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Analog Devices Inc. LTC3890IUH#PBF
- Part No.:
- LTC3890IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890IUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:296
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Product details
Overview
LTC3890IUH#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 8.5V/3.3V outputs with 0.8V–24V programmable VOUT, 50µA quiescent current (one channel active), and out-of-phase operation to reduce input ripple. It serves automotive always-on systems requiring high efficiency across wide VIN (4V–60V) and extended temperature (–40°C to 125°C).
For engineers reviewing the LTC3890IUH#PBF datasheet, LTC3890IUH#PBF pinout, LTC3890IUH#PBF application, or LTC3890IUH#PBF equivalent, key selection criteria include dual-channel phase control, RSENSE/DCR current sensing, selectable light-load modes (Burst/Pulse-Skipping/CCM), 75kHz–850kHz PLL-synchronizable frequency, and AEC-Q100 qualification for automotive reliability.
Technical Context
The LTC3890IUH#PBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize input capacitor RMS current and power supply noise. Each channel features OPTI-LOOP® compensation, precision 0.8V reference (±1.2mV over temp), and independent TRACK/SS pins enabling soft-start or voltage tracking.
It integrates dual gate drivers (TG/BG) with <2.5Ω on-resistance, internal 5.1V LDO (INTVCC) powered from VIN or EXTVCC (switchover at 4.7V), and robust protection including output overvoltage detection, power-good monitoring, and current foldback during short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V battery systems and intermediate bus rails without external pre-regulation. |
| IQ (One Channel Active) | 50µA - enables multi-week battery runtime in always-on automotive modules. |
| VOUT Range | 0.8V to 24V - accommodates core logic (0.8V), I/O (3.3V), analog (5V), and higher-voltage peripherals (8.5V, 12V). |
| Switching Frequency | 75kHz to 850kHz (PLL-synchronizable) - allows EMI optimization and inductor size reduction while maintaining stability. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation (e.g., 12V→11.5V) without losing regulation. |
| Current Sensing | RSENSE or DCR - eliminates sense resistor losses in high-current designs via inductor DCR sensing. |
| Temp Grade | –40°C to 125°C - qualified per AEC-Q100 Grade I for under-hood automotive applications. |
Pinout & Package
32-lead (5mm × 5mm) plastic QFN package with exposed thermal pad (Pin 33 = SGND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current comparator (–) input | Accepts common-mode voltage up to 28V; supplies bias current when > INTVCC – 0.5V for accurate DCR/RSENSE sensing. |
| FREQ (2) | VCO frequency programming | Resistor-to-GND sets 50–900kHz fixed frequency; direct tie to GND/INTVCC selects 350/535kHz. |
| PHASMD (3) | Phase relationship selector | Configures TG2/CLKOUT phase offset vs TG1 (180°/240°/floating default 180°) for optimal multi-phase interleaving. |
| PLLIN/MODE (5) | Synchronization & light-load mode control | Accepts external clock (75–850kHz) for synchronization; selects Burst Mode (GND/floating), Pulse-Skipping (1.2–INTVCC–1.3V), or CCM (INTVCC). |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Shuts down individual controller below 1.15V/1.20V; full shutdown (<0.7V both) reduces IQ to <14µA. |
| TRACK/SS1 / TRACK/SS2 (13, 29) | Soft-start & output tracking input | Internal 1µA pull-up charges external capacitor for linear ramp; accepts external divider for supply tracking. |
| PGOOD1 / PGOOD2 (14, 27) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint; includes 2.5% hysteresis for noise immunity. |
| ILIM (28) | Current limit threshold select | Three levels (GND/FLOAT/INTVCC) set max sense voltage to 22/43/64mV - scales current limit without resistor changes. |
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. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of output capacitors (including low-ESR ceramic) without external compensation tuning. |
| Selectably configurable light-load mode | Burst Mode achieves >85% efficiency at 1mA load; Pulse-Skipping maintains fixed frequency; CCM ensures low output ripple. |
| Integrated dual gate drivers | TG/BG drivers deliver <2.5Ω on-resistance and <30ns transition times - supports high-efficiency Si/SiC MOSFETs up to 5MHz switching. |
| AEC-Q100 Grade I qualification | Validated for automotive use with guaranteed operation from –40°C to 125°C junction temperature and robust HBM/CDM ESD protection. |
| Dropout detector & forced refresh | Prevents bootstrap capacitor depletion during 99% duty cycle operation by forcing periodic bottom-FET turn-on for CB recharge. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC (1.1V core), DDR memory (1.2V), and display interface (3.3V/5V) in head-unit ECUs. IC Role / Device Role / Timing Role: Primary dual-output buck controller managing sequencing, load transient response, and thermal management. Use Value: Out-of-phase operation minimizes input ripple on shared 12V battery rail; 50µA IQ extends sleep-mode battery life. |
Use Scenario: Distributed 24V-to-5V/3.3V conversion for sensor signal conditioning, isolated communication interfaces, and microcontroller power in factory automation hardware. IC Role / Device Role / Timing Role: High-reliability DC/DC controller supporting wide input transients (load dump, cold crank) and long-term industrial temperature stability. Use Value: 60V absolute max rating withstands 48V bus surges; AEC-Q100 qualification ensures field reliability beyond standard industrial specs. |
| Battery-Powered Test Equipment | Telecom Remote Radio Unit (RRU) |
