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Analog Devices Inc. LTC3835EDHC-1#TRPBF
- Part No.:
- LTC3835EDHC-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3835EDHC-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,808
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Product details
Overview
LTC3835EDHC-1#TRPBF 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 0.8V–10V output with ±1% accuracy, supports phase-lockable 140kHz–650kHz switching, and achieves 99% duty cycle for ultra-low dropout-ideal for battery-powered telecom and automotive power systems.
For engineers reviewing the LTC3835EDHC-1#TRPBF datasheet, LTC3835EDHC-1#TRPBF pinout, LTC3835EDHC-1#TRPBF application, or LTC3835EDHC-1#TRPBF equivalent, key selection criteria include its 80μA no-load IQ, OPTI-LOOP® compensation for wide COUT/ESR tolerance, selectable light-load modes (Burst Mode®, pulse-skipping, continuous), and absence of CLKOUT, EXTVCC, and PGOOD pins versus the standard LTC3835.
Technical Context
The LTC3835EDHC-1#TRPBF implements a constant-frequency current-mode control architecture with internal 0.8V reference and transconductance error amplifier (gm = 1.55 mmho). Its ITH pin directly controls peak inductor current via voltage-programmed current comparator with 80–115mV threshold range.
It features dedicated synchronous gate drivers (TG/BG) with 40–90ns transition times, integrated INTVCC LDO (5.25V ±5%), and precision RUN pin shutdown (0.7V threshold) reducing IQ to 10μA. The PLLIN/MODE pin serves dual function: external clock synchronization input or light-load mode selector (Burst Mode® when <0.7V, pulse-skipping at 0.9–INTVCC−0.5V, forced continuous at INTVCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive, 48V telecom-derived rails, and multi-cell Li-ion batteries. |
| No-Load Quiescent Current | 80μA - extends runtime in always-on battery systems such as IoT sensors and telematics modules. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures stable core voltage for FPGAs, DSPs, and microprocessors without post-regulation. |
| Switching Frequency Range | 140kHz to 650kHz (phase-lockable) - enables optimization between EMI filtering size and MOSFET conduction vs. switching loss trade-offs. |
| Duty Cycle Max | 99.4% - sustains regulation down to VIN − VOUT ≈ 0.3V, critical for high-current low-VOUT applications like 3.3V/5V point-of-load converters. |
| Current Sense Threshold | 80mV to 115mV - sets precise overcurrent foldback limit with minimal RSENSE power loss (e.g., 8mΩ yields 10A max). |
| Operating Temperature | –40°C to +85°C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed SGND pad (Pin 17), θJA = 43.5°C/W, RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (1) | PLL loop filter node | Connects external RC network to set PLL bandwidth; floating = 400kHz, GND = 250kHz, INTVCC = 530kHz. |
| ITH (2) | Error amplifier output | Directly programs peak inductor current; voltage range 0.425V–1.2V defines current limit and transient response. |
| TRACK/SS (3) | Soft-start/tracking control | Internal 1μA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider for supply tracking. |
| VFB (4) | Feedback input | Compares divided output voltage against 0.8V reference; ±1% accuracy maintained across temperature. |
| SGND (5) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback and error amplifier paths. |
| PGND (6) | Power ground return | Common node for bottom MOSFET source, Schottky cathode, and input capacitor negative terminal. |
| BG (7) | Bottom gate driver output | Drives synchronous N-MOSFET gate from 0V to INTVCC (5.25V); 40–90ns rise/fall time minimizes shoot-through risk. |
| INTVCC (8) | Internal LDO output | 5.25V ±5% regulated supply powers drivers and logic; requires ≥4.7μF low-ESR capacitor to PGND. |
| VIN (9) | Main input supply | Bypassed to SGND with ceramic capacitor; supports up to 36V with absolute max rating of 36V. |
| SW (10) | Switch node | Connects to inductor; swings from ~–0.3V (Schottky drop) to VIN; high di/dt node requiring tight layout. |
| TG (11) | Top gate driver output | Floating driver referenced to SW; swing = INTVCC – 0.5V above SW; requires bootstrap capacitor (BOOST–SW). |
| BOOST (12) | Bootstrap supply | Charged via external Schottky from INTVCC during BG on-time; supplies TG driver during high-side conduction. |
| RUN (13) | Enable/shutdown control | Pull <0.7V to disable controller and reduce IQ to 10μA; internal 0.5μA pull-up enables automatic start-up. |
