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Analog Devices Inc. LT3790HFE#TRPBF
- Part No.:
- LT3790HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3790HFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,700
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Product details
Overview
LT3790HFE#TRPBF from Analog Devices is a 60V synchronous 4-switch buck-boost controller IC designed for wide-input, wide-output voltage regulation and bidirectional current control in automotive, industrial, and telecom power systems. It supports input voltages from 4.7V to 60V, regulates output voltage (±2% accuracy), output current (±6% accuracy), or input current, and operates at adjustable switching frequencies from 200kHz to 700kHz with seamless mode transitions.
For engineers reviewing the LT3790HFE#TRPBF datasheet, LT3790HFE#TRPBF pinout, LT3790HFE#TRPBF application, or LT3790HFE#TRPBF equivalent, key selection criteria 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, and shorted-output flag functionality.
Technical Context
The LT3790HFE#TRPBF implements a constant-frequency current-mode architecture with independent input and output current sense amplifiers (gm = 2.12 mS and 1650 µS), dual gate drivers (TG1/TG2 pull-up: 2.6 Ω; BG1/BG2 pull-down: 1.2 Ω), and a VC error amplifier that arbitrates between voltage, input current, and output current feedback loops. Its topology enables continuous conduction mode (CCM) or discontinuous conduction mode (DCM) operation via the CCM pin.
It features internal 5V INTVCC regulation (4.8V–5.2V), programmable soft-start (SS pin), external synchronization (SYNC), clock output (CLKOUT) for paralleling, and fault flags including C/10 (5mV threshold) and SHORT (400mV FB threshold). The controller eliminates top-FET refresh cycles in buck/boost modes using charge-sharing bootstrap techniques.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.7V to 60V - supports 12V/24V/48V automotive and industrial rails without pre-regulation |
| Output Voltage Accuracy | ±2% (1.2V ≤ VOUT < 60V) - ensures stable regulation across wide output range |
| Output Current Accuracy | ±6% (0V ≤ VOUT < 60V) - enables precise battery/supercapacitor charging control |
| Switching Frequency | 200kHz to 700kHz - adjustable via RT resistor; allows EMI optimization and inductor size trade-offs |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments |
| Package | 38-lead TSSOP with exposed thermal pad - provides low θJA (28°C/W) for high-power density designs |
| Current Sense Inputs | IVINP/IVINN (50mV threshold), ISP/ISN (60mV default) - enables simultaneous input and output current regulation |
Pinout & Package
LT3790HFE#TRPBF is housed in a 38-lead plastic TSSOP package (FE) with an exposed thermal pad (Pin 39) that must be soldered to SGND for thermal and electrical integrity. The package has θJA = 28°C/W and is rated for operation up to +150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL (1) | Output current sense threshold adjustment | Sets V(ISP-ISN) threshold from 1mV to 60mV linearly; 0V–1.1V range gives full scaling |
| SS (2) | Soft-start control | Charges external capacitor to ramp current limit; requires 100kΩ to VREF for proper startup |
| PWM (3) | External shutdown control | Low signal disables all switching and disconnects VC; internal 90kΩ pull-down |
| C/10 (4) | Charge termination flag | Open-drain output asserts when V(ISP-ISN) < 5mV - used for Li-ion C/10 cutoff |
| SHORT (5) | Output short detection | Asserts when FB < 400mV AND V(ISP-ISN) > 5mV - indicates load short or overcurrent fault |
| VREF (6) | 2.00V reference output | Stable 2V source (±2%) for biasing CTRL, dividers, or external circuits; 200µA drive capability |
| ISMON (7) | Output current monitor | 20× V(ISP-ISN); 1.2V at 60mV sense - enables parallel IC current sharing |
| IVINMON (8) | Input current monitor | 20× V(IVINP-IVINN); 1.0V at 50mV sense - supports input power limiting |
| EN/UVLO (9) | Enable and undervoltage lockout | 1.20V falling threshold with 15mV hysteresis; sub-µA bias above threshold |
| IVINP/IVINN (10/11) | Input current sense inputs | Differential pair for 50mV threshold; 90µA/20µA input bias - connects to input shunt |
| VIN (12) | Main input supply | Accepts 4.7V–60V; powers internal circuitry and bootstrap capacitors via INTVCC regulator |
| INTVCC (13) | Internal 5V regulator output | 4.8V–5.2V regulated supply; requires ≥4.7µF ceramic bypass to PGND |
| TG1/BST1/SW1 (14/15/16) | Buck-side high-side driver chain | TG1 drives M1 top FET; BST1 supplies floating gate drive; SW1 is buck switch node |
| PGND (17,20) | Power ground return | High-current return path for bottom FETs and input/output capacitors |
| BG1/BG2 (18/19) | Buck/boost bottom gate drivers | Drive M2/M3 gates from SGND to INTVCC; 3Ω/1.2Ω pull-up/pull-down resistance |
| SW2/BST2/TG2 (21/22/24) | Boost-side high-side driver chain | TG2 drives M4 top FET; BST2 supplies boost-side floating drive; SW2 is boost switch node |
| ISP/ISN (25/26) | Output current sense inputs | Differential pair for 60mV default threshold; 110µA/20µA input bias - connects to output shunt |
