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Analog Devices Inc. LTC1435IG#PBF
- Part No.:
- LTC1435IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1435IG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,081
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Product details
Overview
LTC1435IG#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external N-channel MOSFETs in fixed-frequency current-mode architecture. It operates from 3.5V to 36V input, delivers output voltages from 1.19V to 9V, supports up to 99% duty cycle for ultra-low dropout, and achieves >95% efficiency at 1A load with 3.3V output - enabling high-efficiency power conversion in portable battery-powered systems.
For engineers reviewing the LTC1435IG#PBF datasheet, LTC1435IG#PBF pinout, LTC1435IG#PBF application, or LTC1435IG#PBF equivalent, this page provides verified technical context on burst mode operation, secondary feedback control (SFB), programmable soft start, remote voltage sensing, and foldback current limiting - all critical for low-noise, high-efficiency DC/DC design in space-constrained industrial and portable applications.
Technical Context
The LTC1435IG#PBF implements a constant-frequency current-mode control loop where peak inductor current is set by the ITH pin voltage, and regulation is maintained via VOSENSE feedback referenced to a precise 1.19V internal bandgap. Its dual N-channel gate drivers (TG and BG) support bootstrap-based top-side drive with INTVCC-regulated 5V bias, enabling logic-level MOSFET compatibility.
Burst Mode™ operation is triggered by inductor current reversal detection (via SENSE+/-), reducing switching activity at light loads to maintain >85% efficiency down to 10mA. Secondary feedback (SFB) forces continuous conduction when pulled low - essential for multi-output flyback-derived supplies - while EXTVCC switchover (4.5V–4.7V threshold) allows efficient INTVCC sourcing from VOUT or auxiliary windings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide-range industrial and automotive inputs, including 24V rail and 12V battery systems. |
| Output Voltage Range | 1.19V to 9V - set by external resistor divider on VOSENSE; 1.19V reference enables accurate 1.2V–5V core/logic rails. |
| Max Duty Cycle | 99% - enables ultra-low dropout operation (e.g., 5V out from 5.1V in), extending runtime in battery-powered devices. |
| Switching Frequency | 112–138 kHz (COSC = 100pF) - externally programmable via capacitor; optimized for low EMI and high efficiency with standard magnetics. |
| Shutdown Current | <25 µA - ensures micropower shutdown for long-term storage or sleep modes in portable instruments. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial ambient environments without derating. |
| Current Sense Threshold | 130–180 mV - sets overcurrent protection point; combined with RSENSE determines max output current (e.g., 3.5A with 0.033Ω). |
Pinout & Package
Package: 16-lead plastic SSOP (G package), 0.150" wide, JEDEC MS-013AC compliant. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC | Oscillator timing capacitor connection | Sets switching frequency; 100pF yields ~125kHz - direct correlation enables precise EMI tuning. |
| RUN/SS | Soft-start ramp and shutdown enable | Capacitor to ground sets startup time (~0.5s/µF); <1.3V forces shutdown with IQ < 25µA. |
| ITH | Error amplifier output / current limit control | Voltage controls peak inductor current; clamped during soft start to prevent overshoot. |
| SFB | Secondary winding feedback input | Pull low to force continuous mode; critical for regulating auxiliary outputs in flyback-derived topologies. |
| VOSENSE | Main output voltage feedback | Connects to resistive divider; servo-controlled to 1.19V reference for ±0.8% load regulation. |
| SENSE+ / SENSE− | Differential current sense inputs | Measure voltage across RSENSE; built-in offset enables accurate current limiting independent of common-mode voltage. |
| TG / BG | Top/bottom N-MOSFET gate drivers | High-current (2A peak) drivers with 50–150ns transition times - minimize switching losses with logic-level MOSFETs. |
| INTVCC / EXTVCC | Internal 5V regulator output / external supply input | EXTVCC >4.7V disables internal LDO and connects external source - improves efficiency by reducing VIN current draw. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains >85% efficiency at 10mA load by disabling switching until output droop triggers restart - reduces no-load power loss in always-on systems. |
| Secondary feedback (SFB) control | Guarantees regulation of main output even under heavy auxiliary load by forcing continuous conduction - eliminates cross-regulation errors in multi-winding designs. |
| Programmable soft start | External CSS capacitor prevents inrush current and enables controlled power sequencing - avoids bus collapse when multiple LTC1435IG#PBF regulators start simultaneously. |
| Remote output voltage sense | Separate VOSENSE pin enables Kelvin sensing at load - compensates for PCB trace IR drop to hold ±0.5% regulation at point-of-load. |
| Foldback current limiting (optional) | Reduces peak current during short-circuit events - limits thermal stress on external MOSFETs and inductor without requiring additional circuitry. |
Applications
| Portable Medical Monitors | Notebook Power Management |
|---|---|
Use Scenario: Battery-powered ECG and pulse oximeter units requiring stable 3.3V and 5V rails with minimal heat generation and long runtime. IC Role / Device Role / Timing Role: Primary step-down controller managing main system power from single-cell Li-ion (3.0–4.2V) or dual-cell (6–8.4V) packs. Use Value: 99% duty cycle enables full battery utilization down to 3.4V input; Burst Mode maintains >80% efficiency at standby currents below 50µA. | Use Scenario: Core voltage regulation for embedded controllers and display interfaces in ultra-thin notebooks with strict thermal envelopes. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller delivering 1.8V/3A and 5V/2A from 12V or 19V adapter input. Use Value: Programmable COSC allows frequency optimization to avoid audible noise bands; remote sensing holds ±0.3% output accuracy across 0–70°C. |
