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Analog Devices Inc. LTC1436ACGN#TRPBF
- Part No.:
- LTC1436ACGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1436ACGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,019
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Product details
Overview
LTC1436ACGN#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller with integrated dual N-channel MOSFET gate drivers, programmable fixed-frequency PLL-lockable oscillator, and auxiliary 0.5A linear regulator. It operates from 3.5V to 36V input, delivers up to 5A output at 1.19V–9V, and supports adaptive power mode for constant-frequency operation down to ~1% load in portable computing and battery-powered instrumentation.
For engineers reviewing the LTC1436ACGN#TRPBF datasheet, LTC1436ACGN#TRPBF pinout, LTC1436ACGN#TRPBF application, or LTC1436ACGN#TRPBF equivalent, key selection criteria include its 24-lead SSOP package, 125kHz typical oscillator frequency (COSC = 100pF), ≤300ns minimum on-time, 99% dropout duty cycle, and dual-mode gate drive (TGL/TGS/BG) enabling high-efficiency light-load operation without burst-mode noise.
Technical Context
The LTC1436ACGN#TRPBF implements a current-mode, constant-frequency step-down architecture with adaptive power control: TGL and BG drive large external N-MOSFETs for high-current operation, while TGS drives a smaller MOSFET (or enables Burst Mode when open) for low-load efficiency. Its error amplifier output (ITH) controls peak inductor current via a 1.19V reference, and SFB pin enforces continuous conduction during secondary-winding regulation.
It integrates a 5V internal LDO (INTVCC) with EXTVCC switchover at 4.7V, a logic-controlled micropower shutdown (IQ < 25µA), programmable soft-start via RUN/SS capacitor, and a dedicated low-battery comparator (LBI/LBO) with 1.19V trip threshold. The PLLIN/PLL LPF interface allows external synchronization or frequency shifting between 112kHz–240kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 36V - supports wide-input industrial and automotive battery systems without pre-regulation |
| fOSC (Typ) | 125kHz (COSC = 100pF) - balances efficiency and component size; adjustable 112–240kHz via PLL |
| tON(MIN) | ≤300ns - enables high-frequency, low-duty-cycle conversion (e.g., 5V→1.2V at 1MHz) |
| Duty Cycle Max | 99% - sustains regulation under near-dropout conditions (VIN ≈ VOUT + 0.1V) |
| Output Voltage | 1.19V to 9V - set by VPROG pin state or external resistor divider on VOSENSE |
| IQ (Shutdown) | <25µA - preserves battery life in always-on portable devices during standby |
| ∆VSENSE(MAX) | 150mV - defines current-sense threshold accuracy for RSENSE-based overcurrent protection |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN), 150-mil body width, θJA = 110°C/W. RoHS-compliant, tape-and-reel (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 3.5V–36V; must be decoupled to SGND with ≥22µF capacitor |
| INTVCC | Internal 5V regulator output | Powers control circuitry and drivers; requires ≥2.2µF tantalum to PGND |
| TGL | Top-gate driver (large MOSFET) | Floating output driving high-side N-MOSFET; swing = SW to SW+INTVCC |
| TGS | Top-gate driver (small MOSFET) | Enables Adaptive Power mode at light loads; open = Burst Mode fallback |
| BG | Bottom-gate driver | Drives synchronous N-MOSFET; swing = 0V to INTVCC |
| VOSENSE | Remote output voltage sense | Connects to output or external divider; referenced to 1.19V internal bandgap |
| VPROG | Output voltage select | Open = adjustable; 0V = 3.3V; INTVCC = 5V - no external resistors needed for common rails |
| RUN/SS | Enable + soft-start control | <1.3V = shutdown; capacitor to ground sets ramp time (~0.5s/µF) |
| SENSE+ | Current-sense positive input | Paired with SENSE– to monitor RSENSE voltage drop for cycle-by-cycle current limiting |
| PLLIN | External sync input | 50kΩ internal pull-down; accepts TTL/CMOS clock for PLL locking or frequency shift |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ gate drive | Automatically switches between TGL/BG (high-current) and TGS-only (low-current) to maintain fixed frequency down to ~1% load - eliminates burst-mode EMI |
| Programmable fixed-frequency PLL | Locks oscillator to external clock (PLLIN) or shifts frequency 30% via PLL LPF voltage (0–2.4V) - enables noise-sensitive multi-rail synchronization |
| Integrated auxiliary linear regulator | Controls external PNP for 0.5A low-noise 12V or user-defined outputs; AUXON enables logic-controlled shutdown |
| Low-battery detection | Dedicated comparator (LBI/LBO) with 1.19V threshold and 20mV hysteresis - provides reliable brown-out signaling without software overhead |
| Power-on reset timer | Generates 65536-cycle delay (~300ms at 125kHz) after VOUT reaches ±5% - ensures stable power sequencing for microcontrollers |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Dual-rail CPU core/I/O supply in notebook or palmtop computers with dynamic load steps. IC Role / Device Role / Timing Role: Primary buck controller delivering 1.2V/5A core voltage and 3.3V/0.5A I/O rail via auxiliary LDO. Use Value: Adaptive Power mode maintains 125kHz switching during light-load sleep states, avoiding audible noise and EMI spikes from burst mode. | Use Scenario: Precision data acquisition system powered by Li-ion battery with tight ripple and dropout requirements. IC Role / Device Role / Timing Role: Main DC-DC converter regulating 3.3V analog supply; SFB pin forces continuous conduction for stable ADC reference. Use Value: 150mV current-sense threshold and 300ns min-on-time enable accurate current limiting and high VIN/VOUT ratios (e.g., 12V→3.3V @ 1MHz). |
| Wireless Modem Power | Industrial DC Distribution |
