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Analog Devices Inc. LTC1435AIG#TRPBF
- Part No.:
- LTC1435AIG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1435AIG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,820
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Product details
Overview
LTC1435AIG#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external N-channel MOSFETs in fixed-frequency current-mode operation. It supports 3.5V–36V input, delivers regulated output from 1.19V to 9V, achieves ≤300ns minimum on-time and 99% duty cycle for ultra-low dropout, and targets high-efficiency power conversion in portable battery-powered systems.
For engineers reviewing the LTC1435AIG#TRPBF datasheet, LTC1435AIG#TRPBF pinout, LTC1435AIG#TRPBF application, or LTC1435AIG#TRPBF equivalent, key selection criteria include its wide VIN range, secondary feedback (SFB) capability for multi-output regulation, programmable soft start via external capacitor, logic-controlled micropower shutdown (<25µA), and compatibility with low-RDS(ON) logic-level MOSFETs in narrow SSOP-16 packaging.
Technical Context
The LTC1435AIG#TRPBF implements a constant-frequency current-mode control architecture with dual N-channel gate drivers (TG, BG), internal 5V LDO (INTVCC), and external oscillator timing via COSC pin. Its error amplifier output (ITH) modulates peak inductor current, while VOSENSE monitors output voltage through an external resistive divider referenced to a 1.19V internal bandgap.
Secondary feedback (SFB) forces continuous conduction mode when pulled low, suppressing Burst Mode noise; RUN/SS combines enable control and soft-start ramping via external capacitor; SENSE+ and SENSE− interface with a current-sense resistor (RSENSE) to set overcurrent thresholds up to 150mV. The device operates across –40°C to +85°C and supports EXTVCC switchover for efficiency-optimized bias sourcing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - Enables direct operation from 12V/24V industrial rails and wide-range battery inputs (e.g., 3-cell Li-ion to 10-cell lead-acid). |
| Output Voltage Range | 1.19V to 9V - Set by external resistor divider on VOSENSE; 1.19V reference tolerance ±1.02% ensures tight DC regulation. |
| Minimum On-Time | ≤300ns - Supports high-frequency, high-input-to-low-output conversion (e.g., 24V→3.3V at 500kHz) without pulse-skipping instability. |
| Duty Cycle Range | 5% to 99% - Enables both high-ratio step-down and near-lossless dropout operation (e.g., 5.5V→5V @ 99% duty cycle). |
| Shutdown Current | <25µA - Measured at VRUN/SS = 0V; enables long-term battery hold-up in portable instruments and PDAs. |
| Oscillator Frequency | 112–138kHz (COSC = 100pF) - Programmable via external capacitor; trade-off between size (smaller L/C) and efficiency (lower gate loss). |
| Current Sense Threshold | 130–180mV - Sets peak inductor current limit; combined with RSENSE determines maximum output current (e.g., 0.033Ω → ~4.5A max). |
| Operating Temperature | –40°C to +85°C - Qualified per LTC1435AIG grade; suitable for industrial and automotive under-hood auxiliary supplies. |
Pinout & Package
Package: 16-lead plastic SSOP (G package), 5.0mm × 6.2mm body, 0.635mm pitch, exposed pad not present. RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC | Oscillator Timing Input | Connects to external capacitor (e.g., 100pF) to set switching frequency; charge/discharge current defines fOSC. |
| RUN/SS | Enable & Soft-Start Control | Pull <1.3V to shut down; external capacitor ramps ITH from 30% to full scale over ~0.5s/µF for controlled startup. |
| ITH | Error Amplifier Output / Current Limit Setpoint | Voltage controls peak inductor current; 0–2.5V range maps to full current range; used for loop compensation. |
| SFB | Secondary Feedback Input | Drives continuous mode when pulled low; connects to secondary winding divider in multi-output flyback-derived topologies. |
| SGND | Small-Signal Ground Reference | Must be routed separately from PGND to avoid noise coupling into VOSENSE and SENSE pins. |
| VOSENSE | Main Output Voltage Feedback | Receives divided VOUT; internal 1.19V reference sets regulation point; load regulation ±0.8% over full current range. |
| SENSE− / SENSE+ | Current Sense Differential Inputs | Measure voltage across RSENSE; built-in offset enables accurate current limiting independent of common-mode voltage (0–5V). |
| PGND | Power Ground Return | Low-impedance return for bottom MOSFET source and CIN (–); must tie to PCB ground plane under IC. |
| BG | Bottom N-Channel Gate Driver Output | Drives gate of synchronous rectifier MOSFET; swing = 0V to INTVCC (≈5V); capable of 2A peak for fast turn-on/turn-off. |
| INTVCC | Internal 5V Regulator Output | Supplies gate drivers and internal circuitry; requires ≥2.2µF tantalum bypass to PGND; load regulation ±1% up to 15mA. |
