The LM3409, LM3409-Q1, LM3409HV, and LM3409HV-Q1 are P-channel MOSFET (PFET) controllersfor step-down (buck) current regulators. They offer wide input voltage range, high-sidedifferential current sense with low adjustable threshold voltage and fast output enable/disablefunction and a thermally enhanced 10-pin, HVSSOP package. These features combine to make the LM3409 family of devices ideal for use as constant current sources for driving LEDs where forward currentsup to 5 A are easily achievable.

The LM3409 devices use constant off-time (COFT) control to regulate an accurate constantcurrent without the need for external control loop compensation. Analog and PWM dimming are easy toimplement and result in a highly linear dimming range with excellent achievable contrast ratios. Programmable UVLO, low-power shutdown, and thermal shutdown complete the feature set.

For all available packages, see the orderable addendum at the end of the data sheet.

• LM3409-Q1 and LM3409HV-Q1 are Automotive Grade Products: AEC-Q100 Grade 1 Qualified
• 2-?, 1-A Peak MOSFET Gate Drive
• VIN Range: 6 V to 42 V (LM3409, LM3409-Q1)
• VIN Range: 6 V to 75 V (LM3409HV, LM3409HV-Q1)
• Differential, High-Side Current Sense
• Cycle-by-Cycle Current Limit
• No Control Loop Compensation Required
• 10,000:1 PWM Dimming Range
• 250:1 Analog Dimming Range
• Supports All-Ceramic Output Capacitors and Capacitor-less Outputs
• Low-Power Shutdown and Thermal Shutdown
• Thermally Enhanced 10-Pin, HVSSOP Package

• Number of channels (#)
• 1
• Topology
• Buck Controller
• Rating
• Automotive
• Operating temperature range (C)
• -40 to 125
• Vin (Min) (V)
• 6
• Vin (Max) (V)
• 42
• Vout (Min) (V)
• 1.24
• Vout (Max) (V)
• 42
• Iout (Max) (A)
• 5
• Iq (Typ) (mA)
• 2
• Switching frequency (Max) (kHz)
• 2000
• Features
• Adjustable Switch Frequency, Enable/Shutdown, Precision Dimming Control, Thermal Shutdown

LM3409-Q1的完整型号有：LM3409QMY/NOPB、LM3409QMYX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3409QMY/NOPB，工作温度：-40 to 125，封装：HVSSOP (DGQ)-10，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3409QMY/NOPB的批量USD价格：.755（1000+）

LM3409QMYX/NOPB，工作温度：-40 to 125，封装：HVSSOP (DGQ)-10，包装数量MPQ：3500个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3409QMYX/NOPB的批量USD价格：.629（1000+）

LM3409EVAL — LM3409 演示板

This demonstration board showcases the LM3409 PFET controller for a buck current regulator. It is designed to drive 4 LEDs (VO = 15V) at a maximum average LED current (ILED = 1A) from a DC input voltage (VIN = 24V). The switching frequency (fSW = 525 kHz) is targeted for the nominal operating (...)

LM3409-Q1 PSpice Transient Model

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