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Analog Devices Inc. LTC3789IGN#TRPBF
- Part No.:
- LTC3789IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3789IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
LTC3789IGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous 4-switch buck-boost controller IC designed for single-inductor DC/DC conversion where input voltage may be above, below, or equal to output voltage. It delivers ±1% output voltage accuracy over 0.8V–38V range, supports up to 600kHz phase-lockable switching frequency, and integrates quad N-channel MOSFET gate drivers for automotive power systems and battery-powered telecom equipment.
For engineers reviewing the LTC3789IGN#TRPBF datasheet, LTC3789IGN#TRPBF pinout, LTC3789IGN#TRPBF application, or LTC3789IGN#TRPBF equivalent, key selection criteria include its seamless buck-boost transition, programmable input/output current limiting, true soft-start with VOUT short protection in boost mode, and dual-mode operation (pulse-skipping vs forced continuous) via MODE/PLLIN pin.
Technical Context
The LTC3789IGN#TRPBF implements a constant-frequency current-mode control architecture with independent valley-current sensing in buck region and peak-current sensing in boost region. Its proprietary four-switch topology enables continuous conduction across VIN/VOUT crossover without discontinuity or audible noise.
It features dual feedback loops: one for output voltage regulation (via VFB/ITH error amplifier) and another for input or output average current regulation (via IOSENSE+/IOSENSE–). The internal 5.5V LDO powers control circuitry, while EXTVCC support allows efficient self-biasing from regulated output to reduce thermal load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports wide automotive battery transients (cold crank to load dump) and industrial DC bus inputs. |
| Output Voltage Accuracy | ±1% at 0.8V–38V - ensures stable regulation for precision analog rails and microcontroller cores. |
| Switching Frequency | 200kHz–600kHz (phase-lockable) - enables EMI-controlled layout and compact magnetics design. |
| Efficiency | Up to 98% - achieved via synchronous rectification and low RDS(on) gate drive capability (2.6Ω pull-up / 1.5Ω pull-down). |
| Current Sensing | Programmable input/output average current limit (48–160mV threshold) - enables battery charge current control or input current foldback. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial embedded environments. |
| Package | 28-lead QFN (4mm × 5mm) - thermally enhanced with exposed SGND pad (θJA = 34°C/W) for high-power density designs. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN with exposed SGND pad (Pin 29), rated for –40°C to +125°C operating junction temperature.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 26) | Error amplifier feedback input | Compares resistive divider output against 0.8V reference; sets final regulated VOUT with ±1% accuracy. |
| SS (Pin 27) | Soft-start ramp control | Internal 3µA current charges external capacitor; linearly ramps VFB setpoint from 0V to 0.8V for controlled VOUT rise. |
| SENSE+ / SENSE– (Pins 28, 1) | Valley/peak current sense differential inputs | Measure inductor current via external shunt; enable cycle-by-cycle current limiting in buck (valley) or boost (peak) modes. |
| MODE/PLLIN (Pin 4) | Mode selection / external sync input | Tie to SGND for forced continuous mode (fixed frequency); tie to INTVCC for pulse-skipping (high efficiency at light load); accept external clock for synchronization. |
| TG1/TG2 (Pins 23, 14) | Top N-MOSFET gate drivers | Floating outputs with INTVCC–0.5V swing referenced to SW1/SW2; drive high-side switches in buck and boost legs. |
| BG1/BG2 (Pins 20, 16) | Bottom N-MOSFET gate drivers | Ground-referenced outputs (0V to INTVCC); control synchronous rectifiers for >95% efficiency in all regions. |
| PGOOD (Pin 25) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from target; includes 20µs debounce to reject transient faults. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck and boost converters; reduces BOM count and PCB area in multi-rail power systems. |
| True soft-start with VOUT short protection | Prevents inrush current during startup and maintains safe operation even if output is shorted in boost mode. |
| No reverse current during startup | Ensures clean power sequencing in battery backup systems and prevents backfeeding into source during cold start. |
| VOUT disconnected from VIN during shutdown | Provides complete isolation between input and output when disabled - critical for system-level safety and leakage control. |
| Internal 5.5V LDO with EXTVCC switchover | Reduces IC self-heating by allowing bias from regulated output rail; improves thermal performance in high-input-voltage applications. |
Applications
| Automotive Infotainment Power Supply | Telecom Distributed DC Bus |
|---|---|
|
Use Scenario: Powering 12V display modules and audio amplifiers from a 9V–16V vehicle battery with load dump immunity. IC Role / Device Role / Timing Role: 4-switch buck-boost controller regulating stable 12V output regardless of engine cranking (5.5V) or alternator surge (36V). Use Value: Seamless VIN/VOUT crossover eliminates output dropout during cold-crank events; PGOOD enables system reset coordination. |
Use Scenario: Generating isolated 48V intermediate bus from 24V or 60V telecom rack supplies. IC Role / Device Role / Timing Role: High-efficiency synchronous controller driving discrete N-MOSFETs to deliver >10A at 48V with <200kHz EMI signature. Use Value: Phase-lockable frequency allows synchronization to system clock; programmable current limit protects upstream rectifiers during fault conditions. |
