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Analog Devices Inc. LTC3826EUH#TRPBF
- Part No.:
- LTC3826EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3826EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
LTC3826EUH#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching controller driving two independent N-channel MOSFET stages. It delivers 30μA no-load quiescent current, ±1% output voltage accuracy, and operates across 4V–36V input with 0.8V–10V adjustable outputs - ideal for automotive power rails and battery-powered digital systems requiring high efficiency at light loads.
For engineers reviewing the LTC3826EUH#TRPBF datasheet, LTC3826EUH#TRPBF pinout, LTC3826EUH#TRPBF application, or LTC3826EUH#TRPBF equivalent, key selection criteria include out-of-phase dual-channel operation to reduce input capacitance, OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, selectable Burst Mode®/pulse-skipping/continuous conduction, and integrated power-good monitoring with foldback current limiting.
Technical Context
The LTC3826EUH#TRPBF implements a constant-frequency current-mode architecture with two 180° out-of-phase controllers, enabling phase-lockable operation from 140kHz to 650kHz. Its dual independent error amplifiers (ITH1/ITH2), differential current sense inputs (SENSE1±/SENSE2±), and precision 0.8V reference support tight regulation across varying load and line conditions.
It integrates internal LDOs powering gate drivers from either VIN or EXTVCC (4.7V–10V), supports soft-start/tracking via dedicated TRACK/SS pins, and includes dedicated shutdown (RUN1/RUN2), overvoltage protection (PGOOD1/PGOOD2), and foldback disable (FOLDDIS) - all in a thermally enhanced 5mm × 5mm QFN package with exposed SGND pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and wide-input industrial supplies. |
| Quiescent Current (One Channel On) | 30μA - extends runtime in always-on battery systems without compromising startup behavior. |
| Output Voltage Accuracy | ±1% - ensures stable core logic or memory rail regulation under temperature and load variation. |
| Switching Frequency Range | 140kHz to 650kHz - balances efficiency vs. size; supports external synchronization via PLLIN/MODE. |
| Reference Voltage | 0.800V ±0.8% - enables precise low-voltage output setting with minimal resistor divider error. |
| Max Duty Cycle | 99.4% - sustains regulation during deep dropout (e.g., 5V-in → 4.9V-out), critical for low-VIN applications. |
| Shutdown Current | 4μA - minimizes system standby loss when both channels are disabled. |
| Operating Temperature | –40°C to +85°C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed SGND pad (Pin 33), requiring soldering to PCB ground for thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) | Connects to low-side of sense resistor; sets current limit threshold with SENSE+. |
| PLLIN/MODE (5) | Mode selection & sync input | Selects Burst Mode® (≤0.7V), pulse skipping (0.9V–INTVCC–1.2V), or forced continuous (INTVCC); accepts external clock. |
| SGND (6, 33) | Small-signal ground | Reference for feedback, error amp, and logic; exposed pad must be soldered to PCB ground plane. |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Pull below 0.7V to disable respective controller; both low → full shutdown (4μA IQ). |
| INTVCC (19) | Internal LDO output | Supplies gate drivers and control circuitry; sourced from VIN (5.25V) or EXTVCC (7.5V) depending on voltage. |
| EXTVCC (20) | External bias input | Enables higher-efficiency INTVCC sourcing from a secondary regulator output (≥4.7V, ≤10V). |
| PGOOD1 / PGOOD2 (27, 28) | Open-drain status outputs | Pull low if VFB deviates >±10% from setpoint - used for system power sequencing and fault reporting. |
| TRACK/SS1 / TRACK/SS2 (29, 13) | Soft-start & tracking input | Internal 1μA pull-up charges external cap for controlled ramp; also accepts external voltage for supply tracking. |
| ITH1 / ITH2 (30, 12) | Error amplifier output | Sets peak inductor current; voltage range 0.425V–1.2V defines current limit and transient response. |
| VFB1 / VFB2 (31, 11) | Feedback input | Compares resistive divider output to 0.8V reference; ±1% accuracy maintained over temp and line. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~30%, cutting required input capacitance and EMI filter size. |
| OPTI-LOOP® compensation | Allows stable loop response across 10μF–1000μF output capacitors with ESR from 1mΩ–100mΩ. |
| Selectably optimized light-load modes | Burst Mode® (30μA IQ), pulse skipping (low ripple), or forced continuous (audio-noise sensitive apps). |
| Dual independent soft-start/tracking | Prevents inrush current and enables coordinated power-up with other rails using external resistor dividers. |
| Foldback current limiting | Reduces MOSFET thermal stress during short-circuit by lowering peak current as VOUT collapses. |
| Integrated power-good monitoring | Two independent open-drain outputs simplify system-level power sequencing and fault detection. |
Applications
| Automotive Infotainment Power Supply | Portable Medical Instrument DC-DC Stage |
|---|---|
Use Scenario: Dual-rail generation (3.3V @ 5A + 8.5V @ 3.5A) for SoC, display, and audio subsystems in vehicle head units. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent voltage domains with coordinated soft-start and power-good signaling. Use Value: 30μA quiescent current preserves battery life during ignition-off; out-of-phase operation reduces bulk capacitor count by 40% versus single-phase designs. | Use Scenario: Battery-backed 5V-to-3.3V/2.5V conversion in handheld diagnostic devices requiring long shelf life and low EMI. IC Role / Device Role / Timing Role: High-efficiency step-down controller enabling Burst Mode® operation to sustain microamp-level standby current while maintaining fast wake-up response. Use Value: ±1% output accuracy ensures sensor ADC reference stability; 4V–36V input range accommodates 3S Li-ion (9–12.6V) and 24V auxiliary inputs. |
| Industrial PLC Distributed Power System | Test Equipment Dual-Channel Bias Supply |
