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Analog Devices Inc. LTC3835EFE#PBF
- Part No.:
- LTC3835EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3835EFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:222
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Product details
Overview
LTC3835EFE#PBF from Analog Devices (formerly Linear Technology) is a high-performance, low-quiescent-current synchronous step-down switching regulator controller driving dual N-channel MOSFETs. It delivers 0.8V to 10V output with ±1% accuracy, operates from 4V to 36V input, supports phase-lockable 140kHz–650kHz switching, and enables 99% duty cycle for ultra-low dropout-ideal for battery-powered telecom and automotive power systems.
For engineers reviewing the LTC3835EFE#PBF datasheet, LTC3835EFE#PBF pinout, LTC3835EFE#PBF application, or LTC3835EFE#PBF equivalent, key selection criteria include its 80µA no-load IQ, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, TRACK/SS-controlled soft-start/tracking, PGOOD monitoring, and EXTVCC-enabled gate drive efficiency optimization.
Technical Context
The LTC3835EFE#PBF implements a constant-frequency current-mode control architecture with an error amplifier (EA) regulating VFB to 0.8V reference and modulating ITH voltage to set peak inductor current. Its dual-gate drivers (TG/BG) support synchronous rectification with precise timing control, including TG/BG dead-time management and reverse-current prevention via IR comparator.
It integrates a dual-input LDO (VIN- or EXTVCC-powered) delivering 5.25V or 7.5V INTVCC, a phase-locked loop (PLL) with 140–650kHz lock range, and selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous) controlled by PLLIN/MODE voltage level-enabling optimized efficiency vs. ripple/noise tradeoffs across load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and wide-range industrial DC inputs. |
| Output Voltage Range | 0.8V to 10V - programmable via external resistor divider; 0.8V reference with ±1% accuracy ensures tight regulation. |
| No-Load Quiescent Current | 80µA - extends runtime in always-on battery systems such as IoT sensors and telematics modules. |
| Switching Frequency | 140kHz to 650kHz (phase-lockable) - balances efficiency (lower f) and component size (higher f); PLL enables multi-phase synchronization. |
| Duty Cycle Max | 99% - enables operation with VIN only ~1% above VOUT, critical for low-dropout applications like post-regulation of buck-derived rails. |
| Shutdown IQ | 10µA - minimizes standby leakage in system-level power sequencing and sleep-state management. |
| Current Sense Threshold | 80mV to 115mV - adjustable via ITH voltage; enables accurate current limiting across varying RSENSE values and load conditions. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE), exposed pad (Pin 21) soldered to SGND for thermal and electrical integrity; θJA = 35°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (Pin 1) | Open-drain clock output | Provides synchronized clock signal for daisy-chained PolyPhase® controllers; enables precise interleaving without external timing components. |
| ITH (Pin 3) | Error amplifier output / compensation node | Controls peak inductor current via voltage-modulated current comparator trip point; interface for OPTI-LOOP® network to stabilize transient response over COUT/ESR variation. |
| TRACK/SS (Pin 4) | Soft-start and voltage tracking input | Internal 1µA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider from master supply to enforce startup sequencing. |
| VFB (Pin 5) | Feedback voltage sense input | Compares divided output voltage against 0.8V reference; high-impedance input (<50nA bias) minimizes divider loading error. |
| SGND (Pins 6, 21) | Small-signal ground reference | Must be isolated from PGND to prevent noise coupling into feedback and error amplifier paths; exposed pad requires solid PCB thermal connection. |
| PGND (Pin 7) | Power ground return | Connects to bottom MOSFET source, Schottky cathode, and CIN(–); forms high-current return path separate from sensitive analog ground. |
| BG (Pin 8) | Bottom gate driver output | Drives synchronous N-MOSFET gate from 0V to INTVCC; fast rise/fall times (40–90ns) reduce switching losses and EMI. |
| INTVCC (Pin 9) | Internal LDO output | Supplies 5.25V (VIN-powered) or 7.5V (EXTVCC-powered) to drivers and logic; requires ≥4.7µF low-ESR capacitor for stability under dynamic load. |
| EXTVCC (Pin 10) | External LDO input | Enables higher-efficiency gate drive when supplied >4.7V (e.g., from downstream converter output); switchover hysteresis prevents oscillation near threshold. |
| VIN (Pin 11) | Main input supply | Accepts 4V–36V unregulated input; bypass capacitor required between VIN and SGND to suppress high-frequency noise and supply transients. |
| SW (Pin 12) | Switch node | Connects to inductor and top MOSFET drain; swings from ~–0.3V (Schottky drop) to VIN; high dv/dt demands careful layout to minimize EMI. |
