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Analog Devices Inc. LTC3834EFE#TRPBF
- Part No.:
- LTC3834EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3834EFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,455
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Product details
Overview
LTC3834EFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, constant-frequency current-mode synchronous step-down controller driving dual N-channel MOSFETs. It delivers 0.8V–10V output from 4V–36V input, achieves ±1% VOUT accuracy, operates with 30µA no-load quiescent current, and supports phase-locked frequencies up to 650kHz - ideal for automotive power rails and telecom DC/DC modules.
For engineers reviewing the LTC3834EFE#TRPBF datasheet, LTC3834EFE#TRPBF pinout, LTC3834EFE#TRPBF application, or LTC3834EFE#TRPBF equivalent, this page provides verified package mapping (20-lead TSSOP), confirmed pin functions including PLLIN/MODE for light-load mode selection, OPTI-LOOP® compensation details, and real-world soft-start/tracking behavior validated in typical applications.
Technical Context
The LTC3834EFE#TRPBF implements a constant-frequency current-mode control architecture with a precision 0.8V reference, enabling tight regulation across wide load and line variations. Its error amplifier drives the ITH pin to modulate peak inductor current, while the internal transconductance amplifier (0.5 mmho) ensures stable loop response over diverse output capacitance and ESR values.
It integrates dual gate drivers (TG/BG) with 50ns rise/fall times, supports external synchronization via PLLIN/MODE (140–650kHz lock range), and features programmable light-load operation - Burst Mode® (30µA IQ), pulse-skipping, or forced continuous conduction - each with distinct ripple, efficiency, and noise trade-offs confirmed in test data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports 12V automotive batteries, 24V industrial rails, and wide-input telecom supplies without pre-regulation. |
| VOUT Range | 0.8V to 10V - enables direct generation of core voltages (e.g., 0.8V for FPGAs) or intermediate rails (3.3V/5V) with single-controller flexibility. |
| Quiescent Current | 30µA at no load - extends battery runtime in always-on systems like telematics or remote sensors. |
| Output Accuracy | ±1% over temperature - ensures reliable margining for ASICs and processors requiring tight voltage tolerance. |
| Switching Frequency | 140kHz to 650kHz (phase-lockable) - balances inductor size (lower f) vs. transient response (higher f) per design requirements. |
| Duty Cycle Max | 99.4% - sustains regulation during deep dropout (e.g., VIN = 4.2V → VOUT = 3.3V), critical for cold-crank automotive conditions. |
| PGOOD Threshold | ±10% on VFB - provides robust power-good signaling for sequenced system startup and fault detection. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), exposed pad (Pin 21) soldered to SGND for thermal and electrical integrity. θJA = 35°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (Pin 1) | Open-drain clock output | Drives CLKIN of downstream PolyPhase® controllers; enables multi-phase synchronization without external logic. |
| ITH (Pin 3) | Error amplifier output / compensation node | Directly sets peak inductor current; connects to RC network for OPTI-LOOP® compensation tuning. |
| TRACK/SS (Pin 4) | Soft-start and tracking input | Internal 1µA pull-up charges external capacitor for linear VOUT ramp; accepts resistor divider for supply tracking. |
| VFB (Pin 5) | Feedback input | Compares against 0.8V reference; senses output via external resistor divider - determines final regulated VOUT. |
| SGND (Pin 6) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback and error amplifier paths. |
| PGND (Pin 7) | Power ground | Return path for bottom MOSFET source, Schottky cathode, and input capacitor - ties to high-current PCB plane. |
| BG (Pin 8) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing = 0V to INTVCC (5.25V or 7.5V). |
| INTVCC (Pin 9) | 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 (Pin 10) | External VCC input | Enables higher-efficiency biasing from an auxiliary rail (e.g., buck output); switchover at 4.7V with 0.2V hysteresis. |
| VIN (Pin 11) | Main input supply | Primary power source; requires local ceramic bypass to SGND to suppress switching noise. |
| SW (Pin 12) | Switch node | Connects to inductor and top MOSFET drain; swings from ~–0.3V (Schottky drop) to VIN - critical for layout and EMI control. |
| TG (Pin 13) | Top gate driver output | Floating driver output; swing = SW + (INTVCC – 0.5V) - requires bootstrap capacitor (BOOST–SW) and Schottky diode. |
| BOOST (Pin 14) | Bootstrap supply | Charged via external diode from INTVCC during BG-on phase; sustains TG drive during high-duty-cycle operation. |
| RUN (Pin 15) | Enable/disable control | Logic-level shutdown: <0.7V disables controller, reducing IQ to 4µA; internal 0.5µA pull-up enables automatic restart. |
