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Analog Devices Inc. LTC3890MPUH-2#PBF
- Part No.:
- LTC3890MPUH-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890MPUH-2#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,184
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Product details
Overview
LTC3890MPUH-2#PBF from Analog Devices is a high-efficiency, dual-phase synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages. It operates from 4V to 60V input, delivers 0.8V–24V outputs per channel, achieves 50µA quiescent current in single-channel sleep mode, and supports AEC-Q100 Grade MP (–55°C to 150°C) for automotive always-on systems.
For engineers reviewing the LTC3890MPUH-2#PBF datasheet, LTC3890MPUH-2#PBF pinout, LTC3890MPUH-2#PBF application, or LTC3890MPUH-2#PBF equivalent, key selection criteria include out-of-phase dual-channel operation to reduce input ripple, programmable 50kHz–900kHz switching frequency, selectable light-load modes (Burst Mode®, pulse-skipping, continuous), RSENSE/DCR current sensing, and robust thermal performance in the 5mm × 5mm QFN package.
Technical Context
The LTC3890MPUH-2#PBF implements constant-frequency current-mode control with independent error amplifiers (ITH1/ITH2), dual differential current comparators (SENSE1±/SENSE2±), and phase-locked loop synchronization via PLLIN/MODE. Its OPTI-LOOP® compensation enables stable transient response across wide output capacitance and ESR ranges.
It features dual independent TRACK/SS pins for soft-start or voltage tracking, programmable current limit via ILIM pin (GND/FLOAT/INTVCC), and internal LDOs powered from VIN or EXTVCC (4.7V switchover). The 180° out-of-phase operation between channels minimizes input capacitor RMS current and power supply noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide battery chemistries (12V/24V/48V systems) and intermediate bus rails without external pre-regulation. |
| Quiescent Current (Sleep) | 50µA (one channel active) - extends runtime in always-on automotive modules and battery-powered telemetry devices. |
| Output Voltage Range | 0.8V to 24V - enables direct generation of logic (3.3V), I/O (5V/8.5V), and analog (12V/15V) rails from a single controller. |
| Switching Frequency | 50kHz to 900kHz (programmable) - allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI filtering requirements. |
| Operating Temp Range | –55°C to +150°C (Junction) - qualified per AEC-Q100 Grade MP for under-hood automotive applications including engine control units. |
| Current Sense Threshold | 22mV to 85mV (selectable via ILIM) - provides precise overcurrent protection across varying RSENSE values and DCR-based designs. |
| Duty Cycle Max | 99% - enables ultra-low dropout operation (e.g., 12V→11.5V) without requiring external boost bias for gate drivers. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed pad (Pin 33 = SGND), 0.75mm profile. Requires soldering of exposed pad to PCB ground for thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Accepts common-mode voltage up to 28V; supplies current when > INTVCC – 0.5V - enables ground-referenced DCR sensing. |
| FREQ (2) | VCO frequency programming | 20µA internal pull-up sets oscillator frequency; resistor-to-GND selects 50kHz–900kHz - eliminates need for external clock source. |
| PHASMD (3) | Phase relationship selector | Configures TG2/CLKOUT phase offset relative to TG1 (180°/240°/floating default) - enables 2-phase or 3-phase interleaving with external controllers. |
| PLLIN/MODE (5) | Synchronization & light-load mode control | Accepts external clock for PLL sync; selects Burst Mode® (GND/floating), pulse-skipping (1.2V–INTVCC–1.3V), or forced CCM (INTVCC) - critical for EMI-sensitive automotive infotainment. |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Logic-level shutdown: <1.15V disables channel; both <0.7V enters 14µA shutdown - supports dynamic rail sequencing and fault isolation. |
| TRACK/SS1 / TRACK/SS2 (13, 29) | Soft-start & output tracking | Internal 1µA pull-up; voltage on pin sets VFB ramp target - enables controlled startup and voltage-following for multi-rail SoCs (e.g., FPGA core/I/O banks). |
| ILIM (28) | Current limit threshold select | GND/FLOAT/INTVCC selects max sense voltage (22/43/64mV typ) - allows one design to support multiple current ratings without layout change. |
| PGOOD1 / PGOOD2 (14, 27) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint - provides independent rail monitoring for system-level power sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces input capacitor RMS current by ~30% and lowers conducted EMI compared to in-phase controllers - cuts bulk capacitor count in half for same ripple spec. |
| OPTI-LOOP® compensation | Allows stable loop response with ceramic output capacitors ranging from 10µF to 1000µF and ESR from 0.5mΩ to 50mΩ - eliminates need for electrolytic caps and simplifies BOM. |
| Low IQ sleep mode (50µA) | Enables >1-year battery life in wake-on-LIN/CAN automotive sensors - meets ISO 16750-2 quiescent current requirements for Class III loads. |
| 99% duty cycle capability | Supports high-VIN-to-VOUT ratios (e.g., 48V→47V) without external bootstrap assist - avoids complexity of charge-pump circuits in industrial PoE++ systems. |
| AEC-Q100 Grade MP qualification | Validated for –55°C to +150°C operation with extended reliability testing (HTOL, TC, UHAST) - certified for safety-critical ADAS domain controllers and powertrain ECUs. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and analog front-end in under-hood ECU exposed to extreme temperature cycling and vibration. IC Role / Device Role / Timing Role: Dual-output controller generating 5V (MCU/VDD) and 3.3V (CAN PHY/sensors) from 12V battery with cold-crank immunity down to 4V. Use Value: 50µA sleep IQ and –55°C start-up capability ensure reliable boot after long vehicle idle; out-of-phase operation suppresses EMI near sensitive crankshaft position sensor signals. |
Use Scenario: Battery-powered wireless sensor node deployed in remote oil/gas pipeline monitoring with 10-year field life requirement. IC Role / Device Role / Timing Role: Primary power controller managing LiSOCl₂ battery (3.6V nominal) to generate 3.3V for MCU/radio and 1.8V for precision ADC via external LDO. Use Value: 14µA shutdown current and programmable Burst Mode® extend battery life; RSENSE current sensing enables accurate coulomb counting for state-of-charge estimation. |
