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Analog Devices Inc. LTC3890MPGN-3#TRPBF
- Part No.:
- LTC3890MPGN-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890MPGN-3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,165
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Product details
Overview
LTC3890MPGN-3#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, dual-channel, 2-phase synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It operates from 4V to 60V input, delivers up to 5A/3A on two independent outputs (3.3V and 8.5V), and features 50µA quiescent current in single-channel sleep mode - optimized for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890MPGN-3#TRPBF datasheet, LTC3890MPGN-3#TRPBF pinout, LTC3890MPGN-3#TRPBF application, or LTC3890MPGN-3#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, out-of-phase operation reducing input ripple, programmable 50kHz–900kHz switching frequency, and dual independent TRACK/SS pins enabling precise soft-start and voltage tracking.
Technical Context
The LTC3890MPGN-3#TRPBF implements constant-frequency current-mode control with two 180° out-of-phase controllers, minimizing input capacitance requirements and supply-induced noise. Its OPTI-LOOP® compensation supports wide output capacitor ESR ranges, while the dual ITH error amplifier outputs allow independent current limit and transient response tuning per channel.
It integrates dual gate drivers (TG/BG) with 2.5Ω pull-up and 1.5Ω pull-down resistance, internal 5.1V LDO (INTVCC) powered from VIN or EXTVCC ≥4.7V, and a phase-lockable PLLIN/MODE interface supporting Burst Mode®, pulse-skipping, or forced continuous operation at light loads - all within a single 28-lead SSOP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide intermediate bus voltages and 12V/24V/48V battery systems with 65V absolute max rating. |
| Quiescent Current (Sleep) | 50µA (one channel active) - extends runtime in always-on automotive modules and portable electronics. |
| Output Voltage Range | 0.8V to 24V - enables flexible dual-rail generation (e.g., 3.3V + 8.5V) using external resistor dividers. |
| Switching Frequency | 50kHz to 900kHz (programmable) - allows optimization of size vs. efficiency; supports synchronization via PLLIN/MODE pin. |
| Current Sensing | RSENSE or DCR - supports both discrete shunt and inductor DCR sensing with ±1µA SENSE pin bias current. |
| Duty Cycle Max | 99% - enables ultra-low dropout operation near VIN = VOUT, critical for high-voltage-to-low-voltage conversion. |
| Operating Temp Range | –55°C to 150°C - qualified for harsh-environment automotive under-hood and industrial control applications. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), RoHS-compliant, lead-free finish, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 (1, 13) | Error amplifier output / current limit control | Sets per-channel peak inductor current threshold; connects to compensation network for loop stability. |
| VFB1, VFB2 (2, 12) | Feedback input | Monitors output voltage via resistive divider; regulated to 0.800V ±1.2% over temperature. |
| SENSE1+, SENSE2+ (3, 11) | Current sense positive input | Connects to high-side of RSENSE or DCR network; differential input with SENSE– for accurate current measurement. |
| SENSE1–, SENSE2– (4, 10) | Current sense negative input | Common-mode range supports ground-referenced sensing; bias current <±1µA minimizes offset error. |
| FREQ (5) | Frequency programming | Resistor-to-GND sets VCO frequency (50–900kHz); internal 20µA pull-up enables simple resistor-based configuration. |
| PLLIN/MODE (6) | Sync input / light-load mode select | Accepts external clock (75–850kHz) or DC voltage to select Burst Mode®, pulse-skipping, or forced continuous operation. |
| SGND (7) | Small-signal ground | Must be routed separately from PGND to avoid noise coupling into feedback and sensing paths. |
| RUN1, RUN2 (8, 9) | Channel enable control | Independent digital shutdown: <1.15V disables channel; both <0.7V enters ultra-low-IQ shutdown (<14µA). |
| PGOOD1 (27) | Power-good monitor | Open-drain output asserts low when VFB1 deviates >±10% from regulation - provides system-level fault signaling. |
| TRACK/SS1, TRACK/SS2 (28, 14) | Soft-start / tracking input | Internal 1µA pull-up charges external capacitor for linear ramp; also accepts external voltage for output tracking. |
| TG1, TG2 (26, 15) | Top gate driver output | Floating N-channel driver with swing = INTVCC – 0.5V superimposed on SW node - drives high-side MOSFET gates. |
| BG1, BG2 (23, 18) | Bottom gate driver output | Ground-referenced N-channel driver (0V to INTVCC) - drives synchronous rectifier MOSFETs. |
