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Analog Devices Inc. LTC3890EGN-3#TRPBF
- Part No.:
- LTC3890EGN-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890EGN-3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
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Product details
Overview
LTC3890EGN-3#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, dual-channel, 2-phase synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It supports 4V–60V input, delivers two independent outputs (e.g., 3.3V/5A and 8.5V/3A), operates with 50µA quiescent current in single-channel sleep mode, and features out-of-phase operation to reduce input ripple-ideal for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890EGN-3#TRPBF datasheet, LTC3890EGN-3#TRPBF pinout, LTC3890EGN-3#TRPBF application, or LTC3890EGN-3#TRPBF equivalent, key selection criteria include its 60V max input rating, dual independent TRACK/SS pins for soft-start/tracking, phase-lockable 75kHz–850kHz frequency range, and support for RSENSE or DCR current sensing in harsh industrial and automotive environments.
Technical Context
The LTC3890EGN-3#TRPBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize input capacitor stress and power supply noise. Each channel uses an error amplifier (EA) comparing VFB to a 0.800V reference, with ITH voltage setting peak inductor current trip point via differential SENSE+/- inputs.
It integrates dual gate drivers (TG/BG) with 2.5Ω pull-up and 1.5Ω pull-down on TG, 2.4Ω/1.1Ω on BG, and internal LDOs powering INTVCC from VIN or EXTVCC (switchover at 4.7V). The PLLIN/MODE pin selects light-load operation modes-Burst Mode®, pulse-skipping, or forced continuous-while FREQ sets switching frequency from 50kHz to 900kHz via external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide battery chemistries (12V/24V/48V systems) and intermediate bus voltages without external pre-regulation. |
| IQ (Sleep, 1 ch) | 50µA - extends runtime in always-on battery applications such as telematics or infotainment standby. |
| VOUT Range | 0.8V to 24V - enables flexible dual-output configurations including 3.3V, 5V, 8.5V, and 12V rails from single controller. |
| fSW Range | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and inductor size reduction while maintaining synchronization with system clocks. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation essential for high-VIN-to-low-VOUT conversion (e.g., 60V→3.3V). |
| Current Sensing | RSENSE or DCR - eliminates need for dedicated sense resistors in high-current designs, reducing power loss and board space. |
| PGOOD Output | Open-drain PGOOD1 - provides system-level power-good monitoring for only Channel 1 (per LTC3890-3 family spec). |
Pinout & Package
Package: 28-lead plastic SSOP (GN), RoHS-compliant, rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / compensation node | Sets peak inductor current trip point per channel; connects to RC network for OPTI-LOOP® compensation. |
| VFB1, VFB2 | Feedback input | Monitors regulated output via external resistor divider; referenced to precise 0.800V internal bandgap. |
| SENSE1+, SENSE2+ | Current sense positive input | Connects to high-side of RSENSE or DCR network; differential pair with SENSE– enables accurate current limiting. |
| SENSE1–, SENSE2– | Current sense negative input | Common-mode range supports ground-referenced sensing; bias current <±1µA minimizes measurement error. |
| PLLIN/MODE | Mode selection & sync input | Selects Burst Mode®/pulse-skipping/forced continuous; accepts external clock up to 850kHz for system-wide timing alignment. |
| RUN1, RUN2 | Independent enable control | Digital shutdown pins with hysteresis; pulling RUN1 & RUN2 <0.7V reduces total IQ to <14µA for full device disable. |
| TG1, TG2 / BG1, BG2 | Top/bottom gate drivers | Drive N-MOSFETs with 25ns transition times; TG swing = SW + (INTVCC – 0.5V), BG swing = 0V to INTVCC. |
| TRACK/SS1, TRACK/SS2 | Soft-start & tracking input | Internal 1µA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider for supply tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual control | Reduces RMS input ripple by ~30% vs. in-phase operation-enables smaller, lower-cost input capacitors. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitance (10µF–1000µF) and ESR values without redesign. |
| Low-IQ sleep mode | 50µA (one channel active) extends battery life in IoT sensors and automotive body electronics requiring long-term wakefulness. |
| Dropout recovery circuit | Forces periodic top-FET off-time during 99% duty cycle to recharge bootstrap capacitors-ensures reliable high-VIN-to-low-VOUT operation. |
| Independent TRACK/SS pins | Enables staggered start-up or precise voltage tracking between outputs-critical for FPGA/CPU core-and-I/O rail sequencing. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for display processor (3.3V) and audio codec (8.5V) in vehicle head unit with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary dual-phase buck controller managing load transients during ignition pulses and CAN bus activity. Use Value: 60V input rating survives 65V load dump; 50µA sleep IQ maintains RTC and wake-on-RF functionality during vehicle sleep. |
Use Scenario: Distributed 24V-to-5V/3.3V conversion for analog input conditioning and microcontroller supply in modular PLC backplane. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC controller delivering isolated, sequenced rails for mixed-signal signal chain integrity. Use Value: Out-of-phase operation suppresses conducted EMI into sensitive ADC references; RSENSE/DCR flexibility accommodates legacy PCB layouts. |
| Battery-Powered Test Equipment | Distributed Telecom Power |
