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Analog Devices Inc. LTC3890IUH-2#PBF
- Part No.:
- LTC3890IUH-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890IUH-2#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,478
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Product details
Overview
LTC3890IUH-2#PBF from Analog Devices 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 0.8V–24V adjustable output voltage per channel, features 50µA quiescent current (one channel active), and supports out-of-phase operation to reduce input ripple-ideal for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890IUH-2#PBF datasheet, LTC3890IUH-2#PBF pinout, LTC3890IUH-2#PBF application, or LTC3890IUH-2#PBF equivalent, key selection criteria include its AEC-Q100 qualification, dual-channel phase-lockable frequency (75–850kHz), selectable light-load modes (Burst Mode®, pulse-skipping, continuous), RSENSE/DCR sensing flexibility, and 99% duty cycle dropout capability.
Technical Context
The LTC3890IUH-2#PBF implements constant-frequency current-mode control with independent error amplifiers (ITH1/ITH2) and differential current sense comparators (SENSE1±/SENSE2±). Each channel features dedicated TRACK/SS pins for soft-start or voltage tracking, and PGOOD1/PGOOD2 open-drain monitors with ±10% trip hysteresis.
Its dual 180° out-of-phase architecture minimizes input capacitor RMS current and power supply noise. The internal 5.1V INTVCC LDO can be powered from VIN or an external EXTVCC ≥4.7V, enabling efficient self-biasing from one of its own regulated outputs.
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 rails without external pre-regulation. |
| Quiescent Current | 50µA (one channel active) - extends runtime in always-on automotive modules and portable instrumentation. |
| Output Voltage Range | 0.8V to 24V per channel - enables direct generation of logic, I/O, and analog supply rails from single high-voltage source. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics while supporting synchronization across multiple controllers. |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., cold-crank 4.5V input with 3.3V output). |
| Current Sensing | RSENSE or DCR - eliminates need for dedicated current-sense resistors in high-current applications, reducing power loss and board space. |
| Operating Temp Range | –40°C to +125°C junction - qualified for under-hood automotive environments and industrial embedded systems. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND), 0.75mm profile - optimized for high-power density and thermal performance in space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (Pins 1, 9) | Differential current sense (–) input | Supplies bias current when > INTVCC – 0.5V; enables accurate DCR sensing with ground-referenced networks. |
| FREQ (Pin 2) | VCO frequency programming | Resistor-to-GND sets 50–900kHz fixed frequency; tie to INTVCC/GND for 535kHz/350kHz defaults. |
| PLLIN/MODE (Pin 5) | Sync input & light-load mode select | Accepts external clock (75–850kHz) or selects Burst Mode® (GND/floating), pulse-skipping (1.2–INTVCC–1.3V), or forced CCM (INTVCC). |
| TG1/TG2 (Pins 26, 15) | Top N-MOSFET gate drivers | Floating drivers with swing = INTVCC – 0.5V superimposed on SW node - supports high-side switching up to 65V VIN. |
| PGOOD1/PGOOD2 (Pins 27, 14) | Open-drain power-good indicators | Assert low when VFB deviates >±10% from 0.8V reference - enables sequenced system startup and fault isolation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade I qualification | Validated for automotive under-hood use (-40°C to +125°C), including HTOL, temperature cycling, and ESD robustness. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of output capacitors (including low-ESR ceramic) without external tuning. |
| Independent TRACK/SS pins | Allows per-channel soft-start ramp time control or precise voltage tracking of external supplies during power-up. |
| Selectably programmable current limit | ILIM pin (Pin 28) configures max sense threshold to 22mV (GND), 43mV (FLOAT), or 64mV (INTVCC) - simplifies overcurrent protection design. |
| Low shutdown IQ & dual RUN control | 14µA total shutdown current; independent RUN1/RUN2 pins enable asymmetric channel enable/disable for dynamic power management. |
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 with 12V battery input and cold-crank tolerance. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent output regulation, sequencing, and fault reporting. Use Value: 50µA IQ preserves battery during sleep; 99% duty cycle sustains 3.3V output down to 4.5V input; AEC-Q100 ensures reliability in vibration/temperature extremes. |
Use Scenario: Distributed 24V-to-3.3V/8.5V conversion for sensor signal conditioning and actuator driver circuits in modular PLC backplane. IC Role / Device Role / Timing Role: High-efficiency dual-output DC/DC controller delivering isolated, low-noise rails with minimal input capacitance due to out-of-phase operation. Use Value: 180° phase shift cuts input ripple by ~30%, reducing bulk capacitor size; RSENSE/DCR flexibility accommodates diverse current-sense layouts across modules. |
| Battery-Powered Test Equipment | Distributed Telecom Power System |
