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Analog Devices Inc. LTC3834EUFD#PBF
- Part No.:
- LTC3834EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3834EUFD#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,993
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Product details
Overview
LTC3834EUFD#PBF from Analog Devices (formerly Linear Technology) is a high-performance, constant-frequency current-mode synchronous step-down DC/DC controller driving dual N-channel MOSFETs. It delivers 0.8V–10V output voltage from 4V–36V input, achieves ±1% VOUT accuracy, operates with 30µA no-load quiescent current, and supports phase-locked synchronization up to 650kHz - enabling efficient power conversion in automotive infotainment head units requiring low standby power and tight voltage regulation.
For engineers reviewing the LTC3834EUFD#PBF datasheet, LTC3834EUFD#PBF pinout, LTC3834EUFD#PBF application, or LTC3834EUFD#PBF equivalent, key selection considerations include its OPTI-LOOP® compensation for wide COUT/ESR flexibility, 99% duty-cycle dropout capability, selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous), and PolyPhase® clock output for multi-phase scaling in telecom base station power rails.
Technical Context
The LTC3834EUFD#PBF implements a constant-frequency current-mode control architecture with an internal 0.8V precision reference and transconductance error amplifier (gm = 0.5 mmho). Its OPTI-LOOP® compensation network minimizes required output capacitance by optimizing transient response across diverse capacitor ESR values.
It integrates dual gate drivers (TG/BG) with 50ns rise/fall times, internal LDOs supporting dual-power sourcing (VIN or EXTVCC), and a phase-locked loop (PLL) with guaranteed 140kHz–650kHz lock range. The device features dedicated pins for soft-start/tracking (TRACK/SS), power-good monitoring (PGOOD), and clock distribution (CLKOUT/PHASMD) for synchronized multi-phase operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports 12V/24V automotive batteries and telecom -48V derived rails. |
| VOUT Range | 0.8V to 10V - programmable via external resistor divider; enables core logic, FPGA I/O, and analog supply generation. |
| IQ (No Load) | 30µA - extends battery runtime in portable digital devices during idle states. |
| Output Accuracy | ±1% - ensures stable microprocessor core voltage under load/temperature variation. |
| Switching Freq | 140kHz to 650kHz (phase-lockable) - balances efficiency vs. size: lower freq improves MOSFET conduction loss; higher freq reduces inductor/capacitor footprint. |
| Duty Cycle Max | 99.4% - sustains regulation during deep dropout (e.g., cold-crank 6V automotive input at 5V output). |
| Light-Load Modes | Burst Mode®, pulse-skipping, or forced continuous - selectable via PLLIN/MODE pin to optimize efficiency vs. noise/ripple trade-offs. |
Pinout & Package
Package: 20-pin (4mm × 5mm) plastic QFN (UFD), exposed thermal pad (Pin 21) soldered to SGND for enhanced thermal performance (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (19) | Open-drain clock output | Synchronizes downstream PolyPhase® controllers; enables interleaved multi-phase designs without external clock generator. |
| PLLLPF (20) | PLL loop filter node | Accepts RC network to set PLL bandwidth when synchronizing to external clock on PLLIN/MODE. |
| ITH (1) | Error amplifier output / compensation node | Controls peak inductor current; connects to OPTI-LOOP® network for dynamic loop optimization. |
| TRACK/SS (2) | Soft-start & tracking input | Internal 1µA pull-up charges external capacitor for controlled VOUT ramp; accepts resistor divider for supply tracking. |
| VFB (3) | Feedback voltage input | Compares remote-sensed output voltage against 0.8V reference; enables precision regulation with Kelvin sensing. |
| SGND (4) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback path and error amplifier. |
| PGND (5) | Power ground | Return path for bottom MOSFET source, Schottky cathode, and input capacitor - routed separately from SGND. |
| BG (6) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing = 0V to INTVCC (5.25V or 7.5V). |
| INTVCC (7) | Internal LDO output | Powers control circuitry and gate drivers; sourced from VIN (5.25V LDO) or EXTVCC (7.5V LDO) depending on voltage level. |
| EXTVCC (8) | External bias input | Enables higher-efficiency biasing from regulated auxiliary rail (e.g., buck output); switchover at 4.7V with 0.2V hysteresis. |
| VIN (9) | Main input supply | Primary power source; requires local ceramic bypass to SGND to suppress high di/dt switching noise. |
| SW (10) | Switch node | Connects to inductor; voltage swings from ~–0.3V (Schottky drop) to VIN - critical for layout to minimize EMI. |
| TG (11) | Top gate driver output | Floating driver output referenced to SW; swing = SW to (SW + INTVCC – 0.5V) - drives high-side N-MOSFET. |
| BOOST (12) | Bootstrap supply | Charged via external diode/capacitor from INTVCC; supplies floating bias for TG driver during high-side conduction. |