Use Scenario: Portable oscilloscope or multimeter requiring low-noise analog rails (±5V, 3.3V) and efficient battery utilization over 8+ hour runtime. IC Role / Device Role / Timing Role: Dual-channel controller delivering regulated outputs with precise soft-start and independent enable for subsystem power gating. Use Value: Selectable Burst Mode maintains >90% efficiency at µA loads; TRACK/SS pins enable controlled power-up sequencing to avoid inrush faults. |
Use Scenario: 48V backplane-to-12V/5V conversion in outdoor wireless base station RRUs operating in uncontrolled ambient temperatures. IC Role / Device Role / Timing Role: High-efficiency, thermally robust controller handling wide input variation (36–72V) and high ambient heat dissipation. Use Value: 125°C junction rating and 34°C/W θJA support operation in sealed enclosures; EXTVCC option enables self-powered INTVCC from local 12V rail. |
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 |
|---|---|---|---|
| MP8770GL-Z (Monolithic Power) | Single-chip dual-output converter (integrated MOSFETs); max VIN = 36V; no PLL sync; 100µA IQ. | Lower BOM count for <10A total output; unsuitable for 48V+ inputs or strict EMI-controlled systems requiring phase sync. | Choose MP8770GL-Z for cost-sensitive, space-constrained designs with ≤36V input and moderate efficiency requirements. |
| LTC3891IUH#PBF (Analog Devices) | Pin-compatible upgrade with enhanced current-mode accuracy, lower IQ (35µA), and improved VFB tolerance (±0.5%). | Same footprint and function; superior light-load efficiency and tighter output regulation for precision analog systems. | Choose LTC3891IUH#PBF when upgrading existing LTC3890 designs for improved accuracy, lower standby power, or tighter VOUT tolerance. |
Compared with MP8770GL-Z, LTC3890IUH#PBF offers higher input voltage capability, PLL synchronization, and lower quiescent current-critical for automotive and telecom infrastructure. Compared with LTC3891IUH#PBF, it provides proven field reliability at slightly relaxed specifications, making it ideal for cost-optimized production programs where the upgraded features are not required.
Availability
LTC3890IUH#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and battery-powered test equipment requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for LTC3890IUH#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 LTC3890IUH#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, high-reliability DC/DC conversion in harsh environments-including automotive under-hood, industrial automation, and telecom infrastructure.
FAQ
What is the maximum input voltage rating for the LTC3890IUH#PBF?
The LTC3890IUH#PBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 4V to 60V. This allows reliable operation across 12V, 24V, and 48V battery systems, including automotive load-dump transients up to 60V sustained. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3890IUH#PBF support synchronization to an external clock source?
Yes, the LTC3890IUH#PBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal (75kHz–850kHz) is applied, the internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge-enabling deterministic timing across multiple converters in dense power systems.
How does the LTC3890IUH#PBF achieve low quiescent current in automotive always-on applications?
The LTC3890IUH#PBF achieves 50µA quiescent current with one channel active and <14µA in full shutdown by integrating ultra-low-power bias circuits, optimized gate driver architecture, and intelligent sleep-state management. Its AEC-Q100 qualification ensures this performance is maintained across –40°C to 125°C, extending battery life in vehicle telematics and ADAS modules.
Can the LTC3890IUH#PBF drive both N-channel MOSFETs in a synchronous buck stage?
Yes, the LTC3890IUH#PBF integrates dual high-current gate drivers (TG1/TG2 and BG1/BG2) specifically designed to drive external N-channel MOSFETs in synchronous buck topologies. TG outputs operate as floating drivers referenced to SW nodes, while BG outputs swing from PGND to INTVCC-enabling efficient, high-side/lower-side N-MOS control without external level shifters.
What is the purpose of the EXTVCC pin on the LTC3890IUH#PBF?
The EXTVCC pin on the LTC3890IUH#PBF allows the internal 5.1V INTVCC regulator to be powered from an external supply (e.g., one of the LTC3890IUH#PBF's own output rails) instead of VIN. When EXTVCC exceeds 4.7V, the VIN-based LDO shuts off and the EXTVCC-based LDO activates-improving overall system efficiency by avoiding VIN-to-5.1V linear regulation losses.
LTC3890IUH#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890IUH#PBF FAQ
1.How can I place an order for LTC3890IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890IUH#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#PBF reliable?
The price and inventory of LTC3890IUH#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890IUH#PBF?
LTC3890IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890IUH#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#PBF?
For technical support, including LTC3890IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890IUH#PBF requirements.
6.How does Aetrix verify that LTC3890IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890IUH#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890IUH#PBF?
All LTC3890IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890IUH#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#PBF part is unused and in its original packaging.
Return procedure for LTC3890IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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