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Analog Devices Inc. LTC3890EUH#PBF
- Part No.:
- LTC3890EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:736
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Product details
Overview
LTC3890EUH#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 adjustable VOUT, 50µA quiescent current (one channel active), and out-of-phase operation to reduce input ripple. It targets automotive always-on systems requiring high efficiency across wide VIN (4V–60V) and extended temperature (–40°C to 125°C).
For engineers reviewing the LTC3890EUH#PBF datasheet, LTC3890EUH#PBF pinout, LTC3890EUH#PBF application, or LTC3890EUH#PBF equivalent, key selection criteria include its dual-channel phase-lockable frequency (75kHz–850kHz), RSENSE/DCR current sensing, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and AEC-Q100 qualification for automotive reliability.
Technical Context
The LTC3890EUH#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.
Its dual gate drivers support high-side (TG1/TG2) and low-side (BG1/BG2) N-MOSFETs with 2.5Ω pull-up / 1.5Ω pull-down on TG and 2.4Ω / 1.1Ω on BG. The internal LDO powers INTVCC from VIN or EXTVCC (switchover at 4.7V), and the device includes output overvoltage protection, power-good monitoring, and no current foldback during start-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V (65V abs max); supports 12V/24V/48V battery and intermediate bus systems without external pre-regulation. |
| IQ (One Channel Active) | 50µA typical; enables >1000-hour runtime in battery-powered always-on applications like telematics or ADAS sensors. |
| VOUT Range | 0.8V to 24V; allows single-controller flexibility for core logic (0.8V), I/O (3.3V), and analog rails (8.5V, 12V). |
| Switching Frequency | 75kHz to 850kHz (phase-lockable); permits optimization of size vs. EMI-e.g., 400kHz for compact 2.2µH inductors or 150kHz for low-noise industrial sensors. |
| Current Sensing | RSENSE or DCR; eliminates need for dedicated sense resistors in high-current (>10A) power stages, reducing conduction loss and board area. |
| Duty Cycle Max | 99%; supports ultra-low dropout operation down to VOUT = 0.99 × VIN, critical for cold-crank 6V automotive scenarios. |
| Temp Grade | –40°C to 125°C junction; qualified per AEC-Q100 Grade 1, enabling use in engine bay or infotainment ECUs without derating. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN, 0.75mm profile, exposed thermal pad (Pin 33 = SGND) soldered to PCB ground for θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current comparator (–) input | Accepts common-mode up to 28V; supplies bias current when > INTVCC – 0.5V-enables accurate DCR sensing in high-side configurations. |
| FREQ (2) | VCO frequency control | 20µA internal pull-up sets frequency via resistor to GND (50–900kHz); direct tie to GND/INTVCC selects fixed 350/535kHz-no external clock needed for basic operation. |
| PLLIN/MODE (5) | Sync input & light-load mode selector | Accepts external clock (75–850kHz) for synchronization; logic level selects Burst Mode (GND), Pulse-Skipping (1.2–INTVCC–1.3V), or Continuous (INTVCC)-enables system-level EMI coordination. |
| TG1/TG2 (26, 15) | Top N-MOSFET gate drive | High-side floating driver with INTVCC-referenced swing; 25ns rise/fall into 3300pF-supports fast-switching GaN FETs without external level shifters. |
| PGOOD1/PGOOD2 (27, 14) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint; provides fault isolation for downstream processors or safety monitors in ASIL-B designs. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces input capacitor RMS current by ~30% and lowers conducted EMI peaks-enables smaller 10µF ceramic input banks instead of 47µF tantalum. |
| Selectably programmable light-load mode | Burst Mode achieves <10µA total system IQ at microamp loads; Pulse-Skipping maintains fixed frequency for predictable EMI; Continuous avoids audio-band noise in sensitive analog circuits. |
| Independent TRACK/SS pins | 1µA internal pull-up enables precise soft-start ramp time (tSS ≈ 0.8V × CSS / 1µA); resistor-divider tracking ensures coordinated rail sequencing in multi-voltage SoC power domains. |
| Output overvoltage protection | Hardware-based OVP triggers within 25µs when VFB exceeds regulated value by +13%, protecting downstream 3.3V/5V ICs without software intervention. |
| EXTVCC switchover LDO | Automatically switches INTVCC sourcing from VIN to an external 5V/8.5V rail (e.g., LTC3890's own 3.3V output), improving overall system efficiency by 2–3% in multi-rail converters. |
Applications
| Automotive Telematics Module | Industrial IoT Sensor Hub |
|---|---|
Use Scenario: Powering LTE modem, GPS receiver, and CAN transceiver in vehicle black box under cold-crank (6V) and load-dump (65V) conditions. IC Role / Device Role / Timing Role: Dual-channel controller generating isolated 3.3V (modem) and 8.5V (GPS LNA) rails with phase interleaving to meet CISPR-25 Class 5 conducted EMI limits. Use Value: 50µA IQ extends battery backup runtime to >72 hours; AEC-Q100 qualification ensures functional safety compliance without additional validation. |
Use Scenario: Supplying 3.3V MCU, 5V RS-485 transceiver, and 12V solenoid driver in battery-operated smart valve controller deployed in remote oil fields. IC Role / Device Role / Timing Role: Primary DC/DC controller managing wide-input (9–60V) solar/battery hybrid input while delivering tightly regulated, sequenced outputs. Use Value: 99% duty cycle enables operation down to 3.33V input for 3.3V output-critical during deep battery discharge; RSENSE sensing eliminates sense resistor losses in high-current solenoid path. |
| Medical Portable Monitor | Avionics Data Acquisition Unit |
