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Analog Devices Inc. LTC3834IFE#PBF
- Part No.:
- LTC3834IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3834IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,462
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Product details
Overview
LTC3834IFE#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% output accuracy, operates with 30µA no-load quiescent current, and supports phase-locked synchronization up to 650kHz - enabling efficient power conversion in automotive infotainment systems requiring low standby power and precise voltage regulation.
For engineers reviewing the LTC3834IFE#PBF datasheet, LTC3834IFE#PBF pinout, LTC3834IFE#PBF application, or LTC3834IFE#PBF equivalent, this page provides verified technical context, validated package mapping, confirmed pin functions, real-world application scenarios, and two rigorously cross-checked alternative parts for battery-powered telecom and distributed DC power systems.
Technical Context
The LTC3834IFE#PBF implements a constant-frequency current-mode control architecture with an internal 0.8V precision reference, OPTI-LOOP® compensation for wide-range capacitor/ESR optimization, and selectable light-load operation (Burst Mode®, pulse-skipping, or forced continuous). Its error amplifier drives the ITH pin to modulate peak inductor current based on VFB feedback deviation.
It integrates dual gate drivers (TG/BG) with 70ns dead-time control, internal LDOs for INTVCC (5.25V or 7.5V selectable via EXTVCC), and a phase-locked loop supporting external clock synchronization from 140kHz to 650kHz. The PGOOD output monitors VFB within ±10%, and output overvoltage protection triggers at +12% VFB deviation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V automotive batteries and 24V industrial rails without pre-regulation. |
| Output Voltage Range | 0.8V ≤ VOUT ≤ 10V - enables direct generation of core logic (0.8V), I/O (1.8V/3.3V), and analog (5V/10V) rails. |
| No-Load Quiescent Current | 30µA - extends runtime in always-on battery systems such as telematics modules. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable microcontroller core voltage under thermal stress. |
| Switching Frequency Range | 140kHz to 650kHz (phase-lockable) - balances efficiency (low f) vs. size (high f) in space-constrained PCB layouts. |
| Duty Cycle Capability | Up to 99.4% - supports ultra-low dropout operation during cold-crank (VIN = 4.5V, VOUT = 3.3V). |
| Current Sense Threshold | 85mV to 115mV - sets accurate current limiting across temperature with minimal RSENSE power loss. |
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 PolyPhase® daisy-chain synchronization; requires external pull-up for level translation. |
| PLLLPF (Pin 2) | PLL loop filter node | Connects RC network to set PLL bandwidth when synchronizing to external clock (140–650kHz). |
| ITH (Pin 3) | Error amplifier output / compensation node | Controls peak inductor current; connects to RC network for OPTI-LOOP® transient response tuning. |
| TRACK/SS (Pin 4) | Soft-start and tracking input | Internal 1µA current source ramps voltage; enables controlled startup or voltage tracking of another rail. |
| VFB (Pin 5) | Feedback input | Compares divided output voltage against 0.8V reference; ±1% accuracy ensures tight regulation. |
| SGND (Pin 6) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback and control loops. |
| PGND (Pin 7) | Power ground | Return path for bottom MOSFET source, Schottky cathode, and input capacitor negative terminal. |
| BG (Pin 8) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing = 0V to INTVCC (5.25V/7.5V). |
| INTVCC (Pin 9) | Internal LDO output | Powers control circuitry and gate drivers; requires ≥4.7µF ceramic/tantalum decoupling to PGND. |
| EXTVCC (Pin 10) | External VCC input | Enables higher-efficiency INTVCC sourcing from secondary rail (e.g., 5V buck output) above 4.7V. |
| VIN (Pin 11) | Main input supply | Accepts 4–36V; bypass capacitor mandatory between VIN and SGND for stability. |
| SW (Pin 12) | Switch node | Connects to inductor; voltage swings from ~–0.3V (Schottky drop) to VIN; critical for layout EMI control. |
| TG (Pin 13) | Top gate driver output | Floating driver output; swing = SW + (INTVCC – 0.5V); requires bootstrap capacitor (BOOST–SW). |
| BOOST (Pin 14) | Bootstrap supply | Charged via external diode from INTVCC; sustains TG drive during high-duty-cycle operation. |
| RUN (Pin 15) | Enable/shutdown control | Logic-low (<0.7V) disables controller and reduces IQ to 4µA; internal 0.5µA pull-up enables auto-start. |
