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Analog Devices Inc. LTC3834IDHC-1#PBF
- Part No.:
- LTC3834IDHC-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3834IDHC-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,501
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Product details
Overview
LTC3834IDHC-1#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 to 10V output from 4V–36V input, achieves ±1% output voltage 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 LTC3834IDHC-1#PBF datasheet, LTC3834IDHC-1#PBF pinout, LTC3834IDHC-1#PBF application, or LTC3834IDHC-1#PBF equivalent, key selection criteria include its 30μA IQ in Burst Mode, OPTI-LOOP® compensation for wide COUT/ESR flexibility, 99% duty cycle dropout capability, adjustable soft-start/tracking, and absence of CLKOUT, EXTVCC, and PGOOD pins versus the LTC3834 variant.
Technical Context
The LTC3834IDHC-1#PBF implements a constant-frequency current-mode control architecture with an internal 0.8V precision reference and transconductance error amplifier. Its ITH pin controls peak inductor current via voltage-programmed current limit, while the TRACK/SS pin enables either soft-start ramping (via internal 1.1μA pull-up) or supply tracking via external divider.
It features three selectable light-load operating modes - Burst Mode® (30μA IQ), pulse-skipping, or forced continuous - configured via the PLLIN/MODE pin. The phase-locked loop accepts external clocks from 140kHz to 650kHz (guaranteed range), with PLLLPF pin setting nominal frequency at 250kHz (GND), 400kHz (floating), or 530kHz (INTVCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and wide-input industrial supplies. |
| Output Voltage Range | 0.8V to 10V - programmable via external resistor divider; regulated to ±1% over line/load/temp. |
| No-Load Quiescent Current | 30μA - extends runtime in always-on battery systems such as telematics or ECU standby rails. |
| Switching Frequency Range | 140kHz to 650kHz - phase-lockable to external clock; nominal 400kHz when PLLLPF floating. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation (e.g., 5V→4.95V at high load) without external bias. |
| Current Sense Threshold | 85mV to 115mV - sets peak inductor current; supports RSENSE-based overcurrent foldback protection. |
| Shutdown IQ | 4μA - minimizes system leakage during deep sleep or fault shutdown. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed SGND pad (Pin 17), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (Pin 1) | PLL low-pass filter node | Configures nominal frequency (250/400/530kHz) or filters external sync signal; must be RC-filtered when synchronizing. |
| ITH (Pin 2) | Error amplifier output / current limit control | Sets peak inductor current; voltage range 0.4V–1.2V defines current limit threshold and transient response. |
| TRACK/SS (Pin 3) | Soft-start and tracking input | Internal 1.1μA pull-up enables linear VOUT ramp; external divider allows output to track another rail during startup. |
| VFB (Pin 4) | Feedback voltage sense | Compares divided VOUT to 0.8V reference; ±1% accuracy ensures tight regulation across temperature. |
| SGND (Pin 5) | Small-signal ground | Reference for VFB, ITH, TRACK/SS; must be isolated from PGND to avoid noise coupling into control loop. |
| PGND (Pin 6) | Power ground return | Return path for bottom MOSFET source, Schottky cathode, and input capacitor negative terminal. |
| BG (Pin 7) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing = 0V to INTVCC (5.25V). |
| INTVCC (Pin 8) | Internal LDO output | 5.25V ±1% regulated supply for logic and drivers; requires ≥4.7μF ceramic/tantalum bypass to PGND. |
| VIN (Pin 9) | Main input supply | Accepts 4V–36V; powers INTVCC LDO and provides bootstrap recharge path; bypass capacitor mandatory. |
| SW (Pin 10) | Switch node | Connects to inductor; voltage swings from ~–0.3V (Schottky drop) to VIN; critical for layout and EMI control. |
| TG (Pin 11) | Top gate driver output | Floating driver output referenced to SW; swing = SW to (SW + INTVCC − 0.5V); drives high-side N-MOSFET gate. |
| BOOST (Pin 12) | Bootstrap supply | Charged via external diode/capacitor from INTVCC; supplies TG driver; voltage = INTVCC to (VIN + INTVCC). |
| RUN (Pin 13) | Enable/shutdown control | Logic-level input; <0.7V disables controller and reduces IQ to 4μA; internal pull-up enables automatic start-up. |
