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Analog Devices Inc. LTC3890HUH-2#PBF
- Part No.:
- LTC3890HUH-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890HUH-2#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,329
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Product details
Overview
LTC3890HUH-2#PBF from Analog Devices is a high-efficiency, dual-phase synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages. It operates from 4V to 60V input, delivers up to 8.5V/3.3V outputs, and features 50µA quiescent current in single-channel sleep mode - enabling long runtime in automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890HUH-2#PBF datasheet, LTC3890HUH-2#PBF pinout, LTC3890HUH-2#PBF application, or LTC3890HUH-2#PBF equivalent, key selection considerations include its AEC-Q100 qualification for automotive use, out-of-phase operation reducing input ripple, selectable light-load modes (Burst Mode®, pulse-skipping, continuous), and 180° phase shift between channels for optimized thermal and EMI performance.
Technical Context
The LTC3890HUH-2#PBF implements a constant-frequency current-mode architecture with independent error amplifiers, transconductance compensation (OPTI-LOOP®), and dual 32-pin QFN package routing for separate SGND and PGND paths. Its two controllers operate 180° out-of-phase to minimize input capacitor RMS current and power supply noise.
It supports RSENSE or DCR current sensing, programmable frequency (50kHz–900kHz), and phase-lockable synchronization (75kHz–850kHz). The device integrates internal LDOs for gate drive (INTVCC = 5.1V), supports EXTVCC switchover at 4.7V, and provides independent TRACK/SS pins for soft-start or output voltage tracking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide battery chemistries (12V, 24V, 48V) and intermediate bus voltages without external pre-regulation. |
| Quiescent Current (Sleep) | 50µA (one channel active) - extends battery life in always-on automotive modules and portable instrumentation. |
| Output Voltage Range | 0.8V to 24V - enables flexible generation of logic rails (3.3V, 5V), analog supplies (±12V), and industrial I/O voltages. |
| Phase Shift | 180° between channels - reduces input capacitor size by ~50% and lowers peak input current stress. |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications including ADAS ECUs and infotainment power supplies. |
| Current Sense Threshold | Selectable 22mV / 43mV / 64mV via ILIM pin - allows precise overcurrent protection tuning for diverse MOSFET RDS(on) and DCR values. |
| Shutdown IQ | <14µA - ensures minimal parasitic drain during vehicle ignition-off states. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed pad (Pin 33 = SGND), 0.75mm profile, RoHS-compliant lead-free finish. Thermal resistance θJA = 34°C/W; exposed pad must be soldered to PCB ground for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Accepts common-mode voltage up to 28V; bias current ±1µA enables accurate DCR or RSENSE sensing across wide temperature range. |
| TG1 / TG2 (26, 15) | Top N-MOSFET gate driver output | Floating driver with INTVCC-referenced swing; supports >99% duty cycle in dropout via integrated dropout detector. |
| BG1 / BG2 (23, 18) | Bottom N-MOSFET gate driver output | Ground-referenced driver (0V to INTVCC); fast rise/fall times (25ns/16ns) ensure low switching losses. |
| TRACK/SS1 / TRACK/SS2 (29, 13) | Soft-start and voltage tracking input | 1µA internal pull-up enables RC ramp control; supports sequencing with other regulators or external reference tracking. |
| PLLIN/MODE (5) | Light-load mode select & sync input | Configures Burst Mode® (ground), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC); also accepts external clock for synchronization. |
| PGOOD1 / PGOOD2 (27, 14) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 0.8V setpoint; includes 2.5% hysteresis for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces input capacitor RMS current by ~70%, enabling smaller, lower-cost bulk capacitance and lower EMI emissions. |
| OPTI-LOOP® compensation | Allows stable loop response across wide output capacitor ESR ranges (e.g., ceramic + polymer hybrids), eliminating need for external compensation redesign. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C junction operation - suitable for engine control units, transmission control modules, and ADAS camera power supplies. |
| Independent RUN1/RUN2 control | Enables asymmetric enable/disable sequencing - e.g., keep core rail active while disabling peripheral rail during low-power states. |
| EXTVCC switchover | Automatically switches INTVCC sourcing from VIN to an external 4.7V–13V supply (e.g., 5V buck output), improving overall system efficiency by bypassing VIN LDO losses. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering radar sensor SoCs and image signal processors in forward-facing camera modules requiring tight voltage regulation and low EMI. IC Role / Device Role: Dual-output controller generating 3.3V for digital logic and 8.5V for analog front-end bias, operating continuously from 9V–16V battery with cold-crank tolerance. Use Value: 180° phase shift minimizes conducted EMI into sensitive RF sections; 50µA sleep IQ preserves battery during parking mode. |
Use Scenario: Providing isolated 5V and 24V rails for digital I/O and analog sensor excitation in modular programmable logic controllers. IC Role / Device Role: Primary DC/DC controller managing distributed 24V input to generate local 5V microcontroller supply and 24V field-side output drivers. Use Value: Wide 4V–60V input accommodates 24V nominal with brownout and surge; independent TRACK/SS pins enable synchronized startup with backplane power sequencing. |
| Battery-Powered Test Equipment | Telecom Remote Radio Unit |
|
