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Analog Devices Inc. LTC3890MPUH#PBF
- Part No.:
- LTC3890MPUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890MPUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:321
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Product details
Overview
LTC3890MPUH#PBF from Analog Devices is a dual-phase, synchronous step-down DC/DC controller for automotive and industrial power systems. It supports 4V–60V input, delivers two independent outputs (0.8V–24V), operates with 50µA quiescent current in single-channel sleep mode, and features out-of-phase operation to reduce input ripple. It is used in always-on vehicle ECUs requiring high reliability under wide temperature swings.
For engineers reviewing the LTC3890MPUH#PBF datasheet, LTC3890MPUH#PBF pinout, LTC3890MPUH#PBF application, or LTC3890MPUH#PBF equivalent, key selection criteria include its AEC-Q100 qualification (–55°C to 150°C), dual-channel phase-lockable frequency (75kHz–850kHz), RSENSE/DCR sensing flexibility, and selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous).
Technical Context
The LTC3890MPUH#PBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize input capacitor RMS current and system noise. Each channel features a transconductance error amplifier (gm = 2 mmho), programmable current limit via ILIM pin (three threshold options), and OPTI-LOOP® compensation supporting wide output capacitance/ESR ranges.
It integrates dual N-channel MOSFET gate drivers (TG/BG) with 2.5Ω pull-up and 1.5Ω pull-down on TG, 2.4Ω/1.1Ω on BG, and supports dropout operation up to 99% duty cycle. Internal LDO powers INTVCC from VIN or EXTVCC (switchover at 4.7V), and the device includes precision 0.8V reference (±0.8% over –55°C to 150°C), PGOOD monitoring, and output overvoltage protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V battery buses and intermediate rails without external pre-regulation. |
| Quiescent Current | 50µA (one channel active) - enables >1-year runtime in battery-backed always-on systems at µA-level loads. |
| Output Voltage Range | 0.8V to 24V - covers logic supplies (3.3V/5V), analog rails (8.5V), and higher-voltage subsystems (e.g., sensors, actuators). |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI shaping, layout optimization, and synchronization with other converters. |
| Operating Temp | –55°C to +150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive and harsh industrial environments. |
| Current Sensing | RSENSE or DCR - eliminates need for dedicated sense resistors in high-current designs, reducing power loss and BOM cost. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation (e.g., 12V→11.5V), critical for brownout resilience in automotive cold-crank conditions. |
Pinout & Package
32-lead (5mm × 5mm) plastic QFN package with exposed thermal pad (Pin 33 = SGND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Biased current source enables accurate DCR sensing; voltage > INTVCC – 0.5V activates internal current source. |
| FREQ (2) | VCO frequency programming | 20µA internal pull-up sets oscillator frequency; resistor to GND programs 50kHz–900kHz range. |
| PHASMD (3) | Phase relationship selector | Configures TG2/CLKOUT phase offset vs TG1 (180°/240°/floating = 180°/90°) for multi-phase interleaving. |
| PLLIN/MODE (5) | Synchronization & light-load mode control | Accepts external clock for PLL sync; selects Burst Mode® (GND), pulse-skipping (mid-voltage), or forced CCM (INTVCC). |
| SGND (6, 33) | Small-signal ground reference | Must be routed separately from PGND to avoid noise coupling into feedback and current sense paths. |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Logic-level shutdown: <1.16V (RUN1) or <1.20V (RUN2) disables respective channel; both <0.7V enters ultra-low-IQ shutdown (<14µA). |
| TG1 / TG2 (26, 15) | Top N-MOSFET gate drive | Floating drivers with ~INTVCC swing; support bootstrap operation and dropout recovery via built-in CB recharge logic. |
| PGOOD1 / PGOOD2 (27, 14) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint - enables sequencing and fault reporting in multi-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces input capacitor RMS current by ~30% and lowers conducted EMI vs in-phase operation. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of ceramic or polymer output capacitors (10µF–1000µF) and ESR (0.5mΩ–50mΩ). |
| Selectably programmable current limit | ILIM pin configures max sense voltage to 22/43/64mV - simplifies design for varying MOSFET RDS(on) or sense resistor values. |
| Independent TRACK/SS pins | Supports individual soft-start ramp or voltage tracking between outputs - essential for FPGA/CPU core–I/O rail sequencing. |
| Internal LDO with EXTVCC switchover | Allows INTVCC to be powered from high-efficiency converter output (e.g., 5V rail), cutting total system power loss. |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interfaces in vehicle door modules with battery input (9V–16V) and cold-crank survival down to 4.5V. IC Role / Device Role / Timing Role: Dual-output controller generating 3.3V (MCU core) and 8.5V (sensor bias) with independent soft-start and PGOOD sequencing. Use Value: 50µA IQ extends backup battery life; 99% duty cycle maintains 3.3V during 6V cold-crank; AEC-Q100 qualification ensures reliability over –40°C to 125°C ambient. | Use Scenario: Distributed 24V DC power system supplying field I/O modules, isolated ADCs, and communication interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck controller converting 24V bus to 5V (logic) and 12V (actuator drivers), synchronized to system clock via PLLIN. Use Value: Out-of-phase operation reduces bulk capacitor stress; RSENSE/DCR flexibility accommodates legacy inductor designs; –55°C start capability supports outdoor deployment. |
