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Analog Devices Inc. LTC1436ACGN#PBF
- Part No.:
- LTC1436ACGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1436ACGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,466
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Product details
Overview
LTC1436ACGN#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller with integrated adaptive power stage, driving external N-channel MOSFETs in fixed-frequency or PLL-synchronized mode. It supports 3.5V–36V input, delivers up to 5A output via dual N-MOSFET drive (TGL/BG), and includes an auxiliary 0.5A linear regulator for low-noise I/O or audio supplies - used in notebook CPU core voltage regulation and portable instrumentation power rails.
For engineers reviewing the LTC1436ACGN#PBF datasheet, LTC1436ACGN#PBF pinout, LTC1436ACGN#PBF application, or LTC1436ACGN#PBF equivalent, key selection criteria include its programmable fixed frequency (112–240 kHz), ≤300 ns minimum on-time for high-frequency/low-duty-cycle operation, 99% dropout capability, remote sense support, and dual-mode low-load efficiency (Adaptive Power™ vs Burst Mode®).
Technical Context
The LTC1436ACGN#PBF implements a constant-frequency current-mode control architecture with internal error amplifier (EA), peak-current sensing via SENSE+/SENSE–, and adaptive gate drive routing between TGL (high-current) and TGS (low-current) outputs. Its oscillator frequency is set by COSC and can be phase-locked via PLLIN/PLL LPF pins, enabling synchronization to external clocks up to ±30% frequency deviation.
It integrates a dedicated auxiliary regulator control block (AUXON/AUXFB/AUXDR) supporting both linear regulation (with external PNP) and comparator functions, plus independent power-on reset (POR) and low-battery detection (LBI/LBO) circuits - all operating from a 5V INTVCC rail derived either internally or from EXTVCC ≥4.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - enables direct operation from 12V/24V industrial rails or wide-range battery inputs without pre-regulation. |
| Switching Frequency | 112–240 kHz (programmable via COSC & PLL LPF) - balances efficiency, EMI, and component size; supports synchronization to external clock sources. |
| Minimum On-Time | ≤300 ns - allows stable 1.19V–9V output generation at high VIN/VOUT ratios (e.g., 24V→1.2V @ 5% duty cycle). |
| Current Sense Threshold | 130–180 mV - sets peak inductor current limit; enables precise RSENSE-based IMAX scaling (e.g., 0.02Ω → ~7.5A max peak). |
| Duty Cycle Capability | Up to 99% - supports ultra-low dropout operation essential for battery-powered systems near end-of-life voltage. |
| Shutdown Quiescent Current | <25 µA - ensures minimal battery drain during system sleep states in portable devices. |
| Auxiliary Regulator Output | 0.5A linear supply - provides low-noise, low-dropout bias for CPU I/O, audio codecs, or analog sensors without adding discrete LDOs. |
Pinout & Package
Package: 24-Lead Narrow SSOP (GN), 150 mil width, θJA = 110°C/W. RoHS-compliant, lead-free (Pb-free) finish per #PBF suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies control logic and top/bottom gate drivers; requires local 22µF decoupling to PGND. |
| INTVCC | Internal 5V regulator output | Powers internal circuitry and driver stages; must be decoupled with ≥2.2µF tantalum to PGND. |
| TGL / BG | High-side / low-side gate drivers | Drive external N-MOSFETs synchronously; TGL swings from SW to VIN+INTVCC; BG swings 0V–INTVCC. |
| TGS | Small MOSFET gate driver | Enables Adaptive Power™ mode; drives smaller N-MOSFET + Schottky for low-load efficiency; open = Burst Mode®. |
| VOSENSE / VPROG | Feedback and output voltage selection | VOSENSE accepts remote-sensed output voltage; VPROG selects 1.19V (open), 3.3V (0V), or 5V (INTVCC) via internal divider. |
| RUN/SS | Enable & soft-start control | Pull <1.3V to shut down; capacitor to ground sets ramp time (~0.5s/µF); internal 3µA current source charges CSS. |
| PLLIN / PLL LPF | Phase detector input / oscillator control | PLLIN accepts external sync signal; PLL LPF sets oscillator frequency (0–2.4V = –30% to +30% fOSC); tie to SGND if unused. |
| AUXON / AUXFB / AUXDR | Auxiliary regulator enable/feedback/output | AUXON enables 0.5A linear regulator; AUXFB senses output; AUXDR drives external PNP base or acts as comparator output. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ Output Stage | Automatically switches gate drive from TGL/BG (high load) to TGS-only (low load), maintaining fixed-frequency operation down to ~1% rated current - avoids audible noise and improves light-load efficiency vs Burst Mode®. |