Use Scenario: Portable oscilloscope requiring ultra-low standby power, fast wake-up, and clean analog/digital supply separation from Li-ion pack (8–26V). IC Role / Device Role / Timing Role: Dual-channel controller with independent RUN/PGOOD for rail-specific enablement and health monitoring. Use Value: Selectable Burst Mode® achieves >85% efficiency at 100µA load; TRACK/SS1/SS2 enables synchronized soft-start to prevent inrush-induced brownout. |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying 3.3V FPGA core and 8.5V transceiver rails with strict EMI limits. IC Role / Device Role / Timing Role: Phase-lockable dual controller synchronized to system clock to suppress beat frequencies and simplify filtering. Use Value: PLLIN/MODE pin enables deterministic jitter-free synchronization; 75–850kHz range allows optimal trade-off between efficiency and filter size. |
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 |
|---|---|---|---|
| LTC3890EUH-2#PBF | Same silicon, commercial-grade (–40°C to +125°C), non-AEC-Q100 qualified | Suitable for industrial or consumer designs where automotive reliability testing is not required | Lower cost alternative when AEC-Q100 certification is unnecessary; identical pinout and electrical specs. |
| LTC3890HUH-2#PBF | Same silicon, extended temp grade (–40°C to +150°C), higher junction temp rating | Required for under-hood applications exceeding +125°C ambient or high-power-density enclosures | Preferred for extreme thermal environments; shares layout and firmware compatibility but requires higher-temp PCB materials. |
Compared with LTC3890IUH-2#PBF, the EUH variant reduces cost for non-automotive use without sacrificing performance, while the HUH variant extends thermal margin for harsher deployments-both retain identical functionality, pinout, and feature set.
Availability
LTC3890IUH-2#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3890IUH-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3890 family was designed specifically for high-efficiency, high-reliability dual-output DC/DC conversion in automotive and industrial applications-emphasizing low IQ, wide VIN, phase interleaving, and robust fault management.
FAQ
What is the maximum input voltage rating for the LTC3890IUH-2#PBF?
The LTC3890IUH-2#PBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 4V to 60V. This allows safe operation across 12V, 24V, and 48V automotive and industrial bus systems, including transient spikes during load dump or cold-crank conditions.
Does the LTC3890IUH-2#PBF support synchronization to an external clock?
Yes, the LTC3890IUH-2#PBF supports external clock synchronization via the PLLIN/MODE pin, accepting input frequencies from 75kHz to 850kHz. When an external clock is applied, the phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge-enabling deterministic timing across multi-controller systems.
How does the ILIM pin affect current limiting on the LTC3890IUH-2#PBF?
The ILIM pin (Pin 28) on the LTC3890IUH-2#PBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This directly scales the peak inductor current limit for both channels without requiring resistor changes in the sense network.
Can the LTC3890IUH-2#PBF operate with only one output enabled?
Yes, the LTC3890IUH-2#PBF supports independent channel control via RUN1 and RUN2 pins. Pulling RUN1 below 1.15V disables Channel 1 while keeping Channel 2 active-and vice versa. Both channels shut down fully only when both RUN pins fall below 0.7V, drawing just 14µA total.
What package type and thermal characteristics does the LTC3890IUH-2#PBF use?
The LTC3890IUH-2#PBF uses a 32-lead 5mm × 5mm plastic QFN package with exposed thermal pad (Pin 33 = SGND). Its θJA is 34°C/W, and the exposed pad must be soldered to PCB ground for rated thermal performance-supporting >5W dissipation in typical 4-layer automotive layouts.
LTC3890IUH-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- 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, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890IUH-2#PBF FAQ
1.How can I place an order for LTC3890IUH-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890IUH-2#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 LTC3890IUH-2#PBF reliable?
The price and inventory of LTC3890IUH-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890IUH-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890IUH-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890IUH-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890IUH-2#PBF?
LTC3890IUH-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890IUH-2#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 LTC3890IUH-2#PBF?
For technical support, including LTC3890IUH-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890IUH-2#PBF requirements.
6.How does Aetrix verify that LTC3890IUH-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890IUH-2#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 LTC3890IUH-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890IUH-2#PBF?
All LTC3890IUH-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890IUH-2#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 LTC3890IUH-2#PBF part is unused and in its original packaging.
Return procedure for LTC3890IUH-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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