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Analog Devices Inc. LTC3834IDHC-1#TRPBF
- Part No.:
- LTC3834IDHC-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3834IDHC-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,648
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Product details
Overview
LTC3834IDHC-1#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 to 10V output voltage from 4V–36V input, achieves ±1% output accuracy, operates with 30μA no-load quiescent current, and supports phase-lockable switching frequencies from 140kHz to 650kHz - enabling use in battery-powered telecom and automotive power systems.
For engineers reviewing the LTC3834IDHC-1#TRPBF datasheet, LTC3834IDHC-1#TRPBF pinout, LTC3834IDHC-1#TRPBF application, or LTC3834IDHC-1#TRPBF equivalent, key selection criteria include its 30μA IQ, 99% duty cycle dropout capability, OPTI-LOOP® compensation for wide COUT/ESR tolerance, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and absence of CLKOUT, EXTVCC, and PGOOD pins versus the LTC3834.
Technical Context
The LTC3834IDHC-1#TRPBF implements a constant-frequency current-mode architecture with internal 0.8V reference and transconductance error amplifier (gm = 0.5 mmho). Its OPTI-LOOP® compensation allows stable loop response across broad output capacitance and ESR ranges without external type-II/type-III network redesign.
It features dual gate drivers (TG/BG) with 50–90ns transition times, programmable soft-start/tracking via 1.1μA TRACK/SS pull-up, and precision current sensing with 100mV maximum threshold at SENSE+/- pins. Light-load behavior is controlled exclusively by PLLIN/MODE pin state - no CLKOUT or EXTVCC support distinguishes it from the full-feature LTC3834.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports 12V/24V automotive, telecom, and wide-input industrial rails. |
| IQ (No Load) | 30μA - extends battery runtime in always-on systems like telematics or remote sensors. |
| VOUT Accuracy | ±1% over temp - ensures reliable regulation for FPGA core, DSP, or ASIC supply rails. |
| Switching Frequency | 140kHz–650kHz (phase-lockable) - enables optimization of size vs. efficiency; 400kHz nominal when PLLLPF floating. |
| Duty Cycle Max | 99.4% - sustains regulation down to VOUT ≈ VIN – 0.3V, critical for low-dropout battery backup paths. |
| Current Sense Threshold | 85–115mV - sets peak inductor current with RSENSE; supports IMAX up to ~20A depending on layout and MOSFET RDS(on). |
| Package | 16-pin 5mm × 3mm DFN - exposed pad (Pin 17) must be soldered to SGND for thermal and electrical integrity. |
Pinout & Package
16-lead plastic DFN (5mm × 3mm) with exposed thermal pad (Pin 17 = SGND). Requires PCB soldering of exposed pad for thermal dissipation (θJA = 43.5°C/W) and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (1) | PLL low-pass filter node | DC bias sets nominal frequency (250/400/530kHz); RC filter required for external clock sync. |
| ITH (2) | Error amplifier output / compensation node | Controls peak inductor current; connects to OPTI-LOOP® network for transient optimization. |
| TRACK/SS (3) | Soft-start & tracking input | Internal 1.1μA pull-up ramps VOUT; external divider enables supply tracking during startup. |
| VFB (4) | Feedback sense input | Compares to 0.8V reference; sets output voltage via external resistor divider (e.g., 10k/10k for 1.6V). |
| SGND (5) | Small-signal ground | Must be routed separately from PGND to avoid noise coupling into feedback path. |
| PGND (6) | Power ground return | Connects to bottom MOSFET source, Schottky cathode, and CIN(–) - high di/dt path. |
| BG (7) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing = 0V to INTVCC (5.25V). |
| INTVCC (8) | Internal LDO output | 5.25V ±1% regulated supply for logic and drivers; requires ≥4.7μF ceramic/tantalum bypass. |
| VIN (9) | Main input supply | 4V–36V input; powers INTVCC LDO and provides bootstrap recharge path. |
| SW (10) | Switch node | Connects to inductor; voltage swings from ~–0.3V (Schottky drop) to VIN. |
| TG (11) | Top gate driver output | Floating driver output; swing = SW + (INTVCC – 0.5V); drives high-side N-MOSFET gate. |
| BOOST (12) | Bootstrap supply | Capacitor between BOOST and SW supplies TG driver; diode from BOOST to INTVCC recharges cap. |
| RUN (13) | Enable/shutdown control | <0.7V disables controller (IQ = 4μA); internal 0.5μA pull-up enables auto-start. |
