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Analog Devices Inc. LTC3890EUH-2#TRPBF
- Part No.:
- LTC3890EUH-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3890EUH-2#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/SEPIC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,971
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Product details
Overview
LTC3890EUH-2#TRPBF from Analog Devices is a 60V input, dual-phase synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages. It delivers 8.5V/3.3V outputs with 50µA quiescent current (one channel active), 0.8V–24V adjustable output range, and out-of-phase operation to reduce input ripple-ideal for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3890EUH-2#TRPBF datasheet, LTC3890EUH-2#TRPBF pinout, LTC3890EUH-2#TRPBF application, or LTC3890EUH-2#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, dual-channel phase-lockable frequency (75kHz–850kHz), RSENSE/DCR current sensing, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and 5mm × 5mm QFN package with exposed thermal pad.
Technical Context
The LTC3890EUH-2#TRPBF implements constant-frequency current-mode control with independent error amplifiers (ITH1/ITH2) and dual differential current comparators referenced to SENSE1±/SENSE2±. Its OPTI-LOOP® compensation supports wide output capacitance and ESR ranges, while the 180° out-of-phase operation between channels minimizes input capacitor RMS current and power supply noise.
It features dual independent RUN pins (1.15V/1.20V thresholds), programmable current limit via ILIM pin (GND/FLOAT/INTVCC), and flexible startup control through TRACK/SS1 and TRACK/SS2 pins enabling soft-start or voltage tracking. The internal 5.1V INTVCC LDO can be powered from VIN or an external EXTVCC source ≥4.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V battery buses and intermediate industrial rails without pre-regulation. |
| IQ (Sleep Mode) | 50µA (one channel on) - extends runtime in always-on automotive modules and portable instrumentation. |
| VOUT Range | 0.8V to 24V - enables generation of logic, analog, and interface rails from single high-voltage source. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and compact magnetics design across applications. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation near VIN = VOUT, critical for cold-crank automotive conditions. |
| Current Sensing | RSENSE or DCR - provides flexibility for precision shunt-based or lossless inductor-based current monitoring. |
| Temp Range | –40°C to +125°C (junction) - qualified per AEC-Q100 Grade E for under-hood and infotainment systems. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) input | Reference node for current comparator; supplies bias current when > INTVCC – 0.5V. |
| FREQ (2) | Oscillator frequency programming | Resistor-to-GND sets 50–900kHz; tied to GND/INTVCC selects fixed 350/535kHz. |
| PHASMD (3) | Phase relationship selector | Configures TG2/CLKOUT phase offset vs TG1: 180°/60° (GND), 240°/120° (INTVCC), or 180°/90° (float). |
| CLKOUT (4) | Master clock output | INTVCC-rail-swing signal for daisy-chaining additional controllers in multiphase systems. |
| PLLIN/MODE (5) | Synchronization & light-load mode control | Accepts external clock for PLL sync; selects Burst (GND/floating), Continuous (INTVCC), or Pulse-Skipping (1.2V–INTVCC–1.3V). |
| SGND (6, 33) | Small-signal ground reference | Must be routed separately from PGND; exposed pad (33) is SGND and must be soldered to PCB ground. |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Shuts down individual controller below 1.15V/1.20V; both < 0.7V enters full shutdown (<14µA IQ). |
| BOOST1 / BOOST2 (17, 24) | Top-gate bootstrap supply | Provides floating bias for TG drivers; swings from INTVCC to (VIN + INTVCC); requires external bootstrap cap + Schottky diode. |
| TG1 / TG2 (15, 26) | Top N-MOSFET gate drive | High-current floating driver output; voltage swing = INTVCC – 0.5V superimposed on SW node. |
| SW1 / SW2 (16, 25) | Switch node connection | Connects to inductor high-side; forms switching node with TG/BG and BOOST caps. |
| BG1 / BG2 (18, 23) | Bottom N-MOSFET gate drive | High-current driver referenced to PGND; swings from 0V to INTVCC. |
| PGND (21) | Power ground return | Return path for bottom MOSFET sources and CIN(–); must be low-inductance connection to minimize noise. |
| VIN (22) | Main input supply | Primary power rail (4–60V); powers internal LDO and gate drivers unless EXTVCC is active. |
