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Analog Devices Inc. LTC3890IGN-3#TRPBF
- Part No.:
- LTC3890IGN-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890IGN-3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,261
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Product details
Overview
LTC3890IGN-3#TRPBF from Analog Devices (formerly Linear Technology) is a dual, 2-phase synchronous step-down DC/DC controller driving all-N-channel MOSFET stages for high-efficiency power conversion. It supports 4V–60V input, delivers two independent outputs (0.8V–24V), operates at up to 850kHz with phase-lock capability, 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 LTC3890IGN-3#TRPBF datasheet, LTC3890IGN-3#TRPBF pinout, LTC3890IGN-3#TRPBF application, or LTC3890IGN-3#TRPBF equivalent, key selection criteria include its dual out-of-phase architecture reducing input ripple, OPTI-LOOP® compensation for wide output capacitor/ESR flexibility, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and automotive-grade –40°C to 125°C operation in 28-lead SSOP.
Technical Context
The LTC3890IGN-3#TRPBF implements constant-frequency current-mode control with independent error amplifiers (ITH1/ITH2), differential current sensing (SENSE1±/SENSE2±), and 180° out-of-phase operation between channels to minimize input capacitance requirements and supply-induced noise. Its PLLIN/MODE pin selects light-load behavior-Burst Mode (≤0.8V), pulse-skipping (1.2V–INTVCC−1.3V), or forced continuous (tied to INTVCC).
It integrates dual gate drivers (TG1/BG1/TG2/BG2) with 2.5Ω pull-up and 1.5Ω pull-down on top-side drivers, supports RSENSE or DCR sensing, and features internal LDOs powered from VIN or EXTVCC (switchover at 4.7V). The device includes independent TRACK/SS pins for soft-start or voltage tracking, PGOOD1 monitoring, and 99% duty-cycle dropout capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide intermediate bus voltages and battery chemistries including 12V, 24V, and 48V systems. |
| IQ (One Channel Active) | 50µA - extends battery life in always-on applications without compromising startup responsiveness. |
| VOUT Range | 0.8V to 24V - enables generation of common logic rails (3.3V, 5V, 8.5V) and higher bias supplies from single controller. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design across diverse load conditions. |
| Current Sensing | RSENSE or DCR - eliminates need for dedicated current-sense transformers or high-precision shunts in cost-sensitive designs. |
| Duty Cycle Max | 99% - ensures stable regulation even during deep input voltage droop (e.g., cold-crank automotive scenarios). |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive and industrial embedded environments. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 5.6mm × 10.2mm, 0.635mm pitch, RoHS-compliant, tape-and-reel (TRPBF).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / current limit setpoint | Controls peak inductor current per channel; voltage directly sets current comparator trip threshold. |
| VFB1, VFB2 | Feedback input | Monitors regulated output via external resistor divider; referenced to 0.800V internal bandgap. |
| SENSE1+, SENSE2+ | Current sense (+) input | Connects to high-side of RSENSE or DCR network; differential pair with SENSE– determines current limit. |
| SENSE1–, SENSE2– | Current sense (–) input | Common-mode range supports ground-referenced sensing; bias current <±1µA minimizes offset errors. |
| 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/disable | Digital control inputs; shutdown thresholds (1.15V/1.20V) allow independent sequencing and ultra-low shutdown IQ (<14µA). |
| TG1, TG2 | Top N-MOSFET gate driver output | Floating drivers with ~2.5Ω pull-up; voltage swing = INTVCC − 0.5V superimposed on SW node. |
| BG1, BG2 | Bottom N-MOSFET gate driver output | Ground-referenced drivers with ~1.1Ω pull-down; drives synchronous rectifier with fast 25ns rise/fall times. |
| TRACK/SS1, TRACK/SS2 | Soft-start / tracking input | Internal 1µA pull-up charges external capacitor for linear ramp; also accepts resistor divider for supply tracking. |
| PGOOD1 | Power-good monitor | Open-drain output asserting when VFB1 deviates >±10% from setpoint - enables system-level fault detection and sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~30%, enabling smaller input capacitors and lower EMI filter cost. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitor values (10µF–1000µF) and ESR (0.5mΩ–100mΩ). |
| Selectably optimized light-load efficiency | Burst Mode achieves >85% efficiency at 1mA load; pulse-skipping maintains low-noise fixed-frequency operation. |
| Auto-recharge dropout protection | Detects continuous top-FET conduction and forces periodic bottom-FET turn-on to refresh bootstrap capacitors. |
| Independent soft-start/tracking | Enables controlled power-up sequencing between multiple rails or alignment with external supplies (e.g., MCU core vs I/O). |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual-rail power for SoC (3.3V core) and display interface (8.5V backlight) in head-unit under varying battery voltage (6V–16V). IC Role / Device Role / Timing Role: Dual synchronous buck controller delivering regulated, sequenced outputs with automotive-grade thermal and EMI robustness. Use Value: 50µA quiescent current prevents battery drain during vehicle sleep; 60V abs max input withstands load-dump transients. |
Use Scenario: Distributed 5V and 24V auxiliary rails in programmable logic controller with isolated field I/O and communication interfaces. IC Role / Device Role / Timing Role: High-voltage dual controller generating local supplies from 48V backplane while minimizing board area and heat dissipation. Use Value: Out-of-phase operation reduces input capacitor stress; 125°C rating ensures reliability in enclosed enclosures without forced air cooling. |
| Battery-Powered Test Equipment | Medical Point-of-Care Monitor |
|
