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Analog Devices Inc. LTC3890HGN-3#PBF
- Part No.:
- LTC3890HGN-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890HGN-3#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,608
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Product details
Overview
LTC3890HGN-3#PBF 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 operates from 4V to 60V input, delivers up to 8.5V/3A and 3.3V/5A outputs, and features 50µA quiescent current in single-channel sleep mode - enabling long battery life in automotive always-on systems.
For engineers reviewing the LTC3890HGN-3#PBF datasheet, LTC3890HGN-3#PBF pinout, LTC3890HGN-3#PBF application, or LTC3890HGN-3#PBF equivalent, key selection considerations include its 180° out-of-phase dual control architecture, programmable 50kHz–900kHz switching frequency, RSENSE/DCR current sensing, and extended –40°C to 150°C junction temperature rating.
Technical Context
The LTC3890HGN-3#PBF implements constant-frequency current-mode control with independent error amplifiers (ITH1/ITH2), dual 180° out-of-phase PWM generators, and integrated OPTI-LOOP® compensation for stable transient response across wide output capacitance and ESR ranges. Its dual-channel architecture reduces input ripple and system noise by splitting input current between phases.
It supports three light-load operating modes via PLLIN/MODE pin: Burst Mode® (50µA IQ), pulse-skipping, or forced continuous conduction. The device integrates internal LDOs powered from VIN or EXTVCC (switchover at 4.7V), and includes dedicated TRACK/SS pins for soft-start or voltage tracking - critical for sequencing-sensitive applications like multi-rail FPGAs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input industrial, automotive, and battery-based systems including 12V/24V/48V buses and Li-ion/LiFePO₄ packs. |
| Quiescent Current | 50µA (one channel active) - extends runtime in always-on vehicle modules and portable instrumentation. |
| Output Voltage Range | 0.8V to 24V - enables generation of logic rails (1.2V, 1.8V, 3.3V), analog supplies (5V, 8.5V), and intermediate bus voltages. |
| Switching Frequency | 50kHz to 900kHz (programmable) - allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI filtering requirements. |
| Junction Temp Range | –40°C to 150°C - qualified for under-hood automotive applications and high-ambient industrial environments. |
| Current Sensing | RSENSE or DCR - supports precision lossless sensing in high-current designs or cost-effective discrete resistor solutions. |
| Duty Cycle Max | 99% - enables ultra-low dropout operation near VIN = VOUT, critical for high-voltage-to-low-voltage conversion (e.g., 60V→5V). |
Pinout & Package
28-Lead Plastic SSOP (GN) package, 5.6mm × 10.2mm, 0.635mm pitch, exposed pad for thermal enhancement. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / current limit control | Directly sets per-channel peak inductor current threshold; 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 current-sense resistor or DCR network; differential input with 64–85mV full-scale range. |
| SENSE1–, SENSE2– | Current sense negative input | Reference point for current comparator; supports ground-referenced sensing without VFB dependency. |
| PLLIN/MODE | Light-load mode select / sync input | Selects Burst Mode®, pulse-skipping, or forced CCM; accepts external clock for phase-locking up to 850kHz. |
| RUN1, RUN2 | Independent enable control | Digital shutdown inputs: <1.15V disables channel; both <0.7V enters ultra-low-IQ shutdown (<14µA). |
| TRACK/SS1, TRACK/SS2 | Soft-start / tracking input | Internal 1µA pull-up charges external capacitor for linear ramp; also accepts external voltage for supply tracking. |
| TG1, TG2 / BG1, BG2 | Top/bottom gate drivers | Drives N-MOSFET gates with 2.5Ω pull-up / 1.5Ω pull-down; supports bootstrap (TG) and grounded (BG) configurations. |
| VIN, PGND, SGND | Main power / power ground / signal ground | Separate PGND (high-current return) and SGND (precision reference) minimize noise coupling into feedback paths. |
| PGOOD1 | Power-good monitor | Open-drain output asserting when VFB1 deviates >±10% from regulation - provides system-level fault signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual control | Reduces input RMS current by ~30% and cuts required input capacitance by ~50% versus single-phase designs. |
| OPTI-LOOP® compensation | Enables stable loop response across 10× variation in output capacitor ESR and 100× capacitance range without redesign. |
| EXTVCC switchover | Automatically switches INTVCC power source from VIN to an external rail (e.g., 5V output) when EXTVCC >4.7V, improving overall system efficiency. |
| 99% duty cycle operation | Maintains regulation down to VIN – VOUT ≤ 0.6V, enabling high-step-down ratios (e.g., 60V→5V) without external LDO post-regulation. |
| Independent TRACK/SS pins | Supports staggered start-up or precise voltage tracking between dual outputs - essential for FPGA core/I/O rail sequencing. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC Dual-Rail Converter |
|---|---|
Use Scenario: Powering SoC, DDR memory, and display interface in head-unit with cold-crank (4.5V) and load-dump (60V) tolerance. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller managing 3.3V/5A (SoC I/O) and 1.2V/4A (core) rails with independent soft-start and PGOOD monitoring. Use Value: 50µA quiescent current prevents battery drain during vehicle sleep; 150°C rating ensures reliability under dashboard ambient temperatures. |
Use Scenario: Generating isolated 24V field bus and 5V logic rails from unregulated 36V–60V industrial DC bus. IC Role / Device Role / Timing Role: High-voltage dual controller delivering 24V/1.5A (field side) and 5V/3A (logic side) with out-of-phase operation minimizing input capacitor stress. Use Value: 60V max input withstands transients on factory floor power lines; RSENSE sensing enables accurate current limiting for motor driver protection. |
| Battery-Powered Test Equipment | Telecom Remote Radio Unit (RRU) |
