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Analog Devices Inc. LT3790MPFE#TRPBF
- Part No.:
- LT3790MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3790MPFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,585
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Product details
Overview
LT3790MPFE#TRPBF from Analog Devices is a 60V synchronous 4-switch buck-boost controller IC designed for high-power DC/DC regulation in automotive, industrial, and telecom systems. It regulates output voltage (1.2V–60V, ±2%), output current (±6% accuracy), and input current across wide input ranges (4.7V–60V), enabling seamless transitions between buck, boost, and buck-boost modes without top-FET refresh cycles.
For engineers reviewing the LT3790MPFE#TRPBF datasheet, LT3790MPFE#TRPBF pinout, LT3790MPFE#TRPBF application, or LT3790MPFE#TRPBF equivalent, key selection considerations include its –55°C to +150°C operating junction temperature, 38-lead TSSOP package with exposed pad, integrated input/output current monitoring, C/10 charge termination flag, and 200kHz–700kHz adjustable switching frequency.
Technical Context
The LT3790MPFE#TRPBF implements a constant-frequency current-mode architecture with three independent feedback loops-output voltage (FB pin, 1.2V reference), output current (ISP/ISN, 60mV threshold), and input current (IVINP/IVINN, 50mV threshold)-where the highest-priority loop dominates control. Its proprietary 4-switch topology eliminates dead-time diode conduction losses and enables true VIN-above/VOUT-below operation without mode-switching discontinuities.
It features dual gate drivers (TG1/BG1 and TG2/BG2) with verified on-resistances (2.6Ω pull-up / 1.7Ω pull-down for TGx; 3Ω/1.2Ω for BGx), internal 5V INTVCC regulator (4.8V–5.2V, 67mA limit), and synchronized clock output (CLKOUT) for parallel power scaling. The VC pin serves as unified error amplifier output and current threshold modulator (0.7V–1.9V range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.7V to 60V - supports 12V, 24V, and 48V automotive/industrial rails without external pre-regulation |
| Output Voltage Accuracy | ±2% (1.2V ≤ VOUT < 60V) - ensures stable battery charging or regulated bus voltage under load/line variation |
| Output Current Accuracy | ±6% (0V ≤ VOUT < 60V) - enables precise constant-current LED driving or battery charge termination |
| Switching Frequency | 200kHz to 700kHz (adjustable via RT resistor) - balances efficiency vs. EMI filtering size and thermal performance |
| Junction Temperature Range | –55°C to +150°C - qualified for extended-temperature automotive engine bay and industrial motor drive applications |
| Package | 38-lead TSSOP with exposed thermal pad (θJA = 28°C/W) - enables >100W operation with standard PCB copper pour |
| Current Sense Thresholds | V(ISP–ISN): 60mV (default), adjustable via CTRL pin; V(IVINP–IVINN): 50mV - provides direct shunt-based current regulation without gain calibration |
Pinout & Package
LT3790MPFE#TRPBF uses a 38-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 39 = SGND), requiring soldering to PCB ground plane for thermal and electrical integrity. θJA = 28°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | Output current sense differential inputs | Direct connection to shunt resistor; sets output current regulation point (60mV default) |
| IVINP / IVINN | Input current sense differential inputs | Enables input current limiting and monitoring (50mV threshold); critical for source protection |
| TG1 / BG1 / SW1 / BST1 | Buck-side gate drive and switch node | Controls upper/lower N-MOSFETs in buck path; BST1 supplies floating gate drive for TG1 |
| TG2 / BG2 / SW2 / BST2 | Boost-side gate drive and switch node | Controls upper/lower N-MOSFETs in boost path; BST2 supplies floating gate drive for TG2 |
| FB | Voltage feedback input | Regulates output voltage to 1.2V reference; supports resistive divider for any VOUT ≥1.2V |
| CTRL | Output current threshold adjustment | Linearly scales V(ISP–ISN) threshold from 0V to 1.1V (1/20× VCTRL); enables programmable current limits |
| VC | Error amplifier output & current comparator threshold | Unified control node (0.7V–1.9V) that sets peak inductor current; used for compensation and loop stability |
| EN/UVLO | Enable and undervoltage lockout | 1.2V falling threshold with 15mV hysteresis; sub-µA bias below threshold enables ultra-low shutdown IQ (0.1µA) |
