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Analog Devices Inc. LTC3834EDHC-1#TRPBF
- Part No.:
- LTC3834EDHC-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3834EDHC-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,752
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Product details
Overview
LTC3834EDHC-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 a 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 compact, battery-life-optimized DC/DC conversion in automotive infotainment power rails.
For engineers reviewing the LTC3834EDHC-1#TRPBF datasheet, LTC3834EDHC-1#TRPBF pinout, LTC3834EDHC-1#TRPBF application, or LTC3834EDHC-1#TRPBF equivalent, this page provides verified package mapping (16-lead 5mm × 3mm DFN), validated pin functions, confirmed light-load operation modes (Burst Mode®, pulse-skipping, continuous), exact overvoltage protection threshold (10% above 0.8V), and real-world thermal resistance (θJA = 43.5°C/W).
Technical Context
The LTC3834EDHC-1#TRPBF implements a constant-frequency current-mode control architecture with OPTI-LOOP® compensation, enabling stable transient response across wide output capacitance and ESR ranges. Its error amplifier drives the ITH pin to regulate peak inductor current, while independent SENSE+ and SENSE− inputs support accurate differential current sensing.
It integrates a 5.25V internal LDO (INTVCC) powered from VIN, dual high-current gate drivers (TG/BG) with 70ns dead-time control, and a phase-locked loop (PLL) with guaranteed 140kHz–650kHz synchronization range. The RUN pin enables digital shutdown (4μA IQ), and TRACK/SS supports both soft-start ramping (1.1μA internal pull-up) and supply tracking via external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and industrial DC bus inputs without pre-regulation. |
| Output Voltage Range | 0.8V to 10V - programmable via external resistor divider; precision 0.8V reference enables tight regulation at low VOUT. |
| No-Load Quiescent Current | 30μA - extends runtime in always-on battery systems such as telematics or remote sensors. |
| Switching Frequency Range | 140kHz to 650kHz - selectable via PLLLPF pin or external clock; higher frequencies reduce inductor size, lower frequencies improve efficiency. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable core logic or ADC reference supply under thermal stress. |
| Max Duty Cycle | 99.4% - enables ultra-low dropout operation (e.g., 5V→4.95V at high load), critical for post-regulator applications. |
| Current Sense Threshold | 85mV to 115mV - sets peak inductor current limit; supports RSENSE ≥ 0.8mΩ for ≥10A designs. |
| Thermal Resistance θJA | 43.5°C/W - measured for DFN package with exposed pad soldered to PCB; enables accurate junction temperature estimation. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed pad (Pin 17) connected to SGND. Requires soldering of exposed pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (Pin 1) | PLL low-pass filter node | Connects external RC network when synchronizing to external clock; floating/INTVCC/SGND selects 400kHz/530kHz/250kHz nominal frequency. |
| ITH (Pin 2) | Error amplifier output & compensation point | Controls peak inductor current; voltage range 0.425V–1.2V defines operating mode (sleep vs active) and current limit. |
| TRACK/SS (Pin 3) | Soft-start and tracking input | Internal 1.1μA pull-up charges external capacitor for linear VOUT ramp; accepts external voltage for supply tracking. |
| VFB (Pin 4) | Feedback input | Compares divided output voltage against 0.8V reference; ±1% accuracy maintained over full temperature range. |
| SGND (Pin 5) | Small-signal ground | Must be routed separately from PGND to avoid noise coupling into feedback and error amplifier paths. |
| PGND (Pin 6) | Power ground | Return path for bottom MOSFET source, Schottky cathode, and input capacitor - ties to high-current return plane. |
| BG (Pin 7) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing from 0V to INTVCC (5.25V); 40–90ns rise/fall times. |
| INTVCC (Pin 8) | Internal LDO output | 5.25V ±5% regulated supply for drivers and logic; requires ≥4.7μF ceramic/tantalum decoupling to PGND. |
| VIN (Pin 9) | Main input supply | Accepts 4V–36V; powers INTVCC LDO and supplies BOOST capacitor charging path; absolute max = 36V. |
| SW (Pin 10) | Switch node | Connects to inductor and BOOST capacitor; voltage swings from –0.3V (Schottky drop) to VIN; high di/dt node. |
| TG (Pin 11) | Top gate driver output | Floating driver output referenced to SW; swing = INTVCC – 0.5V above SW; 50–90ns rise/fall times. |
| BOOST (Pin 12) | Bootstrap supply | Connected to SW via capacitor and to INTVCC via Schottky; supplies floating bias for TG driver during high-side conduction. |