| Industrial IoT Gateways | Test & Measurement Equipment |
Use Scenario: DIN-rail mounted edge gateway powering ARM SoC, cellular modem, and isolated RS-485 transceivers from 24V DC supply. IC Role / Device Role / Timing Role: Main DC/DC controller converting 24V to 5V/3.3V with secondary winding feedback for isolated 12V analog supply. Use Value: SFB pin ties to auxiliary winding to enforce regulation stability despite variable modem transmit current bursts. | Use Scenario: Portable oscilloscope and spectrum analyzer requiring low-noise, tightly regulated analog and digital supplies. IC Role / Device Role / Timing Role: Low-EMI synchronous buck controller generating clean 3.3V for ADCs and FPGAs from 12V intermediate rail. Use Value: Fixed-frequency operation with external COSC enables predictable EMI filtering; <25µA shutdown current preserves battery charge during transport. |
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 |
|---|---|---|---|
| LM5116MH/NOPB | Wider VIN range (6–100V), higher max frequency (1MHz), no integrated 5V LDO - requires external bias supply. | Targeted at high-input industrial and automotive systems; lacks Burst Mode for ultra-low-IQ operation. | Choose LM5116MH/NOPB for >60V input or 1MHz switching; LTC1435IG#PBF preferred for battery-fed 3.5–36V systems needing micropower shutdown. |
| TPS40200DR | Lower IQ (100µA active), no Burst Mode, fixed 300kHz oscillator, no SFB pin - simpler but less flexible control. | Cost-sensitive industrial supplies where secondary feedback and light-load efficiency are not required. | Use TPS40200DR for basic 3.5–52V step-down where SFB and sub-25µA shutdown are unnecessary; LTC1435IG#PBF adds precision regulation and adaptive light-load behavior. |
Compared with LM5116MH/NOPB and TPS40200DR, the LTC1435IG#PBF uniquely combines 3.5V minimum input, 99% duty cycle, Burst Mode™, and SFB-driven cross-regulation immunity - making it optimal for portable and multi-rail industrial converters where input headroom, light-load efficiency, and auxiliary output stability are critical.
Availability
LTC1435IG#PBF is available at Aetrix Electronics and suitable for portable medical monitors, notebook power management, industrial IoT gateways, and test & measurement equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1435IG#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 digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1435IG#PBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, low-noise synchronous buck controller applications in battery-operated and thermally constrained systems.
FAQ
What is the maximum input voltage rating for the LTC1435IG#PBF?
The LTC1435IG#PBF has an absolute maximum input voltage (VIN) rating of 36V. Continuous operation is specified from 3.5V to 30V, with transient tolerance up to 36V. Exceeding 36V may cause permanent damage to the IC. This rating supports use in 24V industrial systems and dual-cell Li-ion battery applications.
How does the SFB pin affect operation of the LTC1435IG#PBF?
The SFB pin on the LTC1435IG#PBF enables secondary winding feedback control. When pulled below 1.19V, it forces continuous conduction mode regardless of load - ensuring regulation stability in flyback-derived multi-output supplies. When tied to INTVCC or left open, the LTC1435IG#PBF operates in normal current-mode control with Burst Mode enabled at light loads.
Can the LTC1435IG#PBF drive standard-threshold MOSFETs?
Yes, the LTC1435IG#PBF can drive standard-threshold MOSFETs if EXTVCC is supplied from an external 5–10V source. With internal INTVCC regulation only (EXTVCC open), gate drive is limited to ~5V - requiring logic-level MOSFETs (VGS(th) < 2.5V). For standard devices (VGS(th) < 4V), connect EXTVCC to VOUT ≥ 5V or an auxiliary 5–10V rail.
What is the purpose of the RUN/SS pin on the LTC1435IG#PBF?
The RUN/SS pin on the LTC1435IG#PBF serves dual functions: applying <1.3V shuts down the LTC1435IG#PBF with input current reduced to <25µA, while connecting a capacitor to ground provides programmable soft-start timing (~0.5s per µF). This enables controlled power-up sequencing and zero-power standby in battery-critical applications.
Does the LTC1435IG#PBF include an internal voltage reference?
Yes, the LTC1435IG#PBF includes a precision 1.19V internal bandgap reference used for VOSENSE feedback regulation. This reference exhibits ±0.01%/V line regulation and supports ±0.8% load regulation across temperature - enabling accurate output voltage setting from 1.19V to 9V using external resistor dividers.
LTC1435IG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- 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):
- 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
LTC1435IG#PBF FAQ
1.How can I place an order for LTC1435IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1435IG#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 LTC1435IG#PBF reliable?
The price and inventory of LTC1435IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1435IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1435IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1435IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1435IG#PBF?
LTC1435IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1435IG#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 LTC1435IG#PBF?
For technical support, including LTC1435IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1435IG#PBF requirements.
6.How does Aetrix verify that LTC1435IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1435IG#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 LTC1435IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1435IG#PBF?
All LTC1435IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1435IG#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 LTC1435IG#PBF part is unused and in its original packaging.
Return procedure for LTC1435IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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