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Analog Devices Inc. LTC3890HUH#TRPBF
- Part No.:
- LTC3890HUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890HUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,594
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Product details
Overview
LTC3890HUH#TRPBF 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 reference accuracy, 50µA quiescent current (one channel active), and 99% duty cycle dropout capability - enabling high-efficiency power conversion in automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890HUH#TRPBF datasheet, LTC3890HUH#TRPBF pinout, LTC3890HUH#TRPBF application, or LTC3890HUH#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, out-of-phase dual-channel operation reducing input ripple, programmable frequency (50–900kHz), selectable light-load modes (Burst/Pulse-Skipping/Continuous), and integrated OPTI-LOOP® compensation for wide output capacitor ESR tolerance.
Technical Context
The LTC3890HUH#TRPBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize input capacitance requirements and supply-induced noise. Each channel features separate TRACK/SS pins for soft-start or voltage tracking, ITH-based current limit control, and dual sensing options (RSENSE or DCR).
Its internal 5.1V LDO powers gate drivers from VIN or EXTVCC (switchover at 4.7V), while the PLLIN/MODE pin selects light-load behavior - Burst Mode® (50µA IQ), pulse-skipping, or forced continuous conduction. The device supports phase-locking to external clocks (75–850kHz) and includes precision 0.8V feedback references with ±10% PGOOD monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V (65V abs max) - supports wide-input industrial and automotive battery chemistries including 12V, 24V, and 48V buses. |
| Quiescent Current | 50µA (one channel active) - extends runtime in battery-operated systems with long standby periods. |
| Feedback Reference | 0.800V ±1.0% (–40°C to 150°C) - enables precise output regulation across full automotive temperature range. |
| Switching Frequency | Programmable 50–900kHz or syncable 75–850kHz - allows optimization of size, efficiency, and EMI in space-constrained designs. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation essential for high-VIN-to-low-VOUT conversion (e.g., 48V→3.3V). |
| Output Voltage Range | 0.8V ≤ VOUT ≤ 24V per channel - accommodates diverse rail requirements without external amplification. |
| Current Sensing | RSENSE or DCR - provides flexibility in loss vs. cost trade-offs for current monitoring in high-current applications. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND), 0.75mm profile, rated for –40°C to +150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Supplies bias current when > INTVCC – 0.5V; enables accurate current foldback during short-circuit conditions. |
| FREQ (2) | VCO frequency programming | Resistor-to-GND sets 50–900kHz; direct tie to GND/INTVCC fixes 350/535kHz - simplifies frequency selection without external clock source. |
| PLLIN/MODE (5) | Sync input & light-load mode select | Accepts external clock (75–850kHz) or configures Burst/Pulse-Skipping/Continuous mode - critical for EMI-sensitive or low-power applications. |
| SGND (6, 33) | Small-signal ground reference | Must be routed separately from PGND to avoid noise coupling into error amplifier and current sense paths. |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Logic-level shutdown (≤1.16V/≤1.20V) with 7µA/0.5µA internal pull-up - supports flexible sequencing and always-on configurations. |
| TRACK/SS1 / TRACK/SS2 (29, 13) | Soft-start & tracking control | Internal 1µA pull-up charges external capacitor for linear ramp; also accepts resistor divider for output voltage tracking - ensures controlled startup in multi-rail systems. |
| PGOOD1 / PGOOD2 (27, 14) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint - provides system-level fault detection without additional supervision ICs. |
| ILIM (28) | Current limit threshold select | Tie to SGND/FLOAT/INTVCC to set max sense voltage to 22/43/64mV - allows scalable overcurrent protection matching MOSFET RDS(on) or sense resistor values. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified (H-grade) | Rated for –40°C to +150°C junction temperature - validated for under-hood automotive applications requiring high reliability. |
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~70% versus in-phase operation - cuts required input capacitance and lowers EMI filter cost/size. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of output capacitor types and ESR values - eliminates need for custom compensation networks. |
| Low dropout operation | 99% duty cycle with dropout detector recharging bootstrap caps - maintains regulation even when VIN approaches VOUT (e.g., 12V→11.5V). |
| Independent soft-start/tracking | Separate TRACK/SS pins per channel allow staggered startup or precise voltage sequencing - prevents bus contention in multi-supply systems. |
| Three light-load modes | Burst Mode® (50µA IQ), pulse-skipping, or forced continuous - lets designers optimize efficiency vs. output ripple based on real-time load demands. |
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) in head-unit ECUs. IC Role / Device Role / Timing Role: Primary dual-phase buck controller managing 8.5V intermediate bus and 3.3V system rail with precise sequencing. Use Value: AEC-Q100 H-grade rating ensures operation at 150°C junction temperature; out-of-phase switching reduces EMI to meet CISPR-25 Class 5 limits. |
Use Scenario: Distributed 24V-to-5V/3.3V conversion for isolated analog input/output channels in modular PLC backplanes. IC Role / Device Role / Timing Role: High-voltage input controller delivering tightly regulated rails with independent RUN pin control for channel-level power gating. Use Value: 60V input range accommodates 24V nominal with surge tolerance; low 50µA IQ extends uptime during brownout conditions. |
