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Analog Devices Inc. LTC3834EFE#PBF
- Part No.:
- LTC3834EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3834EFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,559
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Product details
Overview
LTC3834EFE#PBF 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 infotainment power rails requiring low IQ and wide VIN.
For engineers reviewing the LTC3834EFE#PBF datasheet, LTC3834EFE#PBF pinout, LTC3834EFE#PBF application, or LTC3834EFE#PBF 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 telecom and battery-powered digital systems.
Technical Context
The LTC3834EFE#PBF implements a constant-frequency current-mode control architecture with an internal 0.8V precision reference, error amplifier output at ITH, and differential current sensing via SENSE+/SENSE–. Its OPTI-LOOP® compensation allows stable loop response across wide output capacitance and ESR ranges without external type-II/III networks.
It integrates dual gate drivers (TG/BG) with 70ns dead-time control, internal LDOs powering INTVCC from VIN or EXTVCC (switchover at 4.7V), and a phase-locked loop supporting synchronization from 140kHz to 650kHz. The RUN pin enables shutdown with 4µA IQ, while TRACK/SS supports linear soft-start or supply tracking via internal 1µA pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports 12V automotive, 24V industrial, and multi-cell Li-ion battery inputs without pre-regulation. |
| VOUT Range | 0.8V to 10V - programmable via external resistor divider; 0.8V reference enables precise low-voltage core supplies. |
| IQ (No Load) | 30µA - extends runtime in always-on battery systems such as telematics or remote sensors. |
| fSW Range | 140kHz to 650kHz - adjustable via PLLLPF; fixed options at 250/400/530kHz when floating or tied to GND/INTVCC/SGND. |
| Output Accuracy | ±1% over line/load/temperature - ensures reliable voltage margining for FPGA, ASIC, and DSP core rails. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation (e.g., 5V→4.95V at high load) without external diode. |
| PGOOD Threshold | ±10% on VFB - provides accurate power-good assertion for system sequencers and microcontroller reset logic. |
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 | Synchronizes PolyPhase® multi-controller stacks; daisy-chains additional LTC3834 or compatible controllers. |
| ITH (Pin 3) | Error amplifier output / compensation node | Controls peak inductor current; connects to OPTI-LOOP® network for transient optimization across COUT variations. |
| TRACK/SS (Pin 4) | Soft-start and tracking input | Internal 1µA pull-up enables linear ramp; accepts external voltage divider for supply tracking during power-up sequencing. |
| VFB (Pin 5) | Feedback input | Compares against 0.8V reference; senses remote output voltage via resistive divider for tight regulation under layout parasitics. |
| 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 - critical for current-sense accuracy. |
| 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 INTVCC sourcing from regulated auxiliary rail (e.g., downstream converter output). |
| VIN (Pin 11) | Main input supply | Accepts 4V–36V; requires local ceramic bypass to SGND for high-frequency stability. |
| SW (Pin 12) | Switch node | Connects to inductor and bootstrap capacitor; swings from ~–0.3V (Schottky drop) to VIN. |
| TG (Pin 13) | Top gate driver output | Floating driver output referenced to SW; swing = SW to (SW + INTVCC – 0.5V). |
| BOOST (Pin 14) | Bootstrap supply | Charged via external diode from INTVCC; sustains TG drive during continuous conduction or dropout. |
| RUN (Pin 15) | Enable/shutdown control | Logic-level input; <0.7V disables controller and reduces IQ to 4µA; internal 0.5µA pull-up enables auto-start. |
| SENSE– (Pin 16) | Current sense negative input | Low-side current sense node; used with SENSE+ to detect MOSFET RDS(on) or discrete shunt voltage. |
| SENSE+ (Pin 17) | Current sense positive input | High-side current sense node; differential pair sets current limit threshold (85–115mV typ). |
| PGOOD (Pin 18) | Power-good indicator | Open-drain output asserts low when VFB deviates >±10% from 0.8V; drives external enable or reset logic. |
