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Analog Devices Inc. LTC3890EGN-1#TRPBF
- Part No.:
- LTC3890EGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890EGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,685
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Product details
Overview
LTC3890EGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages for high-efficiency 8.5V/3.3V outputs. It operates from 4V to 60V input, delivers ≤24V programmable output voltage per channel, supports RSENSE or DCR current sensing, and achieves 50µA quiescent current in single-channel sleep mode - ideal for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890EGN-1#TRPBF datasheet, LTC3890EGN-1#TRPBF pinout, LTC3890EGN-1#TRPBF application, or LTC3890EGN-1#TRPBF equivalent, key selection criteria include its out-of-phase dual-channel architecture (reducing input capacitance and supply noise), phase-lockable 75kHz–850kHz switching frequency, selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous), and integrated 5.1V INTVCC LDO with EXTVCC switchover capability.
Technical Context
The LTC3890EGN-1#TRPBF implements a constant-frequency current-mode control architecture with two independent controllers operating 180° out-of-phase to minimize input ripple and EMI. Each channel features dedicated error amplifiers (ITH1/ITH2), differential current sense inputs (SENSE1±/SENSE2±), and independent TRACK/SS pins enabling soft-start or voltage tracking.
Its OPTI-LOOP® compensation supports wide output capacitor ESR ranges, while the internal 5.1V LDO powers gate drivers from VIN or EXTVCC (switchover at 4.7V). The device includes robust protection: output overvoltage detection (±10% VFB trip), power-good monitoring (PGOOD1), and no current foldback during start-up - ensuring stable operation under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V industrial buses and wide battery chemistries (e.g., 12S Li-ion). |
| IQ (One Channel On) | 50µA - extends runtime in always-on battery systems (e.g., telematics, ADAS sensors). |
| VOUT Range | 0.8V to 24V per channel - enables flexible dual-rail generation (e.g., 3.3V + 8.5V for FPGA I/O and core logic). |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation (e.g., 12V→11.5V conversion with minimal loss). |
| Current Sensing | RSENSE or DCR - eliminates sense resistor losses in high-current applications (≥5A per channel). |
| Package | 28-Lead SSOP - surface-mount compatible with standard reflow profiles; thermal resistance θJA = 90°C/W. |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), RoHS-compliant, –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / current limit control | Directly sets peak inductor current per channel; used for loop compensation and current foldback. |
| VFB1, VFB2 | Feedback input | Monitors output voltage via external resistor divider; regulated to 0.800V ±1.2% over temperature. |
| SENSE1+, SENSE2+ | Current sense positive input | Connects to high-side of sense resistor or DCR network; differential measurement rejects common-mode noise. |
| SENSE1–, SENSE2– | Current sense negative input | Completes differential sense path; bias current <±1µA minimizes offset error in precision sensing. |
| PLLIN/MODE | Light-load mode select / sync input | Configures Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC); accepts external clock for synchronization. |
| RUN1, RUN2 | Channel enable control | Digital shutdown pins: <1.15V disables individual channel; both <0.7V reduces total IQ to 14µA. |
| TG1, TG2 / BG1, BG2 | Top/bottom gate drivers | Drives N-MOSFET gates with 2.5Ω pull-up / 1.5Ω pull-down; supports >1MHz switching with 25ns transition times. |
| PGOOD1 | Power-good indicator | Open-drain output asserts low when VFB1 deviates >±10% from regulation - enables system sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces RMS input current by ~30%, cutting required bulk capacitance and lowering conducted EMI. |
| OPTI-LOOP® compensation | Enables stable loop response across 10× variation in output capacitor ESR without external component changes. |
| Adjustable soft-start/tracking | Internal 1µA current source charges external capacitor on TRACK/SS pins - ensures monotonic, controlled ramp-up of both outputs. |
| EXTVCC switchover | Automatically switches INTVCC power source from VIN LDO to higher-efficiency EXTVCC LDO above 4.7V - improves overall system efficiency. |
| No current foldback at startup | Prevents premature current limiting during inrush - guarantees full output voltage regulation even with large output capacitors. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC Dual-Rail Converter |
|---|---|
|
Use Scenario: Powering display controller (3.3V) and audio codec (8.5V) from 12V vehicle battery with cold-crank tolerance down to 4V. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller managing independent voltage rails with out-of-phase switching to suppress EMI in sensitive RF zones. Use Value: 50µA quiescent current prevents battery drain during vehicle sleep mode; 60V absolute max input withstands load-dump transients. |
Use Scenario: Generating isolated 3.3V logic and 8.5V analog rails for sensor interface and microcontroller in factory automation equipment. IC Role / Device Role / Timing Role: High-voltage dual buck controller delivering tightly regulated outputs with independent soft-start and tracking for safe system boot-up. Use Value: RSENSE/DCR flexibility accommodates high-current analog supplies; PGOOD1 enables coordinated power sequencing with downstream FPGAs. |
| Battery-Powered Test Equipment | Distributed Telecom DC System |
|
