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Analog Devices Inc. LTC3834EUFD#TRPBF
- Part No.:
- LTC3834EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3834EUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,429
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Product details
Overview
LTC3834EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, constant-frequency current-mode synchronous step-down DC/DC controller driving dual N-channel MOSFETs. It delivers 0.8V–10V output voltage from a 4V–36V input, achieves ±1% VOUT accuracy, operates with 30µA no-load quiescent current, and supports phase-locked synchronization up to 650kHz - enabling compact, low-power battery-operated digital systems.
For engineers reviewing the LTC3834EUFD#TRPBF datasheet, LTC3834EUFD#TRPBF pinout, LTC3834EUFD#TRPBF application, or LTC3834EUFD#TRPBF equivalent, this page provides verified technical context, validated package mapping, confirmed pin functions, real-world application constraints, and two rigorously cross-checked alternative parts for automotive, telecom, and distributed power designs.
Technical Context
The LTC3834EUFD#TRPBF implements a constant-frequency current-mode control architecture with OPTI-LOOP® compensation, enabling stable transient response across wide output capacitance and ESR ranges. Its error amplifier drives the ITH pin to modulate peak inductor current, while the 0.8V precision reference and ±1% output accuracy ensure tight regulation under load and line variations.
It integrates dual N-channel gate drivers (TG/BG), internal LDOs for INTVCC (5.25V/7.5V selectable via EXTVCC), and a phase-locked loop supporting external clock synchronization from 140kHz to 650kHz. The device supports three light-load modes - Burst Mode® (30µA IQ), pulse-skipping, or forced continuous - with programmable soft-start/tracking via the TRACK/SS pin and output overvoltage protection via PGOOD monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - accommodates 12V/24V automotive batteries and wide-input telecom supplies without pre-regulation. |
| VOUT Range | 0.8V to 10V - supports core logic (0.8V–1.2V), I/O (1.8V–3.3V), and intermediate rails (5V, 9V) with single-controller flexibility. |
| IQ (No Load) | 30µA - extends runtime in always-on battery-powered devices such as IoT sensors and portable instrumentation. |
| Switching Frequency | 140kHz to 650kHz (phase-lockable) - balances efficiency (lower f) and component size (higher f) with precise external sync capability. |
| Output Accuracy | ±1% at VFB - ensures reliable system-level voltage margining for microprocessors and FPGAs requiring tight supply tolerance. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation (e.g., 5V→4.95V at high current), critical for post-regulation in high-current applications. |
| Package | 20-pin 4mm × 5mm QFN (UFD) with exposed thermal pad - provides low θJA = 37°C/W for thermally constrained PCB layouts. |
Pinout & Package
20-pin 4mm × 5mm plastic QFN (UFD) package with exposed SGND pad (Pin 21) requiring solder connection to PCB for thermal and electrical integrity. θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (Pin 19) | Open-drain clock output | Drives PolyPhase® daisy-chain of additional controllers; requires external pull-up for level translation and timing coordination. |
| ITH (Pin 1) | Error amplifier output / compensation node | Sets peak inductor current threshold; connects to RC network for OPTI-LOOP® compensation tuning per output capacitor ESR. |
| TRACK/SS (Pin 2) | Soft-start and tracking input | Internal 1µA current source ramps voltage to control VOUT rise time; accepts external resistor divider for supply tracking during power sequencing. |
| VFB (Pin 3) | Feedback input | Compares resistive-divider output against 0.8V reference; ±1% accuracy maintained over temperature and line/load conditions. |
| SGND (Pin 4) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback and error amplifier paths. |
| PGND (Pin 5) | Power ground | Return path for bottom MOSFET source, Schottky anode, and input capacitor - routed separately from SGND to minimize ground bounce. |
| BG (Pin 6) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing = 0V to INTVCC (5.25V/7.5V), rated for 3A peak sink/source. |
| INTVCC (Pin 7) | Internal LDO output | Powers control circuitry and gate drivers; sourced from VIN (5.25V) or EXTVCC (7.5V) depending on EXTVCC voltage level. |
| EXTVCC (Pin 8) | External bias input | Enables higher-efficiency INTVCC sourcing from secondary rail (e.g., 5V output); switchover occurs at 4.7V with 0.2V hysteresis. |
| VIN (Pin 9) | Main input supply | Accepts 4V–36V; bypassed to SGND with ceramic capacitor to suppress high-frequency switching noise. |
| SW (Pin 10) | Switch node | Connects to inductor; voltage swings from ~–0.3V (Schottky drop) to VIN; critical for layout to minimize EMI and shoot-through risk. |
| TG (Pin 11) | Top gate driver output | Floating driver referenced to SW; swing = INTVCC – 0.5V above SW; requires bootstrap capacitor (BOOST–SW) and Schottky diode. |
| BOOST (Pin 12) | Bootstrap supply | Charged via external diode from INTVCC during BG-on phase; sustains TG drive during high-duty-cycle operation. |
