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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC3890EGN-1#PBF

Name: LTC3890EGN-1#PBF
Brand: Analog Devices Inc.
SKU: LTC3890EGN-1#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3890EGN-1#PBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 28-SSOP (0.154", 3.90mm Width)

Datasheet:: LTC3890EGN-1#PBF.pdf

Description:: IC REG CTRLR BUCK 28SSOP

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Product details

Overview

LTC3890EGN-1#PBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. It supports 4V–60V input, delivers two independent outputs (e.g., 3.3V/5A and 8.5V/3A), 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 LTC3890EGN-1#PBF datasheet, LTC3890EGN-1#PBF pinout, LTC3890EGN-1#PBF application, or LTC3890EGN-1#PBF equivalent, key selection criteria include its 28-pin SSOP package, dual-channel phase-lockable frequency (75–850kHz), RSENSE/DCR current sensing, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and integrated 5.1V INTVCC LDO powered from VIN or EXTVCC.

Technical Context

The LTC3890EGN-1#PBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize input capacitor requirements and supply-induced noise. Each channel uses an error amplifier (EA) with OPTI-LOOP® compensation, a transconductance gm of 2 mmho, and programmable current limit via ITH voltage control.

Its dual-stage gate drivers support high-side (TG1/TG2) and low-side (BG1/BG2) N-MOSFETs with 2.5Ω pull-up / 1.5Ω pull-down on TG and 2.4Ω / 1.1Ω on BG, enabling efficient switching at up to 850kHz. The device integrates undervoltage lockout (3.8V typical), output overvoltage protection (±10% PGOOD trip), and dropout detection that forces periodic top-FET off-time to recharge bootstrap capacitors during 99% duty-cycle operation.

Key Specifications

Parameter	Value and Actual Design Meaning
VIN Range	4V to 60V - supports wide battery chemistries (12V/24V/48V systems) and intermediate bus voltages without external pre-regulation.
I_Q (Sleep, 1 ch)	50µA - extends runtime in always-on automotive modules and portable instrumentation where one rail remains active.
V_FB Accuracy	±0.8% (0.792V–0.812V) - ensures tight output regulation across temperature and load, critical for powering sensitive ADCs or FPGAs.
f_SYNC	75kHz to 850kHz - enables EMI reduction via spread-spectrum synchronization or fixed-frequency layout optimization.
Duty Cycle Max	99% - sustains regulation down to V_OUT ≈ V_IN – 0.3V, essential for high-input, low-output applications like 48V-to-3.3V conversion.
Current Sense	RSENSE or DCR - eliminates need for dedicated sense resistors in high-current designs, reducing power loss and board area.
PGOOD Output	Open-drain, ±10% trip with 2.5% hysteresis - provides reliable power sequencing feedback for microcontrollers and FPGA configuration logic.

Pinout & Package

Package: 28-lead plastic SSOP (GN), 5.6mm × 10.2mm, 0.635mm pitch, rated for –40°C to 125°C junction temperature.

Pin/Terminal	Circuit Role	Design Meaning
ITH1, ITH2	Error amplifier output / current limit control	Directly sets peak inductor current threshold; voltage ramp controls soft-start and current foldback behavior.
VFB1, VFB2	Feedback input	Compares output voltage (via resistor divider) to 0.8V internal reference; accuracy determines output regulation tolerance.
SENSE1+, SENSE1− SENSE2+, SENSE2−	Differential current sense inputs	Supports Kelvin-connected shunt resistors or DCR networks; common-mode range up to 28V enables high-side sensing.
PLLIN/MODE	Light-load mode select / sync input	Selects Burst Mode (ground), Pulse-Skipping (1.2V–INTVCC–1.3V), or Continuous (INTVCC); accepts external clock for phase locking.
RUN1, RUN2	Independent enable inputs	Logic-level shutdown: <1.15V disables channel; both <0.7V enters ultra-low-I_Q shutdown (<14µA).
TG1, TG2 BG1, BG2	High-side / low-side gate drivers	Drive N-MOSFETs with fast 25ns rise/fall times; TG swing = SW + (INTVCC – 0.5V), BG swing = GND to INTVCC.
INTVCC, EXTVCC	Internal LDO output / external bias input	5.1V ±3%, sourced from VIN (via internal LDO) or external supply >4.7V; reduces self-heating and improves efficiency.
TRACK/SS1, TRACK/SS2	Soft-start / tracking input	Internal 1µA pull-up charges external capacitor for linear voltage ramp; also accepts resistor divider for output tracking.

