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Analog Devices Inc. LT3790HFE#PBF
- Part No.:
- LT3790HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3790HFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LT3790HFE#PBF from Analog Devices is a 60V synchronous 4-switch buck-boost controller IC designed for high-efficiency voltage/current regulation in automotive and industrial power systems. It supports input voltages from 4.7V to 60V, regulates output voltage (1.2V–60V) with ±2% accuracy, output current with ±6% accuracy, and input current - enabling seamless transitions between buck, boost, and buck-boost modes without top-FET refresh cycles. It delivers up to 120W (24V/5A) in single-phase operation.
For engineers reviewing the LT3790HFE#PBF datasheet, LT3790HFE#PBF pinout, LT3790HFE#PBF application, or LT3790HFE#PBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, 38-lead TSSOP package with exposed pad, integrated input/output current monitoring, C/10 charge termination flag, and 200kHz–700kHz programmable switching frequency.
Technical Context
The LT3790HFE#PBF implements a constant-frequency current-mode control architecture with independent input current sense (IVINP/IVINN), output current sense (ISP/ISN), and voltage feedback (FB) loops. Its priority-based regulation logic selects the dominant loop (voltage, output current, or input current) in real time, ensuring stable operation across wide VIN/VOUT ratios.
It features dual gate drivers (TG1/BG1 and TG2/BG2) supporting external N-channel MOSFETs, internal 5V INTVCC regulator, and dedicated pins for soft-start (SS), synchronization (SYNC), clock output (CLKOUT), and fault signaling (C/10, SHORT). The controller eliminates top-FET refresh in buck/boost by using charge-sharing bootstrap techniques.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive and high-temp industrial environments. |
| Input Voltage Range | 4.7V to 60V - supports 12V/24V/48V battery systems and wide-input industrial supplies. |
| Output Voltage Accuracy | ±2% (1.2V ≤ VOUT < 60V) - enables precise CV regulation for battery charging and regulated rails. |
| Output Current Accuracy | ±6% (0V ≤ VOUT < 60V) - sufficient for CC/CV battery charger implementations with external sensing. |
| Switching Frequency | 200kHz to 700kHz (RT-programmable) - balances efficiency, EMI, and magnetics size. |
| Current Sense Thresholds | V(IVINP–IVINN) = 50mV typ; V(ISP–ISN) = 60mV typ - sets input/output current limits with 20× monitor gain (IVINMON/ISMON). |
| Package | 38-lead TSSOP with exposed thermal pad - θJA = 28°C/W; requires PCB soldering of exposed pad to SGND for thermal performance. |
Pinout & Package
LT3790HFE#PBF uses a 38-lead plastic TSSOP package (FE) with exposed pad (Pin 39) connected to SGND. Thermal performance requires soldering the exposed pad directly to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CTRL) | Output current threshold adjust | Sets V(ISP–ISN) trip point linearly (0–1.1V → 0–60mV); connect to VREF for default 60mV setting. |
| Pin 9 (EN/UVLO) | Enable / undervoltage lockout | 1.2V falling threshold with 15mV hysteresis; sub-µA bias above threshold; pulls 3µA below to enable hysteresis. |
| Pins 14, 24 (TG1, TG2) | Top gate drivers | Drive external high-side N-MOSFETs with bootstrapped voltage (INTVCC + SWx); no refresh cycle needed. |
| Pins 18, 19 (BG1, BG2) | Bottom gate drivers | Drive low-side N-MOSFETs from INTVCC to PGND; 3Ω pull-up / 1.2Ω pull-down typical at 5V. |
| Pins 25–26 (ISP, ISN) | Output current sense inputs | Differential inputs for output current shunt; common-mode range 0–60V; 60mV threshold with 20× ISMON gain. |
| Pins 10–11 (IVINP, IVINN) | Input current sense inputs | Differential inputs for input current shunt; common-mode range 3–60V; 50mV threshold with 20× IVINMON gain. |
| Pin 37 (FB) | Voltage feedback input | Regulates output voltage to 1.2V reference; transconductance amplifier drives VC pin for loop compensation. |
| Pins 30 & 39 (SGND) | Signal ground | Reference for all small-signal pins; must be connected to PGND at single point to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Enables continuous VIN > VOUT, VIN < VOUT, and VIN ≈ VOUT operation without mode-switching discontinuities. |
| No top-FET refresh cycle | Eliminates unnecessary switching loss in buck/boost regions via internal charge-sharing, improving efficiency by ~1–2%. |
| Integrated current monitors | IVINMON and ISMON provide 20× amplified outputs for input/output current sensing - simplifies parallel operation and telemetry. |
| C/10 and SHORT fault flags | Open-drain status pins assert when output current drops below C/10 threshold (~5mV) or FB falls below 400mV with valid current. |
| 180° phase-shifted CLKOUT | Enables synchronized interleaving of two LT3790HFE#PBF controllers to double power capability and reduce input/output ripple. |
| Programmable CCM/DCM mode | CCM pin selects forced continuous conduction (heavy load) or discontinuous mode (light load) to optimize light-load efficiency. |
Applications
| Automotive Battery Charger | Industrial 48V DC-DC Regulator |
|---|---|
|
Use Scenario: Charging 12V/24V lead-acid or LiFePO₄ batteries from variable vehicle alternator or start-stop system supply (6V–60V). IC Role / Device Role / Timing Role: Primary buck-boost controller regulating both constant-current (CC) and constant-voltage (CV) phases; uses ISP/ISN for output current regulation and FB for final CV stage. Use Value: Seamless transition between buck (VIN > VBAT) and boost (VIN < VBAT) avoids charging interruption during engine cranking or low-battery conditions. |
Use Scenario: Regulating stable 24V or 36V output from wide-range 36V–60V industrial bus for PLC I/O modules or sensors. IC Role / Device Role / Timing Role: Voltage-regulated buck-boost controller with EN/UVLO for brownout protection and OVLO for overvoltage shutdown. Use Value: ±2% VOUT accuracy and 60V absolute max rating ensure reliable operation across fluctuating factory power rails and transient surges. |
| Telecom 48V Backup Power | High-Power Portable Equipment Supply |
|