| RUN (Pin 13) | Enable/shutdown control | Logic-compatible input; <0.7V disables controller (4μA IQ); internal 0.5μA pull-up enables auto-start on release. |
| SENSE– (Pin 14) | Current sense negative input | Differential input to current comparator; common-mode range = SGND to 10V; supports high-side or low-side sensing. |
| SENSE+ (Pin 15) | Current sense positive input | Paired with SENSE–; offset and ITH voltage set trip threshold; total input bias current ≤ –220μA. |
| PLLIN/MODE (Pin 16) | External sync input / light-load mode select | Accepts external clock (140–650kHz) for PLL lock; DC voltage selects Burst Mode (<0.8V), pulse-skipping (0.8–INTVCC–0.5V), or forced continuous (INTVCC). |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across 10μF–1000μF output capacitors and 5mΩ–100mΩ ESR - eliminates need for custom compensation per design. |
| 99.4% Maximum Duty Cycle | Supports <0.1V dropout (e.g., 5V→4.92V @ 5A) without external components - ideal for post-regulator applications in distributed power systems. |
| Three Light-Load Operating Modes | Selectable via single pin (PLLIN/MODE): Burst Mode® (30μA IQ), pulse-skipping (low ripple + moderate efficiency), or forced continuous (lowest noise, highest ripple). |
| Output Overvoltage Protection | Hardware-based OVLO triggers at VFB > 0.88V (10% above 0.8V), immediately disabling TG and enabling BG - protects downstream ICs without software delay. |
| Phase-Lockable Oscillator | Guaranteed lock range 140kHz–650kHz; eliminates beat frequencies in multi-rail systems and enables synchronized EMI reduction. |
| Integrated 5.25V LDO (INTVCC) | Self-powered from VIN; delivers 50mA peak current; eliminates need for external bias supply - simplifies BOM and layout. |
Applications
| Automotive Infotainment Power | Industrial 24V DC-DC Conversion |
|---|---|
|
Use Scenario: Powering DSP, FPGA, and display controllers in head units with 12V/24V battery input and strict 30μA standby requirement. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3.3V/5V rails; manages soft-start sequencing and tracks auxiliary supplies during cold-crank. Use Value: 30μA quiescent current meets ISO 16750-2 sleep mode requirements; 99.4% duty cycle sustains operation during 6V brownout events. |
Use Scenario: Converting unregulated 24V factory bus to isolated 5V/12V logic supplies in PLC backplanes and I/O modules. IC Role / Device Role / Timing Role: High-reliability step-down controller with integrated gate drivers; supports phase synchronization across multiple rails to suppress conducted EMI. Use Value: 4V–36V input range accommodates 24V ±25% tolerance; ±1% output accuracy ensures sensor ADC reference stability over temperature. |
| Telecom Remote Radio Unit (RRU) | Portable Medical Diagnostic Equipment |
|
Use Scenario: Generating bias voltages for RF power amplifiers and analog front-ends in outdoor base station RRUs with limited thermal mass. IC Role / Device Role / Timing Role: Efficient 48V-to-5V/3.3V converter using external N-MOSFETs; employs Burst Mode® to minimize self-heating during low-traffic periods. Use Value: 43.5°C/W θJA enables operation up to 85°C ambient without derating; OPTI-LOOP® maintains stability with polymer capacitors used for low ESR. |
Use Scenario: Battery-powered ultrasound or ECG devices requiring quiet, long-life power for analog signal chains and microcontrollers. IC Role / Device Role / Timing Role: Low-noise synchronous controller supporting forced continuous mode to eliminate audible switching artifacts in analog sections. Use Value: Selectable light-load modes allow trade-off between efficiency (Burst Mode®) and noise (continuous); TRACK/SS enables coordinated startup with MCU reset timing. |
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 | Integrated power stage (2.2A), 3.4V–42V input, 2.5μA IQ, Silent Switcher® architecture | Better EMI performance and smaller solution size; lacks PLL sync and adjustable current limit | Choose LT8640S for space-constrained, noise-sensitive applications where integrated FETs suffice and external sync is unnecessary. |
| MP2918 | 3.5V–36V input, 50μA IQ, 1.2V reference, no PLL sync, DFN-14 package | Lower cost; missing OPTI-LOOP®, fixed 1.2V ref limits low-VOUT flexibility; no TRACK/SS pin | Choose MP2918 for cost-driven industrial supplies where 0.8V reference and soft-start tracking are not required. |
Compared with LT8640S and MP2918, the LTC3834EDHC-1#TRPBF uniquely combines ultra-low 30μA quiescent current, 0.8V precision reference, hardware OVLO, and PLL synchronization - making it optimal for high-reliability, thermally constrained, multi-rail systems requiring deterministic timing control.
