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LTC3307A

采用 2 mm x 2 mm LQFN 封装的 5 V、3 A 同步降压型 Silent Switcher

英文数据手册

Rev. A

推荐新设计使用

顶部

概览

优势和特点
产品详情

优势和特点

高效率：8mΩ NMOS、31mΩ PMOS
可编程频率至3MHz
- 小型电感和电容
峰值电流模式控制
- 22ns最短导通时间
- 宽带宽、快速瞬态响应
Silent Switcher^™架构
- 超低EMI辐射
低纹波突发工作模式(Burst Mode^®)，I_Q为40µA
过载时安全地承受电感饱和

V_IN范围：2.25V至5.5V
V_OUT范围：0.5V至V_IN
V_OUT精度：超出温度范围±1%
精密400mV使能阈值
关断电流：1µA
电源正常、内部补偿和软启动
散热增强型2mm × 2mm LQFN封装
通过AEC-Q100汽车应用认证

产品详情

LTC3307A 是一款非常小巧、高效率、低噪声、单片同步 3 A 降压型 DC/DC 转换器，采用 2.25 V 至 5.5 V 输入电源工作。该稳压器运用恒定频率、峰值电流模式控制，开关频率高达 3MHz，最短接通时间低至 22 ns，可利用小型外部组件实现快速瞬态响应。Silent Switcher 架构最大限度降低了 EMI 发射。

LTC3307A 可工作在强制连续或脉冲跳跃模式以实现低噪声、或低纹波突发模式 (Burst Mode) 以在轻负载时实现高效率，非常适合电池供电型系统。该 IC 可调节低至 500 mV 的输出电压。其他特点包括输出过压/短路保护、热关断、时钟同步和高达 100% 占空比操作以实现低压差。此器件采用外形扁平的 12 引脚 2 mm × 2 mm × 0.74 mm LQFN 封装，该封装具有裸露焊盘以实现低热阻。

应用

光学网络、服务器、电信
汽车、工业、通信
分布式 DC 电源系统 (POL)
FPGA、ASIC、µP 内核电源

产品分类

电源管理

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产品生命周期推荐新设计使用

本产品已上市。数据手册包含所有最终性能规格和工作条件。ADI公司推荐新设计使用这些产品。

评估套件 (1)

DC2990A

LTC3307A | 5V Input to 1.2V Output at 3A Synchronous Step‑Down Silent Switcher Demo Circuit

DC2990A

查看此评估套件详细信息

Demonstration circuit 2990A features the LTC3307A 5V, 3A synchronous step-down Silent Switcher^® operating as a 2MHz, 3.3V to 1.2V 3A buck regulator. The LTC3307A supports adjustable output voltages from 0.5V to V_IN with operating frequencies from 1MHz up to 3MHz. The LTC3307A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. A minimum on-time of 22ns enables high V_IN to low V_OUT conversion ratios at high frequencies.

The DC2990A operating mode may be selected as Burst, Skip or forced continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3307A to sync to a clock frequency from 1MHz to 3MHz. The LTC3307A operates in forced continuous mode when syncing to an external clock. The DC2990A is set to a fixed 2MHz frequency by connecting RT to V_IN through a 0Ω resistor, R9. The frequency can be easily changed by removing R9 and setting an appropriate resistor in the R4 location to obtain the desired frequency. Refer to the LTC3307A data sheet for the proper RT value for a desired switching frequency.

The DC2990A also has an EMI filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the V_IN EMI terminal. The EMI performance of the board is shown in the EMI Test Results section. The red lines in the EMI performance graphs illustrate the CISPR25 Class 5 peak limits for the conducted and radiated emission tests.

The LTC3307A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual. The LTC3307A is assembled in a 2mm × 2mm LQFN package with exposed pads for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section Low EMI PCB Layout.

The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.

文档

数据手册 (1)

PDF

2.26 M

LTC3307A: 5V, 3A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN Data Sheet (Rev. A)

Reliability Data (1)

PDF

499.22 K

R523 Reliability Data

评估板套件使用手册 (1)

PDF

1.75 M

DC2990A - Demo Manual

工具及仿真模型

LTspice

LTspice®是一款强大高效的免费仿真软件、原理图采集和波形观测器，为改善模拟电路的仿真提供增强功能和模型。

LTspice downloads and documentation

Models for the following parts are available in LTspice:

LTC3307A

LTC3307B

LTpowerCAD

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

LTpowerCAD download and documentation