| Telecom Distributed Power System | Medical Portable Diagnostic Device |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying isolated 12V and 5V rails to multiple line cards. IC Role / Device Role / Timing Role: Dual-phase controller operating at 300kHz to drive paralleled MOSFETs, reducing conduction losses while meeting EN55022 Class B conducted EMI limits. Use Value: Phase-lockable frequency synchronizes to system clock to avoid beat frequencies; EXTVCC input allows efficient 12V rail to power INTVCC, cutting total system losses by ~150mW. |
Use Scenario: Portable ultrasound device requiring ultra-low-noise, tightly regulated power for analog beamforming ASICs and high-speed ADCs. IC Role / Device Role / Timing Role: Dual-output controller delivering 1.2V (core) and 2.5V (I/O) from 16.8V Li-ion pack, with independent soft-start to prevent inrush-induced voltage droop on shared battery rail. Use Value: Independent TRACK/SS pins enable precise voltage sequencing (core before I/O); low 0.8V feedback reference minimizes resistor divider error impact on accuracy. |
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-2#PBF | Same architecture and pinout; rated for –40°C to +150°C (not –55°C) | Lacks extended low-temp qualification for arctic/military deployments | Select when full Grade MP temp range is not required; lower cost alternative for commercial-automotive hybrids. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers; 4.5V–60V input; no EXTVCC or ILIM pin | Higher integration but fixed current limit and no independent TRACK/SS - less flexible for precision sequencing | Choose for space-constrained designs where driver integration outweighs configurability needs; verify thermal derating at 150°C junction. |
Compared with LTC3890HUH-2#PBF, the LTC3890MPUH-2#PBF adds guaranteed operation at –55°C and enhanced reliability screening, while MP2918GL-Z trades external component flexibility for smaller footprint and simplified layout - making LTC3890MPUH-2#PBF optimal for mission-critical automotive and industrial applications demanding maximum configurability and environmental resilience.
Availability
LTC3890MPUH-2#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial IoT sensor nodes, telecom distributed power systems, and medical portable diagnostic devices requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC3890MPUH-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 automotive, industrial, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3890MPUH-2#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, engineered specifically for demanding automotive and industrial applications requiring ultra-low quiescent current, wide input range, and AEC-Q100 qualification.
FAQ
What is the minimum input voltage supported by the LTC3890MPUH-2#PBF?
The LTC3890MPUH-2#PBF supports a minimum input voltage of 4V, enabling reliable operation during automotive cold-crank events where battery voltage can dip to 3.5V–4.0V. This specification is guaranteed across its full –55°C to +150°C operating junction temperature range, making LTC3890MPUH-2#PBF suitable for engine bay applications where low-voltage robustness is critical.
How does the ILIM pin affect current limiting on the LTC3890MPUH-2#PBF?
The ILIM pin on the LTC3890MPUH-2#PBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This directly sets the peak inductor current trip point for both channels, allowing a single PCB layout to support multiple output current ratings by changing only the ILIM connection - a key advantage for scalable power designs using LTC3890MPUH-2#PBF.
Can the LTC3890MPUH-2#PBF synchronize to an external clock?
Yes, the LTC3890MPUH-2#PBF can synchronize to an external clock via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop aligns the rising edge of TG1 with the rising edge of that clock, supporting frequencies from 75kHz to 850kHz. This capability enables EMI reduction through frequency dithering and deterministic timing in multi-controller systems using LTC3890MPUH-2#PBF.
What is the purpose of the EXTVCC pin on the LTC3890MPUH-2#PBF?
The EXTVCC pin on the LTC3890MPUH-2#PBF provides an alternative power source for the internal INTVCC LDO. When EXTVCC exceeds 4.7V, the device switches from VIN-powered LDO to EXTVCC-powered LDO, improving overall system efficiency - especially when powering INTVCC from a clean, high-efficiency downstream rail like the 5V output of LTC3890MPUH-2#PBF itself. This reduces power loss and thermal stress.
Does the LTC3890MPUH-2#PBF support output voltage tracking?
Yes, the LTC3890MPUH-2#PBF supports output voltage tracking via independent TRACK/SS1 and TRACK/SS2 pins. Each pin has an internal 1µA pull-up current; connecting an external resistor divider from a master supply to TRACK/SS causes the corresponding output to follow that supply during startup. This ensures safe sequencing for multi-rail FPGAs or processors, a core functionality implemented directly in LTC3890MPUH-2#PBF without external circuitry.
LTC3890MPUH-2#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, 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890MPUH-2#PBF FAQ
1.How can I place an order for LTC3890MPUH-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890MPUH-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 LTC3890MPUH-2#PBF reliable?
The price and inventory of LTC3890MPUH-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 LTC3890MPUH-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890MPUH-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890MPUH-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890MPUH-2#PBF?
LTC3890MPUH-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890MPUH-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 LTC3890MPUH-2#PBF?
For technical support, including LTC3890MPUH-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890MPUH-2#PBF requirements.
6.How does Aetrix verify that LTC3890MPUH-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890MPUH-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 LTC3890MPUH-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890MPUH-2#PBF?
All LTC3890MPUH-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890MPUH-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 LTC3890MPUH-2#PBF part is unused and in its original packaging.
Return procedure for LTC3890MPUH-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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