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Analog Devices Inc. LT3790IFE#PBF
- Part No.:
- LT3790IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3790IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:843
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Product details
Overview
LT3790IFE#PBF from Analog Devices is a 60V synchronous 4-switch buck-boost controller IC that regulates output voltage, output current, or input current across input voltages from 4.7V to 60V - including VIN above, below, or equal to VOUT. It delivers up to 120W (24V/5A), achieves 98.5% efficiency, and features 2% output voltage accuracy (1.2V–60V) and 6% output current accuracy for battery/super-capacitor charging in automotive and industrial power systems.
For engineers reviewing the LT3790IFE#PBF datasheet, LT3790IFE#PBF pinout, LT3790IFE#PBF application, or LT3790IFE#PBF equivalent, key selection criteria include its seamless buck/boost/buck-boost mode transitions, dual current monitoring (IVINMON/ISMON), C/10 charge termination flag, and 38-lead TSSOP package with exposed pad for thermal management.
Technical Context
The LT3790IFE#PBF implements a constant-frequency current-mode architecture with adjustable switching frequency from 200kHz to 700kHz via RT pin resistor. Its proprietary 4-switch single-inductor topology eliminates top-FET refresh cycles in pure buck or boost operation, reducing switching losses and EMI.
It integrates independent input and output current sense amplifiers (gm = 2.12mS and 1650µS), precision reference (VREF = 2.00V ±2%), and dual feedback loops (FB for voltage regulation at 1.20V ±0.012V; VC for current control). Mode transitions between buck, buck-boost, and boost are continuous and controlled by duty-cycle-dependent gate drive sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.7V to 60V - supports wide-range inputs including 12V/24V/48V automotive and telecom rails without pre-regulation. |
| Output Voltage Accuracy | ±2% (1.2V ≤ VOUT < 60V) - ensures stable battery charging or regulated supply under line/load variation. |
| Output Current Accuracy | ±6% (0V ≤ VOUT < 60V) - enables precise constant-current sourcing for supercapacitor charging or LED drivers. |
| Switching Frequency | 200kHz–700kHz (RT-programmable) - allows optimization of size (higher fSW) vs. efficiency (lower fSW) and EMI compliance. |
| Efficiency | Up to 98.5% - achieved via synchronous 4-switch operation and elimination of top-FET refresh cycles. |
| Package | 38-lead TSSOP with exposed pad - provides low θJA (28°C/W) for high-power thermal dissipation in compact layouts. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
LT3790IFE#PBF uses a 38-lead plastic TSSOP package with exposed pad (Pin 39) soldered to SGND for thermal and electrical integrity. Pin functions are validated per Analog Devices' official datasheet Rev. B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL (1) | Output current threshold adjust | Sets V(ISP-ISN) trip point linearly (0–1.1V → 0–60mV); default 60mV when tied to VREF. |
| SS (2) | Soft-start control | Charges external capacitor to ramp VC voltage, limiting inrush current during startup. |
| PWM (3) | External shutdown control | Low signal disables all switching and disconnects VC from external loads; internal 90kΩ pull-down. |
| C/10 (4) | Charge termination flag | Open-drain output asserts when V(ISP-ISN) < 5mV - used to terminate battery charging at C/10 rate. |
| SHORT (5) | Output short detection | Asserts when FB < 400mV AND V(ISP-ISN) > 5mV - indicates output overcurrent or short-circuit condition. |
| VREF (6) | 2.00V precision reference | Stable 2V output (±2%) supplies bias for CTRL divider and external compensation networks. |
| ISMON (7) | Output current monitor | 20× scaled V(ISP-ISN); outputs 1.2V at 60mV sense - enables parallel IC current sharing. |
| IVINMON (8) | Input current monitor | 20× scaled V(IVINP-IVINN); outputs 1.0V at 50mV sense - supports input current limiting and telemetry. |
| EN/UVLO (9) | Enable & undervoltage lockout | 1.20V falling threshold with 15mV hysteresis; sub-µA bias above threshold, 3µA pull-down below. |
| ISP/ISN (25/26) | Output current sense inputs | Differential pair for shunt resistor connection; common-mode range 0–60V supports high-side sensing. |
| IVINP/IVINN (10/11) | Input current sense inputs | Differential pair with 3–60V common-mode range - enables accurate input current regulation regardless of VIN level. |
| TG1/BG1 (14/18), TG2/BG2 (24/19) | N-channel gate drivers | TGx: 2.6Ω pull-up / 1.7Ω pull-down; BGx: 3Ω pull-up / 1.2Ω pull-down - drives external MOSFETs directly. |
| SW1/SW2 (16/21) | Switch node connections | High dv/dt nodes connected to inductor; require tight layout and low-inductance routing. |
| SGND (30, 39) | Signal ground reference | Exposed pad (Pin 39) must be soldered to PCB ground plane - critical for noise immunity and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Enables seamless VIN > VOUT (buck), VIN < VOUT (boost), and VIN ≈ VOUT (buck-boost) operation without mode discontinuities. |
| No top-FET refresh cycle | Eliminates unnecessary switching loss and EMI in pure buck/boost modes - improves efficiency and simplifies gate drive timing. |
| Dual independent current regulation | Simultaneous input current limit (via IVINP/IVINN) and output current limit (via ISP/ISN) with dedicated monitor outputs (IVINMON/ISMON). |
| C/10 charge termination & SHORT flag | Hardware-level battery charge end-of-life signaling and real-time output short detection - reduces MCU firmware overhead. |
| Parallel capability via CLKOUT/SYNC | 180° out-of-phase CLKOUT enables synchronized interleaving of multiple LT3790IFE#PBF controllers for >100W scalable power delivery. |
| Robust fault protection | Includes OVLO (3.0V ±150mV), thermal shutdown, soft-start reset on UVLO, and V(SNSP-SNSN) overcurrent thresholds for buck (–39mV) and boost (+60mV). |
Applications
| Automotive 12V/24V DC-DC Conversion | Industrial Telecom Power Supply |
|---|---|
