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Analog Devices Inc. LTC3890HUH#PBF
- Part No.:
- LTC3890HUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890HUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
LTC3890HUH#PBF from Analog Devices is a 60V input, dual-phase synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages. It delivers 50µA quiescent current (one channel active), supports 0.8V–24V output range, operates out-of-phase to reduce input ripple, and is AEC-Q100 qualified for automotive always-on systems.
For engineers reviewing the LTC3890HUH#PBF datasheet, LTC3890HUH#PBF pinout, LTC3890HUH#PBF application, or LTC3890HUH#PBF equivalent, key selection criteria include its 4V–60V wide VIN range, selectable light-load modes (Burst/Pulse-Skipping/Continuous), phase-lockable 75kHz–850kHz frequency, and dual independent TRACK/SS pins for soft-start or voltage tracking in multi-rail power systems.
Technical Context
The LTC3890HUH#PBF implements a constant-frequency current-mode architecture with two fully independent controllers operating 180° out-of-phase. Each channel features OPTI-LOOP® compensation, precision 0.8V reference (±1.2mV over temperature), and programmable current limit via ILIM pin selection (GND/FLOAT/INTVCC).
Its dual-controller design enables coordinated start-up via separate TRACK/SS pins, independent RUN control, and flexible current sensing using either RSENSE or DCR networks. The internal 5.1V INTVCC LDO can be powered from VIN or an external EXTVCC supply ≥4.7V, improving system efficiency in multi-output configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V battery and intermediate bus inputs, with 65V absolute max rating. |
| Quiescent Current | 50µA (one channel active) - extends runtime in battery-powered automotive modules and always-on ECUs. |
| Output Voltage Range | 0.8V to 24V - enables generation of logic rails (3.3V/5V), analog supplies (8.5V), and higher-voltage bias rails. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics while maintaining tight regulation. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation near VIN = VOUT, critical for cold-crank automotive conditions. |
| Operating Temp | –40°C to +150°C junction - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
| Package | 32-lead 5mm × 5mm QFN (UH), exposed pad soldered to SGND - provides low thermal resistance (θJA = 34°C/W). |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND). Requires PCB soldering of exposed pad for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Supplies current to comparator when > INTVCC – 0.5V; enables accurate DCR/RSENSE sensing with common-mode rejection. |
| FREQ (2) | VCO frequency programming | Resistor-to-GND sets frequency from 50kHz–900kHz; internal 20µA pull-up enables precise voltage-controlled oscillator tuning. |
| PLLIN/MODE (5) | Sync input & light-load mode select | Accepts external clock for synchronization; selects Burst Mode (GND/floating), Pulse-Skipping (1.2V–INTVCC–1.3V), or Continuous (INTVCC). |
| TRACK/SS1 / TRACK/SS2 (13, 29) | Soft-start & voltage tracking control | Internal 1µA pull-up charges external capacitor for linear ramp; also accepts resistor divider for rail tracking during startup. |
| ILIM (28) | Current limit threshold select | Three-level current sense threshold (22/43/64mV) set by tying to SGND/FLOAT/INTVCC - avoids external resistors for foldback tuning. |
| PGOOD1 / PGOOD2 (14, 27) | Open-drain power-good indicator | Asserts low when VFB deviates > ±10% from 0.8V - enables sequencing and fault reporting without external comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces input capacitor RMS current by ~30% and lowers conducted EMI vs. in-phase operation - cuts required CIN volume by up to 50%. |
| OPTI-LOOP® compensation | Allows stable loop response across wide output capacitance (10µF–1000µF) and ESR ranges - eliminates need for custom compensation per design. |
| Independent RUN1/RUN2 control | Enables staggered enable/disable of outputs - supports dynamic power management in multi-rail systems without external logic. |
| Low dropout operation (99% duty) | Maintains regulation down to VIN – VOUT ≈ 0.1V - essential for automotive cold-crank (6.5V VIN) powering 5V/3.3V rails. |
| EXTVCC switchover LDO | Automatically switches INTVCC source from VIN to external supply ≥4.7V - improves overall system efficiency when powering INTVCC from a regulated 5V rail. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual-rail power for SoC (3.3V/1.2V) and display interface (8.5V) in head-unit under varying battery voltage (6V–16V). IC Role / Device Role / Timing Role: Dual-phase controller managing independent 3.3V/5A and 8.5V/3A outputs with out-of-phase switching to minimize input ripple. Use Value: 50µA IQ extends standby time; AEC-Q100 H-grade ensures reliability at 150°C junction; TRACK/SS pins enable synchronized startup with SoC reset timing. |
Use Scenario: Distributed 24V-to-5V/3.3V conversion in modular I/O backplane with strict EMI limits. IC Role / Device Role / Timing Role: Dual controller generating isolated 5V logic and 3.3V FPGA rails, synchronized to system clock via PLLIN/MODE. Use Value: Phase-lockable frequency (75–850kHz) enables EMI spread-spectrum alignment; 99% duty cycle sustains output during brownouts. |
| Battery-Powered Test Equipment | Rail-to-Rail Industrial Sensor Hub |
|
Use Scenario: Portable oscilloscope requiring low-noise 3.3V analog and 5V digital rails from 12V Li-ion pack (10.8V–13.2V). IC Role / Device Role / Timing Role: Dual controller with Burst Mode operation minimizing no-load power loss; independent soft-start prevents inrush into sensitive analog circuitry. Use Value: 50µA IQ doubles battery life in sleep mode; out-of-phase operation reduces input cap size and board area by 40% vs. single-phase solution. |