| TG (Pin 13) | Top gate driver output | Floating driver output referenced to SW node; swing = INTVCC – 0.5V superimposed on SW voltage; drives high-side N-MOSFET with bootstrap-assisted level shift. |
| BOOST (Pin 14) | Bootstrap supply | Charged via external diode from INTVCC during BG-on phase; supplies floating TG driver; capacitor must withstand (VIN + INTVCC) voltage rating. |
| RUN (Pin 15) | Enable/shutdown control | Logic-level input: <0.7V disables controller and reduces IQ to 10µA; internal 0.5µA pull-up enables automatic start-up when released. |
| SENSE– (Pin 16) | Current sense negative input | High-side or low-side current sense return; differential pair with SENSE+ rejects common-mode noise up to 11V. |
| SENSE+ (Pin 17) | Current sense positive input | Connects to shunt resistor high side or low side; total input bias current ≤–660µA ensures accurate sensing at low currents. |
| PGOOD (Pin 18) | Power-good open-drain output | Asserts low when VFB deviates >±10% from 0.8V; compatible with microcontroller reset inputs and system power sequencing logic. |
| PLLIN/MODE (Pin 19) | PLL sync input / light-load mode select | Accepts external clock (140–650kHz) for phase alignment; DC voltage selects Burst Mode® (<0.7V), pulse-skipping (0.9V–INTVCC–0.5V), or forced continuous (tied to INTVCC). |
| PHASMD (Pin 20) | Phase select control | Configures CLKOUT phase relationship relative to TG edge-supports 0° or 180° offset for two-phase PolyPhase® designs. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide ranges of output capacitance (e.g., 10µF–150µF) and ESR (e.g., 1mΩ–100mΩ), eliminating need for custom compensation per design. |
| Low-IQ Light-Load Operation | 80µA quiescent current in Burst Mode® maintains >85% efficiency at 1mA load, extending battery life in always-on portable equipment. |
| Programmable Soft-Start & Tracking | Single external capacitor or resistor divider on TRACK/SS enables controlled VOUT ramp rate or precise startup sequencing with other rails-critical for FPGA/CPU core voltage coordination. |
| Robust Overvoltage Protection | PGOOD monitors VFB with ±10% trip window and independent overvoltage lockout (8–12% above setpoint) prevents damage to downstream loads during fault conditions. |
| Flexible Gate Drive Power | Auto-switching between VIN- and EXTVCC-powered INTVCC allows use of efficient secondary rail (e.g., 5V or 12V) to drive gates-reducing heat dissipation in high-current applications. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V/5V logic rails in head-unit MCU, display controller, and audio codec from 12V battery with cold-crank tolerance down to 4V. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency conversion, soft-start sequencing, and PGOOD signaling to enable downstream regulators and processors. Use Value: 99% duty cycle sustains regulation during engine cranking; 80µA IQ preserves battery charge during vehicle sleep mode; TRACK/SS coordinates startup with CAN transceiver and memory rails. | Use Scenario: Generating isolated 5V and 3.3V supplies for digital I/O, analog front-end, and communication interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-reliability step-down controller with robust current foldback and overvoltage protection for field-side power domains subject to surge and ESD stress. Use Value: Adjustable current limit via ITH and SENSE pins protects against shorted outputs; ±1% VOUT accuracy ensures sensor ADC reference stability; EXTVCC option improves thermal performance in enclosed enclosures. |
| Telecom Base Station RF Card | Battery-Powered Test Equipment |
Use Scenario: Providing clean, low-noise 5V and 12V rails for RF transceivers, DACs, and clock synthesizers in 4G/5G remote radio units. IC Role / Device Role / Timing Role: Multi-phase capable controller supporting CLKOUT synchronization to system clock tree for jitter-sensitive analog circuits. Use Value: Phase-locked operation eliminates beat frequencies between converters; selectable light-load modes (Burst/Pulse-Skipping) suppress audible noise while maintaining >90% efficiency at partial load. | Use Scenario: Portable oscilloscope or multimeter requiring long battery life, fast wake-up, and precise analog supply rails (±12V, 5V, 3.3V) from single Li-ion cell or pack. IC Role / Device Role / Timing Role: High-efficiency primary controller enabling deep-sleep states with 10µA shutdown IQ and rapid soft-start recovery via TRACK/SS. Use Value: 80µA operating IQ extends runtime beyond 100 hours on 2000mAh battery; precision 0.8V reference ensures consistent ADC/DAC performance across temperature; PGOOD validates rail readiness before measurement acquisition. |
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 |
|---|---|---|---|
