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Analog Devices Inc. LTC3890HGN-3#TRPBF
- Part No.:
- LTC3890HGN-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890HGN-3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,126
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Product details
Overview
LTC3890HGN-3#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, dual-phase synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages. It supports 4V–60V input, delivers up to 8.5V/3.3V dual outputs, operates with 50µA quiescent current in single-channel sleep mode, and features out-of-phase operation to reduce input ripple. It is used in automotive always-on systems requiring robust thermal performance.
For engineers reviewing the LTC3890HGN-3#TRPBF datasheet, LTC3890HGN-3#TRPBF pinout, LTC3890HGN-3#TRPBF application, or LTC3890HGN-3#TRPBF equivalent, key selection criteria include its 150°C junction-rated SSOP package, phase-lockable 75kHz–850kHz switching frequency, RSENSE/DCR current sensing, and selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous).
Technical Context
The LTC3890HGN-3#TRPBF implements a constant-frequency current-mode architecture with two 180° out-of-phase controllers, minimizing input capacitance requirements and supply-induced noise. Its OPTI-LOOP® compensation enables stable loop response across wide output capacitance and ESR ranges.
It integrates dual gate drivers (TG/BG), internal 5.1V LDO for INTVCC (with EXTVCC switchover at 4.7V), independent TRACK/SS pins for soft-start or voltage tracking, and PGOOD1 monitoring for Channel 1 only. The H-grade variant guarantees operation from –40°C to 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide battery chemistries and intermediate bus voltages including 12V, 24V, and 48V systems. |
| Quiescent Current (1 ch active) | 50µA - extends runtime in battery-powered automotive or portable applications with one channel enabled. |
| Switching Frequency Range | 75kHz to 850kHz - programmable via resistor or PLL-synchronized to external clock for EMI control. |
| Output Voltage Range | 0.8V to 24V - configurable dual outputs (e.g., 3.3V/8.5V) using external feedback dividers. |
| Max Duty Cycle | 99% - enables ultra-low dropout operation near VIN = VOUT, critical for high-efficiency buck conversion in low-VIN scenarios. |
| Junction Temp Range | –40°C to 150°C - H-grade qualification ensures reliability in under-hood automotive and industrial high-temp environments. |
| Current Sensing | RSENSE or DCR - flexible sensing options support precision current limiting and lossless inductor-based designs. |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), RoHS-compliant, 5.6mm × 10.2mm body, 0.635mm pitch. Thermal resistance θJA = 80°C/W. Designed for surface-mount reflow assembly and high-power density layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / current limit control | Voltage sets peak inductor current threshold per channel; directly interfaces with compensation network. |
| VFB1, VFB2 | Feedback input | Monitors output voltage via resistive divider; regulated to 0.800V ±1.2% over temperature. |
| SENSE1+, SENSE2+ | Current sense (+) input | Connects to high-side of sense resistor or DCR network; differential input with common-mode range up to 28V. |
| SENSE1–, SENSE2– | Current sense (–) input | Reference node for current comparator; bias current ≤±1µA enables accurate low-side sensing. |
| PLLIN/MODE | Light-load mode select / sync input | Selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC); accepts external clock for synchronization. |
| RUN1, RUN2 | Digital enable/disable control | Independent shutdown: <1.15V disables Channel 1; <1.20V disables Channel 2; both <0.7V enters ultra-low-IQ shutdown (<14µA). |
| TG1, TG2 | Top gate driver output | Drives high-side N-MOSFET gates with floating swing (SW + 0.5V to SW + INTVCC); tr/tf = 25ns @ 3.3nF. |
| BG1, BG2 | Bottom gate driver output | Drives synchronous rectifier N-MOSFETs from PGND to INTVCC; pull-up/pull-down RON = 2.4Ω / 1.1Ω. |
| PGOOD1 | Power-good indicator | Open-drain output asserting when VFB1 deviates >±10% from target; supports system sequencing and fault reporting. |
| TRACK/SS1, TRACK/SS2 | Soft-start / tracking input | Internal 1µA pull-up charges external capacitor for linear ramp; also accepts external voltage divider for output tracking. |
| VIN, PGND, SGND | Main power, power ground, signal ground | VIN supplies internal LDO; PGND carries high di/dt switch currents; SGND must be isolated to prevent noise coupling into error amp. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~30%, enabling smaller input capacitors and lower EMI filter cost. |
| OPTI-LOOP® compensation | Allows stable loop tuning across wide output capacitor types (ceramic, polymer, electrolytic) and ESR values without redesign. |
| Low-IQ sleep mode | 50µA (one channel active) and 60µA (both active) extend battery life in always-on telematics or ADAS modules. |
| 99% duty cycle operation | Enables regulation down to VOUT ≈ VIN – 0.3V, critical for high-efficiency conversion in low-dropout automotive cold-crank conditions. |
| EXTVCC switchover | Automatically switches INTVCC supply from VIN LDO to external 4.7–14V source, improving efficiency when powering INTVCC from a regulated converter output. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC Dual-Rail Converter |
|---|---|
|
Use Scenario: Powering SoC, DDR memory, and display interface in head-unit with 12V battery input and strict thermal limits. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller delivering 3.3V@5A and 8.5V@3A with out-of-phase switching to minimize input ripple. Use Value: 150°C-rated H-grade operation ensures reliability under hood; 50µA sleep IQ preserves battery during vehicle off-state. |
Use Scenario: Generating isolated 5V and 24V rails from 48V DC distribution bus in factory automation cabinet. IC Role / Device Role / Timing Role: High-voltage step-down controller supporting 4V–60V input, enabling direct use of 48V intermediate bus without pre-regulator. Use Value: Wide VIN range eliminates need for upstream buck; RSENSE/DCR flexibility allows optimal trade-off between accuracy and conduction loss. |
