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Analog Devices Inc. LTC3890HGN-1#TRPBF
- Part No.:
- LTC3890HGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890HGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,425
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Product details
Overview
LTC3890HGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance 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 LTC3890HGN-1#TRPBF datasheet, LTC3890HGN-1#TRPBF pinout, LTC3890HGN-1#TRPBF application, or LTC3890HGN-1#TRPBF equivalent, key selection criteria include its 150°C junction-rated SSOP-28 package, phase-lockable 75kHz–850kHz switching frequency, selectable light-load modes (Burst/Pulse-Skipping/Continuous), RSENSE or DCR current sensing, and dual independent TRACK/SS pins for soft-start and voltage tracking.
Technical Context
The LTC3890HGN-1#TRPBF implements a constant-frequency current-mode architecture with two independent 180° out-of-phase controllers, minimizing input capacitance requirements and supply-induced noise. Each channel uses an error amplifier (EA) with OPTI-LOOP® compensation, a transconductance gm of 2 mmho, and a regulated 0.800V feedback reference (±1.2% over temperature).
Its dual gate drivers support synchronous N-MOSFET top/bottom switches with 2.5Ω TG pull-up, 1.5Ω TG pull-down, 2.4Ω BG pull-up, and 1.1Ω BG pull-down on-resistance. The internal INTVCC LDO delivers 5.1V ±3% from VIN or EXTVCC (switchover at 4.7V), enabling efficient self-biasing from output rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input industrial, automotive, and battery chemistries including 12V/24V/48V buses. |
| Quiescent Current | 50µA (one channel active) - extends runtime in always-on battery systems like telematics or ADAS sensors. |
| Output Voltage Range | 0.8V to 24V - enables flexible dual-rail generation (e.g., 3.3V + 8.5V) without external DACs or regulators. |
| Switching Frequency | 75kHz–850kHz (phase-lockable) - allows EMI optimization and inductor size reduction while supporting synchronization to system clocks. |
| Max Duty Cycle | 99% - supports ultra-low dropout operation (e.g., 12V→11.5V) critical in high-voltage input, low-VOUT applications. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and industrial environments requiring extended thermal robustness. |
| Current Sense | RSENSE or DCR - eliminates need for dedicated sense resistors in high-current designs, reducing power loss and board area. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 5.6mm × 10.2mm, 0.635mm pitch, rated for –40°C to +150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / compensation node | Controls peak inductor current per channel; connects to RC network for loop stability tuning. |
| VFB1, VFB2 | Feedback input | Monitors output via resistor divider; regulates to precise 0.800V reference (±1.2%) across temperature. |
| SENSE1+, SENSE1− SENSE2+, SENSE2− | Differential current sense inputs | Supports high-accuracy current limiting using either shunt resistors or DCR networks on power inductors. |
| 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 control | Digital shutdown pins: <1.15V disables one channel; both <0.7V reduces IQ to 14µA for full system standby. |
| TRACK/SS1, TRACK/SS2 | Soft-start and tracking input | Internal 1µA pull-up charges external capacitor for controlled ramp-up; accepts external voltage divider for output tracking. |
| TG1, TG2 BG1, BG2 | Top/bottom gate drivers | Drive N-MOSFET gates with fast 25ns rise/fall times; TG swings from SW node, BG from PGND. |
| BOOST1, BOOST2 | Floating bootstrap supply | Provides gate drive above SW for top MOSFETs; requires external bootstrap capacitor and Schottky diode. |
| PGOOD1 | Open-drain power-good indicator | Asserts low when VFB1 deviates >±10% from regulation - enables sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple by ~70%, cutting required input capacitance and easing EMI filter design. |
| OPTI-LOOP® compensation | Enables stable loop response across wide range of output capacitors (including ceramic) and ESR values without redesign. |
| Low-IQ sleep mode | 50µA (1-channel active) and 60µA (2-channel active) extend battery life in portable and always-on systems. |
| Programmable light-load behavior | Three selectable modes (Burst, Pulse-Skipping, Continuous) let designers trade efficiency vs. ripple/noise per application need. |
| Robust protection suite | Includes output overvoltage protection (VOVL), undervoltage lockout (UVLO), and foldback current limiting during short-circuit events. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC (1.2V core), DDR memory (1.35V), and display interface (3.3V) in head-unit ECUs operating from 9V–16V battery. IC Role / Device Role / Timing Role: Primary dual-phase buck controller managing two independent regulated outputs with precise tracking and sequencing. Use Value: 50µA quiescent current prevents battery drain during vehicle sleep; 150°C rating ensures reliability near engine bay heat sources. | Use Scenario: Distributed 24V-to-5V/3.3V conversion for isolated analog input/output channels in modular programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC controller delivering stable rails across wide ambient temperature swings (–40°C to +85°C). Use Value: Out-of-phase operation minimizes conducted EMI into sensitive analog signal paths; RSENSE/DCR flexibility simplifies current monitoring integration. |
| Battery-Powered Test Equipment | Telecom Remote Radio Unit (RRU) |
