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Analog Devices Inc. LT3790IFE#TRPBF
- Part No.:
- LT3790IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3790IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,020
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Product details
Overview
LT3790IFE#TRPBF from Analog Devices is a 60V synchronous 4-switch buck-boost controller IC designed for voltage/current regulation in automotive, telecom, 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.
For engineers reviewing the LT3790IFE#TRPBF datasheet, LT3790IFE#TRPBF pinout, LT3790IFE#TRPBF application, or LT3790IFE#TRPBF equivalent, key selection considerations include its 38-lead TSSOP package with exposed pad, 200kHz–700kHz adjustable switching frequency, integrated input/output current monitoring, C/10 charge termination, and shorted-output flag functionality.
Technical Context
The LT3790IFE#TRPBF implements a constant-frequency current-mode control architecture with three independent feedback loops: output voltage (FB pin), output current (ISP/ISN + CTRL), and input current (IVINP/IVINN). Its proprietary 4-switch single-inductor topology enables continuous conduction mode operation across all VIN/VOUT relationships - including VIN = VOUT - using synchronized gate drivers (TG1/BG1/TG2/BG2) and dual bootstrap supplies (BST1/BST2).
It features dual current sense comparators with programmable thresholds (via CTRL and internal amplifiers), VC pin-based error amplifier compensation, and seamless region transition logic that eliminates discontinuities during buck-to-boost crossover. The device integrates dedicated status flags (C/10, SHORT), soft-start clamping, and 180° phase-shifted CLKOUT for parallel operation - all operating within –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.7V to 60V - supports wide-input applications including 12V/24V/48V automotive and industrial rails. |
| Switching Frequency | 200kHz to 700kHz - set via RT resistor or synchronized externally; enables optimized efficiency vs. size trade-offs. |
| Output Voltage Accuracy | ±2% over 1.2V ≤ VOUT < 60V - ensures stable regulation for battery charging and precision DC-DC conversion. |
| Output Current Accuracy | ±6% over 0V ≤ VOUT < 60V - critical for constant-current LED drivers and battery charge control. |
| Input Current Sense Threshold | 50mV (typical) at IVINP–IVINN - enables accurate input power limiting and source protection. |
| Output Current Sense Threshold | 60mV (typical) at ISP–ISN, adjustable down to 1mV via CTRL - supports flexible current limit programming. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial ambient conditions. |
| Package | 38-lead TSSOP with exposed thermal pad - provides low θJA (28°C/W) for high-power density designs. |
Pinout & Package
LT3790IFE#TRPBF is housed in a 38-lead plastic TSSOP package (FE) with exposed pad (Pin 39) soldered to SGND for thermal and electrical integrity. Pin pitch is 0.5mm; package dimensions are 9.7mm × 4.4mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL (1) | Output current threshold adjustment | Sets V(ISP–ISN) trip point from 1mV to 60mV linearly; 0V–1.1V range gives full scaling; >1.3V locks at 60mV. |
| SS (2) | Soft-start control | Charges external capacitor to ramp VC voltage gradually; prevents inrush current during startup. |
| PWM (3) | External enable/disable control | Low signal halts switching, disconnects VC, and forces PWMOUT low - used for system-level sequencing. |
| C/10 (4) | Charge termination flag | Open-drain output asserts when V(ISP–ISN) < 5mV - signals end-of-charge for Li-ion or lead-acid batteries. |
| SHORT (5) | Output short-circuit detection | Asserts when FB < 400mV AND V(ISP–ISN) > 5mV - indicates load fault while current is still flowing. |
| VREF (6) | 2.00V reference output | Stable 2V source (±2%) for biasing CTRL, divider networks, or external circuitry; drives up to 200µA. |
| ISMON (7) | Output current monitor | 20× V(ISP–ISN); outputs 1.2V at 60mV sense - enables analog current readback or master-slave paralleling. |
| IVINMON (8) | Input current monitor | 20× V(IVINP–IVINN); outputs 1.0V at 50mV sense - supports input power measurement and foldback. |
| EN/UVLO (9) | Enable & undervoltage lockout | 1.2V falling threshold with 15mV hysteresis; sub-µA bias above threshold; 3µA pull-down below threshold. |
| IVINP/IVINN (10,11) | Differential input current sense inputs | Accept 3V–60V common-mode; 50mV threshold sets input current limit; gm = 2.12mS for fast response. |
| VIN (12) | Main input supply | Primary power rail (4.7V–60V); powers internal LDO (INTVCC) and gate drivers; requires local 4.7µF ceramic bypass. |
| INTVCC (13) | Internal 5V regulator output | 5.0V ±2% regulated supply (4.8V–5.2V); powers control logic and gate drivers; dropout < 350mV at –10mA. |
| TG1/BG1 (14,18) | Top/bottom gate drivers for SW1 | TG1: N-channel high-side driver (VBST1–SW1 referenced); BG1: N-channel low-side driver (PGND referenced). |
| BST1/SW1 (15,16) | Bootstrap supply & switch node 1 | BST1 floats ~5V above SW1; SW1 swings from diode drop below PGND to VIN - defines buck-stage switching node. |
| PGND (17,20) | Power ground | High-current return path for bottom FETs and input/output capacitors; must be connected near MOSFET sources. |
| BG2/TG2 (19,24) | Bottom/top gate drivers for SW2 | BG2: N-channel low-side driver (SGND referenced); TG2: N-channel high-side driver (VBST2–SW2 referenced). |