Use Scenario: Portable oscilloscope or multimeter with Li-ion battery pack (8.4V–12.6V) powering mixed-signal ASICs, ADCs, and display backlight. IC Role / Device Role: High-efficiency dual controller delivering 3.3V for MCU/FPGA and 5V for analog front-end, with ultra-low IQ preserving runtime. Use Value: Burst Mode® operation achieves >85% efficiency at 100µA load; shutdown IQ <14µA prevents battery drain during storage. |
Use Scenario: Outdoor macrocell remote radio head powered from 48V PoE or telecom rectifier, requiring robust 3.3V/5V/12V rails with thermal resilience. IC Role / Device Role: Primary controller for baseband processor and RF transceiver power domains, operating in sealed enclosure with ambient up to 85°C. Use Value: +150°C junction rating ensures reliability under sustained thermal stress; phase-lockable frequency avoids beat frequencies with adjacent RF clocks. |
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 |
|---|---|---|---|
| LTC3890IUH-2#PBF | Same functionality but rated for –40°C to +125°C junction temperature; no AEC-Q100 qualification. | Suitable for industrial or commercial environments where automotive-grade reliability is not required. | Select when cost sensitivity outweighs automotive qualification needs and ambient temperature remains ≤125°C. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers; fixed 600kHz frequency; no EXTVCC support or PLL sync. | Lacks independent TRACK/SS, programmable frequency, and AEC-Q100 qualification; limited to ≤40V input. | Consider only for space-constrained non-automotive designs where integration outweighs flexibility and qualification requirements. |
Compared with LTC3890IUH-2#PBF and MP2918GL-Z, the LTC3890HUH-2#PBF uniquely combines AEC-Q100 Grade H qualification, 150°C operation, full feature parity (including PLL sync and EXTVCC), and proven ruggedness in automotive power rails - making it the only drop-in solution for under-hood dual-rail applications demanding both performance and compliance.
Availability
LTC3890HUH-2#PBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, battery-powered test equipment, and telecom remote radio units requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LTC3890HUH-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3890 family is designed specifically for high-reliability, wide-input-voltage dual-output DC/DC conversion in automotive and industrial environments - emphasizing low IQ, thermal resilience, and flexible control architecture.
FAQ
What is the maximum junction temperature rating for the LTC3890HUH-2#PBF?
The LTC3890HUH-2#PBF is specified for operation from –40°C to +150°C junction temperature and is AEC-Q100 Grade H qualified. This rating is validated through extended reliability testing and enables deployment in under-hood automotive locations such as engine control units and radar modules where ambient temperatures exceed 105°C.
How does the LTC3890HUH-2#PBF reduce input capacitor stress compared to single-phase controllers?
The LTC3890HUH-2#PBF drives its two output phases 180° out-of-phase, causing input ripple currents to partially cancel. This reduces RMS input capacitor current by up to 70%, allowing smaller, lower-ESR ceramic capacitors and lowering EMI filter requirements - a critical advantage in space-constrained automotive and industrial power supplies.
Can the LTC3890HUH-2#PBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC3890HUH-2#PBF supports external synchronization via the PLLIN/MODE pin. When an external clock is applied, the device locks its switching frequency to 75kHz–850kHz with phase alignment to the rising edge of that clock - enabling noise-sensitive systems (e.g., radar, audio) to avoid beat frequencies and meet strict EMI limits.
What are the three selectable light-load operating modes of the LTC3890HUH-2#PBF, and how are they configured?
The LTC3890HUH-2#PBF offers Burst Mode® (ground on PLLIN/MODE), pulse-skipping (1.2V–INTVCC–1.3V on PLLIN/MODE), and forced continuous conduction (INTVCC on PLLIN/MODE). Each mode optimizes efficiency vs. output ripple trade-offs: Burst Mode® delivers highest light-load efficiency; pulse-skipping balances ripple and efficiency; continuous mode ensures lowest noise for sensitive analog loads.
Does the LTC3890HUH-2#PBF support both RSENSE and DCR current sensing, and how is sensing accuracy maintained?
Yes, the LTC3890HUH-2#PBF supports both discrete sense resistors (RSENSE) and inductor DCR networks. Its differential SENSE+ and SENSE– inputs feature ±1µA bias current and 28V common-mode range, enabling accurate current measurement across wide temperature and voltage conditions - critical for maintaining overcurrent protection integrity in automotive and industrial applications.
LTC3890HUH-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890HUH-2#PBF FAQ
1.How can I place an order for LTC3890HUH-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890HUH-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 LTC3890HUH-2#PBF reliable?
The price and inventory of LTC3890HUH-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 LTC3890HUH-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890HUH-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890HUH-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890HUH-2#PBF?
LTC3890HUH-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890HUH-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 LTC3890HUH-2#PBF?
For technical support, including LTC3890HUH-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890HUH-2#PBF requirements.
6.How does Aetrix verify that LTC3890HUH-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890HUH-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 LTC3890HUH-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890HUH-2#PBF?
All LTC3890HUH-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890HUH-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 LTC3890HUH-2#PBF part is unused and in its original packaging.
Return procedure for LTC3890HUH-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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