Use Scenario: Portable oscilloscope requiring low-noise 3.3V analog and 1.8V digital supplies from 2-cell Li-ion (6–8.4V). IC Role / Device Role / Timing Role: Dual buck controller operating in Burst Mode® to maintain >85% efficiency at 100µA load while suppressing audible noise. Use Value: 50µA sleep IQ extends battery life beyond 100 hours; 180° phase shift minimizes conducted EMI into sensitive analog front-end. |
Use Scenario: Base station RRU needing 12V RF PA bias and 3.3V FPGA supply from -48V telecom rectified bus. IC Role / Device Role / Timing Role: Dual controller configured for 12V/2A (PA) and 3.3V/4A (FPGA) with EXTVCC powered from 12V rail to reduce total power loss. Use Value: EXTVCC switchover improves system efficiency by 2–3% vs. VIN-powered INTVCC; 150°C rating supports sealed outdoor enclosures. |
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 |
|---|---|---|---|
| LTC3890IGN-3#PBF | Same functionality and pinout; rated for –40°C to 125°C junction temperature (vs. 150°C for LTC3890HGN-3#PBF). | Suitable for commercial/industrial environments but not under-hood automotive or high-ambient industrial use. | Select LTC3890IGN-3#PBF only if 125°C max junction is sufficient and cost sensitivity outweighs thermal margin needs. |
| LTC3890MPGN-3#PBF | Same functionality and pinout; rated for –55°C to 150°C with enhanced screening for military/aerospace use. | Required for extended temperature or high-reliability programs where MIL-PRF-38535 compliance is mandated. | Choose LTC3890MPGN-3#PBF when extended low-temp operation or qualification to space/military standards is required. |
Compared with LTC3890IGN-3#PBF, the LTC3890HGN-3#PBF offers higher thermal margin for automotive under-hood deployment; compared with LTC3890MPGN-3#PBF, it provides identical high-temp capability at lower cost and without military-grade screening overhead.
Availability
LTC3890HGN-3#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, battery-powered test equipment, and telecom remote radio units requiring stable component supply across extended temperature ranges.
Supply support for LTC3890HGN-3#PBF 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 automotive, industrial, communications, and healthcare markets.
The LTC3890 family was designed specifically for high-efficiency, high-voltage dual-output DC/DC conversion in space-constrained, thermally demanding applications - emphasizing low IQ, wide VIN, and robust sequencing control.
FAQ
What is the maximum input voltage rating for the LTC3890HGN-3#PBF?
The LTC3890HGN-3#PBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 4V to 60V. This wide input range supports 12V, 24V, and 48V battery systems, as well as industrial and automotive applications subject to load dump and cold-crank conditions. Exceeding 65V may cause permanent damage.
How does the LTC3890HGN-3#PBF achieve 50µA quiescent current?
The LTC3890HGN-3#PBF achieves 50µA quiescent current by entering Sleep Mode when one channel is active and light-load conditions trigger the PLLIN/MODE pin to select Burst Mode® operation. In this state, internal circuitry-including gate drivers and portions of the error amplifier-is disabled while maintaining regulation via periodic burst pulses. The LTC3890HGN-3#PBF draws only 14µA in full shutdown (both RUN pins <0.7V).
Can the LTC3890HGN-3#PBF synchronize to an external clock?
Yes, the LTC3890HGN-3#PBF can synchronize to an external clock via the PLLIN/MODE pin, supporting phase-locking from 75kHz to 850kHz. When an external clock is applied, the rising edge of TG1 aligns with the external clock's rising edge. This feature reduces EMI by enabling deterministic switching and facilitates multi-phase synchronization in complex power systems using the LTC3890HGN-3#PBF.
What is the purpose of the EXTVCC pin on the LTC3890HGN-3#PBF?
The EXTVCC pin on the LTC3890HGN-3#PBF allows the internal INTVCC regulator to be powered from an external supply (e.g., one of the converter's own outputs) instead of VIN, improving overall system efficiency. When EXTVCC exceeds 4.7V, the device automatically switches from the VIN-powered LDO to the EXTVCC-powered LDO, reducing power dissipation and heat generation - especially beneficial in high-input-voltage, low-output-voltage applications using the LTC3890HGN-3#PBF.
Does the LTC3890HGN-3#PBF support independent voltage tracking between its two outputs?
Yes, the LTC3890HGN-3#PBF supports independent voltage tracking via dedicated TRACK/SS1 and TRACK/SS2 pins. Each pin accepts an external voltage reference (e.g., from a resistor divider on another supply) or an RC ramp to coordinate start-up sequencing. This enables precise tracking of one output to another - such as ramping a 3.3V rail to follow a 5V rail - ensuring safe FPGA or processor power-up using the LTC3890HGN-3#PBF.
LTC3890HGN-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3890HGN-3#PBF FAQ
1.How can I place an order for LTC3890HGN-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890HGN-3#PBF 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 LTC3890HGN-3#PBF reliable?
The price and inventory of LTC3890HGN-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890HGN-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890HGN-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890HGN-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890HGN-3#PBF?
LTC3890HGN-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890HGN-3#PBF 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 LTC3890HGN-3#PBF?
For technical support, including LTC3890HGN-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890HGN-3#PBF requirements.
6.How does Aetrix verify that LTC3890HGN-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890HGN-3#PBF 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 LTC3890HGN-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890HGN-3#PBF?
All LTC3890HGN-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890HGN-3#PBF, 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 LTC3890HGN-3#PBF part is unused and in its original packaging.
Return procedure for LTC3890HGN-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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