| BOOST1, BOOST2 (24, 17) | Bootstrap supply | Charged via external diode/capacitor; supplies floating gate drive for TG - enables 100% duty cycle operation. |
| SW1, SW2 (25, 16) | Switch node | Connects to inductor and bootstrap capacitor; handles high dV/dt transitions - requires tight layout to minimize ringing. |
| VIN (22) | Main power input | Primary input supply (4–60V); powers internal LDO and logic; requires local ceramic bypass capacitor. |
| INTVCC (19) | Internal LDO output | 5.1V ±3% regulated supply for drivers and control circuitry; must be decoupled with ≥4.7µF low-ESR ceramic. |
| EXTVCC (20) | External LDO input | Enables higher-efficiency power source for INTVCC when ≥4.7V - bypasses VIN LDO to reduce losses. |
| PGND (21) | Power ground | High-current return path for bottom MOSFETs and input capacitors - must connect directly to CIN(–) and MOSFET sources. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~30%, allowing smaller input bulk capacitors and lower EMI filter cost. |
| OPTI-LOOP® compensation | Enables stable loop response across wide output capacitor types (polymer, ceramic, electrolytic) and ESR values without redesign. |
| Independent TRACK/SS pins | Supports staggered start-up sequencing and precise voltage tracking between rails - essential for FPGA and multi-core SoC power-up. |
| Low-IQ sleep mode | 50µA quiescent current with one channel active meets automotive ISO 16750-2 "parking mode" requirements. |
| 99% maximum duty cycle | Enables high-efficiency operation in dropout (e.g., 12V→10V), eliminating need for linear post-regulators in many designs. |
| Programmable light-load modes | Configurable Burst Mode®, pulse-skipping, or forced continuous operation - balances efficiency vs. output ripple per application need. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual-rail power for display processor (3.3V) and audio codec (8.5V) in head-unit with cold-crank tolerance down to 4V. IC Role / Device Role / Timing Role: Primary dual-output step-down controller managing input transients, sequencing, and load-step response. Use Value: 60V input rating survives load-dump events; 50µA sleep IQ maintains RTC and CAN wake-up capability during vehicle off-state. |
Use Scenario: Distributed 24V-to-3.3V/8.5V conversion for isolated sensor inputs and microcontroller in factory automation controller. IC Role / Device Role / Timing Role: High-reliability DC/DC controller delivering tightly regulated outputs with independent soft-start and fault monitoring. Use Value: –55°C to 150°C rating ensures operation in uncooled enclosures; PGOOD1 enables system-level brown-out detection and safe shutdown. |
| Battery-Powered Test Equipment | Distributed Telecom Power System |
|
Use Scenario: Portable oscilloscope requiring low-noise 3.3V analog rail and efficient 8.5V digital rail from Li-ion (3.0–4.2V) or 12V adapter. IC Role / Device Role / Timing Role: Dual-phase buck controller with out-of-phase operation minimizing conducted EMI into sensitive analog circuits. Use Value: RSENSE/DCR flexibility accommodates compact inductors; 99% duty cycle enables direct 4.2V→3.3V conversion without boost-buck complexity. |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying multiple point-of-load regulators with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency, high-temp dual controller enabling compact board area and reduced heatsinking requirements. Use Value: 2-phase interleaving cuts input capacitor RMS current by ~70%; EXTVCC support allows powering INTVCC from downstream 5V rail for system-level efficiency gain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3890HGN-3#TRPBF | Same architecture and pinout; rated for –40°C to 150°C (vs. –55°C to 150°C for MP grade). | Lacks extended low-temp qualification; unsuitable for aerospace or extreme cold-weather automotive deployments. | Select LTC3890MPGN-3#TRPBF when operation below –40°C is required; otherwise H-grade offers identical performance at lower cost. |
| LTC3890IGN-3#TRPBF | Same functionality; rated for –40°C to 125°C industrial temperature range; lower max junction temp. | Not qualified for under-hood automotive use; limited to commercial/industrial ambient environments. | Choose LTC3890IGN-3#TRPBF only for cost-sensitive non-automotive applications where extended temp is unnecessary. |
Compared with LTC3890HGN-3#TRPBF and LTC3890IGN-3#TRPBF, the LTC3890MPGN-3#TRPBF uniquely supports operation down to –55°C while maintaining full 150°C upper limit - making it the sole option for military, aerospace, and extreme-environment automotive applications requiring full MIL-PRF-38535 Class K or AEC-Q100 Grade 0 compliance.