| SENSE– (Pin 14) | Current sense negative input | Differential input to current comparator; connects to low-side of RSENSE; common-mode range = SGND to 10V. |
| SENSE+ (Pin 15) | Current sense positive input | Differential input to current comparator; connects to high-side of RSENSE; used with SENSE– to detect IL peak. |
| PLLIN/MODE (Pin 16) | Sync input / light-load mode select | Accepts external clock (140–650kHz) or selects Burst Mode (GND), pulse-skip (0.9–INTVCC−0.5V), or forced continuous (INTVCC). |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide output capacitance (10μF–1000μF) and ESR (1mΩ–100mΩ) without external compensation components. |
| 99.4% Maximum Duty Cycle | Supports <0.1V dropout (e.g., 5V→4.95V) without external VBST bias, simplifying high-VIN-to-high-VOUT designs. |
| Adjustable Light-Load Operation | Three user-selectable modes - Burst Mode® (30μA IQ), pulse-skipping (low ripple), or forced continuous (lowest noise) - via single PLLIN/MODE pin. |
| Output Overvoltage Protection | Shuts off top MOSFET and turns on bottom MOSFET if VFB exceeds 10% above 0.8V, protecting downstream loads from transient overshoot. |
| Integrated 5.25V LDO | Derives INTVCC from VIN with ±1% regulation and 1% load regulation (0–20mA), eliminating need for external bias supply. |
Applications
| Automotive Infotainment Power | Industrial Distributed DC Supply |
|---|---|
Use Scenario: Powering DSPs, FPGAs, and display controllers in head units with cold-crank tolerance (4V min) and low-quiescent standby. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3.3V/5V rails from 12V battery; manages soft-start sequencing and load transient response. Use Value: 30μA IQ extends battery life during vehicle-off state; 99.4% duty cycle maintains output during cranking dips to 6V. | Use Scenario: Generating isolated 5V/12V intermediate rails in programmable logic controllers with wide input (18–36V DC). IC Role / Device Role / Timing Role: High-efficiency step-down controller driving discrete N-MOSFETs; synchronized to system clock to reduce EMI in dense PCB layouts. Use Value: Phase-lockable 140–650kHz operation enables deterministic noise spectrum; ±1% VOUT accuracy ensures reliable ADC reference stability. |
| Telecom Line Card Bias | Battery-Operated Test Equipment |
Use Scenario: Providing clean, adjustable 3.3V/5V bias for SERDES and PHY ICs in modular telecom line cards with hot-swap capability. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with precise current limiting and output tracking for multi-rail sequencing. Use Value: Adjustable soft-start via TRACK/SS prevents inrush into large backplane capacitance; foldback current limiting protects MOSFETs during short-circuit faults. | Use Scenario: Powering portable oscilloscopes and multimeters requiring >100-hour battery life and stable analog front-end rails. IC Role / Device Role / Timing Role: Low-IQ synchronous controller regulating 3.3V from Li-ion (3.0–4.2V) or 2-cell alkaline (2.0–3.2V) inputs. Use Value: 30μA Burst Mode IQ enables multi-day operation; 0.8V reference and OPTI-LOOP allow use of low-ESR polymer capacitors for compact size. |
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#PBF | Same functionality and pinout, but specified only for 0°C to 85°C ambient; lower temperature grade. | Suitable for commercial-grade applications where extended –40°C operation is not required. | Select LTC3834EDHC-1#PBF only if full industrial temperature range is unnecessary and cost optimization is prioritized. |
| MP2315DJ-LF-Z | Integrated MOSFETs (vs. external), fixed 500kHz frequency, higher 45μA IQ, no PLL or TRACK/SS. | Targeted at space-constrained, cost-sensitive designs where external FETs and advanced sequencing are not needed. | Choose MP2315DJ-LF-Z for simpler BOM and smaller footprint; retain LTC3834IDHC-1#PBF when design requires external FETs, wide frequency tuning, or soft-start/tracking. |
Compared with LTC3834EDHC-1#PBF, the LTC3834IDHC-1#PBF guarantees –40°C to +85°C operation and tighter parametric limits; compared with MP2315DJ-LF-Z, it offers superior thermal management via external FETs, flexible frequency synchronization, and precision soft-start control - critical for high-reliability industrial and automotive systems.
