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Analog Devices Inc. LTC3835EDHC-1#PBF
- Part No.:
- LTC3835EDHC-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3835EDHC-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
LTC3835EDHC-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-enabling use in automotive battery systems and telecom power supplies.
For engineers reviewing the LTC3835EDHC-1#PBF datasheet, LTC3835EDHC-1#PBF pinout, LTC3835EDHC-1#PBF application, or LTC3835EDHC-1#PBF equivalent, key selection criteria include its 80μA no-load IQ, phase-lockable 140–650kHz switching frequency, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, and absence of CLKOUT, EXTVCC, and PGOOD pins versus the standard LTC3835.
Technical Context
The LTC3835EDHC-1#PBF implements a constant-frequency current-mode control architecture with internal 0.8V reference and precision error amplifier. Its ITH pin controls peak inductor current via voltage-programmed current limit, while TRACK/SS enables soft-start or supply tracking through linear ramping.
It features integrated sleep mode activation at ITH < 0.4V (reducing IQ to 80μA), reverse-current prevention via IR comparator, and programmable light-load operation-Burst Mode (PLLIN/MODE < 0.7V), pulse-skipping (0.7V < PLLIN/MODE < INTVCC−0.5V), or forced continuous (PLLIN/MODE = INTVCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and 48V telecom intermediate bus inputs. |
| No-Load Quiescent Current | 80μA - extends runtime in battery-powered digital devices and IoT edge nodes. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures stable core voltage for FPGAs and microprocessors. |
| Switching Frequency Range | 140kHz to 650kHz (phase-lockable) - balances efficiency vs. size: 250kHz for high-efficiency 12V→3.3V conversion; 650kHz for compact 5V→1.2V point-of-load. |
| Duty Cycle Max | 99.4% - enables operation with VIN as low as VOUT + 0.2V, critical for cold-crank automotive scenarios. |
| Current Sense Threshold | 80–115mV - sets precise overcurrent protection with external RSENSE; supports IMAX up to 25A with 3.2mΩ sense resistor. |
| Soft-Start Charge Current | 0.75–1.35μA - defines linear VOUT ramp time when using external capacitor on TRACK/SS pin. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed SGND pad (Pin 17), θJA = 43.5°C/W, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (1) | PLL loop filter node | Connects external RC network to set PLL bandwidth; floating = 400kHz nominal, GND = 250kHz, INTVCC = 530kHz. |
| ITH (2) | Error amplifier output / current limit control | Voltage sets peak inductor current; <0.4V triggers sleep mode; used for compensation network connection. |
| TRACK/SS (3) | Soft-start and tracking input | Internal 1μA pull-up charges external capacitor for controlled VOUT ramp; 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 | Reference for analog circuitry; must be isolated from PGND to prevent noise coupling into feedback path. |
| PGND (6) | Power ground | Return path for bottom MOSFET source, Schottky anode, and input capacitor negative terminal. |
| BG (7) | Bottom gate driver output | Drives synchronous N-MOSFET gate from 0V to INTVCC (5.25V); fast 40–90ns rise/fall times minimize switching loss. |
| INTVCC (8) | Internal LDO output | 5.0–5.5V regulated supply for drivers and logic; requires ≥4.7μF low-ESR capacitor to PGND. |
| VIN (9) | Main input supply | Accepts 4–36V; powers INTVCC LDO and provides energy to boost capacitor during top-FET drive. |
| SW (10) | Switch node | Connects to inductor; swings from ~–0.3V (Schottky drop) to VIN; critical for EMI layout and bootstrap charging. |
| 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 diode to INTVCC; supplies floating bias for TG driver during high-side conduction. |
| RUN (13) | Enable control | Logic-level shutdown: <0.7V disables controller and reduces IQ to 10μA; internal 0.5μA pull-up enables auto-start. |
| SENSE– (14) | Current sense negative input | Low-side current sensing node; common-mode range 0V to 10V; used with SENSE+ for differential current measurement. |
| SENSE+ (15) | Current sense positive input | High-side or low-side current sensing node; paired with SENSE– to detect inductor current for cycle-by-cycle limiting. |
| PLLIN/MODE (16) | Sync input / light-load mode select | External clock input (140–650kHz lock range) or DC bias to select Burst Mode (<0.7V), pulse-skipping (0.7–4.7V), or continuous (INTVCC). |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitor values (10μF–1000μF) and ESR (1mΩ–100mΩ), reducing design iterations. |
| Adjustable Light-Load Operation | Three selectable modes (Burst, pulse-skipping, continuous) let designers optimize efficiency vs. ripple/noise trade-offs per application. |
| 99.4% Maximum Duty Cycle | Enables regulation with VIN only ~200mV above VOUT, supporting cold-crank (6.5V) start in 12V automotive systems. |
| 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 Sleep Mode | Reduces total system IQ to 80μA at no load without external circuitry-critical for always-on battery backup and sensor nodes. |
Applications
| Automotive Infotainment Power | Telecom Intermediate Bus Converter |
|---|---|
Use Scenario: Powering FPGA, DSP, and display controllers in head units with 12V battery input subject to cold-crank (6.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3.3V/5V rails from unregulated automotive battery; manages startup sequencing via TRACK/SS. Use Value: 99.4% duty cycle maintains regulation during cold-crank; 80μA IQ extends battery life in parked accessory mode. | Use Scenario: Converting 48V telecom backplane to 12V intermediate bus in base station power shelves. IC Role / Device Role / Timing Role: High-efficiency step-down controller driving discrete N-MOSFETs; synchronized to system clock via PLLIN/MODE to reduce EMI. Use Value: Phase-lockable 140–650kHz operation enables deterministic noise spectrum placement; 4V–36V input range covers brownout and overvoltage conditions. |
| Industrial PLC I/O Module | Portable Medical Imaging Sensor |