| EXTVCC (20) | External INTVCC supply input | Enables bypass of VIN LDO when >4.7V; reduces power loss and heat in high-VIN applications. |
| INTVCC (19) | Internal 5.1V LDO output | Powers control circuitry and gate drivers; requires ≥4.7µF ceramic decoupling to SGND. |
| VFB1 / VFB2 (11, 31) | Feedback voltage input | Compares output divider voltage to 0.800V reference; ±10% trip point for PGOOD assertion. |
| ITH1 / ITH2 (12, 30) | Error amplifier output | Controls peak inductor current; higher voltage increases current limit and loop gain. |
| TRACK/SS1 / TRACK/SS2 (13, 29) | Soft-start & tracking control | Internal 1µA pull-up; capacitor to ground sets ramp time; resistor divider enables output tracking. |
| ILIM (28) | Current limit threshold select | GND/FLOAT/INTVCC configures max sense voltage to 22/43/64mV - sets overcurrent protection level. |
| PGOOD1 / PGOOD2 (14, 27) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from regulation; includes 25µs fault delay and hysteresis. |
| SENSE1+ / SENSE2+ (10, 32) | Differential current sense (+) input | Connects to shunt resistor or DCR network; common-mode range supports ground-referenced sensing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Rated for automotive use (–40°C to +125°C junction), supporting reliability-critical infotainment and ADAS subsystems. |
| Out-of-Phase Dual Control | Reduces input capacitor RMS current by ~30% and lowers conducted EMI compared to in-phase operation. |
| OPTI-LOOP® Compensation | Enables stable loop response across diverse output capacitors (ceramic, polymer, electrolytic) and ESR values. |
| Programmable Light-Load Mode | Selectable Burst Mode (50µA IQ), Pulse-Skipping, or Forced Continuous - balances efficiency vs. output ripple. |
| 99% Duty Cycle Operation | Maintains regulation during deep dropout (e.g., 12V cold-crank down to 6V), avoiding brownout in automotive systems. |
| Independent Channel Control | Separate RUN, TRACK/SS, PGOOD, and current limit configuration per channel enables asymmetric power rail sequencing. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 3.3V microcontroller, 8.5V display backlight, and 5V USB interface in head-unit under 12V/24V battery input with cold-crank tolerance. IC Role / Device Role / Timing Role: Dual-output synchronous buck controller managing two independent regulated rails with precise sequencing and fault reporting. Use Value: AEC-Q100 qualification ensures reliability; 99% duty cycle maintains 8.5V output during 6V cold-crank; PGOOD1/PGOOD2 enable system-level power health monitoring. |
Use Scenario: Generating isolated 3.3V logic and 8.5V analog sensor excitation from 24V industrial bus in space-constrained DIN-rail mount enclosure. IC Role / Device Role / Timing Role: High-efficiency dual-phase controller delivering tightly regulated outputs with minimal input ripple and thermal footprint. Use Value: Out-of-phase operation cuts input capacitor size by 40%; RSENSE/DCR flexibility accommodates legacy PCB layouts; 5mm × 5mm QFN fits dense I/O board real estate. |
| Battery-Powered Test Equipment | Distributed Telecom Power |
|
Use Scenario: Portable oscilloscope requiring ultra-low standby power, fast wake-up, and clean 3.3V/8.5V rails from Li-ion (8.4V–12.6V) pack. IC Role / Device Role / Timing Role: Low-IQ dual controller enabling multi-rail power management with independent soft-start and shutdown control. Use Value: 50µA sleep current extends battery life; TRACK/SS pins allow coordinated ramp-up of analog and digital domains; Burst Mode maintains <15mV ripple at µA loads. |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying 3.3V FPGA core and 8.5V transceiver bias in fan-cooled chassis. IC Role / Device Role / Timing Role: High-input-voltage dual controller operating at 400kHz to balance efficiency, size, and EMI compliance. Use Value: Phase-lockable frequency synchronizes with system clock to suppress beat frequencies; EXTVCC option powers INTVCC from local 5V rail, improving overall system efficiency. |
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 |
|---|---|---|---|
| LTC3891EUH#TRPBF | Single-output version with identical VIN range, IQ, and feature set; lacks second channel and PGOOD2/ILIM pins. | Used where only one regulated rail is needed; cannot replace dual-rail functionality of LTC3890EUH-2#TRPBF. | Select LTC3891 when system requires only one high-efficiency buck stage and board area is constrained. |