| PLLIN/MODE (Pin 19) | PLL sync input / light-load mode select | Accepts external clock (140–650kHz); also selects Burst Mode (<0.8V), pulse-skipping (0.8–INTVCC–0.5V), or forced continuous (tied to INTVCC). |
| PHASMD (Pin 20) | Phase modulation control | Adjusts CLKOUT phase relative to TG edge (0°, 90°, 180°, 270°) for interleaved PolyPhase® designs. |
| Exposed Pad (Pin 21) | SGND thermal pad | Must be soldered to PCB ground plane for thermal dissipation and noise reduction; electrically connected to SGND. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Eliminates need for complex type-II/type-III networks; stabilizes loop across 10µF–1000µF COUT and 1mΩ–100mΩ ESR. |
| 30µA Quiescent Current | Extends battery life in always-on applications (e.g., GPS trackers, IoT sensors) without sacrificing fast transient response. |
| 99.4% Maximum Duty Cycle | Supports near-unity conversion (e.g., 12V→11.9V) without external body-diode conduction loss or efficiency collapse. |
| Programmable Light-Load Modes | Selectable Burst Mode® (30µA IQ), pulse-skipping (low ripple), or forced continuous (audio-noise sensitive loads). |
| Integrated Dual Gate Drivers | Delivers 3A peak current with matched 70ns dead time; eliminates need for external drivers in medium-power designs. |
| EXTVCC Switchover LDO | Reduces power loss by sourcing INTVCC from efficient auxiliary rail instead of main VIN, improving overall system efficiency. |
Applications
| Automotive Infotainment Power | Telecom Base Station Bias |
|---|---|
|
Use Scenario: Powers DSP, FPGA, and display interface ICs in head units with cold-crank (4.5V) and load-dump (36V) tolerance. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3.3V/5V rails; manages sequencing via TRACK/SS and monitors health via PGOOD. Use Value: 30µA IQ preserves battery during park mode; 99.4% duty cycle maintains 5V output during engine cranking at 6V input. |
Use Scenario: Generates intermediate 5V/12V rails for RF front-end amplifiers and baseband processors in 4G/5G macrocells. IC Role / Device Role / Timing Role: High-efficiency controller synchronized to system clock via PLLIN/MODE to reduce conducted EMI in dense RF environments. Use Value: Phase-lockable 140–650kHz operation avoids sensitive IF bands; ±1% accuracy ensures stable bias for GaN PA stages. |
| Battery-Powered Test Equipment | Distributed DC Power Systems |
|
Use Scenario: Supplies analog front-end, ADC, and microcontroller in handheld oscilloscopes and multimeters powered by Li-ion packs. IC Role / Device Role / Timing Role: Step-down controller with soft-start (TRACK/SS) and low-noise forced continuous mode for precision analog signal chains. Use Value: Adjustable light-load mode minimizes ripple-induced measurement errors; 0.8V reference enables accurate 1.8V/2.5V core voltages. |
Use Scenario: Provides point-of-load regulation in modular server PSUs or industrial PLC backplanes with shared 12V/48V bus. IC Role / Device Role / Timing Role: PolyPhase® master controller using CLKOUT/PHASMD to synchronize up to 4 phases for >30A output with reduced input/output ripple. Use Value: Interleaved operation cuts input capacitor RMS current by 50%; EXTVCC support enables efficient cascaded topology from upstream converter. |
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 |
|---|---|---|---|
| LTC3834EUFD#PBF | Same die in 4mm × 5mm QFN-20 package; θJA = 37°C/W; exposed pad = SGND. | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile. | Select for higher power density or improved thermal management; not pin-compatible with TSSOP due to different pin numbering. |
| LTC3834-1EFE#PBF | Reduced-feature variant: no CLKOUT, no EXTVCC, no PGOOD; 16-pin DFN (3mm × 5mm); no PHASMD or PLLIN/MODE sync capability. | Targeted at cost-sensitive, single-phase, non-synchronized applications with simpler sequencing requirements. | Choose only if PolyPhase®, external clock sync, or auxiliary rail powering are unnecessary; not functionally equivalent. |
Compared with LTC3834EFE#PBF, the QFN variant offers superior thermal resistance but demands layout revision, while the LTC3834-1 sacrifices synchronization, monitoring, and flexibility for footprint and BOM cost reduction - neither is a drop-in replacement.