| SNSP/SNSN (27/28) | Current comparator inputs | Compare VC-derived threshold against sensed current; ±0.3V common-mode range |
| TEST1 (29) | Factory test pin | Must be connected to SGND for normal operation; no user function |
| SGND (30,39) | Signal ground reference | Reference for all small-signal pins (FB, CTRL, SS, etc.); connect to PGND at single point |
| PWMOUT (31) | Buffered PWM output | INTVCC-referenced logic-level signal for external load disconnect MOSFET control |
| CCM (32) | Continuous conduction mode select | ≥1.5V forces CCM; ≤0.3V enables DCM - prevents reverse inductor current at light loads |
| CLKOUT (33) | 180° phase-shifted clock output | Enables synchronized paralleling of two LT3790s for >100W output power |
| SYNC (34) | External clock synchronization input | Accepts 200kHz–700kHz external clock; 90kΩ internal pull-down to GND |
| RT (35) | Frequency set resistor | Resistor to GND sets oscillator frequency: 147kΩ = 200kHz, 59kΩ = 400kHz, 29.1kΩ = 700kHz |
| VC (36) | Error amplifier output and current threshold | 0.7V–1.9V control voltage; sets current trip point and regulates FB to 1.2V |
| FB (37) | Voltage feedback input | Regulates to 1.20V (±1.5mV) - connects to output divider for constant-voltage operation |
| OVLO (38) | Overvoltage lockout input | Shuts down converter if >3.0V applied; resets soft-start and stops switching |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Enables VIN above, below, or equal to VOUT without separate buck/boost stages or complex control |
| No top-FET refresh cycle | Eliminates unnecessary switching loss in buck/boost modes via internal charge-sharing technique |
| VOUT disconnected from VIN during shutdown | Prevents backfeed through power stage when EN/UVLO is low - critical for system safety |
| Parallel capability with CLKOUT | 180° out-of-phase clock output allows two LT3790s to share load evenly with minimal current imbalance |
| C/10 and SHORT status flags | Dedicated open-drain outputs simplify battery management and fault reporting without external logic |
| Input and output current regulation | Independent IVINP/IVINN and ISP/ISN inputs enable simultaneous input power limiting and output current control |
Applications
| Automotive 12V/48V DC-DC Conversion | Industrial Telecom Power Supply |
|---|---|
Use Scenario: Bidirectional power conversion between 12V starter battery and 48V mild-hybrid rail. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller managing voltage regulation, input current limiting, and C/10 charge termination for LiFePO₄ auxiliary battery. Use Value: Seamless transition across VIN/VOUT crossover enables stable 48V output even as engine cranking drops battery to 6V - avoids brownout-induced system reset. | Use Scenario: High-efficiency 48V-to-3.3V/5V/12V intermediate bus converter in telecom base station power shelf. IC Role / Device Role / Timing Role: Primary controller regulating isolated or non-isolated secondary side with precise input current monitoring for upstream rectifier derating. Use Value: ±2% VOUT accuracy and ±6% IOUT accuracy ensure compliance with ITU-T L.1200 transient response requirements while enabling predictive thermal management. |
| Supercapacitor Backup System | Programmable Lab Power Supply |
Use Scenario: Charging and discharging supercapacitor bank (2.7V–48V) for UPS hold-up in factory automation PLCs. IC Role / Device Role / Timing Role: Dual-loop controller regulating both input current (from 24V rail) and output current (to cap bank) with programmable C/10 termination. Use Value: Independent IVINMON and ISMON outputs allow real-time telemetry of charge/discharge efficiency and state-of-health estimation without additional ADC channels. | Use Scenario: Digitally programmable bench supply delivering 0–30V/0–10A with CV/CC priority and overvoltage protection. IC Role / Device Role / Timing Role: Core analog controller implementing precision voltage loop (FB), current limit loop (ISP/ISN), and OVLO fault shutdown. Use Value: 1.20V FB reference with ±0.015V tolerance and 0.025%/V line regulation enable <0.1% output drift over 4.7V–60V input range - meets Class II lab supply specs. |
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 paralleling | Lower-cost option for commercial-temperature industrial applications without battery charge termination or multi-phase scaling | Select LTC3780EFE#PBF when ambient temperature stays below 105°C and C/10/SHORT telemetry is not required. |
| MPQ4333AGL-AEC1-Z | Monolithic 3.5A 60V buck-boost converter (integrated FETs); fixed 500kHz frequency; no input current sensing or programmable thresholds | Drop-in solution for space-constrained 12V–24V systems requiring <3.5A output without external MOSFET layout complexity | Choose MPQ4333AGL-AEC1-Z for simplified BOM and layout where peak power ≤42W and input current monitoring is unnecessary. |
Compared with LTC3780EFE#PBF and MPQ4333AGL-AEC1-Z, the LT3790HFE#TRPBF uniquely combines automotive-grade 150°C operation, dual current regulation, dedicated charge/fault flags, and CLKOUT-enabled paralleling - making it the only choice for high-reliability, high-power (>100W), and battery-integrated applications.
