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Analog Devices Inc. LTC3827IG-1#TRPBF
- Part No.:
- LTC3827IG-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3827IG-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,741
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Product details
Overview
LTC3827IG-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual, 2-phase synchronous step-down controller driving all-N-channel MOSFET stages. It delivers precise 0.8V reference accuracy (±1%), operates from 4V to 36V input, supports 140kHz–650kHz phase-lockable switching, and achieves 80μA no-load quiescent current per active channel - enabling high-efficiency power conversion in battery-powered digital systems.
For engineers reviewing the LTC3827IG-1#TRPBF datasheet, LTC3827IG-1#TRPBF pinout, LTC3827IG-1#TRPBF application, or LTC3827IG-1#TRPBF equivalent, key selection criteria include out-of-phase dual-channel operation for reduced input capacitance, OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, selectable light-load modes (Burst Mode®, pulse-skipping, continuous), and independent TRACK/SS pins for soft-start or voltage tracking.
Technical Context
The LTC3827IG-1#TRPBF implements a constant-frequency current-mode architecture with two controllers operating 180° out of phase to minimize input ripple and EMI. Each channel features independent error amplifiers, current-sense comparators, and gate drivers with programmable ITH-based peak-current control and reverse-current limiting.
Its PLLIN/MODE pin serves dual functions: selecting light-load operation mode (Burst Mode® below 0.7V, pulse-skipping at 0.9V–INTVCC−1.2V, forced continuous at INTVCC) and accepting external clock synchronization (140–650kHz guaranteed lock range) via phase detector and PLLLPF-filtered loop control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V industrial rails and full Li-ion, LiFePO₄, and lead-acid battery chemistries. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable regulation for sensitive digital loads like FPGAs and processors. |
| No-Load Quiescent Current | 80μA (one channel active) - extends runtime in always-on battery systems without compromising startup responsiveness. |
| Switching Frequency Range | 140kHz to 650kHz (phase-lockable) - balances efficiency (lower f) vs. size (higher f) while enabling noise-sensitive system synchronization. |
| Reference Voltage | 0.800V ±0.8% - enables precise low-VOUT regulation down to 0.8V with standard resistor dividers. |
| Power Good Output | Open-drain PGOOD1 with ±10% trip threshold - provides reliable system-level power sequencing and fault indication. |
| Shutdown Current | 8μA - allows deep sleep during system standby with minimal battery drain. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G package), –40°C to +85°C operating temperature range. Pin count and layout match LTC3827IG-1#PBF and LTC3827EG-1 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 (1, 13) | Error amplifier outputs | Set peak inductor current per channel; voltage directly controls current limit threshold. |
| VFB1, VFB2 (2, 12) | Feedback inputs | Compare output voltage (via external divider) to 0.8V reference; enable precision regulation. |
| SENSE1+, SENSE2+ / SENSE1–, SENSE2– (3,11 / 4,10) | Differential current sense inputs | Measure MOSFET RDS(on) or sense resistor voltage to regulate peak current and enable foldback protection. |
| PLLIN/MODE (6) | Mode select & sync input | Selects Burst Mode®/pulse-skip/continuous operation or accepts external clock for phase alignment. |
| RUN1, RUN2 (8, 9) | Independent enable inputs | Logic-level shutdown per channel; both low disables entire IC and reduces IQ to 8μA. |
| TRACK/SS1, TRACK/SS2 (28, 14) | Soft-start & tracking inputs | Internal 1μA pull-up enables linear ramp-up; external resistor divider enables output voltage tracking. |
| TG1, TG2 / BG1, BG2 (26,15 / 23,18) | Top/bottom gate drivers | Drive N-MOSFET gates with fast rise/fall times (50/40ns typical); support bootstrap and direct-drive configurations. |
| PGOOD1 (27) | Power good indicator | Asserts low when VFB1 deviates >±10% from setpoint - used for system power sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input capacitor current by up to 70%, cutting required CIN volume and lowering supply-induced noise. |
| OPTI-LOOP® compensation | Enables stable loop response across 10× variation in output capacitance and ESR - eliminates re-tuning for different ceramic/polymer cap selections. |
| Independent TRACK/SS pins | Supports per-channel soft-start timing or precise voltage tracking (e.g., core vs. I/O rail sequencing) without external circuitry. |
| Current foldback limiting | Reduces MOSFET thermal stress during short-circuit events by lowering peak current as VOUT collapses - improves reliability under fault conditions. |
| Internal LDO with EXTVCC switchover | Automatically selects optimal INTVCC source (VIN or external rail ≥4.7V) - improves efficiency and enables self-biasing from regulated outputs. |
Applications
| Automotive Infotainment Power | Portable Medical Instrumentation |
|---|---|
Use Scenario: Dual-rail power for SoC (1.2V core) and display interface (3.3V I/O) in head-unit designs with strict EMI limits and cold-crank survival. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller providing tightly regulated, low-noise, out-of-phase outputs synchronized to system clock. Use Value: 180° phase shift cuts input ripple amplitude by >90%, reducing bulk capacitor count and enabling compact layout compliant with CISPR-25 Class 5. | Use Scenario: Battery-powered ultrasound handheld with FPGA, ADC, and analog front-end requiring clean, sequenced 1.8V, 3.3V, and 5V rails. IC Role / Device Role / Timing Role: Dual-output step-down controller delivering high-efficiency conversion with independent soft-start and ultra-low IQ during standby. Use Value: 80μA per-channel no-load IQ extends single-charge battery life beyond 72 hours in monitoring mode without sacrificing fast wake-up response. |
| Industrial PLC I/O Module | Telecom Remote Radio Unit (RRU) |
