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Analog Devices Inc. LTC3835IDHC-1#PBF
- Part No.:
- LTC3835IDHC-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3835IDHC-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:365
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Product details
Overview
LTC3835IDHC-1#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current synchronous step-down DC/DC controller driving dual N-channel MOSFETs. It operates from 4V to 36V input, delivers adjustable output from 0.8V to 10V with ±1% accuracy, and achieves 99% duty cycle for ultra-low dropout. Used in battery-powered telecom and automotive power systems requiring extended runtime and tight regulation.
For engineers reviewing the LTC3835IDHC-1#PBF datasheet, LTC3835IDHC-1#PBF pinout, LTC3835IDHC-1#PBF application, or LTC3835IDHC-1#PBF equivalent, key selection criteria include its 80μA no-load IQ, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, phase-lockable 140–650kHz switching, and absence of PGOOD/CLKOUT/EXTVCC pins versus the standard LTC3835.
Technical Context
The LTC3835IDHC-1#PBF implements a constant-frequency current-mode architecture with internal 0.8V reference and precision error amplifier. Its ITH pin controls peak inductor current via transconductance gm = 1.55 mmho, enabling stable servo-loop regulation across load and line variations.
It supports three light-load operating modes-Burst Mode® (80μA IQ), pulse-skipping, or forced continuous-selected via the PLLIN/MODE pin. The absence of CLKOUT, EXTVCC, and PGOOD pins distinguishes it from the LTC3835, reducing system complexity at the cost of external synchronization and power-good signaling capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive, telecom, and wide-chemistry battery inputs. |
| No-Load Quiescent Current | 80μA - extends battery life in always-on or standby systems. |
| Output Voltage Accuracy | ±1% over temperature - ensures reliable regulation for sensitive digital loads like FPGAs and processors. |
| Switching Frequency Range | 140kHz to 650kHz, phase-lockable - enables EMI control and optimization of inductor/capacitor size vs. efficiency. |
| Max Duty Cycle | 99.4% - allows operation with VIN as low as VOUT + ~0.2V, critical for high-VIN-to-low-VOUT conversion. |
| Soft-Start Control | Adjustable via TRACK/SS pin with 1μA internal current source - prevents inrush current and enables voltage tracking. |
| Current Sense Threshold | 80–115mV - sets precise overcurrent protection and foldback limiting without external gain stages. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed SGND pad (Pin 17), rated for –40°C to +85°C operation and θJA = 43.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (1) | PLL loop filter node | Connects external RC network to set frequency or enable synchronization; floating = 400kHz, GND = 250kHz, INTVCC = 530kHz. |
| ITH (2) | Error amplifier output / current limit control | Sets peak inductor current; voltage range 0.4V–1.2V defines trip point for current comparator. |
| TRACK/SS (3) | Soft-start and tracking input | Internal 1μA pull-up charges external capacitor for linear ramp; also accepts resistor divider for supply tracking. |
| VFB (4) | Feedback input | Compares divided output voltage to 0.8V reference; ±1% accuracy maintained over temp and line. |
| SGND (5) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback and control loops. |
| PGND (6) | Power ground return | Connects to bottom MOSFET source, Schottky cathode, and CIN negative terminal - carries high di/dt currents. |
| BG (7) | Bottom gate driver output | Drives synchronous N-MOSFET with rail-to-rail swing (0V to INTVCC); fast rise/fall times ≤90ns. |
| INTVCC (8) | Internal LDO output | 5.25V ±5% regulated supply for drivers and logic; requires ≥4.7μF low-ESR capacitor to PGND. |
| VIN (9) | Main input supply | Accepts 4V–36V; powers INTVCC LDO and provides energy to boost circuit; bypass with ceramic capacitor. |
| SW (10) | Switch node | Connects to inductor; swings from ~–0.3V (Schottky drop) to VIN; high dv/dt node requiring tight layout. |
| TG (11) | Top gate driver output | Floating driver output referenced to SW; swing = INTVCC – 0.5V above SW; drives high-side N-MOSFET. |
| BOOST (12) | Bootstrap supply | Connected via capacitor to SW and Schottky diode to INTVCC; supplies TG driver during top-FET conduction. |
| RUN (13) | Enable/shutdown control | Logic-level input; <0.7V disables controller and reduces IQ to 10μA; internal 0.5μA pull-up enables startup. |