| SENSE– (Pin 16) | Current sense negative input | Low-side current sensing node; used with SENSE+ and RSENSE to set current limit threshold (85–115mV). |
| SENSE+ (Pin 17) | Current sense positive input | Connects to high-side of RSENSE; differential input rejects common-mode noise in high-dI/dt paths. |
| PGOOD (Pin 18) | Power-good indicator | Open-drain output pulled low when VFB deviates >±10% from 0.8V - signals MCU or PMIC for sequencing. |
| PLLIN/MODE (Pin 19) | Synchronization input / light-load mode select | Accepts external clock (140–650kHz) for PLL lock; also selects Burst Mode® (<0.8V), pulse-skip (0.8–INTVCC–0.5V), or continuous (INTVCC). |
| PHASMD (Pin 20) | Phase modulation control | Adjusts CLKOUT phase relative to TG edge (0°, 90°, 180°, 270°) for interleaved multi-phase designs. |
| Exposed Pad (Pin 21) | SGND thermal pad | Must be soldered to large SGND copper area - essential for thermal performance and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Minimizes required output capacitance by optimizing transient response across wide COUT/ESR ranges - reduces BOM cost and board space. |
| 30µA Quiescent Current | Extends battery life in always-on systems (e.g., vehicle event recorders) without sacrificing regulation accuracy or start-up speed. |
| 99.4% Maximum Duty Cycle | Enables ultra-low dropout operation (e.g., 4.2V → 3.3V) - maintains regulation during automotive cold-crank events. |
| Programmable Light-Load Modes | Three selectable modes (Burst, pulse-skip, continuous) let designers optimize for efficiency, ripple, or EMI per application constraints. |
| Integrated Power-Good Monitoring | Hardware-based VFB window comparator eliminates need for external supervisor IC in safety-critical power sequencing. |
| EXTVCC Switchover LDO | Reduces power loss by sourcing INTVCC from efficient auxiliary rail instead of main VIN - improves overall system efficiency. |
Applications
| Automotive Infotainment Power Supply | Telecom Intermediate Bus Converter |
|---|---|
|
Use Scenario: Powers DSP, FPGA, and memory in head-unit systems requiring stable 1.2V/3.3V rails from 9–16V battery with cold-crank support. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, low-noise conversion with precise sequencing via PGOOD and TRACK/SS. Use Value: 99.4% duty cycle sustains regulation down to 4.2V input; 30µA IQ preserves battery during sleep mode; ±1% accuracy meets processor voltage margining specs. |
Use Scenario: Generates 5V/12V intermediate bus from 48V telecom rectifier for downstream point-of-load regulators. IC Role / Device Role / Timing Role: High-voltage, high-efficiency controller operating at 300kHz to balance efficiency and magnetics size in distributed power architecture. Use Value: 4V–36V input range accommodates 48V-derived rails with derating; phase-lock capability enables synchronized multi-rail converters to reduce input ripple. |
| Battery-Powered Test Equipment | Distributed DC Power System |
|
Use Scenario: Powers portable oscilloscope or spectrum analyzer with mixed analog/digital rails from Li-ion (3.0–4.2V) or 2-cell pack (6–8.4V). IC Role / Device Role / Timing Role: Step-down controller delivering low-noise, tightly regulated outputs using Burst Mode® to maximize runtime between charges. Use Value: 30µA IQ extends operational time; adjustable soft-start prevents inrush into capacitive loads; OPTI-LOOP® ensures stability with polymer capacitors. |
Use Scenario: Provides redundant 3.3V/5V rails across multiple PCBs in industrial PLC backplane with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: Controller in PolyPhase® configuration using CLKOUT/PHASMD to interleave phases and reduce input/output ripple. Use Value: Clock output enables precise phase alignment across boards; EXTVCC option allows biasing from local 5V rail - improving efficiency and thermal 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 |
|---|---|---|---|
| LTC3833EFE#TRPBF | Single-phase only; no CLKOUT, PHASMD, or PLLIN/MODE sync capability; fixed 550kHz frequency; no EXTVCC pin. | Lacks PolyPhase® support and external synchronization - suitable only for standalone, non-interleaved designs. | Select when multi-phase coordination or external clock sync is unnecessary and board space is constrained. |
| LTC3855EUFD#TRPBF | 4mm × 5mm QFN package; integrated MOSFET drivers with higher peak current (4A); supports 0.6V reference; wider fSW range (200kHz–1MHz). | Higher integration reduces external component count but increases thermal density; optimized for compact, high-current designs. | Choose for space-constrained applications needing higher drive strength and tighter VREF (0.6V) for sub-1V cores. |
Compared with LTC3833EFE#TRPBF and LTC3855EUFD#TRPBF, the LTC3834EFE#TRPBF uniquely combines PolyPhase® daisy-chaining, full light-load mode selection, and EXTVCC flexibility in a mature TSSOP package - making it optimal for scalable, thermally managed, and battery-sensitive multi-rail systems.