| RUN (13) | Enable/shutdown control | Logic-level input; <0.7V disables controller, reducing IQ to 4µA - used for system-level power sequencing. |
| SENSE– (14) | Current sense negative input | Low-side current sense node; differential pair with SENSE+ measures RSENSE voltage drop for cycle-by-cycle current limiting. |
| SENSE+ (15) | Current sense positive input | High-side current sense node; combined with SENSE–, sets current trip threshold based on ITH voltage and RSENSE value. |
| PGOOD (16) | Power-good open-drain output | Asserts low when VFB deviates >±10% from 0.8V - signals downstream logic that output is within regulation. |
| PLLIN/MODE (17) | PLL sync input / light-load mode select | Accepts external clock for synchronization; also selects Burst Mode® (<0.8V), pulse-skipping (0.8V–INTVCC–0.5V), or forced continuous (tied to INTVCC). |
| PHASMD (18) | Phase modulation control | Adjusts CLKOUT phase relative to TG edge (0°, 90°, 180°, 270°) for optimal current sharing in PolyPhase® configurations. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide range of output capacitor types (ceramic, polymer, electrolytic) and ESR values without redesigning compensation network. |
| Dual N-Channel MOSFET Drive | Integrated high-current TG/BG drivers eliminate need for external driver ICs, reducing BOM count and PCB area in high-efficiency synchronous buck designs. |
| 99.4% Maximum Duty Cycle | Supports ultra-low dropout operation - maintains regulation even when VIN drops to within ~100mV of VOUT, critical for automotive cold-crank scenarios. |
| 30µA Quiescent Current | Extends battery life in always-on systems (e.g., telematics, GPS trackers) by minimizing standby power loss without sacrificing start-up speed. |
| Programmable Light-Load Operation | Three distinct modes (Burst Mode®, pulse-skipping, forced continuous) allow designers to prioritize efficiency, ripple, or EMI performance based on end-application requirements. |
| CLKOUT & PHASMD for PolyPhase® | Enables seamless daisy-chaining of multiple LTC3834 controllers with adjustable phase offsets - simplifies design of high-current, low-ripple multiphase supplies for servers and FPGAs. |
Applications
| Automotive Infotainment | Telecom Base Station |
|---|---|
Use Scenario: Powering DSP, SoC, and display interface in vehicle head units with 12V battery input subject to cold-crank dips. IC Role / Device Role / Timing Role: Primary synchronous step-down controller regulating 1.2V core and 3.3V I/O rails from unregulated 4V–18V input. Use Value: 99.4% duty cycle maintains regulation during 6V cold-crank events; 30µA IQ extends backup battery life during ignition-off monitoring. | Use Scenario: Generating intermediate 5V/3.3V rails from -48V telecom rectified supply in distributed power architecture. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter operating at 360kHz with phase-lock to system master clock. Use Value: Phase-locked operation eliminates beat frequencies between power stages; ±1% VOUT accuracy ensures reliable SERDES and PHY operation. |
| Industrial IoT Gateway | Portable Medical Monitor |
Use Scenario: Battery-powered edge gateway requiring long field deployment with cellular, Wi-Fi, and sensor interfaces active intermittently. IC Role / Device Role / Timing Role: Main system power controller managing 3.3V logic and 5V USB peripheral rails using Burst Mode® for sub-mA standby. Use Value: 30µA IQ enables >1-year battery life on 2000mAh Li-ion; TRACK/SS pin enables coordinated soft-start with MCU reset timing. | Use Scenario: Portable ECG monitor powered by single-cell Li-ion (3.0V–4.2V) requiring ultra-low-noise 1.8V analog supply. IC Role / Device Role / Timing Role: Low-ripple synchronous buck controller operating in forced continuous mode to avoid audible noise in sensitive analog front-end. Use Value: Forced continuous mode eliminates low-frequency switching artifacts; PGOOD output sequences ADC power-up after stable VOUT is achieved. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3834-1EUFD#PBF | Omits CLKOUT, EXTVCC, and PGOOD pins; 16-pin DFN package; no PolyPhase® support. | Suitable only for single-phase, non-synchronized, cost-sensitive designs where clock output and auxiliary monitoring are unnecessary. | Select LTC3834-1EUFD#PBF only when full feature set is not required and board space is constrained - not a drop-in replacement. |
| MP2918GL-Z | Monolithic synchronous buck (integrated MOSFETs); 4.5V–18V VIN; fixed 500kHz fSW; no PLL or PolyPhase® capability. | Targeted at compact, medium-current (≤15A) applications where integration outweighs flexibility; lacks external MOSFET drive and frequency synchronization. | Choose MP2918GL-Z for simplified layout and lower component count in ≤15A applications; LTC3834EUFD#PBF remains preferred for >20A, multi-phase, or wide-input designs. |
Compared with LTC3834-1EUFD#PBF and MP2918GL-Z, the LTC3834EUFD#PBF uniquely combines wide 4V–36V input range, phase-locked synchronization, PolyPhase® clock distribution, and 30µA quiescent current - making it the only option among the three capable of scalable, high-reliability, multi-rail automotive and telecom power systems.
