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Analog Devices Inc. LTC3826IUH#PBF
- Part No.:
- LTC3826IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3826IUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,882
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Product details
Overview
LTC3826IUH#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 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 LTC3826IUH#PBF datasheet, LTC3826IUH#PBF pinout, LTC3826IUH#PBF application, or LTC3826IUH#PBF equivalent, key selection criteria include out-of-phase operation for reduced input capacitance, OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, selectable Burst Mode®/pulse-skipping/continuous conduction, and dual independent TRACK/SS pins for soft-start or voltage tracking.
Technical Context
The LTC3826IUH#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 ITH error amplifier outputs independently set peak inductor current per channel, while separate SENSE+ and SENSE− differential inputs provide precise current sensing with foldback limiting.
It integrates dual internal LDOs: one sourcing INTVCC from VIN (5.25V) or EXTVCC (7.5V), and another powering gate drivers via floating bootstrap circuits. The PLLIN/MODE pin serves dual roles-external clock synchronization input and light-load mode selector-while PHASMD configures inter-channel and CLKOUT phase relationships.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V automotive, 24V industrial, and multi-cell Li-ion battery inputs without external pre-regulation. |
| Quiescent Current | 30μA (one channel active) - extends runtime in always-on battery systems like telematics or portable instrumentation. |
| Output Accuracy | ±1% over temperature - ensures stable core logic and memory supply voltages in embedded processors. |
| Switching Frequency | 140kHz–650kHz, phase-lockable - enables EMI-controlled layout and optimal tradeoff between inductor size and conduction loss. |
| Reference Voltage | 0.800V ±0.8% - allows precise low-voltage regulation (e.g., 0.8V FPGA core) with minimal resistor divider error impact. |
| Current Sense Threshold | 85mV–115mV - sets accurate overcurrent protection with low-loss, high-value sense resistors (e.g., 5mΩ yields 17–23A trip). |
| Shutdown Current | 4μA - enables full system sleep states in IoT edge nodes where standby power budget is sub-10μA. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND), rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) | Connects to low-side of sense resistor; referenced to SENSE+ to reject common-mode noise in high-dv/dt switch node environments. |
| TG1 / TG2 (26, 15) | Top N-MOSFET gate drive | Floating driver output swinging from SW node to INTVCC–0.5V; requires external bootstrap capacitor and Schottky diode. |
| BG1 / BG2 (23, 18) | Bottom N-MOSFET gate drive | Ground-referenced driver (0V to INTVCC); directly drives synchronous rectifier with fast 40–90ns rise/fall times. |
| TRACK/SS1 / TRACK/SS2 (29, 13) | Soft-start & voltage tracking input | Internal 1μA pull-up charges external capacitor for linear VOUT ramp; also accepts external voltage divider for supply sequencing. |
| PLLIN/MODE (5) | Mode select & sync input | DC voltage selects Burst Mode (<0.7V), pulse skipping (0.9V–INTVCC–1.2V), or forced continuous (INTVCC); AC signal enables PLL synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~70%, cutting required bulk input capacitance and lowering EMI from supply noise coupling. |
| OPTI-LOOP® compensation | Allows stable loop response across 10μF–1000μF ceramic or polymer output capacitors without re-tuning compensation network. |
| Independent RUN1/RUN2 control | Enables asymmetric power sequencing-e.g., keep 3.3V rail active while disabling 8.5V display supply during low-power mode. |
| 99% duty cycle dropout operation | Maintains regulation down to VIN–VOUT < 100mV, supporting ultra-low dropout applications like 5V-to-4.9V post-regulation in USB-C PD systems. |
| Power Good outputs (PGOOD1/2) | Open-drain indicators with ±10% trip threshold provide reliable enable signals for downstream logic or fault logging without external comparators. |
Applications
| Automotive Infotainment Power | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Dual-rail power for SoC (1.1V core, 3.3V I/O) and display backlight (8.5V) in head-unit modules operating from 9V–16V vehicle battery. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent voltage rails with precise sequencing and load-step response. Use Value: 30μA IQ extends ignition-off runtime; out-of-phase operation minimizes conducted EMI into AM/FM radio band; PGOOD signals coordinate MCU wake-up and display enable. | Use Scenario: Portable oscilloscope with FPGA-based acquisition engine, ADC reference, and LCD bias supply-all powered from single 3S Li-ion pack (9V–12.6V). IC Role / Device Role / Timing Role: High-efficiency dual-output DC/DC controller delivering 1.2V FPGA core and 3.3V analog front-end with independent soft-start. Use Value: Burst Mode® maintains >85% efficiency at 100μA load, enabling 100+ hour battery life in standby; TRACK/SS pins ensure safe power-up sequence preventing latch-up. |
| Distributed Telecom DC System | Industrial PLC I/O Module |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying isolated 12V and 5V rails to multiple line cards via backplane. IC Role / Device Role / Timing Role: Dual-phase controller generating non-isolated intermediate voltages with phase synchronization to reduce input filter stress. Use Value: Phase-lockable frequency avoids beat frequencies with other converters; wide 4V–36V input accommodates brownout conditions; FOLDDIS disables foldback during controlled short-circuit testing. | Use Scenario: DIN-rail mounted PLC module requiring robust 24V input handling and dual regulated outputs (5V logic, 12V sensor excitation) in harsh factory environments. IC Role / Device Role / Timing Role: Industrial-grade dual buck controller with extended temperature range and undervoltage lockout hysteresis. Use Value: –40°C to +85°C rating ensures reliability in uncooled enclosures; ±1% VREF and current foldback protect against field wiring faults; EXTVCC option allows efficient local 5V generation from 12V 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 |
