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Analog Devices Inc. LTC3890MPGN-3#PBF
- Part No.:
- LTC3890MPGN-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890MPGN-3#PBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
LTC3890MPGN-3#PBF from Analog Devices (formerly Linear Technology) is a high-performance dual-phase synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages. It supports 4V–60V input, delivers dual regulated outputs (0.8V–24V), operates with 50µA quiescent current in single-channel sleep mode, and features out-of-phase operation to reduce input ripple-ideal for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890MPGN-3#PBF datasheet, LTC3890MPGN-3#PBF pinout, LTC3890MPGN-3#PBF application, or LTC3890MPGN-3#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, dual-channel phase-lockable frequency (75kHz–850kHz), RSENSE/DCR current sensing flexibility, and programmable light-load modes (Burst Mode®, pulse-skipping, or forced continuous).
Technical Context
The LTC3890MPGN-3#PBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize input capacitor stress and power supply noise. Each channel uses an error amplifier (EA) comparing VFB to a 0.800V reference, with ITH voltage setting peak inductor current trip point via differential SENSE+/- inputs.
It integrates dual gate drivers (TG/BG) with 2.5Ω pull-up and 1.5Ω pull-down on top-side drivers, supports EXTVCC switchover at 4.7V, and includes OPTI-LOOP® compensation for stable transient response across wide output capacitance and ESR ranges. The PLLIN/MODE pin selects light-load behavior without requiring external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide intermediate bus voltages and battery chemistries including 12V, 24V, and 48V systems. |
| Quiescent Current (1 ch active) | 50µA - extends runtime in battery-operated applications such as telematics and infotainment modules. |
| Output Voltage Range | 0.8V to 24V - enables generation of core logic (0.8V–1.2V), I/O (1.8V–3.3V), and auxiliary rails (5V, 8.5V, 12V) from one IC. |
| Switching Frequency Range | 75kHz to 850kHz - allows optimization of size vs. efficiency; phase-lockable to external clock for EMI reduction. |
| Operating Temperature | –55°C to 150°C - qualified for under-hood automotive applications and industrial environments with extreme thermal cycling. |
| Current Sensing | RSENSE or DCR - supports both discrete shunt resistors and inductor DCR sensing, reducing BOM count and board space. |
| Duty Cycle Max | 99% - enables ultra-low dropout operation, critical for high-VIN/low-VOUT conversion (e.g., 48V→3.3V). |
Pinout & Package
28-Lead Plastic SSOP (GN) package, narrow body, RoHS-compliant lead-free finish. Pin pitch: 0.635mm. Exposed pad not present. Thermal resistance θJA = 80°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / current limit control | Directly sets per-channel peak inductor current threshold; used for loop compensation and current foldback. |
| VFB1, VFB2 | Feedback input | Compares output voltage (via resistor divider) to internal 0.800V reference; determines regulation accuracy and load line. |
| SENSE1+, SENSE2+ | Current sense positive input | Connects to high-side of current sense resistor or DCR network; differential pair with SENSE– defines current trip point. |
| SENSE1–, SENSE2– | Current sense negative input | Reference node for current comparator; supports ground-referenced sensing when common-mode voltage < 0.5V. |
| PLLIN/MODE | Mode selection / sync input | Selects Burst Mode®, pulse-skipping, or forced continuous at light loads; accepts external clock for synchronization. |
| RUN1, RUN2 | Channel enable control | Digital shutdown pins: <1.15V disables individual channel; both <0.7V enters ultra-low-IQ shutdown (<14µA). |
| TG1, TG2 | Top gate driver output | Floating high-side N-MOSFET driver with INTVCC-referenced swing; requires bootstrap capacitor between BOOST and SW. |
| BG1, BG2 | Bottom gate driver output | Ground-referenced low-side N-MOSFET driver; complements TG to form synchronous rectification stage. |
| TRACK/SS1, TRACK/SS2 | Soft-start / tracking input | Internal 1µA pull-up charges external capacitor for controlled ramp-up; also accepts external voltage for rail tracking. |
| PGOOD1 | Power good indicator | Open-drain output asserting when VFB1 deviates >±10% from setpoint; only monitors Channel 1 (LTC3890-3 variant limitation). |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input current by ~30%, allowing smaller input capacitors and lower EMI in distributed power systems. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of ceramic and polymer output capacitors (10µF–1000µF) and ESR (0.5mΩ–50mΩ). |
| EXTVCC switchover | Automatically switches INTVCC sourcing from VIN LDO to external 4.7V–14V supply, improving system efficiency when using regulated auxiliary rails. |
| 99% max duty cycle | Supports high-step-down ratios (e.g., 48V→3.3V) without requiring additional pre-regulation stages or complex topology changes. |
| Independent soft-start/tracking | Per-channel TRACK/SS pins allow staggered startup sequencing or precise voltage ramp alignment with other system rails. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC Dual-Rail Converter |
|---|---|
|
Use Scenario: Powering SoC cores (0.85V/2A), DDR memory (1.2V/3A), and display interface (3.3V/1A) from 12V vehicle battery with cold-crank tolerance down to 4V. IC Role / Device Role: Dual-phase synchronous buck controller managing two independent output rails with coordinated soft-start and fault monitoring. Use Value: 50µA IQ extends backup runtime during ignition-off; 150°C rating ensures reliability in sealed head-unit enclosures. |
Use Scenario: Generating isolated 5V (for logic) and 24V (for sensors/actuators) from 48V industrial bus in programmable logic controller chassis. IC Role / Device Role: High-input-voltage dual controller enabling compact, efficient local regulation without bulky isolated DC/DC modules. Use Value: 60V absolute max input withstands 48V bus transients; out-of-phase operation reduces input capacitor stress in space-constrained DIN-rail mounts. |
| Battery-Powered Telematics Module | Distributed Telecom Power System |
|