Use Scenario: Cellular baseband processor supply subject to rapid RF transmit current surges. IC Role / Device Role / Timing Role: High-efficiency buck controller with remote sensing (VOSENSE) and fast transient response. Use Value: 99% duty cycle operation sustains regulation during battery sag (e.g., 3.4V input → 3.3V output), preventing modem reset. | Use Scenario: DIN-rail mounted sensor node requiring robust 5V rail from 24V industrial bus. IC Role / Device Role / Timing Role: Primary step-down controller with EXTVCC connected to VOUT for improved efficiency and thermal performance. Use Value: EXTVCC switchover at 4.7V reduces INTVCC regulator losses, lowering junction temperature by up to 15°C vs. internal LDO only. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855EUF#PBF | Single-output, no auxiliary LDO; supports 4–38V input; 850kHz max fSW; requires external VREF | Lacks integrated low-noise 0.5A linear regulator and low-battery comparator | Choose for higher-frequency, higher-efficiency designs where auxiliary rail is generated separately |
| MP2451DT-LF-Z | Fixed 3.3V/5V output; no PLL sync; no TGS adaptive drive; 2A max output; 3mm × 3mm QFN | Not pin-compatible; lacks remote sense, programmable soft-start, and SFB feedback | Choose for cost-sensitive, space-constrained applications with fixed output and no light-load noise constraints |
Compared with LTC3855EUF#PBF and MP2451DT-LF-Z, the LTC1436ACGN#TRPBF uniquely combines adaptive gate drive for constant-frequency light-load operation, integrated auxiliary LDO control, and full-feature monitoring (LBO, POR, SFB) in a proven 24-SSOP package - making it optimal for portable systems demanding low EMI, battery longevity, and multi-rail integration.
Availability
LTC1436ACGN#TRPBF is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, wireless modems, and industrial DC distribution systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1436ACGN#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 its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC1436A series was designed as a feature-rich synchronous buck controller for portable and battery-critical applications - emphasizing adaptive efficiency, low-noise operation, and integrated system monitors (POR, LBO, soft-start) without external components.
FAQ
What is the maximum input voltage rating for the LTC1436ACGN#TRPBF?
The LTC1436ACGN#TRPBF 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 risks permanent damage to internal circuitry, including the INTVCC regulator and gate drivers. Always use appropriate input transient suppression when operating near this limit.
How does the Adaptive Power™ mode function in the LTC1436ACGN#TRPBF?
The LTC1436ACGN#TRPBF activates Adaptive Power™ mode automatically when load current drops below ~1% of full scale: it disables BG and routes top-gate drive to TGS instead of TGL, engaging a smaller external MOSFET. This maintains fixed-frequency operation without burst-mode switching noise. If TGS is left unconnected, the device defaults to standard Burst Mode operation.
Can the LTC1436ACGN#TRPBF generate a 12V auxiliary output?
Yes - the LTC1436ACGN#TRPBF's auxiliary regulator block can deliver up to 0.5A at 12V using an external PNP pass transistor (e.g., 2N2907A). When AUXDR voltage exceeds 9.5V, the IC internally connects a precision 12V resistive divider to AUXFB, eliminating need for external feedback resistors. AUXON enables logic-controlled on/off control.
What is the purpose of the SFB pin on the LTC1436ACGN#TRPBF?
The SFB (Secondary Feedback) pin on the LTC1436ACGN#TRPBF forces continuous conduction mode regardless of main output loading. When tied to ground, it guarantees regulation stability in flyback-derived auxiliary supplies. When connected to a resistive divider from a transformer secondary winding, it enables precise cross-regulation of isolated outputs - critical in multi-output AC/DC adapters.
Does the LTC1436ACGN#TRPBF support external frequency synchronization?
Yes - the LTC1436ACGN#TRPBF supports external synchronization via the PLLIN pin. When driven with a clean CMOS/TTL clock, the internal phase-locked loop locks the oscillator to the external source. The PLL LPF pin serves as both phase detector output and oscillator control input, allowing frequency shifting from 112kHz to 240kHz with a 0–2.4V analog signal.
LTC1436ACGN#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC1436ACGN#TRPBF FAQ
1.How can I place an order for LTC1436ACGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1436ACGN#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 LTC1436ACGN#TRPBF reliable?
The price and inventory of LTC1436ACGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1436ACGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1436ACGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1436ACGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1436ACGN#TRPBF?
LTC1436ACGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1436ACGN#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 LTC1436ACGN#TRPBF?
For technical support, including LTC1436ACGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1436ACGN#TRPBF requirements.
6.How does Aetrix verify that LTC1436ACGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1436ACGN#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 LTC1436ACGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1436ACGN#TRPBF?
All LTC1436ACGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1436ACGN#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 LTC1436ACGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1436ACGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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