|---|---|---|---|
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only; no external gate drive flexibility; fixed 500kHz frequency. | Lacks independent TRACK/SS and PLL sync; limited to mid-power apps (<20A/channel); no EXTVCC option. | Choose MP2918GL-Z for cost-sensitive, space-constrained designs where integrated drivers suffice and frequency agility isn't required. |
| TPS546D24RQFT | High-current dual-phase controller with PMBus interface, telemetry, and digital loop compensation; 3.3V–18V input; 0.5V–3.3V output range. | Requires digital configuration; narrower input/output range; no Burst Mode®; higher IQ (120μA). | Choose TPS546D24RQFT when telemetry, remote monitoring, or adaptive loop tuning is needed in server or networking gear. |
Compared with MP2918GL-Z and TPS546D24RQFT, the LTC3826IUH#PBF offers superior light-load efficiency via selectable modes, wider input/output flexibility, and analog configurability-making it optimal for mixed-signal, battery-critical, or EMI-sensitive industrial and automotive systems where design-in simplicity and analog robustness are prioritized over digital control.
Availability
LTC3826IUH#PBF is available at Aetrix Electronics and suitable for automotive infotainment, battery-powered test equipment, and distributed telecom DC power systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3826IUH#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3826IUH#PBF belongs to Linear's precision switching controller family, designed specifically for high-efficiency, low-quiescent-current dual-output DC/DC conversion in demanding environments where thermal performance, EMI control, and supply resilience are critical.
FAQ
What is the maximum supported switching frequency for LTC3826IUH#PBF?
The LTC3826IUH#PBF supports a phase-lockable switching frequency up to 650kHz when synchronized to an external clock via the PLLIN/MODE pin. In free-running mode with PLLLPF tied to INTVCC, the nominal frequency is 530kHz. This high-frequency capability enables compact magnetics and low-output-ripple designs while maintaining high efficiency across load ranges.
How does the LTC3826IUH#PBF achieve 30μA quiescent current?
The LTC3826IUH#PBF achieves 30μA quiescent current by entering a deep-sleep state when only one channel is active and light-load conditions trigger Burst Mode® operation. In this state, internal circuitry-including oscillator, error amplifiers, and gate drivers-is selectively disabled, while the active channel maintains regulation using stored energy in the output capacitor. The 4μA shutdown current occurs only when both RUN pins are pulled low.
Can LTC3826IUH#PBF drive high-side MOSFETs with logic-level gate thresholds?
Yes, the LTC3826IUH#PBF can drive logic-level high-side N-MOSFETs via its TG1/TG2 floating gate drivers, which swing from the SW node to INTVCC–0.5V. With INTVCC regulated at 5.25V (from VIN) or 7.5V (from EXTVCC), the effective gate drive voltage exceeds 4.5V-sufficient for most 4.5V-threshold MOSFETs. Bootstrap capacitor selection must ensure adequate charge replenishment during 99% duty-cycle dropout operation.
What is the purpose of the EXTVCC pin on LTC3826IUH#PBF?
The EXTVCC pin on LTC3826IUH#PBF provides an alternative power source for the INTVCC regulator, bypassing the internal VIN-fed LDO when EXTVCC exceeds 4.7V. This allows efficient local generation of INTVCC from a secondary converter output (e.g., 5V rail), reducing power loss and thermal stress compared to deriving all gate drive power from the main 12V–36V input. It supports seamless transition between sources with built-in hysteresis.
Does LTC3826IUH#PBF support independent voltage tracking between its two outputs?
No, the LTC3826IUH#PBF does not support direct inter-output voltage tracking. Each channel has its own independent TRACK/SS1 and TRACK/SS2 pin, allowing each output to track a separate external voltage source (e.g., VOUT1 tracks a 3.3V rail while VOUT2 tracks a 5V rail), but there is no internal circuitry to force VOUT2 to follow VOUT1's ramp profile. Sequencing must be implemented externally using resistor dividers or dedicated tracking ICs.
LTC3826IUH#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)
LTC3826IUH#PBF FAQ
1.How can I place an order for LTC3826IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3826IUH#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 LTC3826IUH#PBF reliable?
The price and inventory of LTC3826IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3826IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3826IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3826IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3826IUH#PBF?
LTC3826IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3826IUH#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 LTC3826IUH#PBF?
For technical support, including LTC3826IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3826IUH#PBF requirements.
6.How does Aetrix verify that LTC3826IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3826IUH#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 LTC3826IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3826IUH#PBF?
All LTC3826IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3826IUH#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 LTC3826IUH#PBF part is unused and in its original packaging.
Return procedure for LTC3826IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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