Key Features

Feature	Design Value
Out-of-phase dual controllers	Reduces RMS input current by ~30% and cuts required input capacitance nearly in half versus in-phase operation.
OPTI-LOOP® compensation	Enables stable loop response across wide ranges of output capacitance (10µF–10,000µF) and ESR (0.5mΩ–100mΩ) without redesign.
Programmable light-load mode	Three selectable modes optimize trade-off: Burst Mode (max efficiency <100mA), Pulse-Skipping (low ripple), or Continuous (lowest noise).
99% duty cycle dropout operation	Maintains regulation when V_IN drops near V_OUT, with automatic bootstrap refresh to prevent gate drive collapse.
Independent TRACK/SS pins	Enable per-channel soft-start timing or precise voltage tracking between rails (e.g., core vs. I/O supply sequencing).

Applications

Automotive Infotainment Power	Industrial PLC I/O Module
Use Scenario: Powering SoC cores (1.2V), DDR memory (1.35V), and display interfaces (3.3V/5V) from 12V battery with cold-crank immunity. IC Role / Device Role / Timing Role: Dual-channel controller generating tightly regulated, sequenced outputs with independent soft-start and PGOOD monitoring. Use Value: 50µA I_Q preserves battery during vehicle sleep; 60V abs max rating withstands load-dump transients up to 65V.	Use Scenario: Providing isolated 24V field power and 5V logic rails in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering stable 24V/3A and 5V/5A outputs from 48V backplane with minimal heat dissipation. Use Value: RSENSE/DCR sensing avoids power loss in shunt resistors; 125°C temp grade ensures reliability in enclosed enclosures.
Battery-Powered Test Equipment	Distributed Telecom Power
Use Scenario: Portable oscilloscope or spectrum analyzer requiring low-noise analog rails (±5V, 3.3V) and clean digital supplies from Li-ion pack (8–26V). IC Role / Device Role / Timing Role: Dual synchronous controller with selectable light-load modes to balance battery life and output ripple performance. Use Value: Pulse-skipping mode maintains <15mVpp ripple at light loads while achieving >85% efficiency at 10mA output.	Use Scenario: Intermediate 12V distribution rail generation in 48V telecom systems feeding multiple point-of-load converters. IC Role / Device Role / Timing Role: High-input-voltage step-down controller delivering 12V/10A with phase interleaving to reduce EMI and input cap stress. Use Value: Out-of-phase operation cuts input ripple current amplitude by 50%, allowing smaller ceramic input capacitors and lower ESL design.

Automotive Infotainment Power

Industrial PLC I/O Module

Use Scenario: Powering SoC cores (1.2V), DDR memory (1.35V), and display interfaces (3.3V/5V) from 12V battery with cold-crank immunity.

IC Role / Device Role / Timing Role: Dual-channel controller generating tightly regulated, sequenced outputs with independent soft-start and PGOOD monitoring.

Use Value: 50µA I_Q preserves battery during vehicle sleep; 60V abs max rating withstands load-dump transients up to 65V.

Use Scenario: Providing isolated 24V field power and 5V logic rails in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: High-efficiency buck controller delivering stable 24V/3A and 5V/5A outputs from 48V backplane with minimal heat dissipation.

Use Value: RSENSE/DCR sensing avoids power loss in shunt resistors; 125°C temp grade ensures reliability in enclosed enclosures.

Battery-Powered Test Equipment

Distributed Telecom Power

Use Scenario: Portable oscilloscope or spectrum analyzer requiring low-noise analog rails (±5V, 3.3V) and clean digital supplies from Li-ion pack (8–26V).

IC Role / Device Role / Timing Role: Dual synchronous controller with selectable light-load modes to balance battery life and output ripple performance.

Use Value: Pulse-skipping mode maintains <15mVpp ripple at light loads while achieving >85% efficiency at 10mA output.

Use Scenario: Intermediate 12V distribution rail generation in 48V telecom systems feeding multiple point-of-load converters.

IC Role / Device Role / Timing Role: High-input-voltage step-down controller delivering 12V/10A with phase interleaving to reduce EMI and input cap stress.

Use Value: Out-of-phase operation cuts input ripple current amplitude by 50%, allowing smaller ceramic input capacitors and lower ESL design.

