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Analog Devices Inc. LTC3827IUH#TRPBF
- Part No.:
- LTC3827IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3827IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,892
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Product details
Overview
LTC3827IUH#TRPBF from Analog Devices (formerly Linear Technology) is a dual, 2-phase synchronous step-down DC/DC controller IC driving all-N-channel MOSFET stages. It delivers precise 0.8V reference accuracy (±1%), supports 4V–36V input, regulates two independent outputs (0.8V–10V), and operates at phase-lockable frequencies up to 650kHz - enabling high-efficiency power conversion in battery-powered digital systems and distributed DC architectures.
For engineers reviewing the LTC3827IUH#TRPBF datasheet, LTC3827IUH#TRPBF pinout, LTC3827IUH#TRPBF application, or LTC3827IUH#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Burst Mode®, pulse skipping, continuous conduction), real-world soft-start/tracking behavior, and cross-referenced alternatives for dual-output industrial and automotive power designs.
Technical Context
The LTC3827IUH#TRPBF implements a constant-frequency current-mode control architecture with two independent controllers operating 180° out of phase to reduce input ripple and EMI. Each channel features OPTI-LOOP® compensation, adjustable current foldback limiting, and precision 0.8V feedback reference with ±1% tolerance over temperature.
It supports three light-load operating modes via the PLLIN/MODE pin: Burst Mode® (80μA no-load IQ), pulse-skipping, or forced continuous conduction. Internal LDOs power gate drivers from VIN or EXTVCC (4.5V–10V), and dropout operation extends duty cycle to 99% with internal CB recharge management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - covers 3S–10S Li-ion, 12V/24V automotive, and industrial DC rails without external pre-regulation. |
| Output Voltage Range | 0.8V to 10V per channel - supports core logic (0.8V–1.2V), I/O (1.8V–3.3V), and auxiliary rails (5V–8.5V) with single-controller flexibility. |
| No-Load Quiescent Current | 80μA (one channel active) - enables multi-day runtime in always-on battery systems such as portable instrumentation or remote sensors. |
| Feedback Reference Accuracy | ±1% over –40°C to +85°C - ensures stable output regulation across automotive and industrial thermal environments without calibration. |
| Switching Frequency Range | 140kHz to 650kHz (phase-lockable) - allows optimization between inductor size (higher f) and conduction loss (lower f) in space-constrained designs. |
| Duty Cycle Capability | Up to 99% - maintains regulation under high-input/low-output conditions (e.g., 24V→3.3V), minimizing dropout risk in wide-VIN applications. |
| Current Sense Threshold | 80mV to 115mV (adjustable via ITH voltage) - sets accurate overcurrent protection while accommodating low-RDS(on) MOSFETs and sense resistors. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed SGND pad (Pin 33), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Differential current sense (–) | Connects to low-side of sense resistor; forms Kelvin pair with SENSE+ for accurate current monitoring and foldback triggering. |
| 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 for synchronization. |
| SGND (6, 33) | Small-signal ground reference | Must be routed separately from PGND; exposed pad (Pin 33) is SGND and requires PCB soldering for thermal and noise performance. |
| RUN1 / RUN2 (7, 8) | Independent channel enable | Pull below 0.7V to disable respective controller; both low → full shutdown (8μA IQ) with INTVCC regulator disabled. |
| TG1 / TG2 (15, 26) | Top N-MOSFET gate drive | Floating driver output (INTVCC–0.5V swing on SW node); drives high-side FETs in synchronous buck topology. |
| BG1 / BG2 (18, 23) | Bottom N-MOSFET gate drive | Ground-referenced driver (0V to INTVCC); controls synchronous rectification with reverse-current prevention. |
| VFB1 / VFB2 (11, 31) | Feedback input | Compares output divider voltage to 0.8V reference; enables remote sensing and tight regulation (±1%) across load/temperature. |
| TRACK/SS1 / TRACK/SS2 (13, 29) | Soft-start & tracking control | Internal 1μA pull-up charges external capacitor for linear ramp; also accepts external voltage for supply tracking during startup. |
| PGOOD1 / PGOOD2 (27, 28) | Power-good status indicator | Open-drain output pulled low if VFB deviates >±10% from setpoint - used for sequencing, fault reporting, or system enable. |
