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Analog Devices Inc. LTC3890EUH#TRPBF
- Part No.:
- LTC3890EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,741
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Product details
Overview
LTC3890EUH#TRPBF from Analog Devices is a dual-phase, synchronous step-down DC/DC controller designed for high-efficiency power conversion in automotive and industrial systems. It supports 4V–60V input, delivers two independent outputs (0.8V–24V), operates with 50µA quiescent current in single-channel sleep mode, and features out-of-phase operation to reduce input ripple. It is used in battery-powered digital devices requiring stable low-IQ regulation.
For engineers reviewing the LTC3890EUH#TRPBF datasheet, LTC3890EUH#TRPBF pinout, LTC3890EUH#TRPBF application, or LTC3890EUH#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, dual-channel phase-lockable frequency (75kHz–850kHz), RSENSE/DCR sensing flexibility, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and 99% duty-cycle dropout capability.
Technical Context
The LTC3890EUH#TRPBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize input capacitor RMS current and system noise. Each channel uses a transconductance error amplifier (2 mmho) and precision 0.8V reference (±1.2 mV over temperature) to regulate output voltage via external resistor dividers connected to VFB1/VFB2.
It integrates dual N-channel MOSFET gate drivers (TG/BG) with 2.5Ω pull-up and 1.5Ω pull-down on TG, 2.4Ω/1.1Ω on BG, and supports bootstrap operation up to 71V on BOOST pins. The internal INTVCC LDO delivers 5.1V ±2.5% from VIN or EXTVCC (switchover at 4.7V), enabling efficient self-powering from regulated outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide battery chemistries (12V/24V/48V systems) and intermediate bus voltages without external pre-regulation. |
| IQ (Sleep, 1 ch) | 50 µA - extends runtime in always-on automotive modules and portable equipment with standby power budgets under 100 µW. |
| VOUT Range | 0.8V to 24V - enables direct generation of logic rails (3.3V, 5V), analog supplies (8.5V), and higher-voltage subsystems from single input. |
| Switching Frequency | 75 kHz to 850 kHz - programmable via FREQ pin resistor or PLL-synchronized externally; allows optimization of size (high f) vs. efficiency (low f). |
| Duty Cycle Max | 99% - supports ultra-low dropout operation (e.g., 12V→11.5V), critical for maintaining regulation during cold-crank or brownout conditions. |
| Current Sensing | RSENSE or DCR - eliminates need for dedicated sense resistors in high-current designs, reducing conduction loss and board space. |
| Light-Load Mode | Selectable Burst Mode®, Pulse-Skipping, or Continuous - enables >90% efficiency down to 100 µA load while suppressing audible noise and EMI. |
Pinout & Package
32-lead (5mm × 5mm) plastic QFN package with exposed thermal pad (Pin 33 = SGND), 0.75mm profile, RoHS-compliant, rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Accepts common-mode voltage up to 28V; supplies bias current when > INTVCC – 0.5V, enabling accurate DCR sensing across wide input range. |
| FREQ (2) | VCO frequency control | 20 µA internal pull-up sets oscillator frequency; resistor to GND programs 50–900 kHz; direct tie to GND/INTVCC selects fixed 350/535 kHz. |
| PLLIN/MODE (5) | Sync input & light-load mode select | Accepts external clock for phase-locking; voltage level (GND/INTVCC/1.2–INTVCC–1.3V) selects Burst/Pulse-Skipping/Continuous mode per both channels. |
| TG1/TG2 (26, 15) | Top N-MOS gate drive outputs | Float relative to SW nodes; swing = INTVCC – 0.5V superimposed on SW; drives external high-side MOSFETs with 2.5Ω pull-up. |
| PGOOD1/PGOOD2 (27, 14) | Open-drain power-good indicators | Assert low when VFB deviates >±10% from setpoint; includes 2.5% hysteresis and 25 µs fault reporting delay for reliable sequencing. |
| TRACK/SS1/SS2 (29, 13) | Soft-start & tracking control | Internal 1 µA pull-up charges external capacitor for linear ramp; also accepts external divider for supply tracking during startup. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces required input capacitance by ~50% and cuts power supply-induced noise on shared rails in multi-rail systems. |
| OPTI-LOOP® compensation | Enables stable loop response across wide ranges of output capacitance (10 µF–1000 µF) and ESR (0.5 mΩ–100 mΩ) without redesign. |
| AEC-Q100 Grade E qualification | Validated for automotive applications including infotainment, ADAS sensors, and body electronics with full temperature and reliability testing. |
| No current foldback at startup | Prevents MOSFET thermal stress during short-circuit conditions by limiting peak current without reducing average current during soft-start. |
| Independent RUN/SS per channel | Allows staggered enable/disable and custom soft-start timing for each output-essential for FPGA, DSP, or multi-core SoC power sequencing. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for head unit MCU (3.3V), display backlight driver (8.5V), and audio codec (5V) in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent 3.3V/5A and 8.5V/3A outputs with out-of-phase switching to suppress EMI in EMC-sensitive cabin environment. Use Value: 50 µA quiescent current meets ISO 16750-2 "parking mode" requirements; AEC-Q100 qualification ensures reliability across –40°C to +125°C ambient. | Use Scenario: Distributed 24V-to-5V/3.3V conversion for isolated digital I/O channels in factory automation controller with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency dual controller delivering regulated rails from unregulated 24V field bus, using DCR sensing to eliminate sense resistor losses in high-current paths. Use Value: 99% duty cycle maintains regulation during 24V brownouts; programmable frequency avoids noise coupling into analog sensor front-ends. |
