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Analog Devices Inc. LTC3789EGN#TRPBF
- Part No.:
- LTC3789EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3789EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,569
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Product details
Overview
LTC3789EGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance, synchronous 4-switch buck-boost DC/DC controller IC designed for single-inductor voltage regulation where input may be above, below, or equal to output. It delivers up to 98% efficiency, supports 4V–38V input/output range, features ±1% output voltage accuracy over 0.8V–38V, and enables seamless low-noise transitions between buck, buck-boost, and boost operating regions - ideal for automotive infotainment power supplies.
For engineers reviewing the LTC3789EGN#TRPBF datasheet, LTC3789EGN#TRPBF pinout, LTC3789EGN#TRPBF application, or LTC3789EGN#TRPBF equivalent, key selection criteria include its programmable input/output current sensing, phase-lockable 200kHz–600kHz switching frequency, true soft-start with VOUT short protection in boost mode, and dual-package availability (28-pin SSOP and QFN).
Technical Context
The LTC3789EGN#TRPBF implements a constant-frequency current-mode control architecture with independent valley-current sensing in buck mode and peak-current sensing in boost mode. Its proprietary 4-switch topology uses quad N-channel MOSFET drivers (TG1/BG1/TG2/BG2) and internal charge pumps to sustain top-side gate drive during extended duty cycles.
Operating mode is selected via the MODE/PLLIN pin: forced continuous conduction (FCM) for EMI-sensitive systems or pulse-skipping (DCM) for light-load efficiency. An integrated 5.5V LDO powers internal circuitry from VIN or EXTVCC, and PGOOD monitors VFB within ±10% of setpoint after a 20µs mask timer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 4V to 38V - supports wide automotive battery transients and industrial bus voltages without external pre-regulation. |
| Output Voltage Accuracy | ±1% over 0.8V–38V - ensures stable reference for precision analog or microcontroller supply rails. |
| Switching Frequency | 200kHz–600kHz, phase-lockable - enables EMI filtering optimization and synchronization with system clocks. |
| Efficiency | Up to 98% - reduces thermal load in enclosed enclosures and extends battery runtime in portable systems. |
| Current Sensing | Programmable input/output average current limit via ILIM pin - allows configurable overcurrent protection for battery charging or load management. |
| Package | 28-lead narrow SSOP (GN) - provides proven thermal performance (θJA = 80°C/W) and compatibility with legacy PCB layouts. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
Package: 28-lead narrow plastic SSOP (GN), 4mm × 5.5mm body, exposed pad not present. Thermal resistance θJA = 80°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VFB (1) | Error amplifier feedback input | Connects to resistor divider on VOUT; regulates output to 0.8V reference with ±1% accuracy. |
| SS (2) | Soft-start ramp control | Internal 3µA current charges external capacitor; controls monotonic VOUT rise time during startup. |
| SENSE+ (3) | Current sense comparator (+) input | Measures voltage across RSENSE; sets valley/peak current trip threshold proportional to ITH voltage. |
| SENSE– (4) | Current sense comparator (–) input | Return path for current-sense resistor; must connect directly to PGND for accurate sensing. |
| ITH (5) | Error amplifier output / compensation node | Controls current limit threshold; used for loop compensation with external RC network. |
| SGND (6) | Small-signal ground reference | Must be routed separately from PGND to avoid noise coupling into error amplifier and current sense paths. |
| MODE/PLLIN (7) | Mode select / external clock sync input | Tied to SGND → forced continuous mode; tied to INTVCC → pulse-skipping; driven externally → PLL synchronization. |
| FREQ (8) | Oscillator frequency programming | 10µA sink current; resistor to ground sets nominal frequency from 200kHz to 600kHz. |
| RUN (9) | Enable/disable control | Pulled low (<0.5V) disables IC; rising edge >1.22V initiates startup sequence with hysteresis. |
| VINSNS (10) | VIN sense for buck-boost transition | Monitors input-side switch node (SW1) to determine region boundary between buck and buck-boost operation. |
| VOUTSNS (11) | VOUT sense for buck-boost transition | Monitors output-side switch node (SW2) to enable seamless mode transitions without output disturbance. |
| ILIM (12) | Average current limit configuration | SGND/INTVCC/floating selects max average current sense threshold (48/90/130 mV) for input or output current regulation. |
| IOSENSE+ (13) | Input/output average current sense (+) | Used with IOSENSE– to monitor average inductor current for battery charge control or load current limiting. |
| IOSENSE– (14) | Input/output average current sense (–) | Return for average current sense path; connects to RSENSE midpoint or dedicated current-sense resistor. |
| TRIM (15) | Reference trim disable | Must be tied to GND; floating causes undefined behavior and potential regulation failure. |
| PGOOD (28) | Power-good open-drain output | Asserts high-Z when VFB is within ±10% of target for >20µs; used for system power sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck and boost converters, reducing BOM count and board space in multi-rail systems. |
| True soft-start with VOUT short protection | Prevents inrush current and enables safe startup even when output is shorted - critical for field-serviceable equipment. |
| VOUT disconnected from VIN during shutdown | Blocks reverse current flow from output to input, protecting upstream sources and enabling hot-swap capability. |
| No reverse current during startup | Ensures clean power-up in battery-powered systems where backfeeding could damage cells or fuel gauges. |
| Quad N-channel MOSFET synchronous drive | Supports discrete external FETs with optimized gate timing (60ns dead-time), maximizing efficiency and minimizing shoot-through risk. |
Applications
| Automotive Infotainment Power | Distributed Telecom DC Power |
|---|---|
