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Analog Devices Inc. LTC3890IGN-1#TRPBF
- Part No.:
- LTC3890IGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890IGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,587
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Product details
Overview
LTC3890IGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual, 2-phase synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. 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 LTC3890IGN-1#TRPBF datasheet, LTC3890IGN-1#TRPBF pinout, LTC3890IGN-1#TRPBF application, or LTC3890IGN-1#TRPBF equivalent, key selection criteria include its 60V max input rating, dual-channel phase interleaving, programmable light-load modes (Burst/Pulse-Skipping/Continuous), 0.8V feedback reference, and 28-pin SSOP package with validated thermal performance up to 125°C junction temperature.
Technical Context
The LTC3890IGN-1#TRPBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize input capacitor stress and supply-induced noise. Each channel uses an error amplifier (EA) with OPTI-LOOP® compensation, differential current sensing (RSENSE or DCR), and adjustable soft-start/tracking via dedicated TRACK/SS pins.
Its control logic includes a programmable VCO (50kHz–900kHz), phase-lockable PLL interface (75kHz–850kHz), and selectable light-load operation via the PLLIN/MODE pin. The internal 5.1V INTVCC LDO can be powered from VIN or an external EXTVCC source ≥4.7V, enabling high-efficiency self-biasing from one of its own output rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide battery chemistries (12V/24V/48V systems) and intermediate bus voltages without derating. |
| Quiescent Current (1 ch active) | 50µA - extends runtime in always-on battery applications such as telematics or infotainment standby. |
| Feedback Reference Voltage | 0.800V ±1.2% - enables precise output regulation down to 0.8V with standard resistor dividers. |
| Switching Frequency Range | 75kHz to 850kHz (PLL-sync) or 50kHz to 900kHz (fixed) - allows EMI optimization and inductor size trade-offs. |
| Max Duty Cycle | 99% - supports ultra-low dropout operation (e.g., 12V→11.5V conversion) without requiring external bias. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive environments per AEC-Q100 stress test conditions. |
| Package | 28-Lead Plastic SSOP - surface-mount footprint with verified thermal resistance (θJA = 90°C/W). |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), –40°C to 125°C operating junction temperature, θJA = 90°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / compensation node | Controls peak current limit per channel; voltage sets current comparator trip point. |
| VFB1, VFB2 | Feedback input | Compares output voltage (via resistor divider) to 0.800V reference; determines regulation accuracy. |
| SENSE1+, SENSE1− SENSE2+, SENSE2− | Differential current sense inputs | Supports RSENSE or DCR sensing; enables accurate cycle-by-cycle current limiting and foldback protection. |
| PLLIN/MODE | Light-load mode select / sync input | Selects Burst Mode (GND), Pulse-Skipping (1.2V–INTVCC−1.3V), or Continuous (INTVCC); accepts external clock for synchronization. |
| RUN1, RUN2 | Independent enable inputs | Shut down each channel separately; both pulled <0.7V disables entire IC with <14µA shutdown IQ. |
| TRACK/SS1, TRACK/SS2 | Soft-start and tracking input | Internal 1µA pull-up charges external capacitor for controlled ramp; also accepts external voltage for output tracking. |
| PGOOD1 | Power-good open-drain output | Asserts low when VFB1 deviates >±10% from setpoint-provides system-level power sequencing feedback. |
| TG1, TG2 BG1, BG2 SW1, SW2 BOOST1, BOOST2 | Gate drive outputs and switch nodes | Drives external N-MOSFETs; TG/BG provide complementary high-current switching; BOOST supplies floating top-gate bias. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input current by ~30%, allowing smaller input capacitors and lower EMI in distributed power systems. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of output capacitance (10µF–1000µF) and ESR values without redesign. |
| Programmable light-load modes | Three selectable modes (Burst/Pulse-Skipping/Continuous) optimize efficiency vs. ripple/noise trade-off per application requirement. |
| 0.8V feedback reference | Minimizes resistor divider current loss and improves accuracy at low output voltages (e.g., core logic rails). |
| EXTVCC switchover | Automatically selects most efficient INTVCC source (VIN or external rail ≥4.7V), reducing overall system power loss. |
| Output overvoltage protection | Monitors VFB1/VFB2 and shuts down on >+13% deviation-prevents damage to downstream loads during fault conditions. |
Applications
| Automotive Infotainment Power Supply | Industrial IoT Edge Node |
|---|---|
Use Scenario: Dual-rail power for SoC (1.1V core), DDR memory (1.2V), and display interface (3.3V) in vehicle head units with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary dual-phase buck controller managing 12V battery input to generate stable, sequenced low-voltage rails. Use Value: 60V input rating survives load-dump transients; 50µA IQ preserves battery during parking mode; out-of-phase operation lowers conducted EMI below CISPR-25 limits. | Use Scenario: Battery-backed sensor gateway with LTE modem, MCU, and analog front-end requiring isolated 3.3V and 8.5V rails. IC Role / Device Role / Timing Role: High-efficiency dual-output DC/DC controller enabling long-life operation from Li-ion or supercapacitor sources. Use Value: 50µA sleep IQ extends field deployment interval; programmable Burst Mode maintains >85% efficiency at 100µA load; TRACK/SS enables synchronized startup with host processor. |
| Telecom Remote Radio Unit (RRU) | Medical Portable Diagnostic Device |
