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Analog Devices Inc. LTC3890IUH-2#TRPBF
- Part No.:
- LTC3890IUH-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890IUH-2#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,305
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Product details
Overview
LTC3890IUH-2#TRPBF 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, achieves 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 LTC3890IUH-2#TRPBF datasheet, LTC3890IUH-2#TRPBF pinout, LTC3890IUH-2#TRPBF application, or LTC3890IUH-2#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, dual-channel phase-lockable frequency (75kHz–850kHz), selectable light-load modes (Burst Mode®, pulse-skipping, continuous), RSENSE/DCR sensing flexibility, and 99% duty-cycle dropout capability.
Technical Context
The LTC3890IUH-2#TRPBF implements a constant-frequency current-mode architecture with independent error amplifiers (ITH1/ITH2), dual differential current comparators (SENSE1+/−, SENSE2+/−), and OPTI-LOOP® compensation for wide output capacitance/ESR tolerance. Each channel features dedicated TRACK/SS pins for soft-start or voltage tracking, and PGOOD1/PGOOD2 open-drain monitors with ±10% trip hysteresis.
Its dual 180° out-of-phase switching minimizes input capacitor RMS current and power supply noise; the internal LDO powers gate drivers from VIN or EXTVCC (switchover at 4.7V), and the ILIM pin selects one of three current-sense thresholds (22mV/43mV/64mV) for both channels simultaneously.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports 12V/24V/48V battery buses and intermediate industrial rails without external pre-regulation. |
| Quiescent Current (Sleep) | 50µA (one channel active) - extends runtime in always-on automotive modules and portable instrumentation. |
| Output Voltage Range | 0.8V to 24V per channel - enables direct generation of logic, I/O, and analog supply rails from wide-input sources. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design across diverse load profiles. |
| Duty Cycle Max | 99% - sustains regulation during deep dropout (e.g., cold-crank 4.5V input with 3.3V output). |
| Current Sense Threshold | Selectable 22mV / 43mV / 64mV via ILIM pin - balances accuracy vs. power loss in RSENSE-based designs. |
| Operating Temp Range | –40°C to +125°C junction - qualified for under-hood automotive and industrial embedded environments. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND), 0.75mm profile - optimized for high-power density and thermal performance in space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current comparator (–) input | Supplies bias current when > INTVCC – 0.5V; enables ground-referenced DCR sensing without VFB dependency. |
| FREQ (2) | VCO frequency control | Resistor-to-GND sets 50–900kHz; GND = 350kHz, INTVCC = 535kHz - enables precise EMI management. |
| PHASMD (3) | Phase relationship selector | Configures TG2/CLKOUT phase offset vs TG1 (180°/240°/floating = 90°) for multi-phase synchronization. |
| PLLIN/MODE (5) | Sync input & light-load mode control | External clock sync or selects Burst Mode® (GND/floating), pulse-skipping (1.2V–INTVCC–1.3V), or forced CCM (INTVCC). |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Shuts down individual controller below 1.15V/1.20V; both < 0.7V enters 14µA shutdown - supports dynamic power partitioning. |
| TRACK/SS1 / TRACK/SS2 (13, 29) | Soft-start & voltage tracking input | Internal 1µA pull-up; capacitor-to-GND sets ramp time; resistor divider enables output tracking of external rail. |
| PGOOD1 / PGOOD2 (14, 27) | Open-drain power-good monitor | Asserts low when VFB deviates > ±10% from setpoint - provides reliable sequencing feedback for downstream logic. |
| ILIM (28) | Current limit threshold select | GND/FLOAT/INTVCC selects 22mV/64mV/43mV max sense voltage - simplifies current-limit tuning across variants. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Rated for automotive applications (–40°C to +125°C), including harsh environment reliability testing per stress test standard. |
| Out-of-phase dual controllers | Reduces input capacitor RMS current by ~30% and suppresses conducted EMI compared to in-phase operation. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of ceramic/POSCAP output capacitors and ESR values without redesign. |
| Low-noise 50µA sleep IQ | Extends battery life in always-on telematics, ADAS sensors, and infotainment standby modes without sacrificing wake-up speed. |
| Flexible current sensing | Supports both high-side RSENSE and low-side DCR networks - eliminates need for isolated sense amplifiers in cost-sensitive designs. |
| Dropout recovery circuit | Forces periodic top-FET off-time during 99% duty cycle to recharge bootstrap caps - ensures robust operation near VIN ≈ VOUT. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC (3.3V core) and display interface (8.5V backlight) in head-unit systems with 9–16V battery input and cold-crank survival. 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 and AEC-Q100 compliance. Use Value: 50µA sleep IQ preserves battery during vehicle-off; 60V abs max input withstands load-dump transients; PGOOD1/2 enable safe SoC reset sequencing. |
Use Scenario: Distributed 24V-to-3.3V/8.5V conversion in modular PLC backplanes where EMI and thermal density are critical. IC Role / Device Role / Timing Role: Dual-channel controller delivering regulated rails to FPGA I/O banks and analog signal conditioning circuits with phase-shifted switching. Use Value: Out-of-phase operation cuts input cap size by 40%; programmable frequency avoids sensitive 100/120Hz harmonics; RSENSE/DCR flexibility accommodates legacy board layouts. |
| Battery-Powered Test Equipment | Distributed Telecom Power |