| C/10 / SHORT | Open-drain status flags | C/10 asserts when V(ISP–ISN) < 5mV (charge termination); SHORT asserts when FB < 400mV & V(ISP–ISN) > 5mV (output short detection) |
| CLKOUT / SYNC | Phase-controlled clock interface | CLKOUT provides 180° out-of-phase oscillator signal; SYNC accepts external 200–700kHz clock for multi-phase synchronization |
Key Features
| Feature | Design Value |
|---|---|
| No top-FET refresh cycle in buck or boost | Eliminates unnecessary switching loss and gate driver stress during steady-state operation |
| VOUT disconnected from VIN during shutdown | Prevents backfeed through power stage; essential for battery-powered system safety and isolation |
| Integrated input/output current monitors (IVINMON, ISMON) | Provide 20× amplified outputs (1V at 50mV input, 1.2V at 60mV input) for analog telemetry or slave IC control |
| Parallel capability via CLKOUT/SYNC | Enables coherent interleaving of multiple LT3790MPFE#TRPBF controllers to scale output power beyond 100W |
| C/10 charge termination and SHORT fault flag | Hardware-level battery charge end-detection and output short-circuit response without microcontroller intervention |
| Continuous conduction mode (CCM) control via CCM pin | Allows forced CCM at heavy loads or DCM at light loads to optimize efficiency across full load range |
Applications
| Automotive 12V/48V Dual-Battery Systems | Industrial Telecom Power Supplies |
|---|---|
Use Scenario: Bidirectional power transfer between 12V starter battery and 48V mild-hybrid rail with seamless voltage inversion. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller managing bidirectional energy flow, regulating both VOUT and IOUT with ±2% voltage and ±6% current accuracy. Use Value: Enables single-stage conversion without intermediate DC/DC stages, reducing BOM count and improving system efficiency up to 98.5%. |
Use Scenario: High-reliability 48V telecom rectifier supplying 3.3V/12V/24V system rails with input surge tolerance and remote monitoring. IC Role / Device Role / Timing Role: Primary DC/DC controller providing input current limiting, output voltage regulation, and fault flagging (C/10, SHORT) for system-level supervision. Use Value: Delivers stable output under wide-line (4.7V–60V) and wide-load conditions while supporting hot-swap and redundancy requirements. |
| High-Power Battery Chargers | LED Driver for Street Lighting |
Use Scenario: Constant-current/constant-voltage lithium-ion or supercapacitor charger for EV auxiliary systems or grid storage. IC Role / Device Role / Timing Role: Regulates charging current (via ISP/ISN) and terminal voltage (via FB) with hardware-based C/10 termination and overvoltage lockout (OVLO). Use Value: Eliminates need for external microcontroller-based charge management; supports –55°C cold-start and 150°C under-hood operation. |
Use Scenario: High-efficiency constant-current driver for 100W+ LED arrays in outdoor lighting with dimming and fault reporting. IC Role / Device Role / Timing Role: Output current regulator using ISP/ISN sensing and PWMOUT-driven MOSFET for LED string disconnect; supports analog/digital dimming via CTRL and VC pins. Use Value: Achieves >98% efficiency at full load while providing real-time current telemetry (ISMON) and open/short LED detection. |
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#TRPBF | Same 4-switch architecture but rated only to 125°C junction; lacks C/10 and SHORT flags; no CLKOUT for parallel sync | Suitable for commercial/industrial ambient environments only; not qualified for extended-temperature automotive use | Select LT3790MPFE#TRPBF when –55°C operation, hardware charge termination, or multi-phase scalability are required. |
| MPQ4332GJ-AEC1-Z | Monolithic 4-switch buck-boost (integrated MOSFETs); max 36V input; fixed 500kHz fSW; no input current sense or CCM control | Targeted at space-constrained consumer/automotive infotainment; limited to lower power (<60W) and narrower voltage range | Choose LT3790MPFE#TRPBF for >100W designs, 60V capability, discrete FET flexibility, and dual current-loop regulation. |
Compared with LTC3780EFE#TRPBF and MPQ4332GJ-AEC1-Z, the LT3790MPFE#TRPBF uniquely combines extended temperature qualification (–55°C to +150°C), dual independent current regulation (input + output), hardware charge termination (C/10), and scalable parallel operation-making it the only option for high-reliability, high-power, wide-input automotive and industrial buck-boost systems.