Availability
LT3790HFE#TRPBF is available at Aetrix Electronics and suitable for automotive power conversion, industrial telecom supplies, and supercapacitor backup systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3790HFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3790 product line delivers robust, high-voltage synchronous buck-boost controllers optimized for demanding power conversion applications where input voltage may vary above or below the output - especially in automotive start-stop, telecom intermediate bus, and energy storage systems.
FAQ
What is the maximum operating junction temperature for the LT3790HFE#TRPBF?
The LT3790HFE#TRPBF is guaranteed to operate over a junction temperature range of –40°C to +150°C, making it suitable for under-hood automotive applications and high-ambient industrial environments. This H-grade qualification exceeds the standard E/I-grade parts (–40°C to +125°C) and is verified per Analog Devices' high-reliability testing protocols. Thermal design must maintain θJA ≤ 28°C/W using the exposed pad.
How does the LT3790HFE#TRPBF handle transitions between buck, boost, and buck-boost modes?
The LT3790HFE#TRPBF uses proprietary control logic to seamlessly transition between buck (VIN > VOUT), boost (VIN < VOUT), and buck-boost (VIN ≈ VOUT) regions without output disturbance or mode-hopping artifacts. Its current-mode architecture dynamically adjusts gate drive timing and duty cycle boundaries - for example, enforcing DMAX(BUCK,TG1) = 92% and DMIN(BOOST,BG2) = 8% - ensuring continuous regulation across the full input-output crossover zone.
Can the LT3790HFE#TRPBF regulate both input current and output current simultaneously?
Yes, the LT3790HFE#TRPBF supports independent regulation of input current (via IVINP/IVINN pins, 50mV threshold) and output current (via ISP/ISN pins, 60mV default threshold) using separate transconductance amplifiers (2.12 mS and 1650 µS respectively). The VC error amplifier arbitrates between these loops and the FB voltage loop, giving priority to whichever demands the lowest output current - enabling true multi-loop protection in battery charging and power-limited systems.
What is the purpose of the CLKOUT pin on the LT3790HFE#TRPBF?
The CLKOUT pin on the LT3790HFE#TRPBF provides a 180° phase-shifted copy of the internal oscillator signal at the same frequency (200kHz–700kHz). This enables precise interleaving of two LT3790HFE#TRPBF-based converters to double output power capacity while reducing input/output ripple current by up to 50%, improving thermal performance and EMI behavior in high-power (>100W) applications.
Does the LT3790HFE#TRPBF require external Schottky diodes for dead-time conduction?
No, the LT3790HFE#TRPBF does not require external Schottky diodes across synchronous switches M2 or M4 for dead-time conduction. Its unique charge-sharing bootstrap technique eliminates top-FET refresh cycles and ensures clean body-diode conduction during dead time. However, adding Schottky diodes can improve peak efficiency by 1%–2% at 500kHz by reducing forward voltage drop - an optional enhancement, not a requirement.
LT3790HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3790HFE#TRPBF FAQ
1.How can I place an order for LT3790HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3790HFE#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 LT3790HFE#TRPBF reliable?
The price and inventory of LT3790HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3790HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3790HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3790HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3790HFE#TRPBF?
LT3790HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3790HFE#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 LT3790HFE#TRPBF?
For technical support, including LT3790HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3790HFE#TRPBF requirements.
6.How does Aetrix verify that LT3790HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3790HFE#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 LT3790HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3790HFE#TRPBF?
All LT3790HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3790HFE#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 LT3790HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3790HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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