| Programmable Fixed-Frequency PLL | Supports external clock synchronization via PLLIN; PLL LPF voltage adjusts oscillator frequency over ±30%, enabling EMI reduction through spread-spectrum or multi-rail coordination. |
| Remote Output Voltage Sensing | VOSENSE pin accepts feedback from point-of-load, compensating for PCB trace IR drop - critical for tight-tolerance CPU core supplies (±0.8% total regulation including line/load/temp). |
| Integrated Auxiliary Linear Regulator | 0.5A PNP-based linear regulator controlled by AUXON/AUXFB/AUXDR - eliminates need for separate low-noise LDO in dual-rail systems (e.g., 5V main + 12V aux for display backlight or sensor bias). |
| Low-Battery Detection & POR | Dedicated LBI/LBO comparator (1.19V threshold) and POR timer (65536 cycles ≈ 300ms at 125kHz) provide reliable system-level power sequencing and brownout protection without external components. |
Applications
| Battery-Powered Instrumentation | Notebook CPU Core Supply |
|---|---|
Use Scenario: Portable handheld multimeter with dual ADCs, microcontroller, and LCD requiring clean, stable 3.3V and 1.2V rails from single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: LTC1436ACGN#PBF serves as primary buck controller for 1.2V core rail and auxiliary regulator driver for 3.3V I/O rail - managing dynamic load transients and battery voltage sag. Use Value: 99% duty cycle enables full regulation down to 2.7V input; Adaptive Power™ maintains >85% efficiency at 10mA load; remote sense ensures ±1% output accuracy at load point. | Use Scenario: Embedded x86 processor subsystem in ruggedized tablet requiring tightly regulated 1.1V core voltage with fast transient response and thermal derating. IC Role / Device Role / Timing Role: LTC1436ACGN#PBF controls synchronous buck stage delivering up to 5A peak current; VOSENSE connects directly to CPU VDD pin for true point-of-load regulation. Use Value: ≤300 ns minimum on-time supports 1.1V@24V input (4.6% duty cycle); 150 mV current sense threshold enables accurate current limiting with 0.01Ω RSENSE; POR ensures deterministic boot after cold start. |
| Wireless Modem Power Management | Industrial DC Power Distribution |
Use Scenario: LTE Cat-M1 modem module powered from 12V vehicle bus, needing 3.3V digital and 5V RF supply with low quiescent current during idle. IC Role / Device Role / Timing Role: LTC1436ACGN#PBF generates 3.3V rail; auxiliary regulator (AUXON-enabled) provides 5V for PA bias; RUN/SS enables rapid wake/sleep cycling. Use Value: Shutdown IQ <25 µA extends battery backup life; PLL synchronization aligns switching edges with baseband clock to reduce conducted EMI; foldback current limit protects against antenna mismatch faults. | Use Scenario: DIN-rail mounted PLC I/O module converting 24VDC field supply to isolated 5V/3.3V logic rails with high reliability and thermal margin. IC Role / Device Role / Timing Role: LTC1436ACGN#PBF operates as primary non-isolated buck controller; EXTVCC tied to VOUT enables efficient self-powered operation; SFB pin forces continuous conduction for predictable thermal behavior. Use Value: Wide 3.5–36V input range accommodates 24V ±20% industrial tolerance; 110°C/W θJA allows operation at 70°C ambient without derating; built-in LBO detects undervoltage on upstream 24V supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1436AIGN#PBF | Same die, extended temperature grade (–40°C to 85°C) and higher θJA (110°C/W); identical pinout and electrical specs. | Suitable for automotive under-hood or industrial outdoor deployments where ambient exceeds 70°C. | Select when operating junction temperature must remain within spec across –40°C to 85°C ambient, especially with limited airflow or high power dissipation. |
| LTC1437ACG#PBF | 28-pin SSOP package; adds NC pin and LBO/LBI functionality; same control architecture but different pin mapping (e.g., LBO replaces PLLIN). | Offers integrated low-battery comparator without external components; lacks PLL synchronization capability. | Choose when low-battery monitoring is required and PLL sync is unnecessary; verify PCB layout compatibility due to 28-pin footprint and relocated pins. |
Compared with LTC1436AIGN#PBF, the LTC1436ACGN#PBF trades extended temperature rating for lower cost and same thermal performance in commercial environments; versus LTC1437ACG#PBF, it retains PLL synchronization at the expense of integrated LBO/LBI, making it preferable for EMI-sensitive multi-rail systems requiring clock alignment.