| SENSE– (14) | Current sense negative | Low-side current sensing input; common-mode range 0V to 10V; used with SENSE+ for differential ΔV measurement. |
| SENSE+ (15) | Current sense positive | High-side current sensing input; paired with SENSE– to detect inductor current via RSENSE voltage drop. |
| PLLIN/MODE (16) | Synchronization / mode select | Accepts external clock (140–650kHz) for phase-locking; DC bias selects Burst Mode® (<0.7V), pulse-skipping (0.9–INTVCC−0.5V), or continuous (INTVCC). |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable operation with wide range of output capacitors (including high-ESR electrolytics) and eliminates need for complex type-II/type-III compensation networks. |
| Ultra-Low Dropout Operation | 99.4% maximum duty cycle allows regulation with <0.5V input-to-output differential, enabling direct 3.3V conversion from single Li-ion cell (3.0V min). |
| Selectably Optimized Light-Load Efficiency | Three distinct operating modes - Burst Mode® (80μA IQ), pulse-skipping (low ripple), or forced continuous (lowest noise) - adapt to dynamic load profiles without hardware change. |
| Robust Overvoltage Protection | Hardware-based OVP triggers at VFB > 10% above 0.8V (i.e., >0.88V), immediately disabling TG and enabling BG to clamp output - protects downstream ICs during startup or fault conditions. |
| Integrated INTVCC LDO | 5.25V ±5% internal regulator powers gate drivers and analog circuitry; eliminates need for external bias supply while maintaining performance across full VIN range. |
Applications
| Telecom Power Supply | Automotive Infotainment |
|---|---|
Use Scenario: Generating 3.3V/5V rails from 48V intermediate bus in base station power shelves. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating POL voltage with phase-lock capability to system clock for EMI reduction. Use Value: 4V–36V input range accommodates 48V-derived 12V rail; 80μA IQ reduces standby power; 140–650kHz sync range aligns switching harmonics with system timing. | Use Scenario: Powering display backlight drivers and audio amplifiers in vehicle head units with cold-crank immunity. IC Role / Device Role / Timing Role: High-efficiency step-down controller delivering stable 5V from 9–16V battery with dropout recovery below 6V. Use Value: 99.4% duty cycle maintains regulation during 6V cold-crank; ±1% VOUT accuracy prevents display flicker or audio distortion; -40°C to 85°C rating ensures reliability. |
| Industrial IoT Sensor Node | Portable Medical Device |
Use Scenario: Long-life battery-powered environmental sensor with intermittent RF transmission bursts. IC Role / Device Role / Timing Role: Low-IQ buck controller supplying 3.3V to MCU and radio, entering Burst Mode® between transmissions. Use Value: 80μA no-load IQ extends 2xAA battery life to >5 years; TRACK/SS pin enables synchronized soft-start with MCU wake-up signal. | Use Scenario: Compact handheld diagnostic tool requiring quiet, precise 1.8V/3.3V rails for ADCs and wireless SoCs. IC Role / Device Role / Timing Role: Low-noise synchronous controller operating in pulse-skipping mode to minimize RF interference near sensitive analog front-ends. Use Value: Pulse-skipping mode provides lower ripple than Burst Mode® while maintaining >85% efficiency at 10mA load; small 5mm×3mm DFN saves PCB area. |
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 |
|---|---|---|---|
| LTC3833EDHD#TRPBF | Wider VIN range (2.75V–38V), includes PGOOD and CLKOUT, higher IQ (100μA), same DFN package. | Supports lower-input applications (e.g., single-cell Li-ion), adds power-good signaling for sequencing. | Choose when PGOOD output or sub-4V operation is required; not drop-in due to pinout differences and added functions. |
| MP2918GL-Z | Monolithic 30V synchronous buck (integrated MOSFETs), 100μA IQ, fixed 500kHz frequency, no PLL or TRACK/SS. | Reduces BOM count and layout complexity but lacks programmability and ultra-low IQ. | Choose for cost-sensitive, space-constrained designs where 30V max VIN and fixed frequency suffice; not pin-compatible or functionally equivalent. |
Compared with LTC3835EDHC-1#TRPBF, the LTC3833EDHD#TRPBF adds system-level features at higher quiescent current and different pin mapping, while the MP2918GL-Z trades design flexibility for integration-making the LTC3835EDHC-1#TRPBF optimal for high-efficiency, programmable, high-voltage POL controllers where external MOSFET selection and light-load adaptability are critical.