| ITH1 / ITH2 (12, 30) | Error amplifier output | Controls peak inductor current via current comparator trip point; key node for loop compensation and transient response tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input capacitor current by ~30% and lowers conducted EMI vs. in-phase operation - cuts required CIN size and cost. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitance (10μF–1000μF) and ESR (0.5mΩ–100mΩ) without redesigning compensation network. |
| Adjustable light-load mode | Three selectable modes (Burst, pulse skip, continuous) let designers trade off efficiency (Burst: 80μA IQ), ripple (continuous), and EMI (pulse skip). |
| 99% duty cycle dropout operation | Maintains regulation when VIN approaches VOUT; internal circuitry forces periodic top-FET off-time to recharge bootstrap capacitors. |
| Independent soft-start/tracking | Each channel's TRACK/SS pin supports individual ramp timing or voltage tracking - essential for FPGA/CPU core-I/O sequencing and hot-swap compliance. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual-rail power for SoC (1.0V core) and interface (3.3V I/O) in head-unit ECUs operating from 9V–16V battery with cold-crank down to 4.5V. IC Role / Device Role / Timing Role: Dual-phase synchronous controller managing independent 1.0V/3.3V outputs with out-of-phase switching to minimize input ripple and meet CISPR-25 Class 5 EMI limits. Use Value: 99% duty cycle sustains regulation during cold-crank; ±1% VREF ensures SoC stability; 80μA IQ extends backup battery life in sleep mode. |
Use Scenario: Distributed 5V and 24V-to-12V conversion in modular PLC backplane with strict thermal limits and long-term reliability requirements. IC Role / Device Role / Timing Role: Dual-channel controller delivering isolated 5V (digital logic) and 12V (analog sensor bias) from common 24V rail using separate inductors and feedback networks. Use Value: Independent RUN pins enable dynamic rail shutdown; PGOOD outputs feed watchdog logic; –40°C to +85°C rating matches industrial ambient spec. |
| Portable Medical Imaging Sensor | Telecom Remote Radio Unit (RRU) |
|
Use Scenario: Battery-powered ultrasound probe requiring ultra-low-noise 1.8V analog front-end and 3.3V digital domain, with multi-hour operation per charge. IC Role / Device Role / Timing Role: Dual controller operating in Burst Mode® to minimize standby power, with OPTI-LOOP® ensuring fast transient response to pulsed imaging loads. Use Value: 80μA no-load IQ doubles battery runtime vs. continuous mode; out-of-phase switching reduces conducted noise into sensitive ADC paths. |
Use Scenario: Outdoor 4G/5G RRU powered from 48V DC plant with need for efficient 12V (FPGA) and 5V (RFIC) rails in thermally constrained enclosure. IC Role / Device Role / Timing Role: High-efficiency dual controller using EXTVCC to derive INTVCC from its own 12V output - improving overall system efficiency by bypassing VIN LDO losses. Use Value: EXTVCC support reduces total power loss by ~150mW at full load; phase-lockable fSW enables synchronized switching with baseband clock to avoid beat frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855IUFD#TRPBF | Single-channel, 4-phase capable; higher max fSW (850kHz); no independent TRACK/SS pins; 60μA IQ (single-channel active) | Best for high-current single-rail designs needing multiphase interleaving; lacks dual independent soft-start for sequencing-critical systems. | Choose LTC3855 for >30A single-output rails where phase interleaving reduces ripple; avoid when dual independent regulation or tracking is required. |
| MP8770GL-Z | Monolithic dual buck (integrated MOSFETs); 2.5V–18V input; fixed 500kHz fSW; no PLL sync; 120μA IQ; smaller 4mm × 4mm QFN | Suitable for space-constrained, medium-power apps (<10A/channel); no EXTVCC or foldback limiting; limited VOUT adjustability (0.6V–5.5V). | Choose MP8770 for cost-sensitive, lower-power designs where integration outweighs flexibility; avoid for wide-VIN (>18V), high-accuracy, or high-reliability industrial use. |
Compared with LTC3855IUFD#TRPBF and MP8770GL-Z, the LTC3827IUH#TRPBF uniquely combines dual independent controllers, true wide-VIN (4V–36V), ±1% reference accuracy, and comprehensive light-load mode selection - making it optimal for demanding dual-rail industrial and automotive power systems requiring design longevity and thermal resilience.
