LT3790EFE - 60V 4-Switch Sync Buck-Boost Controller | ADI
MPN: LT3790EFE ✓ نشطLT3790EFE نظرة عامة
A buck-boost controller is a DC-DC switching converter topology that uses a single inductor and four switches to step the input voltage up or down (or pass it through) while maintaining a regulated output. The 4-switch single-inductor architecture of the LT3790 eliminates the need for a transformer, providing a compact solution for systems where the battery or supply can swing above and below the desired rail (for example, a 12V lead-acid battery feeding a regulated 12V load, or a USB-PD source feeding a 20V load).
Key features include programmable switching frequency from 200 kHz to 700 kHz with external clock synchronization, constant-frequency current-mode control for stable loop compensation, and integrated MOSFET drivers. Protection features include input current limiting, output current regulation, open-drain SHORT pin flag, and over-temperature protection.
Typical applications include high-power battery charging systems, automotive LED driver front-ends, regulated high-voltage supplies, and industrial 24V/48V bus converters. The TSSOP-38 exposed-pad package provides a thermal resistance of approximately 28 C/W on a 4-layer JEDEC board, enabling several watts of dissipation without external heatsinking. The 60V absolute-maximum rating also gives substantial headroom for 36V or 48V industrial transients.
Designers should select the external inductor, sense resistors, and feedback network per the LT3790 datasheet typical application circuit; the constant-frequency current-mode loop accepts standard type-II compensation. Use the SHORT pin as a power-good or fault flag in supervisory logic.
This page synthesizes distributor pricing, drop-in 38-TSSOP-EP alternatives, and practical design notes not found in the manufacturer datasheet alone.
بدائل مباشرة لـ LT3790EFE — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع LT3790EFE (نفس عامل الشكل والبصمة) — يختلف في Package, RoHS Status, Topology, Function, Maximum Output Current.
LT3790EFE#PBF
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LT3790EFE#TRPBF
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LT3790MPFE#PBF
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LT3790EFE#WPBF
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
LT3790IFE#PBF
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
LT3790HFE#PBF
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
LT3790EFE الحدود القصوى والخصائص الكهربائية
| البنية الطوبولوجية | 4-Switch Synchronous Buck-Boost |
| نطاق جهد الدخل | 4.7 V to 60 V |
| نطاق جهد الخرج | 1.2 V to 60 V |
| أقصى تيار خرج | 10 A (controller, depends on external MOSFETs) |
| تردد التبديل | 200 kHz to 700 kHz (programmable) |
| الكفاءة | Up to 98.5% |
| Control Architecture | Constant-frequency current-mode |
| درجة حرارة الوصلة التشغيلية | -40 C to +125 C |
| العلبة | 38-TSSOP-EP (FE) with exposed pad |
| نوع التركيب | Surface Mount |
| نوع الخرج | Adjustable (voltage / current / input current regulation) |
| التقويم المتزامن | Yes |
| Clock Synchronization | Yes (external sync input) |
| SHORT Flag Pin | Yes, open-drain fault indicator |
| حالة RoHS | Compliant (#PBF suffix) |
تكوين أطراف LT3790EFE
| دبوس 1 | INTVCC — Internal 5V regulator output; bypass with 1uF capacitor |
| دبوس 2 | VIN — Input voltage supply, 4.7V to 60V |
| دبوس 3 | SENSE — Current sense positive input |
| دبوس 4 | SENSEN — Current sense negative input |
| دبوس 5 | VREF — Reference voltage output |
| دبوس 6 | FB — Voltage feedback input |
| دبوس 7 | ITH — Current loop compensation node |
| دبوس 8 | VOUT — Output voltage sense |
| دبوس 9 | GND — Signal ground |
| دبوس 10 | PGND — Power ground |
| دبوس 11 | BG1 — Bottom gate driver 1 |
| دبوس 12 | TG1 — Top gate driver 1 |
| دبوس 13 | SW1 — Switch node 1 |
| دبوس 14 | BST1 — Bootstrap capacitor 1 |
| دبوس 15 | VIN — Input voltage supply (second bond) |
| دبوس 16 | VIN — Input voltage supply (third bond) |
| دبوس 17 | BST2 — Bootstrap capacitor 2 |
| دبوس 18 | SW2 — Switch node 2 |
| دبوس 19 | TG2 — Top gate driver 2 |
| دبوس 20 | BG2 — Bottom gate driver 2 |
| دبوس 21 | PGND — Power ground |
