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Analog Devices Inc. LTC3890MPUH#TRPBF
- Part No.:
- LTC3890MPUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890MPUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,939
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Product details
Overview
LTC3890MPUH#TRPBF from Analog Devices is a high-efficiency, dual-phase synchronous step-down DC/DC controller designed for automotive and industrial power systems. It supports 4V–60V input, delivers two independent outputs (e.g., 8.5V/3.3V), 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 ultra-low IQ and robust start-up under wide VIN.
For engineers reviewing the LTC3890MPUH#TRPBF datasheet, LTC3890MPUH#TRPBF pinout, LTC3890MPUH#TRPBF application, or LTC3890MPUH#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, –55°C to 150°C operating range, programmable current limit via ILIM pin, phase-lockable 75kHz–850kHz switching frequency, and dual independent TRACK/SS pins for soft-start and voltage tracking.
Technical Context
The LTC3890MPUH#TRPBF implements a constant-frequency current-mode architecture with two fully independent controllers operating 180° out-of-phase to minimize input capacitor RMS current and system noise. Each channel uses a transconductance error amplifier (gm = 2 mmho) and precision 0.8V reference (±0.8% over temperature) to regulate output voltage.
It integrates dual N-channel MOSFET gate drivers (TG/BG), internal LDOs for INTVCC generation from VIN or EXTVCC, and configurable light-load operation (Burst Mode®, pulse-skipping, or forced CCM) selected via the PLLIN/MODE pin. The device supports RSENSE or DCR current sensing and 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 - supports 12V/24V/48V battery buses and intermediate industrial rails without external pre-regulation. |
| Quiescent Current | 50µA (one channel active) - enables >1-year runtime in always-on automotive modules powered by 12V lead-acid batteries. |
| Output Voltage Range | 0.8V to 24V - allows direct regulation of core logic (0.8V), I/O (1.8V/3.3V), and analog subsystems (5V/8.5V/12V). |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - permits optimization of size vs. EMI: low f for high efficiency at high load, high f for compact magnetics in space-constrained designs. |
| Current Sensing | RSENSE or DCR - eliminates need for dedicated sense resistors in high-current applications, reducing conduction loss and board area. |
| Operating Temp | –55°C to +150°C - qualified per AEC-Q100 Grade 1, enabling deployment in engine bay, transmission control, and under-hood ADAS modules. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation (e.g., 12V→11.5V), critical for maintaining regulation during cold-crank events. |
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 automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Connects to low-side of sense resistor or DCR network; supplies bias current when > INTVCC – 0.5V to enable accurate zero-current detection. |
| FREQ (2) | VCO frequency programming | Resistor-to-GND sets switching frequency from 50kHz to 900kHz; internal 20µA pull-up enables precise VCO control without external bias. |
| PLLIN/MODE (5) | Sync input / light-load mode select | Accepts external clock for synchronization; selects Burst Mode® (ground), pulse-skipping (mid-rail), or forced CCM (INTVCC) - no external logic required. |
| TRACK/SS1 / TRACK/SS2 (13, 29) | Soft-start & tracking control | Internal 1µA pull-up charges external capacitor for linear ramp; also accepts resistor divider from another rail to enforce startup sequencing. |
| ILIM (28) | Current limit threshold select | Tie to SGND/FLOAT/INTVCC to set max sense voltage to 22/43/64mV - configures current limit without trimming resistors. |
| PGOOD1 / PGOOD2 (14, 27) | Open-drain power-good indicator | Asserts low when VFB deviates > ±10% from 0.8V - provides system-level fault signaling compatible with microcontroller reset inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces input capacitor RMS current by ~30% and lowers conducted EMI compared to in-phase operation - cuts required bulk capacitance and improves EMC compliance. |
| OPTI-LOOP® compensation | Enables stable loop response across wide ranges of output capacitance (10µF–1000µF) and ESR (0.5mΩ–100mΩ) - eliminates iterative compensation tuning for diverse ceramic/polymer cap selections. |
| Independent RUN1/RUN2 control | Allows asymmetric power sequencing: e.g., keep VOUT1 (3.3V logic) always-on while dynamically enabling VOUT2 (8.5V analog) only during sensor acquisition - reduces system standby power. |
| Dropout detector with CB recharge | Forces periodic top-FET off-time during 99% duty cycle operation to refresh bootstrap capacitors - prevents gate drive collapse in high-VIN-to-VOUT ratio applications like cold-crank 4.5V→3.3V. |
| EXTVCC switchover | Automatically switches INTVCC supply from VIN LDO to external 4.7V–13V source - enables efficient self-biasing from regulated 5V/8.5V outputs, eliminating dedicated LDO for gate drive. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interfaces in under-hood ECU exposed to –40°C to +150°C ambient and 4V–18V battery transients. IC Role / Device Role / Timing Role: Dual-output step-down controller delivering 3.3V @ 5A and 5V @ 3A from 12V battery; manages cold-crank dropout and load dump survival via 60V abs max rating and 99% duty cycle. Use Value: AEC-Q100 MP-grade qualification ensures reliability over full automotive temperature range; 50µA IQ extends battery life during vehicle sleep mode. | Use Scenario: Generating isolated 24V and 5V rails for I/O modules and FPGA cores in factory automation cabinets with wide input variation (18V–60V DC). IC Role / Device Role / Timing Role: High-voltage dual controller regulating 24V (for solenoid drivers) and 5V (for logic) from unregulated industrial bus; uses out-of-phase operation to minimize input ripple on shared backplane. Use Value: 60V input capability eliminates need for front-end buck pre-regulator; programmable frequency avoids sensitive 400Hz/2kHz EMI bands in motor drive environments. |