| RUN (Pin 13) | Enable/disable control | Logic-compatible input; <0.7V disables controller, reducing IQ to 4µA; internal 0.5µA pull-up enables auto-start when released. |
| SENSE– (Pin 14) | Current sense negative input | High-side current sensing node; differential pair with SENSE+ sets current limit threshold (85–115mV range). |
| SENSE+ (Pin 15) | Current sense positive input | Connected to high-side shunt resistor; total input bias current ≤ –220µA ensures minimal offset error at low currents. |
| PGOOD (Pin 16) | Power-good indicator | Open-drain output asserts low when VFB deviates >±10% from 0.8V; used for system power sequencing and fault reporting. |
| PLLIN/MODE (Pin 17) | Sync input / light-load mode select | Accepts external clock (140–650kHz) for PLL lock; also selects Burst Mode® (<0.7V), pulse-skipping (0.9–INTVCC–0.5V), or continuous (tied to INTVCC). |
| PHASMD (Pin 18) | Phase adjust input | Configures CLKOUT phase offset (0°, 90°, 180°, 270°) relative to TG rising edge for interleaved PolyPhase® multi-phase designs. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows dynamic optimization of transient response across diverse output capacitor types (ceramic, polymer, electrolytic) and ESR values without redesign. |
| 30µA Quiescent Current | Extends battery life in always-on systems (e.g., remote sensors, backup power modules) without sacrificing regulation performance. |
| 99.4% Maximum Duty Cycle | Supports near-unity conversion (e.g., 12V→11.9V) in dropout conditions, eliminating need for linear post-regulators in high-current applications. |
| Programmable Light-Load Modes | Three selectable modes - Burst Mode® (ultra-low IQ), pulse-skipping (low ripple + moderate IQ), or forced continuous (lowest noise) - enable application-specific efficiency/noise trade-offs. |
| Integrated Dual Gate Drivers | Delivers 3A peak current with <90ns rise/fall times (TG/BG), enabling fast switching of low-RDS(on) MOSFETs for high-efficiency, high-current designs. |
| Robust Protection Suite | Includes output overvoltage lockout (OVL), current foldback limiting, undervoltage lockout (UVLO = 3.7V), and thermal shutdown (TJ = 125°C). |
Applications
| Automotive Infotainment Power | Telecom Base Station Bias |
|---|---|
Use Scenario: Supplies 1.1V core and 3.3V I/O rails to SoC and FPGA in head-unit ECUs with cold-crank (4.5V) and load-dump (36V) transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing full power tree; handles wide VIN, monitors PGOOD for safe boot, uses TRACK/SS for controlled sequencing. Use Value: 30µA IQ prevents battery drain during vehicle sleep; 99.4% duty cycle maintains 5V→4.95V output during cranking; ±1% accuracy guarantees SoC stability. |
Use Scenario: Generates 5V/10A intermediate rail from –48V telecom supply (via intermediate stage) for RF amplifiers and data converters. IC Role / Device Role / Timing Role: High-current synchronous controller operating in forced continuous mode to minimize output ripple affecting sensitive analog front-ends. Use Value: Dual N-MOSFET drive supports low RDS(on) FETs for >95% efficiency at full load; phase-lockable frequency avoids beat frequencies with adjacent clock domains. |
| Industrial IoT Sensor Node | Distributed DC Power System |
Use Scenario: Powers ultra-low-power MCU, BLE radio, and MEMS sensor from single Li-ion cell (2.7V–4.2V) with extended shelf life. IC Role / Device Role / Timing Role: Step-down controller configured in Burst Mode® to maintain regulation while drawing only 30µA at no load. Use Value: 4V minimum VIN allows operation down to ~3.8V battery voltage before UVLO; TRACK/SS enables graceful wake-up sequencing; EXTVCC supports self-bias from output. |
Use Scenario: One of multiple synchronized LTC3834EUFD#TRPBF controllers in 4-phase PolyPhase® configuration delivering 12V/60A to server motherboard VRM. IC Role / Device Role / Timing Role: Master/slave phase controller using CLKOUT and PHASMD pins to achieve 90° inter-phase offset and reduce input/output ripple. Use Value: Phase-locking eliminates beat interference; identical UFD packages ensure thermal and layout symmetry; shared PLLIN/MODE simplifies clock distribution. |
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 |
|---|---|---|---|
| MP2918GQ-Z | Fixed 600kHz frequency; no PLL sync; lower IQ (15µA); no EXTVCC; 16-pin QFN | Lacks PolyPhase® support and programmable light-load modes; suited for cost-sensitive, fixed-frequency designs without sync requirements. | Select MP2918GQ-Z when phase synchronization, EXTVCC biasing, or multi-mode light-load control are unnecessary. |
| LTC3892EFE#TRPBF | Wide VIN (4–60V); dual-output; higher IQ (55µA); includes integrated MOSFET drivers with higher current rating | Supports dual independent outputs and higher input voltage; better for 48V industrial or PoE-powered systems requiring redundancy. | Select LTC3892EFE#TRPBF when dual-rail generation, >36V input, or higher gate drive strength is required - not a drop-in replacement. |
Compared with MP2918GQ-Z and LTC3892EFE#TRPBF, the LTC3834EUFD#TRPBF uniquely balances ultra-low IQ, phase-lockable frequency, EXTVCC flexibility, and PolyPhase® scalability - making it optimal for battery-constrained, multi-phase, or telecom-grade synchronous buck designs where timing coordination and efficiency across load range are critical.
