LT1933IDCB - 600mA 500kHz Step-Down Regulator | Analog Devices
料号： LT1933IDCB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.28 | $3.28 |
| 10 | $3.28 | $32.80 |
| 100 | $3.28 | $328.00 |
| 500 | $3.28 | $1,640.00 |
| 1,000 | $3.28 | $3,280.00 |
LT1933IDCB 概述
A step-down DC/DC converter, also called a buck converter, reduces a higher input voltage to a regulated lower voltage using an internal switching element, inductor, capacitor, and control loop. The LT1933 belongs to the switching-regulator family within the broader DC/DC converter and power-management semiconductor hierarchy. Its current-mode PWM architecture provides a practical solution for generating local rails from automotive, industrial, or distributed power systems.
The LT1933 uses an internal 0.75 A power switch and is specified for a 600 mA output configuration. Its 500 kHz switching frequency supports a compact implementation with external passive components. The 6-lead DFN package reduces board area, while the exposed pad provides a thermal connection when copper area and heat dissipation are adequate. The adjustable output allows the design to select the required feedback divider rather than using a fixed-voltage version.
The verified distributor data identifies the part as a positive adjustable buck regulator with a 1.245 V reference and a 600 mA output rating. The manufacturer search result describes the LT1933 family as a current-mode PWM step-down converter with an internal 0.75 A switch and a wide 3.6 V to 36 V input range. Additional electrical values, including efficiency curves, switching specifications, current-limit behavior, thermal resistance, and inductor recommendations, should be confirmed in the manufacturer datasheet before production release.
Typical applications include point-of-load regulation, industrial control systems, automotive electronics, battery-powered equipment, and portable electronics. In these systems, the converter can create a lower, stable rail for sensors, communications circuitry, analog sections, or embedded controllers. Because a switching regulator introduces ripple and switching-node energy, layout and component selection are as important as the nominal voltage and current ratings.
Use the exposed pad as a thermal and electrical connection according to the package land pattern, and keep the switching node compact and away from sensitive signal paths. Verify the maximum input voltage, duty-cycle limits, output-voltage accuracy, current-limit behavior, and capacitor ratings in the official datasheet. This page combines distributor data, manufacturer information, and practical design guidance for engineers evaluating a compact 600 mA buck regulator.
直接替换替代料： LT1933IDCB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LT1933IDCB （相同外形与封装尺寸） ——差异在于 Package, Topology.
快速对比工具——选择替代料号进行并排对比：
LT1933IDCB#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT1933IDCB 最大额定值与电气特性
| Product Type | Step-Down Switching Regulator |
| 拓扑 | Current-Mode PWM Buck Converter |
| Rated Output Current | 600 mA |
| 输入电压范围 | 3.6 V to 36 V |
| 开关频率 | 500 kHz |
| Internal Power Switch | 0.75 A |
| 输出类型 | Positive Adjustable |
| 基准电压 | 1.245 V |
| 输出电压 | 1.245 V to 31.68 V |
| 封装 | 6-WFDFN Exposed Pad |
| Package Lead Count | 6 |
| 安装类型 | Surface Mount |
| Temperature Grade | Automotive |
| Switching Control | Current-Mode PWM |
LT1933IDCB 6 引脚配置指南
LT1933IDCB（6 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： LT1933IDCB.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LT1933IDCB 适用于 6 应用s: Industrial Point-of-Load Regulation, Automotive Electronic Control Units, Battery-Powered Portable Equipment, RF and Communications Module Rails, Sensor and Analog Front-End Power, LED and Display Backlight Control.
Industrial Point-of-Load Regulation
The LT1933IDCB is suitable for creating a local regulated rail from a higher industrial supply. Its 3.6 V to 36 V input range covers many nominal bus-derived systems, while the 500 kHz switching frequency allows a compact power stage. The 600 mA rating is useful for controller, sensor, communications, and logic loads. The exposed-pad DFN package helps transfer heat when the board provides adequate copper. The main design checks are available duty-cycle margin, inductor ripple, capacitor ESR, startup behavior, and thermal rise. Feedback routing should be kept short and away from the switching node to preserve regulation accuracy.
推荐
Automotive Electronic Control Units
The wide 3.6 V to 36 V input capability makes the LT1933IDCB a candidate for automotive electronics when the exact qualification and transient requirements are satisfied. The 500 kHz PWM stage can generate lower auxiliary rails for sensors, interfaces, and control logic. Its 600 mA output rating supports moderate-load subrails rather than high-current actuators. Automotive implementation requires careful review of load dump, reverse battery, temperature, EMI, and startup behavior beyond the basic operating range. The exposed pad should be tied to the recommended thermal land pattern, and the final design should use the manufacturer’s automotive qualification documentation for the exact suffix.
