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Analog Devices Inc. LTC1435ACG#PBF
- Part No.:
- LTC1435ACG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1435ACG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,376
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Product details
Overview
LTC1435ACG#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 operation. It supports 3.5V–36V input, delivers output voltages from 1.19V to 9V, achieves ≤300ns minimum on-time and 99% duty cycle for ultra-low dropout, and targets high-efficiency battery-powered DC/DC conversion in portable computing and wireless infrastructure.
For engineers reviewing the LTC1435ACG#PBF datasheet, LTC1435ACG#PBF pinout, LTC1435ACG#PBF application, or LTC1435ACG#PBF equivalent, key selection criteria include its dual N-MOSFET synchronous drive architecture, programmable soft-start via external capacitor, secondary feedback control (SFB) for multi-output regulation, remote voltage sensing capability, and logic-controlled micropower shutdown with IQ < 25µA.
Technical Context
The LTC1435ACG#PBF implements a constant-frequency current-mode control loop where peak inductor current is set by the ITH voltage, derived from error amplifier output referenced to 1.19V. Its oscillator frequency is externally programmable via COSC capacitor (112–138kHz typical with 100pF), and it features dedicated SFB pin for forced continuous operation during secondary winding regulation.
It integrates dual high-current gate drivers (TG and BG) with 50–150ns transition times, internal 5V INTVCC regulator with EXTVCC switchover at 4.7V, and foldback current limiting option. The device operates across 0°C to 70°C ambient (LTC1435AC grade) and supports burst mode operation below ~100mA load to maintain high light-load efficiency.
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 including 3-cell Li-ion packs. |
| Output Voltage Range | 1.19V to 9V - set via external resistive divider on VOSENSE; reference voltage tightly specified at 1.19V ±12mV over temperature. |
| Minimum On-Time | ≤300ns - allows stable high-frequency, high-input-to-low-output conversion (e.g., 24V→1.2V at 400kHz) without pulse-skipping instability. |
| Duty Cycle Range | 5% to 99% - supports both high-ratio step-down and near-lossless dropout operation extending runtime in battery systems. |
| Shutdown Current | <25µA - ensures negligible quiescent drain during system sleep modes in portable instruments and PDAs. |
| Operating Frequency | Programmable 112–400kHz - set by external COSC capacitor; higher frequencies reduce passive size but increase gate charge losses. |
| Current Sense Threshold | 150mV max - defines peak current limit via RSENSE; enables accurate current monitoring with 0.033Ω sense resistor for 3A output. |
Pinout & Package
Package: 16-lead plastic SSOP (G package), 5.3mm × 6.2mm body, 0.635mm pitch, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC | Oscillator timing capacitor connection | Sets switching frequency; 100pF yields ~125kHz; requires stable ceramic capacitor with low leakage. |
| RUN/SS | Soft-start ramp and shutdown enable | Capacitor to ground sets startup time (~0.5s/µF); pulled below 1.3V disables all functions with <25µA IQ. |
| ITH | Error amplifier compensation node | Voltage controls current comparator threshold; nominal range 0–2.5V; used for loop compensation and current limiting. |
| SFB | Secondary feedback input | Pull to GND forces continuous mode; connect to secondary winding divider for auxiliary output regulation. |
| VOSENSE | Main output voltage feedback | Receives resistive divider signal; internally compared to 1.19V reference for precise output regulation. |
| SENSE+ / SENSE− | Differential current sense inputs | Measure voltage across external RSENSE; built-in offset sets trip point at 150mV for accurate overcurrent protection. |
| TG / BG | Top/bottom N-MOSFET gate drivers | Deliver 2A peak current; TG swings relative to SW node; BG swings from PGND to INTVCC (5V). |
| INTVCC | Internal 5V supply output | Powers control circuitry and drivers; must be decoupled with ≥2.2µF tantalum; switchover to EXTVCC occurs above 4.7V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual N-MOSFET synchronous drive | Eliminates external Schottky loss; enables >90% efficiency at 3A with Si4412DY MOSFETs and proper layout. |
| Programmable fixed-frequency architecture | External COSC capacitor allows optimization of efficiency vs. size trade-off without changing IC or firmware. |
| Secondary feedback (SFB) control | Guarantees regulation of auxiliary outputs (e.g., 5V rail) independent of main output loading, critical for multi-rail systems. |
| Remote output voltage sensing | Compensates for PCB trace IR drop; maintains ±0.8% load regulation even with 100mΩ path resistance. |
| Burst Mode™ operation | Maintains >75% efficiency down to 10mA load by disabling gate drives during light-load intervals, reducing RF noise. |
Applications
| Notebook Power Rails | Wireless Modem Core Supply |
|---|---|
Use Scenario: Generating 1.2V/3A CPU core voltage from 12V intermediate bus in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary step-down controller managing synchronous MOSFET switching, current-mode loop stability, and dynamic voltage scaling. Use Value: 99% duty cycle enables extended battery life during low-power states; ≤300ns on-time supports 24V→1.2V conversion without pulse skipping. | Use Scenario: Providing regulated 3.3V/2A supply to LTE baseband processor and RF transceiver in cellular modems. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller with burst mode for standby power reduction and SFB for auxiliary 5V LDO biasing. Use Value: Micropower shutdown (<25µA) preserves battery during idle; programmable soft-start prevents inrush into sensitive RF circuitry. |
| Portable Instrument ADC Bias | Battery-Operated IoT Sensor Node |