Use Scenario: Multi-sensor node with mixed 3.3V, 5V, and 12V analog front-ends powered from 24V industrial bus. IC Role / Device Role / Timing Role: Primary controller for 5V/3A rail; secondary channel configured as adjustable 0.8V–12V bias supply via feedback divider. Use Value: Wide 0.8V–24V VOUT range eliminates need for additional regulators; ILIM pin simplifies current limit setting across diverse sensor loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891IUH#PBF | Same architecture but fixed 180° phase offset only; no PHASMD pin for 120°/240° options; identical 4V–60V VIN, 50µA IQ, and AEC-Q100 I-grade (–40°C to 125°C). | Lacks phase flexibility for >2-phase daisy-chaining; suitable where only 180° out-of-phase operation is needed and extended temperature is not required. | Select LTC3891IUH#PBF if phase-programmability is unnecessary and 125°C max junction suffices for the application environment. |
| MP2918GL-Z | Monolithic dual controller (integrated MOSFETs); lower VIN max (36V); higher IQ (120µA); no EXTVCC support; non-AEC-Q100; 20-pin QFN package. | Targets cost-sensitive, space-constrained consumer/industrial designs; lacks automotive qualification and high-VIN capability. | Choose MP2918GL-Z only for non-automotive, <36V systems where integrated FETs and smaller footprint outweigh efficiency and qualification needs. |
Compared with LTC3891IUH#PBF, the LTC3890HUH#PBF adds phase-programmability and extended 150°C operation for under-hood use; versus MP2918GL-Z, it offers higher voltage resilience, lower quiescent current, and automotive qualification - making it the sole choice for demanding automotive dual-rail power.
Availability
LTC3890HUH#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 across extended temperature and high-reliability environments.
Supply support for LTC3890HUH#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.
The LTC3890HUH#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, high-reliability DC/DC conversion in automotive and industrial applications demanding wide input range, low IQ, and AEC-Q100 compliance.
FAQ
What is the maximum junction temperature rating for the LTC3890HUH#PBF?
The LTC3890HUH#PBF is specified for operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified for Grade H automotive applications. This rating is confirmed in the Absolute Maximum Ratings table and supported by thermal characterization data showing θJA = 34°C/W with proper exposed pad soldering. The LTC3890HUH#PBF must be mounted on a thermally robust PCB layout to sustain continuous 150°C operation.
How does the ILIM pin configure current limit thresholds on the LTC3890HUH#PBF?
The ILIM pin on the LTC3890HUH#PBF selects one of three maximum current sense thresholds: 22mV (ILIM = SGND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). These values are measured at the SENSE+–SENSE– differential input and directly set the peak inductor current trip point for both channels. The LTC3890HUH#PBF uses this pin to eliminate external resistor networks for current limit tuning, simplifying design and improving accuracy across temperature.
Can the LTC3890HUH#PBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3890HUH#PBF synchronizes to an external clock applied to the PLLIN/MODE pin, supporting a valid input frequency range of 75kHz to 850kHz. The internal phase-locked loop locks the rising edge of TG1 to the rising edge of the external clock. This capability enables deterministic EMI reduction and multi-phase coordination in complex power systems. The LTC3890HUH#PBF maintains full regulation and transient response during synchronization.
What is the purpose of the PHASMD pin on the LTC3890HUH#PBF, and what phase relationships does it support?
The PHASMD pin on the LTC3890HUH#PBF configures the relative phase relationship between TG1, TG2, and CLKOUT. Pulling PHASMD to GND yields 180° (TG2) and 60° (CLKOUT) offsets; tying to INTVCC gives 240° and 120°; floating defaults to 180° and 90°. This programmability enables optimal input capacitor stress reduction and flexible daisy-chaining of multiple controllers - a feature unique to the LTC3890HUH#PBF within its product family.
Does the LTC3890HUH#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3890HUH#PBF supports output voltage tracking via dedicated TRACK/SS1 and TRACK/SS2 pins. Each pin accepts an external resistor divider from a master supply, causing the corresponding VOUT to ramp proportionally during startup. Alternatively, a capacitor to SGND creates a linear soft-start ramp via the internal 1µA pull-up current. This dual-mode capability is built into the LTC3890HUH#PBF's error amplifier architecture and requires no external ICs.
LTC3890HUH#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
- 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:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890HUH#PBF FAQ
1.How can I place an order for LTC3890HUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890HUH#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 LTC3890HUH#PBF reliable?
The price and inventory of LTC3890HUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890HUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890HUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890HUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890HUH#PBF?
LTC3890HUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890HUH#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 LTC3890HUH#PBF?
For technical support, including LTC3890HUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890HUH#PBF requirements.
6.How does Aetrix verify that LTC3890HUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890HUH#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 LTC3890HUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890HUH#PBF?
All LTC3890HUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890HUH#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 LTC3890HUH#PBF part is unused and in its original packaging.
Return procedure for LTC3890HUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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