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Analog Devices Inc. LTC1436AIGN#TRPBF
- Part No.:
- LTC1436AIGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1436AIGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,632
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Product details
Overview
LTC1436AIGN#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller with integrated adaptive power stage, supporting 3.5V to 36V input and programmable fixed-frequency operation up to 400kHz. It drives dual N-channel MOSFETs, delivers up to 99% duty cycle for ultra-low dropout, and integrates a 0.5A auxiliary linear regulator for low-noise CPU I/O or audio supplies - used in notebook computers and battery-powered instrumentation.
For engineers reviewing the LTC1436AIGN#TRPBF datasheet, LTC1436AIGN#TRPBF pinout, LTC1436AIGN#TRPBF application, or LTC1436AIGN#TRPBF equivalent, key selection criteria include its PLL-lockable oscillator, 300ns minimum on-time, remote voltage sense capability, and dual-mode low-load operation (Adaptive Power vs Burst Mode).
Technical Context
The LTC1436AIGN#TRPBF implements a constant-frequency current-mode control architecture with an error amplifier output (ITH) modulating peak inductor current via a 1.19V reference. Its Adaptive Power™ topology dynamically routes gate drive to either large (TGL/BG) or small (TGS) external MOSFETs based on load current, maintaining fixed-frequency operation down to ~1% of full load.
It features a secondary feedback input (SFB) enabling regulation independent of main output loading, a programmable soft-start via RUN/SS pin with 3µA current source, and a built-in power-on reset timer triggered after 65536 oscillator cycles (~300ms at 125kHz). The auxiliary regulator block supports 12V PNP-based linear outputs or comparator mode using AUXFB/AUXON/AUXDR pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide industrial and automotive battery inputs without pre-regulation. |
| Switching Frequency | 112–138kHz (standard), up to 400kHz - set by COSC capacitor; PLL-locked range extends to 200–240kHz. |
| Min On-Time | ≤300ns - enables high-frequency, low-duty-cycle operation for high VIN-to-VOUT ratios (e.g., 24V→1.2V). |
| Duty Cycle Max | 99% - allows ultra-low dropout operation, critical for battery end-of-life or low-VIN scenarios. |
| Aux Reg Output | 0.5A linear regulator - driven by external PNP; supports 12V (internal divider) or adjustable outputs via AUXFB. |
| Shutdown IQ | <25µA - enables micropower hold mode in portable systems during sleep states. |
| Remote Sense | VOSENSE + SENSE+/SENSE− - compensates for PCB trace IR drop to maintain ±0.8% load regulation. |
Pinout & Package
Package: 24-Lead Narrow SSOP (GN), 150-mil body, RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal circuitry and top/bottom MOSFET drivers; requires local 22µF decoupling to PGND. |
| SW | Switch node | Connects to inductor; swings from ground to VIN; must be routed with minimal loop area for EMI control. |
| TGL / BG / TGS | Gate drivers | TGL drives large top-side N-MOSFET; BG drives bottom N-MOSFET; TGS drives small top-side N-MOSFET for Adaptive Power mode. |
| VOSENSE | Main feedback input | Accepts remote-sensed output voltage; selects between internal dividers (via VPROG) or external resistor network. |
| RUN/SS | Enable & soft-start | Pull low to shut down; capacitor to ground sets ramp time (~0.5s/µF); clamps ITH during startup. |
| PLLIN / PLL LPF | PLL interface | PLLIN accepts external sync clock; PLL LPF is phase detector output and oscillator control voltage (0–2.4V). |
| AUXON / AUXDR / AUXFB | Auxiliary regulator control | AUXON enables 0.5A PNP-based linear regulator; AUXDR sinks base current; AUXFB sets output voltage (12V internal or external divider). |
| POR / LBO / LBI | System monitoring | POR asserts open-drain reset when VOUT deviates >7.5%; LBO/LBI form low-battery detector with 1.19V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ topology | Automatically switches gate drive between large (TGL/BG) and small (TGS) MOSFETs to sustain fixed-frequency operation down to ~1% load - avoids efficiency cliff of Burst Mode. |
| Programmable fixed frequency | Oscillator frequency set by COSC (100pF → 125kHz); PLL lockable to external clock (200–240kHz range) for noise-sensitive systems. |
| Ultra-low dropout support | 99% max duty cycle + dropout detector forces periodic off-time to recharge bootstrap capacitor - enables stable operation near VIN ≈ VOUT. |
| Integrated auxiliary linear regulator | 0.5A PNP-controlled output with selectable 12V (internal divider) or user-defined voltage (external AUXFB divider) - eliminates need for separate LDO in dual-rail systems. |
| Remote output voltage sensing | VOSENSE + dedicated SENSE+/SENSE− inputs compensate for PCB trace resistance - maintains tight regulation (<±0.8%) under dynamic load conditions. |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Notebook motherboard requiring efficient 3.3V/5V rails from 12–24V battery pack with low-noise auxiliary supply for audio codec. IC Role / Device Role / Timing Role: Primary buck controller for main logic rail; auxiliary regulator provides clean 12V for analog front-end; POR ensures reliable boot sequencing. Use Value: Adaptive Power maintains fixed-frequency operation across 1mA–5A load range, reducing EMI filtering complexity versus Burst Mode alternatives. | Use Scenario: Handheld multimeter with dual supply needs: 5V for microcontroller and 12V for LCD bias, powered by 9V alkaline stack. IC Role / Device Role / Timing Role: Main converter steps 9V→5V; auxiliary regulator generates 12V from same input using external PNP; LBO monitors battery depletion. Use Value: 3.5V min VIN and 99% duty cycle allow full functionality until battery drops below 5.5V - extending usable runtime by >20% vs standard controllers. |
| DC Power Distribution | Wireless Modem Power |