| SW2/BST2 (21,22) | Switch node 2 & bootstrap supply | SW2 swings from diode drop below SGND to VOUT; BST2 floats ~5V above SW2 - defines boost-stage switching node. |
| ISP/ISN (25,26) | Differential output current sense inputs | 0V–60V common-mode range; 60mV default threshold; gm = 1650µS; supports bidirectional sensing. |
| SNSP/SNSN (27,28) | Current comparator inputs | Compare VC-derived threshold against sensed inductor current; SNSP connects to ISP via RC network. |
| TEST1 (29) | Factory test pin | Must be tied to SGND for normal operation; floating or incorrect connection disables device functionality. |
| SGND (30,39) | Signal ground | Reference for all small-signal pins (FB, CTRL, SS, etc.); connect to PGND at single-point star ground. |
| PWMOUT (31) | Buffered PWM output | INTVCC-referenced open-drain output; drives external N-MOSFET for load disconnect; RON < 20Ω. |
| CCM (32) | Continuous conduction mode control | >1.5V = forced CCM; <0.3V = DCM; used to block reverse inductor current at light loads. |
| CLKOUT (33) | 180° phase-shifted clock output | Enables precise interleaving of two LT3790 devices for higher power and reduced input ripple. |
| SYNC (34) | External clock synchronization input | Accepts 200kHz–700kHz square wave; rising edge synchronizes buck clock; boost clock is phase-inverted. |
| RT (35) | Frequency set resistor | Resistor to SGND sets oscillator frequency: 147kΩ = 200kHz, 59kΩ = 400kHz, 29.1kΩ = 700kHz. |
| VC (36) | Error amplifier output & current threshold | 0.7V–1.9V control voltage; sets peak inductor current; also serves as compensation node for voltage loop. |
| FB (37) | Voltage feedback input | Regulates to 1.20V ±1.5%; transconductance amplifier (565µS) drives VC; line regulation < 0.025%/V. |
| OVLO (38) | Overvoltage lockout input | 3.0V rising threshold (±75mV hysteresis); pulls SS low and halts switching if VOUT exceeds safe level. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Enables VIN > VOUT, VIN < VOUT, and VIN = VOUT operation without topology change or control discontinuity. |
| No top-FET refresh cycle | Eliminates unnecessary switching losses in buck/boost modes via unique charge-sharing technique - improves efficiency by ~1–2%. |
| Integrated current monitoring | Separate high-accuracy inputs for input (IVINP/IVINN) and output (ISP/ISN) current sensing with dedicated monitor outputs (IVINMON/ISMON). |
| C/10 and SHORT status flags | Dedicated open-drain outputs signal battery charge completion (C/10) and output short-circuit condition (SHORT) for system-level fault handling. |
| Parallel capability with CLKOUT | 180° out-of-phase clock output allows precise interleaving of two LT3790 controllers - doubles power capacity while reducing input/output ripple. |
| VOUT disconnection during shutdown | Internal switches isolate output from input when EN/UVLO is low - prevents backfeed and enables true load disconnect. |
Applications
| Automotive 12V/48V DC-DC Conversion | Industrial Battery Charging System |
|---|---|
|
Use Scenario: Regulating 12V battery input to stable 24V or 48V rail for ADAS cameras, infotainment, or ECU modules where input voltage varies widely during cold crank or load dump. IC Role / Device Role / Timing Role: Primary 4-switch buck-boost controller managing bidirectional power flow, input current limiting, and seamless mode transitions across 6V–16V VIN range. Use Value: Maintains regulated output despite ±30% VIN variation; achieves >95% efficiency at 5A; supports C/10 termination for auxiliary LiFePO₄ packs. |
Use Scenario: Charging 24V/36V lead-acid or lithium iron phosphate batteries from variable solar or generator sources with input ranging from 18V to 60V. IC Role / Device Role / Timing Role: Constant-voltage/constant-current charger controller with programmable output current (via CTRL), input current foldback, and charge termination signaling. Use Value: Delivers 100W+ per IC; uses IVINMON for MPPT-compatible input power capping; C/10 flag triggers charge cutoff without microcontroller intervention. |
| Telecom 48V Backup Power Supply | High-Power Portable Equipment |
|
Use Scenario: Providing uninterrupted 48V output from either AC/DC adapter (54V) or backup supercapacitor bank (20V–45V) in base station power systems. IC Role / Device Role / Timing Role: Bidirectional buck-boost regulator with input/output current monitoring, OVLO protection, and automatic source switchover based on voltage priority. Use Value: Eliminates need for separate buck and boost stages; maintains 48V ±0.5V regulation across full input range; SHORT flag detects failed downstream converters. |
Use Scenario: Powering portable medical devices or test equipment requiring 12V/19V/24V outputs from multi-cell Li-ion packs (10V–28V) with strict efficiency and thermal constraints. IC Role / Device Role / Timing Role: High-efficiency, thermally optimized DC-DC controller in 38-TSSOP package with exposed pad for PCB heat sinking. Use Value: Achieves 98.5% peak efficiency at 200kHz; operates reliably at 125°C junction; supports parallel configuration for >150W scalable output. |
