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Analog Devices Inc. LTC3890IUH#TRPBF
- Part No.:
- LTC3890IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,951
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Product details
Overview
LTC3890IUH#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–24V adjustable range, 50µA quiescent current (one channel active), and out-of-phase operation to reduce input ripple. Used in automotive always-on systems requiring high efficiency at light loads.
For engineers reviewing the LTC3890IUH#TRPBF datasheet, LTC3890IUH#TRPBF pinout, LTC3890IUH#TRPBF application, or LTC3890IUH#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, dual-channel phase-lockable frequency (75–850kHz), RSENSE/DCR sensing flexibility, and selectable Burst Mode®/pulse-skipping/continuous operation for battery-sensitive designs.
Technical Context
The LTC3890IUH#TRPBF 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%), and independent TRACK/SS pins for soft-start or voltage tracking.
It supports three light-load modes via PLLIN/MODE pin: Burst Mode® (50µA IQ), pulse-skipping, or forced continuous conduction. Current sensing uses differential SENSE+/- inputs with programmable thresholds (22–85mV) set by ILIM pin state (GND/FLOAT/INTVCC), and includes output overvoltage protection and 99% dropout duty cycle capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V (65V absolute max); supports wide battery chemistries and intermediate bus voltages. |
| Quiescent Current | 50µA (one channel active); extends runtime in always-on automotive systems. |
| Output Voltage Range | 0.8V ≤ VOUT ≤ 24V; enables flexible dual-rail generation (e.g., 8.5V + 3.3V). |
| Switching Frequency | 75kHz–850kHz (phase-lockable); allows EMI optimization and compact magnetics. |
| Current Sensing | RSENSE or DCR; supports low-loss, high-accuracy inductor current monitoring. |
| Operating Temp | –40°C to +125°C junction; qualified per AEC-Q100 Grade I for automotive under-hood use. |
| Package | 32-lead 5mm × 5mm QFN (UH); 0.75mm profile enables space-constrained PCB layouts. |
Pinout & Package
32-lead (5mm × 5mm) plastic QFN package with exposed pad (Pin 33 = SGND), rated for –40°C to +125°C operating junction temperature. Exposed pad must be soldered to PCB ground for thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Biases comparator; supplies current when > INTVCC – 0.5V; enables accurate DCR/RSENSE sensing. |
| FREQ (2) | VCO frequency control | Resistor-to-GND sets 50–900kHz; GND = 350kHz, INTVCC = 535kHz; internal 20µA pull-up. |
| PLLIN/MODE (5) | Sync input / light-load mode select | External clock sync; GND = Burst Mode®, INTVCC = continuous, mid-voltage = pulse-skipping. |
| SGND (6, 33) | Small-signal ground | Common reference for analog circuitry; exposed pad (33) must be soldered to PCB ground plane. |
| RUN1 / RUN2 (7, 8) | Independent enable control | Below 1.15V/1.20V disables respective channel; both < 0.7V shuts down entire IC (IQ < 14µA). |
| INTVCC (19) | Internal LDO output | 5.1V ±2.5% regulated supply for gate drivers and logic; requires ≥4.7µF ceramic decoupling. |
| EXTVCC (20) | External bias input | Bypasses VIN LDO when > 4.7V; enables efficient self-bias from output rails (e.g., 8.5V rail). |
| PGOOD1 / PGOOD2 (14, 27) | Open-drain power-good indicator | Asserts low when VFB deviates > ±10% from setpoint; supports system sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces required input capacitance by ~50% and lowers RMS input ripple current in multi-phase systems. |
| OPTI-LOOP® compensation | Enables stable loop response across wide output capacitor ESR and capacitance ranges without external tuning. |
| Programmable current limit | Three threshold options (22/43/64mV) via ILIM pin (GND/FLOAT/INTVCC); prevents MOSFET overstress during short-circuit. |
| Adjustable soft-start/tracking | Independent TRACK/SS1/SS2 pins with 1µA internal pull-up; supports capacitor ramp or resistor-divider tracking of external supplies. |
| AEC-Q100 qualification | Grade I (–40°C to +125°C) qualification ensures reliability in automotive always-on applications including infotainment and ADAS power rails. |
Applications
| Automotive Infotainment Power | Industrial IoT Edge Node |
|---|---|
Use Scenario: Dual-rail power for SoC, DDR memory, and display interface in vehicle head units. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller generating isolated 8.5V (analog/audio) and 3.3V (digital logic) rails. Use Value: Out-of-phase operation minimizes input ripple on shared 12V battery bus; 50µA IQ preserves battery life during sleep mode. |
Use Scenario: Battery-powered sensor gateway with long-term field deployment and intermittent wireless transmission. IC Role / Device Role / Timing Role: High-efficiency dual-output DC/DC controller powering MCU core (3.3V) and RF transceiver (8.5V). Use Value: Burst Mode® operation achieves >85% efficiency at 100µA load; AEC-Q100 qualification ensures robustness in harsh environments. |
| Distributed Telecom Power | Medical Portable Diagnostic Device |
