LTC3636EUFD - Dual 6A, 20V Sync Step-Down DC/DC | Analog Devices
料号： LTC3636EUFD ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $10.5 | $10.50 |
| 10 | $9.45 | $94.50 |
| 100 | $8.45 | $845.00 |
| 500 | $7.55 | $3,775.00 |
| 1,000 | $6.75 | $6,750.00 |
LTC3636EUFD 概述
A synchronous buck regulator (also called a step-down converter) is a switching power topology that reduces a higher DC input voltage to a lower, regulated DC output voltage with very high efficiency by alternately storing energy in an inductor and releasing it into the load. The LTC3636EUFD belongs to the monolithic synchronous buck regulator family, sitting within the broader DC/DC converter class, the voltage regulator category, and ultimately the power management integrated circuit hierarchy used in nearly every battery-powered or point-of-load application.
Key features include two independent 6A output channels, an adjustable output range from 0.6V to 5V, 95% peak efficiency, programmable soft-start, and an operating temperature range of -40C to +125C. The exposed pad package delivers low thermal resistance for continuous high-current operation, while the wide 3.1V to 20V input range makes it well suited to lithium-ion battery stacks and 12V or 5V point-of-load rails.
The controlled on-time current-mode architecture provides fast transient response and allows the LTC3636EUFD to operate with very small ceramic output capacitors, simplifying board layout and reducing BOM cost. Its phase-lockable frequency can be synchronized to an external clock, enabling parallel-channel interleaving to minimize input ripple when both channels are combined.
Typical applications include point-of-load regulation for FPGAs, ASICs, DSPs, and microprocessors from 12V or 5V buses, industrial distributed power systems, battery-powered portable equipment, and multi-rail telecom/datacom boards where two independent high-current low-voltage rails are required from a common input source.
When designing with the LTC3636EUFD, select low-ESR ceramic input and output capacitors rated for the worst-case ripple current, and place the inductor close to the SW node to minimize switching losses and EMI. The exposed pad must be soldered to a sufficiently large copper pour for thermal dissipation at 6A continuous load.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet.
直接替换替代料： LTC3636EUFD ——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： LTC3636EUFD （相同外形与封装尺寸） ——差异在于 Input Voltage Range, MSL Level, Operating Temperature Range, Output Voltage Range, Package.
快速对比工具——选择替代料号进行并排对比：
LTC3636EUFD-1#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3636IUFD#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3636EUFD#WTRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3636EUFD#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3633AIUFD
✅ 直接替换✓ 有现货
$9.45 / 个
查看数据手册 →LTC3636EUFD 最大额定值与电气特性
| 拓扑 | Synchronous Step-Down (Buck) |
| 输出数量 | 2 |
| 输入电压范围 | 3.1 V to 20 V |
| 输出电压范围 | 0.6 V to 5 V |
| Maximum Output Current (per channel) | 6 A |
| Switching Frequency Range | 500 kHz to 4 MHz |
| Default Switching Frequency | 2 MHz (RT tied to INTV_CC) |
| Architecture | Controlled On-Time Current Mode |
| 工作温度范围 | -40 C to +125 C |
| 封装 | 28-Pin QFN-EP (4 mm x 5 mm) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (Unlimited) |
| RoHS 状态 | ROHS3 Compliant |
| REACH Status | REACH Unaffected |
| Peak Efficiency | Up to 95% |
| 静态电流 | 600 uA |
LTC3636EUFD 引脚配置
| 引脚 1 | SW1 — Switch node for channel 1 |
| 引脚 2 | SW1 — Switch node for channel 1 (continued) |
| 引脚 3 | PGND1 — Power ground for channel 1 |
| 引脚 4 | PGND1 — Power ground for channel 1 (continued) |
| 引脚 5 | BST1 — Bootstrap for channel 1 high-side driver |
| 引脚 6 | VIN1 — Input supply for channel 1 |
| 引脚 7 | VIN1 — Input supply for channel 1 (continued) |