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 limited to 40V max VIN/VOUT; no C/10 or SHORT flags; fixed 60mV output current threshold. | Lacks integrated charge termination and short-detection logic - requires external comparators for battery charging safety functions. | Select LTC3780EFE#PBF only for cost-sensitive non-battery applications where 40V rating suffices and flag signals are unnecessary. |
| MPQ4333AGL-AEC1-Z | Automotive-grade 36V 4-switch buck-boost controller; integrates MOSFETs; fixed 2.2MHz frequency; no input current sensing or programmable output current. | Monolithic solution with lower BOM count but no IVINP/IVINN inputs or CTRL-adjustable current limit - unsuitable for precision input power management. | Choose MPQ4333AGL-AEC1-Z for space-constrained AEC-Q100 automotive designs needing integrated FETs and high-frequency operation, not for programmable current control. |
Compared with LTC3780EFE#PBF and MPQ4333AGL-AEC1-Z, the LT3790IFE#TRPBF uniquely combines 60V rating, dual current sensing (input + output), programmable output current threshold, and dedicated safety flags - making it the only option for high-power, safety-critical battery charging and wide-VIN industrial power supplies.
Availability
LT3790IFE#TRPBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial battery charging, and telecom backup power systems requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade performance.
Supply support for LT3790IFE#TRPBF 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#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC-DC controllers, engineered specifically for robust, high-efficiency buck-boost conversion in harsh environments with wide input/output ranges and advanced protection features.
FAQ
What is the maximum input voltage supported by the LT3790IFE#TRPBF?
The LT3790IFE#TRPBF supports a maximum input voltage of 60V, as specified in its Absolute Maximum Ratings. This rating applies continuously across its full operating temperature range of –40°C to +125°C. Exceeding 60V on the VIN pin may cause permanent damage. The device is designed for automotive, industrial, and telecom applications where input rails can reach 48V or higher, including transient conditions like load dump.
Does the LT3790IFE#TRPBF support both constant-voltage and constant-current regulation simultaneously?
No - the LT3790IFE#TRPBF implements priority-based regulation: the highest active feedback loop dominates. If output current demand exceeds the programmed limit, the output current loop takes precedence and reduces output voltage to maintain constant current. Conversely, if load current falls below the limit, the voltage loop regulates FB to 1.20V. This ensures safe, stable operation in battery charging and LED driving applications without conflict between loops.
How does the LT3790IFE#TRPBF handle transitions between buck, boost, and buck-boost operating regions?
The LT3790IFE#TRPBF uses proprietary control logic to manage seamless transitions without discontinuities. As VIN approaches VOUT, it automatically enters a 4-switch buck-boost region where all four MOSFETs are actively controlled in overlapping phases. The device avoids dead-time issues and maintains continuous inductor current, eliminating output voltage glitches or audible noise during crossover - verified in typical application circuits with 12V–24V input/output ranges.
Can the LT3790IFE#TRPBF be used in parallel configurations, and how is synchronization achieved?
Yes - the LT3790IFE#TRPBF supports precise parallel operation via its CLKOUT and SYNC pins. One device's CLKOUT (180° phase-shifted) drives another's SYNC input, ensuring interleaved switching. This halves input/output ripple current and doubles total power capacity beyond 100W. External resistors must match RT values, and ISMON/CTRL connections coordinate current sharing between master and slave controllers.
What is the function of the C/10 pin on the LT3790IFE#TRPBF, and how is it implemented in battery charging?
The C/10 pin on the LT3790IFE#TRPBF is an open-drain output that asserts low when the output current falls below ~5mV across the ISP–ISN sense resistor - indicating C/10 charge termination for lithium-based batteries. In practice, it requires an external pull-up resistor to INTVCC or VOUT. When asserted, it signals the host system to stop charging, enabling fully autonomous charge termination without microcontroller polling of analog signals.
LT3790IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3790IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3790IFE#TRPBF 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#TRPBF reliable?
The price and inventory of LT3790IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3790IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3790IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3790IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3790IFE#TRPBF?
LT3790IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3790IFE#TRPBF 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#TRPBF?
For technical support, including LT3790IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3790IFE#TRPBF requirements.
6.How does Aetrix verify that LT3790IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3790IFE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3790IFE#TRPBF?
All LT3790IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3790IFE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT3790IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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