Availability
LTC3890MPGN-3#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, battery-powered test equipment, and distributed telecom power systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3890MPGN-3#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LTC portfolio, including rigorous automotive and high-reliability qualification processes.
The LTC3890MPGN-3#TRPBF belongs to the LTC3890 family of dual-phase synchronous buck controllers designed specifically for high-efficiency, wide-input-voltage power conversion in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the operating temperature range of the LTC3890MPGN-3#TRPBF?
The LTC3890MPGN-3#TRPBF is specified for operation from –55°C to 150°C junction temperature, making it suitable for under-hood automotive, aerospace, and industrial applications where extreme thermal conditions exist. This extended range exceeds standard industrial (–40°C to 125°C) and automotive (–40°C to 150°C) grades, and is validated per MIL-STD-883 methods for high-reliability use.
How does the LTC3890MPGN-3#TRPBF achieve ultra-low quiescent current?
The LTC3890MPGN-3#TRPBF achieves 50µA quiescent current in single-channel sleep mode through integrated circuit design that disables unused internal blocks, including oscillator sections and gate drivers for the inactive channel. Its proprietary sleep-state logic disconnects the error amplifier output (ITH pin) and parks it at 0.450V, reducing dynamic current while preserving fast wake-up capability - critical for automotive always-on systems.
Can the LTC3890MPGN-3#TRPBF synchronize to an external clock?
Yes, the LTC3890MPGN-3#TRPBF supports external clock synchronization via the PLLIN/MODE pin, accepting input frequencies from 75kHz to 850kHz. When an external clock is applied, the internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge - enabling noise-sensitive systems to avoid beat frequencies and meet strict EMI compliance requirements.
What is the purpose of the EXTVCC pin on the LTC3890MPGN-3#TRPBF?
The EXTVCC pin on the LTC3890MPGN-3#TRPBF allows the internal 5.1V INTVCC regulator to be powered from an external supply ≥4.7V instead of VIN, improving overall system efficiency. When EXTVCC exceeds 4.7V, the VIN-based LDO shuts off and the EXTVCC LDO activates - enabling efficient use of a downstream 5V rail to power the controller's gate drivers and logic, reducing total power loss.
Does the LTC3890MPGN-3#TRPBF support independent voltage tracking for both outputs?
Yes, the LTC3890MPGN-3#TRPBF provides dedicated TRACK/SS1 and TRACK/SS2 pins for each controller, enabling fully independent soft-start ramping or precise voltage tracking of external supplies. Each pin features an internal 1µA pull-up current and accepts external resistor dividers - allowing coordinated power-up of FPGAs, ASICs, or multi-rail processors without additional sequencing ICs.
LTC3890MPGN-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3890MPGN-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890MPGN-3#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 LTC3890MPGN-3#TRPBF reliable?
The price and inventory of LTC3890MPGN-3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890MPGN-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890MPGN-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890MPGN-3#TRPBF?
LTC3890MPGN-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890MPGN-3#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 LTC3890MPGN-3#TRPBF?
For technical support, including LTC3890MPGN-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890MPGN-3#TRPBF requirements.
6.How does Aetrix verify that LTC3890MPGN-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890MPGN-3#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 LTC3890MPGN-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890MPGN-3#TRPBF?
All LTC3890MPGN-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890MPGN-3#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 LTC3890MPGN-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890MPGN-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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