| 引脚 8 | INTVCC — Internal 4.5V LDO bypass |
| 引脚 9 | VOUT1 — Output sense for channel 1 |
| 引脚 10 | FB1 — Feedback for channel 1 |
| 引脚 11 | RT — Timing resistor / frequency set |
| 引脚 12 | SHDN1 — Shutdown for channel 1 (active high) |
| 引脚 13 | PGOOD1 — Power good for channel 1 (open drain) |
| 引脚 14 | SHDN2 — Shutdown for channel 2 (active high) |
| 引脚 15 | FB2 — Feedback for channel 2 |
| 引脚 16 | VOUT2 — Output sense for channel 2 |
| 引脚 17 | VIN2 — Input supply for channel 2 |
| 引脚 18 | VIN2 — Input supply for channel 2 (continued) |
| 引脚 19 | BST2 — Bootstrap for channel 2 high-side driver |
| 引脚 20 | PGND2 — Power ground for channel 2 |
| 引脚 21 | PGND2 — Power ground for channel 2 (continued) |
| 引脚 22 | SW2 — Switch node for channel 2 |
| 引脚 23 | SW2 — Switch node for channel 2 (continued) |
| 引脚 24 | NC — Not connected (per datasheet) |
| 引脚 25 | NC — Not connected (per datasheet) |
| 引脚 26 | NC — Not connected (per datasheet) |
| 引脚 27 | NC — Not connected (per datasheet) |
| 引脚 28 | PGOOD2 — Power good for channel 2 (open drain) |
典型应用
LTC3636EUFD 适用于 6 应用s: FPGA and ASIC Point-of-Load Power, Industrial Distributed Power Systems, Telecom and Datacom Multi-Rail Boards, Battery-Powered Portable Devices, Automotive Infotainment and ADAS, Test and Measurement Equipment.
FPGA and ASIC Point-of-Load Power
The LTC3636EUFD is purpose-built for FPGA and ASIC point-of-load conversion. Its two independent 6A channels can power a core rail (e.g., 1.0V-1.2V at 6A) and an auxiliary rail (e.g., 1.8V or 2.5V at 6A) from a common 12V or 5V input. With up to 4 MHz switching frequency, the LTC3636EUFD enables very small ceramic output capacitors and keeps the power-stage footprint minimal, which is critical in dense digital designs. Trade-off: 95% peak efficiency is slightly lower than discrete solutions, but the integration saves PCB area.
推荐
Industrial Distributed Power Systems
The 3.1V to 20V wide input range and -40C to +125C operating range of the LTC3636EUFD make it ideal for 12V and 24V industrial distributed power architectures. Each 6A channel can independently serve a separate functional block (controller board, sensor module, communication interface), allowing one regulator to replace two discrete single-channel converters. The exposed pad package delivers low thermal resistance for continuous high-current operation in enclosed industrial enclosures.
推荐
Telecom and Datacom Multi-Rail Boards
In telecom base-station line cards and datacom switching fabric boards, the LTC3636EUFD provides two synchronized point-of-load rails from a single 12V backplane input. The phase-lockable switching frequency allows multiple LTC3636EUFDs to be synchronized and interleaved, reducing input ripple and EMI when scaling to 12A, 18A, or 24A loads. The 0.6V output supports modern 1.2V Core voltage rails at half the load on each phase.
推荐
Battery-Powered Portable Devices
With a 3.1V minimum input and up to 95% efficiency, the LTC3636EUFD is well suited to lithium-ion battery stack applications where a 2S-4S pack (6.8V-16.8V) must be regulated down to a microcontroller and a peripheral voltage. The 600 uA quiescent current limits drain during standby, and the dual outputs can power a core rail and a radio rail simultaneously. Compared with a discrete solution, the LTC3636EUFD reduces BOM count by approximately 50%.
推荐
Automotive Infotainment and ADAS
The AEC-Q100 qualified LTC3636EUFD#WTRPBF variant is rated for automotive applications, making the LTC3636EUFD platform suitable for infotainment processors, ADAS SoCs, and digital cockpit controllers. Two 6A channels easily handle the transient demands of an automotive SoC's core and DDR rails from a 12V automotive battery rail. The exposed-pad QFN-28 package survives under-hood thermal stress when properly heatsinked on the PCB.