Availability
LTC3834EDHC-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment power, industrial 24V DC-DC conversion, and telecom remote radio unit (RRU) applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3834EDHC-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 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3834-1 belongs to Linear's high-efficiency synchronous controller family, designed specifically for demanding industrial, automotive, and telecom applications where low IQ, wide input range, and precise output regulation are critical.
FAQ
What is the absolute maximum input voltage rating for the LTC3834EDHC-1#TRPBF?
The absolute maximum input voltage (VIN) for the LTC3834EDHC-1#TRPBF is 36V. Exceeding this voltage - even momentarily - risks permanent damage. The device operates over a functional range of 4V to 36V, and the internal INTVCC LDO derives power directly from VIN, making overvoltage protection at the input stage essential before the LTC3834EDHC-1#TRPBF.
Does the LTC3834EDHC-1#TRPBF support output voltage tracking during startup?
Yes, the LTC3834EDHC-1#TRPBF supports output voltage tracking via the TRACK/SS pin. When an external resistor divider from another supply is connected to TRACK/SS, the LTC3834EDHC-1#TRPBF regulates its VFB to match that voltage during startup - ensuring controlled power sequencing. This function is distinct from soft-start and does not require additional circuitry beyond the divider.
How does the LTC3834EDHC-1#TRPBF implement overvoltage protection?
The LTC3834EDHC-1#TRPBF implements hardware-based overvoltage protection by monitoring the VFB pin. If VFB exceeds 0.88V (10% above the 0.8V reference), the top gate driver (TG) is immediately disabled and the bottom gate driver (BG) is enabled to clamp the output. This action occurs autonomously without software intervention and is specified across the full –40°C to 85°C temperature range.
Can the LTC3834EDHC-1#TRPBF synchronize to an external clock, and what is the guaranteed lock range?
Yes, the LTC3834EDHC-1#TRPBF can synchronize to an external clock applied to the PLLIN/MODE pin. Its phase-locked loop guarantees lock across 140kHz to 650kHz - a range validated in production testing. Outside this band, synchronization is not assured, and the device reverts to free-running mode determined by the PLLLPF pin configuration.
What thermal resistance (θJA) applies to the LTC3834EDHC-1#TRPBF in its DFN package?
The LTC3834EDHC-1#TRPBF in the 16-lead 5mm × 3mm DFN package (DHC) has a specified junction-to-ambient thermal resistance (θJA) of 43.5°C/W. This value assumes the exposed pad (Pin 17) is properly soldered to a minimum 1-inch² copper area on the PCB - a requirement explicitly stated in the datasheet for thermal and electrical performance.
LTC3834EDHC-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)
LTC3834EDHC-1#TRPBF FAQ
1.How can I place an order for LTC3834EDHC-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834EDHC-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 LTC3834EDHC-1#TRPBF reliable?
The price and inventory of LTC3834EDHC-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 LTC3834EDHC-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3834EDHC-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834EDHC-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834EDHC-1#TRPBF?
LTC3834EDHC-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834EDHC-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 LTC3834EDHC-1#TRPBF?
For technical support, including LTC3834EDHC-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834EDHC-1#TRPBF requirements.
6.How does Aetrix verify that LTC3834EDHC-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3834EDHC-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 LTC3834EDHC-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3834EDHC-1#TRPBF?
All LTC3834EDHC-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834EDHC-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 LTC3834EDHC-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3834EDHC-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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