| SENSE– (14) | Current sense negative input | Differential input to current comparator; common-mode range 0V to 10V; connects to RSENSE low side. |
| SENSE+ (15) | Current sense positive input | Differential input; connects to RSENSE high side; threshold defined by ITH voltage and RSENSE. |
| PLLIN/MODE (16) | Sync input / light-load mode select | External clock input (140–650kHz) or DC bias: GND = Burst Mode®, INTVCC = continuous, 0.8–INTVCC–0.5V = pulse-skipping. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable transient response across wide range of output capacitance (10μF–1000μF) and ESR (1mΩ–100mΩ), eliminating need for custom compensation networks. |
| Low Dropout Operation | 99.4% max duty cycle allows regulation with VIN as low as VOUT + 0.2V, supporting high-ratio buck conversion in battery-depleted conditions. |
| Three Light-Load Modes | Selectable via single pin: Burst Mode® (80μA IQ), pulse-skipping (low ripple), or forced continuous (lowest noise) - optimizes efficiency vs. EMI/audio performance. |
| Output Overvoltage Protection | Auto-shutdown on VFB > 0.88V (10% above 0.8V ref); activates BG while disabling TG to clamp output and protect downstream loads. |
| Current Foldback Limiting | Reduces MOSFET conduction time during short-circuit, limiting power dissipation and enabling safe hiccup or latch-off behavior. |
Applications
| Automotive Infotainment Power Supply | Telecom Line Card DC/DC Converter |
|---|---|
Use Scenario: Powers FPGA, DSP, and memory in head-unit systems with 12V battery input subject to cold-crank (4.5V) and load-dump (36V) transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3.3V/5V rails; handles wide VIN range and maintains regulation during deep discharge. Use Value: 80μA quiescent current preserves battery charge during vehicle sleep mode; 99.4% duty cycle sustains output during cranking events down to 5.5V VIN. | Use Scenario: Generates isolated 3.3V/5V rails from –48V telecom supply using intermediate 12V bus. IC Role / Device Role / Timing Role: High-efficiency step-down controller driving discrete N-MOSFETs in non-isolated intermediate bus converter (IBC). Use Value: Phase-lockable 400–650kHz operation enables synchronized switching across multiple converters to suppress beat frequencies and simplify EMI filtering. |
| Industrial IoT Sensor Node | Portable Medical Diagnostic Device |
Use Scenario: Powers ultra-low-power microcontroller, BLE radio, and analog front-end from two-cell Li-ion (6–8.4V) with multi-year battery life requirement. IC Role / Device Role / Timing Role: Main system power controller operating in Burst Mode® during sensor sleep cycles; transitions to pulse-skipping during data transmission bursts. Use Value: 80μA no-load IQ directly extends battery runtime; soft-start via TRACK/SS prevents inrush into large capacitive loads like RF modules. | Use Scenario: Supplies imaging sensor array and ADC in handheld ultrasound device powered by removable Li-poly battery (3.0–4.2V). IC Role / Device Role / Timing Role: Precision buck controller delivering 1.8V/3.3V with ±1% accuracy and low noise for analog signal chain integrity. Use Value: OPTI-LOOP® compensation ensures stable regulation despite aging and temperature drift of polymer tantalum output capacitors used for space-constrained layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3835EDHC-1#PBF | Same pinout and electrical specs, but rated for 0°C to 85°C (E-grade) instead of –40°C to 85°C (I-grade). | Not suitable for automotive or industrial environments requiring full extended temperature operation. | Select only if ambient operating temperature remains above 0°C; otherwise LTC3835IDHC-1#PBF is required. |
| MP2491DJ-LF-P | Monolithic 2A buck regulator (integrated MOSFETs), fixed 3.3V/5V options, no PLL sync, higher IQ (120μA), smaller 8-pin SOIC package. | Lacks programmability, external MOSFET drive, and wide VOUT adjustability; limited to lower current and simpler designs. | Choose for cost-sensitive, low-complexity, sub-2A applications where board space is constrained and design flexibility is secondary. |
Compared with LTC3835EDHC-1#PBF, the LTC3835IDHC-1#PBF guarantees full –40°C to 85°C performance, making it suitable for automotive under-hood and industrial edge deployments; versus MP2491DJ-LF-P, it offers superior thermal management via discrete MOSFETs, wider VIN/VOUT range, and advanced light-load efficiency modes - essential for high-reliability, high-flexibility power systems.