Use Scenario: Portable oscilloscope or multimeter requiring ultra-low standby power and fast wake-up from deep sleep between measurements. IC Role / Device Role / Timing Role: Dual-output controller powering microcontroller (3.3V) and precision ADC reference (8.5V) from Li-ion (3.0–4.2V) or 12V sealed lead-acid. Use Value: 14µA shutdown IQ extends shelf life; selectable Burst Mode® maintains <15mV output ripple at µA loads; TRACK/SS enables synchronized rail ramp-up. |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying 3.3V control logic and 8.5V RF amplifier bias in base station remote radio units. IC Role / Device Role / Timing Role: High-voltage dual buck controller operating from 36–75V input with phase-lock to system clock for deterministic noise placement. Use Value: 850kHz sync capability aligns switching noise away from sensitive RF bands; EXTVCC option allows efficient self-bias from 3.3V rail; 125°C rating supports convection-cooled enclosures. |
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 |
|---|---|---|---|
| LTC3890EUH-2#TRPBF | Same silicon, commercial-grade (–40°C to +125°C), non-AEC-Q100 qualified | Suitable for industrial or consumer equipment without automotive reliability requirements | Select when AEC-Q100 is not mandated and cost sensitivity favors commercial grade. |
| LTC3890HUH-2#TRPBF | Same silicon, high-temp grade (–40°C to +150°C), AEC-Q100 qualified | Required for under-hood engine control modules or high-ambient industrial drives | Choose for extended temperature operation beyond 125°C junction, with full automotive qualification. |
Compared with LTC3890IUH-2#TRPBF, the EUH variant offers identical functionality at lower qualification cost for non-automotive use, while the HUH variant extends thermal margin and reinforces automotive compliance for extreme environments-neither is pin-compatible with non–LTC3890-2 family members due to ILIM/CLKOUT/PHASMD pin dependencies.
Availability
LTC3890IUH-2#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, battery-powered test equipment, and distributed telecom power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100 assurance.
Supply support for LTC3890IUH-2#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 since 1965.
The LTC3890 family is designed as high-voltage dual-phase synchronous buck controllers targeting automotive always-on systems and battery-operated digital devices demanding ultra-low quiescent current, wide input range, and robust transient response.
FAQ
What is the maximum input voltage rating for the LTC3890IUH-2#TRPBF?
The LTC3890IUH-2#TRPBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 4V to 60V. This allows direct connection to 48V industrial buses and automotive 12V/24V systems-including transient-tolerant operation during load dump events up to 65V without damage, provided external protection (e.g., TVS) is used per design guidelines.
Does the LTC3890IUH-2#TRPBF support external clock synchronization?
Yes, the LTC3890IUH-2#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop locks TG1's rising edge to the external clock's rising edge, enabling deterministic EMI placement and multi-controller coherence. The supported sync frequency range is 75kHz to 850kHz, matching its internal programmable range.
How does the ILIM pin affect current limiting on the LTC3890IUH-2#TRPBF?
The ILIM pin on the LTC3890IUH-2#TRPBF selects one of three fixed current-sense voltage thresholds-22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC)-for both channels simultaneously. This directly sets the peak inductor current trip point in conjunction with the RSENSE value, enabling consistent overcurrent protection scaling without recalculating sense resistors across variants.
Can the LTC3890IUH-2#TRPBF operate with only one channel enabled?
Yes, the LTC3890IUH-2#TRPBF supports independent channel control via RUN1 and RUN2 pins. Pulling RUN1 low disables Channel 1 while Channel 2 remains fully operational-and vice versa. In single-channel sleep mode, quiescent current drops to 50µA, making it ideal for asymmetric power architectures like hybrid SoC + peripheral rail systems.
What is the purpose of the exposed thermal pad (Pin 33) on the LTC3890IUH-2#TRPBF?
The exposed thermal pad (Pin 33) on the LTC3890IUH-2#TRPBF is electrically connected to SGND and must be soldered to a PCB copper pour for thermal and electrical integrity. It reduces θJA from 34°C/W to ≤20°C/W in typical layouts, enabling reliable operation at full load in +85°C ambient environments and preventing thermal shutdown during sustained 5A/3A dual-channel output conditions.
LTC3890IUH-2#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, 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)
LTC3890IUH-2#TRPBF FAQ
1.How can I place an order for LTC3890IUH-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890IUH-2#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 LTC3890IUH-2#TRPBF reliable?
The price and inventory of LTC3890IUH-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890IUH-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890IUH-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890IUH-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890IUH-2#TRPBF?
LTC3890IUH-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890IUH-2#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 LTC3890IUH-2#TRPBF?
For technical support, including LTC3890IUH-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890IUH-2#TRPBF requirements.
6.How does Aetrix verify that LTC3890IUH-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890IUH-2#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 LTC3890IUH-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890IUH-2#TRPBF?
All LTC3890IUH-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890IUH-2#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 LTC3890IUH-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890IUH-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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