| Battery-Powered Telematics Unit | Medical Diagnostic Imaging Subsystem |
Use Scenario: Always-on GPS/cellular module powered from 12V lead-acid battery with periodic wake-up bursts and long sleep intervals. IC Role / Device Role / Timing Role: Dual controller delivering 3.3V (modem) and 5V (memory/SD card), using Burst Mode® to maintain <100µA system standby current. Use Value: 14µA shutdown IQ prevents battery drain; independent RUN pin control enables MCU-governed power gating of non-critical rails. | Use Scenario: High-precision analog front-end powering ADCs, op-amps, and reference buffers in portable ultrasound equipment with Li-ion battery input (3.0V–4.2V boosted to 12V). IC Role / Device Role / Timing Role: Secondary regulator stepping 12V intermediate rail to ultra-low-noise ±5V and +3.3V supplies with tight load regulation (<0.1%). Use Value: 0.8V reference accuracy (±0.8%) and low load regulation (±0.01%) ensure measurement integrity; low-noise PGOOD enables clean power-up of sensitive analog circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891MPUH#PBF | Single-output version with identical VIN range, IQ, and temp grade; lacks second channel and phase-control pins. | Used where only one regulated rail is needed - saves board space but requires separate controller for second output. | Select when system requires only one high-efficiency buck stage and cost/size optimization outweighs dual-channel integration. |
| MP2918GL-Z | Non-AEC-Q100, commercial-grade (–40°C to 125°C); lower IQ (75µA), no EXTVCC switchover, fixed 600kHz frequency only. | Suitable for non-automotive industrial or telecom applications where extended temp and ultra-low IQ are not required. | Choose for cost-sensitive, non-automotive designs where 600kHz fixed frequency and simpler feature set suffice. |
Compared with LTC3891MPUH#PBF and MP2918GL-Z, the LTC3890MPUH#PBF uniquely combines dual-channel interleaving, AEC-Q100 Grade 1 qualification, and programmable light-load operation - making it the only option for automotive dual-rail systems demanding simultaneous efficiency, reliability, and design flexibility.
Availability
LTC3890MPUH#PBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and battery-operated telematics systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3890MPUH#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.
The LTC3890MPUH#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-reliability, wide-input-voltage DC/DC conversion in automotive and harsh-environment applications.
FAQ
What is the maximum junction temperature specification for the LTC3890MPUH#PBF?
The LTC3890MPUH#PBF is tested and guaranteed over a junction temperature range of –55°C to +150°C, meeting AEC-Q100 Grade 1 requirements. Its absolute maximum TJ is 150°C, and thermal design must ensure θJA derating - e.g., at 150°C ambient with 34°C/W, power dissipation must stay below 0W to avoid exceeding TJmax.
How does the ILIM pin affect current limiting on the LTC3890MPUH#PBF?
The ILIM pin on the LTC3890MPUH#PBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = INTVCC), or 64mV (ILIM = FLOAT). This directly sets the peak inductor current trip point for both channels, enabling flexible MOSFET RDS(on) or sense resistor selection without changing external components.
Can the LTC3890MPUH#PBF synchronize to an external clock, and how is it configured?
Yes, the LTC3890MPUH#PBF synchronizes to an external clock via the PLLIN/MODE pin. When an external clock signal (75kHz–850kHz) is applied, the internal phase-locked loop aligns the rising edge of TG1 with the rising edge of that clock. No additional configuration is needed beyond connecting the clock source - the device automatically enters PLL mode and disables light-load mode selection on that pin.
What is the purpose of the PHASMD pin on the LTC3890MPUH#PBF?
The PHASMD pin on the LTC3890MPUH#PBF configures the phase relationship between the two controller channels and the CLKOUT signal. Pulling it to GND, INTVCC, or leaving it floating sets TG2 and CLKOUT to be 180°/240° or 180°/90° out-of-phase with TG1 - enabling optimized interleaving for reduced input ripple and scalable multi-phase designs using daisy-chained controllers.
Does the LTC3890MPUH#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3890MPUH#PBF supports output voltage tracking via independent TRACK/SS1 and TRACK/SS2 pins. Connecting an external resistor divider from a master supply to each TRACK/SS pin causes the corresponding VOUT to ramp proportionally during startup - enabling precise sequencing of core and I/O rails in FPGAs or processors without external supervisors.
LTC3890MPUH#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
- 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#PBF FAQ
1.How can I place an order for LTC3890MPUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890MPUH#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#PBF reliable?
The price and inventory of LTC3890MPUH#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890MPUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890MPUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890MPUH#PBF?
LTC3890MPUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890MPUH#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#PBF?
For technical support, including LTC3890MPUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890MPUH#PBF requirements.
6.How does Aetrix verify that LTC3890MPUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890MPUH#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890MPUH#PBF?
All LTC3890MPUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890MPUH#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#PBF part is unused and in its original packaging.
Return procedure for LTC3890MPUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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