Availability
LTC3835IDHC-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment, telecom line card power, and portable medical device applications requiring stable component supply, extended temperature support, and long-term lifecycle continuity.
Supply support for LTC3835IDHC-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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3835-1 belongs to ADI's high-efficiency DC/DC controller product line, designed specifically for demanding industrial, automotive, and telecom applications where low IQ, wide input range, and robust transient response are critical.
FAQ
What is the maximum input voltage rating for the LTC3835IDHC-1#PBF?
The LTC3835IDHC-1#PBF has an absolute maximum input voltage (VIN) rating of 36V. Operation is specified from 4V to 36V, covering 12V and 24V automotive, telecom, and industrial battery systems. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3835IDHC-1#PBF support output voltage tracking during startup?
Yes, the LTC3835IDHC-1#PBF supports output voltage tracking via the TRACK/SS pin. Connecting an external resistor divider from a master supply to the TRACK/SS pin causes the LTC3835IDHC-1#PBF output to ramp in proportion to that supply, ensuring controlled sequencing in multi-rail systems.
How does the LTC3835IDHC-1#PBF differ from the standard LTC3835 in terms of feature set?
The LTC3835IDHC-1#PBF omits CLKOUT, EXTVCC, and PGOOD pins present on the LTC3835. This reduces pin count and simplifies layout but removes external clock output, auxiliary supply capability, and power-good signaling - trade-offs accepted for cost- and space-constrained applications where those functions are unnecessary.
What is the minimum on-time specification for the LTC3835IDHC-1#PBF, and why does it matter?
The LTC3835IDHC-1#PBF has a minimum on-time (tON(MIN)) of 180ns. This limits the lowest achievable output voltage at high input voltages (e.g., VIN = 36V → VOUT ≥ ~0.8V at 400kHz). It constrains design choices for very low-VOUT, high-input-ratio applications and must be verified against inductor ripple requirements.
Can the LTC3835IDHC-1#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3835IDHC-1#PBF supports external synchronization via the PLLIN/MODE pin. Its phase-locked loop guarantees lock from 140kHz to 650kHz, with typical operation up to 800kHz. An external R-C filter on the PLLLPF pin is required to configure the loop bandwidth for stable synchronization.
LTC3835IDHC-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)
LTC3835IDHC-1#PBF FAQ
1.How can I place an order for LTC3835IDHC-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835IDHC-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 LTC3835IDHC-1#PBF reliable?
The price and inventory of LTC3835IDHC-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 LTC3835IDHC-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3835IDHC-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835IDHC-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835IDHC-1#PBF?
LTC3835IDHC-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835IDHC-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 LTC3835IDHC-1#PBF?
For technical support, including LTC3835IDHC-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835IDHC-1#PBF requirements.
6.How does Aetrix verify that LTC3835IDHC-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3835IDHC-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 LTC3835IDHC-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3835IDHC-1#PBF?
All LTC3835IDHC-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835IDHC-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 LTC3835IDHC-1#PBF part is unused and in its original packaging.
Return procedure for LTC3835IDHC-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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