Use Scenario: Generating isolated 5V and 3.3V rails from 24V DC industrial supply in programmable logic controller modules. IC Role / Device Role / Timing Role: Main DC/DC controller for non-isolated auxiliary supplies; uses pulse-skipping mode to maintain low ripple during analog signal acquisition. Use Value: Pulse-skipping mode provides lower output ripple than Burst Mode while achieving >85% efficiency at 10mA load-ideal for mixed-signal environments. | Use Scenario: Battery-powered ultrasound probe requiring quiet, efficient 1.8V and 3.3V rails from single-cell Li-ion (2.7–4.2V). IC Role / Device Role / Timing Role: Low-IQ synchronous controller enabling multi-rail power with soft-start coordination across subsystems. Use Value: 80μA no-load IQ doubles usable battery capacity; TRACK/SS pin allows coordinated ramp-up of analog and digital supplies to avoid latch-up. |
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 |
|---|---|---|---|
| LTC3835EGN-1#PBF | Same functional spec, but in 16-lead SSOP package (θJA = 90°C/W); includes CLKOUT, EXTVCC, and PGOOD pins. | SSOP offers easier prototyping and thermal inspection; PGOOD enables system power-good signaling not available on DHC variant. | Select when board space permits larger package and PGOOD status reporting is required for system sequencing. |
| MP2491C | Monolithic 2A buck converter (integrated MOSFETs); fixed 500kHz fSW; no PLL sync; 100μA IQ; 4.5–36V input. | Eliminates external MOSFETs and gate drive complexity but lacks adjustable frequency, tracking, or ultra-low IQ. | Select for cost-sensitive, low-current applications where integration outweighs flexibility and efficiency optimization. |
Compared with LTC3835EGN-1#PBF, the LTC3835EDHC-1#PBF trades PGOOD/CLKOUT functionality and thermal performance for 48% smaller footprint and lower θJA-making it optimal for space-constrained, thermally managed designs. Versus MP2491C, it delivers superior light-load efficiency and design flexibility at the cost of external FET layout complexity.
Availability
LTC3835EDHC-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment, telecom power conversion, industrial PLCs, and portable medical devices requiring stable component supply across extended temperature ranges.
Supply support for LTC3835EDHC-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3835-1 product line delivers high-efficiency, low-IQ synchronous buck controllers optimized for automotive, industrial, and telecom applications demanding wide input range, precise regulation, and robust transient response.
FAQ
What is the maximum duty cycle supported by the LTC3835EDHC-1#PBF?
The LTC3835EDHC-1#PBF supports a maximum duty cycle of 99.4%, enabling operation with input voltage as low as VOUT + 200mV. This capability is essential for automotive cold-crank scenarios where battery voltage drops to 6.5V while maintaining 5V output. The dropout detector forces periodic top-FET off-time to recharge the bootstrap capacitor under sustained 99%+ conduction.
How does the LTC3835EDHC-1#PBF achieve 80μA quiescent current?
The LTC3835EDHC-1#PBF achieves 80μA no-load IQ through integrated sleep mode: when ITH voltage falls below 0.4V, internal circuitry disables gate drivers, oscillator, and most analog blocks while retaining reference and bias-drawing only 80μA from VIN. This state is automatically exited when output voltage droop raises ITH above 0.425V, restoring full regulation without external intervention.
Can the LTC3835EDHC-1#PBF synchronize to an external clock, and what is its lock range?
Yes, the LTC3835EDHC-1#PBF can synchronize to an external clock applied to the PLLIN/MODE pin. Its phase-locked loop guarantees lock from 140kHz to 650kHz, with typical capture range extending to 115kHz–800kHz. An external RC filter on PLLLPF sets loop bandwidth; the internal phase detector adjusts PLLLPF voltage to align TG turn-on with the external clock's rising edge.
What is the purpose of the TRACK/SS pin on the LTC3835EDHC-1#PBF?
The TRACK/SS pin on the LTC3835EDHC-1#PBF serves dual functions: soft-start and supply tracking. Internally pulled up with 1μA, it ramps linearly when capacitively loaded-controlling VOUT rise time. When driven by a resistor divider from another supply, it forces the LTC3835EDHC-1#PBF output to track that supply's startup profile, preventing sequencing violations in multi-rail systems.
Does the LTC3835EDHC-1#PBF provide output overvoltage protection, and how does it operate?
Yes, the LTC3835EDHC-1#PBF includes dedicated output overvoltage protection. If VFB rises more than 10% above its 0.8V regulation point (i.e., >0.88V), the controller immediately disables the top MOSFET and activates the bottom MOSFET to sink current until VFB returns within regulation. This hardware-level protection responds in microseconds and operates independently of the main control loop.
LTC3835EDHC-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)
LTC3835EDHC-1#PBF FAQ
1.How can I place an order for LTC3835EDHC-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835EDHC-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 LTC3835EDHC-1#PBF reliable?
The price and inventory of LTC3835EDHC-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 LTC3835EDHC-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3835EDHC-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835EDHC-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835EDHC-1#PBF?
LTC3835EDHC-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835EDHC-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 LTC3835EDHC-1#PBF?
For technical support, including LTC3835EDHC-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835EDHC-1#PBF requirements.
6.How does Aetrix verify that LTC3835EDHC-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3835EDHC-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 LTC3835EDHC-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3835EDHC-1#PBF?
All LTC3835EDHC-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835EDHC-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 LTC3835EDHC-1#PBF part is unused and in its original packaging.
Return procedure for LTC3835EDHC-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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