LM21305 - 具有可调频率的 3-18V、5A、电流模式同步降压稳压器

LM21305是TI德州仪器公司的一款转换器（集成开关）产品，LM21305是具有可调频率的 3-18V、5A、电流模式同步降压稳压器，本站介绍了LM21305的封装应用图解、特点和优点、功能等，并给出了与LM21305相关的TI元器件型号供参考。

LM21305 - 具有可调频率的 3-18V、5A、电流模式同步降压稳压器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM21305 is a full-featured 5A synchronous buck POL regulator optimized for solution size, flexibilty, and high conversion efficiency. High power density LM21305 designs are achieved via monolithic integration of the high-side and low-side power MOSFETs, high switching frequency, current-mode control, and optimized thermal design. The efficiency of the LM21305 is elevated at light loads with diode emulation mode operation and at heavy loads by optimal design of the MOSFET gate drivers to minimize switch dead-times and body-diode conduction losses.

The LM21305 accepts a wide input voltage range of 3V to 18V, facilitating interface to all intermediate bus voltages, including 3.3V, 5V and 12V rails. An output voltage as low as 0.598V is supported with excellent setpoint accuracy and low ripple and RMS noise.

The LM21305 offers flexible system configuration with programmable switching frequency from 300 kHz to 1.5 MHz using one resistor or via external clock synchronization. On-chip bias supply sub-regulators alleviate the need for external bias power and simplify PCB layout. The device also offers internal soft-start to limit inrush current, pre-biased and monotonic startup capability, cycle-by-cycle current limiting, and thermal shutdown. Peak current-mode control with a high-gain error amplifier maintains stability throughout the entire input voltage and load current ranges and enables excellent line and load transient response.

Offered in a thermally enhanced WQFN-28 package, the LM21305 features internal output over-voltage and over-current protection circuits for increased system reliability. A precision enable pin and integrated input UVLO allow the turn-on of the device to be tightly controlled and sequenced. An integrated open-drain power good indicator provides power rail sequencing capability and fault indication.

产品特性

High Efficiency Switcher Core With Integrated Low RDSon Power MOSFETs
Resistor Programmable Switching Frequency With Frequency Synchronization
Internal Soft-Start With Monotonic and Pre-Biased Startup
Low Shutdown Quiescent Current
Precision Enable With Hysteresis
PGOOD Indicator Function
Input Under-Voltage Lock-Out (UVLO)
Output Over-Voltage Protection (OVP)
High-Bandwidth Load Transient Response With Peak Current-Mode Control
Cycle-by-Cycle Current Limiting
Thermal Shutdown

Key Specifications

3V to 18V Single-Rail Input Voltage
0.598V Feedback Voltage Reference
300 kHz to 1.5 MHz Switching Frequency
WQFN-28 Package (5 x 5 x 0.8 mm, 0.5 mm Pitch)

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