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Analog Devices Inc. LTC3826EUH#PBF
- Part No.:
- LTC3826EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3826EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,483
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Product details
Overview
LTC3826EUH#PBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching controller driving two independent N-channel MOSFET stages. It delivers 5A at 3.3V and 3.5A at 8.5V with 30μA no-load quiescent current, ±1% output voltage accuracy, and 4V–36V input range-optimized for battery-powered digital systems requiring high efficiency and low standby power.
For engineers reviewing the LTC3826EUH#PBF datasheet, LTC3826EUH#PBF pinout, LTC3826EUH#PBF application, or LTC3826EUH#PBF equivalent, key selection criteria include out-of-phase operation to reduce input capacitance, OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, selectable light-load modes (Burst Mode®, pulse skipping, continuous), and dual independent TRACK/SS pins for coordinated soft-start or voltage tracking.
Technical Context
The LTC3826EUH#PBF 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 dropout detection with 99% duty cycle capability, and features independent RUN1/RUN2 shutdown control, foldback current limiting, and open-drain PGOOD1/PGOOD2 outputs with ±10% trip thresholds referenced to VFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - accommodates 12V automotive, 24V industrial, and multi-cell Li-ion battery inputs without external pre-regulation. |
| No-Load Quiescent Current | 30μA (one channel active) - extends runtime in always-on battery systems such as portable medical monitors or IoT edge nodes. |
| Output Voltage Accuracy | ±1% over temperature and line - ensures stable core logic supply for FPGAs, DSPs, and microcontrollers without post-regulation. |
| Switching Frequency Range | 140kHz to 650kHz (phase-lockable) - balances efficiency vs. size: lower frequencies improve MOSFET conduction loss; higher frequencies shrink magnetics and capacitors. |
| Current Sense Threshold | 85mV to 115mV (typ. 100mV) - sets precise overcurrent protection point using low-value, low-power sense resistors (e.g., 5mΩ yields 20A full-scale). |
| Soft-Start Charge Current | 0.75–1.35μA - enables predictable, programmable ramp time via external capacitor on TRACK/SS pins for inrush control and sequencing. |
| Power Good Threshold | ±10% of regulated VFB - provides reliable system-level power sequencing and fault indication without external comparators. |
| Shutdown Current | 4μA - meets ultra-low-power requirements during deep sleep or standby states in portable instrumentation. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (Pins 1, 9) | Differential current sense (–) input | Connects to low-side of sense resistor; enables accurate peak-current mode control with noise rejection. |
| TG1 / TG2 (Pins 26, 15) | Top N-MOSFET gate drive output | Floating driver with INTVCC-referenced swing; requires bootstrap capacitor (BOOST–SW) for high-side operation. |
| BG1 / BG2 (Pins 23, 18) | Bottom N-MOSFET gate drive output | Ground-referenced driver; directly drives synchronous rectifier MOSFETs with fast rise/fall times (40–90ns). |
| VFB1 / VFB2 (Pins 31, 11) | Feedback input for output voltage regulation | Compares divider output against internal 0.8V reference; supports remote sensing for improved load regulation. |
| TRACK/SS1 / TRACK/SS2 (Pins 29, 13) | Soft-start and voltage tracking control | Internal 1μA pull-up enables capacitor-based ramp; also accepts external voltage for supply tracking during startup. |
| PLLIN/MODE (Pin 5) | Light-load mode select & external clock sync input | Selects Burst Mode® (≤0.7V), pulse skipping (0.9V–INTVCC–1.2V), or forced continuous (tied to INTVCC); accepts external clock for synchronization. |
| PGOOD1 / PGOOD2 (Pins 27, 28) | Open-drain power-good status output | Asserts low when corresponding VFB deviates >±10%; requires external pull-up for system power sequencing logic. |
| RUN1 / RUN2 (Pins 7, 8) | Independent enable/disable control | Pulling below 0.7V shuts down respective channel; both low disables entire IC and reduces IQ to 4μA. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~70%, cutting required input capacitance and EMI filter size in half versus in-phase operation. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of ceramic or polymer output capacitors (10μF–1000μF) and ESR (0.5mΩ–50mΩ) without redesign. |
| Three selectable light-load modes | Burst Mode® (30μA IQ), pulse skipping (low ripple), or forced continuous (lowest noise) - selected per application trade-off without hardware change. |
| Independent TRACK/SS pins | Enables staggered start-up, voltage tracking between rails (e.g., 1.2V core following 3.3V I/O), or programmable soft-start timing per channel. |
| Integrated EXTVCC switchover LDO | Automatically selects optimal INTVCC source: internal 5.25V LDO from VIN (if EXTVCC < 4.7V) or 7.5V LDO from EXTVCC (if >4.7V), improving overall system efficiency. |
| Current foldback limiting | Reduces MOSFET power dissipation during short-circuit by lowering peak current as output voltage collapses - prevents thermal runaway. |
Applications
| Automotive Infotainment Power Supply | Portable Medical Instrumentation |
|---|---|
Use Scenario: Dual-rail power for SoC (1.2V core, 3.3V I/O) and display interface in head-unit with cold-crank immunity. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller providing tightly regulated, sequenced outputs with 4V–36V input tolerance and robust undervoltage lockout. Use Value: Out-of-phase operation minimizes input capacitor stress during engine cranking; TRACK/SS pins ensure safe core-I/O power-up sequence. | Use Scenario: Battery-powered ultrasound probe requiring ultra-low standby current and clean 1.8V/3.3V analog/digital supplies. IC Role / Device Role / Timing Role: High-efficiency dual controller delivering low-noise, low-ripple outputs with Burst Mode® operation extending battery life. Use Value: 30μA quiescent current enables multi-week standby; OPTI-LOOP® maintains stability with small ceramic caps for compact PCB layout. |
| Industrial PLC I/O Module | Test & Measurement Equipment |