| Battery-Powered Test Equipment | Telecom Remote Radio Unit (RRU) |
Use Scenario: Portable oscilloscope or logic analyzer requiring clean 3.3V digital and 5V analog supplies from single Li-ion pack (3.0–4.2V). IC Role / Device Role / Timing Role: Dual-output buck controller using RSENSE sensing and Burst Mode® to maximize battery life during idle periods. Use Value: 50µA quiescent current doubles standby time versus typical 100–200µA controllers; 0.8V reference ensures <±1% output accuracy over temperature. |
Use Scenario: Powering FPGA, transceiver, and PA bias rails in outdoor 4G/5G RRUs powered from 48V PoE or solar-charged battery banks. IC Role / Device Role / Timing Role: High-efficiency dual-phase controller generating 12V intermediate bus and 3.3V logic rail with phase-locking to system clock. Use Value: Phase-lockable 75–850kHz operation enables deterministic EMI placement; EXTVCC support allows efficient self-bias from 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 |
|---|---|---|---|
| LTC3891IUH#TRPBF | Same pinout, identical functionality, but rated for –40°C to +125°C (I-grade) instead of +150°C (H-grade). | Suitable for non-automotive industrial applications where ambient temperature does not exceed 105°C. | Select when AEC-Q100 qualification and extended temperature operation are not required - lower cost and broader distributor availability. |
| MP8772GQ-10-Z | Single-channel 60V controller with integrated MOSFETs; no dual-phase or out-of-phase capability; 100µA IQ (vs. 50µA). | Applicable only where dual-rail generation is handled by separate ICs or where board area constraints favor monolithic solutions. | Choose when integration priority outweighs efficiency and ripple performance - requires two units to match LTC3890HUH#TRPBF's dual-channel function. |
Compared with LTC3891IUH#TRPBF, the LTC3890HUH#TRPBF offers guaranteed operation up to +150°C junction temperature and AEC-Q100 compliance for automotive use; compared with MP8772GQ-10-Z, it delivers superior input ripple reduction, lower quiescent current, and true dual-channel independence - making it optimal for high-reliability, thermally demanding, or EMI-sensitive dual-rail systems.
Availability
LTC3890HUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and battery-powered test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3890HUH#TRPBF 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 industrial, automotive, communications, and healthcare markets since 1965.
The LTC3890HUH#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for robust, high-efficiency power conversion in automotive and industrial environments with stringent thermal and reliability requirements.
FAQ
What is the maximum junction temperature specification for the LTC3890HUH#TRPBF?
The LTC3890HUH#TRPBF is rated for a maximum junction temperature of +150°C and is qualified per AEC-Q100 Grade H. This specification is explicitly confirmed in the Absolute Maximum Ratings table and supported by temperature-grade marking (HUH suffix). Operation beyond this limit risks permanent damage and violates the device's guaranteed performance envelope.
Does the LTC3890HUH#TRPBF support synchronization to an external clock source?
Yes, the LTC3890HUH#TRPBF supports external clock synchronization via the PLLIN/MODE pin, accepting input frequencies from 75kHz to 850kHz. When an external clock is applied, the internal phase-locked loop aligns the rising edge of TG1 with the rising edge of that clock - enabling deterministic EMI placement and multi-phase coherence in complex power systems.
How does the ILIM pin affect current limiting on the LTC3890HUH#TRPBF?
The ILIM pin on the LTC3890HUH#TRPBF selects one of three maximum current sense thresholds: 22mV (ILIM = SGND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This setting applies identically to both channels and directly determines the peak inductor current trip point - allowing scalable overcurrent protection matched to MOSFET RDS(on) or sense resistor values without external components.
Can the LTC3890HUH#TRPBF operate with only one channel enabled?
Yes, the LTC3890HUH#TRPBF supports independent channel control via RUN1 and RUN2 pins. Pulling RUN1 below 1.16V disables Channel 1 while leaving Channel 2 fully operational, and vice versa. In single-channel mode, quiescent current drops to 50µA - making it ideal for partial-load scenarios or redundant power architectures.
What is the purpose of the exposed thermal pad (Pin 33) on the LTC3890HUH#TRPBF package?
The exposed thermal pad (Pin 33) on the LTC3890HUH#TRPBF is electrically connected to SGND and must be soldered to a PCB ground plane to achieve specified thermal performance (θJA = 34°C/W). Failure to connect this pad results in excessive junction temperature rise, reduced reliability, and potential violation of the +150°C maximum rating - especially under sustained high-load conditions.
LTC3890HUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3890HUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890HUH#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3890HUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890HUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890HUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890HUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890HUH#TRPBF?
LTC3890HUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890HUH#TRPBF 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#TRPBF?
For technical support, including LTC3890HUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890HUH#TRPBF requirements.
6.How does Aetrix verify that LTC3890HUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890HUH#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890HUH#TRPBF?
All LTC3890HUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890HUH#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890HUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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