| Battery-Powered Test Equipment | Distributed Telecom Power System |
Use Scenario: Portable handheld tester requiring long field operation on Li-ion pack (8.4V–12.6V), with simultaneous 3.3V MCU and 12V analog front-end supplies. IC Role / Device Role / Timing Role: Dual-phase controller delivering 3.3V @ 2A and 12V @ 1A; employs Burst Mode® to maintain >85% efficiency at 100µA load for low-power sleep states. Use Value: 50µA quiescent current extends usable battery life by >2× versus standard controllers; independent TRACK/SS pins enable synchronized ramp-up of analog and digital domains. | 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→12V/5V dual-output controller; uses CLKOUT to synchronize downstream LTC3890-based POLs, eliminating beat frequencies and simplifying EMI filtering. Use Value: Phase-lockable architecture enables deterministic multi-phase timing across distributed power stages; RSENSE/DCR flexibility accommodates legacy and new PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3890HUH#TRPBF | Same silicon, rated for –40°C to +150°C (vs. –55°C to +150°C); no extended low-temp validation. | Suitable for non-military industrial use where –55°C operation is not required; lower cost than MP grade. | Select when full automotive cold-crank spec (–40°C startup) suffices and extended low-temp qualification is unnecessary. |
| LTC3890IUH#TRPBF | Commercial/industrial grade (–40°C to +125°C); lacks AEC-Q100 qualification and extended high-temp validation. | Appropriate for consumer or non-safety-critical embedded systems with milder thermal profiles. | Choose for cost-sensitive applications outside automotive or harsh industrial environments. |
Compared with LTC3890HUH#TRPBF and LTC3890IUH#TRPBF, the LTC3890MPUH#TRPBF uniquely guarantees operation down to –55°C and full AEC-Q100 compliance - essential for engine compartment electronics, while both alternatives trade low-temperature capability for reduced cost and qualification scope.
Availability
LTC3890MPUH#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power management, industrial PLCs, and battery-operated test equipment requiring stable component supply across extreme temperature cycles and long production lifecycles.
Supply support for LTC3890MPUH#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 automotive, industrial, communications, and healthcare markets.
The LTC3890MPUH#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage controller family, engineered specifically for robust, low-quiescent-current DC/DC conversion in automotive and mission-critical industrial applications.
FAQ
What is the guaranteed operating temperature range for the LTC3890MPUH#TRPBF?
The LTC3890MPUH#TRPBF is tested and guaranteed over –55°C to +150°C junction temperature, meeting AEC-Q100 Grade 1 requirements. This extended low-temperature capability enables reliable cold-crank operation in automotive engine control units and outdoor industrial deployments where ambient temperatures fall below –40°C.
How does the LTC3890MPUH#TRPBF achieve ultra-low quiescent current?
The LTC3890MPUH#TRPBF achieves 50µA quiescent current (one channel active) through proprietary circuit design including deep-sleep state management, optimized bias networks, and selective shutdown of unused internal blocks. Its low-IQ architecture is validated across the full –55°C to +150°C range, ensuring consistent battery runtime in always-on automotive modules.
Can the LTC3890MPUH#TRPBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC3890MPUH#TRPBF supports external synchronization via the PLLIN/MODE pin. It locks to external clocks from 75kHz to 850kHz with minimal jitter, enabling deterministic multi-phase timing in distributed power systems. The internal PLL maintains tight phase alignment even under input voltage or temperature variation.
What current sensing methods does the LTC3890MPUH#TRPBF support, and how is the threshold configured?
The LTC3890MPUH#TRPBF supports both RSENSE and DCR current sensing. The maximum sense voltage threshold is configured via the ILIM pin: tying it to SGND, FLOAT, or INTVCC selects 22mV, 43mV, or 64mV respectively - allowing precise current limit setting without external resistor networks or trimming.
Does the LTC3890MPUH#TRPBF include protection features for automotive environments?
Yes, the LTC3890MPUH#TRPBF includes output overvoltage protection, power-good monitoring with ±10% trip threshold, undervoltage lockout (3.6V–4.2V), and a dropout detector that preserves bootstrap capacitor charge during 99% duty cycle operation - all critical for surviving load dump, cold-crank, and reverse-battery conditions in automotive power systems.
LTC3890MPUH#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890MPUH#TRPBF FAQ
1.How can I place an order for LTC3890MPUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890MPUH#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 LTC3890MPUH#TRPBF reliable?
The price and inventory of LTC3890MPUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890MPUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890MPUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890MPUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890MPUH#TRPBF?
LTC3890MPUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890MPUH#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 LTC3890MPUH#TRPBF?
For technical support, including LTC3890MPUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890MPUH#TRPBF requirements.
6.How does Aetrix verify that LTC3890MPUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890MPUH#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 LTC3890MPUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890MPUH#TRPBF?
All LTC3890MPUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890MPUH#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 LTC3890MPUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890MPUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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