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Analog Devices Inc. LTC3834IFE#TRPBF
- Part No.:
- LTC3834IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3834IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,272
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Product details
Overview
LTC3834IFE#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 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 compact, high-density power supplies for automotive infotainment and telecom base station DC/DC conversion.
For engineers reviewing the LTC3834IFE#TRPBF datasheet, LTC3834IFE#TRPBF pinout, LTC3834IFE#TRPBF application, or LTC3834IFE#TRPBF equivalent, key selection criteria include its OPTI-LOOP® compensation for wide COUT/ESR flexibility, 99% duty cycle dropout capability, selectable light-load modes (Burst Mode®, pulse-skipping, continuous), and PolyPhase® clock output for multi-phase scaling.
Technical Context
The LTC3834IFE#TRPBF implements a constant-frequency current-mode control architecture with a precision 0.8V reference and transconductance error amplifier (gm = 0.5 mmho). Its ITH pin serves as both error amplifier output and current comparator threshold control point, enabling dynamic peak-current regulation across load transients.
It integrates dual gate drivers (TG/BG) with 50ns/40ns typical rise/fall times, internal LDOs for INTVCC (5.25V from VIN or 7.5V from EXTVCC ≥4.7V), and a fully functional phase-locked loop (140–650kHz lock range) with PLLIN/MODE pin dual-role: external clock sync input or light-load mode selector (Burst/Pulse-Skipping/Continuous).
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; ±1% accuracy over line/load/temp. |
| IQ (No Load) | 30µA - extends battery runtime in always-on systems like telematics or remote sensors. |
| fSW Range | 140kHz to 650kHz - adjustable via PLLLPF pin or external sync; enables optimization of size vs. efficiency. |
| Duty Cycle Max | 99.4% - sustains regulation during deep dropout (e.g., VIN = 5V → VOUT = 4.9V). |
| Current Sense | 85–115mV threshold - sets precise foldback limit; supports RSENSE down to 0.012Ω. |
| PGOOD Accuracy | ±10% trip window around VFB - provides reliable system power-good signaling for sequencers. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE) with exposed thermal pad (Pin 21 = SGND), rated for –40°C to +85°C operation. θJA = 35°C/W. Exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (1) | Open-drain clock output | Synchronizes downstream PolyPhase® controllers; supports daisy-chained multi-phase designs. |
| PLLLPF (2) | PLL loop filter node | Configures internal oscillator frequency (250/400/530kHz) or filters external sync signal. |
| ITH (3) | Error amplifier output / current threshold control | Directly sets peak inductor current; used for compensation network connection (OPTI-LOOP®). |
| TRACK/SS (4) | Soft-start & tracking input | Internal 1µA pull-up enables linear VOUT ramp; accepts external voltage for supply tracking. |
| VFB (5) | Feedback input | Compares output voltage (via resistive divider) to 0.8V reference; determines regulation setpoint. |
| SGND (6) | Small-signal ground | Reference for analog circuitry; must be isolated from PGND to avoid noise coupling. |
| PGND (7) | Power ground | Return path for bottom MOSFET, input capacitor, and Schottky rectifier (if used). |
| BG (8) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing = 0V to INTVCC. |
| INTVCC (9) | Internal LDO output | Powers control logic and gate drivers; sourced from VIN (5.25V) or EXTVCC (7.5V) if ≥4.7V. |
| EXTVCC (10) | External VCC input | Enables higher-efficiency biasing from secondary rail; switchover at 4.7V with 0.2V hysteresis. |
| VIN (11) | Main input supply | Primary power source; bypassed to SGND with ceramic capacitor near pin. |
| SW (12) | Switch node | Connects to inductor and BOOST capacitor; swings from ~–0.4V (Schottky drop) to VIN. |
| TG (13) | Top gate driver output | Floating driver for N-MOSFET; swing = SW + (INTVCC – 0.5V); requires bootstrap capacitor. |
| BOOST (14) | Bootstrap supply | Charged via external diode from INTVCC; maintains TG drive during high-duty cycles. |
| RUN (15) | Enable/shutdown control | Logic-level input; <0.7V disables controller, reducing IQ to 4µA. |
