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Analog Devices Inc. LTC3826IG-1#TRPBF
- Part No.:
- LTC3826IG-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3826IG-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,102
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Product details
Overview
LTC3826IG-1#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 0.8V–10V output voltage with ±1% accuracy, operates from 4V–36V input, and achieves 30μA quiescent current per active channel-enabling long battery life in automotive and portable digital systems.
For engineers reviewing the LTC3826IG-1#TRPBF datasheet, LTC3826IG-1#TRPBF pinout, LTC3826IG-1#TRPBF application, or LTC3826IG-1#TRPBF equivalent, key selection criteria include out-of-phase dual-channel operation for reduced input ripple, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, selectable light-load modes (Burst Mode®, pulse skipping, continuous), and integrated power-good monitoring with overvoltage protection.
Technical Context
The LTC3826IG-1#TRPBF implements a constant-frequency current-mode architecture with 180° phase separation between channels, minimizing input capacitance requirements and supply-induced noise. Its dual error amplifiers drive ITH pins to control peak inductor current via differential sense inputs (SENSE1±/SENSE2±), while independent TRACK/SS pins enable soft-start ramping or voltage tracking.
Phase-lockable operation (140–650 kHz) is managed through PLLIN/MODE and PLLLPF pins, supporting external clock synchronization or fixed-frequency selection via pin strapping. Internal LDOs power gate drivers from VIN or EXTVCC, with automatic switchover at 4.7V and regulated INTVCC outputs of 5.25V (VIN-powered) or 7.5V (EXTVCC-powered).
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 regulators. |
| Output Voltage Range | 0.8V to 10V - programmable via external resistor divider; precise 0.8V reference enables low-voltage core supplies. |
| Quiescent Current | 30μA (one channel active), 4μA (shutdown) - extends runtime in always-on battery-powered systems. |
| Switching Frequency | 140kHz to 650kHz (phase-lockable) - balances efficiency vs. component size; 180° interleaving cuts input ripple by ~70% vs. single-phase. |
| Feedback Accuracy | ±1% over temperature - ensures stable regulation for sensitive analog/digital loads like FPGAs and ADCs. |
| Current Sense Threshold | 85mV to 115mV - sets accurate overcurrent foldback limit; compatible with low-value, high-power sense resistors. |
| Duty Cycle Max | 99.4% - supports ultra-low dropout operation (e.g., 5V→4.95V), critical for post-regulation in distributed power systems. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G package), –40°C to +85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 (1,13) | Error amplifier output / current limit control | Directly sets peak inductor current threshold; used for loop compensation and current foldback programming. |
| VFB1, VFB2 (2,12) | Feedback input | Compares output voltage (via resistor divider) to internal 0.8V reference; determines regulation setpoint. |
| SENSE1+, SENSE2+ (3,11) SENSE1–, SENSE2– (4,10) | Differential current sense inputs | Measure voltage across external sense resistor; enable accurate cycle-by-cycle current limiting and foldback. |
| PLLIN/MODE (6) | Mode selection / external sync input | Selects Burst Mode®, pulse skipping, or forced continuous operation; accepts external clock for phase synchronization. |
| RUN1, RUN2 (8,9) | Channel enable/disable control | Logic-level shutdown inputs; pulling either below 0.7V disables its channel; both low = full shutdown (4μA IQ). |
| TRACK/SS1, TRACK/SS2 (14,28) | Soft-start and tracking input | Internal 1μA pull-up charges external capacitor for controlled voltage ramp; also accepts external voltage for supply tracking. |
| PGOOD1 (27) | Power-good status indicator | Open-drain output asserted when VFB1 is within ±10% of target; used for system sequencing and fault reporting. |
| TG1, TG2 (15,26) BG1, BG2 (18,23) | Top/bottom gate drivers | Drive N-MOSFET gates with fast rise/fall times (≤90ns); TG outputs are floating, referenced to SW nodes. |
| VIN (22), PGND (21), SGND (7) | Main input, power ground, signal ground | Separate PGND/SGND routing required to prevent noise coupling into sensitive analog control loops. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by up to 70%, allowing smaller input capacitors and lower EMI in compact layouts. |
| OPTI-LOOP® compensation | Enables stable loop response across wide ranges of output capacitance (10μF–1000μF) and ESR (1mΩ–100mΩ), simplifying design validation. |
| Selectably optimized light-load efficiency | Three modes: Burst Mode® (30μA IQ), pulse skipping (low ripple), or forced continuous (lowest noise)-user-selectable per application need. |
| Integrated overvoltage protection | Monitors VFB1 for >12% overvoltage and shuts down top MOSFETs within microseconds-protects downstream loads without external circuitry. |
| Independent soft-start/tracking | Each channel has dedicated TRACK/SS pin with internal 1μA current source-supports staggered startup, rail sequencing, or voltage alignment with other supplies. |
Applications
| Automotive Infotainment Systems | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Powering DSPs, display controllers, and audio codecs in vehicle head units with 12V battery input and strict EMC limits. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller delivering 1.2V/3A and 3.3V/2.5A with phase interleaving to suppress conducted emissions. Use Value: 180° phase shift reduces input capacitor RMS current by ~70%, enabling smaller 1210-case ceramic input caps instead of larger tantalum alternatives. | Use Scenario: Portable oscilloscopes and logic analyzers requiring ultra-low standby power and clean analog supply rails. IC Role / Device Role / Timing Role: Primary DC-DC controller managing main 3.3V and auxiliary 5V rails, with Burst Mode® operation extending battery life during idle periods. Use Value: 30μA quiescent current per active channel allows >100-hour standby on a 3000mAh Li-ion pack-critical for field-deployable instruments. |
| Distributed Telecom Power Systems | Industrial PLC I/O Modules |