Use Scenario: Industrial DC distribution board converting 24V bus to 3.3V/5V for embedded controllers and sensors. IC Role / Device Role / Timing Role: High-efficiency primary regulator with remote sense for long cable runs; EXTVCC connected to VOUT for self-powered INTVCC. Use Value: EXTVCC switchover (4.7V threshold) reduces power loss by bypassing internal LDO - improves full-load efficiency by ~1.5% at 24V input. | Use Scenario: Cellular modem module needing regulated 3.3V from fluctuating Li-ion battery (3.0–4.2V) plus low-noise 1.8V for RF section. IC Role / Device Role / Timing Role: Buck controller operates in dropout (99% duty) during battery sag; auxiliary regulator supplies clean 1.8V via external divider on AUXFB. Use Value: Minimum 300ns on-time enables stable 3.3V output even at 4.2V→3.3V conversion - avoids need for inefficient LDO post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1436ACGN#TRPBF | Same die, 24-lead GN SSOP package with 0°C to 70°C rating (vs –40°C to 85°C for IGN). | Not suitable for extended temperature industrial or automotive environments. | Select LTC1436AIGN#TRPBF for designs requiring operation below 0°C or above 70°C. |
| LT3510EDD#TRPBF | Higher integration: includes internal 1.5A power switches; fixed 5V/3.3V options; no auxiliary regulator or PLL. | Lacks Adaptive Power, remote sense, and auxiliary 0.5A linear regulator - limited to simpler, lower-current applications. | Choose LT3510EDD#TRPBF only if system requires monolithic solution and sacrifices flexibility in output voltage, low-noise aux rail, and temperature range. |
Compared with LTC1436ACGN#TRPBF, the LTC1436AIGN#TRPBF adds extended temperature support essential for industrial deployment; versus LT3510EDD#TRPBF, it trades integration for design flexibility - retaining external MOSFET control, adaptive low-load behavior, and dual-rail capability.
Availability
LTC1436AIGN#TRPBF is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, and DC power distribution systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1436AIGN#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear ICs, including precision power management products.
The LTC1436A series belongs to Linear's high-performance synchronous buck controller family, designed specifically for efficiency-critical, multi-rail portable and industrial systems requiring adaptive light-load behavior and auxiliary linear regulation.
FAQ
What is the operating temperature range for the LTC1436AIGN#TRPBF?
The LTC1436AIGN#TRPBF is specified for –40°C to +85°C ambient operation, validated per the LTC143XAI temperature grade. This extended range supports industrial, automotive, and outdoor portable equipment where thermal margins exceed commercial-grade alternatives like the LTC1436ACGN#TRPBF.
How does the Adaptive Power™ mode function in the LTC1436AIGN#TRPBF?
The LTC1436AIGN#TRPBF uses Adaptive Power™ to automatically route gate drive from TGL/BG to TGS/BG when load current drops below ~1% of full scale, sustaining fixed-frequency operation instead of entering Burst Mode. This reduces output ripple and EMI while maintaining regulation accuracy - confirmed by typical performance curves showing continuous-mode operation down to 10mA at 5V output.
Can the LTC1436AIGN#TRPBF generate both 3.3V and 5V outputs simultaneously?
Yes - the LTC1436AIGN#TRPBF main controller regulates one output (e.g., 3.3V or 5V, selected via VPROG), while its integrated auxiliary regulator block (AUXON/AUXDR/AUXFB) can generate a second independent output such as 12V or 1.8V using an external PNP transistor and feedback divider. Both rails operate from the same VIN supply.
What is the purpose of the SFB pin on the LTC1436AIGN#TRPBF?
The SFB (Secondary Feedback) pin on the LTC1436AIGN#TRPBF enables forced continuous conduction mode regardless of main output loading, ensuring regulation stability in flyback-derived or transformer-coupled auxiliary supplies. When tied to ground, it guarantees uninterrupted switching; when connected to a resistive divider from a secondary winding, it maintains regulation even if the main output is unloaded.
Does the LTC1436AIGN#TRPBF support synchronization to an external clock?
Yes - the LTC1436AIGN#TRPBF variant with "-PLL" suffix (e.g., LTC1436AIGN-PLL#TRPBF) includes a phase-locked loop. The PLLIN pin accepts an external clock, and PLL LPF serves as both phase detector output and oscillator control voltage (0–2.4V), enabling frequency locking from 200–240kHz. Standard LTC1436AIGN#TRPBF lacks this feature.
LTC1436AIGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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, Power on Reset, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC1436AIGN#TRPBF FAQ
1.How can I place an order for LTC1436AIGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1436AIGN#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 LTC1436AIGN#TRPBF reliable?
The price and inventory of LTC1436AIGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1436AIGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1436AIGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1436AIGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1436AIGN#TRPBF?
LTC1436AIGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1436AIGN#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 LTC1436AIGN#TRPBF?
For technical support, including LTC1436AIGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1436AIGN#TRPBF requirements.
6.How does Aetrix verify that LTC1436AIGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1436AIGN#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 LTC1436AIGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1436AIGN#TRPBF?
All LTC1436AIGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1436AIGN#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 LTC1436AIGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1436AIGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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