown protection mechanism.

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The LMH0356 is a 3Gbps HD/SD SDI Reclocker that supports a 4:1 input multiplexer and FR4 EQs. It complies with the SMPTE 424M, SMPTE 292M, and SMPTE 259M (C) standards and supports data rates of 270Mbps, 1.483Gbps, 1.485Gbps, 2.967Gbps, and 2.97Gbps. It also supports DVB-ASI operation at 270Mbps.

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LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diodes

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