Use Scenario: Portable oscilloscope with Li-ion (8.4V–12.6V) input powering 3.3V FPGA logic and 8.5V analog front-end amplifiers. IC Role / Device Role / Timing Role: Dual-output step-down controller enabling compact, thermally efficient power architecture with minimal external components. Use Value: 99% duty cycle supports deep discharge operation down to 3.3V output from 8.4V battery; Burst Mode® sustains >85% efficiency at 1mA load. |
Use Scenario: 48V intermediate bus conversion to 3.3V/5V rails for remote radio units in 5G small cell base stations. IC Role / Device Role / Timing Role: High-voltage, high-reliability controller synchronized to system clock via PLLIN/MODE for deterministic EMI profile. Use Value: Phase-lockable 75kHz–850kHz range avoids critical RF bands; 125°C-rated SSOP package ensures operation in sealed outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EGN-3#TRPBF | Includes CLKOUT and PHASMD pins for PolyPhase® operation; adds ILIM pin for adjustable current limit threshold. | Required for multi-phase interleaving beyond 2-phase or when independent overcurrent protection per channel is needed. | Choose LTC3891EGN-3#TRPBF if scaling to 3+ phases or requiring programmable current foldback during overload. |
| MP2918GL-Z | Single-chip dual-output controller with integrated MOSFET drivers but no phase-lock capability; max VIN = 36V. | Lacks 60V input rating and external clock sync-unsuitable for automotive load dump or telecom 48V bus applications. | Consider MP2918GL-Z only for cost-sensitive, lower-input-voltage (<36V) industrial applications where sync is unnecessary. |
Compared with LTC3890EGN-3#TRPBF, the LTC3891EGN-3#TRPBF adds PolyPhase® scalability and adjustable current limit, while the MP2918GL-Z trades voltage rating and synchronization for integration and lower BOM count-making LTC3890EGN-3#TRPBF optimal for rugged, high-VIN, synchronized dual-rail designs.
Availability
LTC3890EGN-3#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, battery-powered test equipment, and distributed telecom power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3890EGN-3#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LTC3890 family was designed specifically for high-reliability, wide-input-voltage dual-output DC/DC control in automotive, industrial, and telecom infrastructure-emphasizing low quiescent current, robust fault handling, and flexible sequencing.
FAQ
What is the maximum input voltage rating for the LTC3890EGN-3#TRPBF?
The LTC3890EGN-3#TRPBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 4V to 60V. This 60V upper limit ensures reliable operation under automotive load-dump conditions and 48V telecom bus transients while maintaining specified performance across temperature.
Does the LTC3890EGN-3#TRPBF support independent power-good signaling for both channels?
No. The LTC3890EGN-3#TRPBF provides only one open-drain PGOOD1 output, tied to Channel 1's feedback regulation. Unlike the LTC3890-1 or LTC3890-2 variants, it does not include a second PGOOD2 pin-system designers must implement discrete monitoring or sequencing logic for Channel 2's output.
How does the LTC3890EGN-3#TRPBF achieve 99% duty cycle operation?
The LTC3890EGN-3#TRPBF achieves 99% duty cycle via a dropout detection circuit that forces periodic top-FET off-time during sustained high-duty-cycle operation. This allows bootstrap capacitors to recharge even when VIN is close to VOUT, ensuring gate drive integrity without external charge-pump circuitry.
Can the LTC3890EGN-3#TRPBF synchronize to an external clock source?
Yes. The PLLIN/MODE pin accepts an external clock signal (75kHz–850kHz) to phase-lock the rising edge of TG1 to the external clock's rising edge. This enables deterministic EMI placement and system-level timing coordination-critical in noise-sensitive applications like medical imaging or radar subsystems.
What is the purpose of the EXTVCC pin on the LTC3890EGN-3#TRPBF?
The EXTVCC pin on the LTC3890EGN-3#TRPBF allows the internal INTVCC LDO to be powered from an external 4.7V–14V supply instead of VIN. This improves efficiency by bypassing the VIN-based LDO-especially useful when powering INTVCC from one of the LTC3890EGN-3#TRPBF's own regulated outputs (e.g., 5V or 8.5V rail).
LTC3890EGN-3#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-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 105kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3890EGN-3#TRPBF FAQ
1.How can I place an order for LTC3890EGN-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890EGN-3#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 LTC3890EGN-3#TRPBF reliable?
The price and inventory of LTC3890EGN-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890EGN-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890EGN-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890EGN-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890EGN-3#TRPBF?
LTC3890EGN-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890EGN-3#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 LTC3890EGN-3#TRPBF?
For technical support, including LTC3890EGN-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890EGN-3#TRPBF requirements.
6.How does Aetrix verify that LTC3890EGN-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890EGN-3#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 LTC3890EGN-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890EGN-3#TRPBF?
All LTC3890EGN-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890EGN-3#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 LTC3890EGN-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890EGN-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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