Availability
LTC3834EUFD#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, telecom base station power modules, and industrial IoT gateways requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability validation.
Supply support for LTC3834EUFD#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3834EUFD#PBF belongs to Linear's high-performance power controller family designed for demanding DC/DC conversion in automotive, industrial, and communications infrastructure where efficiency, precision, and robustness are critical.
FAQ
What is the minimum input voltage required for the LTC3834EUFD#PBF to operate?
The LTC3834EUFD#PBF has an undervoltage lockout (UVLO) threshold of 3.7V (typical) with hysteresis. It begins switching when VIN rises above ~4.0V and shuts down cleanly below 3.7V. This allows reliable operation across automotive battery ranges including cranking transients down to 6V while preventing erratic behavior near startup thresholds. The LTC3834EUFD#PBF is specified for continuous operation from 4V to 36V.
How does the EXTVCC pin improve efficiency in the LTC3834EUFD#PBF?
The EXTVCC pin allows the LTC3834EUFD#PBF to source its internal INTVCC regulator from an external, higher-efficiency supply (e.g., a secondary buck output) instead of VIN. When EXTVCC exceeds 4.7V, the device switches from the 5.25V VIN-based LDO to a 7.5V EXTVCC-based LDO, reducing power dissipation in the controller's bias circuitry. This directly lowers total system losses - especially beneficial in multi-rail architectures where one rail powers another. The LTC3834EUFD#PBF uses this feature to achieve 30µA IQ without compromising gate drive strength.
Can the LTC3834EUFD#PBF be used without an external current sense resistor (RSENSE)?
No - the LTC3834EUFD#PBF requires an external RSENSE between the power ground and the source of the bottom MOSFET to provide accurate cycle-by-cycle current limiting and regulation. Unlike No-RSENSE™ controllers (e.g., LTC3866), the LTC3834EUFD#PBF relies on differential sensing across RSENSE for both current-mode control and foldback protection. Omitting RSENSE will prevent proper operation and may damage external MOSFETs due to uncontrolled peak current. The LTC3834EUFD#PBF datasheet specifies maximum sense voltage of 115mV at full scale.
What is the purpose of the PHASMD pin on the LTC3834EUFD#PBF?
The PHASMD pin on the LTC3834EUFD#PBF controls the phase relationship between the internal top-gate driver (TG) signal and the clock output (CLKOUT), enabling precise interleaving in PolyPhase® multi-controller configurations. By applying logic levels (GND, INTVCC, or floating), it selects 0°, 90°, 180°, or 270° phase offset - allowing up to four LTC3834EUFD#PBF controllers to share load current evenly while reducing input/output ripple. This eliminates need for external phase-shift circuitry and simplifies high-current power supply design. The LTC3834EUFD#PBF leverages PHASMD to achieve optimal thermal and EMI performance in parallel deployments.
Does the LTC3834EUFD#PBF support output voltages below 0.8V?
No - the LTC3834EUFD#PBF has a fixed 0.8V internal reference and regulates VOUT to maintain VFB = 0.8V. Its minimum programmable output is therefore 0.8V (set by VFB divider ratio). While TRACK/SS can be used to ramp VOUT from 0V to final value, the final regulated point cannot fall below 0.8V. For sub-0.8V outputs (e.g., 0.6V CPU cores), designers must use a different controller such as the LTC3880 or LTC3883, which support external reference or programmable references. The LTC3834EUFD#PBF is optimized for 0.8V–10V range applications like FPGA I/O, memory, and analog supplies.
LTC3834EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- 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:
- 20-QFN (4x5)
LTC3834EUFD#PBF FAQ
1.How can I place an order for LTC3834EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834EUFD#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 LTC3834EUFD#PBF reliable?
The price and inventory of LTC3834EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3834EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834EUFD#PBF?
LTC3834EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834EUFD#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 LTC3834EUFD#PBF?
For technical support, including LTC3834EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834EUFD#PBF requirements.
6.How does Aetrix verify that LTC3834EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3834EUFD#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 LTC3834EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3834EUFD#PBF?
All LTC3834EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834EUFD#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 LTC3834EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3834EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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