| SENSE– (16) | Current sense negative input | Differential input to current comparator; referenced to SENSE+ for RSENSE measurement. |
| SENSE+ (17) | Current sense positive input | High-side or low-side current sense node; total bias current ≤ –220µA. |
| PGOOD (18) | Power-good indicator | Open-drain output pulled low when VFB deviates >±10% from 0.8V; drives external logic. |
| PLLIN/MODE (19) | Sync input / light-load mode select | Accepts external clock (140–650kHz) or sets Burst/Pulse-Skipping/Continuous mode. |
| PHASMD (20) | Phase modulation control | Adjusts CLKOUT phase relative to TG edge (0°, 90°, 180°, 270°) for interleaved PolyPhase®. |
| Exposed Pad (21) | Thermal & signal ground | Must be soldered to PCB copper pour; electrically tied to SGND for noise immunity and cooling. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitance (10µF–1500µF) and ESR ranges without redesign. |
| Selectably Efficient Light-Load Operation | Three modes: Burst Mode® (30µA IQ), Pulse-Skipping (low ripple), or Forced Continuous (audio-quiet). |
| Robust Overvoltage Protection | Hardware-based VFB overvoltage lockout (±12%) prevents damage during feedback fault conditions. |
| Integrated Dual Gate Drivers | Capable of driving 3A peak gate charge with <90ns transitions; includes dead-time control (70ns min). |
| PolyPhase® Clock Distribution | CLKOUT + PHASMD enable precise phase alignment across multiple LTC3834 or compatible controllers. |
| Dropout Recovery Mechanism | Forces periodic top-FET off-time during 99%+ duty cycles to recharge BOOST capacitor and sustain regulation. |
Applications
| Automotive Infotainment Power | Telecom Intermediate Bus Converter |
|---|---|
|
Use Scenario: Powering FPGA, DSP, and display subsystems in head units with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3.3V/5V rails; uses Burst Mode® for standby IQ <30µA. Use Value: Meets automotive cold-crank (4.5V min) with 99.4% duty cycle; OPTI-LOOP® ensures stability with polymer capacitors. |
Use Scenario: Converting –48V telecom rectified bus to +12V intermediate distribution rail in base station shelves. IC Role / Device Role / Timing Role: High-voltage step-down controller driving discrete 100V N-MOSFETs; synchronized via PLLIN/MODE to system clock. Use Value: 36V absolute max VIN rating accommodates transient spikes; 650kHz sync enables interleaving for lower input ripple. |
| Industrial IoT Sensor Hub | Portable Medical Diagnostic Device |
|
Use Scenario: Battery-powered edge node aggregating BLE, LoRa, and environmental sensors with multi-day runtime. IC Role / Device Role / Timing Role: Main system regulator converting Li-ion (3.0–4.2V) to 3.3V; TRACK/SS enables soft-start and supply sequencing. Use Value: 30µA IQ extends battery life; PGOOD enables MCU-controlled power-up validation before sensor initialization. |
Use Scenario: Portable ultrasound or glucose monitor requiring ultra-low-noise 1.8V/2.5V rails from single-cell LiPo. IC Role / Device Role / Timing Role: Low-ripple synchronous controller operating in forced continuous mode to avoid audible switching noise. Use Value: Continuous conduction eliminates subharmonic tones; ±1% VOUT accuracy ensures ADC reference stability. |
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 |
|---|---|---|---|
| LT8640S | Monolithic 4A buck (integrated MOSFETs); 2.8V–42V VIN; 2.5µA IQ; no PLL sync or PolyPhase® support. | Better for space-constrained, medium-current (<4A) designs where layout simplicity outweighs multi-phase scalability. | Choose LT8640S when board area is critical and integrated FETs meet current needs; LTC3834IFE#TRPBF preferred for >5A or multi-phase systems. |
| LTC3891 | 4V–60V VIN; dual-output; includes built-in 5V bias rail; no CLKOUT/PHASMD; 35µA IQ; same OPTI-LOOP®. | Designed for dual-rail industrial systems (e.g., 5V + 3.3V) with extended input range; lacks PolyPhase® clocking. | Choose LTC3891 for dual-output requirements or >36V input; LTC3834IFE#TRPBF remains optimal for single-output, phase-synchronized designs. |
Compared with LT8640S and LTC3891, the LTC3834IFE#TRPBF uniquely combines wide VIN/VOUT flexibility, true PolyPhase® clock distribution, and selectable light-load modes - making it the only choice for scalable, high-current, multi-controller synchronized power systems requiring minimal external components per phase.