| SENSE– (Pin 16) | Current sense negative input | Connects to low-side of RSENSE; differential pair with SENSE+ sets current limit threshold. |
| SENSE+ (Pin 17) | Current sense positive input | Connects to high-side of RSENSE; common-mode range up to 11V supports high-side sensing. |
| PGOOD (Pin 18) | Power-good indicator | Open-drain output pulled low when VFB deviates >±10% from 0.8V; requires external pull-up. |
| PLLIN/MODE (Pin 19) | PLL sync input / light-load mode select | Accepts external clock (140–650kHz) or sets Burst Mode® (GND), pulse-skip (0.9–INTVCC–0.5V), or forced continuous (INTVCC). |
| PHASMD (Pin 20) | Phase modulation control | Selects CLKOUT phase offset (0°, 90°, 180°, 270°) for interleaved multi-phase designs. |
| Exposed Pad (Pin 21) | SGND thermal pad | Mandatory PCB solder connection for thermal dissipation and signal ground integrity. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitor values (e.g., 10µF–150µF) and ESR ranges without redesign. |
| 30µA No-Load Quiescent Current | Extends battery life in always-on applications like vehicle event data recorders (EDRs) and GPS trackers. |
| 99.4% Maximum Duty Cycle | Enables operation during automotive cold-crank (VIN = 4.5V) while regulating 3.3V output without dropout. |
| Programmable Light-Load Operation | Three modes (Burst, pulse-skip, forced continuous) let designers trade off efficiency, ripple, and EMI per system requirement. |
| Integrated Dual Gate Drivers | Delivers 3A peak current with <90ns rise/fall times and 70ns dead-time control for robust synchronous FET switching. |
| Output Overvoltage Protection | Shuts down top FET if VFB exceeds +12% of 0.8V, preventing damage to downstream 3.3V or 5V ICs. |
Applications
| Automotive Infotainment Power | Telecom Base Station Bias |
|---|---|
Use Scenario: Powering DSP, FPGA, and display controllers in head units with 12V battery input and strict 30µA sleep current limits. IC Role / Device Role / Timing Role: Primary synchronous step-down controller regulating 1.2V core and 3.3V I/O rails with soft-start sequencing. Use Value: 30µA IQ and 99.4% duty cycle maintain system wakefulness during engine-off battery drain and cold-crank survival. |
Use Scenario: Generating stable 5V bias for RF front-end amplifiers in 48V-powered remote radio heads (RRHs). IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter accepting 36–57V telecom input and delivering regulated 5V at 10A. Use Value: 4V–36V input range covers full -48V telecom range (with proper polarity handling); ±1% accuracy ensures amplifier linearity. |
| Battery-Operated Test Equipment | Distributed DC Power System |
Use Scenario: Portable oscilloscope or spectrum analyzer using Li-ion pack (8.4V–12.6V) to power mixed-signal ADCs and ARM Cortex-M7 SoC. IC Role / Device Role / Timing Role: Dual-output controller (via TRACK/SS) generating sequenced 1.1V core and 3.3V analog supplies. Use Value: Adjustable soft-start prevents inrush current tripping battery protection circuits; OPTI-LOOP® accommodates aging electrolytic output caps. |
Use Scenario: Rack-mounted server shelf with centralized 12V intermediate bus feeding multiple point-of-load converters. IC Role / Device Role / Timing Role: Phase-locked PolyPhase® master controller synchronizing four LTC3834-based 12V→1.8V stages for 100A total load. Use Value: CLKOUT/PHASMD pins enable 90° phase interleaving, reducing input/output ripple and EMI by √N (N=4). |
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 |
|---|---|---|---|
| LTC3833IFE#PBF | Single-phase only; no CLKOUT, PHASMD, or PLLIN/MODE; fixed 500kHz frequency; no EXTVCC pin. | Lacks PolyPhase® capability and external clock sync; suited for simpler single-rail designs without sequencing or multi-phase needs. | Select when cost-sensitive, space-constrained, and phase synchronization is unnecessary. |
| MP2918GL-Z | Monolithic 6A buck regulator (integrated MOSFETs); 4.5–28V input; 0.6–5.5V output; 25µA IQ; no PLL or PolyPhase® support. | Replaces discrete FET + controller solution with smaller footprint but lower max current and no multi-phase scalability. | Select for compact, medium-current (≤6A) applications where board area outweighs flexibility and scalability. |
Compared with LTC3833IFE#PBF, the LTC3834IFE#PBF adds PolyPhase® synchronization and external clock locking for scalable multi-phase designs; compared with MP2918GL-Z, it offers higher current capability, wider input range, and design flexibility via discrete FET selection - critical for high-reliability automotive and telecom systems.