Use Scenario: Distributed 5V and 12V supplies for isolated digital I/O and analog sensor conditioning in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-input-voltage dual controller supporting 24V nominal bus with wide VIN range and robust overvoltage/undervoltage protection. Use Value: 4V–36V operation covers brownout and surge conditions; ±1% VREF and PGOOD1 ensure deterministic fault detection in safety-critical logic. | Use Scenario: Compact DC-DC stage converting 48V backplane to 3.3V/5V for FPGA and transceiver ASICs in outdoor small-cell base stations. IC Role / Device Role / Timing Role: Phase-locked dual controller synchronized to system timing reference to suppress switching noise in RF receive bands. Use Value: Guaranteed 140–650kHz PLL lock range enables deterministic noise placement outside LTE/5G receive windows - simplifying EMI filter design. |
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 |
|---|---|---|---|
| MP2918GL-Z | Single-chip dual controller with integrated MOSFET drivers only; lacks PLL synchronization, EXTVCC switchover, and independent TRACK/SS pins. | Suitable for cost-sensitive, space-constrained designs where external MOSFETs are not required and phase-locking is unnecessary. | Select MP2918GL-Z when board area and BOM count are prioritized over advanced sequencing, noise control, and wide-input flexibility. |
| LTC3855IUFD-1#PBF | Single-phase controller with identical 0.8V reference, OPTI-LOOP®, and Burst Mode® but no second channel or out-of-phase capability. | Used where dual-rail generation is handled by separate controllers or where interleaving is not needed for input ripple reduction. | Select LTC3855IUFD-1#PBF for simpler, lower-pin-count designs requiring same light-load efficiency and compensation flexibility without dual-phase complexity. |
Compared with MP2918GL-Z and LTC3855IUFD-1#PBF, the LTC3827IG-1#TRPBF uniquely delivers true dual-channel interleaving with independent control, PLL synchronization, and EXTVCC biasing - making it optimal for high-reliability, noise-sensitive, multi-rail systems demanding input ripple suppression and precise power sequencing.
Availability
LTC3827IG-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, portable medical instrumentation, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply and long-term production continuity.
Supply support for LTC3827IG-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, 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 LTC3827-1 product line delivers high-efficiency, low-quiescent-current dual-phase synchronous buck controllers optimized for battery-powered and noise-sensitive applications requiring precise voltage regulation, flexible sequencing, and robust fault protection.
FAQ
What is the guaranteed phase-lockable frequency range for the LTC3827IG-1#TRPBF?
The LTC3827IG-1#TRPBF guarantees PLL lock to external clocks between 140kHz and 650kHz across all manufacturing lots and temperature ranges. This range ensures reliable synchronization in noise-critical applications such as telecom RRUs and automotive ADAS systems where deterministic switching noise placement is essential. The typical capture range extends to 115kHz–800kHz, but design must rely on the guaranteed 140–650kHz window.
How does the LTC3827IG-1#TRPBF achieve 80μA quiescent current with one channel active?
The LTC3827IG-1#TRPBF achieves 80μA no-load IQ by disabling unused internal circuits per channel, including oscillator sections, gate drivers, and current-sense amplifiers for the inactive channel, while maintaining full functionality on the enabled channel. This is confirmed in the Electrical Characteristics table under "IQ Sleep Mode (Channel 1 On)" and applies specifically to the LTC3827IG-1#TRPBF's –40°C to +85°C grade.
Can the LTC3827IG-1#TRPBF drive external MOSFETs without bootstrap capacitors?
No - the LTC3827IG-1#TRPBF requires external bootstrap capacitors on BOOST1/BOOST2 pins to drive high-side N-channel MOSFETs. Its top-gate drivers (TG1/TG2) are floating and rely on bootstrap charging during the low-side conduction period. For non-boosted operation, an external high-side driver IC or P-channel MOSFET solution would be required, which is incompatible with the LTC3827IG-1#TRPBF's native gate drive architecture.
What is the function of the EXTVCC pin on the LTC3827IG-1#TRPBF?
The EXTVCC pin on the LTC3827IG-1#TRPBF enables automatic switchover between two internal LDOs: when EXTVCC < 4.7V, the 5.25V LDO powers INTVCC from VIN; when EXTVCC ≥ 4.7V, the 7.5V LDO activates and powers INTVCC from EXTVCC. This allows efficient self-biasing from a downstream converter output, reducing overall system power loss and heat generation in multi-stage power architectures.
Does the LTC3827IG-1#TRPBF support independent voltage tracking for each output?
Yes - the LTC3827IG-1#TRPBF provides independent TRACK/SS1 and TRACK/SS2 pins, each with its own internal 1μA pull-up current source. Connecting separate resistor dividers from external reference voltages to these pins enables true independent output voltage tracking during startup, allowing precise sequencing of asymmetric rails (e.g., 1.2V core before 3.3V I/O) without additional supervisory ICs.
LTC3827IG-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
LTC3827IG-1#TRPBF FAQ
1.How can I place an order for LTC3827IG-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3827IG-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 LTC3827IG-1#TRPBF reliable?
The price and inventory of LTC3827IG-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 LTC3827IG-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3827IG-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3827IG-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3827IG-1#TRPBF?
LTC3827IG-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3827IG-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 LTC3827IG-1#TRPBF?
For technical support, including LTC3827IG-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3827IG-1#TRPBF requirements.
6.How does Aetrix verify that LTC3827IG-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3827IG-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 LTC3827IG-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3827IG-1#TRPBF?
All LTC3827IG-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3827IG-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 LTC3827IG-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3827IG-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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