LM342

3-Terminal Positive Regulators; Output current in excess of 0.25A\nInternal thermal overload protection\nNo external components required\nOutput transistor safe area protection\nInternal short circuit current limit\nAvailable in plastic TO-202 package\nSpecial circuitry allows start-up even if output is pulled to negative voltage (gsupplies);

General Description\nThe LM342-XX series of three-terminal regulators is available with several fixed output voltages, making them useful in a wide range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single point regulation. The voltages available allow these regulators to be used in logic systems, instrumentation, HiFi, and other solid state electronic equipment. Although designed primarily as fixed voltage regulators these devices can be used with external components to obtain adjustable voltages and currents.

LM342

3-Terminal Positive Regulators

LM3421

具有串联 DIM FET 驱动器的 N 沟道恒流 LED 驱动器控制器; • VIN 范围从 4.5V 至 75V\n• 高侧可调节电流感应\n• 2Ω、1A 峰值 MOSFET 栅极驱动器\n• 输入欠压和输出过压保护\n• PWM 和模拟调光\n• 逐周期电流限制\n• 可编程开关频率\n• 零电流关断和热关断\n• LED 输出状态标志（仅 LM3423 和 LM3423-Q0）\n• 故障状态标志和计时器（仅 LM3423 和 LM3423-Q0）;

LM3421 和 LM3423 系列器件是适用于 LED 驱动器的多功能高压 N 沟道 MOSFET 控制器。可以轻松为降压、升压、降压/升压和 SEPIC 拓扑配置这些器件。这一灵活性以及 75V 的输入电压额定值使得这些控制器非常适合在多种应用中 点亮 LED。\n\n可调节高侧电流感应电压允许以尽可能高的效率对 LED 电流进行严格稳压。LM3421 和 LM3423 器件采用预测性关闭时间 (PRO) 控制，此控制集成了峰值电流模式控制和预测性关闭计时器。这种控制方法简化了环路补偿设计，并提供了固有的输入电压前馈补偿。\n\nLM3421 和 LM3423 器件包含一个高电压启动稳压器，此稳压器能够在 4.5V 至 75V 的宽输入范围内工作。PWM 控制器专为高达 2MHz 的可调节开关频率而设计，因此可实现紧凑的解决方案。

LM3421-Q1

具有串联 DIM FET 驱动器的汽车类 N 沟道恒流 LED 控制器; • AEC Qualified for Automotive Applications \n• Device Temperature Grade 1: −40°C ≤ TA ≤ 125°C (LM3421-Q1 and LM3423-Q1)\n• Device Temperature Grade 0: −40°C ≤ TA ≤ 150°C (LM3421-Q0 and LM3423-Q0)\n \n• VIN Range From 4.5 V to 75 V\n• High-Side Adjustable Current Sense\n• 2-Ω, 1-A Peak MOSFET Gate Driver\n• Input Undervoltage and Output Overvoltage Protection\n• PWM and Analog Dimming\n• Cycle-by-Cycle Current Limit\n• Programmable Switching Frequency\n• Zero Current Shutdown and Thermal Shutdown\n• LED Output Status Flag (LM3423-Q1 and LM3423-Q0 Only)\n• Fault Status Flag and Timer(LM3423-Q1 and LM3423-Q0 Only);

The LM3421-Q1 and LM3423-Q1 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the these controllers ideal for illuminating LEDs in a large family of applications.\n\nAdjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421-Q1 and LM3423-Q1 devices use predictive off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.\n\nThe LM3421-Q1 and LM3423-Q1 devices include a high-voltage start-up regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions.

LM3420

Lithium-Ion Battery Charge Controller

LM3420

Lithium-Ion Battery Charge Controller

LM3420

8.4-V Li-Ion Battery Charge Controller

LM3420

丝印：3420；Package：SOT-23；N-Channel Enhancement Mode Power MOSFET

LM3420-12.6

Lithium-Ion Battery Charge Controller

LM3420-16.8

Lithium-Ion Battery Charge Controller