Availability
LTC3834IDHC-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment power, industrial distributed DC supply, and battery-operated test equipment requiring stable component supply and guaranteed industrial temperature performance.
Supply support for LTC3834IDHC-1#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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3834-1 product line delivers high-efficiency, low-IQ synchronous step-down controllers optimized for battery-powered and wide-input industrial systems demanding precision regulation, robust fault protection, and flexible light-load operation.
FAQ
What is the guaranteed operating temperature range for the LTC3834IDHC-1#PBF?
The LTC3834IDHC-1#PBF is fully specified and guaranteed over the industrial temperature range of –40°C to +85°C. This is confirmed by characterization, statistical process control, and testing per Note 2 in the official datasheet. Unlike the 'E' grade (0°C to 85°C), the 'I' grade ensures performance compliance across the full –40°C to +85°C ambient range.
Does the LTC3834IDHC-1#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3834IDHC-1#PBF supports output voltage tracking via the TRACK/SS pin (Pin 3). When an external resistor divider from a master supply is connected to this pin, the controller regulates VFB to match the TRACK/SS voltage during startup - causing the LTC3834IDHC-1#PBF's output to ramp in parallel with the master rail. An internal 1.1μA pull-up current enables standalone soft-start when a capacitor is tied to SGND.
How does the LTC3834IDHC-1#PBF achieve 30μA quiescent current, and under what conditions?
The LTC3834IDHC-1#PBF achieves 30μA quiescent current specifically in Burst Mode® operation at light loads, as measured with RUN = 5V and VFB = 0.83V (no load). This ultra-low IQ is enabled when the PLLIN/MODE pin is pulled to SGND, triggering sleep mode where internal circuitry is gated and the ITH pin is parked at 0.425V - extending battery life in always-on systems without compromising startup behavior.
What are the key differences between the LTC3834IDHC-1#PBF and the standard LTC3834 part?
The LTC3834IDHC-1#PBF omits CLKOUT, EXTVCC, and PGOOD pins present on the LTC3834, resulting in a 16-pin DFN (vs. 20-pin QFN) and simplified peripheral support. It retains identical core control functionality - same 30μA IQ, OPTI-LOOP®, frequency range, and protection features - but targets cost- and space-sensitive applications where those three signals are not required.
Can the LTC3834IDHC-1#PBF synchronize to an external clock, and what is the guaranteed lock range?
Yes, the LTC3834IDHC-1#PBF can synchronize to an external clock applied to the PLLIN/MODE pin (Pin 16). Its phase-locked loop guarantees lock to frequencies between 140kHz and 650kHz, with typical capture up to 800kHz. An external RC filter must be connected to the PLLLPF pin (Pin 1) to stabilize the loop; the internal oscillator remains disabled during synchronization.
LTC3834IDHC-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3834IDHC-1#PBF FAQ
1.How can I place an order for LTC3834IDHC-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834IDHC-1#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 LTC3834IDHC-1#PBF reliable?
The price and inventory of LTC3834IDHC-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3834IDHC-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834IDHC-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834IDHC-1#PBF?
LTC3834IDHC-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834IDHC-1#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 LTC3834IDHC-1#PBF?
For technical support, including LTC3834IDHC-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834IDHC-1#PBF requirements.
6.How does Aetrix verify that LTC3834IDHC-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3834IDHC-1#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 LTC3834IDHC-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3834IDHC-1#PBF?
All LTC3834IDHC-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834IDHC-1#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 LTC3834IDHC-1#PBF part is unused and in its original packaging.
Return procedure for LTC3834IDHC-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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