Data Sheet
LMR14010A 具有高效 Eco-mode 的 4V 至 40V、1A 降压转换器
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1 特性
- 输入电压范围：4V 至 40V，具有高达 45V 的瞬态保护
- 0.7MHz 开关频率
- 凭借 Eco-mode，可在轻负载下实现超高效率
- 低压降运行
- 输出电流高达 1A
- 精密使能输入
- 过流保护
- 内部补偿
- 内部软启动
- 小型总体设计尺寸（TSOT-6L 封装）
- 使用 LMR14010A 并借助 WEBENCH® Power Designer 创建定制设计方案
2 应用
- 智能仪表
- 电器
- 升降机和自动扶梯
- 摄像头
3 说明
LMR14010A 是一款 PWM 直流/直流降压稳压器。该器件具有 4V 至 40V 的宽输入范围，适用于各种工业和汽车应用。1µA 的超低关断电流可延长电池寿命。工作频率固定在 0.7MHz，从而允许使用小型外部元件，同时能够更大程度地降低输出纹波电压。在内部实现了软启动和补偿电路，从而限制了外部组件的数量。
LMR14010A 经优化可提供高达 1A 的负载电流。该器件具有 0.765V 的标称反馈电压。
该器件内置多种保护特性，例如逐脉冲电流限制、热感应和应对功耗过大的热关断。LMR14010A 采用薄型 TSOT-6L 封装 (2.9mm × 1.6mm × 0.85mm)。
(1) 有关更多信息，请参阅节 10。
(2) 封装尺寸（长 × 宽）为标称值，并包括引脚（如适用）。
简化原理图
效率与电流间的关系（ƒSW= 0.7MHz，VIN = 12V，VOUT = 3.3V）4 Pin Configuration and Functions
Figure 4-1 DDC Package, 6-Pin SOT-23-THIN (Top
View)Table 4-1 Pin Functions
| PIN | TYPE | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| CB | 1 | I | SW FET gate bias voltage. Connect Cboot capacitor between CB and SW. |
| FB | 3 | I | Feedback Pin. Set feedback voltage divider ratio with VOUT = VFB (1+(R1/R2)). |
| GND | 2 | G | Ground connection. |
| SHDN | 4 | I | Enable and disable input pin(high voltage tolerant). Internal pull-up current source. Pull below 1.25 V to disable. Float to enable. Adjust the input undervoltage lockout with two resistors. |
| SW | 6 | O | Switch node. Connect to inductor, diode and Cboot capacitor. |
| VIN | 5 | I | Power input voltage pin. Input for internal supply and drain node input for internal high-side MOSFET. |
5 Specifications
5.1 Absolute Maximum Ratings
Over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Input Voltages | VIN to GND | –0.3 | 45 | V |
| SHDN to GND | –0.3 | 45 | V | |
| FB to GND | –0.3 | 7 | V | |
| CB to SW | –0.3 | 7 | V | |
| Output Voltages | SW to GND | –1 | 45 | V |
| SW to GND less than 30-ns transients | –2 | 45 | V | |
| Operating junction temperature, TJ | –40 | 150 | °C | |
| Storage temperature range, Tstg | –55 | 165 | °C | |
(1) Stresses at or beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
5.2 ESD Ratings
| VALUE | UNIT | |||
|---|---|---|---|---|
| V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±1000 | V |
| Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±500 | |||
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. Manufacturing with less than 500-V HBM is possible with the necessary precautions.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Manufacturing with less than 250-V CDM is possible with the necessary precautions.
5.3 Recommended Operating Conditions
Over operating free-air temperature range (unless otherwise noted)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Buck regulator | Vin | 4 | 40 | V |
| CB | 46 | |||
| CB to SW | 6 | |||
| SW | –0.7 | 40 | ||
| FB | 0 | 5 | ||
| Control | SHDN | 0 | 40 | |
| Temperature | Operating junction temperature, TJ | –40 | 125 | °C |