Use Scenario: Intermediate bus conversion in modular telecom shelves where 48V backplane feeds multiple point-of-load regulators. IC Role / Device Role / Timing Role: Dual-output controller generating 5V/10A and 12V/5A from 48V input using high-side N-MOSFETs and OPTI-LOOP® stability. Use Value: Wide 4V–36V input range accommodates brownout conditions; 99.4% max duty cycle maintains regulation even as input drops to 5.1V. | Use Scenario: DIN-rail mounted programmable logic controllers needing robust 24V-to-5V/3.3V conversion with immunity to industrial transients. IC Role / Device Role / Timing Role: Synchronous buck controller powering FPGA, microcontroller, and isolated communication interfaces with PGOOD sequencing. Use Value: ±1% output accuracy and overvoltage lockout ensure reliable operation under load step and line transient events per IEC 61000-4-4/5. |
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 EXTVCC option; fixed 500kHz frequency; no PLL sync capability. | Suitable for cost-sensitive, space-constrained designs where external sync and wide frequency tuning are unnecessary. | Choose MP2918GL-Z when board area and BOM count are prioritized over flexibility in frequency selection and power-source optimization. |
| LTC3855IUH#PBF | Single-phase controller with similar IQ (35μA), but lacks dual-channel integration, phase interleaving, and independent TRACK/SS pins. | Requires two ICs to match LTC3826IG-1#TRPBF's dual-output capability-increasing layout complexity and component count. | Choose LTC3855IUH#PBF only for single-rail applications or when existing designs already use this part family and require minimal requalification. |
Compared with MP2918GL-Z and LTC3855IUH#PBF, the LTC3826IG-1#TRPBF uniquely combines dual-phase interleaving, EXTVCC power-path flexibility, and full PLL synchronization-making it optimal for high-reliability, multi-rail systems demanding low EMI, long battery life, and precise supply sequencing.
Availability
LTC3826IG-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, battery-powered test equipment, and distributed telecom power systems requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC3826IG-1#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-grade qualification and long-term product longevity commitments.
The LTC3826IG-1#TRPBF belongs to Linear's high-efficiency synchronous controller family, designed specifically for dual-output, phase-interleaved DC-DC conversion in noise-sensitive, battery-critical, and wide-input industrial applications.
FAQ
What is the guaranteed operating temperature range for the LTC3826IG-1#TRPBF?
The LTC3826IG-1#TRPBF is fully specified and guaranteed over –40°C to +85°C ambient temperature. This industrial-grade rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section, where all parameters marked with "l" apply across this full range. The "I" grade designation explicitly denotes this extended temperature qualification, distinguishing it from the commercial-grade "E" variant.
How does the LTC3826IG-1#TRPBF achieve 30μA quiescent current?
The LTC3826IG-1#TRPBF achieves 30μA quiescent current by disabling non-essential circuitry-including one channel's oscillator, gate drivers, and error amplifier-while maintaining regulation on the active channel. This "sleep mode" is triggered when the ITH pin voltage drops below 0.4V during light-load conditions. The datasheet confirms this value under IQ specifications: "Sleep Mode (Channel 1 On)" = 30μA, measured with RUN1 = 5V, RUN2 = 0V, and no load.
Can the LTC3826IG-1#TRPBF synchronize both channels to an external clock?
Yes-the LTC3826IG-1#TRPBF synchronizes only Channel 1's rising edge to the external clock applied at PLLIN/MODE; Channel 2 automatically operates 180° out of phase. This is inherent to its dual-phase architecture and confirmed in the Functional Diagram and "Frequency Selection and Phase-Locked Loop" section: "the turn-on of controller 2's external top MOSFET is 180 degrees out of phase to the rising edge of the external clock source." No additional configuration is needed.
What protection features does the LTC3826IG-1#TRPBF include?
The LTC3826IG-1#TRPBF integrates output overvoltage protection (OVP), current foldback limiting, undervoltage lockout (UVLO), and thermal shutdown. OVP triggers if VFB1 deviates >12% from regulation, forcing immediate top-FET shutdown. Foldback limiting reduces MOSFET stress during short circuits, while UVLO holds operation below 3.7V (typical) to prevent erratic behavior. All are documented in Absolute Maximum Ratings and Electrical Characteristics tables.
Is the LTC3826IG-1#TRPBF pin-compatible with the LTC3826-1 series in other packages?
No-the LTC3826IG-1#TRPBF uses a 28-lead SSOP package, while the QFN variant (e.g., LTC3826EUH#PBF) has 36 leads and different pin assignments. Pin compatibility is not claimed in the datasheet; the "For a leadless package version… see the LTC3826 data sheet" note explicitly distinguishes the SSOP (LTC3826-1) from the QFN (LTC3826) families. Layout migration requires full redesign.
LTC3826IG-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- 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:
- 28-SSOP
LTC3826IG-1#TRPBF FAQ
1.How can I place an order for LTC3826IG-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3826IG-1#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 LTC3826IG-1#TRPBF reliable?
The price and inventory of LTC3826IG-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3826IG-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3826IG-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3826IG-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3826IG-1#TRPBF?
LTC3826IG-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3826IG-1#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 LTC3826IG-1#TRPBF?
For technical support, including LTC3826IG-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3826IG-1#TRPBF requirements.
6.How does Aetrix verify that LTC3826IG-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3826IG-1#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 LTC3826IG-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3826IG-1#TRPBF?
All LTC3826IG-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3826IG-1#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 LTC3826IG-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3826IG-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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