Availability
LTC3834EFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, telecom intermediate bus converters, and battery-operated test equipment requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for LTC3834EFE#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 qualification and long-term product support.
The LTC3834EFE#TRPBF belongs to Linear's high-efficiency synchronous controller family, designed specifically for demanding automotive, telecom, and industrial DC/DC applications where low IQ, wide input range, and precise regulation are critical.
FAQ
What is the maximum supported switching frequency for LTC3834EFE#TRPBF?
The LTC3834EFE#TRPBF supports a phase-lockable switching frequency range of 140kHz to 650kHz. When not synchronized, it operates at fixed frequencies (250kHz, 400kHz, or 530kHz) based on the PLLLPF pin connection. The 650kHz upper limit is guaranteed for PLL lock under all operating conditions per the datasheet.
Does LTC3834EFE#TRPBF support output voltage tracking during startup?
Yes, the LTC3834EFE#TRPBF supports output voltage tracking via the TRACK/SS pin. Connecting an external resistor divider from another supply to TRACK/SS causes VOUT to ramp in proportion during startup - a feature validated in Linear's typical application circuits and used in multi-rail FPGA power sequencing.
How does the EXTVCC pin improve efficiency in LTC3834EFE#TRPBF designs?
The EXTVCC pin allows the LTC3834EFE#TRPBF to source its INTVCC bias from an efficient auxiliary rail (e.g., a downstream buck output) instead of VIN. When EXTVCC exceeds 4.7V, the internal LDO switches from 5.25V (VIN-sourced) to 7.5V (EXTVCC-sourced), reducing power loss and heat generation in high-current applications.
Can LTC3834EFE#TRPBF operate in dropout with 99% duty cycle?
Yes, the LTC3834EFE#TRPBF supports up to 99.4% duty cycle, enabling operation in dropout (e.g., VIN = 4.2V → VOUT = 3.3V). Its dropout detector forces periodic bottom-FET off-time to recharge the BOOST capacitor, ensuring reliable gate drive even at extreme duty cycles - confirmed in datasheet Figure 11 and electrical characteristics.
What are the three light-load operating modes of LTC3834EFE#TRPBF and how are they selected?
The LTC3834EFE#TRPBF offers Burst Mode®, pulse-skipping, and forced continuous conduction - selected via the PLLIN/MODE pin: <0.8V enables Burst Mode® (30µA IQ), 0.8V–(INTVCC–0.5V) enables pulse-skip, and tying to INTVCC forces continuous mode. Each mode's behavior and efficiency curves are documented in Figures G01–G03 and the Applications section.
LTC3834EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3834EFE#TRPBF FAQ
1.How can I place an order for LTC3834EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834EFE#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 LTC3834EFE#TRPBF reliable?
The price and inventory of LTC3834EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3834EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834EFE#TRPBF transactions.
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4.How is shipping managed for LTC3834EFE#TRPBF?
LTC3834EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834EFE#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 LTC3834EFE#TRPBF?
For technical support, including LTC3834EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3834EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3834EFE#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 LTC3834EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3834EFE#TRPBF?
All LTC3834EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834EFE#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 LTC3834EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3834EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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