Use Scenario: Distributed 5V/12V DC-DC conversion in modular I/O rack powered from 24V bus with strict EMC limits. IC Role / Device Role / Timing Role: Dual-phase controller operating at 350kHz with synchronized CLKOUT to daisy-chain additional phases and reduce conducted emissions. Use Value: Phase synchronization eliminates beat frequencies; PLLIN/MODE enables external clock locking to system master clock for deterministic timing. | Use Scenario: Precision analog front-end requiring isolated, low-noise 5V and ±15V supplies derived from shared 24V input. IC Role / Device Role / Timing Role: Primary 5V buck controller feeding secondary isolated converters; PGOOD outputs coordinate system reset and calibration sequencing. Use Value: ±1% output accuracy ensures ADC/DAC reference stability; independent RUN pins allow dynamic rail enable/disable during test modes. |
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 reference, supports polyphase up to 6 phases via CLKOUT; lacks independent TRACK/SS pins. | Suitable for higher-phase-count systems but requires external sequencing for dual-rail startup. | Choose when scaling beyond two phases or needing lower reference voltage; not drop-in for independent dual-rail tracking. |
| MP2918GL-Z | Monolithic dual buck (integrated MOSFETs), 4.5V–18V input, 600kHz fixed frequency, no PLL sync or EXTVCC option. | Targeted at space-constrained consumer applications; limited input range and no light-load mode flexibility. | Choose for cost-sensitive, low-input-voltage designs where integration outweighs efficiency and feature flexibility. |
Compared with LTC3855IUFD#PBF and MP2918GL-Z, the LTC3826EUH#PBF uniquely combines independent dual-channel control, out-of-phase operation, programmable light-load behavior, and flexible power sourcing (VIN/EXTVCC) - making it optimal for high-reliability, multi-rail industrial and automotive systems demanding design margin and long-term supply stability.
Availability
LTC3826EUH#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical instrumentation, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3826EUH#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, serving industrial, automotive, communications, and healthcare markets.
The LTC3826EUH#PBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding multi-rail DC-DC conversion in battery-powered and wide-input industrial systems where efficiency, thermal performance, and sequencing control are critical.
FAQ
What is the maximum supported switching frequency for the LTC3826EUH#PBF?
The LTC3826EUH#PBF supports a phase-lockable switching frequency range from 140kHz to 650kHz. When using the internal oscillator with PLLLPF tied to INTVCC, the nominal frequency is 530kHz; with PLLLPF floating, it is 390kHz; and with PLLLPF grounded, it drops to 250kHz. External synchronization via PLLIN/MODE allows locking to any frequency between 140kHz and 650kHz, provided the external clock meets setup/hold timing requirements.
Does the LTC3826EUH#PBF integrate MOSFET drivers?
Yes, the LTC3826EUH#PBF integrates dual high-current N-channel MOSFET gate drivers: TG1/TG2 for top-side switches and BG1/BG2 for bottom-side synchronous rectifiers. Each driver delivers typical rise/fall times of 50–90ns into 3300pF loads, supporting efficient operation with discrete external MOSFETs. It does not integrate power MOSFETs - those must be selected externally based on voltage, current, and thermal requirements.
How does the LTC3826EUH#PBF achieve 30μA quiescent current?
The LTC3826EUH#PBF achieves 30μA quiescent current (with one channel active and no load) through a combination of circuit-level optimizations: ultra-low-bias internal references, sleep-mode gating of non-essential blocks during light loads, and adaptive biasing of error amplifiers and oscillators. When both channels enter Burst Mode® operation, total IQ rises to 50μA; full shutdown (both RUN pins low) reduces it to 4μA - all verified across –40°C to +85°C.
Can the LTC3826EUH#PBF operate with only one output enabled?
Yes, the LTC3826EUH#PBF supports independent channel control via RUN1 and RUN2 pins. Pulling RUN1 low disables Channel 1 while Channel 2 remains fully operational - maintaining its regulation, PGOOD2 status, and light-load mode behavior. This enables flexible power sequencing, dynamic rail disabling for power savings, and fault isolation without affecting the second output. Both channels can be independently configured for different voltages, currents, and soft-start profiles.
What is the purpose of the EXTVCC pin on the LTC3826EUH#PBF?
The EXTVCC pin on the LTC3826EUH#PBF provides an alternative power source for the internal INTVCC regulator. When EXTVCC exceeds 4.7V, the device automatically switches from the VIN-powered 5.25V LDO to a 7.5V LDO supplied by EXTVCC - improving efficiency by avoiding linear regulation losses. This allows designers to power INTVCC from a high-efficiency auxiliary rail (e.g., one of the LTC3826EUH#PBF's own outputs), reducing overall system power dissipation and thermal load.
LTC3826EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- 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 ~ 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#PBF FAQ
1.How can I place an order for LTC3826EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3826EUH#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 LTC3826EUH#PBF reliable?
The price and inventory of LTC3826EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3826EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3826EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3826EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3826EUH#PBF?
LTC3826EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3826EUH#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 LTC3826EUH#PBF?
For technical support, including LTC3826EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3826EUH#PBF requirements.
6.How does Aetrix verify that LTC3826EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3826EUH#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 LTC3826EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3826EUH#PBF?
All LTC3826EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3826EUH#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 LTC3826EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3826EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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