Availability
LTC3835EDHC-1#TRPBF is available at Aetrix Electronics and suitable for telecom power shelves, automotive infotainment systems, and portable medical devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3835EDHC-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, serving industrial, automotive, communications, and healthcare markets.
The LTC3835-1 product line delivers high-efficiency, low-IQ synchronous buck controllers optimized for battery-backed and wide-input industrial power systems-designed specifically for applications demanding ultra-low standby power, precise voltage regulation, and flexible light-load behavior without sacrificing robustness.
FAQ
What is the minimum input voltage required for LTC3835EDHC-1#TRPBF to start switching?
The LTC3835EDHC-1#TRPBF features an undervoltage lockout (UVLO) with a turn-on threshold of 4V (typical) and a hysteresis of 0.5V. It begins switching only when VIN rises above 4V; operation ceases if VIN drops below 3.5V. This ensures reliable startup from nominal 5V or 12V rails and prevents erratic behavior during brownout conditions. The LTC3835EDHC-1#TRPBF remains fully functional across its specified 4V–36V range.
Does LTC3835EDHC-1#TRPBF support output voltage tracking during power-up?
Yes, the LTC3835EDHC-1#TRPBF supports precise output voltage tracking via its TRACK/SS pin. When an external resistor divider from a master supply is connected to TRACK/SS, the LTC3835EDHC-1#TRPBF regulates its VFB to match that voltage-causing its output to ramp in parallel with the master rail. This enables safe sequencing of multiple supplies in FPGAs or processors. The LTC3835EDHC-1#TRPBF also supports soft-start using a capacitor to ground on TRACK/SS.
How does the absence of CLKOUT, EXTVCC, and PGOOD affect system design with LTC3835EDHC-1#TRPBF?
The LTC3835EDHC-1#TRPBF omits CLKOUT, EXTVCC, and PGOOD pins compared to the standard LTC3835-reducing pin count and simplifying layout but removing built-in clock distribution, auxiliary bias capability, and power-good signaling. System designers must implement external sequencing or monitoring if needed. The LTC3835EDHC-1#TRPBF retains all core control functionality, including OPTI-LOOP®, light-load mode selection, and overvoltage protection, making it ideal for cost- and space-sensitive applications where those signals are not required.
Can LTC3835EDHC-1#TRPBF operate with 100% duty cycle in dropout?
No-the LTC3835EDHC-1#TRPBF supports up to 99.4% duty cycle (per datasheet Table "Maximum Duty Factor"), not 100%. In near-dropout conditions, it maintains regulation by maximizing on-time, but requires minimal voltage headroom (e.g., ~0.3V at high load) to sustain gate drive and internal bias. The device includes a dropout detector that forces periodic top-FET off-time to recharge the BOOST capacitor, ensuring robust operation down to VIN ≈ VOUT + 0.4V. This behavior is inherent to the LTC3835EDHC-1#TRPBF architecture.
What are the recommended external components for stable operation of LTC3835EDHC-1#TRPBF?
For stable operation, the LTC3835EDHC-1#TRPBF requires: (1) ≥4.7μF low-ESR tantalum or polymer capacitor from INTVCC to PGND; (2) 10μF ceramic input capacitor from VIN to PGND; (3) bootstrap capacitor (100nF X7R) between BOOST and SW; (4) Schottky diode (e.g., MBR0530) from INTVCC to BOOST; and (5) RSENSE value calculated as 80mV/IMAX. Layout best practices include separate SGND and PGND planes joined at a single point near the IC. These values ensure reliable startup, gate drive, and current sensing for the LTC3835EDHC-1#TRPBF.
LTC3835EDHC-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)
LTC3835EDHC-1#TRPBF FAQ
1.How can I place an order for LTC3835EDHC-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835EDHC-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 LTC3835EDHC-1#TRPBF reliable?
The price and inventory of LTC3835EDHC-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 LTC3835EDHC-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3835EDHC-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835EDHC-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835EDHC-1#TRPBF?
LTC3835EDHC-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835EDHC-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 LTC3835EDHC-1#TRPBF?
For technical support, including LTC3835EDHC-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835EDHC-1#TRPBF requirements.
6.How does Aetrix verify that LTC3835EDHC-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3835EDHC-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 LTC3835EDHC-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3835EDHC-1#TRPBF?
All LTC3835EDHC-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835EDHC-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 LTC3835EDHC-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3835EDHC-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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