Use Scenario: Delivering ultra-stable 5.0V/1A supply to precision SAR ADC and analog front-end in handheld test equipment. IC Role / Device Role / Timing Role: Low-noise synchronous buck controller using remote sensing and tight line/load regulation (±0.8%) to minimize measurement drift. Use Value: 1.19V reference tolerance ±12mV and 0.01%/V line regulation ensure consistent full-scale accuracy across 9–30V battery input range. | Use Scenario: Converting 3.7V Li-ion battery output to 1.8V/500mA for microcontroller and BLE radio in long-life sensor nodes. IC Role / Device Role / Timing Role: Wide-input buck controller with burst mode and 99% dropout enabling full utilization of battery discharge curve. Use Value: 3.5V minimum VIN and 99% duty cycle extend usable battery capacity by >15% versus standard controllers; low IQ extends shelf life. |
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 |
|---|---|---|---|
| LTC3891EMSE#PBF | Wider VIN (4–60V), integrated MOSFET drivers with higher peak current (4A), supports phase modulation; no SFB pin. | Targeted at higher-voltage industrial systems; lacks secondary feedback for auxiliary rail regulation. | Select when input exceeds 36V or higher gate drive is needed; not suitable where SFB-based multi-output coordination is required. |
| LM5116MH/NOPB | Fixed 100–600kHz frequency, no SFB pin, lower IQ (12µA shutdown), wider temp range (–40°C to 125°C), different pinout. | Optimized for automotive under-hood use; lacks secondary feedback and remote sensing capability. | Prefer for high-temp environments without need for auxiliary output regulation; requires PCB redesign due to non-pin-compatible layout. |
Compared with LTC1435ACG#PBF, LTC3891EMSE#PBF offers higher voltage capability but sacrifices SFB-based multi-output coordination, while LM5116MH/NOPB provides broader temperature support and lower shutdown current but omits remote sensing and secondary feedback-making LTC1435ACG#PBF uniquely suited for portable multi-rail systems requiring precise auxiliary regulation.
Availability
LTC1435ACG#PBF is available at Aetrix Electronics and suitable for notebook power management, wireless modem DC/DC conversion, and portable instrumentation requiring stable component supply with guaranteed long-term sourcing.
Supply support for LTC1435ACG#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 high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC1435A belongs to Linear's synchronous buck controller family designed specifically for high-efficiency, low-noise DC/DC conversion in space-constrained portable electronics with demanding battery-life requirements.
FAQ
What is the maximum input voltage rating for the LTC1435ACG#PBF?
The LTC1435ACG#PBF has an absolute maximum input supply voltage (VIN) rating of 36V. Operation beyond this voltage risks permanent damage. The device is rated for continuous operation from 3.5V to 30V, with 36V representing the absolute upper limit under transient conditions only. Always observe derating guidelines and ensure input transient suppression in 24V industrial applications.
Does the LTC1435ACG#PBF integrate power MOSFETs?
No, the LTC1435ACG#PBF is a controller-only IC and does not integrate power MOSFETs. It drives external N-channel MOSFETs via high-current TG and BG gate driver outputs. This architecture allows designers to select optimal MOSFETs for specific voltage, current, and thermal requirements-such as Si4412DY for 3A applications-as shown in the典型 application circuit.
How is the switching frequency set on the LTC1435ACG#PBF?
The switching frequency of the LTC1435ACG#PBF is set by an external capacitor connected from the COSC pin to ground. A 100pF capacitor yields a typical frequency of 125kHz. The relationship is nonlinear: fOSC (kHz) ≈ 8.4×10⁸ / (COSC (pF) + 11). Frequency can be adjusted from ~112kHz up to 400kHz, with higher values increasing gate loss and reducing efficiency.
What is the purpose of the SFB pin on the LTC1435ACG#PBF?
The SFB (Secondary Feedback) pin on the LTC1435ACG#PBF enables regulation of auxiliary outputs using a secondary winding on the main inductor. When pulled low, it forces continuous conduction mode regardless of load on the main output. This ensures stable voltage on auxiliary rails (e.g., 5V bias for LDOs) even when the primary output is lightly loaded-a key feature for multi-rail portable systems.
Can the LTC1435ACG#PBF operate with a 3.7V lithium-ion battery input?
Yes, the LTC1435ACG#PBF supports input voltages as low as 3.5V, making it fully compatible with single-cell Li-ion batteries (nominal 3.7V, range 3.0–4.2V). Its 99% maximum duty cycle enables efficient low-dropout operation down to VOUT = 3.66V at VIN = 3.7V, preserving battery runtime. Ensure RSENSE and inductor values are selected for stable light-load burst mode behavior.
LTC1435ACG#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1435ACG#PBF FAQ
1.How can I place an order for LTC1435ACG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1435ACG#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 LTC1435ACG#PBF reliable?
The price and inventory of LTC1435ACG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1435ACG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1435ACG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1435ACG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1435ACG#PBF?
LTC1435ACG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1435ACG#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 LTC1435ACG#PBF?
For technical support, including LTC1435ACG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1435ACG#PBF requirements.
6.How does Aetrix verify that LTC1435ACG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1435ACG#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 LTC1435ACG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1435ACG#PBF?
All LTC1435ACG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1435ACG#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 LTC1435ACG#PBF part is unused and in its original packaging.
Return procedure for LTC1435ACG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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