Use Scenario: Distributed 48V-to-12V/5V conversion in outdoor base station equipment with strict thermal constraints. IC Role / Device Role / Timing Role: Interleaved dual-phase controller delivering high-current outputs while minimizing thermal hotspots on PCB. Use Value: Phase interleaving cuts input ripple current by half versus single-phase design; 125°C rating ensures reliability in sealed enclosures without forced air cooling. | Use Scenario: Portable ultrasound or glucose monitor requiring quiet, low-noise power for analog signal chain and digital subsystems. IC Role / Device Role / Timing Role: Dual-output controller supplying clean 3.3V for ADC/DAC and 8.5V for op-amp bias rails. Use Value: Selectable Pulse-Skipping mode eliminates low-frequency switching noise that would corrupt sensitive analog measurements; PGOOD1 enables safe system reset sequencing. |
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 |
|---|---|---|---|
| LTC3890EGN-1#TRPBF | Same silicon, commercial-grade (–40°C to 125°C), identical pinout and electrical specs. | Not qualified for extended temperature screening; suitable for non-automotive industrial use. | Select when full automotive qualification is unnecessary and cost sensitivity is higher. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only; no external gate drive flexibility; fixed 0.6V reference. | Lacks RSENSE/DCR sensing choice, no EXTVCC option, and no TRACK/SS-based soft-start. | Choose for space-constrained designs where integration outweighs configurability needs. |
Compared with LTC3890EGN-1#TRPBF, the LTC3890IGN-1#TRPBF offers identical functionality with guaranteed automotive-grade temperature screening; versus MP2918GL-Z, it provides superior design flexibility through external MOSFET control, multiple current-sense options, and precision soft-start/tracking-critical for noise-sensitive or thermally demanding applications.
Availability
LTC3890IGN-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial IoT edge nodes, and telecom remote radio units requiring stable component supply with guaranteed long-term availability and AEC-Q100-compliant sourcing.
Supply support for LTC3890IGN-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 and maintains full product support, datasheet documentation, and application engineering resources for legacy Linear parts including the LTC3890 family.
The LTC3890-1 product line delivers high-voltage, low-IQ dual-phase synchronous buck controllers optimized for automotive always-on systems, battery-operated digital devices, and distributed DC power architectures where efficiency, thermal robustness, and flexible configuration are critical.
FAQ
What is the maximum input voltage rating for the LTC3890IGN-1#TRPBF?
The LTC3890IGN-1#TRPBF has an absolute maximum input voltage rating of 65V, with a recommended operating range of 4V to 60V. This allows reliable operation across 12V, 24V, and 48V battery systems-including automotive cold-crank and load-dump transients-without external clamping circuitry. The device's internal protection circuits remain functional within this full range.
Does the LTC3890IGN-1#TRPBF support both RSENSE and DCR current sensing?
Yes, the LTC3890IGN-1#TRPBF supports both RSENSE and DCR current sensing via its differential SENSE+ and SENSE− inputs per channel. The current comparator threshold is set by the ITH voltage and offset between SENSE+ and SENSE−, enabling accurate peak-current-mode control regardless of sensing method. Designers may select based on efficiency, cost, or board space requirements.
How does the EXTVCC feature improve system efficiency in the LTC3890IGN-1#TRPBF?
The EXTVCC pin on the LTC3890IGN-1#TRPBF allows the internal 5.1V INTVCC regulator to be powered from an external rail (≥4.7V) instead of VIN. When one of the LTC3890IGN-1#TRPBF's own output rails (e.g., 8.5V) supplies EXTVCC, the controller avoids dissipating power in the VIN-fed LDO-reducing total system losses by up to 150mW at full load and improving overall conversion efficiency.
Can the LTC3890IGN-1#TRPBF operate with only one channel enabled?
Yes, the LTC3890IGN-1#TRPBF supports independent channel control via RUN1 and RUN2 pins. Either channel can be disabled while the other remains fully operational. In single-channel sleep mode, quiescent current drops to 50µA-making it ideal for partial-power-down scenarios in battery-powered systems where background monitoring must persist while main processing is suspended.
What is the purpose of the TRACK/SS pins on the LTC3890IGN-1#TRPBF?
The TRACK/SS1 and TRACK/SS2 pins on the LTC3890IGN-1#TRPBF provide dual functionality: soft-start ramp control (via external capacitor charged by internal 1µA current source) and output voltage tracking (via external resistor divider). This enables precise power sequencing-such as ramping a 3.3V rail to match a 5V supply-or controlled startup to avoid inrush current in multi-rail systems.
LTC3890IGN-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
LTC3890IGN-1#TRPBF FAQ
1.How can I place an order for LTC3890IGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890IGN-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 LTC3890IGN-1#TRPBF reliable?
The price and inventory of LTC3890IGN-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 LTC3890IGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890IGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890IGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890IGN-1#TRPBF?
LTC3890IGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890IGN-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 LTC3890IGN-1#TRPBF?
For technical support, including LTC3890IGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890IGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3890IGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890IGN-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 LTC3890IGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890IGN-1#TRPBF?
All LTC3890IGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890IGN-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 LTC3890IGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890IGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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