推荐
Battery-Powered Portable Equipment
A buck regulator can reduce battery-system voltage to a stable logic or analog rail with better efficiency than a linear regulator when the voltage step-down is large. The LT1933IDCB provides a 3.6 V minimum input, 36 V maximum input, and 600 mA rated output, making it applicable to battery-derived systems whose input remains within that range. Its small 6-WFDFN footprint supports space-constrained boards, while the 500 kHz frequency permits compact filtering. Designers must calculate battery droop, startup sequencing, light-load behavior, quiescent current, and thermal dissipation. The selected inductor must maintain current above the load requirement while limiting saturation and ripple.
推荐
RF and Communications Module Rails
The LT1933IDCB can provide a compact local supply for communications modules, RF front ends, or mixed-signal sections that require a regulated rail derived from a higher input. The 500 kHz switching frequency supports a small implementation, and the 600 mA rating can serve moderate-current digital and analog loads. Switching converters can add conducted and radiated noise, so the design should use short current loops, controlled switching-node copper, shielded or carefully placed inductors, and filtered feedback. The final ripple and sensitivity requirements must be checked against the communications equipment specification. A linear post-regulator may be preferable when the load is exceptionally noise-sensitive.
推荐
Sensor and Analog Front-End Power
The LT1933IDCB can supply a lower regulated rail for sensors, amplifiers, converters, and data-acquisition front ends. A buck topology reduces the required external headroom compared with a linear regulator when the input-to-output voltage difference is significant. The 500 kHz operating frequency permits reasonably small magnetic components, while the exposed-pad package supports compact placement. Designers should still account for ripple reaching sensitive analog nodes and may add filtering or a low-noise post-regulator where required. The feedback divider tolerance and reference accuracy determine output precision. Place the feedback network close to the device and avoid routing it beside the inductor or switching node.
推荐
LED and Display Backlight Control
The LT1933IDCB may be evaluated for auxiliary power in LED, display, or backlight systems where a regulated lower rail is needed for driver logic or control electronics. Its 600 mA current rating is appropriate for moderate-load control and analog sections, but it is not intended by itself to replace a high-current LED constant-current driver. The wide input range can support multiple nominal supply sources, and the 6-WFDFN package leaves room for compact power routing. The designer must verify LED driver topology, ripple tolerance, dimming compatibility, and the voltage headroom available at the lowest input. If the LED string requires direct current regulation, use a dedicated LED driver and consider this device for its control rail.
推荐
推荐产品汇总
工程参考数据： LT1933IDCB ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LT1933ES6 | LT1933IDCB#TRPBF |
|---|---|---|---|
| Package | 6-WFDFN Exposed Pad | SOT-23-6 — not same package | 6-WFDFN Exposed Pad — same package family |
| Brand | Analog Devices | Analog Devices | Analog Devices |
关键差异点
- Wide input range for compact buck conversion （对比 LT1933ES6)
- Exposed-pad package supports compact thermal integration （对比 LT1933ES6)
- Adjustable positive output referenced to 1.245 V （对比 LT1933IDCB#TRPBF)
设计说明
Use the manufacturer’s recommended land pattern for the 6-WFDFN exposed-pad package and connect the exposed pad to the specified thermal and ground copper. Keep the input capacitor, switching node, inductor, and output capacitor in a compact current-loop arrangement. Do not route feedback traces beneath or parallel to the switching node, because induced ripple can degrade output regulation.
Thermal performance depends on copper area, board construction, ambient temperature, switching loss, and the input-to-output voltage ratio. The exposed pad is not a substitute for a thermal-analysis result. Verify the package land pattern, maximum junction temperature, and application-specific dissipation in the datasheet and thermal simulation before production.
The 500 kHz switching regulator can radiate or conduct switching noise. Keep the switching node physically small, minimize high-dv/dt copper, place the inductor and input capacitor close to the device, and follow the manufacturer’s recommended output filtering. For sensitive analog or RF circuits, compare the measured output ripple with the maximum noise specification and consider a linear post-regulator.
Select the inductor and capacitors using the actual input voltage, output voltage, 600 mA load target, allowed ripple, switching frequency, and startup requirements. Check inductor saturation current, DC resistance, capacitor voltage rating, ripple-current rating, ESR, and effective capacitance. The verified data does not provide the recommended passive values, so do not infer them without the official datasheet.
合规信息
The supplied data identifies an automotive temperature grade but does not explicitly state AEC-Q100 qualification, RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for the exact LT1933IDCB orderable part. Confirm these declarations with Analog Devices and the exact suffix.
