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Analog Devices Inc. LTC3890EUH-2#PBF
- Part No.:
- LTC3890EUH-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890EUH-2#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:491
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Product details
Overview
LTC3890EUH-2#PBF from Analog Devices is a dual-phase, synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages for high-efficiency 8.5V/3.3V outputs. It operates from 4V to 60V input, delivers 0.8V–24V adjustable output voltage per channel, features 50µA quiescent current in single-channel sleep mode, and supports out-of-phase operation to reduce input ripple-ideal for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890EUH-2#PBF datasheet, LTC3890EUH-2#PBF pinout, LTC3890EUH-2#PBF application, or LTC3890EUH-2#PBF equivalent, key selection considerations include its AEC-Q100 qualification, dual-channel phase-lockable frequency (75–850kHz), selectable light-load modes (Burst Mode®, pulse-skipping, continuous), RSENSE/DCR current sensing, and 99% duty-cycle dropout capability.
Technical Context
The LTC3890EUH-2#PBF implements constant-frequency current-mode control with independent error amplifiers (ITH1/ITH2), dual differential current comparators (SENSE1±/SENSE2±), and programmable current limit via ILIM pin (GND/FLOAT/INTVCC). Its two controllers operate 180° out-of-phase by default, minimizing input capacitor RMS current and power supply noise.
It integrates dual gate drivers (TG1/BG1 and TG2/BG2) with 2.5Ω pull-up and 1.5Ω pull-down on TG, internal 5.1V INTVCC LDO powered from VIN or EXTVCC (switchover at 4.7V), and OPTI-LOOP® compensation supporting wide output capacitance/ESR ranges. The PLLIN/MODE pin enables external synchronization or selects light-load operating mode across both channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V industrial buses and wide-range battery chemistries including LiFePO₄ and lead-acid. |
| IQ (Sleep, 1 ch) | 50µA typical - extends runtime in always-on automotive modules and IoT edge nodes with intermittent load. |
| VOUT Range | 0.8V to 24V per channel - enables generation of logic rails (1.2V, 1.8V, 3.3V), analog supplies (5V, 8.5V), and intermediate bus voltages. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design while maintaining >90% efficiency at 3.3V/5A and 8.5V/3A. |
| Duty Cycle Max | 99% - sustains regulation during deep dropout (e.g., VIN = 4.2V → VOUT = 4.0V), critical for cold-crank automotive conditions. |
| Current Sensing | RSENSE or DCR - supports precision lossless inductor sensing or low-cost shunt-based current monitoring with ±1µA SENSE bias. |
| Temp Range | –40°C to +125°C junction - qualified per AEC-Q100 Grade E, suitable for under-hood and infotainment power supplies. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN, 0.75mm profile, exposed thermal pad (Pin 33 = SGND) requiring PCB soldering for thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Biased at INTVCC – 0.5V threshold; supplies current when active - enables ground-referenced DCR sensing without VFB dependency. |
| FREQ (2) | VCO frequency programming | 20µA internal pull-up sets oscillator frequency; resistor-to-GND programs 50–900kHz - eliminates need for external clock source in standalone designs. |
| PLLIN/MODE (5) | Sync input / light-load mode select | Accepts external clock (75–850kHz) for synchronization; logic level selects Burst Mode® (GND), pulse-skipping (1.2–INTVCC–1.3V), or forced CCM (INTVCC). |
| SGND (6, 33) | Small-signal reference ground | Must be routed separately from PGND and tied to CIN(–); exposed pad (33) is SGND - prevents noise coupling into feedback and current sense paths. |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Logic-controlled shutdown: <1.15V disables Channel 1; <1.20V disables Channel 2; both <0.7V enters ultra-low-IQ shutdown (<14µA). |
| INTVCC (19) | Internal LDO output | 5.1V ±3%, powers gate drivers and control circuitry; requires ≥4.7µF ceramic decoupling - enables self-powered operation from VIN or EXTVCC. |
| EXTVCC (20) | External LDO input | Switchover at 4.7V; bypasses VIN LDO to improve efficiency when powered from regulated 5V/8.5V rail - reduces heat in high-current applications. |
| TG1 / TG2 (26, 15) | Top N-MOSFET gate drive | Floating driver with INTVCC–0.5V swing referenced to SW node - supports bootstrap operation up to 65V VIN with integrated dropout recharging. |
| PGOOD1 / PGOOD2 (27, 14) | Open-drain power-good flag | Asserts low when VFB deviates >±10% from 0.8V setpoint - provides independent fault signaling for dual-rail sequencing and system monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade E (–40°C to +125°C) - validated for automotive powertrain, body electronics, and ADAS subsystems requiring zero-defect reliability. |
| Out-of-Phase Dual Control | Reduces input capacitor RMS current by ~30% vs in-phase operation - lowers required CIN size and cost in space-constrained layouts. |
| OPTI-LOOP® Compensation | Allows stable loop response across 10µF–1000µF output capacitance and 1mΩ–100mΩ ESR - simplifies design across diverse ceramic/polymer cap selections. |
| Selectably Programmable Light-Load Mode | Burst Mode® (50µA IQ), pulse-skipping, or forced CCM - enables optimal trade-off between efficiency, output ripple, and EMI in variable-load systems. |
| Independent TRACK/SS Pins | 1µA internal pull-up per pin - supports soft-start ramping or voltage tracking (e.g., 3.3V rail tracking 5V rail) without external circuitry. |
| DCR Current Sensing Support | Eliminates power loss and board area of shunt resistors - leverages inductor DCR for accurate, temperature-compensated current limiting in high-current converters. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC Dual-Rail Converter |
|---|---|
|
Use Scenario: Powers SoC core (1.2V), memory (1.8V), and interface (3.3V) rails from 12V vehicle battery with cold-crank tolerance down to 4.2V. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller delivering 3.3V/5A and 8.5V/3A with 180° phase shift and independent soft-start. Use Value: 99% duty cycle maintains regulation during cranking; AEC-Q100 qualification ensures reliability in harsh under-dash environments. |