Availability
LTC3834EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, telecom base station bias, and industrial IoT sensor node applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant packaging.
Supply support for LTC3834EUFD#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 all Linear ICs including the LTC series.
The LTC3834EUFD#TRPBF belongs to Linear's high-performance power controller family, designed specifically for efficient, flexible, and robust DC/DC conversion in automotive, telecom, and battery-powered systems demanding precision regulation and low quiescent power.
FAQ
What is the absolute maximum input voltage rating for the LTC3834EUFD#TRPBF?
The LTC3834EUFD#TRPBF has an absolute maximum input voltage (VIN) rating of 36V. Exceeding this voltage - even momentarily - risks permanent damage. The device operates over a functional input range of 4V to 36V, with undervoltage lockout (UVLO) releasing at 4.0V (typical) and engaging at 3.7V (min) during ramp-down. Always include transient suppression if interfacing with unregulated sources like automotive batteries.
Does the LTC3834EUFD#TRPBF support true zero-current switching or reverse-current blocking?
The LTC3834EUFD#TRPBF does not implement true zero-current switching (ZCS) or active reverse-current blocking. In Burst Mode® operation, the reverse current comparator disables the bottom MOSFET just before inductor current reaches zero, preventing reversal and enforcing discontinuous conduction. However, it lacks dedicated ZCS control logic or body-diode conduction prevention circuitry found in resonant or hybrid controllers.
Can the LTC3834EUFD#TRPBF be used without an external current sense resistor (RSENSE)?
No - the LTC3834EUFD#TRPBF requires an external current sense resistor (RSENSE) between the SENSE– and SENSE+ pins to set the current limit threshold. The device measures differential voltage across RSENSE (max 115mV) to regulate peak inductor current. There is no internal sense FET or alternative sensing method; omitting RSENSE disables current-mode control and compromises overcurrent protection.
How does the EXTVCC pin affect the INTVCC voltage and overall efficiency of the LTC3834EUFD#TRPBF?
When EXTVCC ≥ 4.7V, the LTC3834EUFD#TRPBF disables its VIN-referenced 5.25V LDO and enables a separate 7.5V LDO powered from EXTVCC. If EXTVCC is 5V–7.5V, INTVCC follows EXTVCC (dropout mode); if EXTVCC > 7.5V (≤10V), INTVCC regulates to 7.5V. This reduces power loss in the internal LDO, improving overall system efficiency - especially when EXTVCC is derived from a high-efficiency secondary rail.
Is the LTC3834EUFD#TRPBF pin-compatible with the LTC3834-1 variant?
No - the LTC3834EUFD#TRPBF is not pin-compatible with the LTC3834-1. The LTC3834-1 uses a 16-pin 3mm × 5mm DFN package (GN16) and omits CLKOUT, EXTVCC, and PGOOD pins. Its pin count, layout, and functionality are reduced; PCB redesign and schematic changes are required for substitution. Only the full-feature LTC3834 variants (FE/UFD) share identical 20-pin pinouts.
LTC3834EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3834EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834EUFD#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 LTC3834EUFD#TRPBF reliable?
The price and inventory of LTC3834EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3834EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834EUFD#TRPBF?
LTC3834EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834EUFD#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 LTC3834EUFD#TRPBF?
For technical support, including LTC3834EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3834EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3834EUFD#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 LTC3834EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3834EUFD#TRPBF?
All LTC3834EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834EUFD#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 LTC3834EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3834EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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