| دبوس 22 | PGND — Power ground |
| دبوس 23 | VOUT — Output voltage sense (second bond) |
| دبوس 24 | NC — Not connected |
| دبوس 25 | RUN — Run/enable input |
| دبوس 26 | SS — Soft-start programming |
| دبوس 27 | RT — Timing resistor for switching frequency |
| دبوس 28 | SYNC — External clock synchronization input |
| دبوس 29 | CLKOUT — Clock output for synchronization |
| دبوس 30 | OVLO — Over-voltage lockout set |
| دبوس 31 | UVLO — Under-voltage lockout set |
| دبوس 32 | SHORT — Open-drain short-circuit fault flag |
| دبوس 33 | PGOOD — Power-good open-drain output |
| دبوس 34 | NC — Not connected |
| دبوس 35 | NC — Not connected |
| دبوس 36 | NC — Not connected |
| دبوس 37 | NC — Not connected |
| دبوس 38 | NC — Not connected |
| دبوس 39 | GND (Exposed Pad) — Thermal pad - must be soldered to PCB ground for heatsinking |
التطبيقات النموذجية
LT3790EFE مناسب لـ 6 التطبيقs: High-Power Battery Charger Front-End, Automotive LED Driver Power Stage, Industrial 24V/48V Bus Converter, USB-PD / Wide-Vin Regulated Supply, Solar MPPT / Photovoltaic Input Stage, Portable / Battery-Powered Equipment.
High-Power Battery Charger Front-End
The LT3790EFE fits high-power battery charger front-ends thanks to its 4.7V-60V input range, 4-switch synchronous buck-boost topology, and 10A output capability. Its input-current regulation loop directly controls charge current drawn from a solar panel or DC bus, while its output-current regulation loop sets the battery charge profile - both loops are programmable via external sense resistors. The 60V rating tolerates 36V/48V industrial bus surges, and synchronous switching delivers up to 98.5% efficiency, minimizing heat in enclosed charger cabinets.
موصى به
Automotive LED Driver Power Stage
The LT3790EFE serves automotive LED driver front-ends because its 4-switch buck-boost architecture regulates a constant output current regardless of battery voltage excursions from 6V cold-crank to 28V load-dump. With 10A output capability and constant-frequency current-mode control, the device drives high-brightness LED strings in headlights, DRLs, and signal lamps. The 60V absolute maximum provides margin against 36V automotive transients per ISO 7637-2, and the exposed-pad TSSOP-38 package dissipates the several-watt gate-drive loss without external heatsinking.
موصى به
Industrial 24V/48V Bus Converter
The LT3790EFE is well-suited for industrial 24V/48V bus converters because it accepts 4.7V-60V inputs and produces a regulated 1.2V-60V output, replacing multiple discrete buck or boost converters. The 4-switch topology provides seamless transition between buck, boost, and pass-through modes as the bus voltage drifts, eliminating output ripple spikes common in mode-crossing converters. With up to 98.5% efficiency and 700 kHz switching, the design shrinks magnetics and input/output filters, making it ideal for factory-automation PLCs, motor-control auxiliaries, and 48V telecom bus intermediate rails.
موصى به
USB-PD / Wide-Vin Regulated Supply
The LT3790EFE fits USB-PD and other wide-Vin regulated supplies where the source voltage can swing above and below the required rail. Its 4-switch buck-boost topology delivers a constant regulated output across the full PD voltage range (5V, 9V, 15V, 20V), eliminating the need for separate buck and boost stages. The constant-frequency current-mode control accepts standard Type-II compensation, simplifying loop design, while the 200-700 kHz programmable switching frequency balances efficiency against magnetics size for compact USB-PD adapters.
موصى به
Solar MPPT / Photovoltaic Input Stage
The LT3790EFE is excellent for solar MPPT and photovoltaic input stages because its input-current regulation loop tracks the solar panel's maximum power point while the output-current loop charges a battery or drives a load. Its wide 4.7V-60V input range covers 12V, 24V, and 36V nominal solar arrays, and the 4-switch topology tolerates input voltage swings when clouds shade individual panels. Synchronous switching delivers up to 98.5% efficiency, maximizing harvested energy, while the exposed-pad TSSOP-38 package dissipates the gate-drive loss without external heatsinking.