Use Scenario: Portable oscilloscope requiring low-noise 3.3V digital rail and low-ripple 8.5V analog supply from 24V LiFePO₄ pack. IC Role / Device Role / Timing Role: Dual-phase controller operating in forced continuous mode to eliminate light-load ripple in analog signal paths. Use Value: Phase-locked frequency synchronization eliminates beat frequencies between converters; 99% duty cycle supports 24V→23.5V conversion during deep discharge. |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying 3.3V control plane and 8.5V optical module rails. IC Role / Device Role / Timing Role: High-efficiency dual buck controller with EXTVCC support - powered from one output to drive the other, improving overall efficiency. Use Value: 75kHz–850kHz programmability enables optimal trade-off between size (high-freq) and efficiency (low-freq) per rail; thermal derating validated to 125°C junction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3890IGN-1#TRPBF | Same die, extended –40°C to 125°C grade with tighter initial VFB tolerance (±0.75% vs ±1.0%) | Required for industrial environments with wider ambient temperature swings | Select when guaranteed performance over full –40°C to 125°C range is mandatory; otherwise LTC3890EGN-1#TRPBF suffices for commercial-grade designs. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only (no external FET support); fixed 600kHz frequency; no EXTVCC option | Suitable for space-constrained, medium-power (<15W/channel) applications where integration outweighs flexibility | Choose MP2918GL-Z only if board area is critical and 4V–36V input range (vs 4V–60V) is acceptable; LTC3890EGN-1#TRPBF retains superior HV robustness and configurability. |
Compared with LTC3890IGN-1#TRPBF, the LTC3890EGN-1#TRPBF trades guaranteed high-temp performance for lower cost and adequate stability in commercial environments; versus MP2918GL-Z, it offers wider input range, external FET control, and EXTVCC flexibility - essential for high-reliability or high-voltage industrial designs.
Availability
LTC3890EGN-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power supplies, and battery-operated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3890EGN-1#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, inheriting its legacy of high-performance analog and power management ICs with emphasis on precision, reliability, and rugged operation.
The LTC3890-1 product line was designed for high-input-voltage, dual-rail DC/DC conversion in automotive, industrial, and telecom applications demanding ultra-low quiescent current, wide VIN range, and robust fault protection.
FAQ
What is the maximum input voltage rating for the LTC3890EGN-1#TRPBF?
The LTC3890EGN-1#TRPBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 4V to 60V. This 60V upper limit ensures reliable operation across 12V, 24V, and 48V industrial and automotive bus systems, including transient tolerance during load dump events. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
How does the LTC3890EGN-1#TRPBF achieve 50µA quiescent current?
The LTC3890EGN-1#TRPBF achieves 50µA quiescent current by entering Sleep Mode when only one channel is active and light-load conditions trigger the PLLIN/MODE pin configuration. In this state, internal circuitry-including error amplifiers and oscillators-is selectively disabled while maintaining regulation, minimizing power draw from the input source. This behavior is confirmed in the Electrical Characteristics table under "Sleep Mode (One Channel On)".
Can the LTC3890EGN-1#TRPBF synchronize to an external clock?
Yes, the LTC3890EGN-1#TRPBF can synchronize to an external clock via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop forces the rising edge of TG1 to align with the external clock's rising edge - enabling deterministic timing across multiple converters and reducing beat-frequency EMI. This capability is explicitly documented in the Pin Functions and Electrical Characteristics sections.
What protection features does the LTC3890EGN-1#TRPBF include?
The LTC3890EGN-1#TRPBF includes output overvoltage protection (trip at ±10% VFB), power-good monitoring (PGOOD1 open-drain output), undervoltage lockout (UVLO at 3.6V–4.0V), and reverse-current prevention via IR comparator. It also features no current foldback during start-up - preventing premature current limiting - and 99% duty cycle operation for ultra-low dropout. All protections are verified in the Absolute Maximum Ratings and Electrical Characteristics tables.
Is the LTC3890EGN-1#TRPBF pin-compatible with other variants in the LTC3890 family?
Yes, the LTC3890EGN-1#TRPBF is pin-compatible with all GN-package variants of the LTC3890-1 family, including LTC3890IGN-1#TRPBF and LTC3890HGN-1#TRPBF. They share identical 28-lead SSOP footprints, pin assignments, and electrical interfaces - differing only in temperature grade, initial VFB tolerance, and guaranteed operating range. This allows drop-in replacement for qualification upgrades without PCB redesign.
LTC3890EGN-1#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
- Output Configuration:
- Positive
- Topology:
- Buck
- 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-1#TRPBF FAQ
1.How can I place an order for LTC3890EGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890EGN-1#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-1#TRPBF reliable?
The price and inventory of LTC3890EGN-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890EGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890EGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890EGN-1#TRPBF?
LTC3890EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890EGN-1#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-1#TRPBF?
For technical support, including LTC3890EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890EGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3890EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890EGN-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890EGN-1#TRPBF?
All LTC3890EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890EGN-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890EGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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