Availability
LTC3834IFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, telecom intermediate bus conversion, and portable medical device power supply designs requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade performance.
Supply support for LTC3834IFE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3834IFE#TRPBF belongs to Linear's high-efficiency synchronous controller product line, engineered for demanding DC/DC conversion in automotive, telecom, and industrial systems where precision regulation, low IQ, and multi-phase scalability are essential.
FAQ
What is the maximum supported switching frequency for LTC3834IFE#TRPBF with external synchronization?
The LTC3834IFE#TRPBF guarantees phase-lock capability from 140kHz to 650kHz when an external clock is applied to the PLLIN/MODE pin. The typical capture range extends to 800kHz, but designs requiring guaranteed lock must stay within the 140–650kHz specification. The PLLLPF pin requires an external RC filter for stable lock acquisition and jitter suppression in synchronized operation.
How does the EXTVCC pin affect the INTVCC voltage in LTC3834IFE#TRPBF?
In the LTC3834IFE#TRPBF, the EXTVCC pin controls INTVCC sourcing: when EXTVCC < 4.7V, INTVCC is regulated to 5.25V from VIN; when EXTVCC ≥ 4.7V, the internal LDO switches to EXTVCC, regulating INTVCC to 7.5V if EXTVCC ≥ 7.5V, or tracking EXTVCC (with dropout) if 4.7V ≤ EXTVCC < 7.5V. This allows efficient biasing from a secondary rail.
Can LTC3834IFE#TRPBF operate in dropout, and what mechanism maintains gate drive?
Yes, the LTC3834IFE#TRPBF supports up to 99.4% duty cycle for dropout operation. To sustain TG gate drive when VIN ≈ VOUT, its internal dropout detector forces the top MOSFET off for ~1/12 of the clock period every 10th cycle, allowing the BOOST capacitor to recharge - ensuring reliable high-duty-cycle regulation without external intervention.
What is the function of the TRACK/SS pin in LTC3834IFE#TRPBF beyond soft-start?
Beyond soft-start, the TRACK/SS pin in LTC3834IFE#TRPBF enables supply voltage tracking: connecting an external resistor divider from another rail (e.g., 5V master) to TRACK/SS causes the LTC3834IFE#TRPBF output to ramp in proportion during startup, preventing reverse current or latch-up in cascaded regulators - critical for FPGA or ASIC power sequencing.
Does LTC3834IFE#TRPBF require an external current sense resistor, and what is its typical value range?
Yes, the LTC3834IFE#TRPBF requires an external RSENSE between SENSE+ and SENSE– to measure inductor current. With a 100mV typical current sense threshold, common values range from 0.005Ω (for 20A designs) to 0.05Ω (for 2A designs), balancing accuracy, power loss, and noise immunity. Total sense pin bias current is ≤ –220µA, minimizing offset error.
LTC3834IFE#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
LTC3834IFE#TRPBF FAQ
1.How can I place an order for LTC3834IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834IFE#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 LTC3834IFE#TRPBF reliable?
The price and inventory of LTC3834IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3834IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834IFE#TRPBF?
LTC3834IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834IFE#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 LTC3834IFE#TRPBF?
For technical support, including LTC3834IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3834IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3834IFE#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 LTC3834IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3834IFE#TRPBF?
All LTC3834IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834IFE#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 LTC3834IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3834IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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