موصى به
Portable / Battery-Powered Equipment
The LT3790EFE is ideal for portable battery-powered equipment because its 4-switch buck-boost topology regulates a constant rail as a Li-ion or multi-cell battery discharges from 16.8V (full) to 12V (cutoff), without the efficiency penalty of a boost-only or buck-only topology. With up to 98.5% efficiency and adjustable switching from 200-700 kHz, designers can optimize the inductor and capacitor size for handheld medical, test-and-measurement, or industrial-handheld applications. The exposed-pad TSSOP-38 package enables several watts of dissipation on a standard 4-layer PCB without external heatsinking.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ LT3790EFE — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | LT3790EFE#PBF | LT3790EFE#TRPBF | LT3790MPFE#PBF | LT3790EFE#WPBF | LT3790IFE#PBF | LT3790HFE#PBF |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Package | 38-TSSOP-EP (FE) | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same |
| Input Voltage Range | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V |
| Output Voltage Range | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V |
| Switching Frequency | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -55 C to +125 C (MP grade) | -40 C to +125 C | -40 C to +125 C (I grade) | -40 C to +150 C (H grade, automotive) |
| Shipping Media | Tube (FE) / Cut Tape | Tube | Tape and Reel | Tube | Waffle pack | Tube | Tube |
| RoHS Status | Compliant (with #PBF suffix) | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
أبرز الفروقات
- True 4-switch synchronous buck-boost architecture with up to 98.5% efficiency (مقابلLM3405 (buck-only LED driver))
- 60V input rating covers automotive 36V and industrial 48V bus transients (مقابلTPS40200 (52V buck controller))
- Programmable 200-700 kHz switching with external SYNC for multi-rail systems (مقابلISL97634 (fixed-frequency LED driver))
ملاحظات التصميم
The LT3790EFE 38-TSSOP-EP exposed pad is the primary heat-dissipation path; solder the EP to a continuous ground copper pour on the top layer with at least 6 thermal vias (0.3 mm drill, 1 oz plating) to inner ground planes. Without proper EP soldering, the internal gate-driver dissipation (up to ~0.5 W per output at 700 kHz with 4 large FETs) can exceed junction-temperature limits at high ambient. Estimated: with 4 vias to a 1 square-inch inner copper pour on a 4-layer JEDEC board, theta_JA is approximately 28 C/W; at 0.5 W dissipation, junction rises only 14 C above ambient. Always follow the ADI LT3790 datasheet PCB layout guidelines for SW1/SW2 trace geometry.
Place the input capacitors (CIN), the inductor (L1), and the output capacitors (COUT) on the same PCB layer as the LT3790EFE, with the shortest possible loop between VIN-PGND-SW1 and SW2-VOUT-PGND. Keep the SENSE/SENSEN differential traces routed as a tight pair away from the SW1/SW2 switching nodes to avoid noise coupling into the current-sense loop. The BST1 and BST2 bootstrap capacitors should be placed as close to the IC BST and SW pins as possible. Use a single ground plane split under the IC with analog ground (GND) and power ground (PGND) joined only at the IC's exposed pad - this prevents switching noise from corrupting the sensitive FB and ITH analog signals.
Do not exceed the 60V absolute maximum on VIN even during transient events; add a TVS clamp or RC snubber to absorb automotive load-dump or industrial surge transients. The SENSE pin common-mode range is limited - place the sense resistor in the right leg per the datasheet typical application, not the left. The SYNC pin accepts a clock pulse but the duty-cycle range is constrained - do not drive SYNC with a 50% duty signal outside the specified range. The SS (soft-start) capacitor should be at least 10 nF to limit inrush current at startup; smaller values cause inductor saturation. Finally, do not float the OVLO or UVLO pins - either tie to VREF via a resistor divider or to GND if unused.
The LT3790EFE current-mode control loop requires compensation on the ITH pin; use the Type-II network (Rith-Cith in series, paralleled with Cfilt) from the typical application circuit. Select Rith for crossover at 1/10 of the switching frequency (i.e., 20-70 kHz for 200-700 kHz RT), and adjust Cfilt for adequate phase margin (target 60 degrees). For noise-sensitive applications, place a small ceramic bypass (100 nF) directly at the INTVCC pin to filter the internal 5V LDO that supplies the gate drivers. The VREF pin should also have a local 100 nF bypass to ground.
معلومات الامتثال
RoHS and REACH compliant per the #PBF suffix and Analog Devices product page. Not AEC-Q100 qualified by default - choose the LT3790HFE#PBF (H-grade) variant for high-temperature automotive applications. Halogen-free status not explicitly stated in available data.