Use Scenario: Converting LiFePO₄ battery (2.8V–3.6V) boosted to 12V, then stepped down to 3.3V (RF modem) and 1.8V (GPS SoC) in GPS tracker. IC Role / Device Role: Dual-output buck controller supporting dynamic rail scaling and deep-sleep mode coordination with host MCU. Use Value: Sleep-mode IQ of 50µA preserves battery life over multi-week standby; programmable light-load modes optimize efficiency across load range. |
Use Scenario: Providing redundant 3.3V and 12V rails from 54V telecom rectifier output in base station remote radio unit (RRU). IC Role / Device Role: High-reliability dual controller with extended temperature support for outdoor cabinet deployment. Use Value: –55°C start-up capability ensures operation in arctic climates; 150°C junction rating accommodates passive cooling in sealed 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 |
|---|---|---|---|
| LTC3890HGN-3#PBF | Same functionality but rated for –40°C to 150°C; lacks extended low-temp qualification below –40°C. | Suitable for non-military automotive or industrial use where –55°C start-up is not required. | Select LTC3890MPGN-3#PBF when cold-environment operation (e.g., aerospace, polar instrumentation) mandates guaranteed –55°C functionality. |
| LTC3890IGN-3#PBF | Rated –40°C to 125°C; identical pinout and electrical specs except for temperature grade and thermal derating. | Targeted at commercial/industrial applications with standard ambient ranges (e.g., factory automation, medical devices). | Choose LTC3890IGN-3#PBF for cost-sensitive designs where extended temperature performance is unnecessary. |
Compared with LTC3890HGN-3#PBF and LTC3890IGN-3#PBF, the LTC3890MPGN-3#PBF uniquely guarantees full functionality at –55°C while maintaining identical electrical behavior, making it the only option for mission-critical systems requiring cold-start reliability without design revalidation.
Availability
LTC3890MPGN-3#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power supplies, and battery-powered telematics requiring stable component supply across extended temperature extremes and long production lifecycles.
Supply support for LTC3890MPGN-3#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, automotive, industrial, and communications markets.
The LTC3890 family was designed specifically for high-efficiency, high-reliability dual-output DC/DC conversion in harsh environments-emphasizing ultra-low quiescent current, wide input range, and robust thermal performance for automotive and industrial applications.
FAQ
What is the operating temperature range of the LTC3890MPGN-3#PBF?
The LTC3890MPGN-3#PBF is specified for operation from –55°C to 150°C junction temperature. This extended range is fully tested and guaranteed, distinguishing it from commercial or industrial-grade variants like the LTC3890IGN-3#PBF (–40°C to 125°C) and enabling use in under-hood automotive, aerospace, and outdoor industrial equipment where extreme thermal margins are required. The device maintains all electrical specifications across this full range.
Does the LTC3890MPGN-3#PBF support dual independent PGOOD outputs?
No. The LTC3890MPGN-3#PBF provides only one open-drain PGOOD1 output, which monitors Channel 1's output voltage (VFB1). Unlike the LTC3890-1 and LTC3890-2 variants, the LTC3890-3 version-including LTC3890MPGN-3#PBF-does not include a second PGOOD2 pin. Designers requiring dual-rail fault monitoring must implement external supervision circuitry for Channel 2.
How does the PLLIN/MODE pin configure light-load operation on the LTC3890MPGN-3#PBF?
The PLLIN/MODE pin on the LTC3890MPGN-3#PBF selects light-load behavior for both channels simultaneously: grounding it enables Burst Mode® operation (highest light-load efficiency); tying it to INTVCC forces continuous conduction mode; applying 1.2V–(INTVCC–1.3V) enables pulse-skipping. This pin also accepts external clocks up to 850kHz for synchronization-critical for EMI-sensitive applications like automotive radar subsystems.
Can the LTC3890MPGN-3#PBF drive high-side MOSFETs without external bootstrap components?
No. The LTC3890MPGN-3#PBF requires external bootstrap capacitors (CB) and Schottky diodes between BOOST and INTVCC for each channel's top-gate driver (TG1/TG2). The BOOST pins provide floating bias for the high-side N-MOSFET gates, and proper bootstrap design-including capacitor value (typically 0.1µF ceramic) and diode forward voltage-is essential for reliable operation, especially near dropout conditions.
What current sensing methods does the LTC3890MPGN-3#PBF support?
The LTC3890MPGN-3#PBF supports both RSENSE (discrete shunt resistor) and DCR (inductor winding resistance) current sensing via its differential SENSE+ and SENSE– inputs. Its architecture allows ground-referenced DCR sensing without requiring the VFB voltage to drop below 0.65V-unlike earlier variants-making it suitable for non-synchronous boost or SEPIC configurations where sensing must remain referenced to PGND.
LTC3890MPGN-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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, Power Good, Soft Start, Tracking
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3890MPGN-3#PBF FAQ
1.How can I place an order for LTC3890MPGN-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890MPGN-3#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 LTC3890MPGN-3#PBF reliable?
The price and inventory of LTC3890MPGN-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890MPGN-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890MPGN-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890MPGN-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890MPGN-3#PBF?
LTC3890MPGN-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890MPGN-3#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 LTC3890MPGN-3#PBF?
For technical support, including LTC3890MPGN-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890MPGN-3#PBF requirements.
6.How does Aetrix verify that LTC3890MPGN-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890MPGN-3#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 LTC3890MPGN-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890MPGN-3#PBF?
All LTC3890MPGN-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890MPGN-3#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 LTC3890MPGN-3#PBF part is unused and in its original packaging.
Return procedure for LTC3890MPGN-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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