Availability
LTC3827IUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and portable medical imaging sensors requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LTC3827IUH#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3827IUH#TRPBF belongs to Linear's high-performance power controller family, designed specifically for dual-output, wide-VIN, high-efficiency DC/DC conversion in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the operating temperature range for the LTC3827IUH#TRPBF?
The LTC3827IUH#TRPBF is 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 notes, with full parameter assurance across the range - unlike the E-grade variant which is only characterized from 0°C to 85°C. The device uses internal thermal derating and robust packaging to maintain stability in automotive under-hood or factory-floor environments.
Does the LTC3827IUH#TRPBF support synchronization to an external clock source?
Yes, the LTC3827IUH#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock is applied, the internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge. A series RC filter must be connected to the PLLLPF pin to set loop bandwidth. Synchronization range is 115kHz to 650kHz, enabling noise-sensitive systems (e.g., RF transceivers) to avoid beat frequencies and simplify EMI filtering.
How does the LTC3827IUH#TRPBF achieve 80μA quiescent current?
The LTC3827IUH#TRPBF achieves 80μA no-load IQ by entering Burst Mode® operation - where both channels cycle between active switching bursts and deep sleep. During sleep, internal circuitry (oscillator, error amplifiers, gate drivers) is disabled, and the ITH pins are parked at 0.425V. This ultra-low IQ is measured with one channel enabled and the other shut down (RUN2 = 0V), as specified in the Electrical Characteristics table under "IQ Sleep Mode (Channel 1 On)."
Can the LTC3827IUH#TRPBF drive high-side MOSFETs without external bootstrap components?
No - the LTC3827IUH#TRPBF requires external bootstrap components for high-side N-MOSFET drive. Each channel needs a bootstrap capacitor (CB) between BOOST and SW pins, plus a Schottky diode from INTVCC to BOOST. These components recharge the floating gate drive supply during each off-cycle. The datasheet Figure 1 shows standard implementation; omitting them prevents proper top-FET turn-on and causes immediate failure under load.
What is the purpose of the EXTVCC pin on the LTC3827IUH#TRPBF?
The EXTVCC pin on the LTC3827IUH#TRPBF allows powering the internal INTVCC LDO from an external regulated supply (4.5V–10V) instead of VIN. When EXTVCC exceeds 4.7V, the VIN-based 5.25V LDO shuts off and a 7.5V LDO activates - reducing power loss and heat generation. This is commonly used to supply INTVCC from one of the LTC3827IUH#TRPBF's own regulated outputs (e.g., 8.5V rail), improving overall system efficiency by ~2–3%.
LTC3827IUH#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, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3827IUH#TRPBF FAQ
1.How can I place an order for LTC3827IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3827IUH#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 LTC3827IUH#TRPBF reliable?
The price and inventory of LTC3827IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3827IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3827IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3827IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3827IUH#TRPBF?
LTC3827IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3827IUH#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 LTC3827IUH#TRPBF?
For technical support, including LTC3827IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3827IUH#TRPBF requirements.
6.How does Aetrix verify that LTC3827IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3827IUH#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 LTC3827IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3827IUH#TRPBF?
All LTC3827IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3827IUH#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 LTC3827IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3827IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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