| LTC3833EFE#PBF | Fixed 300kHz frequency; no PLL or CLKOUT; no EXTVCC; 16-pin TSSOP package. | Lacks PolyPhase® synchronization and flexible gate drive power; suited for cost-sensitive, single-phase designs where frequency agility is unnecessary. | Select when phase-locking, multi-phase expansion, or EXTVCC efficiency gains are not required-reduces BOM count and layout complexity. |
| MP2918GL-Z | Monolithic 6A buck converter (integrated MOSFETs); 4.5–18V input; 0.6–5.5V output; 500kHz fixed frequency; no TRACK/SS or PLL. | Higher integration but lower input voltage range and no soft-start/tracking capability; limited to mid-power applications without external FET scalability. | Choose for space-constrained, medium-current designs where integrated FETs simplify layout-but avoid when >6A output, wide VIN, or precise sequencing is needed. |
Compared with LTC3833EFE#PBF, the LTC3835EFE#PBF adds PLL synchronization, CLKOUT, EXTVCC, and TRACK/SS-making it superior for scalable, low-noise, multi-rail systems. Versus MP2918GL-Z, it offers wider VIN, external FET flexibility, and advanced sequencing-justifying use in high-reliability, high-performance power architectures.
Availability
LTC3835EFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, telecom RF cards, and battery-powered test equipment requiring stable component supply, long-term lifecycle assurance, and full production traceability.
Supply support for LTC3835EFE#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous reliability testing and automotive-grade qualification.
The LTC3835EFE#PBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding DC/DC conversion in battery-powered, automotive, and telecom infrastructure where low IQ, precise regulation, and robust fault protection are mandatory.
FAQ
What is the maximum supported switching frequency for the LTC3835EFE#PBF?
The LTC3835EFE#PBF supports a phase-lockable switching frequency range from 140kHz to 650kHz. When using the internal oscillator with PLLLPF tied to INTVCC, nominal frequency is 530kHz; with PLLLPF floating, it is 400kHz. External synchronization guarantees lock from 140kHz to 650kHz per datasheet specifications.
How does the TRACK/SS pin function during startup of the LTC3835EFE#PBF?
The TRACK/SS pin on the LTC3835EFE#PBF controls output voltage ramp rate via an internal 1µA current source charging an external capacitor to ground. As the pin voltage rises linearly from 0V to ≥0.8V, the LTC3835EFE#PBF regulates VFB to match it-producing smooth, programmable soft-start. It also accepts resistor dividers from other supplies to enforce voltage tracking during power-up.
Can the LTC3835EFE#PBF operate with input voltage below 4V?
No-the LTC3835EFE#PBF has a guaranteed minimum operating input voltage of 4V, with undervoltage lockout (UVLO) releasing at 4V (typical) and asserting below 3.5V. Operation below 4V is outside specification and may result in unstable regulation or failure to start; it is not recommended for reliable designs.
What is the purpose of the EXTVCC pin on the LTC3835EFE#PBF?
The EXTVCC pin on the LTC3835EFE#PBF provides an alternative input to the internal LDO that powers INTVCC. When EXTVCC exceeds 4.7V, the controller switches from VIN-powered 5.25V LDO to EXTVCC-powered 7.5V LDO-improving gate drive efficiency and reducing thermal load, especially when powering high-current external MOSFETs from a pre-regulated rail.
Does the LTC3835EFE#PBF support forced continuous conduction mode (FCCM)?
Yes-the LTC3835EFE#PBF supports forced continuous conduction mode via the PLLIN/MODE pin: tying it to INTVCC forces FCCM operation. This ensures uninterrupted inductor current at light loads, minimizing output voltage ripple and audio-band noise-beneficial for noise-sensitive analog or RF circuits despite slightly reduced light-load efficiency compared to Burst Mode®.
LTC3835EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3835EFE#PBF FAQ
1.How can I place an order for LTC3835EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835EFE#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 LTC3835EFE#PBF reliable?
The price and inventory of LTC3835EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3835EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3835EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835EFE#PBF?
LTC3835EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835EFE#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 LTC3835EFE#PBF?
For technical support, including LTC3835EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835EFE#PBF requirements.
6.How does Aetrix verify that LTC3835EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3835EFE#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 LTC3835EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3835EFE#PBF?
All LTC3835EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835EFE#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 LTC3835EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3835EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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