Use Scenario: Portable oscilloscope requiring clean 3.3V digital and 5V analog supplies from Li-ion battery (3.0V–4.2V) with extended runtime. IC Role / Device Role / Timing Role: Dual buck controller with adaptive light-load mode selection to maximize energy efficiency across dynamic measurement loads. Use Value: Burst Mode operation sustains >80% efficiency down to 100µA load; 99% duty cycle enables full regulation during battery discharge. |
Use Scenario: Compact patient monitor needing isolated 3.3V logic and 12V sensor bias from single 12V medical-grade adapter. IC Role / Device Role / Timing Role: Dual-output controller providing independently tracked start-up and precise voltage regulation meeting IEC 60601-1 safety margins. Use Value: Independent TRACK/SS pins ensure synchronized rail ramp-up; PGOOD1 enables fail-safe system initialization before firmware execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3890-1#TRPBF | Includes ILIM pin for adjustable current-sense threshold and CLKOUT/PHASMD pins for PolyPhase® operation; lacks independent PGOOD2. | Required for multi-phase interleaving or custom overcurrent threshold tuning; not drop-in due to pin count and function differences. | Choose LTC3890-1#TRPBF only if PolyPhase® expansion or programmable current limit is needed; otherwise LTC3890IGN-3#TRPBF offers simpler layout and lower BOM cost. |
| MP2918GL-Z | Single-chip dual controller with integrated MOSFET drivers but no phase-lock capability; max VIN = 36V; IQ = 120µA (both channels). | Suitable for space-constrained 24V systems where 60V rating is unnecessary; lacks automotive temp grade and Burst Mode efficiency. | MP2918GL-Z fits compact consumer-grade designs with ≤36V input; LTC3890IGN-3#TRPBF remains preferred for 48V+ industrial/automotive use with superior light-load IQ and thermal spec. |
Compared with LTC3890-1#TRPBF, the LTC3890IGN-3#TRPBF trades PolyPhase® expandability for simplified pinout and reduced external component count; versus MP2918GL-Z, it delivers higher input voltage tolerance, lower quiescent current, and broader temperature qualification - critical for mission-critical power rails.
Availability
LTC3890IGN-3#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and battery-powered test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3890IGN-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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio, emphasizing precision, efficiency, and ruggedness for demanding applications.
The LTC3890 family targets high-reliability dual-output DC/DC conversion in automotive, industrial, and telecom infrastructure - designed specifically for systems requiring wide input range, ultra-low IQ, and flexible light-load operation without sacrificing transient response.
FAQ
What is the maximum input voltage rating for the LTC3890IGN-3#TRPBF?
The LTC3890IGN-3#TRPBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 4V to 60V. This allows safe operation in 48V industrial buses and automotive systems subject to load-dump transients up to 60V, provided external clamping or filtering meets ISO 7637-2 requirements.
Does the LTC3890IGN-3#TRPBF support independent output voltage tracking?
Yes, the LTC3890IGN-3#TRPBF supports independent output voltage tracking via dedicated TRACK/SS1 and TRACK/SS2 pins. Each pin accepts an external resistor divider from a reference supply, allowing VOUT1 and VOUT2 to ramp in alignment with other system rails during power-up - essential for FPGA or processor core/I/O sequencing.
How does the LTC3890IGN-3#TRPBF achieve 50µA quiescent current?
The LTC3890IGN-3#TRPBF achieves 50µA quiescent current in single-channel sleep mode by disabling non-essential circuitry-including one error amplifier, gate drivers, and oscillator sections-while maintaining bias on the active channel's control loop. Shutdown IQ drops further to <14µA when both RUN1 and RUN2 are pulled below 0.7V.
Can the LTC3890IGN-3#TRPBF synchronize to an external clock?
Yes, the LTC3890IGN-3#TRPBF can synchronize to an external clock applied to the PLLIN/MODE pin. When an external signal is present, its internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge, enabling deterministic switching and EMI reduction in multi-controller systems.
What package type and temperature grade does the LTC3890IGN-3#TRPBF use?
The LTC3890IGN-3#TRPBF uses a 28-lead plastic SSOP (GN) package and is rated for operation from –40°C to 125°C junction temperature. The "I" grade designation confirms full automotive qualification per AEC-Q100 stress testing, making it suitable for under-hood and industrial control applications.
LTC3890IGN-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
LTC3890IGN-3#TRPBF FAQ
1.How can I place an order for LTC3890IGN-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890IGN-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 LTC3890IGN-3#TRPBF reliable?
The price and inventory of LTC3890IGN-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 LTC3890IGN-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890IGN-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890IGN-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890IGN-3#TRPBF?
LTC3890IGN-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890IGN-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 LTC3890IGN-3#TRPBF?
For technical support, including LTC3890IGN-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890IGN-3#TRPBF requirements.
6.How does Aetrix verify that LTC3890IGN-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890IGN-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 LTC3890IGN-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890IGN-3#TRPBF?
All LTC3890IGN-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890IGN-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 LTC3890IGN-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890IGN-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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