| SENSE– (14) | Current sense negative input | Differential input to current comparator; common-mode range = SGND to 10V. |
| SENSE+ (15) | Current sense positive input | Paired with SENSE–; 100mV max threshold defines peak current limit. |
| PLLIN/MODE (16) | Sync input / light-load mode select | Low = Burst Mode; INTVCC = forced continuous; 0.9V–INTVCC–0.5V = pulse-skipping. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable operation with diverse output capacitors (ceramic, polymer, electrolytic) and ESR values without redesigning compensation network. |
| 30μA Quiescent Current | Extends battery life in always-on applications such as GPS trackers or IoT edge nodes operating from Li-ion or 2-cell alkaline. |
| 99.4% Maximum Duty Cycle | Supports ultra-low dropout operation - e.g., 3.3V output from 3.6V input - essential for battery-fuel-gauge or backup rail regulation. |
| Selectably Optimized Light-Load Efficiency | Three distinct modes (Burst/Pulse-Skipping/Continuous) let designers trade off ripple, noise, and efficiency based on system requirements. |
| Phase-Lockable Oscillator (140–650kHz) | Eliminates beat frequencies in multi-rail systems and simplifies EMI filtering by synchronizing to master clock or other converters. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
Use Scenario: Regulating 1.2V/3A core voltage for ARM-based infotainment SoC from 12V battery with cold-crank tolerance down to 4.5V. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load steps and maintaining tight output regulation during engine cranking transients. Use Value: 30μA IQ preserves battery charge during vehicle sleep; 99.4% duty cycle sustains 1.2V output even at 4.5V input; ±1% accuracy ensures SoC stability. | Use Scenario: Generating isolated 5V/2A auxiliary supply for digital I/O isolation barriers in DIN-rail mounted PLCs powered from 24V DC bus. IC Role / Device Role / Timing Role: High-reliability step-down controller driving discrete N-MOSFETs with robust current sensing and OVP protection. Use Value: Wide 4V–36V input handles brownouts and surges; output overvoltage protection prevents damage to downstream optocouplers and isolators. |
| Telecom Remote Radio Unit (RRU) | Portable Medical Diagnostic Device |
Use Scenario: Providing 3.3V/5A supply to FPGA and RF front-end ICs in outdoor macrocell RRUs powered from -48V DC via intermediate 12V bus. IC Role / Device Role / Timing Role: Efficient, phase-locked controller synchronized to system clock to minimize conducted EMI in sensitive RF environment. Use Value: 650kHz sync capability eliminates heterodyne noise; 16-pin DFN enables compact layout near FPGA; ±1% VOUT ensures ADC reference stability. | Use Scenario: Powering 1.8V/1.5A processor and 3.3V/500mA sensor interface in handheld ultrasound probe operating from single-cell Li-Po (3.0–4.2V). IC Role / Device Role / Timing Role: Low-IQ buck controller enabling >72-hour standby; soft-start prevents inrush into capacitive medical sensor loads. Use Value: 30μA IQ maximizes battery life; TRACK/SS pin enables controlled ramp for analog front-end bias sequencing; 99% duty cycle maintains 1.8V output at end-of-discharge. |
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 |
|---|---|---|---|
| LTC3834EDHC-1#TRPBF | Same functionality but rated for 0°C to 85°C (vs. –40°C to 85°C for LTC3834IDHC-1#TRPBF); identical pinout and electrical specs. | Suitable for commercial-temperature environments only; not qualified for automotive or extended industrial use. | Select when ambient temperature stays above 0°C and cost sensitivity outweighs extended temp qualification. |
| MP2918GL-Z | Monolithic 30V synchronous buck controller with integrated MOSFET drivers; lacks PLL sync, TRACK/SS, and OPTI-LOOP®; IQ = 45μA. | Reduces BOM count but offers less flexibility in compensation, soft-start, and synchronization; lower max frequency (500kHz). | Choose for space-constrained designs where monolithic integration is prioritized over advanced control features and ultra-low IQ. |
Compared with LTC3834EDHC-1#TRPBF, the LTC3834IDHC-1#TRPBF adds industrial temperature qualification; compared with MP2918GL-Z, it trades integrated FETs for superior light-load efficiency, precise tracking, and deterministic phase alignment - critical in multi-rail telecom and automotive systems.
