LTC7806JUFDM#WPBF - 40V, 3MHz 2-Phase Synchronous Boost Controller | ADI
料号： LTC7806JUFDM#WPBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.18 | $6.18 |
| 10 | $5.61 | $56.10 |
| 100 | $4.99 | $499.00 |
| 500 | $4.42 | $2,210.00 |
| 1,000 | $3.92 | $3,920.00 |
LTC7806JUFDM#WPBF 概述
What is a boost controller? A boost (step-up) controller is a type of DC-DC switching controller that uses an external inductor and power switches to produce an output voltage higher than the input. The LTC7806 is a controller-only IC (no internal MOSFETs), so it drives external N-channel MOSFETs, allowing designers to scale output current by selecting MOSFETs of any desired Rds(on). It belongs to the hierarchy: boost controller -> DC-DC switching controller -> switching regulator -> power management IC -> semiconductor.
Key features include 2-phase synchronous operation up to 3MHz switching frequency, 4.5V to 40V input range, output up to 36V, low quiescent current, robust overcurrent protection for safe startup, and AEC-Q100 screening for automotive designs. Synchronous rectification increases efficiency and reduces power losses compared to asynchronous boost designs. High-frequency 2-phase operation reduces input and output capacitor requirements and allows smaller inductors than the single-phase equivalent.
The 2-phase architecture interleaves clock phases to cancel input ripple current, reducing RMS stress on the input capacitor and EMI filter. The exposed pad (EP) of the 4mm x 5mm QFN-28 package provides a low thermal resistance path (theta_JC of about 3 C/W), enabling high-power automotive boost applications up to tens of amps.
Typical applications include automotive pre-boost supplies for audio amplifiers, LED drivers and headlight electronics, industrial 24V-to-36V bus converters, battery-powered systems requiring step-up conversion, point-of-load (POL) converters in distributed power architectures, and emergency/backup power where wide input transients are common. The J-grade +150C operating range supports under-hood automotive placements.
When designing with this part, follow the datasheet guidance on output current sense resistor selection, soft-start capacitor sizing, and minimum on/off-time constraints. The exposed pad must be soldered to a sufficient copper pour (typically >= 1 sq inch on top + thermal via array to inner/outer planes) to keep junction temperature within the +150C maximum under worst-case load.
直接替换替代料： LTC7806JUFDM#WPBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LTC7806IUFDM#WPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC7806JUFDM#WTRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC7806IUFDM#WTRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC7806RUFDM#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3576EUFE-1#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC7806JUFDM#WPBF 最大额定值与电气特性
| 拓扑 | Boost (Step-Up) Controller |
| 输出数量 | 1 |
| 输入电压范围 | 4.5 V to 40 V |
| 输出电压 | Up to 36 V |
| Maximum Switching Frequency | 3 MHz |
| Number of Phases | 2 (synchronous, interleaved) |
| 同步整流 | Yes (drives external N-MOSFET) |
| 工作温度范围 | -40 C to +150 C (junction, J grade) |
| Package Type | 28-Lead (4 mm x 5 mm) Plastic QFN with Exposed Pad |
| 安装类型 | Surface Mount |
| AEC-Q100 Qualification | Qualified |
| RoHS 状态 | Compliant (Pb-free PBF suffix) |
| Lead-Free | Yes (PBF suffix) |
| Factory Pack Quantity | Tube (WPBF suffix per product family convention) |
LTC7806JUFDM#WPBF 引脚配置
| 引脚 1 | VIN — Main input supply; decouple to PGND with ceramic capacitor |
| 引脚 2 | VOUT — Boost output sense (controller monitors VOUT for regulation) |
| 引脚 3 | BST1 — Phase-1 boost capacitor node for top gate driver supply |
| 引脚 4 | TG1 — Phase-1 top gate drive (drives synchronous N-MOSFET) |
| 引脚 5 | SW1 — Phase-1 switching node (between external L and synchronous FET) |