Use Scenario: Maintaining 48V output from supercapacitor bank (12V–50V) during AC mains failure in telecom base station equipment. IC Role / Device Role / Timing Role: Bidirectional-capable controller managing capacitor discharge (boost) and recharge (buck) with input current limiting via IVINP/IVINN. Use Value: Input current regulation prevents capacitor over-discharge; C/10 flag signals end-of-charge during recharge cycles. |
Use Scenario: Powering 20V–24V motor drives or displays from 12V/24V battery packs in portable test equipment or medical carts. IC Role / Device Role / Timing Role: High-efficiency (up to 98.5%) buck-boost controller delivering up to 5A continuous output with thermal shutdown at 150°C junction. Use Value: 38-lead TSSOP package with exposed pad enables compact layout and robust thermal management in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Same 4-switch architecture but rated only to 125°C junction; lacks C/10 and SHORT flags; no CLKOUT for interleaving. | Not suitable for under-hood automotive or high-temp industrial use; limited fault diagnostics. | Select LT3790HFE#PBF when 150°C operation, integrated charge termination, or multi-phase scalability are required. |
| MPQ4332GJ-AEC1-Z | Monolithic 4-switch buck-boost (integrated MOSFETs); 36V max input; fixed 500kHz frequency; no input current regulation. | Lower power (≤60W), simpler layout, but cannot support >36V inputs or independent input current limiting. | Choose LT3790HFE#PBF for >36V input, >60W output, or designs requiring programmable frequency and dual current-loop control. |
Compared with LTC3780EFE#PBF and MPQ4332GJ-AEC1-Z, the LT3790HFE#PBF uniquely combines 150°C operation, full input/output current regulation, C/10/SHORT status flags, and CLKOUT-enabled interleaving - making it the only option for high-reliability, high-power, thermally demanding buck-boost applications.
Availability
LT3790HFE#PBF is available at Aetrix Electronics and suitable for automotive battery chargers, industrial 48V DC-DC regulators, and telecom backup power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3790HFE#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3790HFE#PBF belongs to Analog Devices' high-voltage power controller product line, engineered specifically for robust, high-efficiency bidirectional DC-DC conversion in harsh thermal and electrical environments.
FAQ
What is the maximum operating junction temperature for the LT3790HFE#PBF?
The LT3790HFE#PBF is specified for continuous operation from –40°C to 150°C junction temperature, making it suitable for under-hood automotive applications and high-temperature industrial environments where standard commercial-grade controllers would fail. This rating is verified per Analog Devices' H-grade qualification testing and exceeds the 125°C limit of the E/I-grade variants.
Does the LT3790HFE#PBF support input current regulation?
Yes, the LT3790HFE#PBF supports precise input current regulation using the IVINP and IVINN pins. When the differential voltage across these pins reaches 50mV (typical), the controller enters constant-input-current mode. The IVINMON pin provides a 20× amplified monitor output (1V at 50mV), enabling accurate telemetry and closed-loop control in applications like supercapacitor charging or input surge limiting.
How does the LT3790HFE#PBF handle transitions between buck, boost, and buck-boost modes?
The LT3790HFE#PBF uses a proprietary current-mode architecture that continuously evaluates input voltage, output voltage, and inductor current to determine optimal switch states. It achieves seamless, glitch-free transitions by dynamically adjusting duty cycles and gate drive timing - eliminating voltage dips or current spikes during mode changes, as confirmed in typical application waveforms (Figures 3–6 of the datasheet).
Can multiple LT3790HFE#PBF controllers be synchronized for higher power output?
Yes, the LT3790HFE#PBF includes a dedicated SYNC pin for external clock synchronization and a 180° phase-shifted CLKOUT pin. Two or more devices can be interleaved by connecting CLKOUT of one to SYNC of another, enabling balanced current sharing, reduced input/output ripple, and scalable power delivery - demonstrated in the 120W reference design (TA01a) and validated in parallel operation application notes.
What is the purpose of the C/10 and SHORT pins on the LT3790HFE#PBF?
The C/10 pin asserts an open-drain low signal when the output current falls below ~5mV across the ISP–ISN sense resistor - indicating end-of-charge in battery applications. The SHORT pin asserts low when FB drops below ~400mV while output current remains valid - signaling an output short-circuit condition. Both require external pull-up resistors and provide hardware-level fault detection independent of microcontroller supervision.
LT3790HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.7V ~ 60V
- Frequency - Switching:
- 200kHz ~ 700kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3790HFE#PBF FAQ
1.How can I place an order for LT3790HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3790HFE#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3790HFE#PBF reliable?
The price and inventory of LT3790HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3790HFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3790HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3790HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3790HFE#PBF?
LT3790HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3790HFE#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3790HFE#PBF?
For technical support, including LT3790HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3790HFE#PBF requirements.
6.How does Aetrix verify that LT3790HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3790HFE#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3790HFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3790HFE#PBF?
All LT3790HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3790HFE#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3790HFE#PBF part is unused and in its original packaging.
Return procedure for LT3790HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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