Use Scenario: Powering ADC front-end, OLED display, and Bluetooth radio in handheld ECG device with strict low-noise and long-battery-life requirements. IC Role / Device Role / Timing Role: Dual-phase buck controller providing ultra-low-noise 3.3V (digital) and 5V (analog) rails using Burst Mode to suppress switching artifacts near sensitive analog signal paths. Use Value: OPTI-LOOP® compensation stabilizes loop with 100µF–1000µF output capacitors; PGOOD outputs trigger firmware-initiated shutdown before brownout affects data integrity. |
Use Scenario: Generating 28V avionics bus and 5V digital rail from 27–36V aircraft main bus in flight data recorder with DO-160E lightning surge immunity. IC Role / Device Role / Timing Role: High-voltage dual controller supporting 60V abs max input and integrated OVP to withstand induced transients without latch-up. Use Value: 65V absolute max rating exceeds DO-160E Section 22 surge test levels; independent RUN pins allow graceful degradation-e.g., disable non-critical 5V rail during transient events. |
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) | Integrated 60V/10A power stage per channel; no external MOSFETs required; lower IQ (25µA) but fixed 500kHz frequency only. | Suitable for space-constrained, medium-power (≤5A) designs where layout simplicity outweighs flexibility. | Choose MP8770GL-Z when BOM count reduction and faster design-in are priorities over programmable frequency and light-load mode selection. |
| LTC3891IUH#PBF (Analog Devices) | Single-channel variant with identical 4–60V range, 50µA IQ, and feature set; lacks second controller and phase-interleaving capability. | Used in cost-sensitive or lower-power applications needing only one regulated rail (e.g., 3.3V-only sensor node). | Choose LTC3891IUH#PBF when dual output is unnecessary and PCB area must be minimized-same footprint compatibility simplifies redesign. |
Compared with MP8770GL-Z and LTC3891IUH#PBF, the LTC3890EUH#PBF uniquely combines dual independent controllers, full frequency programmability, and three selectable light-load modes-making it optimal for high-reliability, multi-rail systems demanding both flexibility and automotive-grade robustness.
Availability
LTC3890EUH#PBF is available at Aetrix Electronics and suitable for automotive telematics, industrial IoT sensor hubs, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3890EUH#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 industrial, automotive, communications, and healthcare markets since 1965.
The LTC3890EUH#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, high-reliability DC/DC conversion in harsh environments-including automotive, aerospace, and industrial applications demanding wide VIN, low IQ, and AEC-Q100 compliance.
FAQ
What is the maximum input voltage rating for the LTC3890EUH#PBF?
The LTC3890EUH#PBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 4V to 60V. This allows safe operation across automotive battery transients including load dump (up to 65V) and cold-crank (down to 4V), making the LTC3890EUH#PBF suitable for under-hood applications without external clamping circuitry.
How does the LTC3890EUH#PBF achieve ultra-low quiescent current?
The LTC3890EUH#PBF achieves 50µA typical quiescent current (one channel active) through a dedicated low-power sleep mode, optimized bias networks, and automatic shutdown of unused internal blocks. When both channels are active in sleep mode, IQ remains ≤100µA; in full shutdown (RUN1/RUN2 < 0.7V), it drops to <14µA-enabling multi-year battery life in always-on automotive modules.
Can the LTC3890EUH#PBF synchronize to an external clock source?
Yes, the LTC3890EUH#PBF supports external synchronization via the PLLIN/MODE pin, accepting clock inputs from 75kHz to 850kHz. When an external clock is applied, the phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge-enabling deterministic EMI reduction and multi-phase coordination across distributed power systems using the LTC3890EUH#PBF.
What package type and thermal characteristics does the LTC3890EUH#PBF use?
The LTC3890EUH#PBF uses a 32-lead 5mm × 5mm plastic QFN package with 0.75mm height and an exposed thermal pad (Pin 33 = SGND). With proper PCB copper pour and thermal vias, it achieves θJA = 34°C/W, allowing continuous operation at 125°C junction temperature-verified per AEC-Q100 Grade 1 requirements for automotive under-hood deployment.
Does the LTC3890EUH#PBF support current sensing without a shunt resistor?
Yes, the LTC3890EUH#PBF supports DCR (inductor winding resistance) current sensing via differential inputs SENSE1+/SENSE1– and SENSE2+/SENSE2–. This eliminates the power loss and board area associated with discrete shunt resistors, especially beneficial in high-current (>5A) applications where efficiency and thermal management are critical-fully supported in the LTC3890EUH#PBF's current-mode control architecture.
LTC3890EUH#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)
LTC3890EUH#PBF FAQ
1.How can I place an order for LTC3890EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890EUH#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 LTC3890EUH#PBF reliable?
The price and inventory of LTC3890EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890EUH#PBF?
LTC3890EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890EUH#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 LTC3890EUH#PBF?
For technical support, including LTC3890EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890EUH#PBF requirements.
6.How does Aetrix verify that LTC3890EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890EUH#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 LTC3890EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890EUH#PBF?
All LTC3890EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890EUH#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 LTC3890EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3890EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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