| VIN | Main Input Supply | Accepts 3.5–36V; powers internal LDO and provides bootstrap recharge path; decouple with ≥22µF low-ESR capacitor. |
| SW | Switch Node Connection | Connects to inductor and drain of top MOSFET; voltage swings from –0.4V (Schottky drop) to VIN; high di/dt node requiring tight layout. |
| BOOST | Bootstrap Supply for Top Driver | Return node for bootstrap capacitor (CB); voltage = INTVCC + SW; enables floating gate drive for high-side N-MOSFET. |
| TG | Top N-Channel Gate Driver Output | Floating driver output referenced to SW; swing = INTVCC superimposed on SW; drives gate of main switch MOSFET. |
| EXTVCC | External Bias Supply Input | Switches internal LDO off when >4.7V; connect to VOUT (≥5V) to reduce input supply current and improve efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual N-Channel Synchronous Drive | Eliminates external Schottky losses; TG/BG drivers support logic-level MOSFETs (RDS(ON) < 20mΩ) for >90% efficiency at 3A. |
| Programmable Fixed-Frequency Operation | External COSC capacitor allows precise frequency tuning (100kHz–400kHz) to balance EMI, size, and efficiency in space-constrained designs. |
| Secondary Feedback (SFB) Pin | Enables regulation of isolated secondary outputs (e.g., aux 12V rail) without optocoupler; forces continuous mode to suppress Burst Mode noise. |
| Logic-Controlled Micropower Shutdown | IQ < 25µA in shutdown with VRUN/SS = 0V - preserves battery life in handheld medical devices and remote sensors. |
| Low Minimum On-Time (≤300ns) | Supports high VIN/VOUT ratios (e.g., 24V→3.3V) at high frequencies without subharmonic oscillation or duty-cycle limitation. |
| Remote Output Voltage Sense (VOSENSE) | Compensates for IR drop in PCB traces and connectors; maintains ±0.5% load regulation at full rated current. |
Applications
| Portable Medical Instruments | Notebook & Palmtop Computers |
|---|---|
Use Scenario: Power management in battery-operated ultrasound probes and glucose meters requiring stable 3.3V/5V rails during intermittent sensing bursts. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating main system voltage from single Li-ion cell or 2S pack. Use Value: 99% duty cycle extends runtime in dropout; Burst Mode maintains >85% efficiency at 10mA load; SFB enables auxiliary sensor bias rail regulation. |
Use Scenario: Core voltage regulation for Intel Atom or ARM-based embedded computing modules with dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency step-down controller driving discrete N-MOSFETs for CPU I/O and memory subsystems. Use Value: ≤300ns on-time supports 12V→1.8V conversion at 300kHz; EXTVCC tied to VOUT reduces input current by ~30%; remote sense ensures <±10mV output deviation. |
| Cellular Baseband Modems | Industrial DC Power Distribution |
Use Scenario: Compact 5V/3A supply for LTE/Wi-Fi modem modules in ruggedized IoT gateways operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Main DC/DC controller interfacing with PMIC sequencing and thermal monitoring circuits. Use Value: –40°C to +85°C qualification ensures reliability; foldback current limiting protects against antenna mismatch faults; PGND/SGND separation minimizes RF coupling. |
Use Scenario: Distributed 5V/3.3V generation from 24V factory bus in PLC I/O modules and sensor hubs with strict EMC requirements. IC Role / Device Role / Timing Role: Isolated secondary-side buck controller synchronized to primary flyback via SFB pin. Use Value: SFB-driven continuous mode eliminates Burst Mode EMI; wide VIN accommodates 24V ±20% industrial rail; low IQ reduces standby power in always-on nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610IMSE#TRPBF | Integrated power stage (2A), 3V–42V input, 200kHz–3MHz sync frequency, no SFB pin, higher quiescent current (2.5µA active). | Replaces discrete MOSFET design with monolithic solution; lacks secondary feedback for multi-output regulation. | Choose LT8610 for space-constrained designs where integration outweighs need for SFB or external MOSFET optimization. |
| TPS54332DR | 3.5V–28V input, integrated 0.115Ω high-side FET, 500kHz fixed frequency, no SFB, shutdown current 1.5µA, SOIC-8 package. | Lower VIN max and no secondary feedback; simpler layout but limited to single-output applications. | Choose TPS54332 for cost-sensitive, single-rail 3.3V/5V supplies where SFB and ultra-wide VIN are unnecessary. |
Compared with LT8610IMSE#TRPBF and TPS54332DR, the LTC1435AIG#TRPBF uniquely supports secondary winding feedback for isolated multi-output systems, offers wider VIN (36V vs 28V/42V), and enables discrete MOSFET optimization for high-current or high-reliability applications - at the cost of additional external components and layout complexity.