Use Scenario: Local regulation of 5V and 12V rails from a 24V backplane in modular I/O modules with strict thermal limits. IC Role / Device Role / Timing Role: Dual-output controller with independent RUN pins enabling dynamic rail enable/disable and thermal derating per channel. Use Value: 99.4% max duty cycle maintains regulation during brownout; EXTVCC input allows efficient use of existing 5V rail to power gate drivers. | Use Scenario: Precision dual-output bench supply (±0.5% setpoint) for analog circuit characterization with low-noise, low-ripple requirements. IC Role / Device Role / Timing Role: Synchronous buck controller operating in forced continuous mode to eliminate low-frequency switching artifacts in sensitive analog measurements. Use Value: Pulse-skipping mode provides <10mVpp ripple at 10% load - 3× lower than Burst Mode® - while retaining >85% efficiency. |
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 |
|---|---|---|---|
| LTC3855IUFD#PBF | Single-channel, 4V–38V input, 0.6V ref, 35μA IQ, no PLL sync, 3mm × 4mm DFN | Lower integration (single output), smaller footprint, no phase synchronization capability | Select when only one regulated rail is needed and board space is constrained. |
| MP8772GQ-Z | Dual-channel, 4.5V–36V input, 0.6V ref, 45μA IQ, fixed 500kHz, no TRACK/SS or PLL | Lacks soft-start tracking, external sync, and foldback limiting; lower accuracy (±1.5%) | Choose for cost-sensitive industrial applications where Burst Mode® and precision tracking are non-critical. |
Compared with LTC3855IUFD#PBF and MP8772GQ-Z, the LTC3826EUH#TRPBF uniquely combines dual independent controllers with phase synchronization, OPTI-LOOP® adaptability, and sub-50μA quiescent current - making it optimal for multi-rail battery systems demanding both efficiency and sequencing control.
Availability
LTC3826EUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, portable medical instrumentation, and industrial PLC distributed power systems requiring stable component supply, long-lifecycle availability, and guaranteed parametric compliance.
Supply support for LTC3826EUH#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 its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3826EUH#TRPBF belongs to Linear's high-efficiency synchronous controller family, designed specifically for multi-rail, low-quiescent-current DC-DC conversion in battery-powered and automotive environments.
FAQ
What is the minimum input voltage for reliable operation of the LTC3826EUH#TRPBF?
The LTC3826EUH#TRPBF has an undervoltage lockout (UVLO) threshold of 3.7V (typical), with guaranteed operation down to 4V. Below 3.7V, both controllers disable and the device enters shutdown, drawing only 4μA. The LTC3826EUH#TRPBF resumes normal operation once VIN rises above 4V, ensuring robust start-up from partially discharged batteries.
How does the OPTI-LOOP® compensation in the LTC3826EUH#TRPBF improve design flexibility?
OPTI-LOOP® compensation in the LTC3826EUH#TRPBF dynamically adjusts loop gain based on output capacitor ESR and value, allowing stable operation with ceramic, polymer, or electrolytic capacitors ranging from 10μF to 1000μF and ESR from 1mΩ to 100mΩ. This eliminates manual compensation network redesign when changing output caps - a key advantage over fixed-compensation controllers like the LTC3855.
Can the LTC3826EUH#TRPBF drive MOSFETs directly without external drivers?
Yes - the LTC3826EUH#TRPBF integrates high-current gate drivers: TG1/TG2 (top-side, floating) and BG1/BG2 (bottom-side, grounded), each capable of 3A peak sink/source. It directly drives standard N-channel MOSFETs up to 30nC gate charge at full switching frequency, eliminating need for external drivers in most medium-power applications (≤10A per phase).
What is the function of the FOLDDIS pin on the LTC3826EUH#TRPBF, and when should it be used?
The FOLDDIS pin (Pin 14) disables foldback current limiting when driven high to INTVCC. Use FOLDDIS to maintain constant peak current during short-circuit events where thermal derating is managed externally (e.g., via heatsink or airflow), avoiding premature current reduction that could delay fault clearing. Leave FOLDDIS unconnected or grounded to retain default foldback protection.
Does the LTC3826EUH#TRPBF support output voltage tracking between its two channels?
No - the LTC3826EUH#TRPBF supports independent tracking of each output to an external voltage source (e.g., another regulator's output), but not direct channel-to-channel tracking. TRACK/SS1 and TRACK/SS2 are separate pins; coordinating ramp rates requires identical external RC networks or shared reference dividers - not internal coupling. For true master-slave tracking, consider the LTC3857 or discrete sequencing ICs.
LTC3826EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- 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 ~ 36V
- Frequency - Switching:
- 250kHz ~ 530kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3826EUH#TRPBF FAQ
1.How can I place an order for LTC3826EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3826EUH#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 LTC3826EUH#TRPBF reliable?
The price and inventory of LTC3826EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3826EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3826EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3826EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3826EUH#TRPBF?
LTC3826EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3826EUH#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 LTC3826EUH#TRPBF?
For technical support, including LTC3826EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3826EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3826EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3826EUH#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 LTC3826EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3826EUH#TRPBF?
All LTC3826EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3826EUH#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 LTC3826EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3826EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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