Use Scenario: Portable oscilloscope or multimeter requiring long runtime from Li-ion pack (8.4V–12.6V) while powering mixed-signal FPGA, ADC, and LCD backlight. IC Role / Device Role / Timing Role: Dual-output controller generating clean 3.3V for logic and adjustable 5V–12V for backlight with independent soft-start. Use Value: Adjustable light-load mode allows Burst Mode for max battery life or Continuous Mode for low-noise analog performance during measurement. | Use Scenario: Outdoor macro-cell base station RRU converting -48V telecom supply to 12V intermediate bus and 3.3V/1.8V for FPGAs and RF ICs. IC Role / Device Role / Timing Role: High-input-voltage dual controller enabling compact, efficient multi-rail generation in space-constrained outdoor enclosures. Use Value: 60V absolute max input withstands load-dump transients; 150°C rating supports operation in sealed, passively cooled housings. |
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#TRPBF | Same functionality and pinout, but rated for –40°C to +125°C junction temperature (vs. +150°C for H-grade). | Suitable for commercial/industrial environments without extreme thermal stress; lower cost where 150°C is not required. | Select when ambient temperatures remain below 105°C and full automotive under-hood qualification is unnecessary. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only; lacks RSENSE/DCR flexibility, no TRACK/SS pins, and fixed 0.6V reference. | Targets cost-sensitive, space-constrained consumer electronics; no support for precision tracking or wide-VOUT adjustment. | Choose only for simple, low-cost dual-rail needs where external current sensing and soft-start control are not required. |
Compared with LTC3890IGN-1#TRPBF, the LTC3890HGN-1#TRPBF provides extended thermal margin for harsh environments, while MP2918GL-Z trades configurability and precision for integration and BOM simplicity-making the H-grade optimal for automotive and high-reliability industrial use cases.
Availability
LTC3890HGN-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, battery-powered test equipment, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3890HGN-1#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3890 family was designed as a high-efficiency, low-quiescent-current dual-phase synchronous buck controller platform for demanding power management applications in automotive, industrial, and battery-operated systems.
FAQ
What is the maximum input voltage rating for the LTC3890HGN-1#TRPBF?
The LTC3890HGN-1#TRPBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 4V to 60V. This wide input range accommodates 12V, 24V, and 48V industrial and automotive buses, including transient conditions like load dump. Operation beyond 60V risks exceeding safe operating area limits and is not guaranteed.
Does the LTC3890HGN-1#TRPBF support output voltage tracking between its two channels?
Yes, the LTC3890HGN-1#TRPBF supports independent voltage tracking via dedicated TRACK/SS1 and TRACK/SS2 pins. Each pin accepts an external voltage reference (e.g., from another regulator's output) through a resistor divider, allowing the corresponding output to ramp up in precise proportion-critical for FPGA or processor core/I/O rail sequencing. An internal 1µA pull-up enables capacitor-based soft-start when pins are left open.
How does the LTC3890HGN-1#TRPBF achieve low quiescent current in battery-powered applications?
The LTC3890HGN-1#TRPBF achieves 50µA quiescent current with one channel active and 60µA with both active by entering a deep sleep mode when light loads trigger the PLLIN/MODE pin's Burst Mode function. In this state, internal circuitry-including error amplifiers and oscillators-is gated off while maintaining regulation via output capacitance. Shutdown (both RUN pins <0.7V) further reduces IQ to <14µA.
Can the LTC3890HGN-1#TRPBF be synchronized to an external clock source?
Yes, the LTC3890HGN-1#TRPBF supports external synchronization 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 to the external clock's rising edge-enabling noise-sensitive systems (e.g., audio, RF) to avoid beat frequencies. The second channel automatically operates 180° out-of-phase for optimal input ripple cancellation.
What package and temperature grade does the LTC3890HGN-1#TRPBF use?
The LTC3890HGN-1#TRPBF uses a 28-lead plastic SSOP (GN) package and is specified for a junction temperature range of –40°C to +150°C. This H-grade qualification makes it suitable for under-hood automotive applications and high-ambient industrial environments where standard I-grade (–40°C to +125°C) parts may fail prematurely due to thermal stress.
LTC3890HGN-1#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
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3890HGN-1#TRPBF FAQ
1.How can I place an order for LTC3890HGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890HGN-1#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 LTC3890HGN-1#TRPBF reliable?
The price and inventory of LTC3890HGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890HGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890HGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890HGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890HGN-1#TRPBF?
LTC3890HGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890HGN-1#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 LTC3890HGN-1#TRPBF?
For technical support, including LTC3890HGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890HGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3890HGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890HGN-1#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 LTC3890HGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890HGN-1#TRPBF?
All LTC3890HGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890HGN-1#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 LTC3890HGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890HGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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