| High-Power Portable Medical Device | Industrial PLC I/O Module |
|
Use Scenario: Battery-powered ultrasound scanner requiring 3.3V, 5V, and ±15V rails from 10.8V Li-ion pack. IC Role / Device Role / Timing Role: Primary buck-boost stage generating regulated 12V intermediate rail feeding downstream point-of-load converters. Use Value: Pulse-skipping mode extends runtime at standby; true soft-start prevents sensor bias disruption during power-on. |
Use Scenario: DIN-rail mounted controller powering 24V fieldbus interfaces and 5V logic from unregulated 18V–32V industrial supply. IC Role / Device Role / Timing Role: Robust DC/DC controller maintaining regulation during brownouts and line transients per IEC 61000-4-11. Use Value: Wide 4V–38V input range accommodates aging power supplies; 125°C rating ensures reliability in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EUFD#TRPBF | Lower max frequency (400kHz), no EXTVCC support, same QFN package and pinout. | Not suitable for high-frequency EMI-sensitive designs or self-biased thermal optimization. | Select when cost sensitivity outweighs frequency headroom and thermal margin requirements. |
| MPQ4333GL-AEC1 | Integrated MOSFETs (40V/5A), fixed 500kHz frequency, AEC-Q100 Grade 1, no IOSENSE pins. | Lacks programmable input/output current regulation and external sync capability. | Choose for space-constrained automotive applications where integrated FETs simplify layout but flexibility is secondary. |
Compared with LTC3780EUFD#TRPBF and MPQ4333GL-AEC1, the LTC3789IGN#TRPBF offers superior frequency agility (200–600kHz), dual current-sense capability (ILIM + IOSENSE), and EXTVCC thermal management - making it optimal for high-performance, thermally constrained, or multi-rail industrial designs.
Availability
LTC3789IGN#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, telecom distributed power architectures, and high-power portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3789IGN#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3789 belongs to Linear's high-performance power controller family, engineered specifically for seamless buck-boost conversion in automotive, industrial, and telecom applications demanding wide input range and robust transient response.
FAQ
What is the maximum supported switching frequency for the LTC3789IGN#TRPBF?
The LTC3789IGN#TRPBF supports a phase-lockable fixed-frequency range of 200kHz to 600kHz. At VFREQ = 2.4V, typical nominal frequency is 640kHz (max 710kHz), enabling high-density magnetics design while maintaining EMI compliance through synchronization capability.
Does the LTC3789IGN#TRPBF support battery charging applications?
Yes, the LTC3789IGN#TRPBF supports battery charging via its programmable input/output current feedback loop. The IOSENSE+/IOSENSE– pins enable precise average current regulation, and ILIM pin configuration allows setting charge current thresholds from 48mV to 160mV across temperature.
How does the LTC3789IGN#TRPBF handle transitions between buck, buck-boost, and boost modes?
The LTC3789IGN#TRPBF uses internal buck-boost transition comparators (VINSNS/VOUTSNS) to detect VIN/VOUT relationship and automatically reconfigure switch timing. Transitions are seamless with no output glitch or discontinuity, verified in typical performance curves (Figures G01–G03).
What is the purpose of the EXTVCC pin on the LTC3789IGN#TRPBF?
The EXTVCC pin on the LTC3789IGN#TRPBF accepts an external 4.8V–14V supply to power the internal 5.5V LDO, bypassing the VIN-derived regulator. This reduces IC power dissipation and improves thermal performance - especially useful when biasing from the regulated output rail.
Can the LTC3789IGN#TRPBF operate with only two external MOSFETs?
No - the LTC3789IGN#TRPBF requires four external N-channel MOSFETs (two high-side, two low-side) to implement its 4-switch buck-boost topology. It provides dedicated TG1/BG1 and TG2/BG2 gate drivers with matched timing and bootstrap support for both legs.
LTC3789IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 38V
- Frequency - Switching:
- 200kHz ~ 640kHz
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3789IGN#TRPBF FAQ
1.How can I place an order for LTC3789IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3789IGN#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 LTC3789IGN#TRPBF reliable?
The price and inventory of LTC3789IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3789IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3789IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3789IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3789IGN#TRPBF?
LTC3789IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3789IGN#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 LTC3789IGN#TRPBF?
For technical support, including LTC3789IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3789IGN#TRPBF requirements.
6.How does Aetrix verify that LTC3789IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3789IGN#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 LTC3789IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3789IGN#TRPBF?
All LTC3789IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3789IGN#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 LTC3789IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3789IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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