| Battery-Powered Test Equipment | Distributed Telecom DC System |
Use Scenario: Portable oscilloscope or signal generator requiring low-noise 3.3V logic rail and clean 12V analog supply from Li-ion pack (8.4V–12.6V). IC Role / Device Role / Timing Role: Dual-output controller operating in Burst Mode at light loads to extend battery life, with independent TRACK/SS pins enabling synchronized soft-start of analog/digital domains. Use Value: 50 µA sleep IQ doubles runtime versus typical 100–200 µA controllers; OPTI-LOOP® simplifies compensation for varying load capacitance across modular test heads. | Use Scenario: Intermediate bus converter in 48V telecom shelf supplying multiple point-of-load regulators for baseband processing and RF modules. IC Role / Device Role / Timing Role: Primary 48V-to-12V/5V dual-phase controller driving paralleled MOSFETs, synchronized via CLKOUT to adjacent LTC3890s for 6-phase interleaving. Use Value: Phase-lockable frequency enables precise interleaving to reduce input/output ripple; 60V absolute max rating accommodates 48V transient surges per IEEE C62.41. |
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 | Single-output, 60V, 50µA IQ, same package - lacks second channel and phase synchronization capability. | Suitable only for single-rail systems; cannot replace LTC3890EUH#TRPBF in dual-output or interleaved designs. | Select when only one regulated output is needed and board space must be minimized. |
| MP8770GQ-Z | 60V dual-phase controller, 65µA IQ, 5mm×5mm QFN - no AEC-Q100 qualification, no PLL sync, fixed 500kHz frequency only. | Targeted at cost-sensitive industrial/commercial use; not approved for automotive safety-critical functions. | Choose for non-automotive applications where qualification and flexible frequency are secondary to BOM cost. |
Compared with LTC3891IUH#TRPBF and MP8770GQ-Z, the LTC3890EUH#TRPBF uniquely combines dual independent outputs, AEC-Q100 qualification, full phase-lock capability, and selectable light-load modes - making it the only option for automotive dual-rail systems requiring robustness, noise control, and extended battery runtime.
Availability
LTC3890EUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and battery-operated test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3890EUH#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3890EUH#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC controllers, engineered specifically for demanding automotive and industrial power conversion where wide input range, ultra-low quiescent current, and AEC-Q100 reliability are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3890EUH#TRPBF?
The LTC3890EUH#TRPBF has an absolute maximum input supply voltage (VIN) rating of 65V, with a recommended operating range of 4V to 60V. This allows safe operation across automotive battery transients (e.g., ISO 7637-2 pulse 5a) and industrial 48V systems. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3890EUH#TRPBF support phase synchronization with external clocks?
Yes, the LTC3890EUH#TRPBF supports full phase-lock synchronization via its PLLIN/MODE pin. When an external clock is applied, the internal phase-locked loop aligns the rising edge of TG1 to that clock's rising edge, enabling precise interleaving across multiple controllers. Frequency lock range is 75kHz to 850kHz, verified in production testing.
How does the LTC3890EUH#TRPBF achieve 50µA quiescent current?
The LTC3890EUH#TRPBF achieves 50µA quiescent current in single-channel sleep mode through integrated low-power circuitry: a 20µA FREQ pin pull-up, 1µA TRACK/SS pull-up, and optimized bias networks in its current-mode control loop. This value is measured per Electrical Characteristics table (Rev. D, p.3) with one channel enabled and no load, meeting AEC-Q100 low-power requirements.
Can the LTC3890EUH#TRPBF operate with only one output active?
Yes, the LTC3890EUH#TRPBF supports independent channel control: RUN1 and RUN2 pins allow individual enable/disable of each controller. With RUN2 grounded and RUN1 pulled high, only Channel 1 operates - drawing 50µA IQ and delivering full functionality (soft-start, PGOOD, current limit) for its output, while Channel 2 remains fully disabled.
What package type and thermal characteristics does the LTC3890EUH#TRPBF use?
The LTC3890EUH#TRPBF uses a 32-lead 5mm × 5mm plastic QFN (UH package) with exposed thermal pad (Pin 33 = SGND). Its thermal resistance is θJA = 34°C/W when properly soldered to a 4-layer PCB with 1-in² copper pour under the pad, enabling operation up to +125°C junction temperature per datasheet specifications.
LTC3890EUH#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890EUH#TRPBF FAQ
1.How can I place an order for LTC3890EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890EUH#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 LTC3890EUH#TRPBF reliable?
The price and inventory of LTC3890EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890EUH#TRPBF?
LTC3890EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890EUH#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 LTC3890EUH#TRPBF?
For technical support, including LTC3890EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3890EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890EUH#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 LTC3890EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890EUH#TRPBF?
All LTC3890EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890EUH#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 LTC3890EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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