Use Scenario: Generates isolated 5V logic and 24V I/O rails from 48V DC distribution bus in factory automation equipment. IC Role / Device Role / Timing Role: Dual-phase controller with programmable frequency (250kHz) and RSENSE/DCR sensing for precise current limiting. Use Value: Out-of-phase operation cuts input ripple by 40%, reducing EMI filter size; EXTVCC support enables efficient 5V rail powering of INTVCC. |
| Battery-Powered Test Equipment | Telecom Remote Radio Unit (RRU) |
|
Use Scenario: Powers FPGA, ADC, and RF front-end from Li-ion pack (8–26V) with ultra-low standby consumption. IC Role / Device Role / Timing Role: Dual-output controller operating in Burst Mode® at light loads, with independent RUN pin control for rail sequencing. Use Value: 50µA sleep IQ extends battery life >2× vs standard controllers; TRACK/SS pins enable synchronized startup of mixed-voltage subsystems. |
Use Scenario: Supplies 3.3V transceiver and 12V PA bias from -48V telecom rectified bus using intermediate 12V/24V stage. IC Role / Device Role / Timing Role: High-input-voltage (60V abs max) dual controller with phase-lockable frequency for EMI spread-spectrum compliance. Use Value: 60V input range accommodates -48V bus transients; PLLIN synchronization enables multi-converter coherence in dense RRU PCB layouts. |
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 |
|---|---|---|---|
| MP8770GQ-Z | Single-channel, 4V–60V, 500kHz fixed frequency, no phase-lock or out-of-phase capability | Lacks dual independent outputs and phase control - requires two ICs for same functionality | Consider only for cost-sensitive single-rail designs where dual-phase benefits are unnecessary |
| LTC3891EUH#PBF | Same family, but LTC3891-1 variant lacks ILIM pin and independent PGOOD outputs; no CLKOUT/PHASMD for PolyPhase® | Cannot configure three-level current limit or synchronize additional phases; reduced fault visibility | Use only if simplified current limit (fixed 50mV) and single PGOOD are acceptable for legacy designs |
Compared with MP8770GQ-Z and LTC3891EUH#PBF, the LTC3890EUH-2#PBF uniquely delivers dual independent 180°-out-of-phase channels, AEC-Q100 qualification, programmable current limit via ILIM, and full PolyPhase® synchronization - making it the sole choice for high-reliability, space-constrained dual-rail automotive and industrial converters.
Availability
LTC3890EUH-2#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3890EUH-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3890EUH-2#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, high-reliability DC/DC conversion in automotive and industrial environments demanding wide input range, low quiescent current, and robust fault protection.
FAQ
What is the maximum input voltage rating for the LTC3890EUH-2#PBF?
The LTC3890EUH-2#PBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 4V to 60V. This wide range supports 12V, 24V, and 48V industrial buses as well as automotive battery systems including cold-crank and load-dump conditions. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3890EUH-2#PBF support DCR current sensing?
Yes, the LTC3890EUH-2#PBF fully supports DCR current sensing on both channels via SENSE1± and SENSE2± pins. Its architecture does not require VFB to be below 0.65V for valid operation, enabling robust ground-referenced DCR networks without compromising regulation accuracy or stability - a key advantage over earlier controller generations.
How does the EXTVCC pin function on the LTC3890EUH-2#PBF?
The EXTVCC pin on the LTC3890EUH-2#PBF provides an alternative input to the internal 5.1V LDO that powers INTVCC. When EXTVCC exceeds 4.7V (with 250mV hysteresis), the VIN-powered LDO shuts off and the EXTVCC LDO activates - improving efficiency and reducing thermal load when powering INTVCC from a clean, regulated rail such as the LTC3890EUH-2#PBF's own 5V output.
Can the LTC3890EUH-2#PBF be synchronized to an external clock?
Yes, the LTC3890EUH-2#PBF supports external synchronization via the PLLIN/MODE pin. Applying a 75kHz–850kHz clock signal to this pin locks the rising edge of TG1 to the external clock's rising edge. During synchronization, light-load operation defaults to pulse-skipping mode - ensuring predictable timing and EMI behavior in multi-converter systems.
What is the purpose of the ILIM pin on the LTC3890EUH-2#PBF?
The ILIM pin on the LTC3890EUH-2#PBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = INTVCC), or 64mV (ILIM = FLOAT). This adjusts the peak inductor current trip point for both channels simultaneously, enabling flexible overcurrent protection scaling without changing sense resistor values - critical for optimizing thermal and efficiency trade-offs.
LTC3890EUH-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890EUH-2#PBF FAQ
1.How can I place an order for LTC3890EUH-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890EUH-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 LTC3890EUH-2#PBF reliable?
The price and inventory of LTC3890EUH-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 LTC3890EUH-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890EUH-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890EUH-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890EUH-2#PBF?
LTC3890EUH-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890EUH-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 LTC3890EUH-2#PBF?
For technical support, including LTC3890EUH-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890EUH-2#PBF requirements.
6.How does Aetrix verify that LTC3890EUH-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890EUH-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 LTC3890EUH-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890EUH-2#PBF?
All LTC3890EUH-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890EUH-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 LTC3890EUH-2#PBF part is unused and in its original packaging.
Return procedure for LTC3890EUH-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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