Use Scenario: Regulating 24V battery output to stable 12V rail for infotainment and ADAS modules while supporting cold-crank (4.7V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Primary buck-boost controller managing bidirectional power flow, input current limiting, and output voltage regulation. Use Value: Eliminates need for separate buck + boost converters; maintains regulation across full automotive voltage range with <2% VOUT error. | Use Scenario: Providing 48V PoE++ midspan power with programmable current limit and remote charge termination for backup battery banks. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger controller with IVINMON telemetry and C/10 hardware flag for battery management. Use Value: Enables precise 6% current accuracy and automatic charge cutoff without host MCU polling - reduces system latency and firmware complexity. |
| High-Power USB PD Sink | Supercapacitor Backup System |
Use Scenario: Accepting variable-input USB PD 3.0/PPS (3.3–21V) and delivering regulated 5V/20A (100W) to downstream devices. IC Role / Device Role / Timing Role: Adaptive buck-boost regulator with fast transient response and synchronous gate drive for high-efficiency conversion. Use Value: Achieves 98.5% peak efficiency and seamless mode transitions - avoids voltage droop during PPS voltage steps. | Use Scenario: Charging and discharging 2.7V/300F supercapacitor stack from 12V vehicle bus for emergency memory retention or ride-through during engine start. IC Role / Device Role / Timing Role: Bidirectional current-controlled power stage with independent input/output current sensing and reverse-current blocking. Use Value: Supports true bidirectional energy flow with <6% current accuracy in both charge and discharge directions - enables precise state-of-charge estimation. |
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 fixed 300kHz–400kHz range; no C/10 or SHORT flags; lower max VIN (40V). | Lacks hardware charge termination and short detection - requires external logic for battery safety functions. | Select when cost sensitivity outweighs need for integrated battery management features and 60V rating is unnecessary. |
| MPQ4332GLED-A | Monolithic 4-switch buck-boost IC (integrated MOSFETs); 3.3V–40V input; 12A max; no input current sense or IVINMON output. | Not suitable for >40V or input-current-regulated applications; limited to lower-power designs with integrated FET constraints. | Choose for space-constrained, lower-power (<100W) designs where board area and BOM count are prioritized over flexibility and 60V robustness. |
Compared with LTC3780EFE#PBF and MPQ4332GLED-A, the LT3790IFE#PBF uniquely combines 60V operation, dual current monitoring with dedicated analog outputs, hardware C/10/SHORT flags, and full 200–700kHz programmability - making it optimal for high-reliability, feature-rich battery charging and wide-input industrial power systems.
Availability
LT3790IFE#PBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial telecom supplies, high-power USB PD sinks, and supercapacitor backup systems requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade performance.
Supply support for LT3790IFE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3790IFE#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, wide-input-range DC-DC conversion in mission-critical power systems where reliability, precision regulation, and multi-mode flexibility are essential.
FAQ
What is the maximum input voltage supported by the LT3790IFE#PBF?
The LT3790IFE#PBF supports a maximum input voltage of 60V, as specified in its Absolute Maximum Ratings and confirmed across all operating conditions. This rating enables direct integration into 48V telecom systems, 24V/36V industrial buses, and automotive applications subject to load-dump transients. Operation beyond 60V risks permanent device damage.
Does the LT3790IFE#PBF support both buck and boost operation in the same design?
Yes, the LT3790IFE#PBF natively supports seamless transitions between buck (VIN > VOUT), boost (VIN < VOUT), and buck-boost (VIN ≈ VOUT) modes using its 4-switch single-inductor topology. No external reconfiguration or mode-select pins are required - the controller automatically sequences gate drives based on sensed duty cycle and feedback conditions.
How does the C/10 pin function on the LT3790IFE#PBF?
The C/10 pin on the LT3790IFE#PBF is an open-drain output that asserts (pulls low) when the output current sense voltage V(ISP-ISN) falls below 5mV (typical), indicating the battery has reached C/10 charge termination. An external pull-up resistor is required; the pin's 1.1–2.0kΩ output impedance ensures reliable interfacing with microcontrollers or discrete logic.
Can the LT3790IFE#PBF regulate input current independently of output voltage?
Yes, the LT3790IFE#PBF provides independent input current regulation via the IVINP/IVINN differential inputs and IVINMON monitor output. When V(IVINP-IVINN) reaches 50mV (typical), the controller enters constant-input-current mode - useful for limiting source current in solar chargers or protecting upstream converters, regardless of output voltage setting.
What thermal considerations apply to the LT3790IFE#PBF's exposed pad?
Pin 39 (exposed pad) of the LT3790IFE#PBF is SGND and must be soldered directly to a large PCB copper pour for thermal and electrical performance. With θJA = 28°C/W, proper pad soldering and thermal vias to inner ground planes are essential to maintain junction temperature ≤125°C at full 120W operation - especially in enclosed or high-ambient environments.
LT3790IFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3790IFE#PBF FAQ
1.How can I place an order for LT3790IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3790IFE#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 LT3790IFE#PBF reliable?
The price and inventory of LT3790IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3790IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3790IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3790IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3790IFE#PBF?
LT3790IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3790IFE#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 LT3790IFE#PBF?
For technical support, including LT3790IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3790IFE#PBF requirements.
6.How does Aetrix verify that LT3790IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3790IFE#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 LT3790IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3790IFE#PBF?
All LT3790IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3790IFE#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 LT3790IFE#PBF part is unused and in its original packaging.
Return procedure for LT3790IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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