| MP8770GQ-Z | Monolithic dual buck (integrated MOSFETs); 4.5–36V input; 500kHz fixed freq; no phase-sync or EXTVCC support. | Lower BOM count but limited to ≤36V input and fixed frequency; unsuitable for 48V/60V automotive or industrial rails. | Choose MP8770GQ-Z for cost-sensitive, lower-voltage applications where integration outweighs flexibility needs. |
Compared with LTC3891EUH#TRPBF and MP8770GQ-Z, the LTC3890EUH-2#TRPBF uniquely combines 60V input capability, dual independent channels with phase control, AEC-Q100 qualification, and EXTVCC flexibility-making it the only viable option for high-reliability, multi-rail automotive and industrial systems requiring extended input range and precise power sequencing.
Availability
LTC3890EUH-2#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, battery-powered test equipment, and distributed telecom power supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3890EUH-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3890EUH-2#TRPBF belongs to the LTC® high-voltage controller product line, designed specifically for robust, efficient, and flexible power conversion in demanding automotive and industrial environments where input voltage extremes and reliability are critical.
FAQ
What is the maximum input voltage rating for the LTC3890EUH-2#TRPBF?
The LTC3890EUH-2#TRPBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 4V to 60V. This wide input range supports 12V, 24V, and 48V battery and industrial bus architectures, including automotive cold-crank and load-dump transients when properly clamped externally.
Does the LTC3890EUH-2#TRPBF support synchronization to an external clock?
Yes, the LTC3890EUH-2#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop aligns the rising edge of TG1 with the rising edge of that clock, enabling deterministic timing across multiple converters in noise-sensitive or EMI-constrained systems.
How does the ILIM pin affect current limiting on the LTC3890EUH-2#TRPBF?
The ILIM pin on the LTC3890EUH-2#TRPBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This directly sets the peak inductor current trip point for both channels, allowing scalable overcurrent protection without changing sense resistor values.
Can the LTC3890EUH-2#TRPBF operate with only one channel enabled?
Yes, the LTC3890EUH-2#TRPBF supports independent channel operation. Pulling RUN1 high and RUN2 low disables Channel 2 while keeping Channel 1 fully functional-including its dedicated PGOOD2, TRACK/SS2, and current limit settings-enabling flexible partial-power configurations.
What thermal considerations apply to the LTC3890EUH-2#TRPBF's exposed pad?
The exposed pad (Pin 33) of the LTC3890EUH-2#TRPBF is electrically and thermally connected to SGND and must be soldered to a PCB copper pour for effective heat dissipation. Failure to do so degrades thermal performance, increasing junction temperature and potentially violating the –40°C to +125°C operating range specification.
LTC3890EUH-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- 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, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3890EUH-2#TRPBF FAQ
1.How can I place an order for LTC3890EUH-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890EUH-2#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 LTC3890EUH-2#TRPBF reliable?
The price and inventory of LTC3890EUH-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3890EUH-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3890EUH-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890EUH-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890EUH-2#TRPBF?
LTC3890EUH-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890EUH-2#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 LTC3890EUH-2#TRPBF?
For technical support, including LTC3890EUH-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890EUH-2#TRPBF requirements.
6.How does Aetrix verify that LTC3890EUH-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3890EUH-2#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 LTC3890EUH-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3890EUH-2#TRPBF?
All LTC3890EUH-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890EUH-2#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 LTC3890EUH-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3890EUH-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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