Availability
LTC3834IDHC-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, and telecom RRU applications requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature performance.
Supply support for LTC3834IDHC-1#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3834-1 product line delivers high-efficiency, low-quiescent-current synchronous buck controllers optimized for battery-powered and wide-input industrial systems where reliability, thermal performance, and precise voltage regulation are critical.
FAQ
What is the operating temperature range for the LTC3834IDHC-1#TRPBF?
The LTC3834IDHC-1#TRPBF is specified and guaranteed over –40°C to +85°C ambient temperature. This industrial-grade rating ensures reliable operation in automotive under-hood, factory automation, and outdoor telecom equipment where thermal extremes occur. The DFN package's θJA of 43.5°C/W requires proper PCB copper area and exposed pad soldering to maintain junction temperature below 125°C.
How does the LTC3834IDHC-1#TRPBF achieve 30μA quiescent current?
The LTC3834IDHC-1#TRPBF achieves 30μA no-load IQ through a combination of deep-sleep circuitry, optimized bias networks, and selective shutdown of non-essential blocks during light-load Burst Mode operation. When ITH drops below 0.4V, internal logic disconnects the error amplifier and parks ITH at 0.425V while disabling gate drivers and oscillator - reducing total supply current to 30μA. This is measured at VIN = 12V, VFB = 0.83V, with no load.
Does the LTC3834IDHC-1#TRPBF support output voltage tracking during startup?
Yes, the LTC3834IDHC-1#TRPBF supports precise output voltage tracking via the TRACK/SS pin. When an external resistor divider from a master supply is connected to TRACK/SS, the controller regulates VFB to match that voltage - causing VOUT to rise in lockstep. This avoids sequencing violations in multi-rail systems. An internal 1.1μA current source also enables simple soft-start with a capacitor to SGND.
What are the key differences between LTC3834IDHC-1#TRPBF and LTC3834EGN-1#TRPBF?
The LTC3834IDHC-1#TRPBF uses a 16-pin 5mm × 3mm DFN package with exposed thermal pad (θJA = 43.5°C/W), while the LTC3834EGN-1#TRPBF uses a 16-lead SSOP package (θJA = 90°C/W). Both share identical electrical specifications and temperature grade (–40°C to 85°C), but the DFN offers superior thermal performance and smaller footprint - critical for high-density power modules and portable equipment.
Can the LTC3834IDHC-1#TRPBF be synchronized to an external clock?
Yes, the LTC3834IDHC-1#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When driven with a clean square wave between 140kHz and 650kHz, the internal phase-locked loop aligns the rising edge of TG to the external clock's rising edge. A series RC network on PLLLPF serves as the loop filter. This eliminates beat frequencies and simplifies EMI compliance in multi-converter systems.
LTC3834IDHC-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3834IDHC-1#TRPBF FAQ
1.How can I place an order for LTC3834IDHC-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834IDHC-1#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 LTC3834IDHC-1#TRPBF reliable?
The price and inventory of LTC3834IDHC-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834IDHC-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3834IDHC-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834IDHC-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834IDHC-1#TRPBF?
LTC3834IDHC-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834IDHC-1#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 LTC3834IDHC-1#TRPBF?
For technical support, including LTC3834IDHC-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834IDHC-1#TRPBF requirements.
6.How does Aetrix verify that LTC3834IDHC-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3834IDHC-1#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 LTC3834IDHC-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3834IDHC-1#TRPBF?
All LTC3834IDHC-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834IDHC-1#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 LTC3834IDHC-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3834IDHC-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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