Availability
LTC1435AIG#TRPBF is available at Aetrix Electronics and suitable for portable medical instruments, notebook computers, cellular modems, and industrial DC power distribution systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1435AIG#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1435AIG#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, wide-input synchronous buck controller applications in portable, industrial, and communications equipment where discrete MOSFET optimization and secondary feedback are critical.
FAQ
What is the recommended external MOSFET type for use with the LTC1435AIG#TRPBF?
The LTC1435AIG#TRPBF requires logic-level N-channel MOSFETs due to its 5V INTVCC gate drive. For top-side switching, Si4412DY (30V, 12mΩ) is validated in the datasheet; bottom-side devices must handle reverse recovery-preferably with low Qrr. RDS(ON) ≤ 20mΩ and CRSS < 50pF optimize efficiency at 1–3A loads. Always verify BVDSS > 1.25×VINMAX.
Does the LTC1435AIG#TRPBF support true current-mode control with slope compensation?
Yes, the LTC1435AIG#TRPBF implements inherent current-mode control using sensed inductor current via SENSE+/SENSE−. Slope compensation is not required because the device uses a constant-frequency architecture with peak-current sensing and internal oscillator synchronization - eliminating subharmonic instability even at duty cycles >50%.
How does the SFB pin affect Burst Mode operation in the LTC1435AIG#TRPBF?
Pulling the SFB pin below 1.19V forces continuous conduction mode and disables Burst Mode operation. This is used to maintain regulation on secondary windings in flyback-derived topologies or to reduce conducted EMI in noise-sensitive applications. When SFB is open or tied to INTVCC, Burst Mode activates automatically at light loads.
Can the LTC1435AIG#TRPBF operate with an input voltage lower than 3.5V?
No - the absolute minimum input voltage for reliable operation of the LTC1435AIG#TRPBF is 3.5V. Below this, internal biasing fails and INTVCC cannot regulate. For sub-3.5V inputs, consider alternatives like the LTC3630 (2.5V–20V) or redesign with a pre-regulator stage.
What is the purpose of the EXTVCC pin on the LTC1435AIG#TRPBF, and how should it be connected?
The EXTVCC pin switches the INTVCC power source between the internal 5V LDO and an external supply. Connect EXTVCC to VOUT if VOUT ≥ 5V to reduce input supply current and improve efficiency by ~5–10%. Do not exceed 10V on EXTVCC, and ensure EXTVCC < VIN. Leaving EXTVCC open defaults to internal LDO operation.
LTC1435AIG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- 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):
- 3.5V ~ 30V
- Frequency - Switching:
- Up to 400kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1435AIG#TRPBF FAQ
1.How can I place an order for LTC1435AIG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1435AIG#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 LTC1435AIG#TRPBF reliable?
The price and inventory of LTC1435AIG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1435AIG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1435AIG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1435AIG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1435AIG#TRPBF?
LTC1435AIG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1435AIG#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 LTC1435AIG#TRPBF?
For technical support, including LTC1435AIG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1435AIG#TRPBF requirements.
6.How does Aetrix verify that LTC1435AIG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1435AIG#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 LTC1435AIG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1435AIG#TRPBF?
All LTC1435AIG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1435AIG#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 LTC1435AIG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1435AIG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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