Use Scenario: Powering 12V display modules and audio amplifiers from a 9V–16V vehicle battery with cold-crank (4.5V) and load-dump (38V) transients. IC Role / Device Role / Timing Role: Primary buck-boost controller regulating stable 12V rail; manages seamless transitions during engine start and alternator voltage spikes. Use Value: Maintains uninterrupted operation without brownouts or resets during 4V–38V input excursions, meeting ISO 16750-2 requirements. | Use Scenario: Generating isolated 48V intermediate bus from 36V–72V telecom rectifier output for downstream POL converters. IC Role / Device Role / Timing Role: High-efficiency front-end controller with programmable current limit for system-level overcurrent coordination. Use Value: Delivers >95% efficiency at full load while supporting phase-locking to master clock for coherent ripple cancellation across multiple boards. |
| High-Power Portable Medical Devices | Industrial PLC I/O Power |
Use Scenario: Battery-backed 5V/3.3V rails for ultrasound imaging processors and sensor interfaces in mobile diagnostic equipment. IC Role / Device Role / Timing Role: Dual-output capable controller (with external circuitry) managing both main logic and analog sensor supplies from Li-ion or lead-acid packs. Use Value: Pulse-skipping mode extends runtime at standby; ±1% output accuracy ensures ADC reference stability and signal integrity. | Use Scenario: Providing regulated 24V and 5V outputs for digital I/O modules in factory automation cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust controller operating continuously at –40°C to +125°C junction, with PGOOD signaling for system health monitoring. Use Value: Eliminates need for external UVLO/OVLO circuits; internal 5.5V LDO simplifies biasing of level-shifters and isolation drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EUFD#TRPBF | Same die, 28-lead 4mm × 5mm QFN package with exposed thermal pad (θJA = 34°C/W); identical electrical specs. | Better thermal performance required for high-power density designs; requires different land pattern and reflow profile. | Select when board space is constrained and thermal headroom is limited - no circuit redesign needed. |
| MPQ4333GQ-AEC1 | Monolithic 3.5A buck-boost converter (integrated FETs); fixed 5V/12V outputs; lower max input (36V); no ILIM or IOSENSE pins. | Suitable for cost-sensitive, lower-current applications where discrete FET flexibility is unnecessary. | Choose for simplified design with <3A loads and no requirement for programmable current regulation or external FET optimization. |
Compared with LTC3789EGN#TRPBF, the LTC3789EUFD#TRPBF offers superior thermal dissipation in compact layouts, while the MPQ4333GQ-AEC1 trades configurability for integration and AEC-Q100 qualification - making it viable only where discrete FET control and wide input/output programmability are not required.
Availability
LTC3789EGN#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, distributed telecom DC power systems, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3789EGN#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 all Linear ICs including the LTC3789 series.
The LTC3789 belongs to Linear's high-performance power controller family, engineered specifically for wide-input, single-inductor buck-boost regulation in harsh environments where reliability, efficiency, and seamless mode transitions are critical.
FAQ
What is the maximum input voltage rating for the LTC3789EGN#TRPBF?
The LTC3789EGN#TRPBF has an absolute maximum input supply voltage (VIN) rating of 40V. Its operational input range is specified from 4V to 38V, making it suitable for automotive and industrial applications with wide transient conditions. Exceeding 40V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3789EGN#TRPBF support synchronization to an external clock?
Yes, the LTC3789EGN#TRPBF supports external clock synchronization via the MODE/PLLIN pin. When driven with a clean TTL/CMOS clock signal, the internal PLL locks to frequencies from 200kHz to 600kHz, forcing continuous conduction mode and eliminating beat frequencies in multi-converter systems.
How does the LTC3789EGN#TRPBF handle startup when VOUT is shorted?
The LTC3789EGN#TRPBF incorporates true soft-start with VOUT short protection, even in boost mode. During startup, the controller limits inrush current and actively monitors for output shorts, preventing damage to external FETs or inductors - a feature confirmed in the Applications Information section and typical performance curves.
Can the LTC3789EGN#TRPBF regulate both input and output current?
Yes, the LTC3789EGN#TRPBF supports programmable input or output average current regulation using the ILIM pin and IOSENSE+/IOSENSE– inputs. By configuring ILIM (SGND/INTVCC/floating), designers select one of three current-sense thresholds (48/90/130 mV) to implement battery charge control or load current limiting.
What is the purpose of the TRIM pin on the LTC3789EGN#TRPBF?
The TRIM pin on the LTC3789EGN#TRPBF must be tied to GND for normal operation. It is not a user-adjustable trim function; leaving it floating may cause undefined regulation behavior or failure to start. This requirement is explicitly stated in the Pin Functions section of the official datasheet.
LTC3789EGN#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
LTC3789EGN#TRPBF FAQ
1.How can I place an order for LTC3789EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3789EGN#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 LTC3789EGN#TRPBF reliable?
The price and inventory of LTC3789EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3789EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3789EGN#TRPBF?
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4.How is shipping managed for LTC3789EGN#TRPBF?
LTC3789EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3789EGN#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 LTC3789EGN#TRPBF?
For technical support, including LTC3789EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3789EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3789EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3789EGN#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 LTC3789EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3789EGN#TRPBF?
All LTC3789EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3789EGN#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 LTC3789EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3789EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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