Availability
LTC3834EFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment power, telecom base station bias, and battery-powered test equipment requiring stable component supply, long-lifecycle assurance, and full temperature-range (-40°C to 85°C) qualification.
Supply support for LTC3834EFE#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 its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3834 belongs to Linear's high-efficiency synchronous controller family, designed specifically for demanding DC/DC conversion in automotive, telecom, and portable systems where low IQ, wide VIN, and precise regulation are critical.
FAQ
What is the absolute maximum input voltage rating for the LTC3834EFE#PBF?
The LTC3834EFE#PBF has an absolute maximum input voltage (VIN) rating of 36V. Exceeding this voltage - even momentarily - may cause permanent damage. This rating applies to the VIN pin only; BOOST must not exceed 42V, and SW must remain within –5V to 36V. Always observe derating guidelines per application environment and ensure proper transient suppression on the input rail.
Does the LTC3834EFE#PBF support output voltage tracking during power-up?
Yes, the LTC3834EFE#PBF supports output voltage tracking via the TRACK/SS pin. When an external resistor divider from a master supply is connected to TRACK/SS, the LTC3834EFE#PBF regulates VFB to match that voltage until it reaches 0.8V, enabling coordinated start-up with other rails. Internal 1µA pull-up also allows capacitor-based soft-start with linear ramp rate.
How does the EXTVCC pin affect the INTVCC regulator operation in the LTC3834EFE#PBF?
In the LTC3834EFE#PBF, the EXTVCC pin controls INTVCC sourcing: when EXTVCC < 4.7V, the internal 5.25V LDO powers INTVCC from VIN; when EXTVCC ≥ 4.7V, the 7.5V LDO activates and sources INTVCC from EXTVCC. If EXTVCC is between 4.7V and 7.5V, INTVCC follows EXTVCC in dropout; above 7.5V, INTVCC is regulated to 7.5V (max 10V allowed).
Can the LTC3834EFE#PBF be synchronized to an external clock, and what is the guaranteed lock range?
Yes, the LTC3834EFE#PBF can be synchronized via the PLLIN/MODE pin. Its phase-locked loop guarantees lock to external clocks between 140kHz and 650kHz. A series RC filter on PLLLPF sets loop bandwidth. Outside this range, synchronization is not assured - design validation is required for frequencies beyond these limits.
What is the purpose of the PHASMD pin on the LTC3834EFE#PBF, and how is it used in PolyPhase® configurations?
The PHASMD pin on the LTC3834EFE#PBF selects CLKOUT phase offset relative to the TG rising edge: logic low = 0°, high = 180°, and toggling synchronously with CLKOUT yields 90° or 270°. In PolyPhase® designs, this enables precise interleaving across multiple LTC3834EFE#PBF controllers to reduce input/output ripple and improve thermal distribution.
LTC3834EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3834EFE#PBF FAQ
1.How can I place an order for LTC3834EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834EFE#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 LTC3834EFE#PBF reliable?
The price and inventory of LTC3834EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3834EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834EFE#PBF?
LTC3834EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834EFE#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 LTC3834EFE#PBF?
For technical support, including LTC3834EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834EFE#PBF requirements.
6.How does Aetrix verify that LTC3834EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3834EFE#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 LTC3834EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3834EFE#PBF?
All LTC3834EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834EFE#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 LTC3834EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3834EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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