Availability
LTC1436ACGN#PBF is available at Aetrix Electronics and suitable for notebook power management, portable instrumentation, and wireless modem designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1436ACGN#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC1436A product line was designed for high-efficiency, low-noise DC/DC conversion in space-constrained portable and battery-operated systems - emphasizing adaptive light-load operation, wide input range, and integrated auxiliary regulation.
FAQ
What is the maximum supported input voltage for the LTC1436ACGN#PBF?
The LTC1436ACGN#PBF has an absolute maximum input voltage rating of 36V on the VIN pin. Continuous operation is specified from 3.5V to 30V, with 36V representing the upper limit for transient conditions only. Exceeding 36V risks permanent damage. For reliable 24V system designs, the LTC1436ACGN#PBF provides sufficient margin while maintaining full specification compliance across temperature.
Does the LTC1436ACGN#PBF support remote voltage sensing, and how is it implemented?
Yes, the LTC1436ACGN#PBF supports true remote output voltage sensing via the VOSENSE pin. This pin accepts feedback directly from the load point (e.g., CPU VDD pin), bypassing PCB trace resistance. When combined with the VPROG pin configuration, VOSENSE enables precise regulation independent of IR drop - achieving ±0.8% total output accuracy including line, load, and temperature effects. The internal error amplifier compares VOSENSE to a 1.19V reference.
How does the Adaptive Power™ feature in the LTC1436ACGN#PBF improve efficiency at light loads?
The Adaptive Power™ feature in the LTC1436ACGN#PBF dynamically routes gate drive from the high-current TGL/BG outputs to the low-current TGS output when load falls below ~1% of rated current. This avoids large MOSFET gate charge losses inherent in Burst Mode®, maintaining fixed-frequency operation and reducing audible noise. As a result, efficiency remains above 85% at 10mA load - roughly 10× better than standard Burst Mode® at same condition.
Can the LTC1436ACGN#PBF be synchronized to an external clock, and what pins are involved?
Yes, the LTC1436ACGN#PBF (specifically the -PLL variant) supports external clock synchronization via the PLLIN and PLL LPF pins. PLLIN accepts a square-wave sync signal; the phase detector output on PLL LPF adjusts the oscillator frequency over a 0–2.4V range (±30% of nominal). This enables EMI reduction and multi-rail timing coordination. Note: Standard LTC1436ACGN#PBF includes PLL circuitry - no separate part number is needed for sync capability.
What is the role of the AUXON, AUXFB, and AUXDR pins on the LTC1436ACGN#PBF?
The AUXON, AUXFB, and AUXDR pins configure the integrated auxiliary regulator/comparator block. AUXON enables or disables the 0.5A linear regulator (logic-high = active). AUXFB senses the auxiliary output voltage - internally divided for 12V operation when AUXDR >9.5V, or externally configured otherwise. AUXDR drives the base of an external PNP transistor (regulator mode) or acts as open-drain comparator output (when pulled up externally). Together, they eliminate need for discrete LDOs in dual-rail systems.
LTC1436ACGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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, Power on Reset, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC1436ACGN#PBF FAQ
1.How can I place an order for LTC1436ACGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1436ACGN#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 LTC1436ACGN#PBF reliable?
The price and inventory of LTC1436ACGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1436ACGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1436ACGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1436ACGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1436ACGN#PBF?
LTC1436ACGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1436ACGN#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 LTC1436ACGN#PBF?
For technical support, including LTC1436ACGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1436ACGN#PBF requirements.
6.How does Aetrix verify that LTC1436ACGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1436ACGN#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 LTC1436ACGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1436ACGN#PBF?
All LTC1436ACGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1436ACGN#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 LTC1436ACGN#PBF part is unused and in its original packaging.
Return procedure for LTC1436ACGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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