Use Scenario: Intermediate bus conversion in compact base station modules requiring multiple isolated voltage rails. IC Role / Device Role / Timing Role: Dual-channel controller stepping 48V intermediate bus down to 8.5V (power amplifier bias) and 3.3V (control logic). Use Value: Phase-lockable frequency enables synchronization with system clock to suppress beat frequencies; 60V VIN withstands telecom surge transients. |
Use Scenario: Portable ultrasound or glucose monitor requiring ultra-low-noise, long-life battery operation. IC Role / Device Role / Timing Role: Dual-output controller delivering clean 3.3V (ADC/DAC) and 8.5V (transducer bias) from single Li-ion cell (3.0–4.2V) with boost-capable front-end. Use Value: Very low dropout (99% duty cycle) maintains regulation as battery depletes; independent soft-start prevents inrush into sensitive analog circuits. |
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 version; identical pinout and feature set except second channel removed. | Suitable only for single-rail designs; lacks dual independent TRACK/SS and PGOOD outputs. | Select when only one regulated output is needed and board layout reuse is critical. |
| MPQ8645PGU-AEC1-Z | Monolithic dual buck (integrated MOSFETs); 4.5–60V input; 500kHz fixed freq; no phase-lock or DCR sensing. | Lower BOM count but limited to 5A/channel; no RSENSE option or programmable light-load modes. | Choose for cost-sensitive, lower-current (<5A) automotive applications where integration outweighs flexibility. |
Compared with LTC3890IUH#TRPBF, LTC3891IUH#TRPBF reduces channel count while retaining identical thermal and timing behavior, whereas MPQ8645PGU-AEC1-Z trades external MOSFET flexibility and advanced light-load control for monolithic simplicity and smaller footprint.
Availability
LTC3890IUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial IoT edge nodes, and distributed telecom power systems requiring stable component supply, AEC-Q100 compliance, and dual-rail synchronous buck control.
Supply support for LTC3890IUH#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.
The LTC3890IUH#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, high-reliability DC/DC conversion in automotive and industrial applications demanding wide input range and ultra-low quiescent current.
FAQ
What is the maximum input voltage rating for the LTC3890IUH#TRPBF?
The LTC3890IUH#TRPBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 4V to 60V. This wide range accommodates 12V, 24V, and 48V battery systems and intermediate bus architectures. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
How does the LTC3890IUH#TRPBF achieve ultra-low quiescent current?
The LTC3890IUH#TRPBF achieves 50µA quiescent current (one channel active) through optimized biasing of internal regulators and shutdown logic. In Sleep Mode, unused circuitry is gated, and the INTVCC LDO operates at minimal current. Shutdown (both RUN pins < 0.7V) reduces IQ to <14µA, critical for automotive always-on systems.
Can the LTC3890IUH#TRPBF synchronize to an external clock?
Yes - the LTC3890IUH#TRPBF supports external synchronization via the PLLIN/MODE pin. When an external clock is applied, the internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge. This enables precise timing coordination across multiple converters in noise-sensitive or EMI-constrained systems.
What current sensing methods does the LTC3890IUH#TRPBF support?
The LTC3890IUH#TRPBF supports both RSENSE (shunt resistor) and DCR (inductor winding resistance) current sensing via differential SENSE+/- inputs. The current threshold is programmable (22/43/64mV) using the ILIM pin state (GND/FLOAT/INTVCC), enabling optimization for accuracy, power loss, or cost in each application.
Is the LTC3890IUH#TRPBF pin-compatible with other variants in the LTC3890 family?
Yes - all LTC3890 variants (E/I/H/MP grades, #PBF/#TRPBF/#WPBF suffixes) share identical 32-pin UH QFN packaging and pinout. The LTC3890IUH#TRPBF differs only in temperature grade (–40°C to +125°C) and tape-and-reel packaging; electrical functionality and layout compatibility are fully maintained across the family.
LTC3890IUH#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)
LTC3890IUH#TRPBF FAQ
1.How can I place an order for LTC3890IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890IUH#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#TRPBF reliable?
The price and inventory of LTC3890IUH#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890IUH#TRPBF?
LTC3890IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890IUH#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#TRPBF?
For technical support, including LTC3890IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890IUH#TRPBF requirements.
6.How does Aetrix verify that LTC3890IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890IUH#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890IUH#TRPBF?
All LTC3890IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890IUH#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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