| Battery-Powered Medical Monitor | Distributed Telecom Power System |
|
Use Scenario: Portable ECG device requiring long runtime from Li-ion battery with dual low-noise analog/digital supplies. IC Role / Device Role / Timing Role: Dual-output controller with independent TRACK/SS pins enabling coordinated soft-start and voltage sequencing. Use Value: Selectable light-load modes (Burst/Pulse-Skipping) maintain >85% efficiency at 1mA load, extending clinical usage time. |
Use Scenario: Point-of-load conversion in 5G base station card with tight board space and thermal constraints. IC Role / Device Role / Timing Role: Phase-lockable 850kHz operation synchronizes switching to system clock, reducing beat frequencies and easing EMI compliance. Use Value: 28-pin SSOP footprint supports high-density layout; 99% duty cycle maintains regulation during brownout events on 48V rail. |
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-3#TRPBF | I-grade (–40°C to 125°C), same pinout and electrical specs except junction temp rating. | Suitable for non-under-hood industrial or telecom applications where 150°C operation is not required. | Select when ambient temperature stays below 105°C and cost optimization is prioritized over extended thermal margin. |
| MP2918GL-Z | Monolithic dual buck (integrated MOSFETs), 4.5V–36V input, fixed 500kHz, no PLL sync, lower max VIN. | Targets space-constrained consumer or computing applications; lacks 60V capability and out-of-phase noise reduction. | Choose for simplified BOM and layout where input voltage never exceeds 36V and thermal derating to 150°C is unnecessary. |
Compared with LTC3890IGN-3#TRPBF, the LTC3890HGN-3#TRPBF provides 25°C higher junction temperature margin for under-hood deployment; versus MP2918GL-Z, it offers wider input range, external MOSFET flexibility, and superior input ripple suppression via phase interleaving - critical for high-reliability automotive and industrial systems.
Availability
LTC3890HGN-3#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power rails, battery-powered medical monitors, and distributed telecom power systems requiring stable component supply and long-term lifecycle support.
Supply support for LTC3890HGN-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC3890 family was designed as high-voltage, low-quiescent-current dual-phase controllers for demanding automotive and industrial DC/DC conversion - emphasizing thermal robustness, light-load efficiency, and noise-sensitive system integration.
FAQ
What is the maximum input voltage rating for the LTC3890HGN-3#TRPBF?
The LTC3890HGN-3#TRPBF has an absolute maximum input supply voltage (VIN) of 65V, with a recommended operating range of 4V to 60V. This wide input range supports 12V, 24V, and 48V battery and bus architectures, including automotive cold-crank and industrial transient conditions. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3890HGN-3#TRPBF support phase synchronization to an external clock?
Yes, the LTC3890HGN-3#TRPBF supports external synchronization via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop aligns the rising edge of TG1 to the rising edge of that clock. This feature enables EMI reduction through frequency coordination in multi-converter systems and is fully functional across the 75kHz–850kHz range.
How does the LTC3890HGN-3#TRPBF achieve low quiescent current in battery-powered applications?
The LTC3890HGN-3#TRPBF achieves 50µA quiescent current with one channel active and 14µA in full shutdown by integrating sleep-mode circuitry that disconnects the error amplifier and disables gate drivers while retaining soft-start state. This low-IQ behavior is guaranteed over the full –40°C to 150°C junction range, making LTC3890HGN-3#TRPBF ideal for automotive always-on modules.
What is the function of the TRACK/SS pins on the LTC3890HGN-3#TRPBF?
The TRACK/SS1 and TRACK/SS2 pins on the LTC3890HGN-3#TRPBF provide independent soft-start and voltage-tracking capability for each output. An internal 1µA current source ramps an external capacitor to generate a linear voltage ramp, controlling output rise time. Alternatively, connecting a resistor divider from another supply enables precise output tracking during startup - essential for FPGA or processor core/memory sequencing.
Can the LTC3890HGN-3#TRPBF drive both high-side and low-side N-channel MOSFETs?
Yes, the LTC3890HGN-3#TRPBF integrates dual high-current gate drivers: TG1/TG2 for top N-MOSFETs (floating, bootstrapped) and BG1/BG2 for bottom N-MOSFETs (ground-referenced). Each driver supports 2.5Ω pull-up / 1.5Ω pull-down (TG) and 2.4Ω / 1.1Ω (BG), enabling efficient switching of discrete MOSFETs in synchronous buck configurations without external drivers.
LTC3890HGN-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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3890HGN-3#TRPBF FAQ
1.How can I place an order for LTC3890HGN-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890HGN-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 LTC3890HGN-3#TRPBF reliable?
The price and inventory of LTC3890HGN-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 LTC3890HGN-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890HGN-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890HGN-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890HGN-3#TRPBF?
LTC3890HGN-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890HGN-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 LTC3890HGN-3#TRPBF?
For technical support, including LTC3890HGN-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890HGN-3#TRPBF requirements.
6.How does Aetrix verify that LTC3890HGN-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890HGN-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 LTC3890HGN-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890HGN-3#TRPBF?
All LTC3890HGN-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890HGN-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 LTC3890HGN-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890HGN-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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