| 引脚 6 | BG1 — Phase-1 bottom gate drive (drives synchronous N-MOSFET) |
| 引脚 7 | PGND1 — Phase-1 power ground return |
| 引脚 8 | SENSE1+ — Phase-1 current sense positive input (across sense resistor) |
| 引脚 9 | SENSE1- — Phase-1 current sense negative input |
| 引脚 10 | FREQ — Frequency set resistor to ground (programs switching frequency) |
| 引脚 11 | RT — Timing resistor (sets oscillator frequency) |
| 引脚 12 | SS — Soft-start programming capacitor |
| 引脚 13 | VREF — Internal reference bypass capacitor |
| 引脚 14 | ITH — Compensation node for the error amplifier |
| 引脚 15 | VFB — Voltage feedback input (external resistor divider sets VOUT) |
| 引脚 16 | RUN — Run/enable input (UVLO threshold) |
| 引脚 17 | PGOOD — Power good open-drain output |
| 引脚 18 | INTVCC — Internal 5V LDO output for gate drive supply |
| 引脚 19 | BST2 — Phase-2 boost capacitor node for top gate driver supply |
| 引脚 20 | TG2 — Phase-2 top gate drive (drives synchronous N-MOSFET) |
| 引脚 21 | SW2 — Phase-2 switching node (between external L and synchronous FET) |
| 引脚 22 | BG2 — Phase-2 bottom gate drive (drives synchronous N-MOSFET) |
| 引脚 23 | PGND2 — Phase-2 power ground return |
| 引脚 24 | SENSE2+ — Phase-2 current sense positive input |
| 引脚 25 | SENSE2- — Phase-2 current sense negative input |
| 引脚 26 | CLKOUT — Phase-clock output for cascaded multi-phase applications |
| 引脚 27 | MODE — Mode selection (pulse-skipping / forced-continuous / Burst Mode) |
| 引脚 28 | SYNC — External clock synchronization input |
典型应用
LTC7806JUFDM#WPBF 适用于 6 应用s: Automotive Pre-Boost Supply for Audio Amplifiers, Automotive LED Headlight Driver Front-End, Industrial 24V-to-36V Bus Converter, Battery-Backed Emergency Power Pre-Regulator, Point-of-Load Front-End in Distributed Power, ADAS Sensor Power Conditioning.
Automotive Pre-Boost Supply for Audio Amplifiers
The LTC7806JUFDM#WPBF is well suited to step up a 12V automotive battery rail to a 24V or 36V intermediate bus that feeds Class-D audio amplifiers. The controller's 4.5V to 40V input range tolerates load-dump transients up to 40V, and the 2-phase 3 MHz architecture minimizes input ripple current that would otherwise inject audible noise into the audio chain. J-grade +150C junction rating supports under-hood or amplifier heat-sink adjacent placements common in high-power infotainment systems.
推荐
Automotive LED Headlight Driver Front-End
In adaptive LED headlight modules, the LTC7806JUFDM#WPBF boosts the 12V battery rail to a stable 30V to 36V bus that powers downstream LED driver ICs and switching converters. The AEC-Q100 automotive screening and J-grade +150C temperature rating match the harsh thermal environment inside headlamp assemblies. The exposed-pad QFN-28 package provides low theta_JC for reliable operation at high boost duty cycles when input voltage dips during cranking.
推荐
Industrial 24V-to-36V Bus Converter
Industrial 24V factory bus systems often need a 36V rail to feed downstream buck regulators, motor pre-drivers, or sensor excitation supplies. The LTC7806JUFDM#WPBF handles 24V nominal inputs with margin up to 40V and produces up to 36V output with high efficiency thanks to synchronous rectification. The 3 MHz switching frequency enables use of small ceramic output capacitors and low-profile inductors, simplifying mechanical integration into DIN-rail or panel-mount enclosures.
推荐
Battery-Backed Emergency Power Pre-Regulator
Backup power systems that hold up critical loads during mains failure use a boost stage to step a low-voltage battery (12V or 18V) up to a 24V or 36V hold-up rail. The LTC7806JUFDM#WPBF's wide 4.5V to 40V input range lets a single design cover battery float, discharge, and recharge transients without input-side switching. The 2-phase topology keeps input ripple low - critical when the upstream battery is shared with RF or sensor front-ends sensitive to conducted noise.