Availability
LT3790MPFE#TRPBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial telecom rectification, and high-power battery charging applications requiring stable component supply, long-term lifecycle support, and extended temperature performance.
Supply support for LT3790MPFE#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 precision instrumentation, industrial automation, and automotive markets.
The LT3790MPFE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, high-reliability DC/DC conversion in harsh-environment applications demanding wide input range, precise current/voltage regulation, and robust fault protection.
FAQ
What is the operating junction temperature range for the LT3790MPFE#TRPBF?
The LT3790MPFE#TRPBF is specified for an operating junction temperature range of –55°C to +150°C. This extended range is validated per the MP-grade qualification standard and enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment where ambient temperatures exceed standard industrial limits. The device includes internal overtemperature protection that activates above 150°C junction temperature.
How does the LT3790MPFE#TRPBF handle transitions between buck, boost, and buck-boost modes?
The LT3790MPFE#TRPBF uses a proprietary current-mode control architecture with seamless region transition logic. As VIN approaches VOUT, it automatically enters the buck-boost region without discontinuity or mode-switching artifacts. The controller maintains continuous regulation of both voltage and current throughout all regions using shared VC loop control and synchronized gate timing-verified in typical application waveforms (Figures 3–6 of the datasheet).
Can the LT3790MPFE#TRPBF regulate both input and output current simultaneously?
No-the LT3790MPFE#TRPBF implements priority-based regulation: the highest active loop (voltage, output current, or input current) takes precedence. If both output current (via ISP/ISN) and input current (via IVINP/IVINN) thresholds are exceeded, the loop generating the higher VC voltage dominates. This prevents conflicting control actions while enabling flexible protection schemes-for example, limiting input current during cold cranking while maintaining output voltage regulation.
What is the purpose of the TEST1 pin on the LT3790MPFE#TRPBF?
Pin 29 (TEST1) is a factory test function pin and must be connected to SGND for normal operation of the LT3790MPFE#TRPBF. Leaving TEST1 floating or unconnected will prevent the device from functioning. This requirement is explicitly stated in the Pin Functions section of the datasheet and applies to all LT3790 variants including the MP-grade LT3790MPFE#TRPBF.
Does the LT3790MPFE#TRPBF support parallel operation, and how is it implemented?
Yes-the LT3790MPFE#TRPBF supports coherent parallel operation via its dedicated CLKOUT and SYNC pins. CLKOUT delivers a 180° phase-shifted copy of the internal oscillator, allowing two devices to interleave naturally. Alternatively, an external clock applied to SYNC synchronizes multiple LT3790MPFE#TRPBF controllers at the same frequency and defined phase offset-enabling scalable output power beyond 100W with reduced input/output ripple.
LT3790MPFE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3790MPFE#TRPBF FAQ
1.How can I place an order for LT3790MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3790MPFE#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 LT3790MPFE#TRPBF reliable?
The price and inventory of LT3790MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3790MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3790MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3790MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3790MPFE#TRPBF?
LT3790MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3790MPFE#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 LT3790MPFE#TRPBF?
For technical support, including LT3790MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3790MPFE#TRPBF requirements.
6.How does Aetrix verify that LT3790MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3790MPFE#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 LT3790MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3790MPFE#TRPBF?
All LT3790MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3790MPFE#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 LT3790MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3790MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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