推荐
Test and Measurement Equipment
Bench-top test equipment and portable instruments benefit from the LTC3636EUFD's dual 6A capability. The high 2 MHz default switching frequency (programmable to 4 MHz) places harmonics above sensitive analog measurement bands, while the synchronous architecture minimizes switching noise into adjacent analog signal chains. The 0.6V output range supports modern low-voltage DAC and ADC reference rails.
推荐
推荐产品汇总
工程参考数据： LTC3636EUFD ——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 | LTC3636EUFD-1#PBF | LTC3636IUFD#PBF | LTC3636EUFD#WTRPBF | LTC3636EUFD#TRPBF | LTC3633AIUFD |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | QFN-28 (4x5 mm) | QFN-28 (4x5 mm) - same | QFN-28 (4x5 mm) - same | QFN-28 (4x5 mm) - same | QFN-28 (4x5 mm) - same | QFN-28 (4x5 mm) - same |
| Number of Outputs | 2 | 2 | 2 | 2 | 2 | 1 |
| Output Current (per channel) | 6 A | 6 A | 6 A | 6 A | 6 A | 3 A (-50%) |
| Input Voltage Range | 3.1 V to 20 V | 3.1 V to 20 V | 3.1 V to 20 V | 3.1 V to 20 V | 3.1 V to 20 V | 3.1 V to 20 V |
| Output Voltage Range | 0.6 V to 5 V | 0.6 V to 5 V | 0.6 V to 5 V | 0.6 V to 5 V | 0.6 V to 5 V | 0.6 V to 5 V |
| Packaging Format | Tray (#PBF) | Tray | Tray | Tape & Reel | Tape & Reel | Tray |
关键差异点
- Dual 6A monolithic synchronous buck in a single QFN-28 4x5 mm package （对比 LTC3633AIUFD)
- Programmable up to 4 MHz switching for small ceramic output capacitors （对比 LTC3636EUFD#TRPBF)
- Automotive grade AEC-Q100 variant available （对比 LTC3636EUFD#WTRPBF)
设计说明
Estimated: at VIN=12V, VOUT=1.2V, and 6A continuous on both channels, total power dissipation is (12-1.2) V x 6 A x 2 = ~129 W. In practice the converter efficiency at this ratio is ~85-90% per the LTC3636 datasheet typical curves, so total dissipation is ~14-19 W. The QFN-28 4x5 mm exposed pad package requires a sufficiently large copper pour (typically at least 1 square inch of 2 oz copper per channel) on top and bottom layers, plus thermal vias under the EP, to keep the junction temperature within the 125 C operating limit. Without adequate copper, the part will trip thermal shutdown under full dual 6A load.
Place input capacitors (typically 22 uF X7R ceramic per channel plus a bulk) as close as possible to the VINx and PGNDx pins, with a wide PGNDx polygon on the top layer. Keep the SWx traces short and use a ground shield on inner layers directly below the SWx traces to reduce radiated EMI. The exposed thermal pad must be soldered to the PCB thermal land with thermal vias arrayed on 1 mm pitch to the internal ground plane.
Do not exceed 20 V continuous on VINx - although the absolute maximum is 22 V, sustained transients above 20 V may damage the internal MOSFETs. Per datasheet: avoid exceeding 25 V transients longer than 1 ms. When synchronizing multiple LTC3636EUFDs, set the master at the highest frequency and use the CLKOUT/PHASELOCK feature (RT pin tie to INTVCC) to ensure correct phase interleaving. Also, the BSTx high-side bootstrap capacitor must be a 0.1 uF X7R placed within 5 mm of the BSTx and SWx pins to prevent high-side gate drive starvation.
At 2 MHz default switching the LTC3636EUFD harmonics fall above sensitive 400 kHz analog measurement bands, simplifying EMI filter design. However, the SWx traces must be guarded with a continuous ground plane and bypassed with a small RC snubber (1-2 ohm in series with 1 nF X7R, per datasheet reference design) to suppress ringing from the LC tank formed by the SWx trace inductance and the BSTx diode capacitance.
合规信息
ROHS3 Compliant and MSL 1 (Unlimited) per Analog Devices product page. REACH Unaffected. AEC-Q100 not qualified - choose LTC3636EUFD#WTRPBF for automotive applications.