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
LTC3890IGN-1#PBF	Identical electrical specs; rated for –40°C to 125°C industrial temp range (same package, same pinout).	No difference in circuit function; selected when extended temp validation or traceability to industrial-grade screening is required.	Choose LTC3890IGN-1#PBF for applications requiring guaranteed performance across full –40°C to 125°C range with production test coverage.
MP2918GL-Z	Single-chip dual-phase controller with integrated MOSFET drivers only (no external FET support); max VIN = 28V; no EXTVCC option.	Suitable for space-constrained, lower-power (<6A/channel) applications where integration outweighs input voltage flexibility.	Choose MP2918GL-Z only if input voltage stays below 28V and board area is critical-LTC3890EGN-1#PBF offers higher VIN, external FET control, and EXTVCC efficiency boost.

Compared with LTC3890IGN-1#PBF, the LTC3890EGN-1#PBF shares identical functionality but is specified for commercial-grade temperature testing; versus MP2918GL-Z, it provides wider 4V–60V operation, external MOSFET flexibility, and superior light-load efficiency via Burst Mode-making it optimal for automotive and industrial high-VIN systems.

Availability

LTC3890EGN-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and battery-operated test equipment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LTC3890EGN-1#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.

The LTC3890 family was designed for high-reliability, wide-input-voltage DC/DC control in automotive, industrial, and telecom infrastructure-emphasizing ultra-low quiescent current, robust fault protection, and flexible multi-rail power sequencing.

FAQ

What is the maximum input voltage rating for the LTC3890EGN-1#PBF?

The LTC3890EGN-1#PBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 4V to 60V. This allows direct connection to 48V industrial buses and automotive batteries including load-dump transients. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.

Does the LTC3890EGN-1#PBF support external synchronization of switching frequency?

Yes, the LTC3890EGN-1#PBF supports external synchronization via the PLLIN/MODE pin, accepting clock signals from 75kHz to 850kHz. When an external clock is applied, the internal phase-locked loop aligns the rising edge of TG1 to the external clock's rising edge-enabling EMI reduction and multi-converter coordination without modifying the LTC3890EGN-1#PBF's internal oscillator.

How does the LTC3890EGN-1#PBF achieve 50µA quiescent current?

The LTC3890EGN-1#PBF achieves 50µA quiescent current by entering Sleep Mode when one channel is active and lightly loaded: the error amplifier disconnects from ITH, internal bias currents are gated, and gate drivers idle. This state is triggered automatically when ITH drops below 0.425V-ensuring minimal battery drain in always-on automotive modules powered by the LTC3890EGN-1#PBF.

Can the LTC3890EGN-1#PBF drive both high-side and low-side N-channel MOSFETs?

Yes, the LTC3890EGN-1#PBF integrates dual high-current gate drivers for both high-side (TG1/TG2) and low-side (BG1/BG2) N-channel MOSFETs. TG outputs swing from SW node + (INTVCC – 0.5V), while BG outputs swing from PGND to INTVCC-enabling fully synchronous rectification with optimal efficiency and thermal performance in each channel of the LTC3890EGN-1#PBF.

What is the purpose of the EXTVCC pin on the LTC3890EGN-1#PBF?

The EXTVCC pin on the LTC3890EGN-1#PBF allows the internal 5.1V INTVCC LDO to be powered from an external supply (≥4.7V) instead of VIN, improving system efficiency by avoiding linear regulation losses. When EXTVCC exceeds 4.7V, the VIN-based LDO shuts off and the EXTVCC-based LDO activates-making it ideal to tie EXTVCC to a clean, efficient 5V or 12V rail generated by another LTC3890EGN-1#PBF channel or upstream converter.

LTC3890EGN-1#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

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:: Enable, Frequency Control, Power Good, Soft Start, Tracking

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SSOP

LTC3890EGN-1#PBF FAQ

1.How can I place an order for LTC3890EGN-1#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3890EGN-1#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 LTC3890EGN-1#PBF reliable?

The price and inventory of LTC3890EGN-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890EGN-1#PBF is usually 5 days.

3.What payment methods are accepted for LTC3890EGN-1#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890EGN-1#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3890EGN-1#PBF?

LTC3890EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3890EGN-1#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 LTC3890EGN-1#PBF?

For technical support, including LTC3890EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890EGN-1#PBF requirements.

6.How does Aetrix verify that LTC3890EGN-1#PBF is sourced from the original manufacturer or authorized distributors?

All LTC3890EGN-1#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 LTC3890EGN-1#PBF meets industry standards.

7.What is the process for return or replacement of LTC3890EGN-1#PBF?

All LTC3890EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890EGN-1#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 LTC3890EGN-1#PBF part is unused and in its original packaging.

Return procedure for LTC3890EGN-1#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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