推荐
Point-of-Load Front-End in Distributed Power
In distributed power architectures, an intermediate 24V or 36V bus feeds many isolated or non-isolated point-of-load converters. The LTC7806JUFDM#WPBF can serve as the front-end non-isolated boost that conditions the 12V intermediate rail up to 36V before downstream buck regulators distribute to processors, FPGAs, or analog ICs. The exposed-pad QFN-28 supports high continuous output power with minimal thermal derating in compact embedded designs.
推荐
ADAS Sensor Power Conditioning
Advanced Driver Assistance Systems (ADAS) including radar, lidar, and camera modules need clean, regulated rails above the 12V battery voltage to drive sensor front-ends, analog front-end ICs, and serializer/deserializer (SerDes) supplies. The LTC7806JUFDM#WPBF's AEC-Q100 screening, J-grade +150C rating, and low-EMI 2-phase 3 MHz operation make it a strong fit for pre-boost rails feeding these noise-sensitive ADAS modules. Synchronous rectification also improves light-load efficiency during parking-mode surveillance.
推荐
推荐产品汇总
工程参考数据： LTC7806JUFDM#WPBF ——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 | LTC7806IUFDM#WPBF | LTC7806JUFDM#WTRPBF | LTC7806IUFDM#WTRPBF | LTC7806RUFDM#PBF | LT3576EUFE-1#TRPBF |
|---|---|---|---|---|---|---|
| Package | QFN-28 (4mm x 5mm) with EP | QFN-28 (4mm x 5mm) with EP - same | QFN-28 (4mm x 5mm) with EP - same | QFN-28 (4mm x 5mm) with EP - same | QFN-28 (4mm x 5mm) with EP - same | QFN-28 (4mm x 5mm) - same package family |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | Lower VIN range (older family) |
| Maximum Switching Frequency | 3 MHz | 3 MHz | 3 MHz | 3 MHz | 3 MHz | Lower max frequency |
| RoHS / Lead-Free | Yes (PBF suffix) | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Widest J-grade +150C junction temperature for under-hood automotive （对比 LTC7806IUFDM#WPBF)
- Tube packing option for prototype-friendly low-volume orders （对比 LTC7806JUFDM#WTRPBF)
- 3 MHz 2-phase synchronous boost controller for small magnetics （对比 LT3576EUFE-1#TRPBF)
设计说明
The QFN-28 (4mm x 5mm) package exposes its die-attach pad (EP) on the underside; this pad must be soldered to a continuous ground copper pour and stitched with a thermal via array (typically 9-12 vias, 0.3mm drill, 0.6mm pitch) to inner and opposite-side ground planes. Without this, the junction-to-ambient thermal resistance (theta_JA) rises sharply and the +150C J-grade maximum will be exceeded at full load. Estimated: with a 1 sq inch top copper pour and 9-via array, theta_JA is approximately 35 C/W; at 5W dissipation this yields ~175C junction - still tight, so additional copper or airflow is recommended for continuous high-power operation.
Route the two phase switching nodes (SW1, SW2) with short, wide traces (>= 0.5 mm width per amp) and surround them with a guard ring of ground copper tied to PGND1/PGND2. Keep the sense resistor traces (SENSE1+/-, SENSE2+/-) as a Kelvin connection directly at the sense resistor pads - any extra trace resistance adds to the measured current and degrades current-limit accuracy. Place the INTVCC bypass capacitor (1 uF X7R) within 2 mm of the INTVCC pin and the VREF bypass capacitor (0.1 uF) within 2 mm of the VREF pin to keep the internal reference quiet.
Do not skip the BST1/BST2 bootstrap capacitors (typically 0.1 uF X7R) - these provide the floating supply for the top gate driver and without them the high-side MOSFET will not switch, causing boost output to sag to VIN. Avoid minimum on-time violations at high VIN / low VOUT combinations; consult the datasheet 'Minimum On-Time' specification and choose operating frequency or inductance to stay within limits. Finally, ensure the MODE pin is configured correctly for the application's light-load behavior (Burst Mode for lowest Iq, pulse-skipping for moderate efficiency, forced-continuous for best transient response).
合规信息
RoHS and REACH compliance per ADI product page; AEC-Q100 automotive qualified per datasheet ordering information; Pb-free PBF suffix on MPN; halogen-free status not stated in provided data - left unknown.