Availability
LTC3834IFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, telecom base station power supplies, and battery-operated portable instrumentation requiring stable component supply, long-term lifecycle assurance, and guaranteed –40°C to +85°C operation.
Supply support for LTC3834IFE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3834IFE#PBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding DC/DC conversion in battery-powered, automotive, and telecom infrastructure applications where low IQ, wide VIN, and precise regulation are essential.
FAQ
What is the maximum supported switching frequency for LTC3834IFE#PBF with external clock synchronization?
The LTC3834IFE#PBF guarantees phase-lock capability from 140kHz to 650kHz when driven by an external clock on the PLLIN/MODE pin. Its typical capture range extends to 800kHz, but designs requiring guaranteed lock must stay within the 140–650kHz specification. The internal oscillator alone operates from 220kHz to 580kHz depending on PLLLPF voltage.
Does LTC3834IFE#PBF support output voltage tracking, and how is it implemented?
Yes, LTC3834IFE#PBF supports output voltage tracking via the TRACK/SS pin. Connecting an external resistor divider from a master supply to TRACK/SS causes the LTC3834IFE#PBF output to ramp in proportion during startup. Internally, the controller regulates VFB to the smaller of 0.8V or the TRACK/SS voltage, enabling precise sequencing with other rails.
What is the purpose of the EXTVCC pin on LTC3834IFE#PBF, and what voltage range is acceptable?
The EXTVCC pin on LTC3834IFE#PBF allows sourcing INTVCC from an external 4.7V–10V supply instead of VIN, improving efficiency when a clean, regulated secondary rail (e.g., 5V buck output) is available. Below 4.7V, the internal 5.25V LDO from VIN activates; above 4.7V, a 7.5V LDO engages - regulated to 7.5V if EXTVCC > 7.5V.
How does LTC3834IFE#PBF achieve 30µA quiescent current, and under what conditions is it valid?
LTC3834IFE#PBF achieves 30µA quiescent current in Burst Mode® operation at light loads, where internal circuitry enters "sleep" mode and the ITH pin is parked at 0.425V. This value is specified at TA = 25°C with VIN = 12V and no load; shutdown IQ drops further to 4µA when RUN < 0.7V.
Can LTC3834IFE#PBF drive high-side and low-side N-channel MOSFETs simultaneously, and what gate drive features ensure reliability?
Yes, LTC3834IFE#PBF integrates dual N-channel gate drivers (TG and BG) with matched 70ns dead-time control to prevent shoot-through. TG provides floating drive referenced to SW with 3A peak current and <90ns transitions; BG delivers 0V–INTVCC swing. Internal LDOs (5.25V/7.5V) ensure robust gate overdrive across input and load conditions.
LTC3834IFE#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
LTC3834IFE#PBF FAQ
1.How can I place an order for LTC3834IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834IFE#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 LTC3834IFE#PBF reliable?
The price and inventory of LTC3834IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3834IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834IFE#PBF?
LTC3834IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834IFE#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 LTC3834IFE#PBF?
For technical support, including LTC3834IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834IFE#PBF requirements.
6.How does Aetrix verify that LTC3834IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3834IFE#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 LTC3834IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3834IFE#PBF?
All LTC3834IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834IFE#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 LTC3834IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3834IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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